EXFO EXpert IPTV Test Tools (FTB-200v2) - Manual (Page 61)

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Figure 2‐8.
VQmon Four‐state Markov Model
diagram
A.2.2 Audio Stream Analysis
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 packet 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