Communications: electrical – Digital comparator systems
Patent
1977-09-26
1978-12-05
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
358282, G06K 912
Patent
active
041288300
ABSTRACT:
The dark scan noise level produced from each of a solid state array of light sensors is obtained by preventing light from being received by each of the light sensors for a predetermined period of time. This signal is converted into a digital signal and stored in a shift register. When each of the light sensors of the array is subjected to light, the output signal produced thereby is reduced by the stored noise signal for the same light sensor. These output signals from the light sensors can be converted to digital signals and have the noise correction signals from the shift register subtracted therefrom by a digital subtractor, which is a complementary adder, or the digital noise correction signals from the shift register can be converted to analog signals and subtracted from the output signals of the light sensors of the array in an analog subtractor. The noise correction signals from the shift register are recirculated to the shift register during supply to the subtractor.
REFERENCES:
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patent: 3800078 (1974-03-01), Cochran et al.
patent: 3830972 (1974-08-01), McHugh et al.
patent: 3872434 (1975-03-01), Duvall et al.
patent: 3961132 (1976-06-01), Landsman
patent: 3962681 (1976-06-01), Requa et al.
patent: 4001500 (1977-01-01), Lavery et al.
patent: 4058828 (1977-11-01), Ladd
Boudreau Leo H.
International Business Machines - Corporation
Leach, Jr. Frank C.
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