中文说明：
此代码仿真了一个语音输入输出系统，语音信号经过AD转换后，经过DSSS调制解调后，通过DA转换还原输入的声音，每一步的的波形都可以观测，对实际DSSS系统设计有很大的参考价值
English Description：
This code simulates a voice input and output system. After AD conversion, the voice signal is modulated and demodulated by DSSS, and the input sound is restored through DA conversion. The waveform of each step can be observed, which has great reference value for the design of actual DSSS system