| Comodulation masking release in consonant recognition. | |
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MedLine Citation:
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PMID: 12186043 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Comodulation masking release (CMR) refers to an improvement in the detection threshold of a signal masked by noise with coherent amplitude fluctuation across frequency, as compared to noise without the envelope coherence. The present study tested whether such an advantage for signal detection would facilitate the identification of speech phonemes. Consonant identification of bandpass speech was measured under the following three masker conditions: (1) a single band of noise in the speech band ("on-frequency" masker); (2) two bands of noise, one in the on-frequency band and the other in the "flanking band," with coherence of temporal envelope fluctuation between the two bands (comodulation); and (3) two bands of noise (on-frequency band and flanking band), without the coherence of the envelopes (noncomodulation). A pilot experiment with a small number of consonant tokens was followed by the main experiment with 12 consonants and the following masking conditions: three frequency locations of the flanking band and two masker levels. Results showed that in all conditions, the comodulation condition provided higher identification scores than the noncomodulation condition, and the difference in score was 3.5% on average. No significant difference was observed between the on-frequency only condition and the comodulation condition, i.e., an "unmasking" effect by the addition of a comodulated flaking band was not observed. The positive effect of CMR on consonant recognition found in the present study endorses a "cued-listening" theory, rather than an envelope correlation theory, as a basis of CMR in a suprathreshold task. |
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Authors:
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Bom Jun Kwon |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; 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: 112 ISSN: 0001-4966 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2002 Aug |
Date Detail:
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Created Date: 2002-08-20 Completed Date: 2002-10-17 Revised Date: 2007-11-14 |
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: 634-41 Citation Subset: IM |
Affiliation:
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Department of Auditory Implants and Perception, House Ear Institute, Los Angeles, California 90057-1922, USA. bkwon@cochlear.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Attention* Auditory Threshold Humans Perceptual Masking* Phonetics* Pitch Perception Sound Spectrography Speech Acoustics Speech Perception* |
| Grant Support | |
ID/Acronym/Agency:
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R01-01526//PHS HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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