H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/40
H04N 5/00 (2006.01) H04N 5/067 (2006.01)
Patent
CA 1126858
26604 COMPOSITE VIDEO WAVEFORM GENERATOR Abstract of the Disclosure The generation of a composite video waveform three signals representing video data, blanking, and synchronization information is accom- plished by supplying the video data, blanking and synchronization signals to the cathode side of three different diode circuits. The three different diode circuits are tied to a common voltage source on the anode side of the diode circuits. The forward voltage drop across the diode circuits determines the signal level seen by a video monitor in response to the video data, blanking, and synchronization signals. In a preferred embodiment, at least one Schottky diode is utilized in each diode circuit to provide sharp edge definition for the composite video waveform. In a less preferred embodiment, conventional silicon switching diodes are used to replace the Schottky diodes but a sacrifice in edge definition for the composite video waveform results.
319378
Osler Hoskin & Harcourt Llp
Phillips Petroleum Company
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