Digital data slicer circuit for digital teletext signals

Details Digital data slicer circuit for digital teletext signals Digital data slicer circuit for digital teletext signals

1988-09-06

1989-08-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 358146, H04N 7087, H04N 708

Patent

active

048580074

ABSTRACT:
A digital data slicer circuit causes the slicing level to track a teletext signal in optimum fashion even if the teletext signal has many successive zero crossings. The digital data slicer circuit substantially prevents any lock-in in either of two other, stable states. This is achieved essentially by applying a zero signal via two changeover switches to an accumulator and a sign inverter when many successive zero crossings are detected by a logic circuit that controls the changeover switches.

REFERENCES:
patent: 4620227 (1986-10-01), Levin et al.
patent: 4697211 (1987-09-01), Balaban et al.
patent: 4712131 (1987-12-01), Tanabe

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