INFO 1 detection

Details INFO 1 detection INFO 1 detection

1986-07-28

1988-09-13

Harkcom, Gary V.

Communications: electrical

Digital comparator systems

36471511, G06F 702

Patent

active

047712643

ABSTRACT:
Method of detecting the INFO 1 signal pattern which avoids false activation of a data transmission line caused by noise on the line. An initial line sampling rate four times the nominal 192 kbs line rate is used to detect a HIGH mark to avoid the difficulties resulting from sampling right at the edge of a mark. Subsequent sampling is done at the nominal line rate to detect two opposite polarity marks out of every consecutive eight-bit time periods. If six consecutive eight-bit time periods are detected, each having its HIGH and LOW marks in the same relative positions, the line is activated. The method is readily implemented as a set of three "state machines" and consequently can be constructed from programmable logic arrays.

REFERENCES:
patent: 3760355 (1973-09-01), Bruckert
patent: 3832685 (1974-08-01), Hendrickson
patent: 3855576 (1974-12-01), Braun et al.
patent: 4414676 (1983-11-01), Kraul et al.
patent: 4513419 (1985-04-01), Small
patent: 4611336 (1986-09-01), Fryer
patent: 4697276 (1987-09-01), Skoog

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