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1、PerceptualCodingofDigitalAudioTEDPAINTER,STUDENTMEMBER,IEEEANDANDREASSPANIAS,SENIORMEMBER,IEEEDuringthelastdecade,CD-qualitydigitalaudiohasessentiallyMPEG-4,MPEGaudio,multimediasignalprocessing,percep-replacedanalogaudio.Emergingdigitalaudioapplicationsfornet-tualaudiocoding(PAC),percept
2、ualcoding,perceptualmodel,work,wireless,andmultimediacomputingsystemsfaceaseriesofpseudoquadraturemirrorfilter(PQMF),psychoacousticmodel,constraintssuchasreducedchannelbandwidth,limitedstorageca-psychoacoustics,SDDS,signalcompression,signal-processingap-pacity,andlowcost.Thesenewapplicat
3、ionshavecreatedade-plications,sinusoidalcoding,subbandcoding,transformcoding.mandforhigh-qualitydigitalaudiodeliveryatlowbitrates.Inresponsetothisneed,considerableresearchhasbeendevotedtothedevelopmentofalgorithmsforperceptuallytransparentcodingI.INTRODUCTIONofhigh-fidelity(CD-quality)di
4、gitalaudio.Asaresult,manyalgo-rithmshavebeenproposed,andseveralhavenowbecomeinter-Audiocodingoraudiocompressionalgorithmsareusednationaland/orcommercialproductstandards.Thispaperreviewstoobtaincompactdigitalrepresentationsofhigh-fidelityalgorithmsforperceptuallytransparentcodingofCD-qual
5、itydig-(wideband)audiosignalsforthepurposeofefficienttrans-italaudio,includingbothresearchandstandardizationactivities.missionorstorage.ThecentralobjectiveinaudiocodingisThispaperisorganizedasfollows.First,psychoacousticprinci-plesaredescribed,withtheMPEGpsychoacousticsignalanalysistorep
6、resentthesignalwithaminimumnumberofbitswhilemodel1discussedinsomedetail.Next,filterbankdesignissuesachievingtransparentsignalreproduction,i.e.,generatingandalgorithmsareaddressed,withaparticularemphasisplacedoutputaudiothatcannotbedistinguishedfromtheoriginalonthemodifieddiscretecosinetr
7、ansform,aperfectreconstructioninput,evenbyasensitivelistener(“goldenears”).Thiscosine-modulatedfilterbankthathasbecomeofcentralimportancepapergivesareviewofalgorithmsfortransparentcodingofinperceptualaudiocoding.Then,wereviewmethodologiesthatachieveperceptuallytransparent
