Abstract:
An apparatus for realizing an active noise cancellation control law transfer function between a sensing microphone and a speaker. The apparatus includes a multiplicity of filters. Each filter is operable over a different frequency range. At least one filter has an adjustable parameter whereby the filter can be adjusted such that the filters cumulatively realize a required control law transfer function. The adjustable parameter may in one embodiment be the amplitude. In other embodiments, it may be other parameters.
Abstract:
An active noise reduction system for use with an ear piece uses an ultrasonic signal to determine the acoustic coupling between a speaker and a sensor microphone of the noise reduction system. The determination of the acoustic coupling may be used to adjust the game of the system to provide a closed loop game which optimises performance of the system.
Abstract:
An illumination device comprising an LED (14) mounted on a rear of a PCB (12), and a light pipe (16) to direct light from the LED through an aperture (18) in the PCB to illuminate a legend (10) on the front of the PCB, the light pipe diffusing the light so as to prevent uneven illumination of the legend.
Abstract:
A printed circuit board is provided with protection means for protecting one or more components of the printed circuit board (PCB). The protection means includes a sleeve member located on the PCB around at least one component of the PCB. The protection means further includes cover means for covering a whole or substantial part of an opening of said sleeve member. The cover means is formed from or includes mica.
Abstract:
A status indicator (4) for a transparent ceramic glass cook top is disclosed which is able to display a range of colors. Typically such indications are used with red or smoked glass cooktops and are limited to red. The present invention is positioned directly underneath the transparent glass (22) which has an opaque layer (23) on the underside and wherein a portion (24) of the opaque layer has been removed thereby allowing the light source (2) to be visible directly above said cook top. The indicator may be used for a range of functions, including indicating the element is on and also that the heating region is too hot to be safely touched.
Abstract:
An apparatus assists a user to move a door between closed and open states. The apparatus includes a permanent magnet provided on the door. An electromagnet is located on the door frame adjacent thereto when the door is closed and is energizable to provide a magnetic field which reinforces the permanent magnetic field or to provide a magnetic field in opposition to the permanent magnetic field. A detector detects the state of the door and an interface detects the presence of a user. A controller receives input from the detector and the interface and energizes the electromagnet to provide a reinforcing magnetic field if a user is attempting to open the door and provides an opposing magnetic field to the permanent magnetic field if the door is closed and the user is attempting to open the door.
Abstract:
A noise cancellation system includes a headphone having a sound transducer and a headphone speaker. Noise cancellation circuitry is provided remote from the headphone and supplies the headphone speaker and is supplied from the sound transducer. A filter normalizes the output from the sound transducer of the headphone to the noise cancellation circuitry.
Abstract:
An illumination device comprising an LED (14) mounted on a rear of a PCB (12), and a light pipe (16) to direct light from the LED through an aperture (18) in the PCB to illuminate a legend (10) on the front of the PCB, the light pipe diffusing the light so as to prevent uneven illumination of the legend.
Abstract:
An apparatus for realizing an active noise cancellation control law transfer function between a sensing microphone and a speaker. The apparatus includes a multiplicity of filters. Each filter is operable over a different frequency range. At least one filter has an adjustable parameter whereby the filter can be adjusted such that the filters cumulatively realize a required control law transfer function. The adjustable parameter may in one embodiment be the amplitude. In other embodiments, it may be other parameters.
Abstract:
A printed circuit board is provided with protection means for protecting one or more components of the printed circuit board (PCB). The protection means includes a sleeve member located on the PCB around at least one component of the PCB. The protection means further includes cover means for covering a whole or substantial part of an opening of said sleeve member. The cover means is formed from or includes mica.