US 11,706,564 B2
Processing of microphone signals for spatial playback
David S. McGrath, Rose Bay (AU)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed by DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US)
Filed on Jan. 24, 2022, as Appl. No. 17/583,114.
Application 17/583,114 is a continuation of application No. 15/999,764, granted, now 11,234,072, previously published as PCT/US2017/018082, filed on Feb. 16, 2017.
Claims priority of provisional application 62/297,055, filed on Feb. 18, 2016.
Claims priority of application No. 16169658 (EP), filed on May 13, 2016.
Prior Publication US 2022/0225022 A1, Jul. 14, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 3/00 (2006.01); H04R 1/40 (2006.01); H04R 5/04 (2006.01)
CPC H04R 3/005 (2013.01) [H04R 1/406 (2013.01); H04R 5/04 (2013.01); H04R 2499/11 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of processing audio, comprising:
receiving an input signal including a plurality of microphone signals;
determining a mixing matrix based on characteristics of the input signal; and
mixing the input signal according the mixing matrix to produce a multichannel audio output signal including a plurality of output channels, wherein determining the mixing matrix comprises:
determining a vector representative of a dominant direction of arrival and a steering strength parameter representative of a degree to which the microphone signals appear to contain a single dominant direction of arrival; and
determining the mixing matrix by determining a weighted sum of a first matrix that is independent of the dominant direction of arrival and a second matrix that correlates to the dominant direction of arrival, wherein the first matrix is weighted by a first weight that decreases for an increase in value of the steering strength parameter, and wherein the second matrix is weighted by a second weight that increases for an increase in value of the steering strength parameter.