Encoder and encoding method for multi-channel signal, and decoder and decoding method for multi-channel signal

Patent metadata

Field	Value
Publication number	US-11056122-B2
Application number	US-202016786817-A
Country	US
Kind code	B2
Filing date	Feb 10, 2020
Priority date	Apr 10, 2013
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

An encoder and an encoding method for a multi-channel signal, and a decoder and a decoding method for a multi-channel signal are disclosed. A multi-channel signal may be efficiently processed by consecutive downmixing or upmixing.

First claim

The invention claimed is:

1. A decoding method, the comprising:
outputting, by a core decoding unit, a mono signal having a core band corresponding to a low-frequency band from a bitstream;
generating a stereo signal including a first channel signal and a second channel signal, by a first OTT (one-to-two) upmixing unit, from the mono signal of the core band; and
generating a four-channel signal, by a second OTT upmixing unit and a third OTT upmixing unit, from the stereo signal including the first channel signal and the second channel signal,
wherein the first channel signal of the stereo signal is inputted into the second OTT upmixing unit, the second channel signal of the stereo signal is inputted into the third OTT up mixing unit,
wherein the second OTT upmixing unit and the third OTT upmixing unit generates the four-channel signal from the first channel signal and the second channel signal,
wherein the core band is a low-frequency band except for a high-frequency band,
wherein the high-frequency band is generated by a SBR (spectral band replication) unit.

2. The method of claim 1 , wherein the second OTT upmixing unit and the third OTT upmixing unit is disposed in parallel.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Beack Seung Kwon
• Lee Tae Jin
• Sung Jong Mo
• Seo Jeong Il
• Kang Kyeong Ok
• Jang Dae Young
• Kim Jin Woong

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

• 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