基于双音多频dtmf接收与发射检测系统

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1、摘要双音多频DTMF（DualToneMulti-Frequency）信令，逐渐在全世界范围内使用在按键式电话机上，因其提供更高的拨号速率，迅速取代了传统转盘式电话机使用的拨号脉冲信令。近年来DTMF也应用在交互式控制中，诸如语言菜单、电话银行等。将DTMF信令的产生与检测集成到任一含有数字信号处理器(DSP)的系统中是一项较有价值的工程应用。DTMF(双音多频)技术是DSP技术中的一种。DTMF信号是音频电话的拨号信号。由美国ATT贝尔实验室开发。这种拨号方法取代了脉冲拨号，每一个号码由两个音频信号组成，该双音频由按键

2、所在的行和列对应的频率决定。电话中的双音多频信号有两种作用：一是用于双音多频信号的拨号，去控制交换机接同被叫的用户电话机；二是利用双音多频信号控制电话机各种动作。这些功能的实现离不来DTMF信号的正确的产生和识别检测，专用数字处理信号芯片（DSP）的出现，使这个问题得到轻松的解决。本文给出一种实现方案，阐述DTMF信令的产生与检测的基本原理:用两个二阶数字正弦振荡器产生DTMF信号，并通过Goertzel算法实现DTMF信号检测。关键词：数字信号处理器DSP双音多频DTMF正弦波振荡器Goertzel算法Abstract

3、Becauseofahigherdialingrate,DualToneMulti-frequencysignalinghasgraduallybeenusedworldwideinatouch-tonetelephoneandquicklyreplacedthe30dialingpulsesignalingusedinthetraditionalrotarytelephone.DTMFisalsousedininteractivecontrolrecentyears,suchaslanguagemenu,telepho

4、nebanks.IntegratingthegenerationanddetectionofDTMFsignalingintoanydigitalsignalprocessor(DSP)systemisamorevaluableengineeringapplication.DTMFtechnologyisakindofDSPtechnology.TheDTMFsignalmeansthedialingsignalofaudiotelephonedevelopedbyUSAATTBellLabs.Thismethodrep

5、lacespulsedialing,eachnumbercomposedoftwoaudiosignalsandthetonemadebythecorrespondingfrequencyfromthekeypadrowandcolumn.TherearetwoeffectsonthephoneDTMFsignal.Firstisforthedialingofdual-tonemulti-frequencysignalingtocontroltheswitchesconnectedwiththecalledtelepho

6、neuser;secondisusingDTMFsignalingtocontrolthevariousactionsoftelephone.Implementingthesefeaturescan’tbeapartfromthegenerationofDTMFsignalsandtheidentificationofcorrectdetection,whichiseasilysolvedaftertheappearanceofdedicateddigitalsignalprocessingchip(DSP).Thisp

7、aperpresentsarealizationoftheprogram,describingthebasicprincipleofthegenerationanddetectionofDTMFsignalingthatisusingtwosecond-orderdigitalsinusoidaloscillatortoproduceDTMFsignal,andthroughtheGoertzelalgorithmforDTMFsignalingdetection.ThispaperisbasedonDSPchipfix

8、ed-pointTMS320C54xseriesfromTICompanytoachieveDTMFsignalingdetection.TheusageofDSPtechnologynotonlyincreasesthesystem'sfunctionsandflexibility,butreducesthecos