Displacement detecting apparatus

Details Displacement detecting apparatus Displacement detecting apparatus

1997-09-03

2000-02-29

Pham, Chi H.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375324, 3647241, H04L 700, H04L 2536, H04L 2540

Patent

active

060318856

ABSTRACT:
A displacement detecting apparatus outputs a displacement information signal obtained by interpolating a phase modulation. A direction block obtains a direction signal indicative whether the cycle of the phase modulation signal is longer than the cycle of the reference signal. A phase difference block obtains the number of the interpolation clock pulses which number corresponds to a phase difference between the phase modulation signal and the reference signal. An up/down counter counts to an interpolation number upon receiving the direction signal and a pulse train corresponding to the phase difference. The presetting block presets the number of pulses corresponding to the phase difference in the up/down counter. The displacement information block outputs a Glay code converted from continuous 2 bits of the count value of the up/down counter as displacement information.

REFERENCES:
patent: 5299143 (1994-03-01), Hellinga et al.
patent: 5309484 (1994-05-01), McLane et al.
patent: 5339030 (1994-08-01), Hayashi
patent: 5365468 (1994-11-01), Kakubo et al.
patent: 5511091 (1996-04-01), Saito
patent: 5515403 (1996-05-01), Sloan et al.
patent: 5535252 (1996-07-01), Kobayashi

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