Programmable comparator output filter

Details Programmable comparator output filter Programmable comparator output filter

1988-02-08

1989-08-29

Harkcom, Gary V.

Communications: electrical

Digital comparator systems

G06F 702

Patent

active

048621382

ABSTRACT:
A programmable counter or timer is preloaded with a value that serves to discriminate between meaningful transitions and spurious ones, and an output latch is initialized so that the value it contains is equal to the initial value of a comparator output. The binary output of the comparator is then continuously compared with the content of the output latch. If the two values become unequal, indicating a change in the state of the comparator output, the timer or counter is enabled to start timing or counting. If the change in the comparator output lasts long enough to qualify the transition as meaningful, the timer/counter times out clocking the new comparator output condition into the output latch.

REFERENCES:
patent: 3609683 (1971-09-01), Hoffman et al.
patent: 3753135 (1973-08-01), Kastner et al.
patent: 3790881 (1974-05-01), Smith
patent: 4191847 (1980-03-01), Mayer
patent: 4336593 (1982-06-01), Takase
patent: 4418332 (1983-11-01), Mefford
patent: 4775840 (1988-10-01), Ohmori et al.
Tektronix, 1240 Service Manual, Rev 1985, 4-63.fwdarw.4-66 and Schem 25.
Tektronix, 230 Service Manual, circa 1967, 4-48.fwdarw.4-49.

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