Time-domain stereo parameter encoding method and related product

Patent metadata

Field	Value
Publication number	US-12175987-B2
Application number	US-202318339062-A
Country	US
Kind code	B2
Filing date	Jun 21, 2023
Priority date	Aug 10, 2017
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A time-domain stereo parameter encoding method and a related product are provided. The time-domain stereo parameter encoding method includes: determining a channel combination scheme for a current frame; determining a time-domain stereo parameter of the current frame based on the channel combination scheme for the current frame; and encoding the determined time-domain stereo parameter of the current frame, where the time-domain stereo parameter includes at least one of a channel combination ratio factor or an inter-channel time difference.

First claim

What is claimed is:

1. A time-domain stereo parameter encoding method, comprising:
determining a channel combination scheme for a current frame of an audio signal, wherein the channel combination scheme for the current frame is one of a plurality of channel combination schemes, wherein different channel combination schemes have different time-domain downmix processing manners; wherein the plurality of channel combination schemes comprise an anticorrelated signal channel combination scheme and a correlated signal channel combination scheme, the correlated signal channel combination scheme is a channel combination scheme corresponding to a near in phase signal, and the anticorrelated signal channel combination scheme is a channel combination scheme corresponding to a near out of phase signal; wherein the near in phase signal includes a stereo signal whose phase difference between left and right channel signals is relatively closer to 0 degree than to 180 degrees, and wherein the near out of phase signal includes a stereo signal whose phase difference between left and right channel signals is relatively closer to 180 degrees than to 0 degree;
determining a time-domain stereo parameter of the current frame based on the channel combination scheme for the current frame; and
encoding the determined time-domain stereo parameter of the current frame, wherein the time-domain stereo parameter comprises at least one of a channel combination ratio factor;
wherein the determining a time-domain stereo parameter of the current frame based on the channel combination scheme for the current frame comprises:
obtaining a reference channel signal in the current frame satisfies

mono_i
⁢

(
n
)

=

x
L
′

(
n
)

-

x
R
′

(
n
)

2

,

 wherein mono_i(n) represents the reference channel signal in the current frame, x L ′(n) represents a left channel signal that has undergone delay alignment in the current frame, and x R ′(n) represents a right channel signal that has undergone delay alignment in the current frame;
obtaining an amplitude correlation parameter between the left channel signal and the reference channel signal in the current frame satisfies

corr_LM
=

∑

n
=
0

N
-
1

❘
"\[LeftBracketingBar]"

x
L
′

(
n
)

❘
"\[RightBracketingBar]"

*

❘
"\[LeftBracketingBar]"

mono_i
⁢

(
n
)

❘
"\[RightBracketingBar]"

∑

n
=
0

N
-
1

❘
"\[LeftBracketingBar]"

mono_i
⁢

(
n
)

❘
"\[RightBracketingBar]"

*

❘
"\[LeftBracketingBar]"

mono_i
⁢

(
n
)

❘
"\[RightBracketingBar]"

,

 wherein corr_LM represents the amplitude correlation parameter between the left channel signal and the reference channel signal in the current frame;
obtaining an amplitude correlation parameter between the right channel signal and the reference channel signal in the current frame satisfies

corr_RM
=

∑

n
=
0

N
-
1

❘
"\[LeftBracketingBar]"

x
R
′

(
n
)

❘

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Haiting
• Wang Bin
• Miao Lei

Classifications

• G10L19/22

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

• G10L25/03 Primary

  characterised by the type of extracted parameters · CPC title

• G10L19/18

  Vocoders using multiple modes · 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