The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2003
Filed:
Mar. 25, 1998
Tadashi Ohashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The invention provides an acoustic cooling system with a noise reduction function of the type wherein a driving condition of a sound source used in the acoustic cooling system is controlled to compress coolant by a sound wave and a cooling object is cooled making use of an endothermic action of the coolant when the compressed coolant is expanded and which can reduce noise produced from the sound source effectively. To this end, the acoustic cooling system forwards cancellation sound having a characteristic capable of offsetting or cancelling the noise originating from the sound source and includes a cancellation signal production element for producing, in accordance with a driving control signal produced by a sound source control element, a cancellation signal having a characteristic capable of cancelling the noise produced as the sound source is driven, a cancellation signal level adjustment element for adjusting the signal level of the cancellation signal in accordance with the driving control signal, and a cancellation sound outputting element for converting the cancellation signal having the adjusted signal level into a sound wave and outputting the sound wave as the cancellation sound for the noise.