Periaate
Videonauhuri on televisio-ohjelmien tuotannon perustyökalu.Videonauhurin kehitysprosessi on myös siirretty analogisesta signaalimuodosta digitaaliseen signaalimuotoon.Koska videosignaalin käsittely on4:2:2,4:1:1,4:2:0:01,4:2-muotoinen-d-muotoinen CT- ,kehyksen sisäinen DCT ja MPEG-2. Bittinopeuden pakkaussuhde on erilainen, ja tallennusKoodausnopeus on noin 200 Mbps, 100 Mbps, 50 Mbps ja 25 Mbps. Nauhan leveys on 3/4, 1/2, 1/4 tuumaa, MP ja ME ja pian.Digitaalisten videonauhureiden formaatit ovat erilaisia.
Digitaalinen DV-muoto
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.
Digitaalinen DVCAM-muoto
DVCAOhjautuu myös menestyksekkäästi ammattimaiseen digitaaliseen komponenttivideokameraan, joka perustuukotiDV-muotoon.LikeDVCRRO25:n tavoitteena on korkea kuvanlaatu, pieni koko, kevyt ja alhainen hinta. Se käyttää 4:2:0-näytteenottomuotoa, 8-bittistä kvantisointia ja DCT:tä,2-koodia,5 Mt-pakkaustiheyttä. S,signaalin ja kohinan välinen suhde on suurempi kuin 54 dB, ja siinä on 2-kanavainen 48KHZ, 16-bittinen kvantisointi.Digitalaudio.Ituses1 /4 tuuman metallihiukkasnauha, jonka raidanleveys on 15 mikronia.Se on kaksisuuntainen yhteensopiva kotitalouksien DV-formaatin kanssa, eli DV:tä varten mattapesää voidaan toistaaDVCAM-videonauhurit,jaDVCAM-videonauhureiden tallentamiaDV-nauhoja.
Digitaalinen betakameramuoto
Digitaalisen beetakameran signaalin ja kohinan välinen suhde voi olla 62 dB, ottaa käyttöön 4:2:2-näytteenottomuodon, 10-bittisen kvantisoidun digitaalisen komponentinkäsittelyn, ja käyttää DCT-pohjaista elektroniikkaa Flatatadaptive-frame-pakkaus,pakkaussuhde 4-ampeerikanava2:1,-kanava 2:1,-H. 0-bittinen digitaalisen äänen kvantisointi. Se voi kopioida 30 sukupolvea kuvanlaatua heikentämättä laatua ja on yhteensopiva Betacam-SPanalog-komponenttimuodon videonauhojen toiston kanssa.
DigitalBetacamSX-muoto
ThedigitalintegratedcamcordersanddigitalvideotaperecordersofthisformatseriesuseadvancedMPEG-24:2:2P@MLcompressionalgorithm,Compressionratio10:1,canrecord8bit4:2:2digitalcomponentvideosignals,andcanrecordandreproduce4channelsof16bituncompresseddigitalaudiosignals,using1/2inchmetalparticletape,andcompatiblewithreproducinganalogsignalsBetacamandBetacamSPformatbelts(providedbyDNW-A65PandDNW-A75P),whichmakesthetransitionofBetacamSXtoafullydigitalenvironmentmoreeconomicalandreasonable.
Digitaaliset DVCPRO25- jaDVCPRO50-muodot
DVCPRO-muoto
Kuvankäsittelyssä käytetään suurta määrää 4:1:1-standardimuotoja,eli näytteenottotaajuuden kirkkaus = 13,5 MHz, väriero PB,R = 3,375 MHz. 1kaistan ulkopuolinen signaali interpoloitu muotoon 4:2 :2muotosignaali.Tulostulo.Tietoarvosta katsottuna 4:2:2-muodon nettotietoarvo [(720+2×360)×576×8]×25≈165,9 Mbps, muutettu 4:1:1:ksi,itis[(720+2×180)×5 ]×25≈124,4Mbps,pakattu 25Mbps:iin tallennusta varten,pakkaussuhde on 124,4Mbps/25Mbps≈5:1.Käyttämällä 1/4 tuuman MPnauhaa,se voi tallentaa jopa4 kanavaa16-bittisiä digitaalisia äänisignaaleja.
