The intelligibility of speech in the presence of an echo and of noise
an example of some phonetic transitions
Publication du LMA (Laboratoire de Mécanique et d'Acoustique,
effet de coloration
The intelligibility of speech in noise is a good example of the detection of a real signal. The presence of an echo of the original signal or direct sound (by analogy with room acoustics) has an obvious interest, because an early echo increases 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. Those 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.