Computer graphics processing and selective visual display system – Display peripheral interface input device – Mechanical control
Patent
1992-11-16
1995-01-31
Brier, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Mechanical control
G09G 500
Patent
active
053862201
ABSTRACT:
A digital display value adjusting device reliably determines the direction of rotation of a manual input member through a simple calculation for adjusting a digital display value. A plurality of pulse strings are generated by a pulse generator in accordance with the rotation of the manual input member. Pulse state data are generated and temporarily stored for each of the pulse strings. Through a calculation, the change in the state of the pulses is determined using the currently generated pulse state data and the stored pulse state data. The direction of rotation of the input member is determined on the basis of the result of the calculation. The direction of rotation of the input member is determined only when a change in state of a first generated pulse string is successively followed by a change in state of another generated pulse string before another change in state of the first generated pulse string occurs. The value of a digital display is adjusted in accordance with the detection results only when a change of state occurs successively in the generated pulse strings.
REFERENCES:
patent: 3319227 (1967-05-01), Evans, Jr.
patent: 4171540 (1979-10-01), Arnold
patent: 4549173 (1985-10-01), Nakamura
patent: 4568927 (1986-02-01), Fowler
Adams Bruce L.
Brier Jeffery
Seikosha Co. Ltd.
Wilks Van C.
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