Principle
ThevideorecorderisthebasictoolforTVprogramproduction.Thedevelopmentprocessofthevideotaperecorderhasalsotransitionedfromtheanalogsignalformtothedigitalsignalform.Sincethevideosignalprocessinghas4:2:2,4:1:1,4:2:0formats,thecompressionmethodsaredividedintointra-fieldDCT,intra-frameDCTandMPEG-2.Thebitratecompressionratioisdifferent,andtherecordingThecoderateisabout200Mbps,100Mbps,50Mbps,and25Mbps.Thetapewidthis3/4,1/2,1/4inches,MPandME,andsoon.Theformatsofdigitalvideorecordersareverydiverse.
DigitalDVformat
ThehomeDVformatisinthedevelopmentstageofhomedigitalvideorecorders.Inordertoavoidtherepetitionoftheanalogvideorecorderformatdispute,itwasjointlyformulatedbysomewell-knownelectricalcompaniesintheworldAstandard.55majorcompanieshaveannouncedtheirsupportforthisformat,makingitaninternationalstandard.ForPALsystemsignals,ituses4:2:0samplingformat,8-bitquantizationandDCTintra-framecompression.Thecompressionratiois5:1,therecordingcoderateis25MB/S,andthesignal-to-noiseratiocanreach54dB.Foraudio,32KHZsampling,16-bitquantizeddual-channelstereomodecanbeused,and32KHZsampling,12-bitquantizedfour-channelmodecanalsobeused.TheimagequalityofthehomeDVformatisquitehigh,farexceedingthecommonS-VHSandHi8,becausethebandwidthoftheluminancesignalbandreaches6MHZ,andthebandwidthofthecolordifferencesignalreaches1.4MHZand3MHZrespectively.ThehomeDVformatalsousesa1/4-inchmetalparticletapewithatrackwidthof10microns.
DigitalDVCAMformat
DVCAMisalsoasuccessfulprofessionaldigitalcomponentcamcorderbasedonthehomeDVformat.LikeDVCRRO25,itsgoalishighimagequality,smallsize,lightweightandlowprice.Ituses4:2:0samplingformat,8-bitquantizationandDCTintra-framecompression,thecompressionratiois5:1,therecordingcoderateis25MB/S,thesignal-to-noiseratioisgreaterthan54dB,andithas2-channel48KHZ,16-bitquantization.Digitalaudio.Ituses1/4-inchmetalparticletapewithatrackwidthof15microns.Itistwo-waycompatiblewithhouseholdDVformat,thatis,DVformattapescanbeplayedbackonDVCAMvideorecorders,andDVtapesrecordedbyDVCAMvideorecorderscanalsobeplayedbackonDVformatvideorecorders..TheimagequalityisequivalenttothestandardBetacam-SP.
Digitalbetacamformat
Thesignal-to-noiseratioofdigitalbetacamcanreach62dB,adopts4:2:2samplingformat,10-bitquantizeddigitalcomponentprocessing,andusesDCT-basedelectronicsFlatadaptiveintra-framecompression,withacompressionratioof2:1,using1/2-inchmetaltape,4-channel48KHZsampling,20-bitlinearquantizationdigitalaudio.Itcancopy30generationsofimagequalitywithoutlossofquality,andiscompatiblewiththeplaybackofBetacam-SPanalogcomponentformatvideotapes.
DigitalBetacamSXformat
ThedigitalintegratedcamcordersanddigitalvideotaperecordersofthisformatseriesuseadvancedMPEG-24:2:2P@MLcompressionalgorithm,Compressionratio10:1,canrecord8bit4:2:2digitalcomponentvideosignals,andcanrecordandreproduce4channelsof16bituncompresseddigitalaudiosignals,using1/2inchmetalparticletape,andcompatiblewithreproducinganalogsignalsBetacamandBetacamSPformatbelts(providedbyDNW-A65PandDNW-A75P),whichmakesthetransitionofBetacamSXtoafullydigitalenvironmentmoreeconomicalandreasonable.
DigitalDVCPRO25andDVCPRO50formats
DVCPROformat
Alargenumberofstandard4:1:1formatsareusedinimageprocessing,thatis,thebrightnessofthesamplingfrequencyfy=13.5MHz,colordifferencefPB,R=3.375MHz.Infact,thevideosignalinputofDVCPROisin4:2:2format.After4:1:1conversion,itisrecorded.Duringplayback,the4:1:1off-bandsignalisinterpolatedtoforma4:2:2formatsignal.Output.Fromthedataratepointofview,thenetdatarateofthe4:2:2formatis[(720+2×360)×576×8]×25≈165.9Mbps,convertedto4:1:1,itis[(720+2×180)×576×8]×25≈124.4Mbps,compressedto25Mbpsforrecording,therequiredcompressionratiois124.4Mbps/25Mbps≈5:1.Using1/4inchMPtape,itcanalsorecord4channelsof16bitdigitalaudiosignalsatthesametime.
DVCPRO50formatisstandard4:2:2inputandoutput,andtheinternalprocessingisalso4:2:2format,videodatarateis50Mbps,compressionratio=165.9Mbps/50Mbps≈3.3:1.Toensurehigh-qualityimages,itisahigh-endbroadcastdigitalcamcorder.Italsouses1/4-inchMPtape,andcanrecordandreplayprogramtapesrecordedinDVCPROformatinDVCPROformat.
