基于DTMF的智能电话控制器.docx

基于DTMF的智能电话控制器.docx

《基于DTMF的智能电话控制器.docx》由会员分享，可在线阅读，更多相关《基于DTMF的智能电话控制器.docx（14页珍藏版）》请在冰点文库上搜索。

基于DTMF的智能电话控制器

DTMF-basedintelligencetelephonecontroller

（Source:

Monolithicmachineanddyadicimplantationsystemapplication）

Abstract:

IntroduceonekindofDTMF（dual-tonemultifrequency）signalandRS485-basedlong-rangeintelligencecontroller.IthasringingdetectingandthesignalsimulatingOffHook,DTMFdecoding,infraredremotecontrolcodecertainlyliftsthefunctionstudyingandlaunchingthemulti-pathinfraredremotecontrolsignal's.Composition,hardwareallocation,softwaretothatcontrollerdesign,operatingprinciple,thefunctiondiscussdetailedlyaswellasthetechnologyfunctionhasbeeninprogressthemainbodyofabook.Thatcontrollerusesthequeen,testifiesthepersonconvenient,reliableandhaspracticalvalueinlong-rangeunderthecontrolofdataterminalsystem.

Keywords:

DTMF；RS485；Infraredremotecontrol；MT8870

1．Summary

Horizontalgoingastepfurtherimproveswiththeindustrialautomation,industrysceneguardinginalotofself-service,hopeisabletocarryoutlong-rangecontrollingonequipmentandmonitor,interposeswithdatacollectaswellasareinprogresstolong-rangedataterminal.Telephone'sgraduallyuniversalthesceneinstallsatelephonewilldoinindustrybecomingpossibility.Thein-bridgehavingdesignedandmakingonekindofDTMF（DualToneMultipleFrequency）-basedmultiplextelephonycontrolleraccordingtothiscondition,us,aslongaswithtelephonecontrollercanpassitrightawayonindustryscenetelephoneline,withusingtelephonenowandtheneverywheretoequipmentbeinprogresson-offcontrol,dataacquisition,long-rangeinterposeandsoon.Besides,horizontalceaselesssocietyeconomyrisealreadybeginsurgethefamilyautomation,peopleishopedbeingabletoputlong-rangesupervisorycontrolintopracticealwaysandeverywheretofamilysafetyandputslong-rangeunderthecontrolofintopracticetothehomeappliance.Becausethetelephonelineisthatthewholenationisnetworked,remotecontroldistancecanstrideovertheprovincecity.Beacontroller'sturntoadoptthemonolithicmachineandpronunciationchip,maymakeuseofpronunciationtohandlethehintbeinginprogresstodiversitymaycouplebacktheinformationsquarestateischargedtogether.

Picture1Principleblockdiagram

2.Compositionandprinciplecontrolling

2.1Thecontrolleroperatingprinciple

Theelectromechanicalincludesaroundnumberiftheroadpursuingwhatpicture1shows:

Ringingchecksandthesimulationextractstheelectromechanicalroute,MT8870waitforthedecodingcircuitbeingcomposedof,infraredgeneratethelaunchcircuit,octuplexswitchamountsimportandoctuplexswitchesamountsexportacontrolcircuit,pronunciationunderthecontrolofandrecordreadjustoneselftoacertainextentcircuit,clockcircuitbeingcomposedofDS12887,RS232orRS485stringstheinfraredsignalselfstudycircuitthatrowofthecircuitcommunicatingbyletter,appositionkeyboardandliquidcrystaldisplaycomposetogether.

Bethecontrolleroperatingprinciple'sturn:

Whileneedinglong-rangeunderthecontrolof,allocatesincethecorrespondingtelephonenumber,theringingdetectingcircuitcheckthebellstreamsignal.（Numberoftimescanpassasoftwareafterringingnumberoftimesreaches5timearbitrarilysetup）,89C51controlthemonolithicmachinerealizingcircuitautomationOffHook,andthestartingpronunciationcircuitissuesahintimportingapassword.Thepasswordcarriesout

acheckbythatthereceivingcircuitreceivingandimportingmiddletomonolithicmachine,checkrightnesspromptsthenimportingthecontrolcommandkey,themonolithicmachinecarriesoutanalyseajudgement,andcorrespondingaccordingtoorderingarequesttobecompletedoperationonorder.Serveastheentering"*"keyqueen,theautomationrealizestelephoneon-hook,accomplishalong-rangeunderthecontrolofthereby.If30sinnerofOffHooknotimportingorderorthepassword,circuitmeetingautomationon-hook;Bythesametoken,ifimportingabuttonexceedalsoautomaticon-hookofeightkeys.

Thecontrollertheequipmentbeingabletostringthefunctiondoingthelong-rangecircuitrealizationinformationcollectcommunicatingbyletter,controllingsomeswitchamountsandhavinginfraredremotecontroltogetherbyRS485;Functionssuchasmaystartupbythefactthatthelong-rangetelephoneorcomputerinterposesregulartimeorshuttingmachinedown.

