Abstract: The present disclosure relates to an active acoustic control system comprising: a first sensor arrangement arranged to sense an acoustic signal in the region of an object, the acoustic signal having a scattered acoustic pressure component and a total acoustic pressure, the first sensor arrangement being arranged to sense the total acoustic pressure of the acoustic signal; a processor configured to: apply a filter to filter the total acoustic pressure and provide a filtered output signal; and estimate the scattered acoustic pressure component based on the filtered output signal from the filter; and a control source arrangement operable to control the scattered acoustic pressure component based on the estimation and a regularisation parameter determined based on a relationship between: level of control of the scattered acoustic pressure component of the acoustic signal when controlled using the control source arrangement of the system using a set of test regularisation parameters.

Abstract: 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.

Abstract: 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.

Abstract: According to the present invention there is provided a resonator comprising: a base attachable to an external body; a control element; and one or more connection elements each having a resilient spiral portion, wherein the control element is resiliently connected to the base by the one or more connection elements such that relative movement between the control element and the base is facilitated by the one or more connection elements.

Abstract: According to the present invention there is provided a vibration control system comprising: a resonator comprising: a base attachable to an external body; a control element; and one or more connection elements each having a resilient portion, wherein the control element is resiliently connected to the base by the one or more connection elements such that relative movement between the control element and the base is facilitated by the one or more connection elements; and a driving mechanism, wherein the resonator comprises at least a part of the driving mechanism.

Abstract: A structural damper (2) having an acoustic black hole (5), at least one sensor (7), a damper structure (4), an actuator (8) configured to apply an actuating force to the damper structure (4) and a controller (H) configured to control the actuator in dependence on a signal from the at least one sensor so as to provide structural damping of a primary structure (3).

Abstract: A structural damper (2) having an acoustic black hole (5), at least one sensor (7), a damper structure (4), an actuator (8) configured to apply an actuating force to the damper structure (4) and a controller (H) configured to control the actuator in dependence on a signal from the at least one sensor so as to provide structural damping of a primary structure (3).

Abstract: A personal sound zone creating apparatus includes a broadside array adapted to generate a sound beam orthogonal to an arrangement of an array constituted by at least three transducers in a personal audio device. Therefore, the personal sound zone creating apparatus controls rear radiation by including an end-fire array increased in directivity in a horizontal direction.