Facsimile transmitter having improved response

Details Facsimile transmitter having improved response Facsimile transmitter having improved response

H - Electricity

04

N

350/15

H04N 1/02 (1980.01)

Patent

CA 1101538

ABSTRACT OF THE DISCLOSURE A facsimile transmitter detects dark-light variations in an illuminated document by means of a photodetector. Fiber optics form an optical pathe from the illuminating means to the document and from the document to the photodetector means with filter means being located in the optical path for attenuating light in the near infrared region of the spectrum. Amplifier means are coupled to the photodetector means and automatic gain control means are associated with the amplifier means for increasing the gain of the amplifier in response to a lesser amount of light detected by the photodetector. The gain control means is adjustable so as to limit the increase in gain when detecting dark regions. Lead networks are coupled to the amplifier means to increase the speed of response to dark- light variations in the document.

356439

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