基于傅里叶变换的双音多频信号识别实验设计  

Experimental Design of Dual Tone Multiple Frequency Signal Recognition based on Fourier Transform

作　　者：夏玉杰[1] 崔建华[1] 高雅[1] XIA Yujie;CUI Jianhua;GAO Ya(School of Physics and Electronic Information,Luoyang Normal University,Luoyang,471934,China)

机构地区：[1]洛阳师范学院物理与电子信息学院,洛阳471934

出　　处：《电气电子教学学报》2023年第5期223-226,共4页Journal of Electrical and Electronic Education

基　　金：河南省高等教育教学改革研究与实践项目(2021SJGLX498);河南省本科高校研究性教学改革研究与实践项目(2022SYJXLX084)。

摘　　要：傅里叶变换是建立信号时间域与频率域之间关系的一种变换。针对傅里叶变换的学习难点,分析了不同类型信号的傅里叶变换关系。结合工程应用,设计了电话拨号的双音多频音频信号按键识别综合实验,通过信号分段、滤波处理和快速傅里叶变换算法提取信号的特征频率,实现了双音多频音频信号的按键号码识别功能。The Fourier transform is to establish a kind of transformation relationship between the signal in the time domain and the frequency domain.For the difficult points of the Fourier transform,the Fourier transform relationship of different types of signals is analyzed.Considering the practical engineering application,a comprehensive experiment of dual tone multiple frequency audio signal to identify key numbers for telephone dialing is designed.By using signal segmentation,filter processing and fast Fourier transform algorithm,a characteristic frequency extraction method based on the discrete Fourier transform is proposed,and the function to identify key numbers is realized for the dual tone multiple frequency audio signal.

关 键 词：傅里叶变换 双音多频 信号识别 

分 类 号：TN911[电子电信—通信与信息系统] G642.0[电子电信—信息与通信工程]