Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-02-24
1994-01-25
Powell, Mark R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358242, 330258, H04N 514, H04N 568
Patent
active
052820394
ABSTRACT:
An amplifier includes amplifier transistor (3) whose collector is connected to a load impedance (12) which is a current generator and includes a device for controlling the current as a function of the voltage level at the collector (20) of the amplifier transistor, which control acts in such a way that the current decreases when the voltage increases with a time constant which is of the order of the field retrace period. The amplifier transistor (3) is of the NPN type and the power supply is positive, while the current generator is a PNP transistor (7) whose base is connected to the collector of the amplifier transistor (3) via a resistor (4).
REFERENCES:
patent: 4035840 (1977-07-01), Teuling
patent: 4118731 (1978-10-01), Hinn
patent: 4197558 (1980-04-01), Rutishauser
patent: 4224640 (1980-09-01), Hovens et al.
patent: 4293875 (1981-10-01), Katz
patent: 4471322 (1984-09-01), Yamaguchi et al.
patent: 4727336 (1988-02-01), Mark
patent: 4999586 (1991-03-01), Meyer et al.
Goodman Edward W.
Miller John W.
Powell Mark R.
U.S. Philips Corporation
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