BRIGHTNESS AND AUTOMATIC KINESCOPE BIAS CONTROL IN A VIDEO SIGNAL PROCESSOR WITH AN AC COUPLED KINESCOPE DRIVER

摘要

Abstract of the DisclosureA wideband video signal processor includes akinescope driver stage which is AC coupled to thekinescope, and an automatic kinescope bias (AKB) controlsystem. During AKB operating intervals, the kinescope isenergized so as to produce a cathode output pulse with amagnitude related to the level of black current conductedby the kinescope. Brightness control is achieved bycoupling a brightness control voltage to a signal pathwhich conveys the cathode output pulse to AKB signalprocessing circuits.