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VisualRoundwirelessdoorbellinthevoicecommunicationssystemdesignandimplementationFirst:IntroductionMicroelectronicstechnology,wirelesstechnologyandnetworktechnologyforthedevelopmentofmodernpeoplelivingenvironmentofsecurity,facilitatetheprovisionofastrongtechnicalsupport，ThispresentsasmartareaforthesafetyofthenewwirelessdoorbellsystemvisualizationRound,Onthesystem'soverallstructureandworkingprincipleandthekeytechnologyfull-duplexdigitalvoicecommunicationsforthedesignandrealizationof，Analysisofthedigitaltransmissionofvoiceprocessing,aframestructureonthedesignandrealizationoftheCPLDinawirelessdoorbellsystemvisualizationRound-framesynchronization.Finally,theprototypesystembythefieldtest,stableperformance,reliable,clearvoice,hasgoodpracticalvalue.Thedevelopmentofelectronic,wirelessandnetworktechnologyprovidesthestrongtechnicalsupportforsecurityandconvenienceofmodernresidentialquarters.Inthispaper,weintroduceanewstylewirelessvisualinter-conversationdoorbellsystem,whichisusedintheintelligentresidentialquarters.Thenexplainsthestructureofthissystem,andit’sfull-duplexdigitalvoicecommunicationisdesignedandimplemented.Weemphasizethedigitalvoiceprocessintransmission,anddiscussthedesignofthestructureofframe,andtheframesynchronizationrealizedinCPLD.Finally,thetestresultshowsastableandreliablequality,clearvoiceandfairlypracticalvalue.Second:FeaturesAtpresentdomesticdoorbellhasbeenalotofvisualizationproducts,mainstreamproductiswired,one-wayvoiceandSimulation.VisualRoundwirelessdoorbellsystemcombinescomputertechnology,wirelesscommunicationsanddigitalsignalprocessingtechnologyusedinhigh-frequencywirelesstransmitterreceiver,installationwithoutcabling,wouldnotunderminetheeffectivenessdecoration.VisualRoundwirelessdoorbellsystemisthenextgenerationofelectronicsecuritysystems,moderngardens,Villa,Villaidealsecuritydevice.Familyinthelivingroom,throughthescreentoseeimages,voicespeaking,remoteunderstandingofthesituationoutside,accuratejudgementvisitinthecapacityofthereceptiontodecidewhethertoopenthedoortoprotectthefamily'spersonalandpropertysafety.Thesystemusesmodularhybridtechnology,digitalvoice,videosimulation,thefutureisall-digitalwirelessdoorbellsystemvisualizationtalkofatransition,thesystem'smainfeaturesare:(1)2.4GHz,900MHzhigh-frequencysignaltransmission.(2)Inthe60mclearlywithinthescopeofstabletransmissionaudioandvideosignalsatabarriersuchasdistanceis30m.(3)Ifonthedoorbell,DingDongSoundhintsopenautomaticallymonitorscreen(4)Wirelessunlock,andcontroloftheelectricdoorlockcontrol.(5)IndoorWirelessproactivelymonitor.(6)Delayshutdownautomaticallymonitoringsystem.(7)Wirelesstransmission,thereceivercaneasilybeplaced,easyinstallation.(8)Wirelessfull-duplexvoicecommunication.Thesystemiscomposedoftwoparts:partofindoorandoutdoorpart.VisualRoundwirelessdoorbellsystemusesfull-duplexdigitalwirelessvoiceprogrammes,indoorandoutdoormachinesarecorrespondingtothefourbasicmodules,includingA/D/AmodulesfromvoicecodecchipMC145481completed,thespeechsignalprocessingmodulefromtheCPLDdigitalvoicesignalsaswellasapackageofreconciliationpackagesynchronization,therebyenhancinganti-jammingcapability.wirelesstransmit/receivemodulestodealwiththedigitalsignalmodulationanddemodulation,itsuitableforwirelesschanneltransmission.Third:VoicetransmissionprocessingAlthoughvoiceprocessingdigitalsignaltransmissionthananalogsignalshavegreatadvantages,butdigitalsignalanalogsignaldifficultthanreceiving,processingrequirementsmorestringentthantheanalogsignal,withthedevelopmentofsociety,wirelesscommunicationequipmentwidelyused,resultinginincreasedelectromagneticinterference,andadvancesintechnologyenablingwirelessreceivercontinuouslyimprovereceiversensitivity,wirelessreceiverinthecorrespondingsentequipmentwillnotbetherewhentheoutputdatademodulation.Wirelesscommunicationsmustbeaccordingtodataframetransmissionofdatapacket,andmustbeadoptedandreliablewaytoensuretheframesynchronizationofdatafromthechaosofthedataframewillbelegitimateidentified.Framesynchronizationcanbeusedinsynchronousorsynchronouscode.Synchronizationoftherelativelyhighhardwarerequirementstoachievemoredifficult,itseldomusemorethanacodesynchronization.SynchronousCodeshouldensurethatthechoiceofcodeanddatare-synchronizationcodeprobabilityaslowaspossible,soastothegeneralapplicationoftheHS.Thattheneedforre-designcodetoescapeifaframesetupbetweenthetimerandovertimeprovisionsofthetransferagreementinthedataframelength,framesynchronizationcodecanbearbitrarychoice,thegeneralchoice0xAA,0x55,suchas0-1uniformDistributionofdata,andinordertoimprovereliability,oftenthechoiceofmulti-byteframesynchronizationcode,suchas0xAA0xBB(2-byteframesynchronizationcode).Toestablishstablecommunication,astandardwirelessdatatransmissionframeshouldincludeatleastthefollowingparts:(1)Jumpingcode:inthereceivingestablishmentphase,providingreceptionthresholdlevel,itslengthandhardwarerelevantdata,wirelessdoorbellsystemvisualizationTalkbackusedinthex99is0.(2)redundantcode:Accordingtoexperience,usuallyadoptsa0xffor0xff,0x66resultswererelativelygood,andtheestablis