DVCPRO50-muoto on standardi 4:2:2tulo ja lähtö,jasisäinen käsittely on myös 4:2:2-muotoinen, videon datanopeus on 50 Mbps, pakkaussuhde = 165,9 Mbps/50 Mbps≈3,3:1.Varmistaa korkealaatuisten digitaalisten kuvien lähetys- ja kaapelilähetys. MPnauha,ja voi tallentaa ja toistaa ohjelmia, jotka on tallennettu DVCPRO-muodossaDVCPRO-muodossa.
DigitalDigital-S(D9)-muoto
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.
PCtyyppi
Teollinen tietokonePCDVR
IndustrialcomputerPCDVRadoptsindustrialcontrolchassis,whichcanresisttheharshandinterferenceofindustrialenvironment.UsingCPUindustrialintegratedcardandindustrialbackplane,itcansupportmorevideoandaudiochannelsandmoreIDEharddisks.Ofcourse,itspriceistwoorthreetimesthatofageneralcommercialPC.Itisoftenusedinvariousimportantoccasionsandsituationsthatrequirealargenumberofchannels.
CommercialmachinePCDVR
CommercialmachinePCDVRgenerallyalsousesindustrialcontrolchassistoimprovethestabilityandreliabilityofthesystem,andthenumberofvideoandaudiochannelsislessSomealsouseordinarycommercialPCcases.ItusesageneralPCmotherboardandvariousboardstomeettherequirementsofthesystem.Itischeapandadaptabletotheenvironment.Itisoftenusedinvariousgeneraloccasions,andthenumberofimagechannelsisgenerallylessthan24.
PalvelinPCDVR
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.
WINDOWS-käyttöjärjestelmän tunkeutumisenestokyky on erittäin heikko. Kun käyttöjärjestelmä on vaurioitunut (kuten virustunkeutuminen jne.), koko PCDVR:ään vaikuttaa jatkuvasti, tai järjestelmä kaatuu.
PCDVRboardsaremass-producedproducts,andthequalitycanbeguaranteed,butitisdifficulttoachievestandardizedmassproductionwhenassembledintoDVRproducts,sothequalityofthewholemachineisalsodifficulttoensure.
ThedevelopmentofallkindsofPCaccessoriesisveryfast,andtheoriginalproductswillbeeliminatedin1to2years.ForDVRproductsthatcanonlybeusedforalongtimetoreflectthecost-effectiveadvantage,themaintenancecostofPCDVRishigher.Atthesametime,thePCboardsarenotdesignedandproducedbythemanufacturersthatproduceDVRproducts,andthereliabilityofthelong-termmaintenanceoftheirproductsislow.
Edut
Suuri tallennustila (helppo laajentaa tallennuskiintolevyä), sopii pitkäaikaiseen tallennukseen.
Goodman-koneliitäntä ja tiedostonhallinta jne., jokainen uusi, joka on käyttänyt tietokonetta hiiren ja näppäimistön kautta, voi toimia hyvin;
Ohjelmisto- ja laitteistopäivitykset ovat suhteellisen helppoja, tuotepäivitys on nopea.
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.
Päätuotteet
Digitaalinen kiintolevy
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.
Usein kysytyt kysymykset
Kysymys 1: Kun isäntä aloitti, esiintyyilmiö kotelon kaiuttimen hälytyksestä. Kuinka arvioida ja käsitellä sitä?
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.
Kysymys 3: Näppäimistöä ja hiirtä ei voi käyttää, kuinka arvioida ja käsitellä niitä?
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.
