作者介绍了小波变换用于语音信号基音周期检测的原理，提出了基于小波变换后波形特征的基音提取算法。该算法与原多带激励声码器基音提取算法相比，能有效避开噪声的干扰，正确提取语音的基音，计算复杂度也降低很多 The author introduces the principle of wavelet transform used for pitch detection of speech signals and proposes a pitch extraction algorithm based on waveform features after wavelet transform. Compared with the original multi-band excitation vocoder based pitch-extraction algorithm, this algorithm can effectively avoid the interference of noise and extract the pitch of the speech correctly, and the computational complexity is also reduced