取自麦克风的声音，然后转化为傅立叶波形输出，有点像以前影碟机里唱歌，显示屏上会有一跳一跳的小光柱，表示不同声音频段-Taken from the sound of the microphone, and then converted to Fourier waveform output bit like DVD players singing, narrow beam of the display will be throbbing different voice band