Title:
【発明の名称】運搬具客室における騒音減少
Document Type and Number:
Japanese Patent JPH04500566
Kind Code:
A
Abstract:
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 (12) which has as inputs (10, 14), 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 (14) positioned in the cabin and has as outputs, signals to loudspeakers (16). The loudspeakers (16) produce a noise cancellation field to reduce noise in the cabin. The invention may be employed in combination with a public address system in an environment, such as an aircraft cabin, where noise control is required.
Inventors:
Ross, Colin Fraser
Doolin, Christopher Mark
Eatwell, Graham Paul
Langley, Andrew Joan
Sutcliffe, Sean George Cronin
Johnston, Joan Andrew
Doolin, Christopher Mark
Eatwell, Graham Paul
Langley, Andrew Joan
Sutcliffe, Sean George Cronin
Johnston, Joan Andrew
Application Number:
JP50947189A
Publication Date:
January 30, 1992
Filing Date:
August 18, 1989
Export Citation:
Assignee:
Active Noise and Vibration Technologies, Inc.
International Classes:
B64D47/00; B64C1/40; G10K11/178; (IPC1-7): B64D47/00; G10K11/16
Attorney, Agent or Firm:
Hisami Fukami (4 outside)