Multi-channel signal encoding method and encoder

Patent metadata

Field	Value
Publication number	US-11133014-B2
Application number	US-201916272397-A
Country	US
Kind code	B2
Filing date	Feb 11, 2019
Priority date	Aug 10, 2016
Publication date	Sep 28, 2021
Grant date	Sep 28, 2021

Abstract

A multi-channel signal encoding method and an encoder, where the 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. Hence, the method and the encoder ensure better accuracy of inter-channel information of a multi-channel signal.

First claim

What is claimed is:

1. A multi-channel signal encoding method, comprising:
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, wherein 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 wherein the 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 of the current frame based on the multi-channel parameter of the current frame.

2. The multi-channel signal encoding method of claim 1 , wherein determining the multi-channel parameter of the current frame comprises determining the multi-channel parameter of the current frame based on the characteristic parameter of the current frame when the difference parameter satisfies a first preset condition.

3. The multi-channel signal encoding method of claim 2 , wherein the difference parameter is calculated as:
an absolute value of a difference between the initial multi-channel parameter of the current frame and a multi-channel parameter of a previous frame of the current frame, and the first preset condition comprises that the difference parameter is greater than a preset first threshold; or
a product of the initial multi-channel parameter of the current frame and the multi-channel parameter of the previous frame of the current frame, and the first preset condition comprises that the difference parameter is less than or equal to zero.

4. The multi-channel signal encoding method of claim 2 , wherein determining the multi-channel parameter of the current frame comprises determining the multi-channel parameter of the current frame 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 multi-channel signal encoding method of claim 4 , further comprising determining the correlation parameter based on a target channel signal in the multi-channel signal of the current frame and a target channel signal in a multi-channel signal of the previous frame of the current frame.

6. The multi-channel signal encoding method of claim 5 , wherein determining the correlation parameter comprises determining the correlation parameter based on a frequency domain parameter of the target channel signal in the multi-channel signal of the current frame and a frequency domain parameter of the target channel signal in the multi-channel signal of the previous frame of the current frame, and wherein a frequency domain parameter is at least one of a frequency domain amplitude value or a frequency domain coefficient of a target channel signal.

7. The multi-channel signal encoding method of claim 4 , further comprising determining the correlation parameter based on a pitch period of the current frame and a pitch period of the previous frame.

8. The multi-channel signal encoding method of claim 2 , wherein determining the multi-channel parameter of the current frame comprises determining the multi-channel parameter of the current frame based on multi-channel parameters of previous T frames of the current frame when the characteristic parameter of the current frame meets satisfies a second preset condition, and wherein the T is an integer greater than or equal to one.

9. The multi-channel signal encoding method of claim 8 , wherein determining the multi-channel parameter of the current frame comprises:
determining the multi-channel parameters of the previous T frames as the multi-channel parameter of the current frame when the T is equal to one; and
determining the multi-channel parameter of the current frame based on a change trend of the multi-channel parameters of the previous T frames when the T is greater than or equal to two.

10. The multi-channel signal encoding method 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 multi-channel signal of the current frame, and wherein the second preset condition is that the characteristic parameter is greater than a preset threshold.

11. An encoder, comprising:
a memory comprising instructions; and
a processor coupled to the memory, wherein the instructions cause the processor to be configured to:
obtain a multi-channel signal of a current frame;
determine an initial multi-channel parameter of the current frame;
determine 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, wherein 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 wherein the K is an integer greater than or equal to one;
determine a multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and
encode the multi-channel signal of the current frame based on the multi-channel parameter of the current frame.

12. The encoder of claim 11 , wherein the instructions further cause the processor to be configured to determine the multi-channel parameter of the current frame based on the characteristic parameter of the current frame when the difference parameter meets satisfies a first preset condition.

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

14. The encoder of claim 12 , wherein the instructions further cause the processor to be configured to determine the multi-channel parameter of the current frame 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 encoder of claim 14 , wherein the instructions further cause the processor to be configured to determine the correlation parameter based on a target channel signal in the multi-channel signal of the current frame and a target channel signal in a multi-channel signal of the previous frame of the current frame.

16. The encoder of claim 15 , wherein the instructions further cause the processor to be configured to determine the correlation parameter based on a frequency domain parameter of the target channel signal in the multi-channel signal of the current fram

Assignees

• Huawei Tech Co Ltd

Inventors

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

Classifications

• H04S2420/01

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• H04S3/00

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

• G10L19/032

  Quantisation or dequantisation of spectral components · CPC title

• G10L19/022

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