US Patent No. 10,692,508

METHOD FOR GENERATING FILTER FOR AUDIO SIGNAL AND PARAMETERIZING DEVICE THEREFOR


Patent No. 10,692,508
Issue Date June 23, 2020
Title Method For Generating Filter For Audio Signal And Parameterizing Device Therefor
Inventorship Taegyu Lee, Seongnam-si (KR)
Hyunoh Oh, Seongnam-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 INSTITUTE, Daejeon (KR) INDUST...

Claim of US Patent No. 10,692,508

1. A method for post-processing an audio signal by a binaural renderer, 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 value for each subband obtained by at least partially using characteristic information extracted from each set of subband filter coefficients, wherein the filter order value is determined to be variable in a frequency domain;
generating fast Fourier transform (FFT) filter coefficients by fast Fourier transforming each set of truncated subband filter coefficients by a predetermined block size in a corresponding subband; and
performing block-wise fast convolution on each subband signal of the input audio signal by using the FFT filter coefficients corresponding thereto,
wherein the predetermined block size is determined to be a smaller value between a first value and a second value,
wherein the first value is obtained by multiplying a reference filter length of a corresponding set of truncated subband filter coefficients by 2, and
wherein the second value is a predetermined maximum FFT size.