Abstract
In this paper, we precisely investigate a method for giving a tactile sensation with a combination of imperceptible vibrations. When the two frequencies such as 1.2 and 1.3 kHz (both of them are beyond the perceivable range) are applied to skin surface, we feel vibration. This characteristic has been mainly considered due to the effect of non-linear skin elastic property, however, we observed that the skin surface only moves at the input frequencies (1.2, 1.3 kHz) but it does not move at modulated frequency (50 Hz). We also found another remarkable characteristic that a harmonic frequencies pair, such as 1.2 and 2.4 kHz, lessened sensitivity. When we assume that the mechanoreceptor detects low frequency envelope of a given signal, the perceptual characteristics are well explained.
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