Active acoustic control system and method
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 independently control: a first control source arrangement for generating a first control signal to control a first component of the acoustic signal; and a second control source arrangement for generating a second control signal to control a second 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 for sensing a residual error signal along the propagation path;
separate a transmitted component and a reflected component 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 method; and
generate a control signal for controlling the acoustic signal based on the first information from the first sensor arrangement, the second information from the second sensor arrangement, the transmitted component, and the reflected component, by being arranged to independently control
a first control source arrangement for generating a first control signal to control a first component of the acoustic signal, and
a second control source arrangement for generating a second control signal to control a second component of the acoustic signal.
2 . 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.
3 . The active acoustic control system according to claim 1 , wherein the first component of the acoustic signal is the transmitted component, and the second component of the acoustic signal is the reflected component.
4 . The active acoustic control system according to claim 1 , wherein the first control source arrangement faces downstream relative to the propagation path and the second control source arrangement faces upstream relative to the propagation path.
5 . The active acoustic control system according to claim 1 , wherein the active control unit comprises the first control source arrangement and the second control source arrangement.
6 . The active acoustic control system according to claim 1 , wherein the sensor arrangement comprises one or more pressure sensors and/or one or more accelerometers.
7 . The active acoustic control system according to claim 1 , wherein the sensor arrangement is a first sensor arrangement, and the active control unit is configured to receive information from a second sensor arrangement for sensing an error signal.
8 . The active acoustic control system according to claim 7 , wherein the second sensor arrangement is provided downstream of the active control unit along the propagation path.
9 . The active acoustic control system according to claim 7 , wherein the second sensor arrangement comprises 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 . The active acoustic control system according to claim 1 , wherein the first control source arrangement and second control source arrangement are arranged in a one-dimensional manner along the propagation path.
12 . The active acoustic control system according to claim 1 , wherein the first control source arrangement comprises a 2D array of first control sources, and/or the second control source arrangement comprises a 2D array of second control sources.
13 . 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.
14 . A vehicle and/or a vehicle component, comprising the active acoustic control system according to claim 1 .
15 . 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 from a second sensor arrangement for sensing a residual error signal along the propagation path;
separating a transmitted component and a reflected component 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 method; and
generating a control signal for controlling the acoustic signal based on the first information from the first sensor arrangement, the second information from the second sensor arrangement, the transmitted component, and the reflected component by independently controlling
a first control source arrangement for generating a first control signal for controlling a first component of the acoustic signal, and
a second control source arrangement for generating a second control signal for controlling a second component of the acoustic signal.
16 . 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 for sensing a residual error signal along the propagation path;
separate a transmitted component and a reflected component 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 method; and
controlling the acoustic signal based on the first information from the first sensor arrangement, the second information from the second sensor arrangement, the transmitted component, and the reflected component by being arranged to independently control
a first control source arrangement for generating a first control signal to control a first component of the acoustic signal, and
a second control source arrangement for generating a second control signal to control a second component of the acoustic signal;
wherein the active control unit includes
a first controller arranged to control the first control source arrangement, and
a second controller arranged to control the second control source arrangement.
17 . The active acoustic control system according to claim 16 , wherein the first component of the acoustic signal is the transmitted component, and the second component of the acoustic signal is the reflected component.
18 . The active acoustic control system according to claim 16 , wherein the first control source arrangement faces downstream relative to the propagation path and the second control source arrangement faces upstream relative to the propagation path.
19 . The active acoustic control system according to claim 16 , comprising an acoustic guide defining the propagation path.
20 . The active acoustic control system according to claim 16 , wherein the sensor arrangement includes one or more pressure sensors and/or one or more accelerometers, and wherein the first control source arrangement and second control source arrangement comprise one or more loudspeakers and/or one or more actuators.