Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-09-08
1993-08-31
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358172, H04N 521
Patent
active
052413888
ABSTRACT:
A video signal filtering circuit and method includes the operative steps of eceiving unfiltered high-state and low-state components of a video signal being substantially equally injected with electromagnetic noise, subtracting the unfiltered high-state and low-state components of the video signal one from the other so as to thereby produce a first signal having a DC offset component and an AC data-containing component free of noise, removing the DC offset component from the first signal and passing the noise-free AC data-containing component, clamping the first signal to a preset DC reference level corresponding to a specified sync level of a standard video signal so as to thereby produce a second signal having the AC data-containing component free of noise and being clamped to the preset DC reference level, and isolating the second signal from external electronic disturbances so as to produce a noise-free AC data-containing reference level-clamped output signal for providing a filtered high-state component having syncs stabilized to the specified sync level of the standard video signal to replace the original unfiltered noise-injected high-state component of the video signal.
REFERENCES:
patent: 3851260 (1974-10-01), Colin
patent: 4220926 (1980-09-01), Buckner
patent: 4374362 (1983-02-01), Sutherland et al.
patent: 4891704 (1990-01-01), Vonk et al.
deLuiter Larry F.
Fretz William J.
Schofield Ronald D.
Flynn Nathan J.
Forrest, Jr. John L.
Gilbert Harvey A.
Kostak Victor R.
Sliwka Melvin J.
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