DigitalDigital-S(D9)format
Thisformatvideorecorderuses4:2:2format8bitquantizationprocessing,andusesDCT-basedintra-framecodingand50Mbpsvideobitrate,The3:1compressionratiomeetstheinternationalprofessionalstandardofCCIR601analogsignaldigitization,ensuringthehighdefinitionandcoloreffectoftheimageaftermulti-generationcopying.Use1/2inchhighdensitymetalcoatedtape.
Function
Thevideorecorderisarecordingandplaybackdeviceinaclosed-circuittelevisionsurveillancesystem.Itrequiresaverylongrecordingtime.Mostvideorecordersdedicatedtosurveillancesystemscanrecord24H~960Hvideo.Inaddition,thevideorecordermustalsohavearemotecontrolfunction,sothatthevideorecordercanbeeasilyoperatedremotely,orthevideorecordercanbeautomaticallyoperatedwithacontrolsignalinaclosed-circuittelevisionsystem.
ThededicatedvideorecorderintheCCTVsurveillancesystemisanintermittentvideorecorder.Ithasavarietyoftimeintervalrecordingmodes.Itcanrecordupto960Hona1/2-inchVHS/E180cassette.Video.Thevideorecorderisequippedwithacharactersignalgenerator,whichcanprintmonth/day/year/week/hour/minute/second/recordingmodeontheimagesignal,andalsoshowthenumberandalarmmodeofthecameraandalarmontheimage.Usingtheautomaticrecordingperiodsettingfunction,youcanprogramtherecordingmodeforeachdayoftheweek.Afterreceivingthealarmsignal,thevideorecorderwillautomaticallyenterthecontinuousrecordingstate,andresumenormalintermittentrecordingmodeifthereisnoalarm.Inaddition,thevideorecorderhasalockprotectionkeytoinvalidateabnormalcommandsandoperations,preventingnon-professionalsanddestructiveoperationsfrominfringingontheclosed-circuittelevisionmonitoringsystem.
Classification
DVRsaremainlydividedintotwocategories,oneisPC-basedharddiskvideorecordersbasedoncomputerarchitecture(alsoknownasindustrialcontrolharddiskvideorecorders),andtheotherisbasedonembeddedIntermsofmarketapplications,thetwotypesofharddiskvideorecorderswithembeddedprocessorshavetheirownmerits.TheearlyharddiskvideorecorderswereallPC-typeharddiskvideorecordersbasedoncomputerarchitecture.Later,themarketshareofembeddedharddiskvideorecordersgraduallyincreased,andthetwowereinthemarket.Theshareisbasicallythesame.
ThedomesticharddiskvideorecorderproductsaremainlymadeinChina.PC-typeharddiskvideorecordershavematuretechnology,buttherearenobrandedproducts.Mostofthemareassembledbyusersorengineersthemselves,andtheentrythresholdofembeddedharddiskvideorecordersHigher,mainlybasedonbrands.PC-typeharddiskvideorecorderscanbesubdividedintotwotypesbasedoncapturecards(alsocalledsoftcompressioncards)andcompressioncards(alsocalledhardcompressioncards).Inviewoftechnicalfactors,embeddedharddiskvideorecordersarestilldominatedbyproductswithlessthan16channelsofvideoinput,andembeddedproductswithmorethan16channelsarestillrare.
PCtype
IndustrialcomputerPCDVR
IndustrialcomputerPCDVRadoptsindustrialcontrolchassis,whichcanresisttheharshandinterferenceofindustrialenvironment.UsingCPUindustrialintegratedcardandindustrialbackplane,itcansupportmorevideoandaudiochannelsandmoreIDEharddisks.Ofcourse,itspriceistwoorthreetimesthatofageneralcommercialPC.Itisoftenusedinvariousimportantoccasionsandsituationsthatrequirealargenumberofchannels.
CommercialmachinePCDVR
CommercialmachinePCDVRgenerallyalsousesindustrialcontrolchassistoimprovethestabilityandreliabilityofthesystem,andthenumberofvideoandaudiochannelsislessSomealsouseordinarycommercialPCcases.ItusesageneralPCmotherboardandvariousboardstomeettherequirementsofthesystem.Itischeapandadaptabletotheenvironment.Itisoftenusedinvariousgeneraloccasions,andthenumberofimagechannelsisgenerallylessthan24.
ServerPCDVR
ServerPCDVRusestheserverchassisandmotherboard,etc.,anditssystemstabilityandreliabilityarealsogreaterthantheprevioustwoimprove.ItoftenhasUPSuninterruptedpowersupplyandmassivediskstoragearray,andsupportshot-swappableharddiskfunction.Itcanruncontinuouslyfor24hours×7daysforalongtime.Itisoftenusedinspecialapplicationdepartmentswithalargenumberofmonitoringchannelsandveryhighmonitoringrequirements.
