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本文引入子波包算法，在语音信号的子波包子空间里判决语音的基音，从而可以有效避开有色噪声（如低频噪声）等的干扰，正确提取语音的基音。这种方法不仅能提高低速率声码器在无噪环境下的语音质量，而且能在很强的有色噪声环境下保持原有的声码器音质，从而有效地克服低速声码器抗噪能力差的缺点。
In this paper, the wavelet packet algorithm is introduced to determine the pitch of speech in the wavelet sub-space of speech signal, so that the interference of colored noise (such as low-frequency noise) can be effectively avoided and the pitch of speech can be correctly extracted. This method can not only improve the speech quality of low-rate vocoder in no-noise environment, but also keep the original vocoder sound quality in the strong colored noise environment so as to effectively overcome the low-noise vocoder anti-noise ability Poor shortcomings.