利用 MATLAB GUI，对电话拨号音进行合成与识别。

简介：
通过对电话通信系统内拨号音合成与识别的仿真研究，本工作主要集中于探讨电话拨号音合成的底层原理以及其识别过程中的核心方法。具体而言，我们运用 MATLAB 软件，结合快速傅里叶变换 (FFT) 算法，成功地完成了对电话通信系统中拨号音的合成与精确识别。此外，为了便于理解和应用，我们进一步利用 MATLAB 中提供的图形用户界面 (GUI) 工具构建了一个简洁明了的模拟界面。该模拟界面旨在帮助用户对电话通信系统拨号音的合成与识别获得一个初步而直观的认识。该系统能够通过矩阵不同基频的组合，有效地生成 0 到 9 这些不同按键对应的拨号音信号，并且具备准确识别这些不同拨号音的能力。最终目标是实现由拨号音信号解析而得到的电话号码检索功能。(The work focuses on the underlying principles of dial tone synthesis and core methods in its recognition process through simulation research of dial tones within telephone communication systems. Specifically, we successfully completed the synthesis and accurate recognition of dial tones in telephone communication systems using MATLAB software in conjunction with the Fast Fourier Transform (FFT) algorithm. Furthermore, to facilitate understanding and application, we have constructed a concise and intuitive simulation interface using MATLABs graphical user interface (GUI) tools. This interface aims to provide users with a preliminary and intuitive understanding of dial tone synthesis and recognition in telephone communication systems. The system can effectively generate dial tone signals corresponding to keys from 0 to 9 by combining different fundamental frequencies through matrices, and possesses the ability to accurately identify these different dial tones. The final goal is to achieve telephone number retrieval functionality by parsing dial tone signals.)