Two-phase encoder circuit

Details Two-phase encoder circuit Two-phase encoder circuit

1988-10-21

1990-07-03

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Including reversible counter

377 55, 324165, 340672, H03K 2102

Patent

active

049397567

ABSTRACT:
A two-phase encoder circuit for detecting a moving status of a moving article in accordance with first and second detecting signals which are input having a phase offset of 90 degrees and having repeated status of "H" and "L" according to the movement of said moving article, wherein the first detecting signal is taken in synchronization with a clock signal and an output received signal is sequentially output while a delay circuit having an input from at least the received signal outputs a delay signal more delayed than the received signal by less than one period of the clock signal, a pulse signal circuit having an input from at least the received signal outputs, a pulse signal in synchronization with an inversion of status of the received signal and the number of pulses of the pulse signal is counted while counted up or down according to the status of the delay signal with the counting operation being made when the second detecting signal has one status of ""H" and "L".

REFERENCES:
patent: 3943338 (1976-03-01), Gagniere
patent: 4081661 (1978-03-01), Durbin
patent: 4142152 (1979-02-01), Fincher
patent: 4266215 (1981-05-01), Adams

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