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voice-book-sample-chaps

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2011-10-10 0人阅读 0 0 0 暂无简介 举报

简介:本文档为《voice-book-sample-chapspdf》,可适用于IT/计算机领域

VOICEBOpageVoiceCompressionandCommunications:PrinciplesandApplicationsforFixedandWirelessChannelsbyc©LHanzo,FCASomerville,JPWoodardDepartmentofElectronicsandComputerScience,UniversityofSouthampton,UKVOICEBOpageiContentsPrefaceandMotivationAcknowledgementsITransmissionIssuesThePropagationEnvironmentIntroductiontoCommunicationsIssuesAWGNChannelBackgroundPracticalGaussianChannelsGaussianNoiseShannonHartleyLawTheCellularConceptRadioWavePropagationBackgroundNarrowbandfadingChannelsPropagationPathlossLawSlowFadingStatisticsFastFadingStatisticsDopplerSpectrumSimulationofNarrowbandChannelsFrequencydomainfadingsimulationTimedomainfadingsimulationBoxMu¨llerAlgorithmofAWGNgenerationWidebandChannelsModellingofWidebandChannelsShannon’sMessageforWirelessChannelsiVOICEBOpageiiiiCONTENTSModulationandTransmissionTheWirelessCommunicationsSceneModulationIssuesChoiceofModulationQuadratureAmplitudeModulationQAMoverviewModemSchematicGrayMappingandPhasorConstellationNyquistFilteringModulationandDemodulationDatarecoveryQAMConstellationsQAMBERversusSNRPerformanceoverAWGNChannelsDecisionTheoryQAMModulationandTransmissionQAMDemodulationReferenceAssistedCoherentQAMforFadingChannelsPSAMSystemDescriptionChannelGainEstimationinPSAMPSAMperformanceDi�erentiallydetectedQAMAdaptiveModulationBackgroundtoAdaptiveModulationOptimisationofAdaptiveModemsAdaptiveModulationPerformanceEqualisationTechniquesOrthogonalFrequencyDivisionMultiplexingPacketReservationMultipleAccessFlexibleTransceiverArchitectureConvolutionalChannelCodingBriefChannelCodingHistoryConvolutionalEncodingStateandTrellisTransitionsTheViterbiAlgorithmErrorfreeharddecisionViterbidecodingErroneousharddecisionViterbidecodingErrorfreesoftdecisionViterbidecodingBlockbasedChannelCodingIntroductionFiniteFieldsDe�nitionsGaloisFieldConstructionGaloisFieldArithmeticVOICEBOpageiiiCONTENTSiiiRSandBCHCodesDe�nitionsRSEncodingRSEncodingExampleCircuitsforCyclicEncodersPolynomialMultiplicationShiftRegisterEncodingExampleRSDecodingFormulationoftheRSKeyEquationsPetersonGorensteinZierlerDecoderPGZDecodingExampleBerlekampMasseyalgorithmBerlekampMasseyDecodingExampleForneyAlgorithmForneyAlgorithmExampleErrorEvaluatorPolynomialComputationRSandBCHCodecPerformanceSummaryandConclusionsIISpeechSignalsandWaveformCodingSpeechSignalsandCodingMotivationofSpeechCompressionBasicCharacterisationofSpeechSignalsClassi�cationofSpeechCodecsWaveformCodingTimedomainWaveformCodingFrequencydomainWaveformCodingVocodersHybridCodingWaveformCodingDigitisationofSpeechQuantisationCharacteristicsQuantisationNoiseandRateDistortionTheoryNonuniformQuantisationforaKnownPDF:CompandingPDFindependentQuantisationbyLogarithmicCompressionThe�LawCompanderTheAlawCompanderOptimumNonuniformQuantisationPredictiveCodingForwardPredictiveCodingDPCMCodecSchematicPredictorDesignProblemFormulationVOICEBOpageivivCONTENTSCovarianceCoe�cientComputationPredictorCoe�cientComputationAdaptiveOnewordmemoryQuantizationDPCMPerformanceBackwardAdaptivePredictionBackgroundStochasticModelProcessesThekbpsGADPCMCodecFunctionalGDescriptionAdaptiveQuantiserGQuantiserScaleFactorAdaptationGAdaptationSpeedControlGAdaptivePredictionandSignalReconstructionSpeechQualityEvaluationGandGADPCMCodingMotivationEmbeddedADPCMcodingPerformanceoftheEmbeddedGADPCMCodecRateDistortioninPredictiveCodingIIIAnalysisbySynthesisCodingAnalysisbysynthesisPrinciplesMotivationAnalysisbysynthesisCodecStructureTheShorttermSynthesisFilterLongTermPredictionOpenloopOptimisationofLTPparametersClosedloopOptimisationofLTPparametersExcitationModelsAdaptivePost�lteringLatticebasedLinearPredictionSpeechSpectralQuantizationLogareaRatiosLineSpectralFrequenciesDerivationofLineSpectralFrequenciesDeterminationofLineSpectralFrequenciesChebyshevdescriptionofLineSpectralFrequenciesSpectralVectorQuantizationBackgroundSpeakeradaptiveVectorQuantisationofLSFsStochasticVQofLPCParametersBackgroundTheStochasticVQAlgorithmVOICEBOpagevCONTENTSvRobustVectorQuantisationSchemesforLSFsLSFVectorquantisersinStandardCodecsSpectralQuantizersforWidebandSpeechCodingIntroductiontoWidebandSpectralQuantisationStatisticalPropertiesofWidebandLSFsSpeechCodecSpeci�cationsWidebandLSFVectorQuantizersMemorylessVectorQuantizationPredictiveVectorQuantizationMultimodeVectorQuantizationSimulationResultsandSubjectiveEvaluationsConclusionsonWidebandSpectralQuantisationRPECodingTheoreticalBackgroundTheRPELTPGSMSpeechencoderPreprocessingSTPanalysis�lteringLTPanalysis�lteringRegularExcitationPulseComputationTheRPELTPSpeechDecoderBitsensitivityoftheGSMCodecA’Toolbox’BasedSpeechTransceiverForwardAdaptiveCELPCodingBackgroundTheOriginalCELPApproachFixedCodebookSearchCELPExcitationModelsBinaryPulseExcitationTransformedBinaryPulseExcitationExcitationGenerationTBPEBitSensitivityDualrateAlgebraicCELPCodingACELPCodebookStructureDualrateACELPBitallocationDualrateACELPCodecPerformanceCELPOptimizationIntroductionCalculationoftheExcitationParametersFullCodebookSearchTheorySequentialSearchProcedureFullSearchProcedureSubOptimalSearchProceduresQuantizationoftheCodebookGainsCalculationoftheSynthesisFilterParametersVOICEBOpageviviCONTENTSBandwidthExpansionLeastSquaresTechniquesOptimizationviaPowell’sMethodSimulatedAnnealingandtheE�ectsofQuantizationCELPErrorsensitivityIntroductionImprovingtheSpectralInformationErrorSensitivityLSFOrderingPoliciesTheE�ectofFEContheSpectralParametersTheE�ectofInterpolationImprovingtheErrorSensitivityoftheExcitationParametersTheFixedCodebookIndexTheFixedCodebookGainAdaptiveCodebookDelayAdaptiveCodebookGainMatchingChannelCodecstotheSpeechCodecErrorResilienceConclusionsDualmodeSpeechTransceiverTheTransceiverSchemeRecon�gurableModulationSourcematchedErrorProtectionLowqualitykBdModeHighqualitykBdModePacketReservationMultipleAccesskBdSystemPerformancekBdSystemSummaryMultislotPRMATransceiverBackgroundandMotivationPRMAassistedMultislotAdaptiveModulationAdaptiveGSMlikeSchemesAdaptiveDECTlikeSchemesSummaryofAdaptiveMultislotPRMAStandardCELPCodecsBackgroundTheUSDoDFSkbitssCELPCodecIntroductionLPCAnalysisandQuantizationTheAdaptiveCodebookTheFixedCodebookErrorConcealmentTechniquesDecoderPostFilteringConclusionTheISDAMPSspeechcodecTheJDCspeechcodecTheQualcommVariableRateCELPCodecVOICEBOpageviiCONTENTSviiIntroductionCodecSchematicandBitAllocationCodecRateSelectionLPCAnalysisandQuantizationThePitchFilterTheFixedCodebookRateFilterExcitationDecoderPostFilteringErrorProtectionandConcealmentTechniquesConclusionJapaneseHalfRateSpeechCodecIntroductionCodecSchematicandBitAllocationEncoderPreProcessingLPCAnalysisandQuantizationTheWeightingFilterExcitationVectorExcitationVectorQuantizationoftheGainsChannelCodingDecoderPostProcessingThehalfrateGSMcodecHalfrateGSMcodecoutlineHalfrateGSMCodec’sSpectralQuantisationErrorprotectionThekbitssGCodecIntroduction

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