SECAM Identification system

Details SECAM Identification system SECAM Identification system

1981-04-24

1982-11-02

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 947

Patent

active

043576230

ABSTRACT:
Color TV receiver subject to reception of SECAM signals incorporates dual-mode identification system for identifying and correcting an incorrect mode of line-by-line switching in SECAM demodulation apparatus. In one (horizontal) mode of operation, identification information is derived from lead-in bursts preceding image signals during active line intervals; in other (vertical) mode of operation, identification information is derived from identification oscillations present during selected line periods within vertical blanking interval. Single FM detector and pair of sample-and-hold circuits responsive to detector output are used in both modes of operation, with mode selection sensitive control signal generators developing detector center frequency tuning control, detector gain control, and sampling control waves of forms dependent on mode selected. Mode selection signal, to which control signal generators respond, comprises vertical blanking waveform with DC component of one magnitude when vertical identification mode is desired, and DC component of a different magnitude when horizontal identification mode is desired.

REFERENCES:
patent: 3336437 (1967-08-01), Brouard et al.
patent: 3553357 (1971-01-01), Carnt
patent: 3877066 (1975-04-01), van Gils
patent: 4240102 (1980-12-01), Groeneweg

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