Keyer with variable shaping

Details Keyer with variable shaping Keyer with variable shaping

1990-04-27

1991-09-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, 358174, H04N 553

Patent

active

050518283

ABSTRACT:
A keyer with variable shaping combines the benefits of a luminance keyer with those of a linear keyer using a single set of gain and clip controls. A key signal is input to a first amplifier having a high gain that is variable over an upper portion of a gain control signal's range. The output of the first amplifier is compared with a clip control signal and input to a second amplifier having a low gain that is variable over a lower portion of the gain control signal's range. The second amplifier includes a feedback circuit that provides minimum gain and shaping when the feedback signal is maximum, and provides maximum gain and shaping when the feedback signal is minimum.

REFERENCES:
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patent: 4206474 (1980-06-01), Hermann et al.
patent: 4506289 (1985-03-01), Shitakami
patent: 4620228 (1986-10-01), Mikado
patent: 4713695 (1987-12-01), Macheboeuf
patent: 4800432 (1989-01-01), Barnett et al.
patent: 4910592 (1990-03-01), Shroy, Jr. et al.
patent: 4920415 (1990-04-01), Chaplin
patent: 4947255 (1990-08-01), Jackson et al.
patent: 4967277 (1990-10-01), Chaplin
patent: 4970595 (1990-11-01), Bloomfield

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