Abstract
Subjective ratings of pure tones at low and infrasonic (3–40 Hz) were obtained on a set of semantic-differential-type scales and were analysed by factor analysis.
From the results, it was concluded that there are three main factors in the human response to the stimulus sound, these are 1) sound pressure, 2) vibration, and 3) loudness. In order to predict the human responses from the physical variables of the sound stimuli, prediction equations were derived for each of the three factors. Also, equal sensation contours for the factors were obtained. From these results, a new evaluation method for the psychological effects is proposed, which considers the multidimensional aspects of human perception at loww and infrasonic frequencies.
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