Document Detail

Signal properties that reduce masking by simultaneous, random-frequency maskers.
MedLine Citation:
PMID:  7593915     Owner:  NLM     Status:  MEDLINE    
Large amounts of simultaneous masking can be produced by changing the frequency content of multicomponent maskers with each presentation. Much of this masking appears to be informational, that is, produced by stimulus uncertainty. This study examined whether relatively simple changes in the properties or presentation mode of the signal could increase the saliency of the signal and reduce this masking. The number of masker components varied from 2 to 100 across conditions. The reference signal was a 200-ms, 1000-Hz sinusoid, presented monaurally with the masker. Across experiments, changes in masking relative to the reference condition were examined for different signal types (amplitude-modulated, quasifrequency-modulated, or narrow-band noise), durations (100 or 10 ms), and presentation modes (diotic, dichotic, or cross ear). The use of AM and NBN signals improved performance more consistently than the QFM signal, which degraded performance for some listeners. Lower masking in the reference condition for these listeners may have limited the effects of signal type. Dichotic (versus monaural) presentation produced larger reductions in masking for more listeners and conditions. Comparisons to results with broadband maskers and other patterns in the data, however, suggest the dichotic advantage may not clearly reflect a reduction of masking due to uncertainty. Separating masker and signal onset/offset times by shortening signal duration produced the largest and most consistent reductions in masking produced by masker-frequency uncertainty.
D L Neff
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  98     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  1995 Oct 
Date Detail:
Created Date:  1995-12-01     Completed Date:  1995-12-01     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1909-20     Citation Subset:  IM    
Boys Town National Research Hospital, Omaha, Nebraska 68131, USA.
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MeSH Terms
Auditory Perception
Auditory Threshold
Dichotic Listening Tests
Perceptual Masking*
Time Factors
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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