EXFO EXpert IPTV Test Tools (FTB-1 / 2 Pro) - Manual (Page 59)

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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