改進(jìn)互聯(lián)網(wǎng)實(shí)時(shí)語(yǔ)音通信QoS的方法研究.pdf

1、重慶大學(xué)碩士學(xué)位論文改進(jìn)互聯(lián)網(wǎng)實(shí)時(shí)語(yǔ)音通信QoS的方法研究姓名：李良普申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：計(jì)算機(jī)軟件與理論指導(dǎo)教師：曹澤翰2001.5.18重窒盔堂堡主堂垡堡苧一一塑墨ABSTRACTNowmanyrealthneaudioapplic撕011shaveappearedi11theIntemet，suchasIPPhoneVOD(videoondemand)Buttherearestillmanyque螄onsthatarcnotr

2、esolved111eimportantoneofthemisthequalityofservice(QoS)BecausetheIPv4ofTCP／口onlyoffersakindof‘13este￡fon，’serviceItdoesnotsupportQoS‘13esteffort’serviceCanlcadtonetworkcongestionTherearepacketvoicejitterhighlatencyandhig

3、herpacketlossrateintherealtimeaudioapplicationItsefiouslyaffecttheq砌i夠ofrealtimeapplication，especiallythespeechthatpeopleareverysensitivenlepurposeandrecentdevelopmentofQoSguaranteeinrealtimeaudiocommunicationintheworlda

4、rcintroducedAlso，thispapergivestheendto—endrealtimeaudiocommtmicationmodelaccordingtotheCallCenterImprovementprojectandraisesthealgorithintesolvetheQoSproblemAnaudioalgorithmispresentedthatisbasedonmultibuffersandmulti—t

5、hreadsandinterleavingandselfrelianceadjtastingtheencodingspeedAndthesimdateexperimentism岔ieintheLANWegivet11epreferableparameterrange11dspaperUSeSshorttimeaveragemagnitudedifferencefunctiontocomputepitchper／odandgivesthe

6、pitchperiodcopyalgorithmtecovertheIostpacketThealgorithinCallbeapplicableteal—timeaudiocommunicationduetoitslOWcomplexityandgoodtimbreWegiveatwoturnrecursivenegotiationalgorithminapplicationlayerwhichCansimplifythenegoti

7、ationprocesSandshortenthenegotiationtimeAtlastaimprovedprior／tyschedulealgorithmispresentedItcarlavoidlow塒面tyaudiostreanlblindlyshrinkingQoSandguaranteehi911joinrighttohigh塒orityaudiostreamAlsowegivethemethodandresultoft