简介:Themethodofcoupledmodeisintroducedforinvestigationofbi-staticdistantbottomreverberationofimpulsivesourceinshallowwater,whichwillnotcontradictwithprincipleofreciprocityinallcases.Andthemethodofmulti-polefordirectionalsourceisalsointroduced.Itshowsthatincaseoflayeredmedium,intensityofbi-staticbottomreverberationwilldeceaseaccordingtothecubicpowerofreceivingtimet,andthetransversespatialcorrelationofbottomreverberationisalittlegreaterthanlongitudinalcorrelationforequalseparationofreceivers,andbothvaryinformwiththereceivingtime.
简介:Thecriticaltechnicalproblemofunderwaterbottomobjectdetectionisfoundingastablefeaturespaceforechosignalsclassification.Thepastliteraturesmorefocusonthecharacteristicsofobjectechoesinfeaturespaceandreverberationisonlytreatedasinterference.Inthispaper,reverberationisconsideredasakindofsignalwithsteadycharacteristic,andtheclusteringofreverberationinfrequencydiscretewavelettransform(FDWT)featurespaceisstudied.Inordertoextracttheidentifyinginformationofechosignals,featurecompressionandclusteranalysisareadoptedinthispaper,andthecriterionofseparabilitybetweenobjectechoesandreverberationisgiven.TheexperimentaldataprocessingresultsshowthatreverberationhassteadypatterninFDWTfeaturespacewhichdiffersfromthatofobjectechoes.Itisproventhatthereisseparabilitybetweenreverberationandobjectechoes.
简介:摘要:本文介绍了在指挥中心、硬装会议室等高混响场景中普遍存在的问题,包括扩声音量不足、啸叫、浑浊不清和可懂度低等。文章探讨了高混响场景的特点,以及扩声系统在面临挑战时所处的现状。研究重点放在了拾音、传输、处理和扩声链路的系统拓扑、布局、设备选型以及系统调试方法对效果的影响上。同时,提出了拾音扩声布局和传声增益计算的方法,并对"混音系统"和"分区系统"进行了方案设计和比选。最后,通过一个实际案例进行展示,阐明了改造方案对会议扩声系统效果的提升作用。实验结果表明,本文提出的解决方案有助于提高会议扩声系统在高混响场景下的效果,从而提升会议的质量和参与者的体验。