Method of employing a chirographic stylus

Details Method of employing a chirographic stylus Method of employing a chirographic stylus

2004-06-24

2010-02-23

Strege, John B (Department: 2624)

Image analysis

Pattern recognition

On-line recognition of handwritten characters

C345S179000

Reexamination Certificate

active

07668375

ABSTRACT:
Disclosed herein is a chirographic signal pulse-emitting source and chirographic reader system. In an embodiment according to the present invention, contact-free proximity sensors may replace mechanical sensors. Ultrasonic transducers emit position-signaling pulses from a tip of the signal pulse-emitting source. Ultrasonic sensors on a reader typeface frame receive the pulses (transmissions). Proximity may be determined from the duration of travel of a pulse. Also disclosed herein is a reader subsystem including at least two separate modules. The at least two separate modules may include a pulse transmitting unit for a hand-held part and a stationary typeface frame reader sensing and receiving unit. The method may provide multiple triangulation measurements from a sensor arrangement to sense a multi-dimensional direction of the signal pulse-emitting source. The method may also provide pulse-width resolution by averaging multiple triangulation measurements for each signal pulse.

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