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:
Dec. 18, 1990
Filed:
Nov. 22, 1988
Theodore S Rzeszewski, Lombard, IL (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
A digital subsystem for improving the resolution of a TV digital signal by inserting additional digital samples into the digital TV signal in response to the correspondence of the digital signal and predefined patterns. The digital subsystem is a logic circuit which is responsive to received digital samples to group these digital samples into sets of samples. The digital circuit then calculates the slope between pairs of digital samples of each set and utilizes the calculated slopes to determine the correspondence to the predefined patterns. The determined predefined pattern designates the digital sample to be inserted into each set. The inserted digital sample is either equal to one of the digital samples or the average between two of the digital samples of each set. The calculation of the slopes results in a logical '0' for a constant slope and a logical '1' for a negative or a positive slope. An Exclusive OR gate is utilized to make the determination of whether to use a value equal to one of the digital samples of the set or the average of the value of two of the digital samples. A slope is considered constant if the difference between the pair of digital samples is less than a value calculated from range information of the set of samples.