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Phase effects on the masking of speech by harmonic complexes: Variations with level

Green, T; Rosen, S; (2013) Phase effects on the masking of speech by harmonic complexes: Variations with level. Journal of the Acoustical Society of America , 134 (4) 2876 - 2883. 10.1121/1.4820899. Green open access

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Abstract

Speech reception thresholds were obtained in normally hearing listeners for sentence targets masked by harmonic complexes constructed with different phase relationships. Maskers had either a constant fundamental frequency (F0), or had F0 changing over time, following a pitch contour extracted from natural speech. The median F0 of the target speech was very similar to that of the maskers. In experiment 1 differences in the masking produced by Schroeder positive and Schroeder negative phase complexes were small (around 1.5 dB) for moderate levels [60 dB sound pressure level (SPL)], but increased to around 6 dB for maskers at 80 dB SPL. Phase effects were typically around 1.5 dB larger for maskers that had naturally varying F0 contours than for maskers with constant F0. Experiment 2 showed that shaping the long-term spectrum of the maskers to match the target speech had no effect. Experiment 3 included additional phase relationships at moderate levels and found no effect of phase. Therefore, the phase relationship within harmonic complexes appears to have only minor effects on masking effectiveness, at least at moderate levels, and when targets and maskers are in the same F0 range.

Type: Article
Title: Phase effects on the masking of speech by harmonic complexes: Variations with level
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1121/1.4820899
Publisher version: http://dx.doi.org/10.1121/1.4820899
Language: English
Additional information: © 2013 Acoustical Society of America
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Speech, Hearing and Phonetic Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1415965
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