简介：J.StuartBolton,ed.xx+636pp,NoiseControlFoundationP.O.Box2469,ArlingtonBranch,Poughkeepsie,NY12603,U.S.A.PriceUS$60.00+19.00airmail.TheNOISE-CON88conferenceofU.S.A.washeldatPurdueUniversity,june20—22,1988.Thethemeoftheconferenceis"NoiseControlDe-sign—MethodsandPractice".Theproceedingscontainthreedistinguishedlecturesand100contributedpapers.Thethreedistinguishedlecturesalladdressthethemeoftheconference.Inhislecture“Istherea‘zero-option‘innoisecontroldesign?”ProfessorP.E.DoakoftheInstituteofSoundandVibrationResearch,SouthamptonUniversity,dis-cussesthepotentialforachievingcompletenoisecancellationandhowitmightbeachievedinpractice.Inthelecture"LoudnessPattern(ISO532B),anexcellantguidetonoise-induceddesignsandtoexpectedpublicreactions"presentedbyProfessor

简介：OrganizedandsponsoredbytheAcousticalSocietyofChina(ASC),theFirstASCMembers‘sRepresentativeConferencewasheldfromNov.7—11,1988inTongJiUniv.,Shanghai.ThethirdmeetingoftheFirstCounciloftheASCandthefifthmeetingofitsStandingCommitteewereheldbeforetheConference.148representativesattendedtheConference.Intheopeningceremony,Prof.YingChongfu,PresidentoftheASC,gavetheopeningaddresswithabriefdescriptionofthepreparationandtheaimoftheConfer-ence.Prof.GuanDinghua,VicePresidentandSecretary-GeneraloftheASC,Pres-entedaworkreportonbehalfoftheFirstCounciloftheASC.Inhisrepory,Prof.GuansummarizedtheactivitiesanddevelopmentoftheASCinthepast3years.The

简介：Regardforthefuzzinessandtherandomnessinsomeacousticfields,amethodforthenumericalanalysisofthe2DacousticfieldwithFuzzy-Randomparameterswasproposedbasedontheequivalentconversionofinformationentropy.Intheproposedmethod,afuzzyrandomacousticfieldwastreatedasapurefuzzyacousticfieldorapurerandomacousticfieldbytransformingallthevariablesintofuzzyvariablesorrandomvariables.Perturbationfiniteelementmethodsforanalyzingthetwo-dimensionalacousticfuzzyandrandomfieldarededuced.Thesoundpressureresponseofa2Dacoustictubeandthe2Dacousticcavityofacarwithfuzzy-randomparameterswereanalyzedbytheproposedmethodandtheMonteCarlomethod,theresultsshowthattheproposedmethodcanbewellappliedtothenumericalanalysisofthe2Dacousticfieldwithfuzzy-randomparameters,andhasgoodprospectofengineeringapplication.

简介：Foraccuracyandrapidityofaudioeventdetectioninthemass-dataaudioprocessingtasks,agenericmethodofrapidlyrecognizingaudioeventbasedon2D-HaaracousticsuperfeaturevectorandAdaBoostisproposed.Firstly,itcombinescertainnumberofcontinuousaudioframestobean'acousticfeatureimage',secondly,usesAdaBoost.MHorfastRandomAdaBoostfeatureselectionalgorithmtoselecthighrepresentative2D-Haarpatterncombinationstoconstructsuperfeaturevectors;thirdly,analyzesthecommonalityanddifferencesbetweensubcategories,thenextractscommonfeaturesandreducesdifferentfeaturestoobtainagenericaudioeventtemplate,whichcansupporttheaccurateidentificationofmultiplesub-classesanddetectandlocatethespecificaudioeventfromtheaudiostreamaccurately.Experimentalresultsshowthattheuseof2D-Haaracousticfeaturesupervectorcanmakerecognitionaccuracy5%higherthanonesthatMFCC,PLP,LPCCandothertraditionalacousticfeaturesyielded,andcanmakethetrainingprocessing7-20timesfasterandtherecognitionprocessing5-10timesfaster,itcanevenachieveanaverageprecisionof93.38%,anaveragerecallof95.03%undertheoptimalparameterconfigurationfoundbygridmethod.Aboveall,itcanprovideanaccurateandfastmass-dataprocessingmethodforaudioeventdetection.

简介：Anewapproachtodeterminealltheelectro-elasticconstantsofthepiezoelectriccrystalsinclass4mmhasbeenputforward.Asanexample,alltheconstantsofLithiumTetraborate（Li2B4O7）crystalhavebeenmeasuredbymeansoftheapproach.Theoutstandingadvantageoftheapproachisthatiton-lyneedstoemployinmeasurementthreecrystalplatesdifferentlyoriented.

简介：Simpleandefficientsurfaceacousticwave(SAW)two-portresonatorswithlowinsertionlossandhighQ-valuesonST-Xquartzsubstrateusingacorrosion-proofA1/Au-stripeelectrodestructurearedevelopedforgassensing.Itwascomposedoftwoshortedgratingreflectorsandadjacentintedigitaltransducers(IDT),andanactivemetalfilminthecavitybetweentheIDTsforthesensitivefilmcoating.Thedevicesareexpectedtoprovidegoodprotectiontowardsmetalelectrodeforgassensorsapplicationinchemicallyreactiveenvironments.Excellentdeviceperformanceaslowinsertionloss,highQfactorandsingle-modeareachievedbycarefullyselectingthemetallicelectrodethickness,cavitylengthandacousticaperture.Priortofabrication,thecouplingofmodes(COM)modelwasperformedfordevicesimulationtodeterminetheoptimaldesignparameters.Thefabricatedsingle-modeSAWresonatoratoperationfrequencyof300MHzrangeexhibitsmatchedinsertionlossof~6.5dBandloadedQfactorinthe3000range.Usingthefabricatedresonatorasthefeedbackelement,adualresonator-oscillatorwithexcellentfrequencystability(0.1ppm)wasdevelopedandevaluatedexperimentally,anditissignificantforperformanceimprovementofSAWgassensor.