Inter-channel phase difference parameter encoding method and apparatus

Patent metadata

Field	Value
Publication number	US-12387732-B2
Application number	US-202418763087-A
Country	US
Kind code	B2
Filing date	Jul 3, 2024
Priority date	Jun 30, 2017
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

The present disclosure discloses an inter-channel phase difference parameter encoding method, where a current frame is obtained; a signal type and a previous IPD parameter encoding scheme of a previous frame are obtained; a current IPD parameter encoding scheme is obtained at least based on the signal type of the previous frame and the previous IPD parameter encoding scheme; and an IPD parameter of the current frame is processed based on the current IPD parameter encoding scheme.

First claim

What is claimed is:

1. An inter-channel phase difference (IPD) parameter encoding method, comprising:
obtaining a signal type of a first frame of an audio signal, wherein the signal type is either a music type or not a music type;
obtaining a first IPD parameter encoding scheme of the first frame, wherein the first IPD parameter encoding scheme is either a first preset IPD parameter encoding scheme or a second preset IPD parameter encoding scheme;
processing a first IPD parameter of the first frame based on the first IPD parameter encoding scheme;
determining, based on the signal type of the first frame and the first IPD parameter encoding scheme, a second IPD parameter encoding scheme of a second frame of the audio signal, wherein the second frame is subsequent to the first frame in time domain; wherein
when the signal type of the first frame is not the music type, and the first IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme; or
when the signal type of the first frame is the music type, and the first IPD parameter encoding scheme is the second preset IPD parameter encoding scheme, the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme; and

processing a second IPD parameter of the second frame based on the second IPD parameter encoding scheme.

2. The method according to claim 1 , further comprises:
obtaining a signal type of a third frame of the audio signal, wherein the first frame is subsequent to the third frame in time domain; and
obtaining a third IPD parameter encoding scheme of the third frame, wherein the determining, based on the signal type of the first frame and the first IPD parameter encoding scheme, a second IPD parameter encoding scheme of a second frame of the audio signal comprises:
determining, based on the signal type of the first frame, the signal type of the third frame, the third IPD parameter encoding scheme and the first IPD parameter encoding scheme, the second IPD parameter encoding scheme.

3. The method according to claim 2 , wherein:
when the signal type of the first frame is not the music type, the signal type of the third frame is the music type, the third IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, and the first IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme;
when the signal type of the first frame is the music type, the signal type of the third frame is not the music type, the third IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, and the first IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, determining the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme;
when the signal type of the first frame is the music type, the signal type of the third frame is the music type, the third IPD parameter encoding scheme is the second preset IPD parameter encoding scheme, and the first IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, determining the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme; or
when the signal type of the first frame is the music type, the signal type of the third frame is the music type, the third IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, and the first IPD parameter encoding scheme is the second preset IPD parameter encoding scheme, determining the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme.

4. The method according to claim 1 , wherein the first preset IPD parameter encoding scheme comprises one of the following manners:
a group IPD parameter encoding scheme;
skipping encoding an IPD parameter; or
setting a value of an IPD parameter to 0.

5. The method according to claim 1 , wherein the second preset IPD parameter encoding scheme comprises an IPD parameter encoding scheme of a subband set, or a subband IPD parameter encoding scheme, and the subband IPD parameter encoding scheme indicates encoding subband IPD parameters of a subset or all of subbands of a current frame.

6. The method according to claim 5 , wherein the second IPD parameter encoding scheme is the subband IPD parameter encoding scheme; and wherein
the processing an IPD parameter of the second frame based on the second IPD parameter encoding scheme comprises:
calculating IPD parameters of all or a subset of subbands of left channel frequency domain signal and right channel frequency domain signal of the second frame; and
encoding the IPD parameters that are of all or a subset of the subbands and that are obtained through calculation.

7. The method according to claim 1 , further comprises:
performing encoding based on a determined IPD parameter encoding scheme of a current frame.

8. An inter-channel phase difference parameter encoding apparatus, comprising:
a memory for storing computer-executable instructions; and
a processor operatively coupled to the memory, the processor being configured to execute the computer-executable instructions to:
obtain a signal type of a first frame of an audio signal, wherein the signal type is either a music type or not a music type;
obtain a first IPD parameter encoding scheme of the first frame, wherein the first IPD parameter encoding scheme is either a first preset IPD parameter encoding scheme or a second preset IPD parameter encoding scheme;
process a first IPD parameter of the first frame based on the first IPD parameter encoding scheme;
determine, based on the signal type of the first frame and the first IPD parameter encoding scheme, a second IPD parameter encoding scheme of a second frame of the audio signal, wherein the second frame is subsequent to the first frame in time domain; wherein
when the signal type of the first frame is not the music type, and the first IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme; or
when the signal type of the first frame is the music type, and the first IPD parameter encoding scheme is the second preset IPD parameter encoding scheme, the second IPD parameter encoding scheme is the second preset IPD parameter encoding scheme; and

process a second IPD parameter of the second frame based on the second IPD parameter encoding scheme.

9. The inter-channel phase difference parameter encoding apparatus according to claim 8 , wherein the processor being further configured to execute the computer-executable instructions to:
obtain a signal type of a third frame of the audio signal, wherein the first frame is subsequent to the third frame in time domain;
obtain a third IPD parameter encoding scheme of the third frame; and
determine, based on the signal type of the first frame, the signal type of the third frame, the third IPD parameter encoding scheme and the first IPD parameter encoding scheme, the second IPD parameter encoding scheme.

10. The inter-channel phase difference parameter encoding apparatus according to claim 9 , wherein:
when the signal type of the first frame is not the music type, the signal type of the third frame is the music type, the third IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, and the first IPD parameter encoding scheme is the first preset IPD parameter encoding scheme, the second IPD parameter encoding scheme is the second preset IPD parameter enco

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhang Xingtao
• Li Haiting
• Liu Zexin
• Miao Lei

Classifications

• H04S2420/03

  Application of parametric coding in stereophonic audio systems · CPC title

• H04S2400/03

  Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1 (H04S2400/01 takes precedence) · CPC title

• H04S3/008

  in which the audio signals are in digital form, i.e. employing more than two discrete digital channels (data reduction aspects thereof based on psychoacoustics G10L19/02) · CPC title

• G10L19/032

  Quantisation or dequantisation of spectral components · 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