基于MATLAB的DTMF信号的仿真分析完整版毕业设计.docVIP

基于MAT?LAB的D?TMF信号?的仿真分析? 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，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VOI?P系统中，研究其在 MATLA?B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DTM?F信号的原?理，介绍了在M?ATLAB?仿真软件中?产生的DT?MF信号的?方法，对GEOR?TZEL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GEO?RTZEL?算法，在白噪声的?环境下对输?入的DTM?F信号提取?频谱信息，即所谓的检?测过程。 本文还用M?ATLAB?的图形控制?语句“uicon?trol”创建一个按?键“pushb?utton?”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： GEORT?ZEL算法?，双音多频，快速傅立叶?变换，MATLA?B THE ANALY?SIS OF DTMF SIGNA?L SIMUL?ATION? WITH MATLA?B ABSTR?ACT Dual Tone Multi? Frequ?ency signa?l as a stron?g anti-inter?feren?ce and the advan?tages? of high-speed? trans?missi?on is now being? used world?wide in the push-butto?n telep?hone. DTMF signa?ls are also appli?ed in recen?t years?, inter?activ?e contr?ol, such as the langu?age menu, langu?age e-mail, phone? banki?ng and ATM termi?nals, and VOIP syste?ms, and thus under? study? in the MATLA?B simul?ation? helps? optim?ize the desig?n of their? speci?fic syste?ms. This paper? descr?ibes the princ?iples? and how DTMF signa?ls gener?ated by MATLA?B DTMF signa?ls, and with the GEORT?ZEL algor?ithm and the FFT algor?ithm for fast Fouri?er spect?rum analy?sis and compa?rison? of extra?ction?, and then, get with the GEORT?ZEL algor?ithm in the conte?xt of white? noise? on the input? DTMF signa?l extra?cting? spect?ral infor?matio?n, the so-calle?d detec?tion proce?ss. At the same time using? MATLA?Bs graph?ical contr?ol state?ments? uicon?trol butto?n to creat?e a pushb?utton? the DTMF signa?l analo?g keybo?ard. Sound? part of the progr?am in accor?dance? with inter?natio?nal stand?ards for dual-tone multi?-frequ?ency diali?ng syste?m frequ?ency, each key corre?spond?s to a group? of low audio? frequ?ency and a high frequ?ency of the audio? group?, that is, each issue?d by a speci?fic two-tone keys, and Spect?rum shown? in the corre?spond?ing frequ?ency. KEY WORDS?： GEORT?Z