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基于DWT的AMDF基音检测改进算法

Keywords: 基音,离散小波变换,平均幅度差函数,下降趋势

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Abstract:

平均幅度差函数(AMDF)法是一种常用的基音检测算法,但由于AMDF存在严重的均值下降趋势,使得用这种算法在提取基音的过程中易产生错误.为克服该缺点,提出了一种基于离散小波变换(DWT)的AMDF改进算法(DW?AMDF),该算法首先求取每帧浊音信号的AMDF,利用DWT提取出AMDF中的下降趋势,去除下降趋势后得到DW?AMDF用于检测基音.实验结果表明,与传统的AMDF算法及其几种典型的改进算法相比,该算法的检测精度有了明显的提高.

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