音頻丟包補償算法研究.pdf

1、大連理工大學碩士學位論文音頻丟包補償算法研究姓名：王朝朋申請學位級別：碩士專業(yè)：通信與信息系統(tǒng)指導教師：殷福亮陳喆20091201音頻丟包補償算法研究ResearchonAudioPacketLossCompensationAbstractNetworkaudiobusinessiSthrivingwiththeworldwidepopularityoftheIntemetandthedevelopmentofdigitalsignal

2、processingtechnology，moreandmorehighfidelityaudioistransportedoverIntemetbycompressioncodingHowever，datapacketswitchingtechnologybasedonIPprotocolprovidesa“Besteffortservice”anditstransmissionenvironmentvariesmomentarily

3、，whichinevitablyleadstopacketdelayandlossItCan’tmeettherequirementofrealtimeaudiodatatransmission，resultinginasharpdeteriorationinaudioqualityTherefore，inordertoimprovetheaudioquality，itisextremelyimportantthattakingeffe

4、ctivepacketlOSScompensationtechnologypredictsandestimatestheinformationofthe10stpacketPacketlOSScompensationcanbeviewedastheproblemofestimatingalostframewhileusingallavailableinformation，suchthatthegeneratedoutputfits，as

5、smoothlyaspossible，betweentheneighboringframesThemainworkofthispaperis：(1)IntroducepriorworkonPacketlosscompensationtechnology(2)Brieflypresentthekemelofperceptualaudioencoder，mainlyfocusontheprincipleofMPEG2AAC，includin

6、gthepsychoacousticmodel，filterbank，quantizationcoding，jointstereoandtemporalnoiseshapingmodule(3)Describethebasictheoryandknowledgeweuseinourpacket10SScompensationalgorithm，includingthesinusoidalplusnoisemodel，MDCTtransf

7、orlTltheory，theMDCTanalysisofsinusoidalsignalandpseudo—spectrum(4)StructuretheframeworkofourpacketlOSScompensationandintroduceeachmodule(5)CarryoutalgorithmsimulationinMPEG一2AACstandard，thealgorithmproposedinthispaperisc