Circuit for decoding chrominance signals in the Secam television

Details Circuit for decoding chrominance signals in the Secam television Circuit for decoding chrominance signals in the Secam television

1979-06-05

1981-06-02

Ng, Jin F.

Facsimile and static presentation processing

Static presentation processing

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358 23, H04N 940

Patent

active

042714273

ABSTRACT:
The invention relates to a circuit for decoding chrominance signals from the composite videofrequency signal in the Secam color television system. In order to direct each chrominance signal to the corresponding channel, it is proposed in accordance with the invention to extract the demodulated signals at the beginning of each line and to treat them in the first place by a controlled circuit which equalizes their d.c. voltages, in the second place by a color identification circuit which synchronizes the commutator with the television transmitter and in the third place by a "keeper" circuit for identifying the Secam process which inhibits the chrominance circuit if the transmission is by another process or parasitized. Application to television receivers using the Secam system.

REFERENCES:
patent: 4135201 (1979-01-01), Dickie et al.
Yoshino et al., "Chrominance Circuits for Secam Colour TV Receiver", National Technical Report, vol. 20, No. 6, pp. 786-800, Dec. 1974.

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