US Patent No. 10,204,630

METHOD FOR GENERATING FILTER FOR AUDIO SIGNAL AND PARAMETERIZING DEVICE THEREFOR


Patent No. 10,204,630
Issue Date February 12, 2019
Title Method For Generating Filter For Audio Signal And Parameterizing Device Therefor
Inventorship Taegyu Lee, Seongnam-si (KR)
Hyunoh Oh, Gwacheon-si (KR)
Jeongil Seo, Daejeon (KR)
Yongju Lee, Daejeon (KR)
Seungkwon Beack, Seoul (KR)
Kyeongok Kang, Daejeon (KR)
Daeyoung Jang, Daejeon (KR)
Youngcheol Park, Wonju-si (KR)
Daehee Youn, Seoul (KR)
Assignee ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTIT UTE, Daejeon (KR) INDUS...

Claim of US Patent No. 10,204,630

1. A method for processing an audio signal, comprising:receiving an input audio signal;
receiving one or more binaural room impulse response (BRIR) filter coefficients in a time domain corresponding to at least one position in a virtual reproduction space;
converting the BRIR filter coefficients into a plurality of sets of subband filter coefficients;
truncating each set of subband filter coefficients based on a filter order obtained by at least partially using characteristic information extracted from each set of subband filter coefficients, wherein a length of a set of truncated subband filter coefficients of at least one subband is different from a length of a set of truncated subband filter coefficients of another subband;
generating FFT filter coefficients by fast Fourier transforming (FFT) each set of truncated subband filter coefficients by a predetermined block size in a corresponding subband, wherein the predetermined block size is determined to be a smaller value between first and second values, the first value being obtained by multiplying a reference filter length of a corresponding set of truncated subband filter coefficients by 2, the second value being a predetermined maximum FFT size; and
performing block-wise fast convolution on each subband signal of the input audio signal by using the FFT filter coefficients corresponding thereto.