Embedded
Embeddedsystemsgenerallyrefertonon-PCsystems,devicesorequipmentthathavecomputerfunctionsbutarenotcalledcomputers.Itisamicro-specialcomputersystemwithstrictrequirementsonfunctions,reliability,cost,volume,powerconsumption,etc.,withapplicationasthecenter,softwareandhardwarecanbecut.Simplyput,theembeddedsystemintegratestheapplicationsoftwareandhardwareofthesystem,whichissimilartotheworkingmodeoftheBIOSinthePC.Ithasthecharacteristicsofsmallsoftwarecode,highautomation,andfastresponsespeed.Itisespeciallysuitableforreal-timeandmulti-taskingrequirements.application.
EmbeddedDVRisanembeddedsystembasedonanembeddedprocessorandanembeddedreal-timeoperatingsystem.Itusesadedicatedchiptocompressanddecompressimagesforplayback.Theembeddedoperatingsystemismainlyusedtocontroltheentiremachine.Andmanagement.ThistypeofproductdoesnothaveasmanymodulesandredundantsoftwarefunctionsasPCDVR.Thesoftwareandhardwarestabilityareplannedduringthedesignandmanufacture.Therefore,thequalityofsuchproductsisstable,andtherewillbenocrashes.Thestoragespeed,resolutionandpicturequalityofthevideoandaudiocompressionstreamhavebeengreatlyimproved.Intermsoffunction,itisnolessthanPCDVR.
TherealizationofthevariousfunctionsofPCDVRrelyonvariousboardstocomplete,suchasvideoandaudiocompressioncard,networkcard,soundcard,graphicscard,etc.Thiskindofplug-insystemisusedinsystemassembly,maintenance,andtransportation.Itispronetounreliabilityproblemsinthemediumandcannotbeusedintheindustrialcontrolfield.Itisonlysuitableforcommercialofficeenvironmentsthatdonotrequirehighreliability.TheembeddedDVRsystemisbuiltonanintegratedhardwarestructure.Theentirevideoandaudiocompression,display,networkandotherfunctionscanallberealizedbyasingleboard,whichgreatlyimprovesthereliabilityandstabilityoftheentiresystemhardware.
Features
DisadvantagesPoorstabilityDVRsoftwareisnotcompatiblewithPChardware,WINDOWSoperatingsystem,andtheWINDOWSoperatingsystemitselfisimperfect,whichcaneasilycausesystemcrashes.TheoperationandmaintenanceofPCDVRproductsrequiresacertaintechnicalfoundation,andtheoperatingsystemsometimes"washesout"somesystemconfigurationsandsoftware,whichmakesmaintenancedifficult.
PCDVR'sdatastorageandoperatingsystemareintheharddisk,nomatterhowencrypted,youcanenterthesystemfromthebottomofthePCtodeleteandmodifytherecordedimagefiles.IfthezerotrackofthePCharddiskfails,theentireharddiskandeventheentiresystemwillbeparalyzed,sothereliabilityofthedatawilldecrease.
Theanti-intrusioncapabilityoftheWINDOWSoperatingsystemisverypoor.Oncetheoperatingsystemisdamaged(suchasvirusintrusion,etc.),theentirePCDVRwillbeseverelyaffected,oreventhesystemwillcrash.
PCDVRboardsaremass-producedproducts,andthequalitycanbeguaranteed,butitisdifficulttoachievestandardizedmassproductionwhenassembledintoDVRproducts,sothequalityofthewholemachineisalsodifficulttoensure.
ThedevelopmentofallkindsofPCaccessoriesisveryfast,andtheoriginalproductswillbeeliminatedin1to2years.ForDVRproductsthatcanonlybeusedforalongtimetoreflectthecost-effectiveadvantage,themaintenancecostofPCDVRishigher.Atthesametime,thePCboardsarenotdesignedandproducedbythemanufacturersthatproduceDVRproducts,andthereliabilityofthelong-termmaintenanceoftheirproductsislow.
Advantages
Largestoragespace(easytoexpandthestorageharddisk),suitableforlong-termrecording.
Goodman-machineinterfaceandfilemanagement,etc.,anyonewhohasusedacomputerthroughthemouseandkeyboardcanoperatewell;
Softwareandhardwareupgradesarerelativelyeasy,theproductUpdatefast.
Maintenancecostisrelativelylow.Generalfaultscanberepairedbyreplacingparts,andthewholemachinewillnotbescrapped.
TherearealsosomemisunderstandingsaboutembeddedDVRintheindustry.Thecompany’sembeddedDVRsolutionsarebasedontheTriMedia1300andpSOSoperatingsystemsprovidedbyPhilips.Therefore,theindustrymistakenlybelievesthattheembeddedprocessorisTriMedia1300,andtheembeddedoperatingsystemispSOS.Therefore,somearticleshavepositionedthestandardfordetectingembeddedDVRs.WhetherTriMediaandpSOSareused.Infact,therearemanyembeddedprocessors,suchas:Motorola's68K,ColdFire,860,8260,variousARMprocessorswithARMasthecore,IBM'sPowerPCseries,TI'sDSPprocessors,commonMCS51single-chipmicrocomputers,etc.areallembeddedProcessor;Therearealsomanyembeddedoperatingsystems,suchas:VxWorksandpSOSfromWindRiver,NucleusfromATI,WinCEfromMicrosoft,andopensourceembeddedLinux.
