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.