Self-tuning digitizer control circuit and method

Details Self-tuning digitizer control circuit and method Self-tuning digitizer control circuit and method

1991-07-29

1993-03-02

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

051911752

ABSTRACT:
A self-tuning digitizer control circuit and method which employs a tunable excitation source instead of a tunable front end. In addition, the digitizer control circuit includes a stylus for sensing the excitation signal, and a circuit for processing the information signal from the stylus, including a narrow bandpass filter for passing the frequency of the excitation signal and minimizing the passage of extraneous noise. A controller determines the location of the stylus on the active surface of the digitizer and control operation of the circuit. The excitation source includes, in the preferred embodiment, a tunable divide-by-n circuit employing an 8-bit latch, an 8-bit counter, and a state machine. A nonvolatile memory stores the most recent value for the divisor value n. Provision is also made for a tuning method for the divide-by-n circuit.

REFERENCES:
patent: 4264903 (1981-04-01), Bigelow
patent: 4650296 (1987-03-01), Nakamura et al.
patent: 4698461 (1987-10-01), Meadows et al.
patent: 4853493 (1989-08-01), Schlosser et al.

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