ThecurrentstatusofembeddedDVRisthatthereareveryfewcompanieswithindependentdevelopmentcapabilities,andtheirtechnicalandfinancialthresholdsarerelativelyhigh.Generallysmallcompanieshavenolow-levelembeddeddevelopmentcapabilities,andusuallyonlyusesomelow-endforeigncompanies.Duetothelimitationsoftheoriginalsolution,thesolutionsoftheoriginalsolutionarenotflexibleenoughtomeetthediverseneedsofcustomers.Somehavenonetworkfunctions,andsomehavenetworkfunctionsbutarenotstrong.
Thehardwareandsoftwaredesignofembeddedsystemsisusuallymoredifficult,butitprovidesuserswiththefollowingbenefits:
Easytouse,noPCoperatingskillsrequired;embeddedDVRoperationsaregeneralOperatethroughthepanelbuttonsorremotecontrol,aslongasyoucanusehomeappliancessuchasDVD/VCD,youwillusetheembeddedDVR,andyoudon'tneedtolearnhowtomovethemouse,double-clickthemouseandothercomplicatedcomputeroperations.
Thesystemhashighstability,andthesoftwareismorefault-tolerant,withoutspecialmanagement.EmbeddedDVRadoptsembeddedreal-timemulti-taskingoperatingsystem,videomonitoring,compression,storage,networktransmissionandotherfunctionsareconcentratedinasmalldevice.Thereal-timeperformance,stabilityandreliabilityofthesystemaregreatlyimproved,sonospecialmanagementisrequired.,Suitableforunattendedenvironment;
ThesoftwareissolidifiedinFLASH/EPROM,whichcannotbemodifiedandhashighreliability.PCDVRsoftwareisgenerallyinstalledontheharddisk,andtheabnormalshutdownofthesystemmaycausethesystemfilestobedamagedorthesystemharddisktobedamaged,whichwillleadtothecrashoftheentiresystemandpoorreliability.ThesoftwareembeddedintheDVRissolidifiedinFLASH/EPROM,thereisnopossibilityofsystemfilesbeingdamagedorharddiskdamage,andthereliabilityisveryhigh.
Usingembeddedreal-timeoperatingsystem,thesystemturnsonandoffquickly.ThedesktopoperatingsystemsWindows,Linux,etc.usedbyPCDVRsrequirealongswitch-offtimeduetotherelativelylargeoperatingsystemkernel.TheembeddedDVRadoptsanembeddedreal-timeoperatingsystemwhosekernelcanbecut,anditskernelcanbeassmallastensofkilobytes.Theloadingoftheentiresystemkernelandtheinitializationofthedevicecanbecompletedinjustafewseconds,andthereisnoneedtoprotectthesystemfiles.Theshutdowncanbecompletedwithin1to2seconds.
Thecostofsoftwareandhardwareislow.EmbeddedDVRadoptsanintegratedhardwarestructure,noneedtobuygraphicscard,memoryandotherequipmentlikePCDVR,andthehardwarecostislowerthanPCDVR.Thesoftwareusesadedicatedembeddedoperatingsystem,andtheuserdoesnotneedtopaythispartofthecost(theequipmentsupplierwillincludethispartofthecostinthedevelopmentcost),andifthePCDVRadoptsthegenuineWindowssystem,thispartofthecostwillbemorethan2,000yuan,ifitisusedForpiratedoperatingsystems,usersmayalsofacelegalactionsbyMicrosoftforinfringementofintellectualpropertyrights.
Themechanicalsizeissmall,andthestructureissimpleandcompact.TheembeddedDVRhardwareadoptsanintegrateddesign,whichisdifferentfromthePCDVRplug-incardstructure;thewholesystemhasasimplestructure,smallsizeandlightweight,anditalsoimprovesthestabilityandreliabilityofthesystem.
Mainproducts
Digitalharddisk
TheharddiskvideorecorderisreferredtoasDVR(DigitalVideoRecorder).,Adoptingharddiskvideorecording,soitisoftencalledharddiskvideorecorder,alsoknownasDVR.Itisacomputersystemforimagestorageandprocessing,whichhasthefunctionsoflong-termrecording,recording,remotemonitoringandcontrolofimages/voice.Asthewaveofdigitaladvancementcontinuestopenetratetheheartsofthepeople,DVRhasbecomethenewdarlingofdigitalsecurityinthenewcentury.DVRapplicationshavedevelopedfromtheinitialfinancialfieldtotransportation,publicsecurity,environment,intelligentbuildings,squares,computerrooms,examinationrooms,etc.Places,aslongasyouwanttouseimagesandsoundformonitoring,youwillthinkofDVRsystems.DVRhasbecomeahotproductinthefieldofvideosurveillance,andithasbecomeabrightspotincurrentsecurityproducts.
