Speech coding of principal-component channels for deleting redundant inter-channel parameters

Patent metadata

Field	Value
Publication number	US-8942989-B2
Application number	US-201013518537-A
Country	US
Kind code	B2
Filing date	Dec 27, 2010
Priority date	Dec 28, 2009
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

Disclosed is an audio encoding device which removes unnecessary inter-channel parameters from the subject to be encoded, improving the encoding efficiency thereby. In this audio encoding device, a principal component analysis unit ( 301 ) converts an inputted left signal {L sb (f)} and an inputted right signal {R sb (f)} into a principal component signal {PC sb (f)} and an ambient signal {A sb (f)} and calculates for each sub-band, a rotation angle which indicates the degree of conversion; a monophonic encoding unit ( 303 ) encodes the principal component signal {Pc sb (f)}; a rotation angle encoding unit ( 302 ) encodes the angle of rotation {θ b }; a local monophonic decoding unit ( 603 ) creates a decoded principal component signal; and a redundant parameter elimination unit ( 604 ) identifies the redundant parameters by analyzing the encoding quality of the decoded principal component signal and eliminates the redundant parameters from the signal to be encoded.

First claim

The invention claimed is:

1. A speech coding apparatus, comprising:
a transforming section, using a communication apparatus, that transforms input speech signals of a plurality of channels into principal-component signals, and calculates an inter-channel parameter every subband, the inter-channel parameter representing a relationship of inter-channel signals;
a first coding section, using the communication apparatus, that encodes the principal-component signal to obtain a coded…

Assignees

• Liu Zongxian
• Chong Kok Seng
• Panasonic Ip Corp America

Inventors

• Liu Zongxian
• Chong Kok Seng

Classifications

• G10L19/008 Primary

  Physics · mapped topic

• G10L19/0204

  Physics · mapped topic