Digital phase decoding technique for quadrature phased signals

Details Digital phase decoding technique for quadrature phased signals Digital phase decoding technique for quadrature phased signals

1978-03-16

1980-09-02

Heyman, John S.

328151, 328166, 328133, H03K 1300

Patent

active

042209242

ABSTRACT:
A phase decoding technique is provided which, when applied to a pair of quadrature-phased digital-electronic signals (i.e. having a 90.degree. phase relationship) such as those normally associated with incremental optical position encoders, produces signals suitable for incrementing or decrementing up-down counters in accordance with the phase relationship and pulse rate of these quadrature phased signals. This is accomplished through circuitry which is entirely of a digital nature and relys on comparisons of samples of the quadrature-phased signals which are taken and stored in a time-sequential manner. Since no analog circuitry is employed, the disadvantages of phase decoders using prior art techniques are avoided.

REFERENCES:
patent: 3671871 (1972-06-01), Malm
patent: 3710265 (1973-01-01), Gray
patent: 4037116 (1977-07-01), Hodama

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