Delta Embedded DVR User Manual download pdf (Page 79)

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7. APPENDIX

7.1. TERMS

Dualstream

Dual‐stream:onehighbitratestreamforthelocalHDstore,QCIF/CIF/2CIF/DCIF/4CIFcoding,other

lowbitratestreamfornetworktransmission,suchasQCIF/CIFcoding, 

IFrame

Iframe:intraframeimage,removeredundantinformationtocompressthetransmittaldata,also

calledkeyframes.

BFrame

Bframe:Accordingtotimeredundantofthesourceimagesequencepreviouslyencodedframeand

account  thesourceimageaftertheencodedframetocompresstransmittaldata,alsoknownas

bi‐directionalpredictionframe.

PFrame

P‐frame:accordingtoimageframelowerthantheprevious’timeredundanttocompresstransmittal

data,alsocalledpredictedframes.

WideDynamic

Brightpartsanddarkpartsinparticularcanbeseenveryclearlyatthesametime.Widedynamic

rangeisaratiobetweenthebrightestluminancesignalvalueandthedarkestvalue.

S．M．A．R．T

SMART(SelfMonitoring,AnalysisandReportingTechnology):nowwidelyusedinharddiskdata

securitytechnology,monitoringsystemanalysisMotor,circuit,HDDanddiskheadwhenHDDworking,

warnwhenabnormality,sometimeswillautomaticallyslowdownandbackupdata.

CVBS

CompositeVideoBroadcastSignal,consistsofluminanceandcolorsignalfromthecomposite

basebandsignal.

BNC

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Delta Embedded DVR User Manual Page 79