| The perceptual organization of noise-vocoded speech under competitive conditions. | |
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MedLine Citation:
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PMID: 20330728 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Research using sine-wave speech suggests that across-formant grouping depends critically on modulation of the frequency but not the amplitude contours of the formants. The generality of this finding was explored using noise-vocoded sentences. Sentences were filtered into six frequency bands, and the amplitude envelope of each band was used to modulate a matched noise-band carrier (N). Bands were paired, corresponding to F1 (=N1+N2), F2 (=N3+N4), and the higher formants (F3(')=N5+N6), so that the frequency contour of a formant was implied by variation in the relative amplitudes of the corresponding pair of bands. Perceptual organization was probed by presenting stimuli dichotically (F1+F2C; F2+F3(')), where F2C is a competitor for F2 that listeners must resist to optimize intelligibility. F2Cs were derived from F2 by time reversing the envelopes of N3+N4. Implied frequency variation in F2C was manipulated by varying the AM depth in the constituent bands (100%-0% of original depth) or by comodulating both bands with the same envelope (from N3, N4, or N3+N4). Competitor efficacy declined with AM depth. Comodulated competitors were less efficacious than their 100% modulated counterpart. The findings are consistent with the proposal that it is the time-varying frequency contours of formants that govern their grouping. [Work supported by EPSRC.]. |
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Authors:
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Brian Roberts; Robert J Summers; Peter J Bailey |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 127 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 1904 Citation Subset: IM |
Affiliation:
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Psych., Sch. of Life and Health Sci., Aston Univ., Birmingham B4 7ET, United KingdomUniv. of York, Heslington, York YO10 5DD, United Kingdom. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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