US 11,722,821 B2
Sound capture for mobile devices
Chunjian Li, Beijing (CN)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Appl. No. 15/999,733
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
PCT Filed Feb. 16, 2017, PCT No. PCT/US2017/018174
§ 371(c)(1), (2) Date Aug. 20, 2018,
PCT Pub. No. WO2017/143067, PCT Pub. Date Aug. 24, 2017.
Claims priority of provisional application 62/309,370, filed on Mar. 16, 2016.
Claims priority of application No. PCT/CN2016/074104 (WO), filed on Feb. 19, 2016; and application No. 16161827 (EP), filed on Mar. 23, 2016.
Prior Publication US 2021/0211806 A1, Jul. 8, 2021
Int. Cl. H04R 5/027 (2006.01); H04R 1/26 (2006.01); H04R 5/04 (2006.01); H04R 29/00 (2006.01); H04S 5/00 (2006.01); H04R 3/12 (2006.01); H04R 3/00 (2006.01)
CPC H04R 5/027 (2013.01) [H04R 1/265 (2013.01); H04R 5/04 (2013.01); H04R 29/005 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A computer-implemented method, comprising:
receiving a plurality of audio signals from a plurality of microphones of a mobile device,
each audio signal in the plurality of audio signals being generated by a respective microphone in the plurality of microphones;
selecting one or more first microphones from among the plurality of microphones to generate a front audio signal m1;
selecting one or more second microphones from among the plurality of microphones to generate a back audio signal m2;
removing a first audio signal portion from the front audio signal m1 to generate a modified front audio signal Sf, the first audio signal portion being determined based at least in part on the back audio signal m2;
using a first spatially filtered audio signal b1 formed by applying a first spatial filter to two or more audio signals of two or more third microphones in the plurality of audio signals to remove a second audio signal portion from the modified front audio signal Sf to generate a right-front audio signal R; and
using a second spatially filtered audio signal b2 formed by applying a second spatial filter to two or more audio signals of two or more fourth microphones in the plurality of audio signals to remove a third audio signal portion from the modified front audio signal Sf to generate a left-front audio signal L,
wherein the first audio signal portion is obtained by applying a back-to-front transfer function H21 (z) to the back audio signal m2, the back-to-front transfer function H21 (z) being determined beforehand on the basis of A) a first front response audio signal m1′ generated by the one or more first microphones in response to a test back sound emitted by a test back sound source and B) a first back response audio signal m2′ generated by the one or more second microphones in response to the test back sound emitted by the test back sound source.