Transducer signal waveshaping system
US6118205A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1998 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Aug 13, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03545
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A transducer signal waveshaping system is provided, in which a signal excitation circuit includes a non-linear device. The resulting circuit produces a short input pulse, which allows a piezoelectric transducer to transmit a shortened output signal having distinct waveshape characteristics. The resulting waveshaped output signal, typically an ultrasonic signal, provides a measurable time-dependent signal that is particularly suited for data entry systems, such as for movable transmitter pens and white boards. The location of the transmitter pen in relation to the writing area of a white board can be determined, using the periodic transmission of the waveshaped output signals. Alternative embodiments include additional circuit elements, which allow the resulting waveshaped output signal to include even more distinctive waveform features. The distinctive waveform features allow the transmitter pen to be located even more accurately, and provide a means for transferring supplementary information, such as pen up vs. pen down distinction, and determined pen characteristics, such as pen color, pen line width, and pen user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.