基于过零点间时间间隔对P，T，K，Z，ZH，H等六个声母的识别

Recognition of six Chinese consonants (P, T, K, ZH, Z,H )based on the gap in zero-crossings

语音波形过零率是一个很重要的语音特征．它通常是语音端点判别和音素粗分类的基本要素．但是，它也有不稳定的一面，所以很少看到有人将它用到语音细分类和识别中．本文提出了把一串过零点间时间间隔作为辨认普通话声母的语音特征的方法．本文做了以过零点间时间间隔作为ＨＭＭ的输入符号，对送气塞音类声母Ｐ、Ｔ、Ｋ，不送气塞擦音Ｚ、ＺＨ和喉擦音Ｈ等六个声母进行辨认实验．在连机的环境下，我们取得７８％的声母正确辨认率．以过零点间时间间隔作为语音特征的优点是计算简单，易于实现．此外，它可以不经转换直接作为离散ＨＭＭ的输入符号．本文介绍过零点间时间间隔的计算方法和使用ＨＭＭ对上述六个声母进行识别的实验过程．

Zero-crossing rate is an important feature in speech recognition.However,this feature is unreliable in the computation. A conversion of the feature into the gap in zero-crossingis proposed to recognize Putonghua initials by HMM in this paper. A study of the on-linerecognition of Putonghua voiceless aspirated stops P, T, K,and affricates ZH, Z and glottalfricative H has been done with a correct recognition rate about 78%. The technique used toimplement the proposal and the experiment of the initial recognition are described in this paper.