Patent ID: 11862139
Assignee: FAURECIA CREO AB
Field: Other consumer goods (Other fields)
Classification: CPC G  H | IPC G  H

Claim 22:
23. A system for creating a plurality of sound zones within an acoustic cavity, comprising:
a plurality of actuators within the acoustic cavity, each configured to generate a respective acoustic output in response to a respective drive signal,
an adaptive filter operatively connected to each of the plurality of actuators, configured to receive a respective input signal, and generate a respective output signal,
wherein each of the adaptive filters is provided with at least one filter coefficient,

a plurality of error sensors within the acoustic cavity, each configured to generate a respective error signal e, representing a respective sound detected by the respective error sensor,
a control unit, configured to:
receive an audio data signal x(n) for generating a desired sound in a desired sound zone of the plurality of sound zones, and
provide, for the desired sound zone, a set of actuator generation coefficients kgk, a set of actuator exclusion coefficients kek, wherein k refers to a kth actuator, k=1, 2, 3 . . . , and a set of sensor weighting coefficients mem wherein m refers to a mth error sensor, m=1, 2, 3 . . . ;

wherein each of the adaptive filters is configured to receive the provided audio data signal x(n) as the input signal, and to generate a respective output signal y(n) based on the input signal and the at least one filter coefficient;
the control unit is further configured to:
provide, for each of the plurality of actuators, the respective drive signal for generating the respective acoustic output, wherein the control unit is further configured to:
generate a respective generation input signal, based on the set of actuator generation coefficients kgk and the provided audio data signal x(n);
generate a respective exclusion input signal, based on the set of actuator exclusion coefficients kek and the respective output signal y(n);
generate the respective drive signal based on the respective generation input signal and the respective exclusion input signal; and
generate, for each of the adaptive filters, at least one respective updated filter coefficient;
generate a respective weighted error signal, based on the set of sensor weighting coefficients mem and the respective error signal e;
generate a reference signal x′(n) based on the provided audio data signal x(n), the set of actuator exclusion coefficients kek, and a secondary sound path model Ŝ representing a plurality of acoustic transmission paths from each of the plurality of actuators to each of the plurality of error sensor; and
generate the respective updated filter coefficient based on the respective weighted error signal and the reference signal x′(n), to reduce the respective weighted error signal.