Interrupted mosaic speech revisited: Gain and loss in intelligibility by stretching

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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
  • Masashi Hashimoto
    Department of Acoustic Design, Faculty of Design, Kyushu University 2 , 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan
  • Hiroshige Takeichi
    Open Systems Information Science Team, Advanced Data Science Project (ADSP), RIKEN Information R&D and Strategy Headquarters (R-IH) 3 , RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
  • Kohei Wakamiya
    Department of Acoustic Design, Faculty of Design, Kyushu University 2 , 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan

説明

<jats:p>Our previous investigation on the effect of stretching spectrotemporally degraded and temporally interrupted speech stimuli showed remarkable intelligibility gains [Udea, Takeichi, and Wakamiya (2022). J. Acoust. Soc. Am. 152(2), 970–980]. In this previous study, however, gap durations and temporal resolution were confounded. In the current investigation, we therefore observed the intelligibility of so-called mosaic speech while dissociating the effects of interruption and temporal resolution. The intelligibility of mosaic speech (20 frequency bands and 20 ms segment duration) declined from 95% to 78% and 33% by interrupting it with 20 and 80 ms gaps. Intelligibility improved, however, to 92% and 54% (14% and 21% gains for 20 and 80 ms gaps, respectively) by stretching mosaic segments to fill silent gaps (n = 21). By contrast, the intelligibility was impoverished to a minimum of 9% (7% loss) when stretching stimuli interrupted with 160 ms gaps. Explanations based on auditory grouping, modulation unmasking, or phonemic restoration may account for the intelligibility improvement by stretching, but not for the loss. The probability summation model accounted for “U”-shaped intelligibility curves and the gain and loss of intelligibility, suggesting that perceptual unit length and speech rate may affect the intelligibility of spectrotemporally degraded speech stimuli.</jats:p>

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