| Intelligibility of bandpass speech: effects of truncation or removal of transition bands. | |
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MedLine Citation:
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PMID: 11008826 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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An intelligibility of over 90% was reported for keywords in "everyday" 1/3-octave sentences centered on 1500 Hz and having steep transition band slopes of 100 dB/octave [Warren et al., Percept. Psychophys. 57, 175-182 (1995)]. A subsequent study by Warren and Bashford [J. Acoust. Soc. Am. 106, L47-L52 (1999)] found that it was not the 1/3-octave passband, but the transition bands that were chiefly responsible for this high intelligibility: When the passband and transition bands were segregated using filter slopes of 1000 dB/octave, the isolated passband had an intelligibility score of only 24%, while the pair of transition bands had a score of over 80%. In the present study, experiment 1 examined the distribution of information along the transition bands' slopes by truncation at graded downpoints: Truncation at downpoints of 40 dB or more produced no significant change in intelligibility. Experiment 2 closed the gap separating the transition bands so that their slopes intersected at 1500 Hz. This triangular band had a negligible passband (as defined conventionally by 3-dB downpoints) and an intelligibility score of 60%; truncation at downpoints of 50 dB or more produced no significant change in intelligibility. Experiment 3 determined the intelligibilities of rectangular bands (1000-dB/octave slopes) centered on 1500 Hz. Their bandwidths ranged from 3 to 12 semitones in 1-semitone steps, resulting in intelligibility scores increasing monotonically from 14% to 94%. Calculations based upon experiments 2 and 3 showed that the triangular band truncated at 30-dB downpoints had half the intelligibility of a rectangular band having the same frequency range. |
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Authors:
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R M Warren; J A Bashford; P W Lenz |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 108 ISSN: 0001-4966 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2000 Sep |
Date Detail:
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Created Date: 2000-10-19 Completed Date: 2000-10-19 Revised Date: 2011-07-25 |
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: 1264-8 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Wisconsin-Milwaukee 53201-0413, USA. rmwarren@csd.uwm.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Humans Random Allocation Speech Perception / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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DC 00208/DC/NIDCD NIH HHS; R01 DC000208-15/DC/NIDCD NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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