G - Physics – 10 – K
Patent
G - Physics
10
K
179/5
G10K 11/16 (2006.01) B64C 1/40 (2006.01) G10K 11/178 (2006.01)
Patent
CA 1337178
An active noise-reduction system (ANRS) designed to reduce cabin noise in a passenger vehicle, especially to reduce propeller-noise inside an aircraft which is driven by a propeller, unducted fan or gas turbine, includes an electronic controller which has as inputs, firstly an angular position-dependent signal from the or each propeller or analogous rotary component for which noise control is required and, secondly, signals from monitoring microphones positioned in the cabin and has as outputs, signals to loudspeakers. The loudspeakers produce a noise cancellation field to reduce noise in the cabin. The invention may be in combination with a public address system in an environment, such as an aircraft cabin, where noise control is required.
609306
Dorling Christopher Mark
Eatwell Graham Paul
Johnston John Andrew
Langley Andrew John
Ross Colin Fraser
Kirby Eades Gale Baker
Noise Cancellation Technologies Incorporated
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