Kysymys 5: Isäntäkonetta ei voida palauttaa, kuinka ratkaista se?
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.
Kysymys 8: Jos kohtaat näytön välkkymistä, kun siirryt ohjelmistoon,
Itmaybethatyoudidnotexitthesoftwarenormallyandrestartthehost;ifthephenomenonstilloccursafterrestarting,thenitshouldbecausedbythegraphicscard.Theproblemshouldbereplacedbythegraphicscardintime.
Kysymys 9: Aikataulua määritettäessä on muutama mallikysymys, johon on kiinnitettävä huomiota.
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.
Kysymys 11: Kun käytät PTZ-laitetta, sitä ei voida hallita normaalisti, kuinka arvioida ja käsitellä sitä.
Firstofall,checkifthePTZprotocol,addresscodeandbaudratearethesameastheinstructions.Iftheyareallset,butthePTZcan’tstoprotatingduringcontrol(thenormaloneistoclick,Itrotatesabit.)Thenthereshouldbeaproblemwiththedevice,andthePTZdeviceneedstobereplacedintime.WhenmultiplePTZsareused,theycannotbecontrollednormally.Thenseeifthemodule(232to485)canbedriven.
Kysymys 12: Kun käytät verkkopäätettä, sitä ei voida valvoa. Kuinka käsitellä sitä?
Firstofall,wemustunderstandthatthereareseveralconditionsthatneedtobemettousethenetworksidemonitoring,whetherthenetworksidesettingsaresetup,andwhetherthenetworkissmooth?Forexample,arethe21portsrequiredbytheInternetaccesssoftwareoftheroutermappedtothehost?IsthereafixedIPordomainname?Ifitisalocalareanetworkmonitoring,aslongasitissetupandthenetworkisunblocked(ifthenetworkisnotunblocked,checktheline)andthemaincontrolterminalisopen,youcanmonitor.IfitisWANmonitoring,inadditiontothenetworksideneedstobesetup,seeifthehostcanaccesstheInternet?Ifyoucan'tgetit.CheckwhetherthegatewayandDNSsettingsarecorrect(wherethegatewayandDNSshouldbetheIPoftherouter)?Thenseeiftheroutercanmaptheporttothemonitoringhost?AfixedIPordomainnameisessential.Aslongasseveralconditionsaremet,thereisnoproblemwithmonitoring.
Kysymys 13: Kone käynnistyy automaattisesti
Thisphenomenoniscausedbytheuserperformingsomeabnormaloperations,andthecumulativeeffectcausestheWindowssystemtocrash,andthemonitoringhosthasacrashprotectionfunction,namelyRestarttheWindowssystem;inaddition,themachineisplacedinpoorventilationconditions,whichdamagesthechassisorCPUfan,resultingininsufficientheatdissipation,causingthemonitoringhosttocrash.Solutionsuggestions:uninstallthesoftware,andthenreinstallthemonitoringsoftware;improvetheventilationconditions,andreplacethedamagedfan.
Kysymys 14: Ohjelmistoa ei voi käyttää
Whenloggingin,Ididnotenterthecorrespondingusernameandpassword;orIpressedthelogoutbutton.Pleaseclickthere-loginbutton,enterthecorrespondingusernameandpasswordtologin.
Kysymys 15: Kanavakuva on iso kuva käynnistyksen jälkeen.
Thismeansthatthesystemcannotdetecttheexistenceofanaudioandvideocompressioncard.Itmaybethatthereisnoaudioandvideoinstalledonyourmachine.Compressioncardorincorrectdriverinstallation,inaddition,someindustrialcomputermotherboardsandcompressioncardcompatibilityisnotgood,thisphenomenonmayalsooccur.Solutionsuggestion:Pleaseruleoutthesepossibilities.
Question16:Thenumberofchannelsisnormal,butthescreenofeachchanneldisplaysmagenta
Säädä työpöydän näytön värimäärite 32-bittiseksi.
