US Pat. No. 9,385,908

COMMUNICATION APPARATUS AND COMMUNICATION METHOD

Icom Incorporated, Osaka...

1. A communication apparatus, comprising:
an inserter that adds an element having a value of 0 into predetermined positions of a modulated signal to generate inserted
data including all of the elements of the modulated signal, the number of elements of the inserted data being equal to a size
of Fast Fourier Transformation (FFT);

an operator that adds a pilot signal to the inserted data to generate post-operation data, in which the pilot singal comprises
a data series of which the number of elements is equal to the size of FFT and of which the elements at the positions corresponding
to the predetermined positions are multiplied by a first amplitude coefficient and the elements other than the elements multiplied
by the first amplitude coefficient are multiplied by a second amplitude coefficient having a value different from the first
amplitude coefficient;

an IFFT unit that performs an Inverse Fast Fourier Transformation (IFFT) on the post-operation data; and
a transmitter that generates a baseband signal based on the post-operation data on which the IFFT is performed and transmits
a transmission signal generated from the baseband signal,

wherein the positions at which the elements are inserted are determined in advance and the position information is shared
between the transmission side and reception side; and

wherein the first amplitude coefficient is greater than the second amplitude coefficient and the difference between the first
and second amplitude coefficients is equal to or less than a threshold.

US Pat. No. 9,166,672

WIRELESS COMMUNICATION SYSTEM, RELAY SYSTEM, REPEATER DEVICES AND SYNCHRONIZATION METHOD

ICOM INCORPORATED, Osaka...

1. A wireless communication system comprising:
a relay system comprising a plurality of relay devices which are connected to one another via a system bus, wherein a unique
relaying channel is allocated to each of the plurality of relay devices;

a plurality of wireless terminal devices which communicate with each other via the relay system, and each of the plurality
of wireless terminal devices being registered to one of the plurality of relay devices;

wherein each of the plurality of relay devices transmits control information to each of the wireless terminal devices with
which it is registered;

wherein each wireless terminal device receives the control information transmitted from the relay device to which it is registered,
selects a channel which is currently able to relay a communication among the unique relaying channels respectively allocated
to the plurality of relay devices based on the received control information, and communicates with another wireless terminal
device via the selected channel;

wherein each of the plurality of relay devices receives a synchronization signal via the system bus to configure the control
information, and wirelessly transmit a downlink signal to the wireless terminal device to which the relay device is registered;
and

wherein each of the plurality of wireless terminal devices maintains, when shifting a channel for communication to another
channel, a synchronized state with the plurality of relay devices through the system bus and to the plurality of wireless
terminal devices established prior to shifting for at least a predetermined period.

US Pat. No. 9,699,235

RELAYING DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

Icom Incorporated, Osaka...

1. A communication system, comprising:
two relaying devices (2) that are first and second relaying devices, being connected through a network, each of which having its IP address to be
identified on the network;

two repeaters (3) that are first and second repeaters, each of which being connected to one of the relaying device with a wire;

two transceivers (4) that are first and second transceivers, each of which being wirelessly connected to one of the repeaters and is able to
make a connection with the repeater only within a limited area that is ranged by the repeater, a coding scheme for the first
transceiver (4A) being independent from that for the second transceiver (4B),

the first transceiver, the first repeater, and the first relaying device being aligned on one side of the network, and the
second transceiver, the second repeater, and the second relaying device being aligned on the other side of the network, wherein

when the first transceiver designates the second transceiver as a destination by an operation of a user and creates an audio
signal from a voice of the user, destination information that is created based on the destination and the audio signal are
sent to the first repeater,

the first repeater transfers the destination information and the audio signal to the first relaying device,
the first relaying device is provided with a first destination management table (202) in which an identification information and an IP address of the second relaying device are mutually assigned and stored,

when the first relaying device receives the destination information and the audio signal from the first repeater, the first
relaying device

refers to the first destination management table,
determines the IP address of the second relaying device based on the destination information,
encodes the audio signal in a predetermined coding scheme for the second relaying device, and
converts the encoded audio signal and the destination information into packets so that these packets run through the network,
transmits these packets with the IP address to the network,
when these packets are delivered to the second relaying device, the second relaying device receives these packets after confirming
that the IP address matches its IP address,

the second relaying device, which is provided with a second destination management table (202) in which the coding scheme for the second transceiver is stored,

refers to the second destination management table,
determines the coding scheme for the second transceiver based on the destination information,
re-converts these packets into an audio signal that maintains the destination information,
encodes the audio signal in the coding scheme for the second transceiver, and
transmits the audio signal and the destination information to the second repeater,
the second repeater transfers the audio signal and the destination information to the second transceiver.

US Pat. No. 9,161,173

RADIO COMMUNICATION SYSTEM, LOCATION REGISTRATION METHOD, REPEATER, AND RADIO CLIENT DEVICE

ICOM INCORPORATED, Osaka...

1. A radio communication system comprising:
a plurality of repeaters connected to each other via communication lines, each allocated with a unique channel; and
a plurality of radio client devices that communicate with each other via at least one of the plurality of repeaters;
wherein a plurality of communication areas are formed in which each of the plurality of radio client devices is capable of
receiving a signal transmitted by multiple repeaters from among the plurality of repeaters in each communication area,

in each communication area, at least one predetermined repeater transmits a usage condition signal in a case where a channel
allocated to the predetermined repeater is usable for communication,

each of the plurality of radio client devices scans a channel allocated to the predetermined repeater, and transmits a request
for location registration to the predetermined repeater in a case of detecting the usage condition signal, and

the repeater, in a case of receiving a request for location registration from one of the plurality of radio client devices,
conducts location registration for the radio client device, transmits information about the radio client device whose location
is registered to a predetermined repeater in a communication area of the repeater or to a predetermined repeater in a different
communication area, and in a case of receiving information about a radio client device whose location is registered from another
repeater in the communication area of the repeater, transmits information about the radio client device whose location is
registered to the predetermined repeater in the different communication area.

US Pat. No. 9,461,605

ELECTRONIC DEVICE

Icom Incorporated, Osaka...

1. An electronic device, comprising:
a speaker:
an amplifier for driving the speaker;
a speaker grill provided on the front surface of the speaker;
a water submersion detection unit for detecting that the electronic device has dropped onto water surface or, into water (hereinafter,
referred to as “water submersion”) and detecting that the electronic device has been picked up from the water surface or from
the water (hereinafter, referred to as “pickup”);

a sound signal generation unit for generating a water discharge sound signal for discharging water having entered inside the
speaker grill according to the detection of the pickup and inputting the generated water discharge sound signal to the amplifier;

a power supply circuit for setting the sound signal generation unit
in a power-on state when the water submersion is detected, and
in a power-off state when the water discharge sound signal that is started generating according to the detection of the pickup
is stopped, and

an OR circuit that makes the power supply circuit keep the sound signal generation unit in the power-off state when the water
discharge sound is stopped in the case that the sound signal generation unit has been set in the power-off state since before
the water submersion is detected.

US Pat. No. 9,374,472

RELAYING DEVICE

Icom Incorporated, Osaka...

1. A relaying device comprising:
a wireless device interface to which a relaying wireless device is connected, wherein the relaying wireless device communicates
with more than one wireless terminal devices;

a network interface connected to a data communication network and receiving a communication request and wireless-device specifying
information for specifying one of the wireless terminal devices from a partner device connected to the data communication
network; and

a control unit connected to the wireless device interface and the network interface, wherein
the control unit determines whether or not the communication request is accompanied by the wireless-device specifying information,
when receiving the communication request,

when the communication request is not accompanied by the wireless-device specifying information, the control unit sends a
signal prompting an input of the wireless-device specifying information to the partner device, and after the partner device
sends the wireless-device specifying information in response to the signal, the control unit instructs the relaying wireless
device to call the wireless terminal device specified by the wireless-device specifying information,

when the communication request is accompanied by the wireless-device specifying information, the control unit instructs the
relaying wireless device to call the wireless terminal device specified by the wireless-device specifying information,

the communication request is an INVITE message of SIP protocol, and
the wireless-device specifying information is embedded into a TO header.

US Pat. No. 9,369,324

COMMUNICATION APPARATUS AND COMMUNICATION METHOD

ICOM Incorporated, Osaka...

1. A communication apparatus, comprising:
a modulator that modulates an input signal to generate a modulated signal;
an inserter that adds all elements of a predetermined redundant signal at a predetermined position of the modulated signal
and generates inserted data including all the elements of the modulated signal modulated by the modulator, of which a sum
of all elements of the modulated signal and all the added elements of the redundant signal is equal to a size of Fast Fourier
Transformation (FFT);

a determiner that calculates Peak-to-Average Power Ratio (PAPR) of a baseband signal corresponding to the inserted data, and
determines whether the PAPR satisfies a predetermined reference; and

a transmitter that transmits a transmission signal corresponding to the baseband signal when the determiner determines that
the reference is satisfied; wherein:

the inserter shifts all the elements of the redundant signal a predetermined number of times in a predetermined direction
while maintaining the positional relationship of each element and adds all the elements of the shifted redundant signal at
the predetermined position of the modulated signal when the determiner determines that the PAPR does not satisfy with the
predetermined reference, to generate new inserted data.

US Pat. No. 9,098,992

ELECTRONIC APPARATUS

Icom Incorporated, Osaka...

