STOI (Short-Time Objective Intelligibility)

Short-Time Objective Intelligibility (STOI) is an objective metric that predicts how understandable speech will be to a listener, typically scored from 0 to 1, with higher being more intelligible. Unlike quality metrics such as PESQ or MOS, STOI focuses specifically on intelligibility, making it valuable for evaluating speech enhancement, denoising, and separation in noisy conditions.