简介：Baum-Welchalgorithmmostlikelyresultsinunderflowinpractice.Insomeliteratures,suchas"Scaling"algorithmwasintroducedtosolvetheproblem.Inapplications,however,somemistakeswerefoundintheequationspresentedintheseliteratures.Thepracticalcalculationsshowthattheoriginalalgorithmoftenresultsinpoororevennoneconvergenceandratherhighererrorrateinspeechrecognition.Themistakesintheseliteraturesandbringsforwardthecorrectequationsareanalysed.Thespeechrecognitionsystemusingtherevisedalgorithmcanconvergewellandhaslowererrorrate.

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简介：Inthispaperamodeloftransvcrsalfilterispresentedtostudytheadaptivematchofthetimevariantchannel.Theleastmeansquareerrorfil-teringmethodisusedtoobtaintheweightingcoeffcientsofthefilter.Withthepurposeofspeedinguptheconvergenceoftheiterationequationofadaptivefiltering,anadaptivefactoroftheiterationstepsizeμ_aisderivedinthispaper.Theresultofcomputersimulationshowsthatinthecaseofusingadaptiveμ_a,theconvergencespeedoftheiterationequationisincreased2timesapproximatelyincomparisonwithconstantμ_f.Thestudysuggeststhattheadaptivefilterwithadaptiveμ_a.havetheperformancetofollowthechangeoftime-variantcharacteristicsofthechannel.

简介：Thequadratictransformationmethodisproposedtoestimatethetrabecularspacing(Tb.Sp),animportantindexforosteoporosisdiagnosis.Theperformanceofthisalgorithmwasinvestigatedbyscattermodel,two-dimensionfinitedifferencetimedomain(2D-FDTD)simulationandinvitroexperimentsofbovinecancellousbonespecimens.Comparingwiththeotherfourmethods—autoregressivecepstrum(AR),adaptivefilter-autoregressivecepstral(AFAR),inversefilter-autoregressivecepstrum(InvAR),andsimplifiedinversefiltertracking(SIFT),quadratictransformationismuchmorestableandaccurate.TheresultsdemonstratedthatquadratictransformationisagreatalgorithmforTb.Spestimation.

简介：Themodeloflinearfrequencymodulationcontinuouswave(LFMCW)appliedinunderwaterdetectionandthemethodforthedetectionofechosignalandtheestimationoftargetparameterswerestudied.Byanalyzingtheheterodynesignal,analgorithmwiththestructureofheterodyne-FractionalFourierTransform(FRFT)wasproposed.Toreducethecomputationofsearchingtargetsinatwo-dimensionalFRFTresult.theheterodynesignalwouldbeprocessedbyFRFTataspecificorder,afterRadon-AmbiguityTransform(RAT)wasappliedtoccstimatethesweeprateofthesignal.SimulationsprovedthatthealgorithmcaneliminatethecouplingphenomenonofdistanceandvelocityofLFMCW,andestimatetargets’parametersaccurately.ThelaketrialresultsshowedthattheprocessinggainofLFMCWprocessedbythealgorithminthispaperwas13dBbetterthanthatoftheLFMprocessedbymatchedfilter.TheresearchresultsindicatedthatthealgorithmappliedinLFMCWunderwaterdetectionwasfeasibleandeffective,anditcouldestimatetargets’parametersaccuratelyandobtainagooddetectionperformance.

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简介：常规MVDR适应beamformer是用真实的声学的地的narrowbandCSDM估计最佳的beamforming重量的高分辨率的narrowbandbeamformer。在实际应用，MVDR算法需要长观察时间估计协变性矩阵。这个固有的性质使本地化移动迅速的目标困难。为宽带信号，MVDR算法需要转换增加计算要求的每CSDM。为相关来源，因为信号将取消对方，MVDR的性能将戏剧性地降级。一个快会聚的MVDR算法基于subbandsubarray处理被建议。完整的频率乐队被划分成subbands的集合，线数组被划分成subarrays的集合。为每subband，减少的尺寸的STCM是计算的。快会聚的MVDR算法和空间光谱评价的然后适应的beamforming重量被获得。同时，空间光谱评价能用两方面的空间变光滑方法为相关来源被做。模拟和试用数据的结果证明建议方法有高分辨率、在即时附近的集中性质，两方面的空间变光滑有decorrelation的令人满意的有效性。

