System and method for active acoustic control
According to the present disclosure there is provided an active acoustic control system for controlling an acoustic signal propagating along a propagation path, the system comprising: an active control unit configured to: receive information from a first sensor arrangement, the information related to the acoustic signal propagating along the propagation path; generate a control signal for controlling the acoustic signal based on the information from the first sensor arrangement, by being arranged to control: a first control source arrangement comprising a finite 2D array of first control sources for generating a first control signal for controlling a first component of the acoustic signal.
1 . An active acoustic control system for controlling an acoustic signal propagating along a propagation path, the system comprising an active control unit configured to:
receive first information from a first sensor arrangement, the first information related to the acoustic signal propagating along the propagation path;
receive second information from a second sensor arrangement, the second information related to the acoustic signal propagating along the propagation path;
separate transmitted and reflected components from a total acoustic pressure of the acoustic signal propagating along the propagation path using the first information, the second information, and a wave separation algorithm;
control, based on the first information, a first control source arrangement comprising a finite two-dimensional (2D) array of first control sources configured to control the transmitted component of the acoustic signal; and
control, based on the second information, a second control source arrangement comprising a finite 2D array of second control sources configured to control the reflected component of the acoustic signal,
wherein the active control unit is configured to independently control the first control source arrangement and the second control source arrangement.
2 . The active acoustic control system according to claim 1 , wherein the transmitted component is a transmitted component of the acoustic signal.
3 . The active acoustic control system according to claim 2 , wherein the reflected component is a reflected component of the acoustic signal.
4 . The active acoustic control system according to claim 3 , wherein the first control sources are configured to minimize the transmitted component of the acoustic signal, and the second control sources are configured to minimize the reflected component of the acoustic signal.
5 . The active acoustic control system according to claim 1 , wherein the first control source arrangement and/or the second control source arrangement comprises a 2D array of first monopole control sources.
6 . The active acoustic control system according to claim 1 , wherein the first control source arrangement and the second control source arrangement are correspondingly arranged to provide pairs of control sources comprising one of the first control sources from the first control source arrangement and one control source from the second control source arrangement.
7 . The active acoustic control system according to claim 1 , wherein the active control unit comprises:
a first controller arranged to control the first control source arrangement; and
a second controller arranged to control the second control source arrangement.
8 . The active acoustic control system according to claim 1 , wherein the first control source arrangement and second control source arrangement comprise one or more loudspeakers and/or one or more actuators.
9 . The active acoustic control system according to claim 1 , wherein the first sensor arrangement and second sensor arrangement comprise one or more pressure sensors and/or one or more accelerometers.
10 . The active acoustic control system according to claim 1 , comprising an acoustic guide defining the propagation path.
11 . A vehicle and/or a vehicle component, comprising the active acoustic control system according to claim 1 .
12 . A method of controlling an acoustic signal propagating along a propagation path, the method comprising:
receiving first information related to the acoustic signal propagating along the propagation path from a first sensor arrangement;
receiving second information related to the acoustic signal propagating along the propagation path from a second sensor arrangement;
separating transmitted and reflected components from a total acoustic pressure of the acoustic signal propagating along the propagation path using the first information, the second information, and a wave separation algorithm;
controlling, based on the first information, a first control source arrangement comprising a finite two-dimensional (2D) array of first control sources configured to control the transmitted component of the acoustic signal; and
controlling, based on the second information, a second control source arrangement comprising a finite 2D array of second control sources configured to control the reflected component of the acoustic signal,
wherein the active control unit is configured to independently control the first control source arrangement and the second control source arrangement.
13 . The method according to claim 12 , wherein the first control source arrangement and the second control source arrangement comprise one or more loudspeakers and/or one or more actuators.
14 . The method according to claim 12 , wherein the first sensor arrangement and the second senor arrangement comprise one or more pressure sensors and/or one or more accelerometers.