| 摘要 |
<P>PROBLEM TO BE SOLVED: To contribute to the improvement of use environment by reducing discomfort sound coming from an image forming apparatus. <P>SOLUTION: The discomfort index of sound is obtained by an expression using the loudness value, the sharpness value, the tonality value and the impulsiveness value of psychoacoustic parameters obtained from sounds at a position away from the end face of the image forming apparatus by 1m, and is decreased by reducing the high-frequency component, the electrification sound and the metallic impulsive sound of the image forming apparatus. <P>COPYRIGHT: (C)2004,JPO |
