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:
Nov. 10, 1987
Filed:
Nov. 05, 1986
Hans-Peter Richter, Griesheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The synchronously demodulated chrominance signals (C.sub.1d, C.sub.2d) each alternately represent, line by line, the sum and difference of the color difference signals U and V. They are supplied to a multiplexer (21) switched by a meander wave having a 2H oscillation period and supplied therefrom to an accumulator for evaluation of the synchronizing color carrier bursts. During the burst, a succession of sampling frequency pulses sample the burst portion of one chrominance signal (C.sub.2d) with the results being added in an accumulator and then loaded in a first register (25) to provide a control signal for the color carrier oscillator and from the burst portion of the other chrominance signal (C.sub.1d) a potential is similarly produced by the accumulator, loaded in a second register (26) and evaluated in a PROM to determine whether the switching of the reversal circuit or one of the color difference signals (V) is timed for the correct horizontal line or for the wrong one. In the latter case, the meander wave is held for a half period of its oscillation which in effect inverts it, thereby correcting its timing.