Gray code converter with error signal

Details Gray code converter with error signal Gray code converter with error signal

1989-02-08

1991-03-19

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from constant distance codes

341 94, 364740, H03M 716

Patent

active

050014790

ABSTRACT:
A method and circuit arrangement is disclosed for converting Gray code signals into counting pulses, forming a counter status, detecting interference signals infringing the Gray code and for forming an error signal with a network defining a finite automaton according to Moore or Mealy, wherein the network forms no error signal when a Gray code infringement is followed by a second Gray code infringement. The disclosed network arrangement in one embodiment comprises a quadruple interpolator (quadrature decoder) for precision dimension measuring machines with optoelectronic scale scanning. Interruptions of the measuring procedure and errors are reduced by not generating an error signal when a Gray code infringement is followed by a second Gray code infringement.

REFERENCES:
patent: 2632058 (1953-03-01), Gray
patent: 4876640 (1989-10-01), Shankar et al.
"Hewlett Packard, HCTL-2000 Technical Data", Apr. 1986, pp. 1-14.
Michael W. Butler, "Simplified Multiplier Improves Standard Shaft Encoder", Circuits and Software for Electrical Engineers, McGraw-Hill 1983, p. 86.
Kohavi, Z., "Switching and Finite Automata Theory", McGraw-Hill, New York, 1978, pp. 275-281, 322-325, 352-353.

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