Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-11-26
1987-03-31
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358162, H04N 514
Patent
active
046547096
ABSTRACT:
The vertical contour correction device in accordance with the present invention comprises a first addition circuit for receiving a video signal from the video signal source as a first signal, for the purpose of combining a first signal and a second signal, a delay line connected with its input terminal to the output terminal of the first addition circuit, for taking out, at its output terminal, a signal supplied to its input terminal by delaying it by the duration of one horizontal scan, a subtraction circuit for mixing subtractively the signal obtained at the output terminal of the delay line and the first signal, a feedback network for supplying to the first addition circuit with the output signal of the subtraction circuit, as a second signal, by processing it to have a lower level and opposite polarity relative to the first signal, and a second addition circuit for taking out a video signal with preshoot and overshoot by mixing additively and at a prescribed ratio the signal obtained at the output terminal of the delaying means and the output signal of the subtraction circuit.
REFERENCES:
patent: 4047224 (1977-09-01), Yamagati
patent: 4481537 (1984-11-01), Tanaka
patent: 4558354 (1985-12-01), Tanaka
patent: 4588347 (1985-12-01), Pritchard
Britton Howard W.
Kabushiki Kaisha Toshiba
Kostak Victor R.
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