PESQ (Perceptual Evaluation of Speech Quality)

Perceptual Evaluation of Speech Quality (PESQ) is a standardized objective metric that estimates how good speech sounds, designed to approximate the scores human listeners would give. Originally developed for telephony, it is widely used to evaluate speech enhancement and noise reduction. It complements intelligibility metrics like STOI, which measure how understandable speech is, and the subjective MOS, which uses real listeners.