Focused search method of fixed codebook and apparatus thereof

Details Focused search method of fixed codebook and apparatus thereof Focused search method of fixed codebook and apparatus thereof

2007-11-27

2007-11-27

Chawan, Vijay (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S219000, C704S223000, C704S230000, C704S229000

Reexamination Certificate

active

10712336

ABSTRACT:
There are provided a search method of a fixed codebook, and more particularly, a focused search method and apparatus thereof, for being applied to a speech codec for Voice over Internet Protocol (VoIP). The focused search method of the fixed codebook includes: calculating absolute values of correlation vectors of respective pulse locations of tracks 0, 1, 2, and 3 and arranging the pulse locations in a descending order of the absolute values; and selecting a predetermined number of pulse locations for each track among candidate pulse locations arranged and conducting focused search of the selected result. Therefore, it is possible to significantly reduce a calculation amount required for fixed codebook search while maintaining tone quality in a similar level.

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Proceedings of ICSP '98, “An 8-kb/s Conjugate-structure Algebraic CELP (CS-ACELP Speech Coding”, L. Juan, et al., 4 pages.
International Telecommunication Union, Coding of Speech At 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP), 35 pages.

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