Aperture correction signal processing circuit

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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H04N 514

Patent

active

042754178

ABSTRACT:
An aperture correction signal processing circuit includes first and second differential amplifiers, each consisting of first and second transistors. The respective first transistors of the first and second differential amplifiers are applied at respective base electrodes thereof with first and second aperture correction signals, which are opposite in phase to each other, while the base electrodes of the respective second transistors of the first and second differential amplifiers are connected to each other and fed with a variable bias voltage. The common electrodes of the first and second transistors of the first differential amplifier are connected to each other and further to a variable constant-current source, while the common electrodes of the first and second transistors of the second differential amplifier are connected to each other and further to a variable constant-current source, both of the above sources being simultaneously controllable. Thus, output signals from the first and second differential amplifiers are fed to the base electrode of a transistor for being added together to obtain an aperture correction signal free from noise at its emitter electrode.

REFERENCES:
patent: 3708753 (1973-01-01), Radecke

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