Exfo EXpert IPTV Test Tools (FTB-200v2) Manuel d'utilisateur télécharger pdf (Page 61)

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Figure2‐8.

VQmonFour‐stateMarkovModel

diagram

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A.2.2 AudioStreamAnalysis

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VQmon/HD’saudioqualityanalysisalgorithmperformsreal‐timeanalysisofaudio

streampacketsandgeneratesperceptualqualityscores(MOS‐A)andothermetrics

correspondingtothoseproducedbythevideoqualityanalysisalgorithm.Likethevideo

streamanalysisalgorithm,theaudioqualityanalysisalgorithmcalculatestheimpactoftime‐

varyingimpairments(i.e.,burstpa

cketlossandjitter)andrecencyonperceptualquality.

VQmon/HDcalculatesoverallmultimediaquality(MOS‐AV)bymeasuringbothaudioand

videoperceptualqualityandtheaccuracyoftheaudio‐videosynchronization.

High‐fidelityaudiocodecssupportedbyVQmon/HDinclude:

 MPEG‐1Layer1,2,and3

 MPEG‐2AdvancedAudio

Coding(AAC)

 AC‐3

 MPEG‐4AAC,LowDelayAAC,andHighEfficiencyAAC

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Exfo EXpert IPTV Test Tools (FTB-200v2) Manuel d'utilisateur Page 61