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PESQ
PESQ, ''Perceptual Evaluation of Speech Quality'', is a family of standards comprising a test methodology for automated assessment of the speech quality as experienced by a user of a telephony system. It is standardised as ITU-T recommendation P.862 (02/01). Today, PESQ〔http://www.itu.int/rec/T-REC-P.862/en ITU-T Recommendation P.862: Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs〕 is a worldwide applied industry standard for objective voice quality testing used by phone manufacturers, network equipment vendors and telecom operators. Its usage requires a license.
== Measurement scope ==
PESQ was particularly developed to model subjective tests commonly used in telecommunications (e.g. ITU-T P.800) to assess the voice quality by human beings. Consequently, PESQ〔 employs true voice samples as test signals. In order to characterize the listening quality as perceived by users, it is of paramount importance to load modern telecom equipment with speech-like signals. Many systems are optimized for speech and would respond in an unpredictable way to non-speech signals (e.g. tones, noise). Guidelines for proper applications of voice test samples are defined in the PESQ application guide ITU-T P.862.3.
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