Method and apparatus for reducing crosstalk effects upon phase m

Details Method and apparatus for reducing crosstalk effects upon phase m Method and apparatus for reducing crosstalk effects upon phase m

1985-08-26

1987-04-21

Miska, Vit W.

Communications: electrical

Audible indication

Percussion-type sound producer

G04C 906

Patent

active

046600213

ABSTRACT:
A phase measurement between two signals is performed by beginning on an arbitrary zero crossing of the signal from the reference stator and forming, for each rotor, the sum of the times for the zero crossings for one complete revolution. To avoid the effects of crosstalk the rotors may have different numbers of poles. The sums, the different numbers of poles, the time for one revolution, and, for each rotor, the number of poles from the pole corresponding to the first term in the associated sum to an absolute reference pole, are the variables in a phase formula producing a high accuracy and resolution unified answer free of separate coarse and fine components. The absolute reference poles may be missing poles whose absence is detected and replaced with an estimate.

REFERENCES:
patent: 2901170 (1959-08-01), Poole
patent: 4064504 (1977-12-01), Lepetit
patent: 4190799 (1980-02-01), Miller et al.
patent: 4388656 (1983-06-01), Lemke

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