从激光大气语音通信电路设计的角度分析了引起语音传输失真的主要因素：A／D转换器的选择和波特率的设置。实验表明：激光大气语音通信对A／D转换器的转换精度要求较高，即要保证语音通信质量，A／D转换器的转换精度应在8位以上；而对A／D转换器的转换速率要求较低，一般选择8 kHz或10 kHz的采样速率即可；在正确选择编码方式后，波特率设置为大于数字信号传输速率，可保证语音通信质量。

The main factors are analyzed,which causes the speech communication distortion in circuit designing of the laser atmospheric speech communication: the selection of A/D converter and the baud rate setting. In experiments,it is testified that the higher conversion accuracy of A/D converter is required to guarantee the speech communication quality,the A/D conversion accuracy should be more than eight bits,and conversion velocity is relatively lower required,speech singles sampling speed is usually chosen 8 kHz and 10 kHz. When the right coding mode is chosen,baud rate should be set more than digital signals transmission velocity,and the speech communication quality can be guaranteed.