ACELP 음성 부호화기의 고정 코드북 검색을 위한 효율적인 펄스 교체 방식
- 8185385 (2012.05.22)
02MT2100, 차세대 고품질 VoIP 핵심 원천기술,
- 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 제안 키워드
- Codebook search, Fixed codebook, Mathematical equation, Replacement method, search method, speech quality