基于信道软输出及信源参数相关性的联合语音解码

应用科学学报 ›› 2005, Vol. 23 ›› Issue (3): 240-244.

基于信道软输出及信源参数相关性的联合语音解码

周琳, 吴镇扬

东南大学无线电工程系, 江苏南京 210096

收稿日期:2004-02-27 修回日期:2004-10-01 出版日期:2005-05-31 发布日期:2005-05-31
作者简介:周琳(1978-),女,江苏镇江人,博士生,E-mail:lin-Joe@163.com;吴镇扬(1949-),男,江苏兴化人,教授,博导,E-mail:zhenyang@seu.edu.cn

Joint Speech Decoding Based on Channel Soft-Value and Bayes Estimation

ZHOU Lin, WU Zhen-yang

Department of Radio Engineering, Southeast University, Nanjing 210096, China

Received:2004-02-27 Revised:2004-10-01 Online:2005-05-31 Published:2005-05-31

摘要/Abstract

摘要： 提出一种基于接收端的联合语音解码算法,根据信道或信道解码提供的参数软输出值,以及语音编码参数的冗余量计算接收参数的后验概率;利用后验概率基于MAP或MS准则进行参数估计,最佳估计值进行语音解码.仿真中采用G.711和GSM EFR两种语音编码标准,结果表明联合解码算法显著提高了解码语音信噪比.

关键词: 参数估计, 软输出值, MAP/MS, 冗余量

Abstract: A joint speech-decoding algorithm is proposed in this paper.Based on the soft-value of channel decoder and the redundancy of source parameter, a posterior probability is calculated and used to estimate speech parameter according to MAP/MS criteria.Next the optimal parameter from the estimation model is decoded.Simulation carried our in accordance with G.711 and GSM EFR speech coding standard shows that the joint decoding algorithm obviously improves the SNR of decoded speech.

Key words: soft-value, redundancy, MAP/MS, estimation model

中图分类号:

TM911.22

周琳, 吴镇扬. 基于信道软输出及信源参数相关性的联合语音解码[J]. 应用科学学报, 2005, 23(3): 240-244.

ZHOU Lin, WU Zhen-yang. Joint Speech Decoding Based on Channel Soft-Value and Bayes Estimation[J]. Journal of Applied Sciences, 2005, 23(3): 240-244.

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