Zero crossing noise-rejecting digital filter

Details Zero crossing noise-rejecting digital filter Zero crossing noise-rejecting digital filter

1987-12-14

1989-01-03

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307354, 307518, 328150, H03K 5153

Patent

active

047959150

ABSTRACT:
For use with a reluctance sensor, a digital detector (200) accurately detects, in the presence of noise, a valid transition in the sensor's output signal (10, 202). A first flip-flop (216) is used for sensing a positive going edge (310, 334A) in the sensor signal and for providing an inhibit pulse (312, 332, 336) of a first predetermined time period in response thereto. A second flip-flop (218) responds to the end of the inhibit pulse, if the sensor signal is in the high logic state, by sensing a subsequent negative going edge (318, 334B) in the sensor signal. If the negative going edge is sensed, the digital detector indicates that a valid transition in the sensor signal occurred.

REFERENCES:
patent: 3718864 (1973-02-01), Kelly et al.
patent: 3735271 (1973-05-01), Leibowitz
patent: 4104997 (1978-08-01), Padgitt
patent: 4110698 (1978-08-01), Petrie
patent: 4137504 (1979-01-01), Simmons
patent: 4244376 (1981-01-01), Fisher et al.
patent: 4414534 (1983-11-01), Whidden
patent: 4742248 (1988-05-01), Smith et al.

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