Exfo EXpert IPTV Test Tools (FTB-200v2) Bedienungsanleitung PDF herunterladen (Seite 62)

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A.2.3 TelchemyVideoQualityMetrics

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VQmon/HDprovidesreal‐timeperceptualqualityscores,performance

statistics,andextensivediagnosticdataformonitoredvideostreamsintheformof

theTVQM™(TelchemyVideoQualityMetrics)dataset.

TVQMmetricsreportedbyVQmon/HDfallintothreemaincategories:

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a)PerceptualQualityMetrics–includingMeanOpinionScores(MOS)forpicture

quality(MOS‐V),audioquality(MOS‐A),andcombinedaudio‐videoquality(MOSAV),

expressedinarangeof1to5,with5beingbest.Forpicturequality,both“Relative”

MOS(whichdoesnotconsidertheresolutionofthedisplay,framerate,orprogressive

vs.interlacedscanning)and“Absolute”MOS(whichincludesconsiderationofthese

factors)arereported.

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TVQMperceptualqualitymetricsalsoincludeanEstimatedPeakSignal‐to‐NoiseRatio

(ESPR)indB,andasetofmetricsindicatingtheseveritylevel(onscaleof010)of

severaldegradationfactorsincludingpacketloss,jitter,codectype,etc.

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b)VideoStreamMetrics–includingvideostreamdescription(imagesize,codectype,

framerate,etc.);contentandsceneanalysis(detailandmotionlevel)metrics;frame

statisticsindicatingthenumberandproportionofeachframetype(I,B,P,SI,andSP)

received/impaired/lost/discarded;averageandmaximumbandwidthforeachframe

typeandforthestreamoverall;videostreamjitteranddelaymetrics;andinterval

metrics.

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c)TransportMetrics–includingVSTQ(VideoServiceTransmissionQuality),a0‐50

codec‐independentscorethatmeasurestheabilityoftheIPTVnetworktocarry

reliablevideo;packettransportmetrics(packetsreceived/discarded/duplicate/out‐of‐

sequence,alongwithburstandgapstatistics);packetjittermetricsincludingPPDV

(Packet‐to‐PacketDelayVariation);FEC(ForwardErrorCorrection)andReliableUDP

metrics;andMPEG‐2TransportStream(ETSITR101290)metrics.

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Exfo EXpert IPTV Test Tools (FTB-200v2) Bedienungsanleitung Seite 62