Multi-channel signal encoding method and encoder

Patent metadata

Field	Value
Publication number	US-11935548-B2
Application number	US-202117408116-A
Country	US
Kind code	B2
Filing date	Aug 20, 2021
Priority date	Aug 10, 2016
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A multi-channel signal encoding method includes obtaining a multi-channel signal of a current frame; determining an initial multi-channel parameter of the current frame; determining a difference parameter based on the initial multi-channel parameter of the current frame and multi-channel parameters of previous K frames of the current frame, where the difference parameter represents a difference between the initial multi-channel parameter of the current frame and the multi-channel parameters of the previous K frames, and K is an integer greater than or equal to one; determining a multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and encoding the multi-channel signal based on the multi-channel parameter of the current frame.

First claim

What is claimed is:

1. A non-transitory computer-readable storage medium storing computer instructions that, when executed by one or more processors, cause the one or more processors to:
obtain a first multi-channel signal of a current frame;
obtain a first multi-channel parameter of the current frame;
obtain a difference parameter based on the first multi-channel parameter and second multi-channel parameters of previous K frames of the current frame, wherein the difference parameter represents a difference between the first multi-channel parameter and the second multi-channel parameters, and wherein the K is an integer greater than or equal to one;
obtain a third multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and
encode the first multi-channel signal based on the third multi-channel parameter.

2. The non-transitory computer-readable storage medium of claim 1 , wherein the computer instructions, when executed by the one or more processors, further cause the one or more processors to obtain the third multi-channel parameter based on the characteristic parameter of the current frame when the difference parameter satisfies a first preset condition.

3. The non-transitory computer-readable storage medium of claim 2 , wherein the difference parameter comprises:
an absolute value of a difference between the first multi-channel parameter and a fourth multi-channel parameter of a previous frame of the current frame when the first preset condition comprises that the difference parameter is greater than a preset first threshold; or
a product of the first multi-channel parameter and the fourth multi-channel parameter when the first preset condition comprises that the difference parameter is less than or equal to zero.

4. The non-transitory computer-readable storage medium of claim 2 , wherein the computer instructions, when executed by the one or more processors, further cause the one or more processors to obtain the third multi-channel parameter based on a correlation parameter of the current frame, and wherein the correlation parameter represents a degree of correlation between the current frame and a previous frame of the current frame.

5. The non-transitory computer-readable storage medium of claim 4 , wherein the computer instructions, when executed by the one or more processors, further cause the one or more processors to obtain the correlation parameter based on a first target channel signal in the first multi-channel signal and a second target channel signal in a second multi-channel signal of the previous frame of the current frame.

6. The non-transitory computer-readable storage medium of claim 5 , wherein the computer instructions, when executed by the one or more processors, further cause the one or more processors to obtain the correlation parameter based on a first frequency domain parameter of the first target channel signal and a second frequency domain parameter of the second target channel signal, and wherein the first frequency domain parameter is at least one of a frequency domain amplitude value or a frequency domain coefficient of the first target channel signal.

7. The non-transitory computer-readable storage medium of claim 4 , wherein the computer instructions, when executed by the one or more processors, further cause the one or more processors to obtain the correlation parameter based on a pitch period of the current frame and a pitch period of the previous frame.

8. The non-transitory computer-readable storage medium of claim 2 , wherein the computer instructions, when executed by the one or more processors, further cause the one or more processors to obtain the first multi-channel parameter based on fourth multi-channel parameters of previous T frames of the current frame when the characteristic parameter of the current frame satisfies a second preset condition, and wherein the T is an integer greater than or equal to one.

9. The non-transitory computer-readable storage medium of claim 8 , wherein the computer instructions, when executed by the one or more processors, further cause the one or more processors to:
obtain the fourth multi-channel parameters as the third multi-channel parameter when the T is equal to one; and
obtain the third multi-channel parameter based on a change trend of the fourth multi-channel parameters when the T is greater than or equal to two.

10. The non-transitory computer-readable storage medium of claim 8 , wherein the characteristic parameter of the current frame comprises at least one of a correlation parameter or a peak-to-average ratio parameter of the current frame, wherein the correlation parameter represents a degree of correlation between the current frame and a previous frame of the current frame, wherein the peak-to-average ratio parameter represents a peak-to-average ratio of a signal of at least one channel in the first multi-channel signal, and wherein the second preset condition is that the characteristic parameter is greater than a preset threshold.

11. A computer program product comprising instructions that are stored on a non-transitory computer-readable medium and that, when executed by one or more processors, cause an audio signal encoder to:
obtain a first multi-channel signal of a current frame;
obtain a first multi-channel parameter of the current frame;
obtain a difference parameter based on the first multi-channel parameter and second multi-channel parameters of previous K frames of the current frame, wherein the difference parameter represents a difference between the first multi-channel parameter and the second multi-channel parameters, and wherein the K is an integer greater than or equal to one;
obtain a third multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and
encode the first multi-channel signal based on the third multi-channel parameter.

12. The computer program product of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the audio signal encoder to obtain the third multi-channel parameter based on the characteristic parameter of the current frame when the difference parameter satisfies a first preset condition.

13. The computer program product of claim 12 , wherein the difference parameter comprises:
an absolute value of a difference between the first multi-channel parameter and a fourth multi-channel parameter of a previous frame of the current frame when the first preset condition comprises that the difference parameter is greater than a preset first threshold; or
a product of the first multi-channel parameter and the fourth multi-channel parameter when the first preset condition comprises that the difference parameter is less than or equal to zero.

14. The computer program product of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the audio signal encoder to obtain the third multi-channel parameter based on a correlation parameter of the current frame, and wherein the correlation parameter represents a degree of correlation between the current frame and a previous frame of the current frame.

15. The computer program product of claim 14 , wherein the instructions, when executed by the one or more processors, further cause the audio signal encoder to obtain the correlation parameter based on a first target channel signal in the first multi-channel signal and a second target channel signal in a second multi-channel signal of the previous frame of the current frame.

Assignees

• Huawei Tech Co Ltd

Inventors

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

Classifications

• 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

• G10L19/022

  Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring · CPC title

• G10L19/032

  Quantisation or dequantisation of spectral components · CPC title

• G10L25/03

  characterised by the type of extracted parameters · CPC title

• H04S3/00

  Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence) · CPC title