Method and circuit arrangement for distinguishing between standa

Details Method and circuit arrangement for distinguishing between standa Method and circuit arrangement for distinguishing between standa

1997-05-01

1999-08-24

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Including nonstandard signal detection controlling processing

348558, H04N 546

Patent

active

059431016

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.

REFERENCES:
patent: 4860089 (1989-08-01), Smith
patent: 4860090 (1989-08-01), Murata et al.
patent: 4985757 (1991-01-01), Yasuki et al.
patent: 5111160 (1992-05-01), Hershberger
patent: 5192997 (1993-03-01), Imbert et al.

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