摘要
在短延时码本激励线性预测（ＬＤ－ＣＥＬＰ）语音编码方案中，直接用Ｇ．７２８所提供的现成码本对加噪声后的语音信号进行编解码时，效果不好。作者利用ＬＢＧ算法训练了自己的码本，并利用此码本对加噪声后的语音信号进行编解码，取得了良好的效果，使主观感觉质量变好，信噪比提高了约３ｄＢ。
In the Low delay Code Excited Linear Predictive (LD CELP) coding, the direct use of the code provided by the G.728 yields bad results in encoding and decoding the noise added speech signals.The anthor has designed a new code using the LBG algorithm.This code,when used to encode and decode noise added speech signals, can produce good results, improving the perceptual quality and raising the SNR by about 3dB.
出处
《重庆邮电学院学报（自然科学版）》
1997年第3期31-33,30,共4页
Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition)
关键词
短延时
码本激励
线性预测
语音编码
low delay, code excited linear predictive, LBG algorithm, perceptual quality
