US 12,014,744 B2
Method and apparatus for binaural rendering audio signal using variable order filtering in frequency domain
Taegyu Lee, Seongnam-si (KR); Hyunoh Oh, Gwacheon-si (KR); Youngcheol Park, Wonju-si (KR); Daehee Youn, Seoul (KR); Jeongil Seo, Daejeon (KR); Yongju Lee, Daejeon (KR); Seungkwon Beack, Seoul (KR); Kyeongok Kang, Daejeon (KR); and Daeyoung Jang, Daejeon (KR)
Assigned to INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, Seoul (KR); WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., Seongnam-si (KR); and ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed by INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, Seoul (KR); WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., Seongnam-si (KR); and ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed on Nov. 2, 2021, as Appl. No. 17/517,630.
Application 17/517,630 is a continuation of application No. 16/747,533, filed on Jan. 21, 2020, granted, now 11,195,537.
Application 16/747,533 is a continuation of application No. 15/031,275, granted, now 10,580,417, issued on Mar. 3, 2020, previously published as PCT/KR2014/009975, filed on Oct. 22, 2014.
Claims priority of provisional application 61/973,868, filed on Apr. 2, 2014.
Claims priority of application No. 10-2013-0125930 (KR), filed on Oct. 22, 2013; and application No. 10-2013-0125933 (KR), filed on Oct. 22, 2013.
Prior Publication US 2022/0059105 A1, Feb. 24, 2022
Int. Cl. G10L 19/008 (2013.01); H04R 3/00 (2006.01); H04R 5/033 (2006.01); H04S 3/00 (2006.01)
CPC G10L 19/008 (2013.01) [H04R 5/033 (2013.01); H04S 3/00 (2013.01); H04S 3/002 (2013.01); H04S 3/004 (2013.01); H04S 3/008 (2013.01); G10H 2250/111 (2013.01); G10H 2250/145 (2013.01); H04R 3/00 (2013.01); H04S 2400/01 (2013.01); H04S 2420/01 (2013.01); H04S 2420/03 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A method for processing an audio signal, the method comprising:
receiving an input audio signal including a plurality of subband signals, wherein the plurality of subband signals include subband signals of a first subband group having low frequencies based on a predetermined frequency band and subband signals of a second subband group having high frequencies based on the predetermined frequency band;
receiving a set of truncated subband filter coefficients for filtering each subband signal of the plurality of subband signals, wherein the set of truncated subband filter coefficients is at least a portion of a corresponding set of subband filter coefficients obtained from binaural room impulse response (BRIR) filter coefficients for binaural filtering of the input audio signal;
generating fast Fourier transform (FFT) filter coefficients by fast Fourier transforming each set of truncated subband filter coefficients by a block size in a corresponding subband, wherein the 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;
performing fast Fourier transform of subband signals of the first subband group based on a predetermined subframe size in the corresponding subband;
generating at least one filtered subframe for each subband, wherein each filtered subframe is generated by multiplying a corresponding subframe and the FFT filter coefficients;
inverse fast Fourier transforming the at least one filtered subframe for each subband; and
generating a filtered subband signal by overlap-adding the at least one inverse fast Fourier transformed subframe for each subband.