Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1996-05-21
1998-12-01
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327205, H03K 3037, H03K 5153
Patent
active
058444300
ABSTRACT:
An apparatus and method for controlling a variable threshold signal conditioning circuit to condition a variable amplitude periodic input signal in response to the control signals received. A plurality of transistor circuits, each responsive to a control signal, are disposed in parallel with the positive feedback resistor of a trigger circuit. The transistor circuits are controlled to adjust the upper threshold levels of the trigger circuit in order to reduce the false triggering effects of noise in the input signal. The lower threshold level is held constant at the input signal mid-line voltage while the upper threshold level is varied over a plurality of preprogrammed values. A microprocessor determines the appropriate threshold level for the circuit by comparing the timing signal output of the signal conditioning circuit to preprogrammed values stored in the microprocessor memory.
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Streicher Ernest A.
Thurnau Edwin M.
Wilhelm Daniel D.
Cummins Engine Company, Inc.
Tran Toan
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