The description precision of the excitation signal greatly influences the quality of reconstructed speech in low bitrate vocoders.
在低速率声码器中，对激励信号的描述直接影响重建语音的质量。
2
In the environment of speech coding application, especially in military applications, the vocoders quality in noisy environment needs to be improved.
在语音编码的应用环境中，特别是在军事应用中，强噪声环境下声码器性能的改进是一个亟待解决的问题。
3
MELP vocoders utilize mixed pulse and noise as the excitation to elimate the buzzes in traditional LPC vocoders, and add a jitter voicing state to overcome the tonal noise.