循环AMDF及其语音基音周期估计算法.pdf

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第 6 期电子学报 Vol. 31 No. 6

2003 年 6 月 ACTA ELECTRONICA SINICA June 2003
循环 AMDF 及其语音基音周期估计算法
张文耀,许刚,王裕国
(中国科学院软件研究所,北京 100080)
摘要: 基音周期是语音压缩、合成以及识别中的一个重要参数. 传统的基于 AMDF 的基音估计算法容易导致
估计的基音周期加倍. 本文针对该现象,分析了 AMDF 函数的特性及其用于基音检测时存在的不足,提出了新的
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CAMDF 函数. CAMDF 有效地克服了 AMDF 函数的不足,简化了基音检测过程. 在此基础上,本文给出了新的基于
CAMDF 的基音检测算法. 该算法不仅简化了基音检测过程,而且降低了误判率,提高了估计精度. 大量实验表明其性
能优于其它 AMDF 或 LVAMDF 的方法.
关键词: 平均幅度差函数; 循环平均幅度差函数; 基音周期估计
中图分类号: TN912 文献标识码: A 文章编号: 0372 2112 (2003) 06 0886 05
Circular AMDF and Pitch Estimation Ba sed on It
ZHANG Wen yao ,XU Gang ,WANG Yu guo
( Institute of Software , Chinese Academy of Sciences , Beijing 100080 , China)
Abstract : Pitch period is a key parameter in pression ,synthesis and recognition. The well known AMDF is often
used to determine this parameter. But it is easy to make the estimated pitch doubled. With the problem ,this paper analyses the features
of the AMDF and its disavantages that occur in pitch detection. And a new function , Circular AMDF(CAMDF) ,is proposed. The
CAMDF conquers the defect of the AMDF effectively ,and simplifies the process of pitch detection. With the properties of CAMDF ,a
new pitch detection algorithm based on CAMDF is described. The algorithm not only simplifies the pitch detection ,but also effciently
decreases the estimation errors and improves the precision