Method and apparatus for AC coupling a signal while...

Details Method and apparatus for AC coupling a signal while... Method and apparatus for AC coupling a signal while...

2008-09-09

2008-09-09

Natnael, Paulos M (Department: 2622)

Television

Image signal processing circuitry specific to television

Dc insertion

Reexamination Certificate

active

11015728

ABSTRACT:
A system in which drooping of the video levels due to leakage currents and proper DC bias level is addressed by providing a charge into the video signal to offset the leakage currents and to provide DC bias. To determine the leakage current level, measurements are made measuring the voltages of the syncs and the blanking intervals. To determine the DC bias, a measurement is made of the sync. Over a series of video lines these measurements are averaged. If the average is below the desired level, a charge is provided via a current source to the incoming signal. By having the current source provide charge during each video line, droop is reduced and the proper DC bias is provided.

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