The purpose of this study is to develop an index that evaluates the sound quality of the door latches and improves the sound quality based on the results. To conduct the jury evaluation, various operating sounds of door latches were used. Through the results of the jury evaluations, loudness and sharpness related metrics are dominant in the sound quality index we developed. This research investigates the main transfer path of operating sounds through sound field visualization and concludes what could reduce the impact sound of the door latch. Therefore, we could verify the sound quality improvement of modified products by using the sound quality index.
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