Video signal digital slicing circuit

Details Video signal digital slicing circuit Video signal digital slicing circuit

1990-10-02

1992-08-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358153, 307359, H04N 704, H04N 508

Patent

active

051363828

ABSTRACT:
An extractor for digital data transmitted at a first determined frequency (f0) through a video channel after a burst of 0s and 1s emitted at a first frequency (f0). A comparator (1) compares the input signal with a threshold level. A threshold level is provided by an up/down counter (12) operating at a frequency (F0) multiple of the first frequency, the up/down counting input of which is connected to the output of the comparator (1), and a digital/analog converter (16) receiving the output of the up/down counter and supplying the threshold level (V.sub.T).

REFERENCES:
patent: 4066878 (1978-01-01), Miller et al.
patent: 4318128 (1982-03-01), Sauvanet
patent: 4656513 (1987-04-01), Langenkamp
patent: 4667235 (1987-05-01), Nozoel et al.
patent: 4858067 (1989-08-01), Schweer et al.

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