简介：Amethodofdrawingcolorspectrogramofspeechbyusingmicrocomputerisdescribedinthispaper,andreferredtothemetodofdrawingspectrogrambycomputer.Withthesoftwareandnoadditionanyotheraqripment.,wecandrawcolorthree-dimensionspectrogram(orblack-whitespectrogramwith-outcolormonitor),anditissimilartospectrogramofsonagrapher.

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简介：Anewmethodisproposedforidentifyingoutliersinthedirection-of-arrival（DOA）dataofasourceobservedfromalineararraysonar.Supposeasourcemovesuniformlyalongastraightline.Themethodforidentifyingoutliersconsistsofthreesteps.（i）Dividethedataintogroups,eachwithfoursamplepoints,anddeletecertaintwosamplepointsfromeverygroupbymeansofarobustmethodpesentedinthispaper.Whenthepercentageoftheoutliersislessthan50%,thereexistsatleastonegroupinwhichtheremainingtwosam-plepointsare"good".（ii）EstimatetheDOAanditsChangerate,（θ0,θ0）,usingtheremainingtwosimplepointsofeverygroup,andcomputetheobjectivefunctionsofM-etsimatorusingtheresultingestimatesofallgroupsrespectively.A"good"estimateof（θ0,θ0）,whichminmizestheobjec-tivefunctionisthenobtained.（iii）IteratetheM-estimatorwiththe"good"esti-mateof（θ0,θ0）astheinitialvalue,obtainanaccurateestimateof（θ0,θ0）,andidentifyoutliersintheobserveddatausi

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简介：Prosodiccontrolisanimportantpartofspeechsynthesissystem.Prosodicparameterschoicerightorwronginfluencesthequalityofsyntheticspeechdirectly.Atpresent,texttospeechsystemhaslesseffectivedescribetoreflectdatarelationshipsinthecorpus.Anewresearchapproach-dataminingtechnologytodiscoverthoserelationshipsbyassociationrulesmodelingispresented.Andanewalgorithmforgeneratingassociationrulesofprosodicparametersincludingpitchparametersanddurationparametersfromcorpusisdeveloped.Theoutputrulesimprovethecorrectnessofsyllablechoiceintexttospeechsystem.

简介：ThesynchrodoublepulsesignalmodeisfreuqentlyusedinShortBaseLine(SBL)underwaterpositioningsystemsoastoobtaintheinforma-tionofbothdistanceanddepthofatargetsimultaneously.Howerer,thissignalmodealsobringsaboutrangingindistinctnessresultinginashorterpositioningdistancemuchlessthanthatlimitedbytheperiodofthesynchrosignal.Thispaperpresentsahardwaredistance-gatedataacquiringscheme.Itputstheoriginaldatasenttothecomputerinorderof"directfirstpulse—depthinformationpulse(orfirstpulsereflectedbywatersurface)…"toguaranteetheeffectivepositioningdistanceofthesystem.Ithastheadvan-tageofreducingtheprocessingtimeofthecomputerthusensuringtherealtimefunctioningofthesystem.Afigureoftheorbitofanunderwatermovingtargetmeasuredinpracticeisattachedtotheendofthepaper.

简介：Thisreportdescribesanewmethod,theself-searchingmethod,tofindeigenraysinanoceanwherethereisathree-dimensionalsoundspeedperturbationblobonauniformsoundspeedbackground.Comparedwiththetraditionalshootingmethod,thismethodcanreducethenumberofraycalcula-tionsbyabouttwoordersofmagnitude,andaneigenraycanbefoundbycom-puterprogramwithoutmanualintervention.

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简介：Toaimattheproblemthatthehorizontaldirectivityindexofthevectorhydrophoneverticalarrayisnothigherthanthatofavectorhydrophone,thehigh-resolutionazimuthestimationalgorithmbasedonthedatafusionmethodwaspresented.TheproposedalgorithmfirstemploysMUSICalgorithmtoestimatetheazimuthofeachdividedsub-bandsignal,andthentheestimatedazimuthsofmultiplehydrophonesareprocessedbyusingthedatafusiontechnique.Thehigh-resolutionestimatedresultisachievedfinallybyadoptingtheweightedhistogramstatisticsmethod.TheresultsofthesimulationandseatrialsindicatedthattheproposedalgorithmhasbetterazimuthestimationperformancethanMUSICalgorithmofasinglevectorhydrophoneandthedatafusiontechniquebasedontheacousticenergyfluxmethod.Thebetterperformanceisreflectedintheaspectsoftheestimationprecision,theprobabilityofcorrectestimation,thecapabilitytodistinguishmulti-objectsandtheinhibitionofthenoisesub-bands.

简介：Thestudyofwaveguideinvariantinunderwateracousticsisoneofattractedtopicsinrecent30years.Theinterferencesofdirectwaveandreflectwavefromseasurfaceandseabottomofunderwatertargetradiatednoiseinherenttheinformationoftargetdistance.Extractionofthesedistanceinformationwillprovideapossiblenewwayinpassiverangingforunderwatertarget.ThetheoreticalanalysisandtheresultsofatseaexperimentsshowthattheLOFAR(LowFrequencyAnalysisRecord)figureinherentlycontainstherangeandmovinginformationofpassiveacousticsources,eveninthesituationthatthereceiverisonlyonesinglehydrophone.Thetheoreticalanalysisofextractionoftargetdistanceinformationbyusingwaveguideinvariantispresentedinthispaper.Itisshownthat,basedontheinterferencestriationpatternoftarget,thehydrophonearraysystemispossibletoextractthedistanceinformationwithquitehigharraygain.Althoughthemathematicalconstrainconditionsinforminginterferencestriationpatternaredifferentforindividualarrayelement,butitisprovedthatthedifferencesoftimedelaysbetweenarrayelementscanbeusedincompensationofbeamforming.Thetheoreticalanalysis,systemsimulationandsomeresultsofatseaexperimentshowanewwayinpassiverangingandtargetrecognition.

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