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Low Delay Communication and Multimedia Applications
Table 5.3 Speech transmission user satisfaction
E-Model Rating quality category MOS
90 ≤ R < 100 Best Very satisfied 4.3 ≤ MOS < 100
80 ≤ R < 90 High Satisfied 4.0 ≤ MOS < 4.3
70 ≤ R < 80 Medium Some users dissatisfied 3.6 ≤ MOS < 4.0
60 ≤ R < 70 Low Many users dissatisfied 3.1 ≤ MOS < 2.6
50 ≤ R < 60 Poor Nearly all users dissatisfied 1.0 ≤ MOS < 2.6
methods have been proposed and this theme is still a matter of discussion. Some
methods currently in use are:
PESQ – Perceptual evaluation of speech quality (ITU-T 1998).
PEVQ – Perceptual evaluation of Video Quality (ITU-T ...