BASIC STUDY ON THE SPEECH TRANSMISSION INDEX TAKING CHARACTERISTICS OF SPEECH RATE IN REVERBERANT AND ECHOIC SOUND FIELDS INTO CONSIDERATION
Osamu Hashimoto, Sho Kimura, Masayuki Sato · Journal of Architecture and Planning (Transactions of AIJ) · 2000
The results of tri-syllable articulation and intelligibility tests with varying speech rates in reverberant and echoic sound fields reveal that both articulation and intelligibility scores tend to be higher when speech is presented at a slower speech rate. The results that we obtained, however, show that speech is more audible at speech rates near the speed of general conversation in sound fields in which intelligibility is sufficiently secured. In this paper, we propose a new speech transmission index taking into consideration the characteristics of speech rates for the purpose of quantitatively grasping the impact of such changes in the speech rate on speech transmission quality. Since the results of our calculations and the results of subjective evaluations indicated a similar tendency, we feel that it will be possible for us to develop this new evaluation index as a physical evaluation method for speech transmission quality taking speech rate into consideration.