Coded data generation or conversion – Phase or time of phase change
Patent
1997-10-14
1999-05-25
Williams, Howard L.
Coded data generation or conversion
Phase or time of phase change
341116, 318602, G01D 500
Patent
active
059072989
ABSTRACT:
An interpolation circuit of an encoder of which dynamic accuracy is improved is disclosed. The phase angle data detecting circuit 1 detects to store the phase angle data PH for each of the first clock CK1. The phase angle data PH is input to the updating circuit 2 in which the current data CNT is subtracted from the subsequent phase angle data PH so as to be updated. The differential data DX is limited within an upper limit to be added to the current data CNT. The integrating circuit 3 integrates the differential data DELTA1, whose upper limit is predetermined, by the second clock CK2 to generate the carry signal QUADEN at each timing when the integrated value leads to the period ratio of CK1 to CK2. The two-phase square wave generating circuit 5 generates two-phase square wave signals at each timing of the carry signal QUADEN. The over-speed detecting circuit 6 monitors the differential data DX to generate the over-speed alarm signal OSALM under a predetermined condition.
REFERENCES:
patent: 3623072 (1971-11-01), Pohlman et al.
patent: 4164729 (1979-08-01), Simon et al.
patent: 4375636 (1983-03-01), Stack et al.
patent: 5650779 (1997-07-01), Sugden
Kiriyama Tetsuro
Teraguchi Mikiya
Jean-Pierre Peguy
Mitutoyo Corporation
Williams Howard L.
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