Method of transfer function generation and active noise...

Details Method of transfer function generation and active noise... Method of transfer function generation and active noise...

G - Physics

05

D

354/26, 341/71

G05D 19/02 (2006.01) F01N 1/06 (2006.01) G10K 11/178 (2006.01)

Patent

CA 1318956

ABSTRACT Improved method of transfer function generation and active noise cancellation in a vibrating system 1. A method for the active cancellation of an inci- dent vibration field (N(i.omega.)) which comprises superposing on the incident field, a cancelling vibration field (C(i.omega.)) to create a residual vibration field (R(i.omega.)) and operating on the residual field with a transfer func- tion to obtain an updated cancelling field the transfer function being divided by a reference point (10) into an upstream part (Fi(i.omega.)) and a downstream part (Fo(i.omega.)) and the downstream part (Fo(i.omega.)) of the transfer function being periodically updated by multiplying the last ob- tained value (Fon(i.omega.) by a factor which is the ratio of a computational value of the last cancelling field (Cn(i.omega.)) and a computational value for the sum of previous residual fields (R(i.omega.)). (With Figure 2)

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