Influence of Signal Duration on the Masking-Level Difference The effect of signal duration on the 500-Hz masking-level difference was studied in 4 subjects using an adaptive, two-interval, forced-choice method. SoNo, SπNo, and SoNπ thresholds for 13 signal durations between 2 and 100 ms were established incontinuous broadband noise (36.2 dB pressure-spectrum level). The signals were synthesized and gated ... Research Article
Research Article  |   September 01, 1987
Influence of Signal Duration on the Masking-Level Difference
 
Author Affiliations & Notes
  • Richard H. Wilson
    Veterans Administration Medical Center, Long Beach, and University of California, Irvine
  • Ruth A. Fugleberg
    Veterans Administration Medical Center, Long Beach, and University of California, Irvine
Article Information
Research Articles
Research Article   |   September 01, 1987
Influence of Signal Duration on the Masking-Level Difference
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 330-334. doi:10.1044/jshr.3003.330
History: Received October 8, 1986 , Accepted February 5, 1987
 
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 330-334. doi:10.1044/jshr.3003.330
History: Received October 8, 1986; Accepted February 5, 1987

The effect of signal duration on the 500-Hz masking-level difference was studied in 4 subjects using an adaptive, two-interval, forced-choice method. SoNo, SπNo, and SoNπ thresholds for 13 signal durations between 2 and 100 ms were established incontinuous broadband noise (36.2 dB pressure-spectrum level). The signals were synthesized and gated digitally with 1-ms rise-fall times. The SoNo threshold integration functions diverged from the SπNo or the SoNπ threshold integration functions as the signal duration was reduced from 100 ms to 6–10 ms. As the signal duration was reduced below 6–10 ms, however, the threshold integration functions for SoNo, SπNo, and SoNπ converged. The relationships among the threshold integration functions were reflected in the SoNo-SπNo and the SoNo-SoNπ masking-level differences that increased as the signal duration was reduced from 100 to 6–10 ms and then decreased as the signal duration was reduced below 6–10 ms.

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