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Dynamic Video Referencing

IP.com Disclosure Number: IPCOM000074036D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Dorr, RL: AUTHOR

Abstract

This circuit is used for implementing a video thresholding technique of eliminating drift components by the introduction of a differential voltage which is a function of the desired clipping level.

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Dynamic Video Referencing

This circuit is used for implementing a video thresholding technique of eliminating drift components by the introduction of a differential voltage which is a function of the desired clipping level.

The circuit could be used for any other applications where the output is required to be a noninverting linear function of the input amplitude and an inherent compensation for DC shifts is required.

The white follower voltage is introduced into both sides of the differential amplifier (LCOA) in a particular ratio. This ratio is proportional to unity minus the clipping percentage. The circuit allows for DC shifts in an analog video signal such as a base line bow across a scanned document. The technique can be used when any desired output is a linear function of input amplitude and the DC level of the input signal is known to vary over reasonable limits. A circuit requirement is that the measured (Vp-V omega) noninverting, would have reference to an arbitrary voltage.

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