MOS is an example of numbers for a specified code. Because MOS testing requires carefully designed and controlled test scenarios, the best way to do a MOS test is outside its source. See Codec. Target Model E-Model is another sound system that meets objective quality criteria based on packet loss, jitter and delay. E-Model reports are conveyed as R values. The following is a close relationship between the MOS quality assessment and the E-Model. Thematic Explanation MOS R Perfect 5.0 100 Very good - almost not satisfied 4.5 90 Very good - Very good 4.0 80 Good - some people are not satisfied 3.6 70 Fair - many are not happy 3.1 60 Bad - yes very bad 2.6 50 Bad - 1.0 0 not recommended
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