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简介：Amorerelaxedsufficientconditionfortheconvergenceoffiltered-XLMS(FXLMS)algorithmispresented.Itispointedoutthatifsomepositiverealconditionforsecondarypathtransferfunctionanditsestimatesissatisfiedwithinallthefrequencybands,FXLMSalgorithmconvergeswhateverthereferencesignalislike.Butiftheabovepositiverealconditionissatisfiedonlywithinsomefrequencybands,theconvergenceofFXLMSalgorithmisdependentonthedistributionofpowerspectraldensityofthereferencesignal,andtheconvergencestepsizeisdeterminedbythedistributionofsomespecificcorrelationmatrixeigenvalues.ApplyingtheconclusionabovetotheDelayedLMS(DLMS)algorithm,itisshownthatDLMSalgorithmwithsomeerroroftimedelayestimationconvergesincertaindiscretefrequencybands,andthewidthofwhicharedeterminedonlybythe"time-delayestimationerrorfrequency"whichisequaltoonefourthoftheinverseofestimatederrorofthetimedelay.

简介：为浅水里的单个模式的靠近环的刺激的一个最佳的算法被介绍。由分析草地函数矩阵的评价价值的协变性，一个最佳的来源数组重量矩阵被介绍估计草地工作矩阵。重量矩阵是一个单一的矩阵，并且矩阵元素的绝对值是相等的。基于重量，矩阵使刺激单个模式以最大的速度收敛并且稳定的算法。算法的优点被数字模拟证实。最后，浅水实验的结果被介绍，并且单个模式的精力比率比97%高。

简介：Withtheincreasingofdetectionabilityofpassivesonar,theweaksignaldetectionprobleminmultipleinterferencesbecomesmoreandmoreimportant.Inthetime/bearingrecord(TBR)displayofsonardetection,whenthereexisttracesofmultipleinterferences,theidentificationofweaksignalisdifficultorimpossible.Theadaptivenoisecancellationtechniqueprovidesthetheoreticalbasisforsuppressingstronginterferences.Butthesolutionforfindingthesteady-stateoptimumfiltermatrixisquitedifficultduetotherealtimecalculationofinversematrixofinputdatacorrelationmatrix.Theiterativeinversebeamforming(IBF)algorithmforsolvingtheoptimumfiltervector,whichisexpressedbyinversematrixoftheoceanenvironmentdata,isderivedinthispaper,bywhich,theoptimumfiltercanbeeventuallyexpressedasasumofseriessimplematricesofconstructedfromsensordata.Basedonthealgorithmproposedinthispaper,someexamplesofatseaexperimentareprovided.Thestronginterferencesarecancelledandtheweaksignalisemerged,evenitdidn'tappearintheconventionalbeamforming(CBF)processing.

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简介：一个被动的合成的孔基于为解决港口右舷辨别问题在的阶段修正算法不结盟拖引的成双线的数组声纳，被描述。这个方法通过使用估计的阶段修正进成双线的数组的一个数组创造一个虚拟数组。因为合成虚拟数组在成双线的数组与另外的数组被排列，区别的正确港口右舷结果能被数组基于新合成成双线的数组处理获得。建议方法的效果被显示出由模仿并且在拖引的成双线的数组声纳的海试用结果。与低额外的计算负担，建议方法是容易的适用于实践。

简介：为协调宽带的评价在未知相关噪音领域里采购的到达(DOA)的方向的一个柔韧的算法被调查。噪音通常在在实际应用程序的传感器之中未知、相关，特别为有比较地小的孔的数组。空间地相关的噪音在在DOA评价集中错误和严重降级招致增加，并且因此，基于区分协变性矩阵集中转变的一个方法被建议消除噪音，因此减少集中的错误。模拟和试验性的结果表明建议方法的有效性。

简介：有Doppler超声技术的传播emboli的非侵略的察觉具有在临床的applications.In顺序的活跃意义消除探针或病人的运动带的人工制品的缺点并且精确地检测emboli，相关特征参数从信号波形的Dopplersignals.The奇特的小浪变换的二个角度被提取基于它的小浪由易到难的试题程序被分析；然后横向、纵的参数被提取到represen

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

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