InthesecurityindustryIntraditionalvideosurveillanceprojects,tape-typelong-delayvideorecordersarecommonlyused.Thistypeofvideorecorderusestapeasacarrierforstoringvideodata.Videodataisstoredinananalogmanner.Aftermultiplecopiesofthevideosignal,thesignalattenuationisseriousandthevideotapeisoccupied.Alargeamountofstoragespaceistroublesomeformaintenanceanddataretrieval.Withthedevelopmentofcomputertechnology,thetechnicalupdatesofhardwareandsoftwarehaveprovidednewideasforthestorageofvideodata.
Theprocessingpowerofvideodataisnotenough,sothereisnolarge-scaleapplication.Withthedevelopmentoftechnology,ontheonehand,theprocessingpowerofcomputersisgreatlyenhanced,andICtechnologyisalsoadvancingbyleapsandbounds.Possibly.
Developmentstatus
AfterforeignanalogsurveillanceproductsgrabbedtheChinesemainlandmarketinthe1980s,for20years,foreignbrandsandproductshavealmostdominatedtheworld,despitetheparticipationofsomenationalenterprisesThecompetitioninthisindustryhasneverhadtheopportunitytoformthemainstreamofnationalbrands.Withtherapiddevelopmentofdigitaltechnology,thesecurityfieldhasundergoneacomprehensivedigitaltransformation.Since2000,thedigitalsecuritymarkethasdevelopedrapidly,andanumberofdomesticbrandshavebeenborn.Emergingdigitalsurveillanceproductmanufacturers,amongwhichDVRmanufacturersrepresentedbydigitalsecurityproductshaverisenrapidly.Injustafewyears,theyhaveapplieddigitalsurveillancetechnologytoallwalksoflife,contributingtothestabilityandstabilityofthesociety.Thepositivecontributionhasalsocausedfundamentalchangesintheoriginalsurveillancemarket.Analogsurveillanceproductshavegraduallywithdrawnfromthemarket.DVRhasbeenwidelyusedasamajorcomponentofdigitalsecurityengineering,andnationalbrandproductshavegraduallyoccupiedamajormarketshare..
Fromtheperspectiveoftheindustryasawhole,whatthemarketneedsisanintegrateddigitalmultimediamonitoringsystem.Accordingtotheuser’ssecurityrequirements,combinedwithitsowncivildefense,asecurityprotectionsystemthatmeetsactualneedsisformedtoachieveaudiovisualMonitoring,controlandrecordstorage.Intheprocessofmarketpromotion,DVRproductshavebeenpre-designatedbysomemanufacturersastheuniversaldigitalsurveillancecore.However,thecoreproblemofDVRisonlytosolvethedigitalcompressionandstorageofvideo,andthecontentof"control"isrelativelylacking.Inpracticalmonitoringsystems,DVRplaysamoreimportantroleinreplacingtraditionalanalogvideorecorders,andDVRtechnologyisattheinitialstageofthedevelopmentofdigitalmonitoringsystems.
SincethedevelopmentofDVR,thetechnicalimprovementsandsolutionsproposedbyvariousmanufacturersinresponsetothepracticalneedsofthesecurityindustryandspecialapplicationsindifferentplacescanbedescribedasahundredflowersblooming,fromM-JPEG,MPEG-2topopularMPEG-4,H.264compressiontechnology,fromsoftcompressiontohardcompression,thecontinuousincreaseinthenumberofvideochannels(4,9,16,32,etc.),thenetworkfunctionsofthesystem,etc.,aredazzling.Withvariousapplicationenvironments,DVRproductshavedevelopeddifferentseriesofproducts.Therearevariousbrandsandmodelsonthemarketwithdifferentfunctionalcharacteristics.Ingeneral,accordingtothesystemstructure,itcanbedividedintotwocategories:PC-basedDVRwithPCarchitectureandembeddedDVRwithoutPCarchitecture.PC-styleDVR
TheDVRofthisarchitectureusestraditionalPCasthebasichardware,Win98,Win2000,WinXP(andasmallamountofLinux)asthebasicoperatingplatformsoftware,andisequippedwithimagecaptureorimagecapturecard,Compilethesoftwaretobecomeacompletesystem.ThePCisauniversalplatform,andthePChardwareisupdatedquickly.Therefore,theperformanceofthePC-styleDVRiseasiertoimprove,andthesoftwarerevisionandupgradearealsomoreconvenient.
AttheendofJuly2016,theworld’slastvideorecordermanufacturer,FunaiElectronicsCo.ofJapan,announcedthatitwouldstopproducingvideorecordersduetolowsales.
Instructionsforuse
Becausethevideorecorderisaprecisionelectronicdevicewiththeessenceofelectricity,magnetismandmachinery,itcanbekeptingoodworkingconditiononlyifitisusedcorrectlyandreasonably,anditcanbeusedforextendedperiodsoftime.Life,reducetheoccurrenceoffailures.Whenusingavideorecorder,youshouldgenerallypayattentiontothefollowingpoints:
1.Familiarizewiththeinstructionmanual.Donotusethenewlypurchasedvideorecorderorthefirst-timevideorecorderinanemergency,becausetherearemanytypesofvideorecorders,andtheoperationandusemethodsofvariousmachinesTherearealwayssomedifferences.Therefore,youshouldfirstreadtheinstructionmanualcarefully,clarifythefunctionsandconnectionmethodsoftheswitches,buttons,inputandoutputjacks,andoperatestrictlyinaccordancewiththemethodsspecifiedintheinstructionmanualtoensurethenormaluseofthemachine.Otherwise,notonlymaythemachinenotworkproperly,butalsothedangerofdamage.
