Abstract
This paper describes how the evaluations of sound quality of car interior noise are affected by the visual scenery and by the seat vibration exposed simultaneously with the variations of brightness and vibration level respectively under the real running mode. Subjective experiments were conducted using the car simulator set in the sound proof room and evaluations were conducted using a ten key box as an input devise for the subjective responses with the 7 category scale. The attributes used are powerfulness, unpleasantness and booming sensation for obtaining their trade-off levels in SPL with the variations of brightness and vibration level. As a result, the evaluations of powerfulness, unpleasantness and booming sensation increase with the decrease of brightness of the visual scenery and with the increase of vibration level of the seat vibration. In general, the effect of increase in the evaluations is more with the increase of vibration level than with the decrease of brightness.
