Encoding method and encoder for multi-channel audio signal, and decoding method and decoder for multi-channel audio signal

Patent metadata

Field	Value
Publication number	US-11328734-B2
Application number	US-202016735522-A
Country	US
Kind code	B2
Filing date	Jan 6, 2020
Priority date	Dec 31, 2014
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

An encoding method for a multi-channel audio signal, an encoding apparatus for performing the encoding method, and a decoding method for a multi-channel audio signal and a decoding apparatus for performing the decoding method are disclosed. A method and apparatus of bypassing an MPEG Surround (MPS) standard operation and using an arbitrary tree when a number of audio signals of N channels exceeds a channel number defined in an MPS standard, is disclosed.

First claim

What is claimed is:

1. An encoding method for a multi-channel audio signal, the method comprising:
generating, by a MPS (MPEG Surround) encoder, audio signals of N/2 channels by downmixing audio signals of N channels; and
converting, by a sampling rate converter, a sampling rate with respect to an audio signal,
performing encoding, by a USAC (Unified Speech and Audio Codec) encoder, with respect to a core band of the audio signals of the N/2 channels,
generating the audio signals of the N/2 channels by downmixing the audio signals of the N channels based on N−N/2−N configuration, when N exceeds predetermined M,
wherein the sampling rate converter converts the sampling rate of the audio signal according to a bit rate to be applied to the USAC encoder.

2. The encoding method of claim 1 , wherein the generating of the audio signals of the N/2 channels comprises generating the audio signals of the N/2 channels by downmixing the audio signals of the N channels using N/2 two-to-one (TTO) coding modules.

3. A decoding method for a multi-channel audio signal, the method comprising:
performing, by a USAC (Unified Speech and Audio Codec) decoder, decoding with respect to a core band of audio signals of N/2 channels; and
converting, by a sampling rate converter, a sampling rate with respect to an audio signal,
generating, by a MPS (MPEG Surround) decoder, audio signals of N channels by upmixing the audio signals of the N/2 channels,
wherein the generating of the audio signals of the N channels comprises:
generating the audio signals of the N channels by upmixing the audio signals of the N channels based on N−N/2−N configuration, when N exceeds a specific M,
wherein the sampling rate converter converts the sampling rate of the audio signal according to a bit rate to be applied to the USAC decoder.

4. The decoding method of claim 3 , wherein the generating of the audio signals of the N channels comprises generating of the audio signals of the N channels by upmixing the audio signals of the N/2 channels using N/2 One-To-Two (OTT) coding modules.

5. A decoding apparatus for a multi-channel audio signal, the apparatus comprising:
a USAC (Unified Speech and Audio Codec) decoder configured to perform decoding with respect to a core band of audio signals of N/2 channels; and
a sampling rate converter configured to convert a sampling rate of the audio signal,
a MPS (MPEG Surround) decoder configured to generate audio signals of N channels by upmixing the audio signals of the N/2 channels,
wherein the MPS decoder is configured to generate the audio signals of the N channels by upmixing the audio signals of the N channels based on N−N/2−N configuration, when N exceeds a specific number,
wherein the sampling rate converter converts the sampling rate of the audio signal according to a bit rate to be applied to the USAC decoder.

6. The decoding apparatus of claim 5 , wherein the MPS decoder is configured to generate the audio signals of the N channels by upmixing the audio signals of the N/2 channels using N/2 one-to-two (OTT) coding modules.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Beack Seung Kwon
• Seo Jeong Il
• Sung Jong Mo
• Lee Tae Jin
• Choi Jin Soo

Classifications

• G10L19/24 Primary

  Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding · 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

• 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

• 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

• H04S2400/01

  Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved · CPC title