高性能汉语语音基音周期估计

High Performance Mandarin Pitch Estimation

精确度、连续性和可靠性是语音基音分析中必须考虑的三个主要问题．为解决这些问题，本文提出一种新的汉语语音基音周期估计方法．首先，我们通过以ＬＶＡＭＤＦ（ＬｅｎｇｔｈＶａｒｉｅｄＡＭＤＦ）方法替代ＡＭＤＦ方法获得了更好的基音估计精度和时域分辨度；其次，我们根据汉语语音的特点提出了元音清晰度的概念．在ＬＶＡＭＤＦ和元音清晰度的基础上，本文设计了元音中心定位、基音谐波单周期校正、基音邻近搜索等一系列算法，从而大大提高了汉语语音基音估计的精确度。

Accuracy,continuity and stability are the main problems in speech pitch analysis.In this paper,a new Mandarin pitch contour estimation methodlogy is proposed.First,AMDF is substituted by LVAMDF (Length Varied AMDF)for higher accuracy and better time resolution.Second,the concept of Vowel Clarity is introduced according to the characteristics of Mandarin speech signals.Based on LVAMDF and Vowel Clarity,a series of methodologies are developed,including Vowel Center Location,Multi period to Single period Pitch Adjustment,Pitch Neighborhood Searching,etc.,which has gained much higher accuracy,continuity and stability than standard Mandarin pitch estimation methods.