Amplifier background control apparatus for use in a document...

Details Amplifier background control apparatus for use in a document... Amplifier background control apparatus for use in a document...

H - Electricity

04

N

350/17

H04N 1/10 (2006.01) H04N 1/403 (2006.01) H04N 1/407 (2006.01)

Patent

CA 1048140

AMPLIFIER BACKGROUND CONTROL APPARATUS FOR USE IN A DOCUMENT SCANNING SYSTEM ABSTRACT OF THE DISCLOSURE An arrangement for use in a document scanning system to provide background control of signals representative of the information content of a scanned document. An amplifier includes an automatic background control portion and an automatic black level adjustment portion to maintain the integrity of the output voltage range independent of the background of the scanned docu- ment and throughout the period of time required to scan the entire document. In addition, circuitry is provided for varying the time constant of the automatic background control circuitry to make that circuitry respond quickly to changes of the back- ground toward the "white" direction. Further, the normally white platen back at the scanning station is provided with a gray leading edge to prevent the automatic background control circuitry from being upset by initial runs of white in the event of an imperfectly registered non-white document.

238512

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