1. An electronic apparatus comprising:
an enclosure that is a casing;
submergence detector for detecting submergence of the electronic apparatus including a situation where the electronic apparatus
has been dropped and stays afloat on the water surface and a situation where the electronic apparatus has been dropped and
stays underwater as well as a situation where the electronic apparatus has been retrieved from the water;

a light-emitting device that emits light;
an illumination circuit for lighting the light-emitting device when an illumination signal is input;
a controller for making the light-emitting device blink by generating the illumination signal at prescribed blinking intervals
at least during a period from a point of submergence to a point of retrieval of the electronic apparatus and inputting the
illumination signal to the illumination circuit;

a battery that supplies electric power, and
a power control circuit for activating the controller by supplying the electric power thereto from the battery when the submergence
detector detects submergence, wherein

the submergence detector, the light-emitting device, the illumination circuit, the controller, the battery and the power controller
circuit are equipped with the enclosure.

US Pat. No. 9,705,954

RELAYING DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

Icom Incorporated, Osaka...

1. A relaying device that connects two different audio communication systems, one of the systems being a transceiver system
in which one transceiver wirelessly exchanges an audio signal with another transceiver via radio waves, and the other of the
systems being a network communication system exchanging the audio signal through the network, the relaying device comprising:
a wireless device interface that
is connected to a repeater of the transceiver system, and
receives/transmits a first-form packet containing the audio signal to which a calling information specifying a communication
partner is added from/to the transceiver through the repeater;

a network interface that
is connected to the network, and
receives/transmits a second-form packet containing the audio signal and the calling information from/to a network device connected
to the network;

a destination management table in which the calling information and addresses, which are unique codes to identify the network
devices placed on the network, are stored, each piece of the calling information being assigned to one of the addresses, and

a control unit that converts the first-form packet and the second-form packet, wherein
the control unit comprises a uplink packet processing unit and a downlink packet processing unit
the uplink packet processing unit, when the first-form packet is input from the wireless device interface,
determines one of the addresses as a determined address identifying one of the network devices by referring to the destination
management table with the calling information added to the first-form packet,

generates the second-form packet by adding the determined address and containing the audio signal contained in the first-form
packet and the calling information added to the first-form packet as a payload, and

inputs the second-form packet into the network interface, and
the downlink packet processing unit, when the second-form packet is input from the network interface,
generates the first-form packet by containing the audio signal contained in the second form packet and adding the calling
information contained in the second-form packet and deleting the address added to the second-form packet, and

inputs the first-form packet into the wireless device interface.

US Pat. No. 9,160,588

RADIO RECEIVER AND FREQUENCY CORRECTING METHOD THEREFOR

ICOM Incorporated, Osaka...

1. A radio receiver using a modulation scheme in which a frequency shift from a radio transmitter appears as a DC offset in
a demodulated signal, comprising:
a synchronization word pattern detection circuit obtaining the DC offset from a difference between a direct current value
of a predetermined number of symbol patterns of the demodulated signal and a known direct current value of symbol patterns
of a synchronization signal;

a first DC offset correcting circuit adjusting the value of the DC offset output from the synchronization word pattern detection
circuit;

a symbol recovery circuit that performs high-speed pull-in processing by subtracting, from the demodulated signal, the value
of the DC offset adjusted by the first DC offset correcting circuit to output a corrected demodulated signal;

a second DC offset correcting circuit obtaining a residual DC offset from an average value of the corrected demodulated signal
output from the symbol recovery circuit; and

a local oscillator that performs low-speed pull-in processing by correcting an oscillation frequency based on the residual
DC offset obtained by the second DC offset correcting circuit;

wherein, after starting the high-speed pull-in processing, the first DC offset correcting circuit reduces the DC offset output
from the synchronization word pattern detection circuit, over time in each predetermined period of time.

US Pat. No. 9,083,591

COMMUNICATION APPARATUS AND COMMUNICATION METHOD

ICOM INCORPORATED, Osaka...

1. A communication apparatus for communicating with another apparatus in orthogonal frequency-division multiplexing wireless
communication, the communication apparatus comprising:
a modulator that modulates an input signal using a predetermined modulation scheme, and assigns the modulated input signal
to subcarriers with frequency components orthogonal to each other, thereby generating a subcarrier modulation signal;

an inserter that inserts a transmission-side data series in a signal for synthesis in such a way that elements in the signal
for synthesis and elements in the transmission-side data series are alternately positioned, thereby generating first data,
the signal for synthesis being generated by multiplying the subcarrier modulation signal by a predetermined signal amplitude
coefficient, the transmission-side data series being generated by multiplying a data series which is a set of data whose quantity
is equal to a number of the subcarriers and which has an autocorrelation property such that an autocorrelation value with
a data series whose data has not been shifted is higher than an autocorrelation value with a data series whose data has been
shifted by a predetermined series amplitude coefficient;

a first transformer that performs an inverse fast Fourier transformation on the first data;
a separator that separates an operation result from the first transformer into first half data and second half data having
elements equal in quantity to elements of the first half data, and generates a baseband signal based on the first half data
or the second half data; and

a transmitter that generates a transmission signal from the baseband signal.

US Pat. No. 9,112,757

COMMUNICATION DEVICE AND COMMUNICATION METHOD

ICOM INCORPORATED, Osaka...

1. A communication device that communicates with another device in orthogonal frequency-division multiplexing wireless communication,
comprising:
an identification provider that provides predetermined identification data to an input signal, and generates a first signal;
a differential encoder that performs a differential encoding of a data series, that is an aggregate of data having a matching
number of elements to that contained in the first signal, and generates a second signal;

a modulator that modulates each of the first signal and the second signal using a primary modulation, and generates first
modulated data and second modulated data;

an IFFT calculator that performs an inverse fast Fourier transformation on each of the first modulated data and the second
modulated data, and generates first inverse transformed data and second inverse transformed data;

a selector that compares a peak-to-average power ratio calculated by a baseband signal associated with the first inverse transformed
data and a peak-to-average power ratio calculated by a baseband signal associated with the second inverse transformed data,
and selects a baseband signal having a lower peak-to-average power ratio; and

a transmitter that generates a transmission signal based on the selected baseband signal, and transmits the transmission signal.

US Pat. No. 9,112,574

RELAYING DEVICE AND COMMUNICATION SYSTEM

Icom Incorporated, Osaka...

1. A relaying device for wireless communication, the relaying device comprising:
a transceiver interface connected to a transceiver which receives an audio signal from a wireless handset and transfers the
audio signal to a signal processor;

wherein the signal processor is connected to the transceiver interface;
a network interface connected to a network which acts as a data communication network for sending or receiving packets to
or from other network devices connected to the network; and

a packet processor connected to the network interface;
wherein the signal processor outputs the audio signal inputted from the transceiver interface to the packet processor as an
uplink audio signal, and the signal processor outputs a downlink audio signal inputted from the packet processor to the transceiver
interface;

wherein the packet processor reads a second audio signal contained within a second audio packet inputted from the network
interface and outputs the second audio signal to the signal processor as the downlink audio signal, and the packet processor
creates a first audio packet from the uplink audio signal and outputs the first audio packet to the network interface;

wherein the relaying devices communicates to a plurality of devices through a plurality of communication paths, including
paths stemming from the transceiver interface, the signal processor, and the packet processor, and

each communication path including a mixer that additively synthesizes a first uplink audio signal and a downlink audio signal
of other communication paths to the own uplink audio signal and inputs the synthesized signal to the packet processor, and
additively synthesizes a second uplink audio signal and a downlink audio signal of other communication paths to the own downlink
audio signal and inputs the synthesized signal to the signal processor,

the signal processor outputs an uplink audio detection signal to the packet processor in parallel with outputting of the uplink
audio signal,

the packet processor outputs a downlink audio detection signal to the signal processing unit in parallel with outputting of
the downlink audio signal, and

the mixer inputs to the packet processor a signal generated by ORing an uplink audio detection signal of other communication
paths and a downlink audio detection signal of other communication paths to the uplink audio detection signal of the current
path, and

the mixer inputs a signal generated by ORing an uplink audio detection signal and a downlink audio detection signal of other
communication paths to the downlink audio detection signal of other communication paths.

US Pat. No. 9,705,543

COMMUNICATION SYSTEM, FREQUENCY CONTROL METHOD, REMOTE TERMINAL AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM HAVING STORED THEREIN PROGRAM

ICOM Incorporated, Osaka...

1. A communication system comprising a wireless device and a remote terminal connected to the wireless device via a communication
network, and including a tuning mode for a tuning operation, wherein:
the wireless device comprises:
a frequency converter to perform, on a basis of a wireless-device-end local frequency, a frequency conversion on a reception
signal on a basis of a radio wave captured by an antenna, and output an intermediate frequency (IF) signal;

a wireless-device-end demodulator to demodulate the IF signal, and output a wireless-device-end audio frequency (wireless-device-end
AF) signal that is the demodulated signal;

a wireless-device-end communicator to transmit the IF signal and the wireless-device-end AF signal to the remote terminal,
and exchange a control signal with the remote terminal; and

a wireless-device-end controller to adjust the wireless-device-end local frequency,
the remote terminal comprises:
an instruction obtainer to obtain an adjustment instruction of a reception frequency;
a remote-end communicator to receive the IF signal and the wireless-device-end AF signal from the wireless device, and exchange
a control signal with the wireless device;

a remote-end demodulator to demodulate the received IF signal on a basis of a remote-end local frequency, and output a remote-end
audio frequency (remote-end AF) signal that is the demodulated signal;

a remote-end controller to adjust the remote-end local frequency in accordance with the adjustment instruction obtained by
the instruction obtainer in the tuning mode; and

an outputter to output the remote-end AF signal output by the remote-end demodulator in the tuning mode, and output the wireless-device-end
AF signal received by the remote-end communicator in a mode other than the tuning mode,

wherein:
the remote-end communicator is to transmit the control signal representing the last adjustment instruction at an end of the
tuning mode, and

when the wireless-device-end communicator receives the control signal representing the last adjustment instruction, the wireless-device-end
controller is to adjust the wireless-device-end local frequency in accordance with the last adjustment instruction.

