Speech encoder function of speech coder's main function is to make the user voice PCM (pulse code modulation) sample value encoded in a small number of bits (frame), this method makes the voice on the way to produce error, network jitter and sudden transmission has Robustness (Robustness), at the receiving end, voice frame was error for PCM voice sample values, and then converts voice waveform, the classification of the speech coder speech coder is divided into three kinds: waveform encoding; Vocoder. Hybrid encoder, waveform encoder will compose out as much as possible, including background noise simulation waveform, due to the effects on the waveform encoder input signal, therefore can produce high quality sample value, however, the waveform encoder work at high bit rates, for example: itu-t g. 711 specification (PCM) with the bit rate of 64 KBPS,
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