Noise masking system and method in image forming apparatus

Details Noise masking system and method in image forming apparatus Noise masking system and method in image forming apparatus

1998-05-14

1999-07-27

Beatty, Robert

Electrophotography

Internal machine environment

381 731, G03G 2120

Patent

active

059305576

ABSTRACT:
A noise masking system in an image forming apparatus such as a laser beam printer or a copying machine having a drive mechanism acting as a noise generation source during operation, the noise masking system comprising a masking sound generator for generating a sound to mask the noise and masking sound control device which controls the masking sound generator to generate a masking sound of a frequency range including a main-component frequency of the noise. The masking sound thus generated is of a frequency range from a lower-limit frequency to an upper-limit frequency in a critical band of the main-component frequency of the noise. The noise masking system masks noise without decreasing the sound pressure of the noise.

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patent: 5289147 (1994-02-01), Koike et al.
patent: 5638454 (1997-06-01), Jones et al.
patent: 5652799 (1997-07-01), Ross et al.
patent: 5784670 (1998-07-01), Sasahara et al.

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