Document Detail

Masking-level difference in filtered-random and amplitude-modulated noise.
MedLine Citation:
PMID:  6738039     Owner:  NLM     Status:  MEDLINE    
The masking characteristics of filtered-random noise and amplitude-modulated noise (40-dB pressure-spectrum level) were studied in a series of four experiments using a masking-level difference paradigm, that is, 500-Hz thresholds in S0N0 and SpiN0 binaural conditions. In Experiment 1 a filtered noise (200-800 Hz) and an amplitude-modulated noise (425-575 Hz) produced equal thresholds in S0N0; for SpiN0, however, the thresholds in amplitude-modulated noise were 1.6 dB lower than were the thresholds in filtered noise. In Experiment 2 S0N0 and SpiN0 thresholds were established in three filtered noise bandwidths (200-800 Hz, 335-685 Hz, and 410-600 Hz) and in the amplitude-modulated noise (425-575 Hz). When the bandwidths of the filtered-random and amplitude-modulated noises were similar, the SpiN0 thresholds were the same but the S0N0 thresholds were different. Experiments 3 and 4 indicated that with amplitude-modulated noise when the zero amplitude crossings of the tone and the noise coincided, the S0N0, SpiN0, and SmNm thresholds were 1.2-2.0 dB higher than were the thresholds when the zero crossings of the tone and noise did not coincide. The data indicate that the masking characteristics of filtered-random noise and amplitude-modulated noise are different. The findings are interpreted as an indication that perceptual phenomena depend on the temporal characteristics as well as the power spectrum of the signal and masker.
R H Wilson; J T Arcos; C J Brown; L A Bennett
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of speech and hearing research     Volume:  27     ISSN:  0022-4685     ISO Abbreviation:  J Speech Hear Res     Publication Date:  1984 Jun 
Date Detail:
Created Date:  1984-08-22     Completed Date:  1984-08-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376336     Medline TA:  J Speech Hear Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  267-74     Citation Subset:  IM    
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MeSH Terms
Audiometry, Pure-Tone
Auditory Threshold*
Loudness Perception
Perceptual Masking*
Pitch Perception*

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

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