Drive circuitry with error detection and compensating threshold

Details Drive circuitry with error detection and compensating threshold Drive circuitry with error detection and compensating threshold

1976-02-25

1977-04-26

Robinson, Thomas A.

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

040202933

ABSTRACT:
Apparatus for producing drive signals on any of several lines in response to input signals. Each of the lines has a drive circuit connected thereto. Resistances connected to the outputs of the drive circuits are connected together at a common juncture which acts as a summing point having a voltage proportional to the number of lines having drive signals thereon. First and second comparators are coupled to the common juncture and to threshold setting arrangements. The first comparator produces a signal if one or more of the lines has a drive signal and the second comparator produces a signal if two or more of the lines have signals. The outputs of the comparators are combined in alogic arrangement to produce an error signal if none of the lines has a signal or if two or more of the lines have signals. The threshold setting arrangements include a threshold setting drive circuit identical to the other drive circuits. The output of the threshold setting drive circuits is coupled to the comparators to provide reference voltages thereto. Conditions which cause variations in the signals from the drive circuits and consequently the voltage at the common juncture cause proportional variations in the output of the threshold setting drive circuit. Thus, a compensating arrangement is provided for adjusting the reference voltages to the comparators.

REFERENCES:
patent: 3720938 (1973-03-01), Leposavic
patent: 3940571 (1976-02-01), Ashley

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