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Amplitude modulation perception for people with normal hearing

2002; Acoustical Society of America; Volume: 111; Issue: 5_Supplement Linguagem: Inglês

10.1121/1.4778550

1520-9024

Jan Pieter R. Koopman, Niels Plasmans, Wouter A. Dreschler,

Speech and Audio Processing

Our experiments focus on the perception of amplitude modulation. In total, four experiments were carried out. In the first experiment, the sensitivity for amplitude modulation was determined. In the other three tests, amplitude modulation has been matched for signals that differ with respect to one of the following parameters: bandwidth, center frequency, and sensation level. The equally perceived modulation depth (EPMD) was approximately equal to the reference depth for signals with a 15 dB difference in sensation level. For the bandwidth and center frequency, we generally found an interference of the internal fluctuations on the perceived modulation depth. Data can be described reasonably well by determining the differences in sensation depth (i.e., the amplitude modulation depth [in dB] above the threshold for modulation detection). An alternative way to model the results of this study is to determine the standard deviation of energy values for a sliding temporal integrator. Both models can be improved significantly by taking into account the differences in growth of loudness functions for the two conditions.