多重音声の統計的性質と通話妨害について

概要

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This paper describes about some characteristics of voice babble statistically from the viewpoint of the number of extraneous talkers. The probability distribution function proposed by Davenport was extended to W_n(x) where there are n simultaneous talkers each creating the same conversational speech level, and x is the speech amplitude normalized to have an rms value to unity. In case of n being larger than 4, W_n(x) was estimated on the basis of bilateral exponential distribution. Each estimated value provides a good apporoximation to measured one. Level distributions of overlapped speech were also measured after normalizing the value of equivalent noise level L_<eq>. The reception of monosyllabic words presented to a single ear with a voice babble was compared. These results indicate that either interfering talker or interfering speech level increases, the percentage articulation decreases. Another intelligibility measurement against artificially fluctuated complex tone agrees with the one by voice babble, so it can be concluded that the voice babble exhibits a tendency like an overlapped vowels.
社団法人日本音響学会の論文
1979-01-01