Abstract
This paper deals with the results of sound quality study of vehicle warning signal using SD method and physiological effect of measured heartbeats at the onset of vehicle warning signal. The following five polar adjective scales were used, i.e., frightened-not frightened, pleasant-unpleasant, more warning-less warning, metallic-deep and powerful-weak for evaluations of test signal. Finally, the subjective ratings were correlated with the three psychoacoustical measures, namely, SPL (dBA), loudness (sone) and sharpness (acum) for determination of threshold values.