2,checkthepowersupplyvoltage,checkwhetherthepowersupplyvoltageofthevideorecorderisalignedwith220V.Whenadjustingthevoltageselector,youmustturnoffthepowerofthevideorecorderandunplugthepowercordfromthepowersocket.Somevideorecordersuseswitchingstabilizedpowersupply,andthevoltagecanbeappliedbetween110-240V,sothereisnoneedtoadjust.
3.Agooduseenvironmentandenvironmentalconditionsdirectlyaffecttheservicelifeofthevideorecorder.Thevideorecordershouldbestoredandoperatedinadry,ventilated,dust-freeenvironment,awayfromvibrationsourcesandstrongmagneticfields.Thevideorecordershouldbeplacedinastableplacetoavoidstrongvibrationandimpact;itshouldalsobeplacedinaventilatedplacetoavoidhightemperatures,notinahumidanddustyplace;itshouldbeplacedasclosetothemonitoraspossibletoshortenthetransmissioncableLength,reducesignallossandexternalinterference.Donotplacethevideorecordernearastrongmagneticfield,becauseworkingunderastrongmagneticfieldwillaffecttheuseeffect,anddonotplaceitneardiluteorvolatilechemicalssuchaspetroleumspirits,alcohol,etc.
FrequentlyAskedQuestions
Question1:Whenthehostisstarted,thereisaphenomenonofthechassisspeakeralarm.Howtojudgeanddealwithit?
ItwillbeissuedwhenthehostisstartednormallyAshort"di",ifthelong"di"beepscyclically,thenthememoryshouldnotbedetected.Mostofthememoryisnotinstalledorthememoryisdamagedandthememoryneedstobereplaced;ifitisonelongortwoshortbeeps,Itshouldbethatthegraphicscardisnotpluggedinwellorthegraphicscardisbrokenandthegraphicscardneedstobereplaced;whenthesystemisrunningnormally,ahigh-frequencyalarmsounds,thenitshouldbethattheCPUisoverheated,theCPUfanisnotgoodforheatdissipation,andtheCPUfanneedstobereplaced.ThehostworkingenvironmenttemperatureistoohighforventilationIftheconditionsarenotgood,itisalsopossiblethattheCPUalarmtemperaturesettinginthemotherboardBIOSistoolowandneedstobeadjustedintime.
Question2:Whenthehoststartstoentertheoperatingsystem,themonitorbecomes16colorsandtheresolutionbecomes640*480(theoriginalgraphicscardandvideocapturecardhavebeeninstalledwithdrivers)
Thisisbecauseavideocapturecardisdamaged.Thevideocapturecardandthegraphicscardconflict,youneedtoreplacethecorrespondingvideocapturecardandre-drivethegraphicsdriver.
Question3:Thekeyboardandmousecannotbeused,howtojudgeanddealwithit?
Ifthekeyboardandmousecannotbeusedatthesametime,itislikelythatthekeyboardlock(KB-LK)isturnedon,checkthekeyboardlock(KB-LK)Isthelighton?Ifit’son,itmeansthekeyboardislocked,justturnitoff;ifonlyoneofthekeyboardandmousecannotbeused,youneedtocheckwhetherthecontactisgood,ifitstillcan’tbeused,thereisThekeyboardandmousemaybedamagedorthereisaproblemwiththemotherboardinterface.Replaceitwithagoodkeyboardandmousetofindtheproblem.
Question4:Whenenteringthesystem,thesystemsuddenlybecomesveryslow,andthesoftwareisrunningWhenIturnonmycomputer,itwillbeveryslow.Howtojudgeanddealwithit?
Ifyoucanenterthesystemnormally,butitisveryslow,firstrestorethesystem(selectmicrosoftwhenthesystemstarts)Windowsandenter,thenenterd:,thenpressenter,thenentercdsetup,pressenter,andthenenterhftoenterthesystemtorecover).Iftherecoveryisstillveryslow,itshouldbeahardwareproblem.Verygood.Itmaybethattheharddiskisbroken.Youneedtofindthedamagedharddiskandreplaceitintime.Itmayalsobethattheharddiskisaddedandthepowersupplyisnotenough.Youcanreplacethepowersupplywiththecorrespondingpoweraccordingtothesituation.
Question5:Thehostcan’tbeturnedon,howtosolveit?
Firstly,ifthemonitorisnotdamaged,judgewhetherthepowersupplyisnormal,thatis,whetherthepowerlightison,ifitisnormal,thenobservewhetherthehostisemittingIfthereisalongbeep,onelongbeep,ortwoshortbeeps,itmeansthatthememoryorgraphicscardisnotworkingproperly.PleaserefertoQuestion1tosolveit;ifthereisnobeep,thenitshouldbethepowersupply,motherboardorCPU.Ifthereisaproblemintheprobabilityofaproblem,thereplacementmethodshouldbeadopted(thatis,thesuspectedproblemcomponentisreplacedwiththeconfirmednormalcomponent,andtheproblemcomponentischeckedonebyone)tofindtheproblemcomponentandreplaceit.TheoperatingfrequencyoftheCPUisnotthedefaultoperatingfrequencyofthecurrentCPU.YouneedtoentertheBIOStoadjusttheCPUfrequencytothecurrentoperatingfrequency.