US Pat. No. 9,083,431

COMMUNICATION APPARATUS AND COMMUNICATION METHOD

ICOM INCORPORATED, Osaka...

1. A communication apparatus for communicating with another apparatus in orthogonal frequency-division multiplexing wireless
communication, the communication apparatus comprising:
a modulator for modulating an input signal using a predetermined modulation scheme, and assigns the modulated input signal
to subcarriers with frequency components orthogonal to each other, thereby generating a subcarrier modulation signal;

a controller configured to start processes of:
performing an inverse fast Fourier transformation on the subcarrier modulation signal to generate first data;
decomposing the first data into real data which is a real part of the first data, and imaginary data which is an imaginary
part of the first data;

using a predetermined positive threshold value greater than a maximum value of elements in an input data series which is the
real data or the imaginary data, and a predetermined negative threshold value equal to or less than a minimum value of the
elements in the input data series, or

using a predetermined positive threshold value equal to or greater than the maximum value of the elements in the input data
series, and a predetermined negative threshold value less than the minimum value of the elements in the input data series,

generating positive data having a positive element whose value is less as a value of the element in the input data series
is greater by subtracting from the positive threshold value a value of each element whose value is greater than a predetermined
boundary value and by setting to 0 a value of each element whose value is equal to or less than the predetermined boundary
value in the elements of the input data series, and negative data having a negative element whose value is less as a value
of the element in the input data series is greater by subtracting from the negative threshold value a value of each element
whose value is equal to or less than the predetermined boundary value and by setting to 0 a value of each element whose value
is greater than the predetermined boundary value in the elements of the input data series, or

generating positive data having a positive element whose value is less as a value of the element in the input data series
is greater by subtracting from the positive threshold value a value of each element whose value is equal to or greater than
the predetermined boundary value and by setting to 0 a value of each element whose value is less than the predetermined boundary
value in the elements of the input data series, and negative data having a negative element shows value is less as a value
of the element in the input data series is greater by subtracting from the negative threshold value a value of each element
whose value is less than the predetermined boundary value and by setting to 0 a value of each element whose value is equal
to or greater than the predetermined boundary value in the elements of the input data series;

processing each of the real data and the imaginary data being the input data series, adding the positive data and the negative
data which are generated based on the real data to generate real operation data, and adding the positive data and the negative
data which are generated based on the imaginary data to generate imaginary operation data;

synthesizing the real operation data and the imaginary operation data to generate a baseband signal; and
a transmitter for generating a transmission signal from the baseband signal.

US Pat. No. 9,503,910

RELAYING DEVICE

Icom Incorporated, Osaka...

1. A relaying device for establishing a communication between one repeater and one of other relaying devices, the repeater
connected to the relaying device with a cable and wirelessly communicating an audio signal with one or multiple transceivers
in a half-duplex format, the other relaying devices, which are identical to the relaying device and wirelessly communicate
with one or multiple transceivers, connected to the relaying device via a network and communicating RTP packets containing
the audio signal, comprising:
a network interface connected to the network, and receiving/transmitting the RTP packets from/to the another relaying device
via the network;

a wireless interface connected to the repeater, and receiving/transmitting the audio signal from/to the repeater via the cable;
a voice buffer buffering the audio signal; and
a control unit detecting a leading packet of the RTP packets and the audio signal from the repeater and having a destination
management table that is configured with multiple transceiver IDs and IP addresses of the other relaying devices corresponding
to each other, the transceiver IDs being information to be used to determine which one is a designated transceiver among the
transceivers and the IP addresses of the other relaying devices being information to be used to determine which one is a designated
relaying device among the relaying devices, wherein

when receiving and detecting the leading packet of the RTP packets via the network, the control unit
makes the buffer start buffering the audio signal taken from the RTP packets following the leading packet,
detects the designated transceiver by analyzing the RTP packets, and
sends a message to the repeater in order to reserve a wireless communication channel to the designated transceiver, and
after receiving, from the repeater, a reply indicating that the wireless communication channel has been reserved, the control
unit reads out the buffered audio signal from the voice buffer and transmits the audio signal to the repeater so as to be
transmitted wirelessly to the transceiver, and

when receiving and detecting the audio signal that is transmitted from the repeater, the control unit
adds one of the transceiver IDs and one of IP addresses to the audio signal so that the designated transceiver and the designated
relaying device are determined, and

transmits the audio signal to the designated relaying device without reserving a wireless communication channel.

US Pat. No. 9,479,376

COMMUNICATION APPARATUS AND COMMUNICATION METHOD

ICOM INCORPORATED, Osaka...

1. A communication apparatus for communicating with another apparatus in orthogonal frequency-division multiplexing wireless
communication, the communication apparatus comprising:
a modulator that modulates an input signal by a predetermined modulation scheme, and assigns the modulated input signal to
subcarriers with frequency components orthogonal to each other, thereby generating a subcarrier modulation signal;

a first transformer that performs an inverse fast Fourier transformation on the subcarrier modulation signal to generate first
data;

a shifter that shifts a predetermined data series which is a set of data in a predetermined direction by a predetermined number
of times to generate a shift sequence, the predetermined data series having an autocorrelation property such that an autocorrelation
value of the predetermined data series with a data series whose data has not been shifted is higher than an autocorrelation
value of the predetermined data series with a data series whose data has been shifted;

a second transformer that performs an inverse fast Fourier transformation on the shift sequence to generate second data;
a calculator that respectively generates baseband signals from the first data and data obtained by adding the second data
to the first data and data obtained by subtracting the second data from the first data, and calculates a PAPR (Peak-to-Average
Power Ratio) of each of the baseband signals;

wherein processes of the shifter, the second transformer, and the calculator are repeated with the predetermined number of
times to shift the predetermined data series being changed, until detection of a baseband signal whose PAPR matches with a
predetermined reference, or until completion of one cycle of shifting of the data in the predetermined data series, and

wherein the communication apparatus further comprises a transmitter that generates a transmission signal from that of the
generated baseband signals which matches with a reference for determining the transmission signal, and transmits the transmission
signal.

US Pat. No. 9,503,908

RELAYING DEVICE

Icom Incorporated, Osaka...

1. A relaying device that establishes a verbal communication processing between a telephone that is a full-duplex device and
a wireless transceiver, communicating with the telephone through a network, and wirelessly communicating with the transceiver
through a repeater that is a half-duplex device connected to the relaying device, wherein an audio signal stream toward the
telephone from the transceiver is defined as an upstream signal and an opposite signal stream, which is from the telephone
to the transceiver, is defined as a downstream signal, comprising:
an uplink interface that receives the downstream signal from the telephone through the network without a prior notice, and
send the upstream signal to the telephone regardless of whether or not the downstream signal is received;

a wireless apparatus interface that receives the upstream signal from the repeater while PTT of the repeater is off-state
and sends the downstream signal received from the telephone to the repeater while the upstream signal is not received;

a control unit that controls the audio signals during the verbal communication processing; and
a storage unit that stores a reception transceiver number conversion table that includes a wireless transceiver ID associated
with wireless transceiver identification information, wherein

the control unit includes a voice buffer that buffers the downstream signal received from the telephone,
when the wireless transceiver ID is received from the telephone, the controller coverts the received wireless transceiver
ID into the wireless transceiver identification information of a destination wireless transceiver by referring to the reception
transceiver number conversion table stored in the storage unit,

the control unit performs a VOX processing of detecting whether or not a level of the downstream signal is equal to or higher
than a preset threshold,

when the level of the downstream signal is equal to or higher than the threshold, the control unit starts buffering the downstream
signal in the voice buffer and requesting the repeater to reserve a wireless communication channel, and

after receiving, from the repeater, a reply indicating that a wireless communication channel has been reserved, the control
unit reads the downstream signal, which is buffered, from the voice buffer and transfers the downstream signal to the repeater.

US Pat. No. 9,786,135

RADIO APPARATUS

ICOM INCORPORATED, Osaka...

1. A radio apparatus comprising:
a control unit configured to generate a distress signal including at least an ID code and position information of the radio
apparatus;

a power unit configured to supply power to an entire of the radio apparatus;
a distress key to be manipulated for transmission of the distress signal; and
a transmission unit configured to send the distress signal,
wherein the distress key is configured to output a distress key manipulation signal to the control unit and the power unit
in response to a manipulation of the distress key,

wherein the power unit is configured to supply power to at least the control unit and the transmission unit in response to
receiving the distress key manipulation signal in a state that a power supply to the entire of the radio apparatus is stopped,

wherein the control unit is configured to start setting up the radio apparatus and to count a time during which the control
unit continues to receive the distress key manipulation signal, in response to receiving power from the power unit, and

wherein the control unit is configured to output a power supply maintenance signal to the power unit, to generate the distress
signal, and to cause the transmission unit to send the distress signal, in response to continuous receiving the distress key
manipulation signal for a preset time or longer.

US Pat. No. 9,719,890

MICRO-SAMPLING FOR AQUATIC CHEMICAL ANALYSIS

BIOMICOM INCORPORATED, A...

