Informational masking of speech by acoustically similar intelligible and unintelligible interferers

Abstract

Masking experienced when target speech is accompanied by a single interfering voice is often primarily informational masking (IM). IM is generally greater when the interferer is intelligible than when it is not (e.g., speech from an unfamiliar language), but the relative contributions of acoustic-phonetic and linguistic interference are often difficult to assess owing to acoustic differences between interferers (e.g., different talkers). Three-formant analogues (F1+F2+F3) of natural sentences were used as targets and interferers. Targets were presented monaurally either alone or accompanied contralaterally by interferers from another sentence (F0 = 4 semitones higher); a target-to-masker ratio (TMR) between ears of 0, 6, or 12 dB was used. Interferers were either intelligible or rendered unintelligible by delaying F2 and advancing F3 by 150 ms relative to F1, a manipulation designed to minimize spectro-temporal differences between corresponding interferers. Target-sentence intelligibility (keywords correct) was 67% when presented alone, but fell considerably when an unintelligible interferer was present (49%) and significantly further when the interferer was intelligible (41%). Changes in TMR produced neither a significant main effect nor an interaction with interferer type. Interference with acoustic-phonetic processing of the target can explain much of the impact on intelligibility, but linguistic factors—particularly interferer intrusions—also make an important contribution to IM.

Publication DOI: https://doi.org/10.1121/10.0000688
Divisions: College of Health & Life Sciences > School of Psychology
Additional Information: © 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). This research was supported by Research Grant No. ES/ N014383/1 from the Economic and Social Research Council (United Kingdom), awarded to B.R.
Uncontrolled Keywords: Arts and Humanities (miscellaneous),Acoustics and Ultrasonics
Publication ISSN: 1520-8524
Last Modified: 22 Jul 2024 07:23
Date Deposited: 21 Feb 2020 15:01
Full Text Link:
Related URLs: https://asa.sci ... 1121/10.0000688 (Publisher URL)
http://research ... ston.ac.uk/459/ (Related URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2020-02-14
Accepted Date: 2020-01-19
Authors: Summers, Robert
Roberts, Brian (ORCID Profile 0000-0002-4232-9459)

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