数字化对讲机研究

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7、ntinue.Nowadays,analogwalkie-talkieinthedomesticmarketstillhasthemajorityshareandthedigitalwalkie-talkie(DWT)stillatthestartingstage,thenumberofindependentintellectualpropertyrightsDWTalsoarescarce.Thispaperanalyzestheexistinganalogwalkie-talkie'sbasicprinciples,performanceandtheshortc

8、omings,combiningwiththeexistingwirelesscommunicationtechnologies,speechcodectechnique,synchronizationtechnologyandDSPtechnology,andresearchesanddesignsaDWTbasebandsystemcommunicationprotocolschemeandtheoverallstructure.ThendesignstheDWTbasebandhardwarecircuit;selectssomechipsoffront-en

9、dvoice,DSP,AD/DA,powermanagement;PCBdrawingandcomponentsinstalled;designsthesystemsoftware;Afterthehardwareandsoftwaredebugging,downloadstheproceduretoTI，sTMS320VC5502DSPchip,teststhesystem,andanalyzestheresults.TheresultsprovetheschemebasedonDSPbasebandGMSKmodulationanddemodulationo