语声中速率多脉冲压缩编码的新方法

New Method of Intermediate Rate Multi-Pulse Compression Coding for Speech

目前,出现了许多新的语音压缩编码技术,其中多脉冲线性预测编码由于考虑了人耳的听觉效应,利用谱逼近准则寻优,获得了良好的语声编码听音效果,因而在中速率语声编码方法中颇受人们重视。本文对多脉冲编码方案提出了几种新的改进方法:去帧间影响效应、残差的峰值逼近多脉冲的方法,线性预测参数的二次寻优、二级多脉冲激励模型法,文献中自相关法公式的修正等。最后给出了实验结果。

At present, many new techniques of speech compression coding have come forth, in which multl-pulse linear prediction coder (MPLPC)algorithm has been paid extensive attention to for its good clearness. This paper will show several new advances of MPLPC for obtaining better performance. They include: the removal of the affection between two adjacent frames, the searching for a few pulses from the residual error, the recursive optimization of LPC parameters, a new two-stage model of MPLPC and the modification of the autocorrelation formula in [3]. Finally, simulation results are given.