残響音場における残響とエコーが音声聴取に与える影響

Abstract

In this research, we carried out psychological scale measurements of "ease of hearing" in reverberant sound fields with differing echo-diagram response properties, such as changes in the reverberation time and the presence of discreet echoes in the reverberation attenuation process, as well as STI measurements and tri-syllable articulation tests varying speech rates between four patterns and conducted comparative examinations of the effect of echoes and reverberation on speech intelligibility from the correspondence relationships of the outcome of these tests. As a result, in regard to the evaluation of tri-syllable articulation with varying speech rates, we recognized a trend in which the effect on the length of reverberation, the presence of discreet echoes or other changes in the time structure could be evaluated as the differences in the test results. Meanwhile, in regard to STI, we confirmed that, in some cases, differences in "ease of hearing" cannot be reflected as evaluation results in sound fields with long reverberation time or in sound fields affected by directional discreet echoes.