The spatial unmasking of speech: Evidence for within-channel processing of interaural time delay

Edmonds, Barrie Alan and Culling, John Francis ORCID: https://orcid.org/0000-0003-1107-9802 2005. The spatial unmasking of speech: Evidence for within-channel processing of interaural time delay. Journal of the Acoustical Society of America 117 (5) , pp. 3069-3078. 10.1121/1.1880752

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Abstract

Across-frequency processing by common interaural time delay (ITD) in spatial unmasking was investigated by measuring speech reception thresholds (SRTs) for high- and low-frequency bands of target speech presented against concurrent speech or a noise masker. Experiment 1 indicated that presenting one of these target bands with an ITD of +500 μs and the other with zero ITD (like the masker) provided some release from masking, but full binaural advantage was only measured when both target bands were given an ITD of +500 μs. Experiment 2 showed that full binaural advantage could also be achieved when the high- and low-frequency bands were presented with ITDs of equal but opposite magnitude (±500 μs). In experiment 3, the masker was also split into high- and low-frequency bands with ITDs of equal but opposite magnitude (±500 μs). The ITD of the low-frequency target band matched that of the high-frequency masking band and vice versa. SRTs indicated that, as long as the target and masker differed in ITD within each frequency band, full binaural advantage could be achieved. These results suggest that the mechanism underlying spatial unmasking exploits differences in ITD independently within each frequency channel.

Item Type:	Article
Status:	Published
Schools:	Psychology
Uncontrolled Keywords:	hearing; speech processing
Publisher:	Acoustical Society of America
ISSN:	0001-4966
Date of First Compliant Deposit:	30 March 2016
Last Modified:	11 Oct 2023 22:09
URI:	https://orca.cardiff.ac.uk/id/eprint/13742

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