一种基于VoIP的改进WSOLA丢包隐藏算法

摘要

The packet loss phenomenon has seriously affected the calling voice quality of VoIP.WSOLA algorithm is a receiving end-based packet loss concealment method,it can better improve the voice quality.This paper introduces the principle of WSOLA algorithm,and based on that it proposes an improved method for cross correlation coefficient calculation to solve the problem that the calculation load of cross correlation coefficient in WSOLA is heavy which leads to too much computation delay.In end of the paper the quality of reconstructed voice signal is compared through simulation.%丢包现象严重影响VoIP的通话语音质量。WSOLA（Waveform Similarity Based Overlap-Add）算法是一种基于接收端的丢包隐藏方法，可以较好地提高语音质量。在介绍WSOLA 算法原理的基础上，针对该算法中计算互相关系数所需计算量较大，会增加过多计算延时的问题，提出一种互相关系数计算的改进方法。最后通过仿真对重建语音信号质量进行了对比。