Threshold device for distinguishing the white level from the bla

Details Threshold device for distinguishing the white level from the bla Threshold device for distinguishing the white level from the bla

1979-09-10

1980-11-18

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

307358, G06K 938, H03K 5153

Patent

active

042348676

ABSTRACT:
The threshold device comprises a comparator for comparing the input signal with a threshold voltage and delivering an output signal having a first level when the level of the input signal is a white level and a second level when the level of the input signal is a black level. Storage means memorize the value of the level of the input signal when the level of the output signal of the comparator corresponds to a white level. Said storage means deliver a voltage which is representative of a fraction of the value of the stored input signal level and which constitutes the threshold voltage.

REFERENCES:
patent: 3321637 (1967-05-01), Beltz et al.
patent: 3599151 (1971-08-01), Harr
patent: 3715724 (1973-02-01), Demonte et al.
patent: 3973239 (1976-08-01), Kakumoto et al.
patent: 4003021 (1977-01-01), Sasaki et al.
patent: 4078227 (1978-03-01), Fahey et al.
patent: 4159432 (1979-06-01), Burke et al.
patent: 4162408 (1979-07-01), Hansen

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