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1、华侨大学硕士学位论文AbstractDigitalwirelessintercom,akindofprivatenetformobilecommunication,isdifferentfrommobilecommunicationwhichincludemobilephones,cordlessphones,andsoon.Thereisnochargestousingdigitalwirelessintercom,whichhasadvantageinnowiring,easynetworking,highsecurityandhighspectrumefficiency
2、,andsoon.Currentlyinsomebusybusinessplacessuchasbankbusinesshall,theirstaffswhoalwaysneedone-on-onecommunicationfindthattraditionalorordinarydigitalwirelessintercomequipmentcannotsatisfydemandsoflowpriceandoperatingconvenience.Consequently,designingakindofdedicateddigitalintercom,whichnoton
3、lycanbeoperatedbyspeech,butalsohasthecharacteristicsoflowcostandlowpower,hasimportantresearchsignificanceandapplicationvalue.Thispaper,whichbasedonsystemstructureandworkingprincipleofdigitalwirelessintercom,tooklowcostandlowpowerintoconsiderationtoselecthardware,thenproposedtoapplyaudioSOC(
4、systemonchip)whichbasedonCortex-M0processorarchitectureand2.4GRFchiptodigitalwirelessintercom.Meanwhilethispapernotonlydesignedthespeechmodulehardwaredrivers,butalsofocusedonstudyingspeechcodingtechnique,speechpacketlossprocessingtechniquesandspeechrecognitiontechnique.Thispaperspecificwork
5、andcontributionsareasfollows:(1)Inordertosolvethequestionofreducingsystempowerconsumption,wenotonlyproposedthestrategy,whichcontainscontrollingpowerconsumptionandtakingadvantageofG.721speechcodinginthesystem,butalsoestablishingembeddedsystempowerstatisticalmodeltoprovethatthisstrategyiseffe
6、ctive.(2)Forpacketlossleadtopoorcallqualityduringspeechcommunication,thispaperputforwardanewsolution,whichcombinedinterleavingtechnique,retransmissiontechniqueandrepetitiontechnique,bystudyingbothofthespeechpacketlossprocessingtechniquesandthecharacteristicsof2.4GwirelessRFchipNRF24L01.Thea
7、ctualtestprovedthatthismethodnotonlycanimprovethespeechqualityofsystem,butalsocanincreasethecalldistanceofsystem.II万方数据Abstract(3)Thispaperproposedanewideawhichbasesonspeechrecognitiontechnique,itisapplyingspeechrecognitionsystemtodigitalwirelessintercom
