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:
Apr. 10, 1984
Filed:
Nov. 02, 1981
John G Ive, Basingstoke, Hampshire, GB;
Alan C Thirlwall, Basingstoke, Hampshire, GB;
Other;
Abstract
Apparatus for example for use in achieving correct field framing on reproduction of a digital television signal from a video tape recorder, by correcting errors in an input square-wave signal which signal alternates between first and second levels every four fields of the television signal, the apparatus comprising first and second similar counters to be supplied with the input signal so as to be enabled to count when the input signal is of the first and said second level respectively, means to detect errors in the input signal and thereupon to supply a signal to disable both the first and second counters, a clock pulse source for supplying a clock pulse signal of high frequency relative to the frequency of the input signal to the first and second counter, and a bistable circuit arranged to be triggered to a first stable condition by an overflow signal from the first counter and to a second stable condition by an overflow signal from the second counter, whereby the bistable circuit supplies a corrected replica of the input signal.