完成A律解压子函数的编写.并利用任务一的结果,实现音频信号采集压缩和解压回放-A law of decompression to complete the preparation of Functions. And use the results of a task, the realization of audio signal compression and decompression playback Acquisition

低信噪比下的捕获性能仿真，很详细，对于卫星信号的捕获技术学习很有帮助-The capture performance simulation of low SNR is very detailed, and it is helpful for the acquisition of satellite signal.