频谱分析仪作业，照着下载的资料做的，功能都可以实现，录音时如果信号不满足过零检测法的条件会出现错误，如果可以的话自己录制声音。-Spectrum analyzer operation, done according to the downloaded data, functions can be achieved, recording zero if the signal does not meet the conditions of detection error, if possible, record their own voice.