一种用于语音编码的快速自适应码书搜索算法

计算机工程与应用 ›› 2007, Vol. 43 ›› Issue (15): 69-71.

一种用于语音编码的快速自适应码书搜索算法

王艳，黄建国，李钒

西北工业大学航海学院，西安 710072

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-05-21 发布日期:2007-05-21
通讯作者: 王艳

Fast search algorithm of adaptive code-book for speech coding

WANG Yan，HUANG Jian-guo，LI Fan

College of Marine，Northwestern Polytechnical University，Xi’an 710072，China

Received:1900-01-01 Revised:1900-01-01 Online:2007-05-21 Published:2007-05-21
Contact: WANG Yan

摘要/Abstract

摘要： 码激励线性预测技术（简称CELP）能够在低比特率的情况下实现较高质量的语音，但其运算复杂度高。自适应码书搜索替代长时预测，是大多CELP编码方案的关键。介绍了CELP的基本原理并讨论了自适应码书搜索算法，提出将一种快速自适应码书搜索算法引入到传统4.8 kbp FS1016使其复杂度明显降低。仿真结果表明，该方法既保持了4.8 kbs FS1016传统算法复原语音的质量，又使自适应码书搜索运算量下降约40％以上。

关键词: 码激励线性预测技术, 4.8 kbp FS1016, 长时预测器, 快速自适应码书搜索算法

Abstract: Code Excited Linear Prediction（CELP） can provide high voice quality at low bit rates，but it has high computational complexity.Adaptive code-book search plays an important role in most CELP by replacing long-term prediction.In this paper a new adaptive code-book search algorithm is applied for the conventional algorithm of 4.8 kbp FS1016 and the new algorithm can significantly simplify the computation of code-book search.

Key words: Code Excited Linear Prediction（CELP）, 4.8 kbp FS1016, long-term prediction, fast search algorithm of adaptive code-book

王艳，黄建国，李钒. 一种用于语音编码的快速自适应码书搜索算法[J]. 计算机工程与应用, 2007, 43(15): 69-71.

WANG Yan，HUANG Jian-guo，LI Fan. Fast search algorithm of adaptive code-book for speech coding[J]. Computer Engineering and Applications, 2007, 43(15): 69-71.