Method of transfer function generation and active noise cancella

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

1988-03-25

1990-08-07

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

049474359

ABSTRACT:
A method for the active cancellation of an incident vibration field (N(i.omega.)) wherein a cancelling vibration field (C(i.omega.)) is superposed on the incident field to create a residual vibration field (R(i.omega.)). The residual field is operated on with a transfer function 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.)). The downstream part (Fo(i.omega.)) of the transfer function is periodically updated by multiplying the last obtained value (Fo.sub.n (i.omega.) by a factor which is the ratio of a computational value of the last cancelling field (C.sub.n (i.omega.)) and a computational value for the sum of previous residual fields (R(i.omega.)).

REFERENCES:
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Chaplin "Anti-noise-The Essex Breakthrough", CME, Jan. 1983, pp. 41-47.

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