1. An aquatic sampling and analysis system for observing a marine species comprising:
an ecosystem comprising an in vitro ecosystem or an in vivo ecosystem; and
a sampling and analysis arrangement comprising:
a plurality of probes for collecting a sample directly from the marine species or from an environment near the marine species;
a pump in fluid communication with the probes to initiate collection of the sample from one of the probes; and
an analyzer in fluid communication with the pump to analyze the sample using chemical measurements,
wherein the sampling and analysis arrangement is configured to take simultaneous samples from probes at different spatial
locations.

US Pat. No. 9,705,585

RELAYING DEVICE AND COMMUNICATION SYSTEM

Icom Incorporated, Osaka...

1. A relaying device establishing a communication between an IP phone that is one of IP phones connected to a network and
a transceiver that is one of radio transceivers making a wireless communication through a repeater,
the transceiver
wirelessly transmitting an audio signal,
making an individual communication with another transceiver using a destination ID, which is defined as data to identify the
another transceiver,

storing a plurality of the destination IDs, and transmitting one of the destination IDs selected by a user in the wireless
communication to the relaying device,

the relaying device being provided with a wireless apparatus interface (21) connected to the repeater, a network interface (22) connected to the network, and a control unit (20),

the control unit converting the audio signal, which is transmitted from the transceiver and is input from the wireless apparatus
interface, into packets in order to transmit through the network, and forwarding the packets to the network through the network
interface, further converting the audio signal, which is transmitted from the IP phone and is input from the network interface,
into an audio signal that is in accordance with a regulation of the transceiver, and forwarding the converted audio signal
to the repeater through the wireless apparatus interface,

further the control unit having a destination correspondence table in which the plurality of the destination IDs and a plurality
of SIP addresses of the IP phones are stored, each of the destination IDs being assigned to one of the IP phones, wherein

when receiving the destination ID transmitted from the transceiver, the control unit
refers to the destination correspondence table, reads out one of the SIP addresses that is corresponded to the destination
ID,

transmits an Invite message that is in accordance with SIP protocol to the read SIP address, and makes a call to one of the
IP phones that is destined by the SIP address assigned with the destination ID, and

after receiving a response from the IP phone, the control unit converts audio signals from both sides, forwards them from
one side to the other side.

US Pat. No. 9,577,719

WIRELESS DEVICE AND NEAR-FIELD WIRELESS COMMUNICATION METHOD

ICOM INCORPORATED, Osaka...

1. A wireless device, comprising a near-field wireless communication module for performing near-field wireless communication
with an external communication terminal,
wherein the near-field wireless communication module includes a microcontroller unit and a digital signal processor and the
external communication terminal comprises a PTT switch;

wherein the microcontroller unit comprises nontransitory storage media which implements an HCI firmware layer and an application
layer, the HCI firmware layer controlling a bluetooth module and a host controller interface to configure the wireless device
to perform near-field wireless communication to wirelessly transmit and receive data, and the application layer being a highest
layer of a communication protocol;

wherein in the near-field wireless communication a priority order of processes carried out in the application layer is lower
than a priority order of processes carried out in the HCI firmware layer;

wherein the microcontroller unit further includes a UART controller and an SPP controller;
wherein the UART controller controls a universal asynchronous receiver transmitter that transmits a wireless serial communication
command for transmission-reception switching control of the wireless device through manipulation of the PTT switch through
the near-field wireless communication;

wherein the SPP controller discriminates whether data processed by the application layer includes a command for Bluetooth
profile for near-field wireless communication or a PTT command, extracts the command for Bluetooth profile or the PTT command
from among the data before the data is processed by the application layer, and transmits the extracted command to the digital
signal processor,

wherein the digital signal processor processes the command transmitted from the SPP controller; and
wherein the SPP controller receives the processed command from the digital signal processor and transfers the processed command
to the application layer.

US Pat. No. 9,584,142

FRACTIONAL N FREQUENCY SYNTHESIZER AND SETTING METHOD THEREOF

Icom Incorporated, Osaka...

1. A fractional N frequency synthesizer, comprising:
a phase frequency comparator comparing a reference frequency with the phase frequency of an input signal and outputting the
difference between the reference frequency and the phase frequency;

a voltage controlled oscillator outputting a clock signal in response to the output of the phase frequency comparator;
a ?? modulator accumulating a fractional set value at each cycle of the reference frequency and generating a carryover signal
when the accumulated value exceeds the maximum value of an accumulator in the ?? modulator;

a frequency divider dividing the frequency of the clock signal from the voltage controlled oscillator by a first frequency
division value when the carryover signal has been generated by the ?? modulator, at each cycle of the reference frequency,
dividing the frequency of the clock signal from the voltage controlled oscillator by a second frequency division value when
the carryover signal has not been generated by the ?? modulator, at each cycle of the reference frequency, the second frequency
division value being different from the first frequency division value, and using the clock signal with the divided frequency
as the input signal to the phase frequency comparator;

a calculator calculating the remainder of the division of which the dividend is the minimum accumulated value at which a carryover
occurs in the ?? modulator and the devisor is the fractional set value, and if the remainder is not zero, repeatedly calculating
the quotient and remainder of the division of which the dividend is the devisor of the previous division and the devisor is
the value of the remainder obtained in the previous division until the value of the remainder becomes zero;

an abnormal noise determiner determining, after the calculator has calculated the quotient and remainder of the division using
a fractional set value to be set in the ?? modulator until the remainder has become zero, that the fractional set value causes
periodic abnormal noise when the calculated quotients include a value exceeding a threshold and determining that the fractional
set value does not cause periodic abnormal noise when the calculated quotients do not include a value exceeding the threshold;
and

a fractional setter, comprising the calculator and the abnormal noise determiner, changing the fractional set value to the
extent that the frequency of the clock signal eventually obtained by the voltage controlled oscillator does not exceed a given
value when the abnormal noise determiner has determined that periodic abnormal noise has occurred, and setting the changed
fractional set value as the fractional set value of the ?? modulator when the abnormal noise determiner has determined that
the changed fractional set value has not caused periodic abnormal noise.

US Pat. No. 9,854,648

ELECTRONIC DEVICE AND METHOD FOR CONTROLLING ELECTRONIC DEVICE

ICOM INCORPORATED, Osaka...

1. An electronic device comprising:
a submersion detector configured to detect submersion of the electronic device and detect retrieval of the electronic device,
wherein the submersion means that the electronic device itself falls onto a surface of water or into water, and the retrieval
means that the electronic device itself is retrieved from the surface of the water or from under the water;

a plurality of illuminants provided inside a casing and arranged such that at least one of the illuminants is visible from
above water when the electronic device is submerged in any submersion orientation;

a lighting circuit configured to light up the at least one of the illuminants in response to an input of a lighting signal;
a controller configured to generate and output the lighting signal to the lighting circuit for a period of time from the submersion
at least until the retrieval so as to light up the at least one of the illuminants; and

an orientation detector configured to detect a submersion orientation of the electronic device,
wherein only the at least one of the illuminants that is visible from above water lights up, in accordance with the submersion
orientation of the electronic device detected by the orientation detector.

US Pat. No. 9,736,622

NEAR-FIELD WIRELESS COMMUNICATION SYSTEM, COMMUNICATION TERMINAL, AND COMMUNICATION METHOD

Icom Incorporated, Osaka...

1. A near-field wireless communication system operable to connect a master terminal to each of at least two slave terminals
to allow mutual communications through near-field wireless communication,
wherein the master terminal comprises a communication controller for identifying a slave terminal from among the at least
two slave terminals to reconnect with after an inter-terminal connection is disrupted;

wherein the communication controller comprises a first table and a second table;
wherein the first table is configured to place a first connection priority on each of the at least two slave terminals according
to a connection order in a direction backward in time, while placing a highest first connection priority on a most recently
connected slave terminal, among said at least two slave terminals, that was connected to said master terminal most recently
before the inter-terminal connection was disrupted;

wherein the second table is configured to place a second connection priority of a first priority rank on a device function
to be reconnected with the highest priority, among device functions of the at least two slave terminals, and to place a second
connection priority being of a lower priority rank than the first priority rank and being numbered in priority order on each
of the other device functions; and

wherein the communication controller is configured to perform steps (i)-(viii) to select a communication destination, after
the inter-terminal connection was disrupted:

(i) a first step of identifying one slave terminal with the first connection priority ranked highest, among the at least two
slave terminals, by referring to the first table;

(ii) a second step of identifying the device function of the identified one slave terminal in the first step by referring
to the second table after the first step;

(iii) a third step of automatically reconnecting to the identified one slave terminal as the communication destination when
the second connection priority of the first priority rank is placed on the identified device function in the second step by
referring to the second table;

(iv) a fourth step of forwarding the connection order when the second connection priority of the first priority rank is not
placed on the identified device function in the second step by referring to the second table;

(v) a fifth step of identifying another slave terminal, among the at least two slave terminals, corresponding to the forwarded
connection order by referring to the first table after the fourth step;

(vi) a sixth step of identifying the device function of the identified another slave terminal in the fifth step by referring
to the second table after the fifth step;

(vii) a seventh step of automatically reconnecting to the another slave terminal as the communication destination when the
device function of the identified another slave terminal in the sixth step is the second connection priority of the first
priority rank in the second table by referring to the second table; and

(viii) an eighth step of repeatedly performing the fourth through seventh steps while forwarding the connection order until
a slave terminal to be reconnected is identified when the device function of the identified another slave terminal in the
sixth step is not the second connection priority of the first priority rank in the second table by referring to the second
table.

US Pat. No. 9,742,483

RELAYING DEVICE

Icom Incorporated, Osaka...

