Incremental encoder synchronous decode circuit

Details Incremental encoder synchronous decode circuit Incremental encoder synchronous decode circuit

1983-02-24

1985-12-10

Smith, Jr., David

Communications: electrical

Audible indication

Percussion-type sound producer

318661, H03K 1302

Patent

active

045583048

ABSTRACT:
A synchronous decode circuit for an incremental encoder is disclosed which comprises analog-to-digital converters for converting in phase and quadrature encoder signals to transistor-to-transistor logic (TTL) compatible signals, a latch for receiving current logic level signals and the previous logic level signals for a gray code, a programmable read only memory (PROM) for decoding the logic level signals and generating clock and direction enable signals, and gating logic connected to the PROM for gating clock and direction signals to counters of the system, the counters are connected to a latch under control of the computer to latch the count of movement in preselected directions for the computer. In another embodiment the PROM includes scaling jumper means or error detection means or both for, respectively, adjusting the range of measurement (scale factor) and indicating error in the logic level signals.

REFERENCES:
patent: 4079235 (1978-03-01), Froyd et al.
patent: 4282468 (1981-08-01), Barker et al.
patent: 4358723 (1982-11-01), Scholl et al.
patent: 4390865 (1983-06-01), Lauro
patent: 4490661 (1984-12-01), Brown et al.

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