Microtronix today announed the launch of their new Perceived Evaluation of  Speech Quality (PESQ) / Mean Opinion Score (MOS) option.

PESQ, Perceptual Evaluation of Speech Quality, is mechanism for automated assessment of the speech quality enjoyed by the user of a telephony system. It is standardised as ITU-T recommendation P.862 (02/01). 

In multimedia (audio, voice telephony, or video) especially when codecs are used to compress the bandwidth requirement (for example, of a digitized voice connection from the standard 64 kilobit/second PCM modulation), the mean opinion score (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.

MOS tests for voice are specified by ITU-T recommendation P.800

The MOS is generated by averaging the results of a set of standard, subjective tests where a number of listeners rate the heard audio quality of test sentences read aloud by both male and female speakers over the communications medium being tested.


Read our Discussion paper on Perceptual Evaluation of Speech Quality (PESQ)


Contact Microtronix or your local Microtronix representative for details.

Microtronix offers a variety of technical services, please call us if you have any questions and a qualified technician will be happy to assist you. Telephone: 1 (519) 649 4900

Microtronix Systems Ltd.
3345 Woodhull Rd.
London, Ontario, N6P 1P2


Telephone: 1.519.649.4900
Fax: 1.519.649.0355