关键词: 基频检测, 小波去噪, 归一化AMDF

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