Faurecia Creo Ab

A2 Acoustics Ab

Magna International Inc.

Fredrik Samuelsson

Anthony John Povinelli

Thomas Pilette

Todd Deaville

Mats Olle Gustavsson

Urban Emborg

Gustav Kristiansson

Peter Davidsson

Gregory D Rizzo

Siv Leth

A method for reducing noise in at least one monitor position in a vehicle compartment by actively controlling the power of a primary noise (d(t)) as sensed at two or more control positions in the vehicle compartment, the method comprising the updating of filter coefficient(s) of (an) adaptive filter(s) (w(n)) based on variable contribution of error sensors and actuator(s) for different noise source operating conditions.

Active noise control method and system using variable actuator and sensor participation

The invention refers to a device for sound control in a space () with a sound field from at least one sound source (). The device includes a pulse sensor (), which provides a pulse signal from the sound source (). Moreover, the device includes a number of sound influencing members () for reducing the sound field in the space () and a number of sound sensors (), which sense the actual sound field in the space and provide an error signal. A control unit includes a signal supplied device (), which receives a pulse signal and supplies a first signal to an adaptive filter (). The filter has a number of filter coefficients and generates a drive signal for each sound influencing member (). The signals supply device also supplies second signals to a calculating member (), which calculates the value of the filter coefficients by the second signals and the error signals for updating the adaptive filter (). A detecting member detects phase and frequency of the pulse signal and a coefficient table provides two sets of coefficients for generating the second signals from detected phase and frequency of the pulse signal.

Device for active sound control in a space

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Borensberg, Sweden

Fredrik Samuelsson