2.2Thecircuitiscomposedofhardware

2.2.1Ringingchecks,pluckstheelectromechanicalroad

TheringingcheckscircuitisthatcoupleT521-1and74LS123composefrombrightness.Shouldtherebetelephonebreathedoutfashionable,25Hz,90Vbellsignalsexportpulsesignalfromcommutationqueenphotoelectricityisolation.Inbeingpulse'sturntoimportto74LS123,74LS123makeminorpulsecountinginformingtheexpertwavesignal,sendinginthemonolithicmachine.Ding-dangcountingisreachedwhensettingupnumberoftimes,themonolithicmachine

Picture2Ringingchecks,pluckstheelectromechanicalroad

controlsthehighleveloutputing,messengeraudionleads,thereby,therelayattractsthesmallsidedoor,accomplishesasimulationextractingexpedientwork.Sincepronunciationsignalandpairofanaudiblesignalsvoltagearewaybelowbellsignalvoltage,beacircuit'sturntobeabletonotarouseanerroneousjudgementtherefore.Ringingchecks,plucksanelectromechanicaliftheroadpursuingwhatpicyure2shows.

2.2.2Dual-tonemultifrequencydemodulatorcircuit

MT8870isthattheDTMFsignalreceivesthespecialusechiphandling,whosefunctionistowillreceivethedecodingtoDTMAsignalfortwo4makesacode,fromQ1~Q4directoutput.AftersimulatingOffHook,thedual-tonemultifrequencysignalimportsafootbythatthecouplingisolationtransformercouplingentersMT8870.AfteranaudiblesignalfiltersthatpairexceptdialtonesignalfirstafterinternaldialtoneofMT8870wavefilter,sendinpairofVFwavefilteragainasaresultofpreposeanamplifier,pairofanaudiblesignalsissplitaccordingtoheight,thelowfrequencysignal,thedetectorsendsinthedecodingcircuitafterheight,lowfrequencywavefilter,extent,thefinaldataoutputfromMT8870holdscorrespondingcodeofoutput.ReceivetheAT89C51INT0forSTDgainingtheeffectivedata,MT8870.ThinkthatSTDelectricallevelreceivestheeffectivedialingkeyvaluecodefrombeingchangedintoheightlow,beingpassingtheP1mouthhighwaybythatAT89C51checksthequeen.Dual-tonemultifrequencydecodesacircuitifpursuingwhatpicture3shows.

Picture3Dual-tonemultifrequencydemodulatorcircuit

2.2.3Pronunciationcontroledandpronunciationrecordcircuit

Pronunciationunderthecontrolofandpronunciationrecordputinacircuitifpursuingwhat4shows,adopttheISD2590chiptodothefiguresoundrecordingcomponent.Recordputsintimemayamountto90ses,canbecontinuousrecordreadjustoneselftoacertainextentalsobeingabletoreadjustoneselftoacertainextentbythefactthataddresswireA0~A9choosespiecewiserecord.PronunciationchipISD2590movieselectionsinputendCEistostarttheplaybackperiodtimelowpulse.TheplaybacknotfollowingCEelectricallevelreturningtohighlybutisover.CEsignalcomingdownfollowstostartthesoundrecordingperiod.ThePDfootistoenterlow-powerconsumptionstatetimeheight.TheselectedplaybackhandlestheP/Rinputendforhighelectricityintheordinarytime,theselectedlowelectricitysoundrecordingtheordinarytimehandles.CorrespondingpronunciationDuanplayingcomestocometruefromthesoftware.ThesignalthatISD2590SP+,SP-holdgivestheamplificationbeinginprogresstillVFenlargescircuitLM386,gothroughtheisolationtransformercouplingagaintilltelephonecircuit,theconsumercanhearthehintthatsystemunderthecontrolofpronunciationchipissueslifromtelephone,tocarryoutcorrespondingoperation.

ISD2590

Picture4Pronunciationcontrolandpronunciationrecord

2.2.4Infraredlaunchcircuit

555formationproduces38.5kHzpulseoscillatingcircuitsfromtimebasecircuit,thelaunchrealizingthepassagechoiceoutputingwithGAL16V8logicarraycomponentandoverlayingthecarriersignalexporting38.5kHzactingas2803drivequeenswhocontroloutput,passthroughoctuplexdrivegoesout.MonolithicmachinethatP1.4,P1.5,P1.6areGAL16V8threepassagechoiceenteringof89C51,thatP1.7accomplishesmakestobeabletocontrol.ThinkthatP1.7isthatthehighelectricityforbidsoutputingintheordinarytime,;ThinkthatP1.7isthatthelowelectricityallowsoutputintheordinarytime.From89,C51monolithicmachinetimerT0controlstheinfraredpulsestringwidthandgap.Betoimprovetheanti-interferenceabilityandcarryoutreliablecommunication,someremotecontrolimplementneedstotheallkindsofguidancecodebethrustinto,forthepurposeofthereceiveriseasytodistinguishbeforedispatchingbinarysystemcode.Fortheremotecontrolimplementdistinguishingthedifferenttype,needtodispatchanaddresscodeandtocheckacode.Codestrongpointdispatchedbyother,differentremotecontrolimplementisneitheridentical.Theinfraredlaunchisascircuitalaspicturewhat5shows.

Picture5Infraredlaunchcircuit

2.2.5Othercircuit

ThecontrollerhasincreasedrealtimeclockcircuitDS12887,maybeprovidedstandardspacebysystem.Thecontrollerhasthetimingunderthecontroloffunctionatthesametime.

ThecontrollermaycommunicatebyletterbythefactthattheRS485long-rangecommunicatebyletterinterfaceandthesuperordinationcomputerareinprogress,m