US 12,334,084 B2
Multi-channel signal encoding method and encoder
Zexin Liu, Shenzhen (CN); Xingtao Zhang, Shenzhen (CN); Haiting Li, Beijing (CN); and Lei Miao, Beijing (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Jan. 23, 2024, as Appl. No. 18/419,794.
Application 18/419,794 is a continuation of application No. 17/408,116, filed on Aug. 20, 2021, granted, now 11,935,548.
Application 17/408,116 is a continuation of application No. 16/272,397, filed on Feb. 11, 2019, granted, now 11,133,014, issued on Sep. 28, 2021.
Application 16/272,397 is a continuation of application No. PCT/CN2017/074419, filed on Feb. 22, 2017.
Claims priority of application No. 201610652506.X (CN), filed on Aug. 10, 2016.
Prior Publication US 2024/0161756 A1, May 16, 2024
Int. Cl. G10L 19/008 (2013.01); G10L 19/022 (2013.01); G10L 19/032 (2013.01); G10L 25/03 (2013.01); H04S 3/00 (2006.01)
CPC G10L 19/008 (2013.01) [G10L 19/022 (2013.01); G10L 19/032 (2013.01); G10L 25/03 (2013.01); H04S 3/00 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method performed by an audio encoder comprising a processor, wherein the method comprises:
obtaining a first multi-channel audio signal of a current frame originating from a microphone;
determining a first multi-channel parameter of the current frame, wherein the first multi-channel parameter comprises an initial inter-channel time difference (ITD) value of the current frame in a hybrid-domain and is based on the following formula:

OG Complex Work Unit Math
wherein ITD is the ITD value, wherein Li(f) represents a first frequency domain coefficient of a left-channel frequency-domain signal of the first multi-channel audio signal, wherein R*i(f) represents a conjugate of a second frequency domain coefficient of a right-channel frequency-domain signal of the first multi-channel audio signal, wherein argmax( ) is a maximum value from a plurality of values, and wherein IDFT() represents an inverse discrete Fourier transform operation;
determining a first difference parameter based on first differences between the first multi-channel parameter and second multi-channel parameters of previous K frames of the current frame, wherein K is an integer greater than or equal to 1;
determining a third multi-channel parameter of the current frame based on the first difference parameter and a characteristic parameter of the current frame; and
encoding, based on the third multi-channel parameter, the first multi-channel audio signal into a bitstream.