Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1995-12-12
1997-04-01
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
G10K 1116
Patent
active
056174799
ABSTRACT:
The present invention relates generally to global noise or sound control and, more particularly, to the control or sound radiated from stationary induction apparatus such as power transformers and shunt reactors by use of active enclosures and active panels. The purpose of the invention is to markedly reduce the radiation of sound from the machine to all observation points in the surrounding field with a very lightweight, compact, non-airtight structure which does not impair maintenance or repair of the machine.
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O.L.Angevine, "Active Cancellation of the Hum of Large Electric Transformers," Proceedings of Inter-Noise, Jul. 20-22, 1992.
Hildebrand Stephen
Hu Ziqiang
Isen Forester W.
Noise Cancellation Technologies, Inc.
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