Aircraft cabin noise control apparatus

Details Aircraft cabin noise control apparatus Aircraft cabin noise control apparatus

G - Physics

10

K

341/106

G10K 11/16 (2006.01) B64C 1/40 (2006.01) B64C 11/50 (2006.01) G10K 11/178 (2006.01)

Patent

CA 1328004

ABSTRACT Aircraft Cabin Noise Control Apparatus In propeller or fan driven aircraft, cabin noise levels may be reduced by adjustment of the phase relationship between a reference propeller or fan and some or all of the other propellers or fans. An aircraft cabin (1) contains four microphones (2, 3, 4, 5) and two loudspeakers (6, 7) which form the active elements of a noise control system. The microphone outputs are fed via amplifiers (12, 13, 14, 15) to a digital signal processor (11) having an adaptation algorithm in a memory store. The processor generates an error signal which is used to adjust the synchrophase angle between the reference propeller (10) and a synchrophased propeller (9), controlled by a synchrophaser (8). Thus the synchrophase angle is varied dynamically during flight to minimise propeller noise in the cabin over a range of flying conditions.

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