内容基于对电话通信系统中拨号音合成与识别的仿真实现。主要涉及到电话拨号音合成的基本原理及识别的主要方法，利用 MATLAB 软件以及 FFT 算法实现对电话通信系统中拨号音的合成与识别。并进一步利用 MATLAB 中的图形用户界面 GUI 制作简单直观的模拟界面。-Content is based on telephone communication system dial tone synthesis and recognition Simulation. Mainly related to the telephone dial tone basic principles of synthesis and identification of the main method, using MATLAB software and the FFT algorithm for telephone communication system dial tone synthesis and recognition. And further use MATLAB graphical user interface GUI interface simple and intuitive simulation.