Pointing device with reduced component count

Details Pointing device with reduced component count Pointing device with reduced component count

1996-08-30

1999-02-23

Saras, Steven J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

345157, 345158, 345159, 345160, 345161, 345162, 345163, 345164, 345165, 345166, 345167, 341144, 341145, 704271, G09G 500, H03M 166

Patent

active

058749381

ABSTRACT:
A signal processing system for a strain-gauge pointing device has a reduced parts count and permits the use of relatively inexpensive low-tolerance components. The system can process signals from two or three or more strain gauges, permitting additional inputs by users without a linear increase in the number of signal processing components. The system employs an RC network to develop an offset for the signal to be provided to an analog-to-digital converter. The system performs each measurement twice, once with a particular excitation polarity and again with the opposite excitation polarity, which permits correction for drift and temperature instability.

REFERENCES:
patent: 4550316 (1985-10-01), Whetstone et al.
patent: 5442729 (1995-08-01), Kramer et al.
patent: 5608401 (1997-03-01), Viswanathan et al.
patent: 5680154 (1997-10-01), Shiga et al.
patent: 5696535 (1997-12-01), Rutledge et al.

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