Image forming apparatus and method of evaluating sound...

Details Image forming apparatus and method of evaluating sound... Image forming apparatus and method of evaluating sound...

2007-05-08

2007-05-08

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

Monitoring of sound

C399S091000

Reexamination Certificate

active

10026642

ABSTRACT:
A discomfort index, S, is calculated with an equation, S=0.3135×(Loudness value)+3.4824×(Tonality value)−3.1460. This equation uses a loudness value and a tonality value, both psychoacoustic parameters obtained from a sound from the image forming apparatus at a location 1.00 m±0.03 m apart from an end of the image forming apparatus. A sound caused at the time of charging an image carrier is improved so that the discomfort index S satisfies S<−0.5.

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