Abstract: This paper proposes a pitch detection method for the noisy speech.Firstly，the wavelet transform is used to de-noising the noisy speech，then after the pre-processing，the normalized AMDF is adopted to extract the speech’s fundamental frequencies.During the post-treating，the searching method is used to smooth the fundamental frequencies.Experimental results show the new method has better robust than the traditional method，especially in the low snr.

Key words: pitch detection, wavelet-denoising, normalized AMDF

摘要： 提出一种对含噪语音进行基频检测的新方法。先对含噪语音进行小波去噪，然后再经过预处理后，采用归一化的AMDF算法对语音进行基频提取，后期对基频信号采用搜索试探方法进行平滑处理，通过实验表明，该方法比传统方法有更好的鲁棒性，尤其在低信噪比的情况下。

关键词: 基频检测, 小波去噪, 归一化AMDF