Data slicer circuit for separating and recovering digital telete

Details Data slicer circuit for separating and recovering digital telete Data slicer circuit for separating and recovering digital telete

1984-11-30

1987-04-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 13, H04N 7087

Patent

active

046565132

ABSTRACT:
A data slicer circuit for separating and recovering digital teletext signals from a demodulated composite color signal derives the slicing level by using a framing code detector and a gating pulse having an active phase during horizontal and color sync pulses. By an adder or a multiplier, a start value is formed at the beginning of each picture line. A square wave reference signal is formed which is subtracted from the start value containing composite color signal. From the difference signal, a digital automatic control system forms the slicing level.

REFERENCES:
patent: 4318128 (1982-03-01), Sauvanet

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