标签: reduction

PrinciplesofNoiseReductioninCommunicationChannels

伯克利大学机器学习(PracticalMachineLearning)Dimensionalityreduction[PercyLiang].pdf

HA12090NTDOLBYB-CTYPENOISEREDUCTIONSYSTEM

CX20188SONYDOLBYB-CTYPENOISEREDUCTIONSYSTEM

TND6032-D_ONSEMI_ReductionofSwitchedModePowerSupplyElectro‐MagneticEmissionsinAutomotiveCockpitApplications.PDF

2018complexityreduction

ThemovingaverageisthemostcommonfilterinDSP,mainlybecauseitistheeasiestdigitalfiltertounderstandanduse.Inspiteofitssimplicity,themovingaveragefilterisoptimalforacommontask:reducingrandomnoisewhileretainingasharpstepresponse.Thismakesitthepremierfilterfortimedomainencodedsignals.However,themovingaverageistheworstfilterforfrequencydomainencodedsignals,withlittleabilitytoseparateonebandoffrequenciesfromanother.RelativesofthemovingaveragefilterincludetheGaussian,Blackman,andmultiplepassmovingaverage.Thesehaveslightlybetterperformanceinthefrequencydomain,attheexpenseofincreasedcomputationtime.CHAPTERMovingAverageFilters15ThemovingaverageisthemostcommonfilterinDSP,mainlybecauseitistheeasiestdigitalfiltertounderstandanduse.Inspiteofitssimplicity,themovingaveragefilterisoptimalforacommontask:reducingrandomnoisewhileretainingasharpstepresponse.Thismakesitthepremierfilterfortimedomainencodedsignals.However,themovingaverageistheworstfilterforfrequencydomainencodedsignals,withlittleabilitytoseparateonebandoffrequenciesfromanother.RelativesofthemovingaveragefilterincludetheGaussian,Blackman,andmultiple-passmovingaverage.Thesehaveslightlybetterperformanceinthefrequencydomain,attheexpenseofincreasedcomputationtime.Im……

摘要：美国联邦通信委员会（FCC）的政府机构，规范无线电频率（RF）在美国的排放量，在1975年颁布称为FCC第15部分的新法规。这些都没有在控制设备，如广播和电视发射机，或飞机导航和紧急信标，故意辐射高功率射频能量。相反，这些法规旨在控制设备，确实不是故意的辐射射频能量，如电视，汽车，低功耗，对讲机和电子遥控器，如无管制射频散热器。在20世纪80年代和20世纪90年代，电子设备，手机增殖微波炉。这些设备之间的交叉干扰就成了一个问题。传统的方法来解决辐射问题，包括屏蔽，精心的电路板布局，以及过滤，以减少意外的辐射。作为电子产品变得越来越小，另一种技术，扩频通信应用借来使用。本文给出了扩频的背景和历史，并介绍如何使用它作为今天的技术，以减少在消费电子设备的辐射。Maxim>AppNotes>CommunicationsCircuitsWireless,RF,andCableKeywords:EMI,spreadspectrum,EMIreduction,EMIcontrol,dither,DS1086,radiationcontrol,radiationMay29,2003reduction,FCCPart68APPLICATIONNOTE1995UsingSpreadSpectrumOscillatorstoReduceRadiatedEmissionsinConsumerProductsAbstract:In1975theFederalCommunicationsCommission(FCC),thegovernmentagencythatregulatesradiofrequency(RF)emissionsintheUnitedStates,enactednewregulationscalledFCCPart15.ThesewerenotdirectedatcontrollingequipmentsuchasradioandTVtransmitters,oraircraft-navigationandemergencybeaconsthatdeliberatelyradiatehigh-powerRFenergy.Instead,theseregulationssoughttocontrolequipmentthatdidnotdeliberatelyradiateRFenergysuc……

Audiosectionnoisereductionmethods20111StevensCreekBlvd.,#260Cupertino,CA95014.U.S.A.Tel:408.253.3883Fax:408.253.6630LanwaveTechnology,Inc.SystemApplicationNoteAN-7AudioSectionnoisereductionmethodsinSATURNCordlessPhoneDesignL9002VX/VX2CodeDivisionSpreadSpectrumTelephoneChipRevision:V1.2Date:April1999Lanwave1999Page120111StevensCreekBlvd.,#260Cupertino,CA95014.U.S.A.Tel:408.253.3883Fax:408.253.6630AudiosectionnoisereductionmethodsDigitalCordlessPhonewithhighpowerradiodesignrequiresspeciallayoutprecautionstominimizingaudionoiseduetoRFAMcouplingandTX/RXswitchingcurrentchange(commonlyknownasTDDnoise).Theseproblemsexistsinnarrowbandcordlessphonestoasmallerdegreeduetotheirlowradiatedpower.Indigitalcordl……