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

Claim 0:
1. A method for creating a plurality of sound zones within an acoustic cavity, comprising:
providing a plurality of actuators within the acoustic cavity, each for generating a respective acoustic output in response to a respective drive signal,
providing, for each of the plurality of actuators, an adaptive filter for receiving a respective input signal, and generating a respective output signal,
providing, for each of the adaptive filters, at least one filter coefficient,
providing a plurality of error sensors within the acoustic cavity, each for generating a respective error signal e, representing a respective sound detected by the respective error sensor,
providing an audio data signal x(n) for generating a desired sound in a desired sound zone of the plurality of sound zones,
providing, 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 receives the provided audio data signal x(n) as the input signal, and generates a respective output signal y(n) based on the input signal and the at least one filter coefficient;

providing, for each of the plurality of actuators, the respective drive signal for generating the respective acoustic output, comprising:
generating a respective generation input signal, based on the set of actuator generation coefficients kgk and the provided audio data signal x(n);
generating a respective exclusion input signal, based on the set of actuator exclusion coefficients kek and the respective output signal y(n);
generating the respective drive signal based on the respective generation input signal and the respective exclusion input signal; and

generating, for each of the adaptive filters, at least one respective updated filter coefficient, comprising:
generating a respective weighted error signal, based on the set of sensor weighting coefficients mem and the respective error signal e;
generating 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;
generating 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.