基于DSP的MP3編碼器技術(shù)研究.pdf

1、哈爾濱工程大學(xué)碩士學(xué)位論文基于DSP的MP3編碼器技術(shù)研究姓名：呂海平申請學(xué)位級別：碩士專業(yè)：精密儀器及機械指導(dǎo)教師：李緒友20070201哈爾濱工程大學(xué)碩士學(xué)位論文AbstractVoyageDataRecorder(VDR)recordstheaudiodataofthecabandthepivotalcabin，thesoundcanbereplayedbythedecodingequipmentSOitisveryimporta

2、nttofindthereasonofaccidentThisthesisputsforwardarealizingschemeofⅣ巴3encoderbasedonDataSigrlalProcessor(DSP)theschemedealwithseveralpathesofaudiothatthetraditionalVDRc鋤motrealizeTIlisschemehasmanymerits，suchasgoodtone，fi

3、nequalityandcheapprice，conveniencetoconfigureThispaperlucubratestheoryandprocessofencoding，dctailedlyanalysethreemajoraspectsofaudiocompressionalgorithmthese邪pcctsaresubbandfilterbankandModifiedDiscreteCosineTransform(MD

4、CT)，quantificationandcodingformofflameThecodingcancontrolthequantizedvaluesofsubbandandcorrespondingsquaredifferenceofrebuilderrormakingmatchingbitstreammoreaccuratewithmessagesourcecountscharacteristicofpersubband；Besid

5、es，quantizationnoiseofpersubbandisfetteredwithinthesubbandinputsigna王of吼lbb鋤doflesserpowerisavoidedfromcoveringupbyquantizationnoiseofothersubband；Atthesametime，noisefrequencyspectrumisformedbyearssubjectivecharacteristi

6、caccordingtocodingalgorithmandthus，codingsystemperformanceisimprovedgreatlyThethesisalsoputsforwardhardwareandsoftwaredesignschemeofMP3encoderbasedonDM642DSEFirstlymainprocessormodule，acquisitioncircuitmoduleofaudioandEt

7、hemctcircuitmoduieareexpoundedSoftwaredesigniSaccomplishedontheembedoperatingsystemDSP／BIOS，onthebasis，audiocodingchipandEthernctinterfacechipa∞configuredandinitializedwithCSL(ChipSupportLibrary)andNDK(NetworkingDevelopi

8、ngKi0；Furthermorethefunctionofsubprogrammodelsaredetailedlyexpounded；Finallyprocessofcompiling，debuggingandreplantationisdiscussed，thePaperalsoprovidesoptimizingschemeofMP3cncoderandtheresultsofexperimentKeywords：MP3；Ene