North American Philips Corporation

Texas Instruments Corporation

Northrop Grumman Systems Corporation

Steven C Brummette

William G Miller

William Robert Krenik

Norman L Culp

James F Asbury

Christopher True

A wireless control system for ground-mobile robotic systems in which communication between the operator control unit and the unmanned ground vehicle is transmitted via a plurality of spectrally efficient simplex communication links.

Wireless control system for ground-mobile robotic vehicles

A clamp circuit including a clamping capacitor and a differential amplifier charge and discharge the clamping capacitor in accordance with the magnitude of difference signals applied to the differential amplifier's inverting and non-inverting inputs. The inverting input receives the voltage produced by the clamping capacitor. This voltage is digitized by an analog-to-digital converter (ADC) and is set to a reference voltage range by a voltage divider network. The ADC output signal is compared to a given reference level corresponding to a selected voltage in the reference voltage range to produce a difference output signal. This difference output signal is summed with the selected voltage in the reference voltage range and applied to the non-inverting input of the differential amplifier to produce a clamp voltage with substantially minimum offsets due to the amplifier, ADC and DAC. A clamp enable signal operates the clamping circuit during a blanking interval of a video signal applied to the clamping capacitor. A digital processing circuit of a television receiver receives the video signal clamped to the level of the clamp voltage. Instead of processing the video signal at the clamped level, a blanking signal code word is inserted in the clamped video signal to save memory. The video signal applied to the digital processing circuit is thus clamped to the voltage level by the inserted code word.

Clamping circuit with offset compensation for analog-to-digital

A video sharpness circuit comprising a delay circuit and a mixer for mixing an input video signal and the input video signal delayed by the delay circuit to develop an output video signal having improved sharpness. The mixer has a nonlinear gain for sharpening higher amplitude video signals more than lower amplitude video signals, and a circuit for adjusting the nonlinearity of the mixer.

Adjustable video sharpness circuit

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Knoxville, TN, United States of America

Steven C Brummette