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Hearing sensitivity to gliding rippled spectrum patterns.
Journal of the Acoustical Society of America 2018 April
The sensitivity of human hearing to gliding rippled spectrum patterns of sound was investigated. The test signal was 2-oct wide rippled noise with the ripples gliding along the frequency scale. Both ripple density and gliding velocity were frequency-proportional across the signal band; i.e., the density was specified in ripples/oct and the velocity was specified in oct/s and ripple/s. The listener was required to discriminate between a test signal with gliding ripples and a non-rippled reference signal. Limits of gliding velocity were measured as a function of ripple density. The ripple gliding velocity limit decreased with an increasing ripple density: from 388.9 oct/s (388.9 ripple/s) at a ripple density of 1 ripple/oct to 11.3 oct/s (79.1 ripple/s) at a density of 7 ripple/oct. These tendencies could be approximated by log/log regression functions with slopes of 1.71 for the velocity expressed in oct/s and 0.71 for the velocity expressed in ripple/s. A qualitative model based on combined action of the excitation-pattern and the temporal-processing mechanism is suggested to explain the results.
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