Non-linear peaking system

Details Non-linear peaking system Non-linear peaking system

1983-03-07

1985-04-23

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, 330258, H04N 514

Patent

active

045133204

ABSTRACT:
A luminance peaking circuit includes a common and differential mode amplifier comprising a first differentially coupled pair of transistors coupled to a current source and functioning in a differential mode and a second differentially coupled pair of transistors functioning in a common mode. The bases of the second pair of transistors are connected together and to the base of one of the first pair of transistors. The inputs to the amplifier comprise a common mode signal and a differential mode signal and the outputs are matrixed to produce common mode signal components with opposite polarity differential mode components. The amplifier is characterized by a differential mode gain that is independent of common mode signal level and a common mode gain that is independent of differential signal level.

REFERENCES:
patent: 3353111 (1967-11-01), Van Wilson
patent: 4263616 (1981-04-01), Lee
patent: 4296435 (1981-10-01), d'Hautecourt et al.

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