Signal preprocessing circuit of a line sensor

Details Signal preprocessing circuit of a line sensor Signal preprocessing circuit of a line sensor

1988-05-27

1989-09-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358471, H04N 140

Patent

active

048686859

ABSTRACT:
A preprocessing circuit of a line sensor which includes a plurality of photoelectric elements arranged in the form of a single array and divided into a plurality of blocks is provided. The preprocessing circuit includes a differential input/differential output preamplifier having a pair of input terminals and a pair of output terminals. A pair of read output data is collected by the preamplifier from a pair of photoelectric elements which are located substantially symmetrically with respect to the center of the line sensor while the line sensor is being scanned electronically. A pair of outputs from the preamplifier is selected such that there remain an output signal of a predetermined polarity. And, a peak value of the output of a predetermined polarity is sampled and held and it is adjusted in accordance with a dark level correction data stored in a memory for each of the photoelectric elements. The memory also stores a gain correction data for each of the photoelectric elements, which is used for correcting the gain of the output signal. Then, the output signal is converted into a digital signal.

REFERENCES:
patent: 4741046 (1988-04-01), Matsunawa et al.
patent: 4760464 (1988-07-01), Sakano
patent: 4772958 (1988-09-01), Suzuki
patent: 4812667 (1989-03-01), Kobayashi et al.

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