Patent · US Expired

Method and circuit arrangement for distinguishing between standard and non-standard CVBS signals

US5943101A · kind A · utility

4Cited by

5References

8Claims

0Family size

Assignee

Deutsche Thomson-Brandt GmbH · DE

Inventors

Gangolf Hirtz · Niedereschach, DE
Thomas Hollmann · Villingen-Schwenningen, DE
Michael Maier · Villingen-Schwenningen, DE

Key dates

Filing date	May 1, 1997
Grant date	Aug 24, 1999
Priority date	—
Expiry date	May 1, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH04N9/642
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.