Question6:OnlytheXunhuilogoappearsonthescreenwhenthesoftwareisstarted,andtherearesixlettersxunhuibelowandnoimagesignal
ThisisthetypeofvideocapturecardselectedwhenthesoftwareisstartedIncorrect,aslongasthecarddriverisadjusted,thecardcanbedisplayednormally(double-clicktoopentheXHDVR-2004.INIfileintheWINNTdirectoryoftheCdrive,andchangethe1inAutoSelect=1to0toreselectthecardwhenthesoftwareisstarted.);Orthevideocapturecarddriverisnotinstalledcorrectly,youneedtoinstallthecorrespondingdriverandthenrestartthehost.
Question7:Whenthesoftwareisstartedorused,achannelwithanimageappearscompletelyblack,anditiscompletelyblackwhenthevideosignalisnotconnected(therearenofivewordswithoutvideosignal)HengyicardsaremoreThisproblemoccurs;orthecolorimagesignalisblackandwhitewhenthechannelmonitoringparametersarenotadjusted.
Thisisbecausethevideocapturecardisdamaged,andtheproblemcanbesolvedbyreplacingthecorrespondingvideocapturecard.
Question8:Ifyouencounteraflickeringscreenwhenenteringthesoftware,
Itmaybethatyoudidnotexitthesoftwarenormallyandrestartthehost;ifthephenomenonstilloccursafterrestarting,thenitshouldbecausedbythegraphicscard.Theproblemshouldbereplacedbythegraphicscardintime.
Question9:Whensettingthetimetable,thereareafewsmallissuesthatneedtobepaidattentionto.
Whensettingmultipletimerecordingsindifferentrecordingmethods,itshouldbenotedthatthesoftwareisrecordingina24-hourmanner,sothestarttimemustbelessthantheendtimewhensettingtheschedule.Ifthesettingof24pointsisexceeded,itneedstobesetintwoperiods(forexample,18.00.00to23.59.59,then0.00.00to7.59.59).Mobilealarmrecordingandalarmrecordingneedtobearmed(includingmanualarmingandarmingaccordingtoschedule),andcontinuousrecordingisnotrequired.
Question10:Whentherecordingmodeisset.Butafteraperiodoftimecannotberecordednormally,howtoeliminateanddealwithit?
Ifallchannelscannotrecord(inthechannelrecordingcontrol,allchannelsarenotintheyellowlightstate.)oritisdisplayedastherecordingstate,buttherecordingfilecannotbegeneratedintheharddisk,thenitshouldbeharddiskgroupingIfsomethinggoeswrong,youneedtoregrouptheharddisksandrestartthesoftware.Iftheproblemisstillnotsolved,allchannelsarestillblue,andthevideofilescannotbedeletedwhenenteringtheoperatingsystem.ThenthepermissionsoftheharddisksshouldbechangedandyouneedtochangeAdjustthepermissionsoftheharddiskback.
Ifitisanalarmrecording,suddenlyoneormorechannelscannotrecordalarms.First,checkwhethertherecordingmodeissetcorrectly.Ifthesettingiscorrect,checkwhetherthedetectionareaofthechannelhasbeenchangedbysomeone.Ifitischanged,thedetectionareaofthechannelneedstobemodifiedagain,andthenrestartthesoftware.
Question11:WhenusingthePTZdevice,itcan'tbecontrollednormally,howtojudgeanddealwithit.
Firstofall,checkifthePTZprotocol,addresscodeandbaudratearethesameastheinstructions.Iftheyareallset,butthePTZcan’tstoprotatingduringcontrol(thenormaloneistoclick,Itrotatesabit.)Thenthereshouldbeaproblemwiththedevice,andthePTZdeviceneedstobereplacedintime.WhenmultiplePTZsareused,theycannotbecontrollednormally.Thenseeifthemodule(232to485)canbedriven.
Question12:Whenusingthenetworkterminal,itcannotbemonitored.Howtodealwithit?
Firstofall,wemustunderstandthatthereareseveralconditionsthatneedtobemettousethenetworksidemonitoring,whetherthenetworksidesettingsaresetup,andwhetherthenetworkissmooth?Forexample,arethe21portsrequiredbytheInternetaccesssoftwareoftheroutermappedtothehost?IsthereafixedIPordomainname?Ifitisalocalareanetworkmonitoring,aslongasitissetupandthenetworkisunblocked(ifthenetworkisnotunblocked,checktheline)andthemaincontrolterminalisopen,youcanmonitor.IfitisWANmonitoring,inadditiontothenetworksideneedstobesetup,seeifthehostcanaccesstheInternet?Ifyoucan'tgetit.CheckwhetherthegatewayandDNSsettingsarecorrect(wherethegatewayandDNSshouldbetheIPoftherouter)?Thenseeiftheroutercanmaptheporttothemonitoringhost?AfixedIPordomainnameisessential.Aslongasseveralconditionsaremet,thereisnoproblemwithmonitoring.
