FM调制解调，以余弦信号作为调制信号，较好的程序供大家参考哦-FM modulation and demodulation, cosine signal as a modulated signal, better procedures for your reference Oh

此程序是对线性调频信号进行的仿真，并在此基础上进行解调，画出了解调后的幅度谱。很适合对线性调频信号进行理解和研究。-This program is a simulation of the linear FM signal, and demodulates this basis, draw about the amplitude modulation spectrum. It is suitable for linear FM signals understanding and research.