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:
Aug. 15, 1989
Filed:
Apr. 13, 1987
Gerardus J Vos, Eindhoven, NL;
Louis J Van Mal, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A television signal memory (21) for use, for example, in a circuit for increasing the number of fields with interleaved writing and reading, is controlled by a data signal to be written into (at 19) with the aid of a write clock signal (at 77), this data signal being obtained by sampling (at 5) of the television signal by means of a data clock signal (at 25) coupled to the line frequency of the television signal (37, 41). A phase detection circuit (33) detects each time a given phase relation, between the data clock signal (at 31) and a memory clock signal (at 51) obtained form a free running memory clock signal generator (55) having a higher frequency than the highest data clock signal frequency, is exceeded, and then suppresses a memory clock signal pulse in a pulse suppression circuit (71), and shifts the data in a data shift circuit (15) so that the memory receives a single write clock signal pulse during the occurrence of each data period.