MPEG-2 AAC音頻解碼器原型芯片設計與實現.pdf

1、合肥工業(yè)大學碩士學位論文MPEG2AAC音頻解碼器原型芯片設計與實現姓名：翟元杰申請學位級別：碩士專業(yè)：微電子學與固體電子學指導教師：高明倫杜高明20090301DesignandimplementationofFPGAPrototypeforMPEG2AACAudioDeeoderAbstractMPEG2AdvancedAudioCoding(AAC)isaveryflexiblecodingstandard，whichsuppor

2、ts48mainchannels，16lowfrequencychannelsanditscompressionratioisupto11：1Moreever，thequalityofAACcanstillbeHiFi，whenthebitratereaches64kbpsComparingtoMPEGLayer3，AAConlyneeds70％bitratetomaintainthesameaudioqualitySoitiswide

3、lyusedinDVD—Audio，mobilecommunication，networkphoneandonlineradioInthisessay，AnMPEG一2AACdecoderisdesignedandverifiedusingFPGASerialandparallelmodelsofsystem1evelarchitecturearefirstlyestablishedThentheMPEG2AACaudiodecoder

4、prototypechipwasdesignedandimplementedinFPGAThecontributionoftheessayissummarizedasfollows：(1)Thesystem—levelmodelsofMPEG2AACdecoderwereevaluatedAhardwareimplementationsolutionofAACFPGAprototypewasproposedconsideratingth

5、epowerareaandflexibilityParallelandserialarchitecturesareproposedTheparallelarchitecturewasimplementedbecauseitcanbeeasilyextendedtomultichannelinthefuture(2)Thehardwarecircuitsofseveralmainmodulesweredesigned，whichmainl

6、yfocusedontheimplementationandoptimizationofPredictionandTNSmodulesPipelinedmethodwasadoptedinPredictionmodule，whichcompressedthepredictionresultratetooneper30clockcyclesThefloatdivisionwasimplementedbyusingmultiplicatio

7、nbasedonlookuptablesInTNSmodule，serialandparallelarchitecturesofIIRfilterwereproposedFortheconsiderationofsimplifyingthecontrollogic，serialarchitecturewasimplemented(3)TheMPEG一2AACdecoderprototypewasimplementedThechipwas

8、implementedusingVerilogHDL，andrunonSatrixlIEP2S180developboardThetotalresourceoccupiedis24116ALUTs，18917registersand3397960memorybitsTheaudioqualityofthedecoderisgoodbyusingstereoaudiocodecontheboardKeywords：AACdecoder；F