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. 13, 1976
Filed:
May. 30, 1975
John Albert Coffey, Newbury, EN;
Quantel, Limited, , EN;
Abstract
The apparatus for comparing clock phase identification signals in a time base corrector so as to control the Writing and Reading of information into and out of storage means therein, the storage means including a plurality of stores for storing sequential line information. The apparatus includes means for deriving in-phase and anti-phase 'Write' clock phase identification signals from line frequency sync signals. Selector means select one of the in-phase or anti-phase signals and first latch means receive the selected one of the signals. Means are provided for simultaneously deriving a 'Read' clock phase identification signal at a frequency which is half the line frequency from a sub-carrier reference signal. Second latch means receive the Read clock phase identification signal and comparator means compare the output signals from the first and second latch means to produce a Write clock phase identification control pulse so as to select the other of the in-phase and anti-phase Write clock phase identification signals in the selector means when the states of the signals applied to the comparator means are dissimilar.