Faurecia Creo Ab

Robert Risberg

Christophe Mattei

Nicolas Jean Pignier

Nicolas Jean Pignier Delafontaine

A noise controlling method includes generating a reference signal representing a primary noise, generating a secondary noise in response to a control signal for cancelling the primary noise, generating an error signal representing a superposition of the primary and secondary noises at a position, generating an additional reference signal, secondary noise, or additional error signal, and generating the control signal for generating the secondary noise using adaptive subband filtering based on the reference and error signals, the generating the control signal including decomposing the reference signal and the error signal into a subband reference and error signal for each subband, updating subband adaptive filters for a subband based on the subband reference signal and the subband error signal, updating a fullband adaptive filter based on the updated subband adaptive filter, and generating the control signal by filtering the reference signal by the updated fullband adaptive filter.

Noise controlling method and system

A method for reducing the power of an acoustic primary noise signal (d(n)) at one or more control positions in a vehicle passenger compartment using an adaptive filter. The method comprising to compare a mean correlation coefficient (&#x3b3;(n)) between an electrical error signal (e(n) and a modelled secondary anti-noise signal &#x177;(n) with at least one predefined threshold (&#x3b1;, &#x3b2;).

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Linköping, Sweden

Robert Risberg