Circuit for doubling the number of output bits of a photodiode a

Details Circuit for doubling the number of output bits of a photodiode a Circuit for doubling the number of output bits of a photodiode a

1979-03-15

1980-12-02

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, 358262, 3401463AG, H04N 140, G06K 900

Patent

active

042374952

ABSTRACT:
A circuit for converting a series of photoelectric element array voltage outputs into twice the number of binary bits is described. Each photodiode output voltage is compared against two reference voltages to produce a two bit code word signifying a low, medium or high photodiode output. This is then operated on by a circuit implementation of a logic equation to produce a two bit serial output. The result is the frequency doubling of a photodiode array output for greater fidelity during transmission and reproduction of the original image.

REFERENCES:
T. E. Cassada and J. E. Garcia, Sep. 1973, "Facsimile Threshold with Background Control", IBM Technical Disclosure, vol. 16, No. 4.
M. L. Duff, "Gradient Detection System", IBM Technical Disclosure, vol. 18, No. 12, May 1976.

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