双音多频信号检测教学案例设计

Teaching Case Design of Dual Tone Multi-Frequency Signal Dection

频域分析作为"信号与系统"课程的重要组成部分,因其物理概念复杂、理论计算枯燥学生理解困难等问题造成教学难度大,为了提高教学质量,本文设计了以DTMF信号为例的频域分析教学案例,具体研究了利用离散傅里叶变换分析DTMF信号,并实现按键号码的自动检测。

As an important part of the Signal and System course,the frequency domain analysis is a heavy job to study. There are some characteristics exiting in the course. One is the complex physical concept,the other is the boring theoretical calculation. In addition,the hard understanding of the students is the difficult point to teach. Not only in order to solve the problem in the part of teaching,but also to improve the quality,a teaching case of frequency domain analysis is introduced in this paper. The case practices the Fourier transform from the all directions,checks it by the DTMF coding principle as well. What's more,it realizes the automatic recognition of the keypad tone through the Matlab simulation.