访真了高频系统的调制解调，并有波形显示，-visit to a real system of high frequency modulation and demodulation, and waveform display,

一个音频播放同时显示波形的代码，可以学习傅里叶变换过程，通过处理音频数据，整个程序以类的形式进行封装-An audio playback simultaneously display code waveform can learn Fourier transform process, by processing audio data, the entire program in the form of class encapsulates