摘 要
双音多频信号由于具有抗干扰性强和高速率传输的优点1819treejron，在世界范围内使用在按键式电话机上。近年来，DTMF信号也应用在交互式控制中，诸如语言菜单、语言邮件、电话银行和ATM终端以及VOIP系统中，研究其在 MATLAB下的仿真实现，有助于其具体系统的优化设计。 本文首先阐述了DTMF信号的原理，介绍了在MATLAB仿真软件中产生的DTMF信号的方法，对GEORTZEL算法和快速傅里叶变换法提取的频谱方面的性能进行分析比较。本文仿真时采用GEORTZEL算法，在白噪声的环境下对输入的DTMF信号提取频谱信息，即所谓的检测过程。 本文还用MATLAB的图形控制语句“uicontrol”创建一个按键“pushbutton”的DTMF信号的模拟键盘。发声部分的程序是按照国际标准规定的双音多频拨号系统的频率，每个按键对应低音频组的一个频率和高音频组的一个频率，即每按一键发出特定的双音，并且在频谱图上显示相应的双频。
关键词： GEORTZEL算法，双音多频，快速傅立叶变换，MATLAB
THE ANALYSIS OF DTMF SIGNAL SIMULATION
WITH MATLAB
ABSTRACT
赫塔 米勒
Dual Tone Multi Frequency signal as a strong anti-interference and the advantages of high-speed transmission is now being used worldwide in the push-button telephone. DTMF signals are also applied in recent years,樱花舞教学 interactive control, such as the湖南省校讯通 language menu, language e-mail, phone banking and ATM terminals, and VOIP systems, and thus under study in the MATLAB simulation helps optimize the design of their specific systems.
This paper describes the principles and how DTMF signals generated by MATLAB DTMF signals, and with the GEORTZEL algorithm and the FFT algorithm for fast Fourier spectrum analysis and comparison of extraction, and then, get with the GEORTZEL algori
thm in the context of white noise on the input DTMF signal extracting spectral information, the so-called detection process.
At the same time using MATLAB's graphical control statements "uicontrol" button to create a "pushbutton" the DTMF signal analog keyboard. Sound part of the program in accordance with international standards for dual-tone multi-frequency dialing system frequency, each key corresponds to a group of low audio frequency and a high frequency of the audio group, that is, each issued by a specific two-tone keys, and Spectrum shown in the corresponding frequency.
KEY WORDS： GEORTZEL, 芙秀Dual-Tone Multi-Frequency, Fast Fourier Transfer, MATLAB
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