# US 12,190,895 B2 · Methods and devices for joint multichannel coding

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- Number: US 12,190,895 B2
- Document ID: US12190895B2
- Status: Granted
- Kind: B2
- Application number: 18/459,907
- Filed: 2023-09-01
- Published: 2024-02-22
- Granted: 2025-01-07
- Earliest claimed: 2013-09-12
- Assignees: Dolby International AB
- Applicants: Dolby International AB
- Inventors: Kristofer Kjoerling; Harald Mundt; Heiko Purnhagen
- Web page: https://patentgrep.com/patent/US12190895B2

## CPC

- G10L 19/008: Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING

## Abstract

Encoding and decoding devices for encoding the channels of an audio system having at least four channels are disclosed. The decoding device has a first stereo decoding component which subjects a first pair of input channels to a first stereo decoding, and a second stereo decoding component which subjects a second pair of input channels to a second stereo decoding. The results of the first and second stereo decoding components are crosswise coupled to a third and a fourth stereo decoding component which each performs stereo decoding on one channel resulting from the first stereo decoding component, and one channel resulting from the second stereo decoding component.

## Claims

### Claim 1

A method for decoding a bit stream comprising M input audio channels, wherein M is at least 3, the method comprising:
extracting side information from the bit stream;
stereo decoding a first pair of audio channels based on the side information, from the M input audio channels; so as to obtain two stereo decoded audio channels, wherein the two stereo decoded audio channels combined with M−2 of the input audio channels not included in the first pair of audio channels form a first set of M audio channels; and
stereo decoding a second pair of audio channels so as to obtain two additional stereo decoded audio channels, wherein the two additional stereo decoded audio channels, together with the M−2 of the audio channels, form a second set of M audio channels.

### Claim 2 (depends on 1)

A computer program product comprising a non-transitory computer-readable medium with instructions for performing a method in accordance with claim 1.

### Claim 3

An apparatus for decoding a bit stream comprising M input audio channels, wherein M is at least 3, the apparatus comprising:
an extractor for extracting side information from the bit stream;
a stereo decoder configured to stereo decode a first pair of audio channels based on the side information, from the M input audio channels; so as to obtain two stereo decoded audio channels, wherein the two stereo decoded audio channels combined with M−2 of the input audio channels not included in the first pair of audio channels form a first set of M audio channels, the stereo decoder further configured to stereo decode a second pair of audio channels so as to obtain two additional stereo decoded audio channels, wherein the two additional stereo decoded audio channels, together with the M−2 of the audio channels, form a second set of M audio channels.