The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 1979
Filed:
Jan. 16, 1978
Robert H Lacy, Bartlesville, OK (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
The generation of a composite video waveform from three signals representing video data, blanking, and synchronization information is accomplished 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.