Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-03-02
1993-12-28
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358155, H04N 508
Patent
active
052744515
ABSTRACT:
A signal slicer of a sync separator includes a comparator for generating an output signal in accordance with a difference between a black level restored video signal and a slice level. The slice level is established dynamically, in accordance with the peak level of the sync pulse between the peak of the sync pulse and the black level. When the sync pulse occurs in the video signal, the output signal of the signal slicer assumes an active, first logical state; conversely, between consecutively occurring sync pulses, the output signal assumes an inactive, second logical state. The slice level is clamped to a predetermined level to prevent the occurrence of the first logical state when no video signal is received.
REFERENCES:
patent: 3639780 (1972-02-01), Lovelace
patent: 3699256 (1972-10-01), Roth
patent: 3869568 (1975-03-01), Ueda et al.
patent: 4185299 (1980-01-01), Harford
patent: 4313137 (1982-01-01), Weissmueller
patent: 4821098 (1989-04-01), Smeulers
A Technical Note & Appl., entitled TEA 2026 TV Scanning Monitor and Power Supply, in the name of Driessche, dated 1983, pp. 9-12.
A Technical Note entitled Sync Processor TDA 2595, dated prior to Nov. 1989, pp. 20-28.
Koblitz Karl R.
Rodriguez-Cavazos Enrique
Groody James J.
Henig Sammy S.
Laks Joseph J.
Lee Michael H.
Thomson Consumer Electronics Inc.
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