Kysymys 17: Ohjelmisto alkaa tallentaa välittömästi
Theprobabilityofthiserrorisextremelylow,anditwillnotappearonaproperlymanagedhost.Ingeneral,thereasonsforthisfailureareasfollows:1)Theuser'shostisoftensuddenlypoweredoff;2)Thesoftwarehasbeenrunonamachinewithextremelyunstablehardwareconfigurationformanytimes.Solutionsuggestion:Checkthehostconfigurationandrestartthesoftware.
Kysymys 18: Tallennus tuottaa suuria tiedostoja
Thissystemfaithfullyrecordsthevideoandaudiosignalsgeneratedbytheboard,andusesexcellentcompressionalgorithmstoensurethatnokeyimageislost.Ensurethereal-timeperformanceofthevideofileplayback.Theusercancalculatetheframenumberofthequestionablevideofilethroughthespecialplayerofthissystem.Generally,thedefaultfilesizeofthesystemisbasicallynormalwithin120M/hour.Ifthelistedconditionsarenotwithinthese,itcanberegardedasabnormal,andyoucanstartfromthefollowingaspects:1.Observethecorrespondingchannelpreviewimage,thepictureshouldbesoft,clear,noflare,andnotdazzling.Ifthereareabnormaldazzlinghighlightsorevenlydistributedsnowflakeflaresontheimage;thisindicatesthattheoriginalvideosignalhastoomuchnoise,pleaseconsideradjustingorreplacingthecamera;2.Thevideoqualityissettoohighandthemovementistooviolent.Thevideoqualitycanbeloweredappropriately.
Kysymys 19: Videotiedostojen toiston aikana on osavärejä
Whetherthehostisseverelylackinginresourcesduetootherreasons.Forexample:thehostiscurrentlyperformingamulti-channelplaybackoperationthatexceedsthesystemcapacity.Oncethehost'sresourcesareexhaustedandthevideodatacannotbedecodednormally,mosaicsmayoccur.
Kysymys 20:Verkkopuolen esikatselussa on ollut animaatiota
Thenetworkcommunicationbandwidthisnotenough.Atthistime,thevideoqualityofthehostsidecanbeappropriatelylowered.
Valintaopas
Videonauhurit
Videonauhurit jaetaan tallennusajan mukaan,joka voidaan jakaa 24h,48h,72h,96h,120h,240h,480h,720h,960käsityyppeihin.
Digitaalinen kovalevyvideotallennin
Digitaalinen kiintolevyvideotallentimen signaalinpakkausmenetelmiä ovat MPEG-1, MPEG-2, MPEG-4, JPEG ja M-JPEG.
(1)MPEG-1- ja MPEG-2-signaalinpakkausmenetelmien tallennusnopeus on suurempi kuin 25 kuvaa sekunnissa (reaaliaikainen tallennus).
(2)JPEG- ja M-JPEG-signaalinpakkausmenetelmien tallennusnopeus on noin 10 kuvaa sekunnissa (ei-reaaliaikainen tallennus).
Avainkohdat videonauhureiden valinnassa
(1)Se on saatavilla reaaliaikaiseen jaksottaiseen tallennukseen ja toistoon vakionopeudella ja useilla valinnoilla.
(2)Ithasthefunctionofstartingandstoppingrecordingaccordingtothespecifiedtime,andisequippedwithadateandtimeandcamerapositioncodegeneratortorecordthedate,timeandpositioncode,andcanbedisplayedonthemonitor.
(3)Valitse reaaliaikaisen tallennuksen tai ei-reaaliaikaisen tallennuksen vaatimusten mukaisesti digitaalisen kiintolevyn videotallentimen signaalinpakkausmenetelmä ja kovalevyn kapasiteetti.
(4)Thedigitalharddiskvideorecordercanselecttechnicalindicatorssuchasscreendivisionprocessing,cameracontrol,andalarmlinkageaccordingtotheneedsofsystemfunctions.