Image formation apparatus and tone quality improving method of image formation apparatus
AssigneeRicoh Company, Ltd.
InventorsKoichi Tsunoda, Motohisa Hirono
Life of this patent
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Abstract
A discomfort index of sound is obtained by an equation using the loudness value, sharpness value, tonality value and impulsiveness value of psychoacoustic parameters obtained from sounds at a position away from the end face of an image formation apparatus by 1m. The discomfort index is decreased by reducing the high frequency component, charging noise, metallic impulsive sound and the like of the image formation apparatus, to thereby contribute to the improvement of the use environment.
Claims98
An image formation apparatus in which the discomfort index S of the sound obtained by the following tone quality evaluation equation (a) expressed in a regression equation, using regression coefficients of loudness value, sharpness value, tonality value and impulsiveness value of psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance:
- S=A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+E0.209≦A≦0.2490.308≦B≦0.4393.669≦C≦4.9840.994≦D≦1.461−4.280≦E≦−3.274 (a)
- satisfies the condition of:
- S≦0.6708×Ln (ppm)−2.82416≦ppm≦70 (b).
An image formation apparatus in which the discomfort index S of sound obtained by the following tone quality evaluation equation (c) expressed in a regression equation, using regression coefficients of loudness value, sharpness value, tonality value and impulsiveness value of psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance:
- S=A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+EA=+0.229B=+0.373C=+4.327D=+1.202E=−3.767 (c)
- satisfies the condition of:
- S≦0.6708×Ln (ppm)−2.82416≦ppm≦70 (b).
An image formation apparatus in which, of the loudness value, the sharpness value, the tonality value, the impulsiveness value and the roughness value of the psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance, the roughness value satisfies the condition of not larger than 2.20 (asper), and the discomfort index S of the sound obtained by the following tone quality evaluation equation (a) expressed in the regression equation, using the regression coefficients of loudness value, sharpness value, tonality value and impulsiveness value:
- S=A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+E0.209≦A≦0.2490.308≦B≦0.4393.669≦C≦4.9840.994≦D≦1.461−4.280≦E≦−3.274 (a)
- satisfies the condition of:
- S≦0.6708×Ln (ppm)−2.82416≦ppm≦70 (b).
An image formation apparatus in which, of the loudness value, the sharpness value, the tonality value, the impulsiveness value and the roughness value of the psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance, the roughness value satisfies the condition of not larger than 2.20 (asper), and the discomfort index S of sound obtained by the following tone quality evaluation equation (c) expressed in a regression equation, using the regression coefficients of loudness value, sharpness value, tonality value and impulsiveness value of psychoacoustic parameters:
- S=A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+EA=+0.229B=+0.373C=+4.327D=+1.202E=−3.767 (c)
- satisfies the condition of:
- S≦0.6708×Ln (ppm)−2.82416≦ppm≦70 (b).
An image formation apparatus in which, of the loudness value, the sharpness value, the tonality value, the impulsiveness value and the relative approach value of the psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance, the relative approach value satisfies the condition of not larger than 2.21, and the discomfort index S of the sound obtained by the following tone quality evaluation equation (a) expressed in a regression equation, using the regression coefficients of loudness value, sharpness value, tonality value and impulsiveness value:
- S=A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+E0.209≦A≦0.2490.308≦B≦0.4393.669≦C≦4.9840.994≦D≦1.461−4.280≦E≦−3.274 (a)
- satisfies the condition of:
- S≦0.6708×Ln (ppm)−2.82416≦ppm≦70 (b).
An image formation apparatus in which, of the loudness value, the sharpness value, the tonality value, the impulsiveness value and the relative approach value of the psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance, the relative approach value satisfies the condition of not larger than 2.21, and the discomfort index S of sound obtained by the following tone quality evaluation equation (c) expressed in a regression equation, using the regression coefficients of loudness value, sharpness value, tonality value and impulsiveness value of psychoacoustic parameters:
- S=A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+EA=+0.229B=+0.373C=+4.327D=+1.202E=−3.767 (c)
- satisfies the condition of:
- S≦0.6708×Ln (ppm)−2.82416≦ppm≦70 (b).
An image formation apparatus in which the discomfort index S of the sound obtained by the following tone quality evaluation equation (e) expressed in a regression equation, using the regression coefficients of sound pressure level, and loudness value, sharpness value, tonality value and impulsiveness value of the psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance, and ppm (number of printed sheets of paper per minute of A4 lateral size;
- also referred to as cpm) value:
- S=G×(sound pressure level)+A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+F×(ppm value)+E0.0442≦G≦0.08300.0678≦A≦0.16770.3629≦B≦0.50842.5473≦C≦4.0677−0.0533≦D≦0.3279−0.0058F≦0.0006−3.7769E≦7.6274 (e)
- satisfies the condition of:
- S≦0.5432×Ln (ppm)−2.339816≦ppm≦70 (f).
An image formation apparatus in which the discomfort index S of the sound obtained by the following tone quality evaluation equation (g) expressed in a regression equation, using the regression coefficients of sound pressure level, and loudness value, sharpness value, tonality value and impulsiveness value of the psychoacoustic parameters obtained from the operating noise at a position away from the end face of the image formation apparatus by a predetermined distance, and ppm (number of printed sheets of paper per minute of A4 lateral size) value:
- S=G×(sound pressure level)+A×(loudness value)+B×(sharpness value)+C×(tonality value)+D×(impulsiveness value)+F×(ppm value)+EG=+0.0636A=+0.1178B=+0.4356C=+3.3075D=+0.1373F=−0.0026E=−5.7022 (g)
- satisfies the condition of:
- S≦0.5432×Ln (ppm)−2.339816≦ppm≦70 (f).
A tone quality improving method of an image formation apparatus comprising:
- deriving a tone quality evaluation equation capable of evaluating uncomfortable noise emitted from the image formation apparatus, by using the loudness value, sharpness value, tonality value and impulsiveness value, being psychoacoustic parameters;
- and
- decreasing the discomfort index obtained by the equation to a certain value, by reducing the noise having the correlation with a particular psychoacoustic parameter of the psychoacoustic parameters.
Dependencies are inferred from the claim text.