Time-domain stereo encoding and decoding method and related product

Patent metadata

Field	Value
Publication number	US-12531073-B2
Application number	US-202318544935-A
Country	US
Kind code	B2
Filing date	Dec 19, 2023
Priority date	Aug 10, 2017
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

An audio encoding and decoding method and a related apparatus are provided. The audio encoding method includes: determining a channel combination scheme for a current frame; when the channel combination scheme for the current frame is different from a channel combination scheme for a previous frame, performing segmented time-domain downmix processing on left and right channel signals in the current frame based on the channel combination scheme for the current frame and the channel combination scheme for the previous frame, to obtain a primary channel signal and a secondary channel signal in the current frame; and encoding the obtained primary channel signal and secondary channel signal in the current frame.

First claim

What is claimed is:

1 . An audio encoding method, comprising:
determining a channel combination scheme for a current frame; performing, based on the channel combination scheme for the current frame and a channel combination scheme for a previous frame, segmented time-domain mix processing on a left and a right channel signals in the current frame to obtain a primary channel signal and a secondary channel signal in the current frame when the channel combination scheme for the current frame is different from the channel combination scheme for the previous frame; encoding the obtained primary channel signal and secondary channel signal in the current frame; wherein the channel combination scheme for the current frame is one of a plurality of channel combination schemes, the plurality of channel combination schemes including an anticorrelated signal channel combination scheme corresponding to a near out of phase signal; and the performing segmented time-domain mix processing comprises: performing, by using a first channel combination ratio factor corresponding to the previous frame, time-domain mix processing on start segments of the left and right channel signals in the current frame, to obtain start segments of the primary and secondary channel signals in the current frame; performing, by using the first channel combination ratio factor, time-domain mix processing on middle segments of the left and right channel signals in the current frame, to obtain first temporal middle segments of the primary and secondary channel signals in the current frame; performing, by using a second channel combination ratio factor corresponding to the current frame, time-domain mix processing on the middle segments of the left and right channel signals in the current frame, to obtain second temporal middle segments of the primary and secondary channel signals in the current frame; and obtaining middle segments of the primary and secondary channel signals in the current frame based on the first temporal middle segments and the second temporal middle segments.

2 . The method according to claim 1 , wherein the left and right channel signals in the current frame at least comprise the start segments of the left and right channel signals, and end segments of the left and right channel signals, and the primary and secondary channel signals in the current frame at least comprise the start segments of the primary and secondary channel signals, and end segments of the primary and secondary channel signals;
wherein the performing, based on the channel combination scheme for the current frame and the channel combination scheme for the previous frame, segmented time-domain mix processing on left and right channel signals in the current frame to obtain a primary channel signal and a secondary channel signal in the current frame comprises: performing, based on the start segments of the left and right channel signals and the end segments of the left and right channel signals, segmented time-domain mix processing to obtain the start segments of the primary and secondary channel signals and the end segments of the primary and secondary channel signals, respectively.

3 . The method according to claim 2 , wherein when the channel combination scheme for the previous frame is a correlated signal channel combination scheme, and the channel combination scheme for the current frame is the anticorrelated signal channel combination scheme,
the performing, based on the start segments of the left and right channel signals and the end segments of the left and right channel signals, segmented time-domain mix processing to obtain the start segments of the primary and secondary channel signals and the end segments of the primary and secondary channel signals, respectively, comprises:
performing, by using a channel combination ratio factor corresponding to the anticorrelated signal channel combination scheme for the current frame and a time-domain mix processing manner corresponding to the anticorrelated signal channel combination scheme for the current frame, time-domain mix processing on the end segments of the left and right channel signals in the current frame, to obtain the end segments of the primary and secondary channel signals in the current frame.

4 . The method according to claim 2 , wherein when the channel combination scheme for the previous frame is the anticorrelated signal channel combination scheme, and the channel combination scheme for the current frame is a correlated signal channel combination scheme,
the performing, based on the start segments of the left and right channel signals and the end segments of the left and right channel signals, segmented time-domain mix processing to obtain the start segments of the primary and secondary channel signals and the end segments of the primary and secondary channel signals, respectively, comprises:
performing, by using a channel combination ratio factor corresponding to the anticorrelated signal channel combination scheme for the previous frame and a time-domain mix processing manner corresponding to the anticorrelated signal channel combination scheme for the previous frame, time-domain mix processing on the start segments of the left and right channel signals in the current frame, to obtain the start segments of the primary and secondary channel signals in the current frame; and
performing, by using a channel combination ratio factor corresponding to the correlated signal channel combination scheme for the current frame and a time-domain mix processing manner corresponding to the correlated signal channel combination scheme for the current frame, time-domain mix processing on the end segments of the left and right channel signals in the current frame, to obtain the end segments of the primary and secondary channel signals in the current frame.

5 . A time-domain stereo encoding apparatus, comprising:
a memory for storing processor-executable instructions; and a processor operatively coupled to the memory, the processor being configured to execute the processor-executable instructions to perform operations, the operations including: determining a channel combination scheme for a current frame; performing, based on the channel combination scheme for the current frame and a channel combination scheme for a previous frame, segmented time-domain mix processing on a left and a right channel signals in the current frame to obtain a primary channel signal and a secondary channel signal in the current frame when the channel combination scheme for the current frame is different from the channel combination scheme for the previous frame; encoding the obtained primary channel signal and secondary channel signal in the current frame; wherein the channel combination scheme for the current frame is one of a plurality of channel combination schemes, the plurality of channel combination schemes including an anticorrelated signal channel combination scheme corresponding to a near out of phase signal; and the performing segmented time-domain mix processing comprises: performing, by using a first channel combination ratio factor corresponding to the previous frame, time-domain mix processing on start segments of the left and right channel signals in the current frame, to obtain start segments of the primary and secondary channel signals in the current frame; performing, by using the first channel combination ratio factor, time-domain mix processing on middle segments of the left and right channel signals in the current frame, to obtain first temporal middle segments of the primary and secondary channel signals in the current frame; performing, by using a second channel combination ratio factor corresponding to the current frame, time-domain mix processing on the middle segments of the left and right chann

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Bin
• Li Haiting
• Miao Lei

Classifications

• G10L19/22

  Mode decision, i.e. based on audio signal content versus external parameters · CPC title

• G10L19/20

  using sound class specific coding, hybrid encoders or object based coding · CPC title

• G10L19/008 Primary

  Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing · CPC title