The essence of speech compression is to reduce the rate of digital voice in the case of assuring the quality of voice, therefore reducing the bandwidth occupied by speech signal.
语音压缩的实质就是在保证语音质量的情况下，降低数字化语音的数码率，从而减少数字化语音信号所占用的带宽。
In this design many technologies such as DSP, low bit-rate speech compression, channel multiplexing, Flash Memory and communication with modem through se rial port are used.
设计中采用了DSP、低比特率语音压缩编解码、信道复用、快闪存储、串口和调制解调器通信等技术。
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