Ogg Vorbis音頻編解碼技術(shù)分析及應(yīng)用型改進.pdf

1、電子科技大學(xué)碩士學(xué)位論文OggVbis音頻編解碼技術(shù)分析及應(yīng)用型改進姓名：張晶申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：李曉峰20060501ABSTRACTABSTRACTDigitalAudioCodingisoneofthemostextensivelyuseddigitaltechnologiesDuetotheindividualshortcomings，traditionalMPEG1LayerIII(MP3)tech

2、niqueandahigh—performanceaudiocodingtechnique—AdvancedAudioCoding(hAC)havebeenstronglychallengedbyanewlydevelopingaudiotechnique：OggVorbisVorbiscodingalgorithmcanprovidehighqualityaudiocompressionwithadvancedPerceptualCo

3、dingandTransformCodingtechnologies；andbecauseofitscompletelyopenandnonpatent，VobishasattractedmoreandmoreattentionsbymusicindustrialandaudiouscrsInthispaper，ImainlydevelopedthetheoryofopensourceOggVorbisaudiotechniqueinc

4、ludingitscodinganddecodingprocedureThetheorywasintroducedinsectionsaccordingtodifferentfunctionalmodulesAfteranalysisandderivationononeofVorbis’Scoreprocessparts，aunifiedimplementstructurewaspresentedMeanwhile，somemodifi

5、cationsweremadeonsource—codetoimprovetheaudioqualityFinallysomeexperimentswereconductedtocompareandsummarizethecodingperformanceofOggVorbis，MP3andAACTheachievementofmodificationsonsourcecodewassummarizedaswellChapterOneb

6、rieflyintroducedcuHentdevelopingstatusofaudiocodingtechniquesandthestructureofthispaper；thenChapterTwoshortlydescribedthehistoryofOggVorbisanditstechnicalprocessflow；thedataprocessandparameterscalculationsbeforeVorbisqua

7、ntizationwerediscussedinChapterThree；andthedetailsaboutVorbisquantizationwereshowninChapterFour；thefollowingChapterFiveresearchedtheprocessofVorbisdecoding；inChapterSix，IderivedandprovidedaunifiedimplementstructureonMDCT

8、andmodifiedthesource—code；ChapterSeveniSaboutsomeexperimentswhereIcomparedandanalyzedtofinallypresentasummaryonOggVorbisencodingperformanceandtheresultsoncodemodificationsKeyword：AudioCodingandDecoding，OggVorbis，MDCTPsyc