1. A relaying device connecting wireless transceivers for audio communication therebetween through a plurality of relaying
transceivers that are wired to the relaying device, comprising:
a plurality of interfaces, each of the interface connecting to one of the relaying transceivers wherein the one of the relaying
transceivers communicates with the connected wireless transceiver through their employed communication mode, further each
of the interfaces inputting an uplink signal from the connected relaying transceiver and outputting a downlink signal to the
connected relaying transceiver;

a plurality of signal processing units, each of the signal processing units assigned to one of the interfaces, the one being
defined as the assigned interface, and

a plurality of mixers that makes the downlink signal, each of the mixers assigned to one of the signal processing units and
connected to the other signal processing units, the one being defined as the assigned signal processing unit and the other
being defined as remaining signal processing units, wherein

when one of the signal processing units inputs an audio signal for communication from the assigned interface, the one of the
signal processing units generates an audio detection signal,

each of the mixers
mixes uplink signals input from the remaining signal processing units except the uplink signal from the assigned signal processing
unit to make the downlink signal and outputs the downlink signal to the assigned interface through the assigned signal processing
unit, and

calculates an ORed audio detection signal by logical adding the audio detection signals input from the remaining signal processing
units and outputs the ORed audio detection signal to the assigned signal processing unit,

each of the signal processing units outputs a PTT signal to the assigned interface when a value of the ORed audio detection
signal from the mixer to which the signal processing unit is assigned is positive, that is any one of the remaining signal
processing units generates the audio detection signal, the PTT signal causing the relaying transceiver to transmit the audio
signal,

each of the interfaces outputs the PTT signal to the connected relaying transceiver when the PTT signal is input from the
signal processing unit to which the interface is assigned, to cause the relaying transceiver to transmit the downlink signal,

each of the mixers has a ON/OFF switch that is operated by a user, and
when the switch is OFF, the mixer makes the downlink signal only by the signal received from the Internet not mixing the uplink
signals from the remaining signal processing units, and

when the switch is ON, the mixer mixes the uplink signals input from the remaining signal processing units and the signal
received from the Internet to make the downlink signal.

US Pat. No. 9,838,514

RADIO COMMUNICATION SYSTEM, RADIO APPARATUS, RADIO COMMUNICATION METHOD, PACKET GENERATION METHOD, AND METHOD FOR REPRODUCING DATA FROM PACKET

ICOM INCORPORATED, Osaka...

1. A radio communication system including at least two radio apparatuses, each radio apparatus comprising:
a transmission unit configured to generate a packet including: a header part containing data of an identifier identifying
at least a transmission destination radio station and a transmission source radio station; and a data part in which an audio
frame and a data frame, each having a predetermined length, are consecutively arranged one after another, the data frame further
having a mini-header inserted therein, in which information indicating a type of data is written, and to convert the packet
into a radio signal and transmit the radio signal;

a reception unit configured to receive the radio signal, reproduce a packet from the radio signal, and retrieve data from
the packet;

an audio codec configured to generate a digital audio signal by performing A/D conversion and encoding on an analogue audio
signal and thereafter transmit the digital audio signal to the transmission unit, and to reproduce an analogue audio signal
by performing decoding and D/A conversion on a digital audio signal received from the reception unit; and

a controller configured to instruct the transmission unit to generate a packet, and to instruct the reception unit to reproduce
a packet from a received radio signal,

wherein,
when receiving from the controller a first command to start transmission, the transmission unit of a radio apparatus serving
as a sender generates a packet in which data of an audio signal output from the audio codec is inserted in the audio frame
and data for data communication is inserted in the data frame,

when receiving from the controller a second command to change a mode of a packet in response to an end of a call, the transmission
unit of the radio apparatus serving as the sender generates, during a fixed time period from reception of the second command,
a packet in which data for data communication is inserted in the audio frame and the data frame,

the controller of a radio apparatus serving as a recipient, which has received a radio signal, analyzes the information inserted
in the mini-header retrieved from the packet reproduced by the reception unit, to determine the type of data inserted in the
audio frame, and

the reception unit retrieves data from the packet according to a result of the determination made by the controller, and reproduces
the audio signal or the data for data communication.

US Pat. No. 10,256,772

SHIFT CONTROL CIRCUIT AND WIRELESS DEVICE

ICOM INCORPORATED, Osaka...

1. A shift control circuit provided in a wireless device that performs frequency modulation, and outputting an information signal to be applied to the frequency modulation, the shift control circuit comprising:a limiter circuit that limits an amplitude of an input control target signal to be equal to or less than a first threshold;
a phase shifter that shifts, for the control target signal having the amplitude limited by the limiter circuit, a phase of a frequency component within a predetermined frequency range by a predetermined amount; and
a harmonic suppressor that suppresses, for the control target signal phase-shifted by the phase shifter, a frequency component equal to or greater than a second threshold, and outputs the information signal that is the suppressed control target signal.

US Pat. No. 10,033,415

TRANSMITTER AND DISTORTION CORRECTION METHOD

ICOM INCORPORATED, Osaka...

1. A transmitter, comprising:an amplifier to amplify entered signals;
a look-up table to store a distortion correction vector for each transmission electric power address corresponding to electric power of a transmission signal;
a digital pre-distortion processor to correct the transmission signal according to the distortion correction vector stored in the look-up table and to enter the corrected transmission signal into the amplifier;
a data calculator to repeat, based on a delayed transmission signal that is a signal as a result of delaying the transmission signal and a feedback signal that is feedback of the transmission signal amplified by the amplifier, calculation of electric power of the delayed transmission signal, and calculation of a multiplication value of the feedback signal and a complex conjugate of the delayed transmission signal;
a memory to store, for each delayed electric power address corresponding to the electric power of the delayed transmission signal, a first total value that is a total of the repeatedly calculated electric power of the delayed transmission signal and a second total value that is a total of the repeatedly calculated multiplication value;
a range adjuster to adjust an upper limit of a determination reference range according to a maximum reference address that is a maximum value among reference addresses that are the delayed electric power addresses for which the first total value and the second total value are present;
a determiner to determine, when the maximum reference address is equal to or greater than the upper limit of the determination reference range, that a number of repeats of the calculation of the electric power of the delayed transmission signal and the calculation of the multiplication value that are performed by the data calculator is sufficient;
a vector calculator to calculate the distortion correction vector based on a distortion vector calculated from a ratio between the first total value and the second total value in each reference address and to output the distortion correction vector when the determiner determines that the number of repeats is sufficient; and
an updater to update the distortion correction vector stored in the look-up table based on the distortion correction vector output by the vector calculator,
wherein the first total value and the second total value stored in the memory are nullified after completion of processing by the updater.

US Pat. No. 9,917,931

RADIO COMMUNICATION SYSTEM, RADIO APPARATUS, RADIO COMMUNICATION METHOD, PACKET GENERATION METHOD, AND METHOD FOR REPRODUCING DATA FROM PACKET

ICOM INCORPORATED, Osaka...

1. A radio communication system including at least two radio apparatuses,
each radio apparatus is configured to:
generate a packet including a header part containing identifier data identifying at least a transmission destination radio
station and a transmission source radio station; and a data part in which an audio frame and a data frame, each having a predetermined
length, are consecutively arranged one after another, to insert audio signal data into the audio frame of the packet and to
insert data other than the audio signal data into the data frame of the packet, and to thereafter convert the packet into
a radio signal and transmit the radio signal; and

receive the radio signal, to reproduce a packet from the radio signal, to retrieve the audio signal data from the audio frame
of the packet, and to retrieve the data other than the audio signal data from the data frame of the packet; and

each radio apparatus comprising:
an audio codec configured to generate a digital audio signal by performing A/D conversion and encoding on an analogue audio
signal and to reproduce an analogue audio signal by performing decoding and D/A conversion on a digital audio signal; and

a controller configured to instruct the radio apparatus to generate a packet, and to reproduce a packet from a received radio
signal,

wherein, when communication is performed in a fast data mode in which data for data communication to be transmitted, instead
of audio signal data, is inserted in the audio frame,

the radio apparatus serving as a sender generates, according to an instruction from the controller, a packet in which data
for data communication is inserted in the audio frame and the data frame, and information indicating that the data for data
communication is inserted in the audio frame is further inserted in a predetermined position in the data frame, and

the controller serving as a recipient, which has received a radio signal, analyzes the information inserted in the predetermined
position in the data frame of the packet reproduced, to determine that the data for data communication is inserted in the
audio frame, and according to a result of the determination, retrieves data from the audio frame and the data frame of the
packet and reproduces the data for data communication.

US Pat. No. 10,013,863

RADIO APPARATUS

ICOM INCORPORATED, Osaka...

1. A radio apparatus comprising:a detector configured to send a Man-Overboard signal in response to detecting that the radio apparatus has fallen to a water surface or into water;
a controller configured to automatically set a distress type to be Man-Overboard in response to receiving the Man-Overboard signal for a prescribed time or longer;
the controller configured to generate a distress signal including at least the distress type together with identification and position information of the radio apparatus in response to setting of the distress type to Man-Overboard; and
a distress key configured to output a distress key manipulation signal in response to a manipulation of the distress key;
wherein the controller is configured to transmit the distress signal including the distress type Man-Overboard, in response to receiving the distress key manipulation signal continuously for a predetermined time or longer.

US Pat. No. 10,083,579

ELECTRONIC DEVICE AND METHOD FOR CONTROLLING ELECTRONIC DEVICE

ICOM INCORPORATED, Osaka...

