【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 .更多还原

【Abstract】 Pitch period is a key parameter in speech compression,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 of estimated values.Lots of experiment show that the performance of the algorithm is better than other methods that are based on the AMDF or the LVAMDF.更多还原