An image forming apparatus includes a housing, a mechanism, mounted in the housing, for forming images on a medium, an operation panel formed on the housing, the mechanism being driven in accordance with an operating instruction input from the operation panel by an operator, a microphone, provided in...http://www.google.es/patents/US5289147?utm_source=gb-gplus-sharePatente US5289147 - Image forming apparatus having system for reducing noise
Image forming apparatus having system for reducing noise