Question13:Themachinerestartsautomatically
Thisphenomenoniscausedbytheuserperformingsomeabnormaloperations,andthecumulativeeffectcausestheWindowssystemtocrash,andthemonitoringhosthasacrashprotectionfunction,namelyRestarttheWindowssystem;inaddition,themachineisplacedinpoorventilationconditions,whichdamagesthechassisorCPUfan,resultingininsufficientheatdissipation,causingthemonitoringhosttocrash.Solutionsuggestions:uninstallthesoftware,andthenreinstallthemonitoringsoftware;improvetheventilationconditions,andreplacethedamagedfan.
Question14:Thesoftwarecannotbeoperated
Whenloggingin,Ididnotenterthecorrespondingusernameandpassword;orIpressedthelogoutbutton.Pleaseclickthere-loginbutton,enterthecorrespondingusernameandpasswordtologin.
Question15:Thechannelpictureisabigpictureafterstartup.
Thismeansthatthesystemcannotdetecttheexistenceofanaudioandvideocompressioncard.Itmaybethatthereisnoaudioandvideoinstalledonyourmachine.Compressioncardorincorrectdriverinstallation,inaddition,someindustrialcomputermotherboardsandcompressioncardcompatibilityisnotgood,thisphenomenonmayalsooccur.Solutionsuggestion:Pleaseruleoutthesepossibilities.
Question16:Thenumberofchannelsisnormal,butthescreenofeachchanneldisplaysmagenta
Pleaseadjustthecolorofthedesktopdisplayattributeto32-bitcolor.
Question17:Thesoftwarestartstoreportanerrorimmediately
Theprobabilityofthiserrorisextremelylow,anditwillnotappearonaproperlymanagedhost.Ingeneral,thereasonsforthisfailureareasfollows:1)Theuser'shostisoftensuddenlypoweredoff;2)Thesoftwarehasbeenrunonamachinewithextremelyunstablehardwareconfigurationformanytimes.Solutionsuggestion:Checkthehostconfigurationandrestartthesoftware.
Question18:Recordingproduceslargefiles
Thissystemfaithfullyrecordsthevideoandaudiosignalsgeneratedbytheboard,andusesexcellentcompressionalgorithmstoensurethatnokeyimageislost.Ensurethereal-timeperformanceofthevideofileplayback.Theusercancalculatetheframenumberofthequestionablevideofilethroughthespecialplayerofthissystem.Generally,thedefaultfilesizeofthesystemisbasicallynormalwithin120M/hour.Ifthelistedconditionsarenotwithinthese,itcanberegardedasabnormal,andyoucanstartfromthefollowingaspects:1.Observethecorrespondingchannelpreviewimage,thepictureshouldbesoft,clear,noflare,andnotdazzling.Ifthereareabnormaldazzlinghighlightsorevenlydistributedsnowflakeflaresontheimage;thisindicatesthattheoriginalvideosignalhastoomuchnoise,pleaseconsideradjustingorreplacingthecamera;2.Thevideoqualityissettoohighandthemovementistooviolent.Thevideoqualitycanbeloweredappropriately.
Question19:Therearemosaicsduringvideofileplayback
Whetherthehostisseverelylackinginresourcesduetootherreasons.Forexample:thehostiscurrentlyperformingamulti-channelplaybackoperationthatexceedsthesystemcapacity.Oncethehost'sresourcesareexhaustedandthevideodatacannotbedecodednormally,mosaicsmayoccur.
Question20:Thepreviewonthenetworksidehasasenseofanimation
Thenetworkcommunicationbandwidthisnotenough.Atthistime,thevideoqualityofthehostsidecanbeappropriatelylowered.
Selectionguide
Videotaperecorders
Videotaperecordersaredividedaccordingtorecordabletime,whichcanbedividedinto24h,48h,72h,96h,120h,240h,480h,720h,960handothertypes.
Digitalharddiskvideorecorder
DigitalharddiskvideorecordersignalcompressionmethodsincludeMPEG-1,MPEG-2,MPEG-4,JPEGandM-JPEG.
(1)TherecordingspeedofMPEG-1andMPEG-2signalcompressionmethodsisgreaterthanorequalto25framespersecond(real-timerecording).
(2)TherecordingspeedofJPEGandM-JPEGsignalcompressionmethodsisabout10framespersecond(non-real-timerecording).
Keypointsforvideorecorderselection
(1)Itisavailableforreal-timeintermittentrecordingandplaybackatstandardspeedandmultiplechoices.
(2)Ithasthefunctionofstartingandstoppingrecordingaccordingtothespecifiedtime,andisequippedwithadateandtimeandcamerapositioncodegeneratortorecordthedate,timeandpositioncode,andcanbedisplayedonthemonitor.
(3)Accordingtoreal-timerecordingornon-real-timerecordingrequirements,selectthedigitalharddiskvideorecordersignalcompressionmethodandharddiskcapacity.
(4)Thedigitalharddiskvideorecordercanselecttechnicalindicatorssuchasscreendivisionprocessing,cameracontrol,andalarmlinkageaccordingtotheneedsofsystemfunctions.