Independent channel automatic gain control for self-scanning pho

Details Independent channel automatic gain control for self-scanning pho Independent channel automatic gain control for self-scanning pho

1977-11-25

1979-06-05

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

250567, 358174, G06K 912

Patent

active

041575334

ABSTRACT:
A scanned photocell array has the gain for each photocell channel automatically controlled by establishing a scale range based upon the media being scanned. The apparent gain of each cell is varied by modulating the reference input of an analog to digital converter at the photocell scan rate.

REFERENCES:
patent: 3568151 (1971-03-01), Majima
patent: 3800078 (1974-03-01), Cochran et al.
patent: 3872434 (1975-03-01), Duvall et al.
patent: 3918049 (1975-11-01), Snyder et al.
patent: 3962681 (1976-06-01), Requa et al.
patent: 4064484 (1977-12-01), Mese et al.
patent: 4128830 (1978-12-01), Weythman
patent: 4129853 (1978-12-01), Althauser et al.

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