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The interior noise produced in a car while accelerating was studied from the aspect of sound quality. The quality of interior noise produced in various types of cars was first assessed subjectively by Semantic Differential method. These data were then compared with the data obtained by objective assessment. Two types of cars having two types of sound quality were then produced by making necessary modifications on the basis of the comparison. The new information gained on sound improving technology which is very effective in setting up pleasant sound environment, has been discussed in this paper.