System for processing position signals to improve resolution of

Details System for processing position signals to improve resolution of System for processing position signals to improve resolution of

1991-04-15

1993-06-08

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

34087035, 324227, G01B 714

Patent

active

052182959

ABSTRACT:
System for processing fine position signals pulse-width modulates signals from two magnetic sensors for producing sinusoidal wave signals different from each other in phase by a quarter cycle in correspondence with the scale pitches, then switches the phase so as to bring the pair of pulse-modulated signals in phase with each other, then calculates the weight constants for the pair of pulse-width modulated signals in phase in order that of said pair of pulse-width modulated signals in phase, any one having a higher linearity will be treated at a handsome rate, and then subjects said pulse-width modulated signals to weighted mean by the use of the resultant weight constants, with the result that the pair of pulse-width modulated signals will become free from disorder at the switching point, thereby producing signals of a high accuracy representing fine positions corresponding to the scale pitch divided at regular intervals.

REFERENCES:
patent: 4743786 (1988-05-01), Ichikawa et al.
patent: 4785242 (1988-11-01), Vaidya et al.
patent: 4833405 (1989-05-01), Richards et al.

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