円弧状に湾曲した残響性トンネル内での音響伝搬と音声の聴取

概要

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Transmission of correct speech in underground is essential to keep people safe in case of emergency. On the other hand, sound propagation characteristics is influenced by acoustical conditions of the sound field. From the viewpoints, sound propagation experiments, hearing tests of speech by subjects and measurements of RASTI are conducted in a reverberant curved tunnel. From measurements of pink noise propagation, relative attenuations less than 315 Hz are much small, and those at higher frequencies rapidly increase with distance. The attenuations may be influended by not only absorption characteristics but also the curved feature of the tunnel. While hearing scores of speech decrease with distance, differences between the scores are observed and may depend on the kinds of speech. From analyzing the hearing results, mistakes are occurred by influences of both reverberant condition near the sound source and degradation of signal-to-noise ratio of speech signal due to many times of reflection at further points. Positive correlation is observed between RASTI and scores of the articulation syllables. Relationships between RASTI and scores of the other speech are indicated through the results of articu1ation tests. Possibility on prediction of speech transmission by the objective physical measurements is suggested.
社団法人日本音響学会の論文