Discrimination circuit arrangements

Details Discrimination circuit arrangements Discrimination circuit arrangements

1977-05-06

1979-05-15

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, 356431, G01N 2132

Patent

active

041550129

ABSTRACT:
A discrimination circuit operable to discriminate between an input signal in the form of a pedestal and disturbance signals superimposed thereon has an A-D converter to digitize a disturbance-free reference pedestal signal, circulating shift register to store the digitized reference signal, a D-A converter to produce a pedestal signal from the reference signal, a controlling clock to shift the reference signal in the store in synchronism with the incoming signal such that the two pedestal signals are available together, and a comparator to compare the reference signal with the input signal to produce an output caused by differences due to disturbances. The circuit forms part of an optical surface inspection apparatus.

REFERENCES:
patent: 3348065 (1967-10-01), Schmidt
patent: 3804979 (1974-04-01), Knowles
patent: 3812373 (1974-05-01), Hosoe et al.
patent: 3843890 (1974-10-01), Anthony, Jr. et al.
patent: 4008405 (1977-02-01), Neumann et al.

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