说明：  一个用python开发的音频信号采集与分许程序，主要功能是：用计算机声卡采集数据；对信号进行傅里叶变换；原始信号和信号频谱图形显示。
(A the python the developed audio signal acquisition Xu program, the main function: collecting data with a computer sound card Fourier transform of the signal graphical display of original signal and the signal spectrum.)