Abstract
Acoustic roughness was proposed as a psychoacoustic metric, indicating that rough sound would attract attention or cause unpleasant feelings. Noting that some previous studies have found a negative relation between roughness and discomfort caused by noise, we intend to investigate the effect of roughness on discomfort. The 1000Hz tone was amplitude modulated with the modulation frequency range of 10-140Hz and a modulation depth of 100% as the test stimuli. Forty-eight subjects rated the discomfort caused by the test stimuli relative to the reference stimulus having a standard 1 asper roughness (i.e., 1000Hz tone with a modulation frequency of 70 Hz and a modulation depth of 100%) using the method of relative magnitude estimation. Each stimulus had a sound pressure level of 60 dB and a duration of 1 second. We identified a nonlinear pattern of discomfort with the increasing modulation frequency, with the lowest discomfort for the standard 1 asper roughness at a modulation frequency of 70 Hz. A modification weighting dependent on the modulation frequency would better quantify the roughness metric to reflect the effect of rough sound on discomfort.
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