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:
Oct. 08, 1991
Filed:
Apr. 10, 1990
Marc Klingelhofer, Fremont, CA (US);
Sony Corporation of America, Park Ridge, NJ (US);
Abstract
A digital video frame recorder which includes an internal video display test pattern signal generator constructed substantially from already existing circuitry and hardware. A microprocessor and read only memor ('ROM') and/or random access memory ('RAM') used for performing preprogrammed self-diagnostic testing upon the digital video frame recorder are additionally programmed so that the user can selectively enable the internal video display test pattern signal generator. The internally generated video display test pattern signal data is stored within the frame memory in memory locations not normally used for storage of externally sourced video data. The internally generated video display test pattern signal data can be generated by sequentially reading out preprogrammed video display test pattern signal data directly from the ROM or RAM, or by having the microprocessor execute preprogrammed instructions stored in the ROM or RAM and thereby compute the video display test pattern signal data directly.