ESCA Workshop on Audio-Visual Speech Processing (AVSP'97)

September 26-27, 1997
Rhodes, Greece

The Effects of Speaking Rate on Visual Speech Intelligibility

Jean-Pierre Gagné, Lina Boutin

Ecole d'orthophonie et d'audiologie, Universite de Montreal, Montreal, Quebec, Canada

The effect of speaking rate on visual-speech intelligibility of talkers was investigated. Seven talkers were videotaped while they spoke a list of 25 sentences twice using conversational and clear speech. For each talker, the average overall speaking rate of the conversational and clear sentences was measured. The recordings were digitized and dubbed under four conditions: (1) normal conversational, (2) conversational speech decelerated to a speed equivalent to the speaking rate of the talker's average utterances of clear speech, (3) natural clear speech, (4) clear speech accelerated to a rate equivalent to the talker's average conversational speech. The test items were completely randomized and shown to a group of subjects. The subjects responses were used to determine the speech intelligibility of each talker for the four experimental conditions. The results suggest that overall speaking rate alone does not account for differences in visual-speech intelligibility between conversational and clear speech. [Work supported by NSERC].

Full Paper

Bibliographic reference.  Gagné, Jean-Pierre / Boutin, Lina (1997): "The effects of speaking rate on visual speech intelligibility", In AVSP-1997, 29-32.