1. An electronic device comprising:a submersion detector configured to detect submersion of the electronic device and output a first submersion signal and also configured to detect retrieval of the electronic device and output a second submersion signal, wherein the submersion means that the electronic device itself falls onto a surface of water or into water, and the retrieval means that the electronic device itself is retrieved from the surface of the water or from under the water;
an illuminant provided inside a casing;
a lighting circuit configured to light the illuminant in response to an input of a lighting signal;
a controller configured to light the illuminant by generating and outputting the lighting signal to the lighting circuit at least for a period of time from a point in time when the controller receives the first submersion signal until a point in time when the controller receives the second submersion signal;
an unnecessary part that is unnecessary for lighting the illuminant of the electronic device; and
a power controller,
wherein the electronic device is configured such that,
in a case where the power controller is supplying power to the controller, the lighting circuit, and the unnecessary part when the controller receives the first submersion signal, the controller stops the supply of the power to the unnecessary part at least for the period of time, and
in a case where the power controller is supplying power to neither the controller, the lighting circuit, nor the unnecessary part when the power controller receives the first submersion signal, the power controller supplies power to the controller, and the controller supplied with power receives the first submersion signal, generates the lighting signal and outputs the generated lighting signal to the lighting circuit at least for the period of time, and thereby lights the illuminant, while the controller also continues to maintain the unnecessary part powered off at least for the period of time.

US Pat. No. 9,961,634

RADIO RECEIVER AND MUTE CONTROL METHOD FOR THE SAME

ICOM INCORPORATED, Osaka...

1. A radio receiver, comprising:a signal receiver configured to:
receive a radio signal that carries (i) voice frames that contain voice signal data or data for data communication and (ii) data frames, the voice frames and the data frames having been subjected to time division multiplexing and being repeated one after another according to a predetermined format; and
retrieve and reproduce the voice signal data or the data for data communication from the voice frames;
an audio codec configured to:
perform decompression of the voice signal data reproduced by the signal receiver; and
apply D/A conversion to a digital voice signal that has been obtained from the decompression, thereby obtaining an analogue voice signal; and
a controller configured to instruct the signal receiver to retrieve the voice signal data or the data for data communication from the radio signal,
wherein the controller makes a determination of whether the voice frames are being used for voice signal transmission or data transmission, based on a result of identification of a mini-header that is stored in the data frames,
the controller causes the audio codec to perform a muting operation when a result of the determination successively indicates that the voice frames are being used for data transmission a predetermined first number of times, and
the controller causes the audio codec to cancel the muting operation when the result of the determination successively indicates that the voice frames are being used for voice signal transmission a predetermined second number of times in a situation where the muting operation is being performed.

US Pat. No. 9,955,322

RELAYING DEVICE, AUDIO COMMUNICATION SYSTEM, AND RELAYING METHOD

ICOM INCORPORATED, Osaka...

1. A relaying device comprising:a network communication unit for being connected with a communication network and communicating with a plurality of terminal devices via the communication network;
a storage unit for storing information of the terminal devices; and
a control unit for controlling audio signal communications between the terminal devices, wherein
the control unit sets a plurality of divided systems and makes each of the terminal devices belong to any one of the divided systems,
the plurality of divided systems are commonly controlled by the control unit but do not mutually exchange the audio signal communications with each other,
the control unit uses first identifying information to identify each of the terminal devices, the first identifying information being assigned uniquely to each of the terminal devices in each of the divided systems and being assigned commonly to a terminal device in another divided system,
each of the divided systems is configured with a group to which two or more of the terminal devices belong,
the control unit uses second identifying information to identify each group, the second identifying information being assigned uniquely to the group in each of the divided systems and being assigned commonly to a group in another divided system,
the storage unit stores a terminal table, in which a belonging divided system of each of the terminal devices and the first identifying information of each of the terminal devices in the belonging divided system are described, and a group table, in which each of the divided systems and in which the second identifying information of the group of the belonging divided system and the terminal devices belonging to the group are described,
when an audio signal is received from a calling source terminal device, which is one of the terminal devices, the control unit
determines one of the divided systems, to which the terminal device belongs to, based on calling source terminal device information attached to the received audio signal and the first identifying information, the one of the divided systems being defined as a determined divided system, and
searches the group table of the determined divided system based on the second identifying information to determine another terminal device belonging to the same group as the calling source terminal device, and
the audio signal is forwarded to the another terminal device.

US Pat. No. 9,930,073

RADIO COMMUNICATION SYSTEM, RADIO APPARATUS, RADIO COMMUNICATION METHOD, PACKET GENERATION METHOD, AND METHOD FOR REPRODUCING DATA FROM PACKET

ICOM INCORPORATED, Osaka...

1. A radio communication system including at least two radio apparatuses,each radio apparatus is configured to:
generate a packet including a header part containing identifier data identifying at least a transmission destination radio station and a transmission source radio station; and a data part in which an audio frame and a data frame, each having a predetermined length, are consecutively arranged one after another, to insert audio signal data into the audio frame of the packet and to insert data other than the audio signal data into the data frame of the packet, and to thereafter convert the packet into a radio signal and transmit the radio signal; and
receive the radio signal, to reproduce a packet from the radio signal, to retrieve the audio signal data from the audio frame of the packet, and to retrieve the data other than the audio signal data from the data frame of the packet; and
each radio apparatus comprising:
an audio codec configured to generate a digital audio signal by performing A/D conversion and encoding on an analogue audio signal, and to reproduce an analogue audio signal by performing decoding and D/A conversion on a digital audio signal; and
a controller configured to instruct the radio apparatus to generate a packet, and to reproduce a packet from a received radio signal,
wherein, when communication is performed in a fast data mode in which data for data communication to be transmitted, instead of audio signal data, is inserted in the audio frame,
the radio apparatus serving as a sender generates, according to an instruction from the controller, a packet in which the data for data communication is inserted in positions in the audio frame excluding a given position, and in the data frame, and unique data is inserted in the given position in the audio frame, and
the controller serving as a recipient, which has received a radio signal, instructs the radio apparatus to retrieve data portions other than the unique data from the audio frame and the data frame of the packet, which has been reproduced, and reproduces the data for data communication by concatenating the retrieved data portions.

US Pat. No. 10,091,347

RELAYING DEVICE, AUDIO COMMUNICATION SYSTEM, AND RELAYING METHOD OF AUDIO SIGNAL

ICOM INCORPORATED, Osaka...

1. A relaying device comprising:a network communication unit for communicating with a plurality of terminal devices via a communication network including a wireless network;
a control unit for controlling communication of an audio signal among the terminal devices; and
a storage unit comprising:
a terminal table that stores position information of the terminal devices, the position information indicating where the terminal devices are present in a communication area of the wireless network, and the communication area being established through a plurality of access points, each of these access points having its coverage area within which the terminal devices belonging to one of the coverage areas are able to wirelessly communicate the audio signal to the one of the access points, wherein for each terminal device, the position information includes an identification of an access point connected to that terminal device;
a group table that stores groups to which the terminal devices are assigned to belong, wherein the assignments of the terminal devices to the groups are prepared beforehand; and
an area table that stores a plurality of partial communication areas into which the communication area is divided such that for each of the partial communication areas, wherein the area table includes identifications of one or more of the access points serving that partial communication area,
when a calling terminal device, which is one of the terminal devices, makes a call that designates one of the partial communication areas and one of the groups, the one of the partial communication areas being defined as a designated partial communication area and the one of the groups being defined as a designated group, the control unit
detects one or more of designated terminal devices such that for each designated terminal device, the access point connected to that designated terminal device as indicated in the terminal table is the access point serving the designated partial communication area as indicated in the area table, and that designated terminal device belong to the designated group as indicated in the group table, and
establishes a communication session in which the calling terminal device and the designated terminal devices performs relaying processing to communicate the audio signal between the calling terminal device and the designated terminal devices, the audio signal being transferred to the designated terminal devices but not transferred to other terminal devices.

US Pat. No. 9,973,888

RELAYING DEVICE, VOICE COMMUNICATION SYSTEM, AND VOICE COMMUNICATION METHOD

ICOM INCORPORATED, Osaka...

1. A relaying device comprising a network communication unit, a storage unit, and a control unit for wireless communication between a plurality of terminal devices, the wireless communication being established through a plurality of access points and a communication network, each of these access points having its coverage area within which the terminal devices belonging to one of the coverage areas are able to wirelessly receive a voice signal from and to transmit the voice signal to the one of the access points, one of the access points to which one of the terminal devices belongs being defined as a connected access point with respect to the belonging terminal device, whereinat least two section systems are created such that each of the terminal devices is assigned to one of the section systems, the assigned one of the section systems being defined as an assigned section system,
the network communication unit is connected to the communication network, through which the voice signal is communicated,
the storage unit stores a terminal table in which terminal identification codes for identifying the terminal devices, position information for identifying the connected access points, and section system numbers for identifying the assigned section systems are associated each other, and
when receiving the voice signal and subsidiary information from one terminal device, which is defined as a source terminal device, the subsidiary information including at least a source terminal identification code for identifying the source terminal device and destination position information that identifies one or more connected access points to which the voice signal is to be transmitted, the control unit
determines, by referring to the terminal table
one section system number of the assigned section system to which the source terminal device is assigned based on the source terminal identification code and
one or more connected access points based on the destination position information, the connected access points determined by the control unit being defined as destination access points, and
transmits the voice signal together with the one section system number to the destination access points through the communication network, the voice signal being transmitted to all of the terminal devices that are assigned to the same section system as the source terminal device and belong to the destination access points.

US Pat. No. 10,009,737

RELAYING DEVICE, VOICE COMMUNICATION SYSTEM AND VOICE COMMUNICATION METHOD

ICOM INCORPORATED, Osaka...

