Automatic method for identifying a color TV standard

Details Automatic method for identifying a color TV standard Automatic method for identifying a color TV standard

1991-02-05

1993-03-09

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 11, H04N 327

Patent

active

051929970

ABSTRACT:
A method for automatically identifying the PAL or NTSC color TV standard comprises the following steps: providing a first demodulation signal (IC1) with the regenerated 90.degree.-phased sub-carrier; providing a second demodulation signal at the reference frequency of one of the colors (FOR) of the SECAM standard; providing a first voltage (VC1) by integrating the first demodulation signal (IC1), and providing a first associated logic criterion (C1), simultaneously applying the first signal (IC1) at the input of an inverter switched according to the rate of a non-half line-frequency phased signal (FL/2), providing a second voltage (VC2) by integrating the output signal (ICC) of the inverter (31), and providing a second associated logic criterion (C2); similarly providing, but from the second demodulation signal (IC2), the first logic criterion (C1) and the second logic criterion (C2); and identifying the standard received as a function of the state of the first and second logic criteria (C1 and C2).

REFERENCES:
patent: 4688082 (1987-08-01), Kato
patent: 5119177 (1992-06-01), Lim
8028 Electronic Components & Applications, "Single-Chip Multi-Standard Colour Decoder", Smaal, vol. 7, No. 1, 1985.

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