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Speech intelligibility among modulated and spatially distributed noise sources

Culling, John Francis ORCID: and Mansell, Elizabeth R. 2013. Speech intelligibility among modulated and spatially distributed noise sources. Journal of the Acoustical Society of America 133 (4) , pp. 2254-2261. 10.1121/1.4794384

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At a cocktail party, listeners are faced with multiple, spatially distributed interfering voices. The dominant interfering voice may change from moment to moment and, consequently, change in spatial location. The ability of the binaural system to deal with such a dynamic scene has not been systematically analyzed. Spatial release from masking (SRM) was measured in simple spatial scenes, simulated over headphones with a frontal speech source. For a single noise at 105°, , SRM was reduced if that noise modulated (10 Hz square wave, 50% duty cycle, 20 dB modulation depth), but, for two noises in symmetrical locations, SRM increased if the noises were modulated in alternation, suggesting that the binaural system can “switch” between exploiting different spatial configurations. Experiment 2 assessed the contributions of interaural time and level differences as a function of modulation rate (1–20 Hz). Scenes were created using the original head-related impulse responses and ones that had been manipulated to isolate each cue. SRM decreased steeply with modulation rate. The combined effects of interaural time and level differences were consistent with additive contributions. The results indicate that binaural sluggishness limits the contribution of binaural switching to speech understanding at a cocktail party

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: B Philosophy. Psychology. Religion > BF Psychology
P Language and Literature > P Philology. Linguistics
Publisher: Acoustical Society of America
ISSN: 0001-4966
Date of First Compliant Deposit: 30 March 2016
Last Modified: 13 May 2023 11:03

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