Checkerboard and interrupted speech: Intelligibility contrasts related to factor-analysis-based frequency bands
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- Kazuo Ueda
- Department of Acoustic Design, Faculty of Design/Research Center for Applied Perceptual Science/Research and Development Center for Five-Sense Devices, Kyushu University 1 , 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan
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- Linh Le Dieu Doan
- Human Science Course, Graduate School of Design, Kyushu University 2 , 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan
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- Hiroshige Takeichi
- Open Systems Information Science Team, Advanced Data Science Project (ADSP), RIKEN Information R&D and Strategy Headquarters (R-IH), RIKEN 3 , 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
説明
<jats:p>It has been shown that the intelligibility of checkerboard speech stimuli, in which speech signals were periodically interrupted in time and frequency, drastically varied according to the combination of the number of frequency bands (2–20) and segment duration (20–320 ms). However, the effects of the number of frequency bands between 4 and 20 and the frequency division parameters on intelligibility have been largely unknown. Here, we show that speech intelligibility was lowest in four-band checkerboard speech stimuli, except for the 320-ms segment duration. Then, temporally interrupted speech stimuli and eight-band checkerboard speech stimuli came in this order (N = 19 and 20). At the same time, U-shaped intelligibility curves were observed for four-band and possibly eight-band checkerboard speech stimuli. Furthermore, different parameters of frequency division resulted in small but significant intelligibility differences at the 160- and 320-ms segment duration in four-band checkerboard speech stimuli. These results suggest that factor-analysis-based four frequency bands, representing groups of critical bands correlating with each other in speech power fluctuations, work as speech cue channels essential for speech perception. Moreover, a probability summation model for perceptual units, consisting of a sub-unit process and a supra-unit process that receives outputs of the speech cue channels, may account for the U-shaped intelligibility curves.</jats:p>
収録刊行物
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- The Journal of the Acoustical Society of America
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The Journal of the Acoustical Society of America 154 (4), 2010-2020, 2023-10-01
Acoustical Society of America (ASA)
