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,

由mic录制一段声音，实现其傅立叶变换，可在时域和频域显示波形。-Record a voice from the mic, implementing its Fourier transform, the waveform can be displayed in the time domain and frequency domain.