変動騒音下における連続音声の了解性の評定

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This study concerns subjective ratings of speech-intelligibility with method of magnitude estimation. Rating tests were conducted for speech sound in level-fluctuating noises with four σ (standard deviation of noise level distribution)and steady noises of controls. Relations of subjective ratings(or PSE)among level-fluctuating noises and steady noise were investigated in relation to SNR(signal-to-noise ratio). Further, an equivalent level of level-fluctuating noises to steady noise was estimated for subjective ratings of speech-intelligibility by multiple regression analysis. As the results, subjective ratings in level-fluctuating noises correlated to SNR in higher than 0. 92 and the standard errors of subjective ratings(in PSE)were 1. 5-3. 4 dB around each regression line. Accuracy of these was equivalent to that in steady noise. Further, it was showed that L_<eq> had a tendancy to be overestimated as to subjective ratings of speech-intelligibility especially in the lower levels of L_<eq> at the larger σ of level-fluctating noises. As the equivalent level to steady noise, it was estimated that L_y=L_<eq>-SNR(0. 05σ-0. 003σ^2 for subjective ratings. It was showed that articulation index(estimated)would be available to estimate subjective ratings in stead of L_y. It was also showed that the equivalent level of L_s by Sone et al. for sound articulation would be useful to estimate subjective ratings instead of L_y. But some differences were observed between L_y and L_s and it was suggested that the definition of L_s should follow L_s=L_<eq>-0. 059σ^2 as far as distribution of noise levels would not follow normal distribution
社団法人日本音響学会の論文
1985-07-01

変動騒音下における連続音声の了解性の評定

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