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简介：为健全试管系统的一个宽带变换器被介绍，它联合纵的变换器和类IVflextensional变换器在低频率改进性能并且拓宽工作乐队。相等的电路被获得并且过去常分析在纵的变换器和flextensional变换器之间的联合机制。变换器的一个原型在由有限元素方法优化电声的表演以后被开发。在这个变换器刺激的健全试管的站的波浪被学习了，二件声学的材料样品的健全吸收系数用这个健全试管被测量，它证明变换器能满足声学的材料测量的要求，工作乐队从1.4kHz到23kHz。

简介：以便检测casing地上凿穿的损坏，有一个二维的超声的数组的一个声学的成像方法被介绍。数组的每个元素独立地在超声的波浪下面射出，所有元素收到的回响被取样并且在地面表面上传给一台计算机，动态移植方法在此被用来形成一2或在地上凿穿的状况的3-dimensional图象。数字模拟和实验被进行与在数组使用的元素的一个小数字表明高成像精确性。自从在传统的分阶段执行的数组成像使用的延期电路，系统不在这个系统被需要，并且所有数据进程能在地上凿穿在一个扎根的系统，复杂性和系统的卷被完成可以显著地被简化，它对地上凿穿仪器批评。

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简介：Intheconventionalanalogouscircuittheoryoftheloudspeakersystem,thevibratingairinboxisconsideredaslumpedparameter;inthispaperweconsidertheairasdistributedparameter.Thesoundfieldtheoryandtheanalogouscircuittheoryarecombinedtoanalyzethecharacteristicsoftheloudspeakersystemsuchasradiationacousticpower,frequencyresponseandimpedanceresponse.

简介："Real-TimeSpeechRecognitionSystem"(RTSRS),developedbyInstituteofAcous-ticsAcademiaSINICA,washonoredbyaninternationalaward(25,000FF)athightechnolgyexhibition《TechnologieetComp(?)tivit(?)》heldatGrenobleofFranceonOctober1988.Morethan10,000exhibitsfrom12countrieswerepresentedand4exhibitswerehonoredawards.Thetechnicalcommiteeoftheexhibition"Real-TimeSpeechRecognitionSystem"(RTSRS),developedbyInstituteofAcous-ticsAcademiaSINICA,washonoredbyaninternationalaward(25,000FF)athightechnolgyexhibition《TechnologieetCompétivité》heldatGrenobleofFranceonOctober1988.Morethan10,000exhibitsfrom12countrieswerepresentedand4exhibitswerehonoredawards.ThetechnicalcommiteeoftheexhibitionacknowlegedthattheRTSRShasspecialadvancedcharacteristicsbothintechnicalimprovementandineconomicusage.(YUTiecheng)

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

简介：Hereisreportedaniterationmethod,whichcorrectsthecoordinatesofanunderwatermovingtargetobtainedbyahyperboliclocatingsystemwithashort-baselineplanearraywhenthesoundvelocityvarieswithdepth.Aseriesofdifferentialdifferenceequationsareusedfordeterminingtheiterativevalues.Thecalculatedresultsshowthatunderthesameconditions,thelocationerrorisaboutseveralmetersortensofmeterswithoutcorrectionandlessthan0.5mwithcorrection.Themethodcanbeappliedtovarioustypesofarrays.

简介：AlateralHelmholtzresonatoraddedtoastandingwavetubewithoutflowhasbeenvalidatedasamethodofnoisereductionforcombustionnoiseradiatedfromcombustionchannelofrocketsorturbines.Butinfactthereisaflowwithlowvelocityinthecombustionchannel.ThereforethetheoreticalanalysiscarriedoutisaimedatsoundfieldofstandingwavetubewithflowandwithlateralHelmholtzresonator.Certainlyarelevantmath-physicalmodelshouldfirstbeformulated.Herethreekeyproblemsneedtobesolved:(1)ToformulatethediscontinuityconditionatthejointbetweenthestandingwavetubeandHelmholtzresonatorinthecaseofflow.(2)TodeterminetheacousticimpedanceofHelmholtzresonator,consideringtheeffectsofflow,viscousandmulti_hole.(3)Toformulatethereflectionconditionattheendofthestandingwavetube.SomeformulasforanalysisofthesoundfieldinthetubewithflowandwithlateralHelmholtzresonatorarededuced.Thesetheoreticalworkshavebeenvalidatedbyexperiments.

简介：应力是为韵律在讲话合成处理的一个重要参数。在这份报纸，我们把中立音调音节和强壮的压力音节的声学的特征与中等压力音节作比较，包括沥青，音节持续时间，紧张并且暂停在音节以后的长度。在持续时间和音质之间的关系，以及第三个音调(T3)和音质也被学习。三压力预言基于ANN当模特儿，即声学的模型，语言学模型和混合模型，为预言中国句子的stress.The结果证明混合模型比另外的二个模型更好表演被介绍。以便解决用手的标记的差异的问题，支持比率的一个评估索引被建议。

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