Apparatus for indicating the value of a variable

Details Apparatus for indicating the value of a variable Apparatus for indicating the value of a variable

1987-09-23

1989-04-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

048230006

ABSTRACT:
In a position encoder an interpolator derives from quadrature input signals a series of sine waves equispaced in phase. These are applied to respective comparators which output a binary zero or a binary one according to whether the respective sine wave is above or below the zero crossing point. Interpolation is achieved by identifying an adjacent pair of said sine waves of which one has a value above and the other a value below zero and a counter stores a number indicative of this pair of signals.

REFERENCES:
patent: 4346447 (1982-08-01), Takahama
patent: 4445110 (1984-04-01), Breslow
patent: 4630928 (1986-12-01), Klingler et al.

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