Circuit arrangement for identifying the transmission standard of

Details Circuit arrangement for identifying the transmission standard of Circuit arrangement for identifying the transmission standard of

1991-04-12

1992-08-04

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 17, 358 19, 358 23, H04N 546, H04N 1122

Patent

active

051363690

ABSTRACT:
A circuit arrangement for identifying the transmission standard of a color television signal, having a chrominance subcarrier upon which chrominance information is modulated and color synchronising pulses, includes circuitry (14, 21, 24, 25) for determining the frequency of the chrominance subcarrier which, in those cases in which a given standard of the color television signal can unambiguously be concluded from the determined chrominance subcarrier frequency of the color television signal to be decoded, the decoder is immediately switched to the decoding of this signal of this standard, and in addition includes circuitry (23, 22) which determine the vertical deflection frequency of the television signal and ascertain whether the chrominance subcarrier has a line-sequentially alternating phase, and that in those cases in which the determined chrominance subcarrier frequency cannot unambiguously be assigned to a given standard, these information components are also used for identifying the standard of the color television signal to be decoded and for adjusting the decoder to this standard, in addition to the chrominance subcarrier frequency.

REFERENCES:
patent: 4897713 (1990-01-01), Nilleson
patent: 4970581 (1990-11-01), O'Gwyn

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