Exfo EXpert IPTV Test Tools (FTB-200v2) Bedienungsanleitung PDF herunterladen (Seite 60)

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VQmon/HDcalculatesqualitymetricsintheseburstandgapstates,andthencombinesthem

togeneratetheoverallqualityscoreonuserexperi ence.Thesecalculationsarebasedonthe

resultsofnumerouss ubjectivevoice/videoqualityanalysisteststhatindicatethereisnotan

instantaneouschangeinperceivedqualitywhenatransitionbetw

eenthegapandburststates

occurs,butratherthattheperceivedqualityexponentially“decays”fromonelevelto

another.Forexample,a100‐millisecondburstof“noise”ismuchlessannoyingthana10

secondburstof“noise”.

Figure2‐8illustratestheVQmon4‐stateMarkovmodel.TheVQmon4‐stateMarkovmodelis

define

dashavingthefollowingstatesandassociatedtransitions:

Table2‐1.VQmon4‐stateMarkovmodelstatetransitiondescriptions

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Exfo EXpert IPTV Test Tools (FTB-200v2) Bedienungsanleitung Seite 60