| Channel segregation improves perception of speech with temporally desynchronized bands. | |
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MedLine Citation:
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PMID: 19063000 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Stilp et al. [J. Acoust. Soc. Am. 122, 2971 (2007)] investigated the intelligibility of temporally desynchronized bands of speech and concluded that listeners's resilience to temporal asynchrony may possibly be due to differences in fundamental frequency (f(0)) across syllables which may help in segregating bands. This hypothesis is tested in two experiments in temporally desynchronized bands but with spectral manipulations designed to either aid or inhibit stream segregation. Seven-syllable sentences were synthesized at three different speaking rates and processed by four nonoverlapping 13-octave filters. Onsets of the lowest- and highest-frequency bands were parametrically delayed. In Experiment 1, f(0) in delayed bands was uniformly elevated using pitch-synchronous overlap add synthesis. In the control condition (no f(0) manipulation), intelligibility was nonmonotonic with delay across speaking rates with local minima corresponding to the duration of one syllable. The two-speaker manipulation decreased spectral similarity across bands making intelligibility more resilient to temporal distortion. In Experiment 2, f(0) contours were flattened. Intelligibility was uniformly poorer than in the control condition; the increased spectral similarity compromised listeners' ability to segregate information from band pairs at various delays. Acoustic measures of potential information, absent explicit linguistic information, reinforce the strong relationship between spectral predictability and intelligibility. Overall, results provide support that channel segregation plays an important role in the perception of temporally desynchronized bands. [Supported by NIDCD]. |
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Authors:
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Michael Kiefte; Christian E Stilp; Keith R Kluender |
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: 124 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2008 Oct |
Date Detail:
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Created Date: 2008-12-09 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: 2457 Citation Subset: IM |
Affiliation:
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School of Human Commun. Disord., Dalhousie Univ., Halifax, NS B3H 1R2, Canada, mkiefte@dal.ca Univ. of Wisconsin, Madison, WI 53706. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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