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:
Jul. 20, 2004
Filed:
Apr. 01, 1997
Christopher D. Voltz, Houston, TX (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A simulated burst gate signal and a video synchronization key are generated. A video decoder generates a horizontal sync pulse which is programmed to envelop a color burst, thereby simulating a burst gate signal. The offset to the horizontal sync pulse due to simulating a burst gate signal may be compensated at a video memory subsystem receiving the horizontal sync signal, in order to determine when active pixels are provided by the video decoder. Alternatively, counter circuitry external to the video decoder may be used to generate a simulated burst gate signal by counting the number of pixel clock cycles between the horizontal sync pulse and the color burst. Unlike a burst gate signal generated within a video decoder for use with color separation circuitry in the video decoder, a simulated burst gate signal allows for use of color separation circuitry external to the video decoder. Detecting a color burst using external color separation circuitry is thus also disclosed. The programmable horizontal sync pulse of a video decoder is capable of being programmed and later compensated. The programmable horizontal sync pulse thus may also be used as a synchronization key for video devices.