音频信息隐藏算法的研究与实现-翻译Word格式.docx
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苏州大学应用技术学院 11电子班(学号1116405046)汤珏
MULTI-CHANNELAUDIOINFORMATIONHIDINGABSTRACT
Weconsideramethodofhidingmanyaudiochannelsinonehostsignal.Thepurposeofthisistoprovidea‘mix’thatincorporatesinformationonallthechannelsusedtoproduceit,therebyallowingall,or,atleastsomechannelstobestoredinthemixforlateruse.Afterprovidinganoverviewofsomerecentlypublishedaudiowatermarkingschemesinthetimeandtransformdomains,wepresentamethodthatisbasedonusingafourleastsignificantbitsschemetoembedfiveMP3filesintoasingle16-bithoststereoWAVfilewithoutincurringanyperceptualaudiodistortionsinthehostdata.ThehostWAVfileistakentobethefinalmixassociatedwiththeoriginaldatabeforeapplying‘loseMP3’compressionoralternativelyanarbitraryhostaudiosignalintowhichothermultichannelaudiodataishidden.Further,theembeddedinformationcanbeencryptedand/ortheembeddinglocationsrandomizedonachannelbychannelbasisdependingontheprotocoldesiredbytheuser.Themethodisillustratedbyprovidingexamplem-codeforinterestedreaderstoinvestigateandreproducetheresultsobtainedtodateandasabasisforfurtherdevelopment.
1.INTRODUCTION
Theapproachtoinformationhidingdiscussedinthispaperrelatestoaninvestigationintothedesignof‘intelligent’codingalgorithmsforaudiopost-productionbasedonacurrentFP7researchproject.TheresearchhasandiscontinuingtobeundertakenjointlybetweentheAudioResearchGroup,theDigitalMediaCentreatDublinInstituteofTechnologyandTamborineProductionsLimited.Thisincludestheuseof
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watermarkingmethodsforaudiosignalauthenticationandmultipleaudiosignalembeddingtechniquesusingcomputationalsolutionsbasedonimageinformationhidingandauthenticationtechniques,e.g.
Whilethereareanumberofdifferentapproachesforhidingasignalinanotherhostsignal,inclusiveofencryption,orotherwise,therearerelativelyfewpublishedmethodsthatconsideramulti-signaltosinglehostsignalapproach.InthispaperweconsidertheproblemofembeddingmanyaudiosignalsprovideasinMP3formatsintoasinglewaveofWAVfileunderthefollowingconditions:
(i)theembeddedMP3audiodatacanberecoveredwithoutanylossofinformation;
(ii)thehostsignalhasnoperceptualchangeinitsaudiofidelity.AnalgorithmispresentedbasedonatimedomainmethodinwhichfiveMP3filesarehiddeninasingleWAVfileusingafourleastsignificantbitschemewhichsatisfiestheseconditions.
Themethodconsideredhasapplicationsincovertinformationtransmissionwithapplicationsinareassuchascommunicationssecurity,signalauthenticationandDRM(DigitalRightsManagement),forexample.However,themethodreportedhasbeendevelopedinthecontextofanaudiopost-productionproducttoallowsastereo‘mix’toincorporateinformationonallorsomeofthechannelsusedtoproducethesamemix,therebyallowingallorselectivechannelstobeembeddedinthemixforremixingatalaterdateand/orfordatastorage.Currentscenariosusuallyinvolvesapost-productioncentrehavingtomaintainrecordsofallthedatausedtogenerateamixwiththeviewthatthissamedatamayberequiredatalaterdate,therebynecessitatingtheneedforadatabasemanagementinfrastructurewhichmayrequiresignificantoverheads.
Afterprovidinganoverviewofrecentlypublishedworksthatfocus
ontheareaofaudioinformationhiding(Section2),wepresentatimedomainsolutiontotheprobleminSection3.Thisincludesprototypem-codeforinterestedreaderstotestthealgorithmsforthemselvesandasa
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basisfordevelopingthemethodologyfurther.
2.AUDIOINFORMATIONHIDING
AudioinformationhidingorAudioSteganographyisbasedontwospecificanddistinctapproacheswhichconsiderthedevelopmentofalgorithmsusingtimedomaindataortransformdomaindatasuchastheconsinetransform,forexample.Inthissection,weprovideabriefoverviewofsomeofthemostrecentlypublishedmaterialinthisarea,publicationsthathavebeenstudiedbytheauthor’sinassociationwiththemulti-channelinformationhidingapproachconsideredinthispaper.
2.1.AudioHidingintheTimeDomain
Timedomainaudiohidinghastheadvantageofbeingrelativesimpletoimplementandcomputationallyefficient.Howevertheapproachdoesnotyieldalgorithmsthatareasdiverseandrobustasthosedevelopedforthetransformdomain.Thisisbecauseoftherelativelylimitednumberofwaysinwhichdatacanbemanipulatedinthetimedomainsubjecttothegenerationofanoutputthatisperceptuallycompatiblewiththeoriginalaudiosignal.Intheliteraturesurveythatfollows,itisclearthatallthemethodsconceivedarebasedonsomeformofdatamanipulationb