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:
Sep. 15, 1987
Filed:
Dec. 21, 1984
Joseph L LoCicero, Riverside, IL (US);
Melih Pazarci, Chicago, IL (US);
Theodore S Rzeszewski, Lombard, IL (US);
American Telephone and Telegraph Company, AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
A television (TV) system having provision for automatically compensating for signal distortion which would cause artifacts at the point where high- and low-resolution portions of an extended aspect ratio, high-definition TV display are joined together. Compensation parameters are calculated at the TV receiver in response to a known test pattern transmitted during the vertical retrace interval of the TV display and then accessed and utilized to compensate received active display signals. The compensation parameters are calculated by first converting Y, I, and Q signals for the test pattern into digital samples and then processing these digital samples in a digital signal processor unit. After the compensation parameters have been calculated by the digital signal processor, they are stored in a memory. The received active display signals are compensated by accessing the stored compensation parameters during the active display time. Each accessed compensation parameter is converted to an analog signal and is multiplied with received Y, I, and Q edge signals and combined with the center signals to compensate for distortions. In addition, the stored parameters are also averaged over a period of time to stop transient conditions from affecting the stored value of a compensation parameter.