Method and apparatus for searching for combined fixed...

Details Method and apparatus for searching for combined fixed... Method and apparatus for searching for combined fixed...

2003-09-24

2009-02-24

Armstrong, Angela A (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S220000, C704S223000

Reexamination Certificate

active

07496504

ABSTRACT:
Provided are a combined, fixed codebook searching method and apparatus used in a code excited linear prediction (CELP) speech codec. The method is used in a code excited linear prediction (CELP) speech codec, and includes searching for a fixed codebook using a full search method that searches for the fixed codebook at all pulse positions; selecting a fixed codebook searching method by counting the number of users who are accessing a gateway, comparing the number of users with a predetermined threshold, and selecting a proper fixed codebook searching method based on the result of comparison; searching for the fixed codebook using the selected fixed codebook searching method; and checking whether the search for the fixed codebook is complete for all tracks of the CELP speech codec, terminating a routine of searching for the fixed codebook when it is determined the search is complete for all the tracks, and selecting a fixed codebook searching method again in consideration of the number of gateway users when there remains a track to be searched for. Accordingly, a fixed codebook searching method is selected in consideration of the number of users who are accessing a gateway, thereby enabling an effective adjustment of either the quality of sound or the channel capacity of the gateway.

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Lan Juan et al.;“An 8-kb/s Conjugate-structure Algebraic CELP (CS-ACELP) Speech Coding”; Proceedings of ICSP '98; pp. 1729-1732, 1998.
Int'l Telecommunication Union (ITU-T) Recommendation G.729; “General Aspects of Digital Transmission Systems”/Coding of Speech at 8 kbit/s Using Conjugate-structure Algebraic-code-excited Linear-Prediction (CS-ACELP); pp. 1-35, no date.
Redwan Salami, et al.; ITU-T G.729 Annex A: Reduced Complexity 8 kb/s CS-ACELP Codec for Digital Simultaneous Voice and Data; 1997 IEEE Communications Magazine, Sep. 1997, pp. 56-63.

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