Masking-Level Difference in Filtered-Random and Amplitude-Modulated Noise 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 SoNo and SπNo binaural conditions. In Experiment 1 a filtered noise (200–800 Hz) and an amplitude-modulated noise (425–575 Hz) produced ... Research Article
Research Article  |   June 01, 1984
Masking-Level Difference in Filtered-Random and Amplitude-Modulated Noise
 
Author Affiliations & Notes
  • Richard H. Wilson
    Va Medical Center, Long Beach, California and University of California, Irvine
  • John T. Argos
    Va Medical Center, Long Beach, California and University of California, Irvine
  • Carolyn J. Brown
    Va Medical Center, Long Beach, California and University of California, Irvine
  • Leslie A. Bennett
    Va Medical Center, Long Beach, California and University of California, Irvine
Article Information
Research Articles
Research Article   |   June 01, 1984
Masking-Level Difference in Filtered-Random and Amplitude-Modulated Noise
Journal of Speech, Language, and Hearing Research, June 1984, Vol. 27, 267-274. doi:10.1044/jshr.2702.267
History: Received March 14, 1983 , Accepted November 7, 1983
 
Journal of Speech, Language, and Hearing Research, June 1984, Vol. 27, 267-274. doi:10.1044/jshr.2702.267
History: Received March 14, 1983; Accepted November 7, 1983

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 SoNo and SπNo binaural conditions. In Experiment 1 a filtered noise (200–800 Hz) and an amplitude-modulated noise (425–575 Hz) produced equal thresholds in SoNo; for SπNo, however, the thresholds in amplitude-modulated noise were 1.6 dB lower than were the thresholds in filtered noise. In Experiment 2 SoNo and SπN0 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 filteredrandom and amplitude-modulated noises were similar, the SπNo thresholds were the same but the SoNo thresholds were different. Experiments 3 and 4 indicated that with amplitude-modulated noise when the zero amplitude crossings of the tone and the noisecoincided, the SoNo, SπNo, 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 amplitudemodulated noise are different. The findings are interpreted as an indication that perceptual phenomena depend on the temporal characteristies as well as the power spectrum of the signal and masker.

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