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. 24, 1999
Filed:
May. 01, 1997
Gangolf Hirtz, Niedereschach, DE;
Thomas Hollmann, Villingen-Schwenningen, DE;
Michael Maier, Villingen-Schwenningen, DE;
Deutsche Thomson-Erandt GmbH, Villingen-Schwenningen, DE;
Abstract
For many signal processing arrangements in TV receivers it is necessary to know the type of signal source. A plurality of parameters must be set depending on whether a standard-conforming source and hence a standard signal or a non-standard source (for example VCR) is involved. The circuit according to the invention is capable of making a statement in a TV receiver as to whether or not a source corresponding to the TV standard is present. For this purpose, the locking of the color subcarrier with the horizontal frequency is investigated and two different criteria (FSCFH, CCC) are utilized for the decision. The optimized setting of parameters in the receiver is possible with the aid of the decision made. Furthermore, the circuit provides, in the event of a standard signal, a highly stable sampling clock (fLL1) of the kind necessary, for example, for ColorPlus processing within the PALplus system.