1. A relaying device comprising:a network communication unit for communicating with a plurality of terminal devices over a network;
a control unit for controlling the communication with the plurality of terminal devices; and
a storage unit in which a group table is stored, the group table including, as groups of terminal devices that perform communications therebetween, a normal group to which the plurality of terminal devices belong in advance, and a user group to which a terminal device that transmits a registration request belongs, wherein
when the control unit receives registration request information for requesting registration to the user group from one of the plurality of terminal devices, the control unit registers the one of the plurality of terminal devices in the group table so as to belong to the user group,
after two or more terminal devices are registered to belong to the user group, when the control unit receives a voice signal from the one of the plurality of terminal devices belonging to the user group destined to the user group, the control unit transfers the voice signal to all of other terminal devices belonging to the user group.

US Pat. No. 10,165,241

SHIFT CONTROL CIRCUIT AND WIRELESS DEVICE

ICOM INCORPORATED, Osaka...

1. A shift control circuit provided in a wireless device that performs frequency modulation, and outputting an information signal to be applied to the frequency modulation, the shift control circuit comprising:a first limiter circuit that limits an amplitude of an input control target signal to be equal to or less than a first threshold;
a phase shifter that shifts, for the control target signal having the amplitude limited by the first limiter circuit to be equal to or less than the first threshold, a phase of a frequency component within a predetermined first frequency range by a predetermined amount;
a first suppressor that suppresses, for the control target signal phase-shifted by the phase shifter, the frequency component equal to or greater than a second threshold; and
a reducer that suppresses, for any of (i) the control target signal having the amplitude limited by the first limiter circuit to be equal to or less than the first threshold, (ii) the control target signal phase-shifted by the phase shifter, and (iii) the control target signal having the frequency component equal to or greater than the second threshold and suppressed by the first suppressor, a frequency component within a predetermined second frequency range, and thus reducing a wave height value of the information signal,
wherein the shift control circuit outputs the information signal that is the control target signal having the frequency component equal to or greater than the second threshold and suppressed by the first suppressor or the control target signal having the frequency component within the second frequency range and suppressed by the reducer.

US Pat. No. 10,148,342

RELAYING DEVICE, COMMUNICATION SYSTEM, AND METHOD FOR RELAYING AUDIO SIGNAL

Icom Incorporated, Osaka...

1. A relaying device comprising:a wireless apparatus interface connected to a wireless relaying apparatus communicating with multiple wireless handsets, inputting a received signal from the wireless relaying apparatus, and outputting a sending signal to be sent to the multiple wireless handsets to the wireless relaying apparatus, the multiple wireless handsets transmitting an audio signal at a first frequency and receiving the audio signal at a second frequency, the wireless relaying apparatus transmitting the audio signal at the second frequency and receiving the audio signal at the first frequency;
a signal processing unit connected to the wireless apparatus interface;
a network interface connected to a network acting as a data communication network and sending or receiving packets to or from another network device connected to the network;
a packet processing unit connected to the network interface; and
a mixing unit provided between the signal processing unit and the packet processing unit, wherein
the signal processing unit outputs a received signal inputted from the wireless apparatus interface as an uplink audio signal,
the packet processing unit packetizes the uplink audio signal and outputs the uplink audio signal to the network interface,
the packet processing unit reads out an audio signal from packets inputted from the network interface and outputs the audio signal as a downlink audio signal,
when a callback function is on:
the mixing unit mixes the downlink audio signal and the uplink audio signal and inputs the mixed downlink audio signal and the mixed uplink audio signal to the signal processing unit, and
the signal processing unit outputs the mixed downlink audio signal and the mixed uplink audio signal inputted from the mixing unit to the wireless apparatus interface as a sending signal,
when the callback function is off,
the mixing unit inputs the downlink audio signal to the signal processing unit, and
the signal processing unit outputs the downlink audio signal inputted from the mixing unit to the wireless apparatus interface as the sending signal, and
the wireless relaying apparatus sends the sending signal to the multiple wireless handsets at the second frequency.

US Pat. No. 10,149,147

TERMINAL DEVICE, TERMINAL CONFIGURATION SYSTEM, AND TERMINAL CONFIGURATION METHOD

ICOM INCORPORATED, Osaka...

1. A terminal device comprising:a network communication unit for processing communication over a first network and a second network;
a control unit having a volatile storage unit and a rewritable non-volatile storage unit; and
an operation unit, wherein
the volatile storage unit stores terminal configuration information,
the non-volatile storage unit stores single network information for connection to the first network or the second network,
when power is turned on by a user input to perform a first procedure of the operation unit for allowing the terminal device to connect to the first network, the control unit reads out first network information from the non-volatile storage unit and connects to the first network so as to make an access to a server on the first network, to obtain the terminal configuration information, and to write the terminal configuration information in the volatile storage unit,
when the power is turned on by the user input to perform a second procedure of the operation unit for configuring the terminal device, the control unit reads out the first network information from the non-volatile storage unit and connects to the first network so as to make an access to the server on the first network, to obtain one second network information selected from a plurality of second network information stored in the server on the first network by an operation of the operation unit for connection to a second network, and to overwrite and store the one second network information in the non-volatile storage unit as the network information,
the second network is different from the first network, and communication under the second network is independent from communication under the first network, and
in the second procedure of the operation unit, the one second network information is obtained and stored in the non-volatile storage unit before the terminal device enters in the second network.

US Pat. No. 10,194,372

RELAYING DEVICE, AUDIO-COMMUNICATION SYSTEM AND RELAYING METHOD FOR RELAYING AUDIO SIGNAL

ICOM INCORPORATED, Osaka...

1. A relaying device comprising:a network communication circuit for communicating with a terminal device via a network;
a processor for controlling communication with the terminal device; and
a memory in which a session table is provided, wherein
the network communication circuit receives an audio signal to which information designating the terminal device of a communication partner is attached from the terminal device,
the processor registers a communication session made up of the terminal device transmitting the audio signal and the terminal device designated by the designating information attached to the audio signal as participating terminals into the session table when the audio signal is received from the terminal device,
the processor transfers the audio signal received from the participating terminals including the audio signal to the participating terminals,
the processor mixes the audio signals and transmits the mixed audio signal to the participating terminals when the audio signals are received from two or more participating terminals at the same time,
the processor registers a new communication session made up of the terminal device transmitting the audio signal and the terminal device designated by the designating information as the participating terminals into the session table of the memory when the audio signal to which the designating information designating at least one of the terminal devices which is not included to the participating terminal of the communication session registered in the session table is received,
when the participating terminals of the newly registered communication session includes a participating terminal of another communication session registered beforehand, the processor deletes the terminal device which participates in both communication sessions from the communication session registered beforehand.

US Pat. No. 10,187,138

RELAYING DEVICE, AUDIO COMMUNICATION SYSTEM, AND AUDIO SIGNAL RELAY METHOD

ICOM INCORPORATED, Osaka...

1. A relaying device selectively operating in a master mode and a slave mode and connected to a communication network to which other relaying devices and plurality of terminal devices are also connected, the relaying device comprising:a network communication unit connected to the communication network and configured to communicate with a first group of the terminal devices and also configured to communicate with the other relaying devices each having a second group of the terminal devices communicating therewith; and
a control unit causing the relaying device to operate in the master mode or in the slave mode, wherein
during group communication in which two or more of the terminal devices communicate with each other,
in the master mode, the control unit transfers a first audio signal received from one of the terminal devices of the first group to the other of the terminal devices of the first group and the other relaying devices that are in the slave mode, and also transfers a second audio signal received from one of the other relaying devices that is in the slave mode to the other of the other relaying devices that is in the slave mode and the terminal devices in the first group; and
in the slave mode, the control unit transfers the first audio signal received from one of the terminal devices of the first group to the other of the terminal devices of the first group and one of the other relaying devices that is in the master mode, and also transfers the second audio signal received from the one of the other relaying devices that is in the master mode to the terminal devices of the first group.

US Pat. No. 10,200,539

RELAYING DEVICE, AUDIO COMMUNICATION SYSTEM, AND RELAYING METHOD

ICOM INCORPORATED, Osaka...

1. An audio communication system comprising:a relaying device and terminal devices communicating mutually via a communication network; wherein
the relaying device comprises a control unit that
establishes the communication session among the terminal devices through which the terminal devices communicate audio signals,
stores a mixing table in which a session identification number and terminal device numbers are associated each other wherein the session identification number is to identify an existing communication session that is currently running and the device terminal numbers are to identify participating terminal devices that are currently participating in the existing communication session, and
stores a priority table in which types and priority ranks of communication sessions are associated, wherein
when an operator of one of the terminal devices transits an audio signal to establish a new communication session wherein the operator selects some of the terminal devices, which includes some of the participating terminal devices of the existing communication session, that are authorized to participate in the new communication session, and a type of the new communication session, and ID information identifying the authorized terminal devices and the type of the new communication session are transmitted to the relaying device together with the audio signal, the control unit
determines priority ranks of the new communication session and the existing communication session referring to the mixing table and the priority table,
compares the priority rank of the new communication session with the priority rank of the existing communication session,
when the priority rank of the new communication session is equal to or lower than that of the existing communication session, the control unit
establishes the new communication session,
determines the participating terminal devices of the existing communication session in the authorized terminal devices to participate in the new communication session by referring to the ID information and the mixing table, and
allows the authorized terminal devices excluding the participating terminal devices of the existing communication session to participate in the new communication session as participating terminal devices of the new communication session so that the audio signal is transmitted to the participating terminal devices of the new communication session,
when the priority of the new communication session is higher than that of the existing communication session, the control unit
establishes the new communication session,
allows the authorized terminal devices including the some of the participating terminal devices of the existing communication session to participate in the new communication session as participating terminal devices of the new communication session so that the audio signal is transmitted to the participating terminal devices of the new communication session,
determines the participating terminal devices of the new communication session in the participating terminal devices of the existing communication session by referring to the ID information and the mixing table, and
eliminates the participating terminal devices of the new communication session from the existing communication session so that the audio signal of the existing communication session is not transmitted to the participating terminal devices of the new communication session, and
each of the terminal devices comprises a terminal network communication unit communicating with the relaying device via the communication network and a terminal control unit transmitting the audio signal to which information designating the terminal device of the communication partner is attached to the relaying device using the terminal network communication unit.

