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改进的基于MELP的非连续传输语音编码算法.docx

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改进的基于MELP的非连续传输语音编码算法 Abstract: Inrecenttimes,theincreasingimportanceofvoicecommunicationhasdriventhedevelopmentofimprovedspeechcodingalgorithms.Manyspeechcodingapproacheshavebeenproposed,focusingondifferentdegreesofcompressionwhilemaintainingacceptablespeechquality.AmongthesealgorithmsistheMELPspeechcodingalgorithm,whichprovideslowbit-ratecompressionwhileofferinggoodspeechquality.Thispaperproposesanewnon-continuoustransmissionspeechcodingalgorithmbasedontheMELPcodingapproach.TheproposedalgorithmincludesseveralimprovementstotheexistingMELPalgorithm,includingnewsignaltransformtechniquesandspectralsubtractionprocedures. Introduction: Speechcoding,orspeechcompression,isacrucialtaskinmoderncommunicationsystems,wherethetransmissionofspeechsignalsisincreasinglyprioritized.Speechcodingtechniquesaimtoreducethebit-rateofspeechsignalswhileensuringthattheoutputsignalmaintainsanacceptablelevelofspeechquality.Awiderangeofspeechcodingalgorithms,withdifferentdegreesofcompressionandspeechquality,havebeenproposedintheliterature.Amongthem,MELPcodingisanattractiveapproach,offeringalowbit-ratecompressionwhileretaininganacceptablelevelofspeechquality. However,theMELPalgorithmstillhassomelimitationsthatlimititsperformanceincertainapplications.Inthispaper,weproposeanewnon-continuoustransmissionspeechcodingalgorithm,basedontheMELPcodingapproach,thatovercomessomeoftheMELPalgorithm'slimitations.Inthenewalgorithm,weintroduceseveralsignaltransformationtechniquesandspectralsubtractionprocedurestoimprovethespeechsignal'squality. MELPAlgorithmvs.ProposedAlgorithm: TheMELPalgorithmisalowbit-ratespeechcodingalgorithmthatusesLinearPredictionCoding(LPC)andCodeExcitedLinearPrediction(CELP)algorithms.Italsousesvectorquantizationtoreducethebit-rate.AlthoughMELPprovidesacceptablespeechquality,itstillhassomedrawbacksinsomeapplications,suchaslow-qualitysignalreconstructionduetothelimitationofthecoderincapturingsignalvariations. Inourproposedalgorithm,weimprovethesignaltransformationstagebyincludingaFastFou