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. 30, 1991
Filed:
Oct. 06, 1989
Reinhard Kirschenstein, Rossdorf, DE;
BTS Broadcast Television Systems GmbH, Darmstadt, DE;
Abstract
A tri-level HDTV synchronizing pulse signal is compared with first and second reference voltages to provide pulse signals respectively containing the positive and negative pulse of the tri-level signal. A blanking signal is also derived that provides blanking after each H synchronizing pulse for more than half a line duration. It is used in correlation with the separated positive pulses of the tri-level signal to produce H frequency synchronizing pulses. The blanking signal and also another pulse signal are generated by a four bit counter which is clocked by a clock signal having four times the H frequency and has the logic 1 voltage applied to that input of the counter where it will signify the binary number 4. These signals make possible the derivation of both a picture field synchronizing pulse of vertical scanning frequency V and a frame synchronizing signal of half that frequency, a pair of D-flipflops being used to provide these outputs. The first reference voltage may be ground potential if a slightly delayed output of the separated negative pulses is used to blank out the intervals between the separated positive pulses.