| Relative contribution to speech intelligibility of different envelope modulation rates within the speech dynamic range. | |
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MedLine Citation:
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PMID: 20968383 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The contribution of envelope cues at different rates to intelligibility in a competing-speech task was measured as a function of the short-term envelope level. The target and background mixture was processed using tone vocoders. Envelope signals for each vocoder channel were simultaneously extracted with two low-pass filters, the cutoff frequency of one filter (L) being two octaves below that of the other (H). The envelope from the H filter was used at the peaks and that from the L filter at valleys, or vice versa. This was achieved by cross-fading between the two envelope signals based on a "switching threshold" that was parametrically varied relative to the long-term RMS level of the channel signal. When the cutoff frequencies of the H and L filters were 50 and 12.5 Hz, changes in speech intelligibility occurred mainly when the switching threshold was between -18 and +10 dB. The range was slightly narrower when the cutoff frequencies of the H and L filters were 200 and 50 Hz. Intensity-importance functions for higher-rate envelope modulations suggested that levels ranging from 20 dB below to about 10 dB above the channel RMS level were important, with maximum importance for levels around -5 dB. |
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Authors:
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Michael A Stone; Christian Füllgrabe; Brian C J Moore |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 128 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-10-25 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: 2127-37 Citation Subset: IM |
Affiliation:
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Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, England. mas19@cam.ac.uk |
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Descriptor/Qualifier:
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| Grant Support | |
ID/Acronym/Agency:
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G0701870//Medical Research Council |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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