Disclosed is an active-noise control device including two passive attenuation earphones each provided with an external microphone, an internal microphone and a loudspeaker. The control device includes a first processing chain having a feedforward filter, a feedback filter and a reconstruction module. The control device includes a second processing chain having a sound source identification module, said second processing chain being implemented in parallel with the first processing chain, and being suitable for parameterizing the first processing chain.

A planar element is provided for the active compensation of noise from different directions in an interior room. The planar element is equipped with anti-noise modules, each having a microphone and an electronic circuit having a combination of filters for adjusting phase and amplitude and an electronically controllable amplifier and a loudspeaker for active noise cancellation. The planar element is equipped over the width thereof with a plurality of anti-noise modules on each of a plurality of different longitudinally extending lines and is to be placed, for example, in front of a window having bounding walls. The anti-noise modules can be inconspicuously integrated into the planar element and jointly form longitudinally extending chains of anti-noise modules. The loudspeakers emit a canceling sound with respect to the noise, which canceling sound first passes through the planar element and subsequently largely cancels the noise.

A drone includes a motor, a noise receiver, a camera, a distance measurer, and a directed sound beam generator. The noise receiver is configured to detect a noise caused by the motor. The camera is configured to capture an image of an area when the drone is in the air. The distance measurer is configured to measure a distance between the drone and a particular point in the captured image. The directed sound beam generator is configured to emit a sound beam that is directed to a particular direction. The drone further includes a processor configured to analyze the detected noise to determine a frequency spectrum of the detected noise. The processor is further configured to analyze the captured image to identify a target, and cause the directed sound beam generator to emit a sound beam to actively cancel at least a portion of the noise directed to the target.

A cancellation device according to one aspect of the invention is a cancellation device that cancels noise coming to a region in a vicinity of a loudspeaker, the cancellation device including at least two loudspeakers 1 and one reference microphone 3, in which the cancellation device is configured such that an acoustic signal emitted in a sound emission direction of a same loudspeaker and an acoustic signal emitted in an opposite direction collide with each other, the at least two loudspeakers 1 and the reference microphone 3 are arranged on a same plane, the at least two loudspeakers 1 emit cancellation sound that cancels the noise in synchrony, and the plane is a plane including a boundary between a sound emission direction of the two loudspeakers 1 and a direction opposite to a sound emission direction.

A sound system and a method for noise cancellation in a room is provided, the method comprising arranging a set of microphones at a distance from an opening in a wall of the room for provision of one or more microphone input signals including a first microphone input signal; arranging a set of speakers in a vicinity of the opening; determining, based on at least the first microphone input signal, one or more output signals for the set of speakers for matching of sound entering the room through the opening; generating the one or more output signals; and outputting sound signals based on the one or more output signals with the set of speakers.

A planar element is provided for the active compensation of noise from different directions in an interior room. The planar element is equipped with anti-noise modules, each having a microphone and an electronic circuit having a combination of filters for adjusting phase and amplitude and an electronically controllable amplifier and a loudspeaker for active noise cancellation. The planar element is equipped over the width thereof with a plurality of anti-noise modules on each of a plurality of different longitudinally extending lines and is to be placed, for example, in front of a window having bounding walls. The anti-noise modules can be inconspicuously integrated into the planar element and jointly form longitudinally extending chains of anti-noise modules. The loudspeakers emit a canceling sound with respect to the noise, which canceling sound first passes through the planar element and subsequently largely cancels the noise.

A method and system for a noise cancellation comprises an amplifier in communication with three or more speakers disposed in an area. A system controller produces a driver signal for each of the speakers in response to a signal from at least one microphone detecting sound in the area and communicates the driver signals to the amplifier. The amplifier drives each speaker with the driver signal produced for that speaker. In response to the driver signals, the speakers emit sound having a magnitude and phase that combine to attenuate a noise field in the area.

A method and system for a noise cancellation comprises an amplifier in communication with the three or more speakers disposed in an area. A system controller produces a driver signal for each of the speakers in response to a signal from at least one microphone detecting sound in the area and communicates the driver signals to the amplifier. The amplifier drives each speaker with the driver signal produced for that speaker. In response to the driver signals, the speakers emit sound that combined produces a substantially uniform sound pressure field for a particular zone within the area. The substantially uniform sound pressure field produced by the speakers has a magnitude and phase adapted to attenuate a noise field in the area corresponding to the sound detected by the at least one microphone.

A method and a system for reducing undesired interference in a target zone. A set of M pickup sensors pick up undesired signals in real time and generate M pickup signals, M being an integer greater than or equal to 1. A beam forming network coupled to the M pickup sensors comprises a receiving beam forming module and a transmitting beam forming module. The receiving beam forming module receives the M pickup signals and generates K beam signals, K being an integer greater than or equal to 1. The transmitting beam forming module receives the K beam signals and generates N interference signals, N being an integer greater than 1. A set of N injectors coupled to the transmitting beam forming module receives the N interference signals, respectively, and radiates the N interference signals to the target zone.

The present invention is in the field of an active sound-cancellation system, an open fluid-duct comprising such an active sound-cancellation system, such as an air duct, and an active sound-cancellation computer program comprising instructions for operating such an active sound-cancellation system. The active sound-cancellation system reduces noise significantly.