Abstract: A chair of modular construction having modules that form the basic chair with additional modules that can be added to the chair without changing the basic construction thereof.

Abstract: A method for fitting a hearing compensation device comprises selecting a plurality of loudness levels for a plurality of frequencies and comparing each loudness level for each frequency for perceived sameness. The loudness levels may then be adjusted as needed to achieve perceived sameness across the frequency spectrum. A gain curve for each frequency is calculated from the selected plurality of loudness levels.

Abstract: A chair control mechanism for use with a single stage gas spring construction for chair height adjustability includes a main control housing having an upwardly directed opening and an upper control housing having a downwardly directed opening. The two housings are dimensioned and configured to nest with one another and are connected by pivot members. An aperture is provided in the main control housing for receiving an end of a gas spring. A bracket assembly is welded to the main control housing and has two apertures both vertically aligned with the aperture of the main control housing and spaced above the aperture of the main control housing. The apertures of the bracket assembly are dimensioned and configured to engage a tapered end of the gas spring and support the control mechanism thereon with the end of the gas spring recessed well up into the control mechanism.

Abstract: A hearing compensation system comprises an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof, a differential analog-to-digital converter sampling the electrical signals output from the input transducer at an input thereof and outputting differential signal samples at an output thereof, a digital signal processing circuit having an input connected to the output of the differential analog-to-digital converter and operating on the differential signal samples to form processed differential signal samples at an output thereof, and an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof, the processed differential signal samples coupled to the input of the output transducer.

Abstract: An analog-to-digital converter according to the present invention comprising a comparator having first and second inputs, and an output, the comparator comparing an analog input voltage at the first input to a tracking voltage at the second input to place a digital output on the comparator output in response thereto, a voltage switching matrix having an input connected to the output of the comparator and an output, an integrator having an input connected to the output of the voltage switching matrix and an output connected to the second input of the comparator to complete a feedback loop and to provide the tracking signal to the second input of the comparator, and a digital filter coupled to the output of the comparator, the digital filter to form a digital output corresponding to the analog input signal at the first input of the comparator.

Abstract: A hinge bracket assembly for a flipper door comprises a bracket body to which a pair of spaced rollers are fitted along an edge thereof. The rollers are spaced slightly from a flange portion of the bracket body to define slots therebetween. A hinge arrangement is provided along a forward edge of the bracket body for hingeable attachment to a cabinet door. The bracket flange portion is slideable within a simple J-channel mounted to an inside wall of the cabinet whereby the rollers bear against a flange surface of the J-channel and serve to inhibit rotational movement of the bracket body relative to the J-channel as the body is guided lengthwise of the channel. A pair of such brackets each mounted to opposite sides of the door thereby allows the door to freely retract into the cabinet without racking.