発声機能におよぼす反射音の影響について

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It is well-knowm that reflection sounds of large transit time and high level disturb the audience to listen speech or music. Also, the effect of interference of such reflection sounds given to the speaker cannot be disregarded in our experience. Several studies are performed in this paper about the influence of a single echo given to the speaker, and the following facts are clarified. Tentative criteria for the difficulty in speaking agree with %-disturbance under the conditions that it is in the case of speech, the transit time of single echo is between 50 to 200 msec and the probability of judgment is below 50% (Fig. 3). It can be explained that the effect takes place because the hearing function and the speaking function are formed as a feedback loop in brain and the automatic control action is worked through the feedback loop in the judgment of difficulty in speaking. In other words, the speaker judges "hearing disturbance" in place of "difficulty in speaking" by controling his talker's level and speaking speed. When higher of lower frequency conponents of a single echo are damped down, the criteria for the difficulty in speaking change as shown in Fig. 5, 6, 9 and 10. These problems are illustrated by the collective consideration of temporal masking, remote masking and spectrum distribution of speech. Incidence angle of a single echo to the speaker has no influence on the judgment of difficulty in speaking, excepting for the reflection sound of opposite incidence and small transit time (Fig. 12 and Fig. 13).
社団法人日本音響学会の論文
1970-10-10

発声機能におよぼす反射音の影響について

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