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Registered An Efficient Pulse Replacement Method for Fixed Codebook Search of ACELP Speech C odec

ACELP 음성 부호화기의 고정 코드북 검색을 위한 효율적인 펄스 교체 방식
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Inventors
Lee Eung Don, Do Young Kim
Application No.
12767271 (2010.04.26)
Publication No.
20100211386 (2010.08.19)
Registration No.
8185385 (2012.05.22)
Country
UNITED STATES
Project Code
02MT2100, Development of Next Generation High-Quality VolP Core Technology, Kim Bong Tae
Abstract
The present research can decrease the amount of computation and enhance speech quality by using a global pulse replacement method in a fixed codebook search. The fixed codebook search method in a speech encoder based upon global pulse replacement, includes the steps of: (a) computing absolute values of the pulse-position likelihood-estimator vectors; (b) temporarily obtaining a codebook vector; (c) computing a mathematical equation by replacing a pulse; (d) determining whether a value computed based upon the mathematical equation is increased after pulse replacement; (e) obtaining a new codebook vector by replacing the pulse; and (f) maintaining a previous codebook vector.
KSP Keywords
Codebook search, Fixed codebook, Mathematical equation, Replacement method, search method, speech quality