L'intelligibilité de la parole en présence d'un écho et de bruit

Abstract
The intelligibility of speech is a good example of the detection of a real signal in noise. The presence of an echo of the original signal or direct sound (by analogy with the room acoustics) has an obvious interest, because an early echo increases the intelligibility, while a delayed echo deteriorates it. Recent works have shown that the auditory integration of an echo with a short delay is not complete in the presence of noise. These measurements were performed using intelligibility scores. We have measured the Speech Reception Threshold (SRP) corresponding to a given intelligibility score for various phonetic transitions and various delays. The results show irregular variations of the SRP according to the delay and phonetic transitions.