论文部分内容阅读
随着VoIP技术在近年来的快速发展,互联网语音通信得到了越来越多的应用,IP电话的语音通信质量成为制约其发展的重要因素,因此应用了许多新技术使其语音质量更符合用户的要求。在VoIP系统中使用语音增强算法,可以消除发送端噪声干扰,提高通话质量。研究的Speex算法中的STSA-MMSE语音增强算法是在计算先验和后验信噪比的基础上估计噪声,再通过计算得出一个增益值,作用于带噪语音,对噪声段进行抑制,对叠加了噪声的语音尽可能分离噪声,最终达到增强语音清晰度,提高语音舒适度的目的。
With the rapid development of VoIP technology in recent years, more and more applications of Internet voice communication have become more and more important. As a result, voice communication quality of IP telephones has become an important factor restricting its development. Therefore, many new technologies are applied to make voice quality more consistent with users Request. Voice enhancement algorithms are used in VoIP systems to eliminate the noise on the sending end and improve the quality of calls. The STSA-MMSE speech enhancement algorithm in the Speex algorithm under study is to estimate the noise based on the calculation of the a priori and the posteriori signal-to-noise ratio, and then a gain value is calculated, which is applied to the noisy speech and the noise segment is suppressed, Noise superimposed on the noise as much as possible to achieve the ultimate goal of enhancing voice clarity, improve voice comfort.