Effects on Perception when Removing One Frequency Component from Two Harmonic Vibrations

Textures with two-peak vibration spectral profiles complicate the digital filters necessary to reproduce their specificities. This also cascades into the complexity of texture reproduction models, which many researchers were interested in simplifying. Thus, our work focused on the simplification of vibration spectral profiles. For this purpose, we needed knowledge of what vibration spectral profiles (with two peaks) could be reproduced using only one of the peaks without affecting the texture perception. First, our main objective was to find whether the higher or lower frequency should be removed because it hadn’t been investigated in other works. The similarity of vibrations, before and after the suppression of one peak, decreased if the lower frequency waves were removed but not if it was the higher frequency waves that were removed. Then, we studied the influence on similarity reduction by varying the frequency and amplitude of these waves. The frequency had the greatest influence among the tested parameters, while the amplitude ratio between the lower and higher frequency waves also had some moderate influence. Lastly, we found that texture perception is not affected by removing the smaller peak if the frequencies of the two peaks are close and the amplitude ratio is large enough.