Patent ID: 8144250

Claim:
A method of processing a video signal wherein normal composite sync signal parameters of said video signal have been compromised by the introduction of extraneous sync signals into said video signal and normal DC levels of said composite synchronizing signal parameters have been compromised by the introduction of extraneous AGC pulses into said video signal whereby said normal composite sync signal parameters and said normal DC levels of said video signal are restored and regulated comprising the step of: receiving an input video signal; extracting a composite sync signal from said input video signal; providing reference points from within said composite sync signal; generating a plurality of composite sync signal portions in response to said providing step; wherein said composite sync signal portions are comprised of elements selected from the group consisting of sync pulse, back porch pulses and pulse-to-pulse intervals; logically processing said composite sync signal of said extracting step with said composite sync signal portions of said generating step using sequential logic operations; wherein said logically processing step produces a corrected composite sync signal; wherein said logically processing step produces a corrected inverted composite sync signal; wherein said logically processing step produces a pseudo sync signal of said extraneous sync signals; insertion of said corrected inverted composite sync signal into said video signal; removal of said pseudo sync signal from said input video signal; wherein said insertion step and said removal step are combined in a buffer step; whereby said buffer step produces a sync corrected video signal; generating a plurality of DC levels; generating a plurality of selection signals in response to said providing step; wherein only one signal of said selection signal is active at any one time; selection of a DC level from said DC levels in response to said one signal; generating a control signal representative of DC level dispersion of said normal DC levels in response to said providing step; electronic clamping of said sync corrected video signal to said DC level from said selection step in response to said control signal; whereby said electronic clamping produces an AGC/sync corrected video signal.