基于voip的vhf通信系统中话音质量增强方法-研究

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1、测试与仿真结果表明，优化硬件链路方法和综合编码方法能够有效地减少丢包，极大程度的提高了基于VolP的甚高频通信系统的话音质量。关键词：甚高频通信；VolP技术；话音质量；奇偶校验；包交织TH匣RESEARCHOFENHANCEⅧNTⅧTHODSFORSPEECHQUALITYBASEDONTHEVOIP．VHFCOⅣ瓜仉烈ICATIONSYSTEMABSTRACTAsaprimarymethodofAir-Groundcommunication，VHFcommunicationplaysakeyroleinthefieldofcivilATM(AirTrafficManagemen

2、t)．Inrecentyears，withtherapiddevelopmentofChinesecivilaviationandtheextremelygrowthofairtrafficflow,theairtrafficisovercrowdedandairtrafficsecurityissuesarebecomingmoreandmoreoutstanding，thisleadstoATMDepartmentsneedmorereliableandstableequipments．VolP-ⅧcommunicationtechnologyisbasedonIPpacket

3、sswitching，voicedataistransmittedontheIPnetworkandVolPtechnologyreducethepossibilityofmalfunction，buttheVoIP-VHFcommunicationsystemhastheproblemofdiscontinuousvoicedistortionintheapplication，whichisadeadlyhazardforaircraftsinflight．Thepurposeofthispaperistoresearchmethodsandtechnologytoenhance

4、thespeechquality,whichisbasedontheVolP一ⅧcommunicationsystemintroducedbyInnerMongoliaATM-SubBureau．Firstly,thispaperanalyzestheprincipleofⅧ．communicationandtheprotocolsofVolPtechnology,andthanwedeeplyanalyzethesignalflowandusagesituationofboththeanalogueⅧcommunicationsystemandtheVolP—VHFcommuni

5、cationsystem．ByanalysisofmethodsforthemeasurementofspeechIIIqualityandfactorswhichweakenthespeechofVoIP．VHFcommunicationsystem，weresearchthecausesofpacketslossandmethodstoreducethem．Inconclusionweproposedtwomethodstoreducetheinfluenceofpacketslossonspeechquality．Oneistooptimizethehardwareroute

6、，theotheroneisthel■·■"11‘·●·一·-·一·一comprehensivecodingwhichISusedofparitycheck、interleavingtechniqueandpacketscopytechnique．Finally,wemakeahardwaretestingplatformtotesttheoptimizedhardwarerouteanddesignaprogramtosimulatethecomprehensivecodingmethodinuseofMatlab．Theresultsoftestingandsimulating

7、provedthattheoptimizedhardwarerouteandcomprehensivecodingnotonlyreducethepacketslossbutalsoimprovethespeechofVolP-Ⅷcommunicationsystemefficiently．KEYWORDS：Ⅷcommunication；VolPtechnology；speechquality；paritycheck；packetsinterleavingIV目录第一