Perceptual Discrimination of High Frequency Vibrations about Measurement-based Tactile Texture

Abstract

Vibration discrimination studies of high frequency in modulated waves have shown that the 125 Hz envelope is not perceivable when humans are presented with a 125 Hz envelope and a 300 Hz or 400 Hz carrier wave. However, the spectrum with two peaks obtained by measuring the actual texture has a smaller peak at higher frequencies. So, the frequency response is not like a modulated wave, and the effect of cutting off the high frequency wave is not known. Therefore, we studied the effect of cutting off high frequency waves in order to reduce the number of peaks to be reproduced in the measurement base. First, we prepared a composite waveform consisting of two sinusoidal waves with different amplitudes and frequencies. Then, subjects evaluated the similarity of vibrations after and before cutting off a high frequency wave by the Visual analog scale. As a result, we found that differences in frequency have a strong influence.