US 12,231,603 B2
Echo residual suppression
Ning Wang, Epping (AU)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Appl. No. 17/911,529
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
PCT Filed Mar. 19, 2021, PCT No. PCT/US2021/023059
§ 371(c)(1), (2) Date Sep. 14, 2022,
PCT Pub. No. WO2021/194859, PCT Pub. Date Sep. 30, 2021.
Claims priority of provisional application 63/153,523, filed on Feb. 25, 2021.
Claims priority of provisional application 62/993,149, filed on Mar. 23, 2020.
Prior Publication US 2023/0138637 A1, May 4, 2023
Int. Cl. H04M 9/08 (2006.01); G10K 11/178 (2006.01)
CPC H04M 9/082 (2013.01) [G10K 11/17823 (2018.01); G10K 11/17854 (2018.01)] 20 Claims
OG exemplary drawing
 
1. A computer-implemented method of audio processing, the method comprising:
receiving a reference signal and an echo residual signal;
generating a banded reference signal and a banded echo residual signal by performing frequency banding on the reference signal and the echo residual signal, respectively;
calculating an estimated power gain profile of an acoustic echo canceller and a loopback power based on the banded reference signal and the banded echo residual signal, wherein the loopback power corresponds to a combination of historical values of the banded reference signal, and wherein the loopback power is based on a plurality of dominant taps of a plurality of adaptive filters;
calculating an estimated echo residual power based on the banded echo residual signal, the loopback power and the estimated power gain profile;
calculating a plurality of banded gains based on the banded echo residual signal and the estimated echo residual power; and
generating a modified echo residual signal by applying the plurality of banded gains to the echo residual signal.