Ultrasonic wireless pen position determination system and method
US6535206B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 2000 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Feb 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C21/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention in one embodiment provides a system and method for determining the position of an ultrasonic pen device, and for providing calculated position information to a computer system. The system of one embodiment comprises a first and second ultrasonic sensor that detect an ultrasonic signal emitted by an ultrasonic pen. The system further includes analog-to-digital converters to digitize the sensed ultrasonic signal and a processor to process the ultrasonic signal and determine the position of the ultrasonic pen.Some embodiments of the invention incorporate an algorithm that comprises calculating a first ultrasonic signal arrival time and calculating a second ultrasonic signal arrival time, and that further comprises using the first and second arrival times in calculating a final ultrasonic signal arrival time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.