监听输入音频并利用FFT算法计算出其频谱-This article shows how to use a Fast Fourier Transform (FFT) algorithm to calculate the fundamental frequency of a captured audio sound.

双音多频信号，根据输入的音频信号判断实际对应的数字-Dual tone multi-frequency signal, the audio signal is determined based on the actual input of the corresponding number

使用混沌与分形分析的例程，音频信号通过LM386放大，matlab程序运行时导入数据文件作为输入参数。- Use Chaos and fractal analysis routines, LM386 audio signal amplification, Import data files as input parameters matlab program is running.