Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Identifying or correcting improper counter operation
Patent
1980-08-19
1983-11-08
Miller, Stanley D.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Identifying or correcting improper counter operation
377 45, 328133, 34082517, H04B 304, H03K 906
Patent
active
044146787
ABSTRACT:
An electronic up-down counter system including a directional discriminator for accepting input pulses and for generating sequences of pulses which represent up-count and down-count signals. The count signals are applied to a reversible up-down counter having separate inputs for up-count pulses and down-count pulses. The directional discriminator is embodied in a read-only memory (ROM), which accepts the source input pulses to be counted and several inputs having predetermined phase relationships with the source pulse train. The ROM determines from the phase relation whether the count is up or down and generates the appropriate output pulse sequence for application to the reversible up-down counter. The ROM may be logically adapted to be sensitive to a change in sign when the up-down counter passes through a "zero" count.
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Davis B. P.
Dr. Johannes Heidenhain GmbH
Miller Stanley D.
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