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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/14743

Title: Acoustical analyses of Lombard speech by different background noise levels for tendencies of intelligibility
Authors: Ngo, Thuan Van
Kubo, Rieko
Morikawa, Daisuke
Akagi, Masato
Issue Date: 2017-03-02
Publisher: Research Institute of Signal Processing, Japan
Magazine name: 2017 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'17)
Start page: 309
End page: 312
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 Research Institute of Signal Processing, Japan. Thuan Van Ngo, Rieko Kubo, Daisuke Morikawa, Masato Akagi, 2017 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'17), 2017, 309-312.
URI: http://hdl.handle.net/10119/14743
Material Type: publisher
Appears in Collections:b11-1. 会議発表論文・発表資料 (Conference Papers)

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