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1、東南大學碩士學位論文低碼率特征波形內(nèi)插語音編碼算法的關鍵技術研究姓名:黃蓉申請學位級別:碩士專業(yè):信號與信息處理指導教師:吳鎮(zhèn)揚20090101AbstractAbstract11埔lowratespeechcodingisthecrucialtechnologyofpresentcommunicationfieldOnthefoundationoftheCharacteristicWaveformInterpolation(CⅥ)sp

2、eechcodingalgorithm,thispap明“presentsakindofcodingalgorithmof18kbit/sCWIbased01“Iphonemesegmentationandthecodingalgorithmof24kbit/sCWIbasedonmulfibandThemajorresearchaccomplishmentsofthispaperinclude:1Thespeechsegmentati

3、onalgorithminthelowbitratespeechcodingisstudiedAkindofspeechsegmentationalgorithmbasedOnthecumulateenergyofwaveletuansformationisproposedanditpromotestheprecisionofspeechsegmentationTheeffectivedivisionofvoicedsegmentand

4、unvoicedsegmentisdonethroughspeechsegmentation,andonlythevoicedsegmentiscodedThecorrelationoftl鴝speechsignalofeachspeechsegmentationisusedtocompressandcodetheparameter2ThequantizationmethodofLSFiSstudiedConsideringthefTa

5、l_11ccorrelationofLSFparameters。aquantizationmethodofLSFbasedOntemporaldecompositionisstudiedThecodingspeedofLSFisreducedto695bit/s,andthecodingspeedisgreatlyreducedandarelativelylowerspectraldistortioninaverageisgotten3

6、田地quantizationmethodofcharacteristicwaveformisstudiedToraisecodingefficiencycharacteristicwaveformisdecomposedintoSEWandREW,whicha∞quantifiedrespectivelyaccordingtotheirdifferentperceptualcharacteristicForSEW,quantizatio

7、nisdonebydividingitsamplitudespectrumintothreesubbandForPEW,orthogonalpolynomialfittingisused4A1,8kbit/sCWIspeechcodingalgorithmbasedonphonemesegmentationisproposedThisalgorithmUSeSphonemesegmentationasfrontendprocessing

8、,andquantifiesLSFparametersbytemporaldeI舳mpositionalgorithmItalsoconsiderstheintervalofeventlocationtObethefinalspeechsegmentationpointandquantifiesparametersonthefoundationofsegmentationSubjectivequalitytestsshowthatsyn

9、theticspeechmaintainshigherintelligibilityandcertainllaturaldegree,butitsqualityisslightlylowerthanthealgorithmof24kbit/sMELP5A24kbit/sCWIspeechcodingalgorithmbasedonmultibandisproposedThisalgorithmUSeStheideaofmultiband

10、intheMELPcodingalgorithmanddividesthespeechspectrumintoseveralfrequencybands,inwhichtoanalyzethevoicestrengthAccordingtOtheanalyzingresult,thephasesofSEWandPEWintherespectivefxequencybandaredeterminedandthereforetheMghha

11、rmonicsofthespeechCanberecoveredwellMeanwhile,thecharacteristicwaveformsarepartlyalignedwheninterpolatingtheinstantaneouswaveformssothatthecomputingcomplexityisgreatlyreducedSubjectivequalitytestsRA/Bshowsthatthequalityo

12、fsynthesizespeechisgreatbetterthanthetypical24kbitYsCWIcodingalgorithmandslightlybetterthanthe24kbit/sMELPcodingalgorithmKeyWords:lowratespeechcoding;speechsegmentation;temporaldecomposition;characteristicwaveform;multi—

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