Framing code detector for a teletext receiver

Details Framing code detector for a teletext receiver Framing code detector for a teletext receiver

1984-09-24

1987-01-20

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

370 41, 370106, 358264, H04L 708, H04J 306, H04N 136

Patent

active

046384979

ABSTRACT:
A framing code detector includes a shift register supplied with a received framing code and a number of EX-OR gates each having one input connected to a respective stage of the shift register and another input which is supplied with a respective bit of a stored pattern having the inverted form of the anticipated framing code to be received/ a counter is provided for counting the number of times all outputs of EX-OR gates become "1" during a predetermined period, and an identification signal is produced when the count value of the counter is greater than a predetermined value.

REFERENCES:
patent: 3597539 (1971-08-01), Clark
patent: 3800086 (1974-03-01), Lyons, Jr. et al.
patent: 4065639 (1977-12-01), Suzuki et al.
patent: 4214124 (1980-07-01), Jarus
patent: 4340962 (1982-07-01), Wintzer et al.
patent: 4389636 (1983-06-01), Riddle, Jr.

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