散乱音々場における"話しやすさ"について

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  • Difficulty in speaking in reverberant sound field
  • サンランオンクリカエシジョウ ニ オケル ハナシ ヤスサ ニ ツイテ

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Difficulty in speaking when a single echo is presented to the speaker has been described in a previous paper. We have continued the study on the difficulty in speaking in reverberant sound, using the same technique of simulated sound field. When two or more echoes are presented to a speaker, these echoes have two interesting influences on the criterion of difficulty in speaking. One is the precedence effect in which categories of "no difficulty in speaking" are extended by a preceding echo about 5 dB below the result of single echo, and other is the backward masking effect in that these categories are extinguished by a following echo of a level about 5 dB above the result of single echo. (Fig. 1, Fig. 2, Fig. 3, and Fig. 4) Favorable condition for "speaking" in a sound field composed of reflected and reverberant sound is 10 log(E_1+E_r)/E_t=-20〜-5dB where E_1, E_r and E_t are intensity of reflected sound, of reverberant sound, and talker's level, respectively. (Fig. 5 and Fig. 6) On the other hand, it has been confirmed that difficulty in speaking in an actual multi-purpose hall, for which the results are shown in Fig. 9, agrees with the results obtained by simulation method. It has been made clear in the previous paper, that %-disturbance can be substituted for the difficulty in speaking in the case of single echo, and it is confirmed by comparing Fig. 9 with Fig. 10. that the fact holds in actual reverberant sound field. These results are useful in designing room acoustics and public address system with particular attention to the sound field around the performer.

収録刊行物

  • 日本音響学会誌

    日本音響学会誌 26 (12), 572-580, 1970

    一般社団法人 日本音響学会

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