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:
Mar. 26, 1991
Filed:
Sep. 11, 1989
Matthias Peters, Halstenbek, DE;
Gerd Onken, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
Circuitry for processing, in a television signal, a first, low-frequency synchronizing signal on which a second, high-frequency synchronizing signal is superposed, for supplying standardized television signal capable of being processed by a customary television signal processing arrangement or display device, respectively by inhibiting a shift between the picture content of the signal representing the television signal and the synchronizing signal. The circuitry includes a first signal processing branch (1) having a low-pass filter (11) for separating low-frequency components and consequently the first synchronizing signal (Sy1) from the television signal, a synchronizing pulse detector (12) for detecting signal variations exceeding a cut-off level (SP) in the low-frequency components, and also a pulse generating stage (13) for producing a pulse when such a signal variation corresponding to a synchronizing pulse of the first synchronizing signal (Sy1) is detected, the pulse being of a duration shorter than the shortest second synchronizing signal (Sy2), a second signal processing branch (2) having a halfwave detector (21) for separating signal peaks exceeding maxima (MaSy1) of the first synchronizing signal (Sy1) from the television signal and for charging a signal store (23) in a first direction during a time interval corresponding to the period of the second synchronizing signal (Sy2), in which the signal peaks occur, and also a third signal processing branch (3) producing a constant reference level during a time interval wherein either a pulse is supplied in the first signal processing stage (1) or the signal store (23) is charged in the first direction, instead of the television signal produced in the remaining time.