Abstract
This paper deals with the evaluation of thickness sensed by tapping the walls, doors or furniture with knuckles. Sensory test was conducted with 36 model walls and 50 subjects. The subjects appraised the thickness sensed by tapping on the model walls with knuckles by means of the category method. The tapping sound when the rubber ball of 14 grams in weight collided against the model walls was measured with a Impulse Precision Level Meter and 1/3 Octave Band Analyzer. Results of tests, the model walls made of thick surface material have small sound level and high frequency, and the walls made of thin surface material have large sound lavel and low frequency. The thickness sensed by tapping sound can be estimated by the sound level and frequency of the sound.
