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What is Mean Opinion Score (MOS)

Encyclopedia of Information Science and Technology, Third Edition
Subjective quality assessment score obtained during psycho-visual experiments.
Published in Chapter:
Modeling Image Quality
Gianluigi Ciocca (Università degli Studi di Milano-Bicocca, Italy), Silvia Corchs (Università degli Studi di Milano-Bicocca, Italy), Francesca Gasparini (Università degli Studi di Milano-Bicocca, Italy), and Raimondo Schettini (Università degli Studi di Milano-Bicocca, Italy)
Copyright: © 2015 |Pages: 11
DOI: 10.4018/978-1-4666-5888-2.ch590
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More Results
The Playout Control Management: An Issue for the IP Telephony Service Providers
A common measure 8from 1 (bad) to 5 (excellent)) for subjective speech quality is the Mean Opinion Score (MOS) scale, defined in the ITU-T standard P.800. In a MOS test, the test persons listen to short speech samples, where every speech sample consists of two to five sentences. The total MOS score is then the mean of all individual results. Due to the absolute nature of the grading, this kind of test is also called an Absolute Category Rating (ACR) test. (from
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The Impact of Network-Based Parameters on Gamer Experience
MOS provides a numerical indication of the perceived quality of received media after compression and/or transmission. The MOS is expressed as a single number in the range 1 to 5, where 1 is lowest perceived quality and 5 is the highest perceived quality.
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Perception-Based Speech Quality Measurement in Modern Telecommunications
Average value of all the rating scores registered by the human listeners (conducting a subjective voice quality test) for a given test condition.
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