NZ562186A

5G,4G,3G

Title

Method and apparatus for split-band encoding of speech signals

Application Number:

NZ20060562186

Publication Date:

26-03-2010

Current Assignee:

NOT AVAILABLE

Family ID:

36588741

Application Date:

03-04-2006

Declaring Company:

QUALCOMM INC

Publication Country:

US

Priority Date:

01-04-2005

View on Espacenet goto-link

Title

Method and apparatus for split-band encoding of speech signals

Application Number:

NZ20060562186

Family ID:

36588741

Publication Country:

US

Publication Date:

26-03-2010

Application Date:

03-04-2006

Priority Date:

01-04-2005

Current Assignee:

NOT AVAILABLE

Declaring Company:

QUALCOMM INC

View on Espacenet goto-link

Abstract  Abstract

Disclosed is an apparatus including a filter bank. The filter bank has a lowband processing path which is configured to receive a wide-band speech signal and to produce a lowband speech signal based on a low-frequency portion of the wideband speech signal. The filter bank further includes a highband processing path configured to receive the wideband speech signal and to produce a highband speech signal based on a high-frequency portion of the wideband speech signal. A passband of the lowband processing path overlaps a passband of the highband processing path where the overlap is considered as the distance of the point at which the frequency of the highband filter drops to -20 dB from the point at which the frequency response of the lowband filter drops to -20 dB. The apparatus further includes a first speech encoder configured to encode the lowband speech signal into at least an encoded lowband excitation signal and a plurality of lowband filter parameters. There is also included a second speech encoder configured to generate a highband excitation signal based on the encoded lowband excitation signal and to encode the highband signal according to the highband excitation signal into at least a plurality of highband filter parameters. The apparatus is characterized in that the passband of the lowband processing path overlaps the passband of the highband processing path by 400 to about 1000 Hz.

Note:

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