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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/14712

Title: Acoustical Analyses of Tendencies of Intelligibility in Lombard Speech with Different Background Noise Levels
Authors: Ngo, Thuan Van
Kubo, Rieko
Morikawa, Daisuke
Akagi, Masato
Issue Date: 2017
Publisher: 信号処理学会
Magazine name: Journal of Signal Processing
Volume: 21
Number: 4
Start page: 171
End page: 174
DOI: 10.2299/jsp.21.171
Abstract: This study investigates acoustic variations when producing Lombard speech under the effect of a changing environment to identify adaptive tendencies of intelligibility. Analyses of the acoustic features of duration, F0, formants, spectral tilts and modulation spectrum in a dataset of speech at noise levels of - ∞, 66, 72, 78, 84, and 90 dB were carried out. The results show that the recognized tendencies (neutral-Lombard distinction), including lengthening vowel duration, increasing F0, shifting F1 and decreasing spectral tilts (A1-A3) are preserved among Lombard speech produced in backgrounds with a various noise levels. Our new findings are an abrupt change in F0 at 84 dB, increasing formant amplitudes, and H1-H2 variation, and a raised modulation spectrum. On the basis of physiological and psychological knowledge, we can give reasons for their correlations with intelligibility. Moreover, these variations continuously vary with increasing noise level. As a result, it is suggested that they are related to the adaptive tendencies of intelligibility.
Rights: Copyright (C) 2017 信号処理学会. Thuan Van Ngo, Rieko Kubo, Daisuke Morikawa, Masato Akagi, Journal of Signal Processing, 21(4), 2017, 171-174. http://dx.doi.org/10.2299/jsp.21.171
URI: http://hdl.handle.net/10119/14712
Material Type: publisher
Appears in Collections:b10-1. 雑誌掲載論文 (Journal Articles)

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