US Patent No. 10,433,099

METHOD FOR GENERATING FILTER FOR AUDIO SIGNAL, AND PARAMETERIZATION DEVICE FOR SAME


Patent No. 10,433,099
Issue Date October 01, 2019
Title Method For Generating Filter For Audio Signal, And Parameterization Device For Same
Inventorship Taegyu Lee, Gyeonggi-do (KR)
Hyunoh Oh, Gyeonggi-do (KR)
Assignee WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., Gyeonggi-Do (KR)

Claim of US Patent No. 10,433,099

1. A method for processing an audio signal, comprising:receiving an input audio signal;
receiving binaural room impulse response (BRIR) filter coefficients;
obtaining flag information indicating whether a length of the BRIR filter coefficients is more than a predetermined value in a time domain;
converting the BRIR filter coefficients into a set of subband filter coefficients for each subband;
obtaining average reverberation time information of a subband by using reverberation time information extracted from the set of subband filter coefficients;
obtaining one or more coefficients for curve fitting the average reverberation time information;
obtaining filter order information for determining a truncation length of the set of subband filter coefficients, wherein the filter order information is obtained, based on the flag information, by using the average reverberation time information or by using the one or more coefficients, and the filter order is determined to be variable in a frequency domain;
truncating the set of subband filter coefficients by using the filter order information, wherein an energy compensation is performed to the truncated set of subband filter coefficients based on the flag information; and
filtering each subband signal of the input audio signal by using the truncated set of subband filter coefficients corresponding thereto.