Abstract
It has been shown that vibrotactile stimuli elicits sound perception either on their own or by enhancing otherwise inaudible sounds. For taking advantage of this phenomenon in the design of vibrotactile displays it is important to identify its properties with respect to the level of the excitation frequency. In this work, the effect of frequency levels on the ability of humans to perceive vibrotactile stimuli as sounds at the index fingertip is investigated. Eight subjects participated in the study which included comparison of sound and vibration versus sound only signals. It is shown that as hypothesized, there is a range of frequency in which the phenomenon under study seems to be most intense with maximum occurrence at 300 Hz.