Drive circuitry with error detection

Details Drive circuitry with error detection Drive circuitry with error detection

1974-11-04

1976-02-24

Claffy, Kathleen H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3401461AB, 340166R, H04M 300, G06F 1108

Patent

active

039405710

ABSTRACT:
Apparatus is disclosed for sensing and determining whether or not exactly a predetermined proper number (N) of lines, part of a larger number of lines (M) are being driven, i.e., an "N of M Detector." It includes resistances connected to each of the lines, and connected together at a common summing point juncture, whose voltage is proportional to the number of lines being driven. The summing point is sensed by two comparators ("greater than" and "less than") followed by Exclusive Or logic which can deliver a "Not Exactly N" error signal. Also disclosed therewith is a transistor crosspoint switching array circuit.

REFERENCES:
patent: 2900620 (1959-08-01), Johnson
patent: 3582892 (1971-06-01), Juliusberger
patent: 3633180 (1972-01-01), Pabst
patent: 3660826 (1972-05-01), Lins
patent: 3722107 (1973-03-01), Muller
patent: 3744024 (1973-07-01), Russel
patent: 3826873 (1974-07-01), Susi
patent: 3838277 (1974-09-01), Danielsen
patent: 3851307 (1974-11-01), Rivas

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