Archives of Acoustics, 23, 4, pp. 491-498, 1998

Tuning in the amplitude modulation rate domain

A. P. Sęk
Institute of Acoustics, Adam Mickiewicz University, 60-769 Poznań, Matejki 48/49, Poland
Poland

E. B. Skrodzka
Institute of Acoustics, Adam Mickiewicz University, 60-769 Poznań, Matejki 48/49, Poland
Poland

This paper is concerned with a certain form of masking that seems to exist in the modulation rate domain. It was shown that clearly audible changes in the amplitude of a 4kHz sinusoidal carrier signal produced by a sinusoidal "probe" modulator were inaudible (masked) in the presence of amplitude changes in the same carrier produced by a "masking" modulator which was a 10Hz wide band of white noise. This type of masking was most effective when the centre rate of the masking modulator was close or equal to the modulation rate of the probe modulator. The pattern of results showed a tuning effect in the modulation rate domain. These findings are generally consistent with the concept of a second stage of the filtering that may take place in the auditory system.
Full Text: PDF


Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN)