Complex-transform channel coding with extended-band frequency coding

Patent metadata

Field	Value
Publication number	US-9105271-B2
Application number	US-90788910-A
Country	US
Kind code	B2
Filing date	Oct 19, 2010
Priority date	Jan 20, 2006
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

An audio encoder receives multi-channel audio data comprising a group of plural source channels and performs channel extension coding, which comprises encoding a combined channel for the group and determining plural parameters for representing individual source channels of the group as modified versions of the encoded combined channel. The encoder also performs frequency extension coding. The frequency extension coding can comprise, for example, partitioning frequency bands in the multi-channel audio data into a baseband group and an extended band group, and coding audio coefficients in the extended band group based on audio coefficients in the baseband group. The encoder also can perform other kinds of transforms. An audio decoder performs corresponding decoding and/or additional processing tasks, such as a forward complex transform.

First claim

We claim:

1. In an audio encoder, a computer-implemented method comprising:
receiving multi-channel audio data, the multi-channel audio data comprising a group of plural source channels;
performing channel extension coding on the multi-channel audio data, the channel extension coding comprising:
encoding a combined channel for the group; and
determining plural parameters for representing individual source channels of the group as modified versions of the encoded combined chan…

Assignees

• Mehrotra Sanjeev
• Chen Wei-Ge
• Microsoft Technology Licensing Llc

Inventors

• Mehrotra Sanjeev
• Chen Wei-Ge

Classifications

• G10L19/008 Primary

  Physics · mapped topic

• G10L21/038 Primary

  Physics · mapped topic

• H03M7/30

  Electricity · mapped topic