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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/18020

Title: Effect of articulatory and acoustic features on the intelligibility of speech in noise: an articulatory synthesis study
Authors: Ngo, Thuanvan
Akagi, Masato
Birkholz, Peter
Keywords: Lombard speech
Speech intelligibility
Articulatory study
Issue Date: 2020-01-22
Publisher: Elsevier
Magazine name: Speech Communication
Volume: 117
Start page: 13
End page: 20
DOI: 10.1016/j.specom.2020.01.004
Abstract: In noisy conditions, speakers involuntarily change their manner of speaking to enhance the intelligibility of their voices. The increased intelligibility of this so-called Lombard speech is enabled by the change of multiple articulatory and acoustic features. While the major features of Lombard speech are well known from previous studies, little is known about their relative contributions to the intelligibility of speech in noise. This study used an analysis-by-synthesis strategy to explore the contributions of multiple of these features. To this end, an articulatory speech synthesizer was used to synthesize the ten German digit words “Null” to “Neun”, for all 16 combinations of four binary features, i.e., modal vs. pressed phonation, normal vs. increased F_1 and F_2 formant frequencies, normal vs. increased f_0 mean and range, and normal vs. increased duration of vowels. Subjects were asked to try to recognize the synthesized words in the presence of strong pink noise and babble noise. Compared to “plain” speech, the word recognition rate was most improved by pressed phonation, followed by an increased f_0 mean and f_0 range, and increased formant frequencies. Increased duration of vowels slightly reduced the recognition rate for pink noise but had no effect for babble noise.
Rights: Copyright (C)2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license (CC BY-NC-ND 4.0). [http://creativecommons.org/licenses/by-nc-nd/4.0/] NOTICE: This is the author’s version of a work accepted for publication by Elsevier. Changes resulting from the publishing process, including peer review, editing, corrections, structural formatting and other quality control mechanisms, may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Thuanvan Ngo, Masato Akagi, and Peter Birkholz, Speech Communication, 117, 2020, 13-20, http://dx.doi.org/10.1016/j.specom.2020.01.004
URI: http://hdl.handle.net/10119/18020
Material Type: author
Appears in Collections:b10-1. 雑誌掲載論文 (Journal Articles)

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