US Pat. No. 10,263,665

COMMUNICATION SYSTEM

Icom Incorporated, Osaka...

1. A communication system, comprising:a data communication network;
a repeater;
a relaying device comprising:
a network interface connected to the data communication network for transmitting or receiving an audio packet and a control packet to or from a phone connected to the network;
a wireless device interface connected to the repeater for inputting or outputting an audio signal into or from the repeater; and
a control unit for controlling a session with the phone via the network, the session being defined as a series of steps for transmitting or receiving the audio packet and the control packet, wherein
the repeater is connected to the wireless device interface of the relaying device, the wireless terminal device communicates with the repeater,
when the relaying device receives a calling signal from the phone, the control unit transmits a prompting signal to the phone, the prompting signal being a signal that prompts the phone to input the identification information of the wireless terminal device with which the phone requests to communicate, the calling signal initiating to establish the session between the phone and the relaying device,
the control unit outputs the audio signal in which the identification information is embedded to the wireless device interface when the identification information of the wireless terminal device is transmitted from the phone,
the control unit comprises a table which relates the identification information identifying the wireless terminal device to a wireless device number identifying the wireless terminal device in the network;
the control unit determines the wireless device number related to the identification information received from the phone as the identification information for referred to the table and embeds the wireless device number as the identification information in the audio signal,
the wireless terminal device is identified by the wireless device number,
the phone transmits the calling signal to the relaying device,
the relaying device transmits the prompting signal when receiving the calling signal from the phone,
the phone transmits the identification information to the relaying device when receiving the prompting signal from the relaying device,
the relaying device determines the wireless device number related to the identification information received from the phone for referred to the table, embeds the wireless device number in the audio signal when receiving the identification information from the phone, and outputs the audio signal in which the wireless device number is embedded to the wireless device interface,
the repeater wirelessly transmits the audio signal when the audio signal embedding the wireless device number is input from the relaying device, and
the wireless terminal device identified by the embedded wireless device number receives and plays the audio signal.

US Pat. No. 10,382,865

WIRELESS COMMUNICATIONS DEVICE AND METHOD OF CONTROLLING WIRELESS COMMUNICATIONS DEVICE

Icom Incorporated, Osaka...

1. A wireless communications device comprising:an acceleration sensor configured to detect acceleration;
an angle calculator configured to calculate, based on the acceleration, a tilt angle of the wireless communications device with respect to a vertical direction;
a first audio filter and a second audio filter which have respective different frequency characteristics, the second audio filter having a lower cutoff frequency that is higher than a lower cutoff frequency of the first audio filter; and
a selector configured to carry out selection of which one of the first and second audio filters to operate,
the selector being configured to
select the first audio filter if the tilt angle is less than a predetermined threshold angle, and
select the second audio filter if the tilt angle is equal to or greater than the predetermined threshold angle.

US Pat. No. 10,397,769

COMMUNICATION SYSTEM MANAGEMENT METHOD AND COMMUNICATION SYSTEM MANAGEMENT DEVICE

ICOM INCORPORATED, Osaka...

1. A communication system management method to transfer a predetermined communication terminal belonging to a first communication sub-system to a second communication sub-system in a communication system, wherein:the communication system includes:
the first communication sub-system and the second communication sub-system, wherein each communication terminal belonging to one of the first communication sub-system and the second communication sub-system does not communicate with communication terminals belong to an other one of the first communication sub-system and the second communication sub-system;
a first server that controls a communication between communication terminals belonging to the first communication sub-system;
a second server that controls a communication between communication terminals belonging to the second communication sub-system;
a first configuration device that includes a first configuration file storing therein configuration data of the communication terminals belonging to the first communication sub-system and that configures the first server with information of the communication terminals belong to the first communication sub-system;
a second configuration device that includes a second configuration file storing therein configuration data of the communication terminals belonging to the second communication sub-system and that configures the second server with information of the communication terminals belong to the second communication sub-system; and
a management device that updates the first configuration file and the second configuration file,
the method is comprising:
causing the management device to acquire the first configuration file from the first configuration device;
deleting information of the predetermined communication terminal from the first configuration file;
causing the first configuration device to read in the first configuration file;
causing the management device to acquire the second configuration file from the second configuration device;
adding the information of the predetermined communication terminal to the second configuration device;
causing the second configuration device to read in the second configuration file;
causing the first configuration device to update the information configured to the first server with the read first configuration file; and
causing the second configuration device to update the information configured to the second server with the read second configuration file.

US Pat. No. 10,397,849

RELAYING DEVICE, COMMUNICATION RELAYING METHOD AND VOICE COMMUNICATION SYSTEM

ICOM INCORPORATED, Osaka...

1. A relaying device comprising:a network communication unit connected to a communication network and communicating with a plurality of terminal devices over the communication network; and
a control unit controlling voice communication between the plurality of terminal devices by transferring a voice signal received from one of the plurality of terminal devices via the network communication unit to at least one of remaining one of the plurality of terminal devices of a communication partner, wherein
the control unit:
forms a plurality of communication sessions to which the plurality of terminal devices belong;
includes a table in which a participating terminal, which is a terminal device that belongs to and participates in a communication session, and a non-participating terminal, which is a terminal device that belongs to but does not participate in a communication session, are registered for each of the plurality of communication sessions;
registering, in the table, a terminal device belonging to one communication session as a participating terminal for the one communication session;
registering, in the table, a terminal device belonging to two or more communication sessions as a participating terminal for one of the two or more communication sessions and as a non-participating terminal for a reminder of the two or more communication sessions; and
when the voice signal is received from a transmitting terminal device in a first communication session, transfers the received voice signal to another participating terminal device participating in the first communication session and transfers simultaneously to a predetermined one of the non-participating terminal devices belonging to the first communication session by mixing the received voice signal with a voice signal of a second communication session to which the predetermined one of the non-participating terminal devices also belong as a participating terminal.

US Pat. No. 10,438,608

NOISE SUPPRESSION CIRCUIT, COMMUNICATION DEVICE, NOISE SUPPRESSION METHOD, AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM STORING PROGRAM

ICOM INCORPORATED, Osaka...

1. A noise suppression circuit comprising:an FFT processor that divides an input signal into frames, applies a fast Fourier transform to each frame of the input signal, and generates frequency domain data;
a first spectrum calculator that calculates an amplitude spectrum of the input signal for individual frequency components based on the frequency domain data;
a dispersion index calculator that calculates a dispersion index for the individual frequency components, the dispersion index indicating a level of dispersion of the amplitude spectrum of the input signal in latest frames;
a noise index calculator that calculates a noise index based on the dispersion index, the noise index indicating a level of noise contained in the input signal;
a second spectrum calculator that calculates an amplitude spectrum of the noise for the individual frequency components based on the amplitude spectrum of the input signal and the noise index;
a gain calculator that calculates a spectral gain for suppressing the noise for the individual frequency components based on the amplitude spectrum of the input signal and the amplitude spectrum of the noise;
a multiplier that multiplies the frequency domain data by the spectral gain; and
an IFFT processor that applies an inverse fast Fourier transform to the frequency domain data after multiplication by the spectral gain, and generates a signal to be output, wherein
the amplitude spectrum of the noise calculated at the second spectrum calculator is a moving average of the amplitude spectrum of the input signal in the latest frames for the individual frequency components, the moving average being weighted by a factor associated with the noise index;
the factor associated with the noise index is a product of the noise index and an index adjustment factor; and
the index adjustment factor, when the amplitude spectrum of the input signal is equal to or larger than the amplitude spectrum of the noise for a preceding frame, is smaller than the index adjustment factor, when the amplitude spectrum of the input signal is smaller than the amplitude spectrum of the noise for the preceding frame.

US Pat. No. 10,447,582

COMMUNICATION CONTROL DEVICE, WIRELESS DEVICE, COMMUNICATION CONTROL SYSTEM, COMMUNICATION CONTROL METHOD AND PROGRAM

ICOM INCORPORATED, Osaka...

1. A communication control device comprising:an association table updater that updates, when receiving from a first wireless device a first packet containing an identification number of a first communication terminal connected to the first wireless device, an association table storing an address of the first wireless device and the identification number of the first communication terminal in association with each other; and
a correction packet transmitter that transmits, when a second packet received from a second wireless device to which a second communication terminal is connected contains an address of the second wireless device, an identification number of the second communication terminal, and an identification number indicating a destination of the second packet, and when the identification number indicating the destination is the identification number of the first communication terminal stored in the association table, a first correction packet containing the address of the second wireless device and the identification number of the second communication terminal to the first wireless device after the second packet is transmitted to the first wireless device,
wherein the correction packet transmitter further transmits, to the second wireless device, a second correction packet containing the address of the first wireless device and the identification number of the first communication terminal.