这是一个DTMF双频拨号信号的生成和检测程序，能够根据输入的电话拨号音检测出号码，并且可以在拨号音中加入噪声和单频干扰-This is the generation and detection program a dual DTMF dialing signals can be detected according to the telephone dial tone number input, and can be added to single-frequency noise and interference in the dial tone