Wavephore, Inc.

Scientific Growth, Inc.

Melvyn Engel

Michael A Sowell

Michael D Bethel

Judson L Smith

Glen Var Rosenbaum

Richard C Kudlicki

William E Crisp

Michael J Smith

A tuner specifically adapted for recovery of a data signal injected into a video signal and then subsequently transmitted over a television channel or cable is disclosed. The tuner includes an IF local oscillator that is phase locked to the input signal sync pulses and has filters that are designed to pass through only the data bandwidth. In addition, the circuit has a low noise figure of about 1.5 dB and a third order intercept point of +35 dBm.

High performance data tuner for video systems

A delta modulator automatically adjusting the slewing rate is disclosed. In the absence of a transition in the output data of a delta modulator, a parameter used for the integrator of the delta modulator is increased. When the comparator of the modulator indicates that the feedback signal of the modulator has overshot the input signal, the parameter is decreased or reversed until the two signals are approximately equal as signalled by a 50% duty cycle.

Software controlled adaptive delta modulator

A delta modulator automatically adjusting the slewing rate is disclosed. In the absence of a transition in the output data of a delta modulator, the current used for the integrator of the delta modulator is increased. When the comparator of the modulator indicates that the feedback signal of the modulator has overshot the input signal, the current is decreased or reversed until the two signals are approximately equal as signalled by a 50% duty cycle.

Digitally controlled adaptive slew rate delta modulator

Method and apparatus for periodically cleaning washing apparatus in which washing liquid is intermittently circulated through a washing chamber adapted to contain the hand of a user. Cleaning is accomplished by intermittently circulating a cleaning liquid through the chamber while displaying a warning to potential users to not use the apparatus during the cleaning cycle. Cleaning is initiated (a) when the apparatus has been used for hand washing a predetermined number of times, (b) a predetermined period of time has elapsed since the last cleaning cycle, (c) the apparatus has been serviced, or (d) following interruption of the electrical power supply to the apparatus.

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Scottsdale, AZ, United States of America

Melvyn Engel