Integrated circuit for digitizer table with dedicated digital signal processor for improved noise immunity
US5359156A · kind A · utility
23Cited by
7References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1992 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Nov 18, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0442
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital tablet of the type that multiplexes pen position signals has filtering and digitizing circuits arranged in separate channels for each of the signals that is to be multiplexed. The tablet pen is connected to receive an oscillator signal and the signal is picked up at each of the four corners of the tablet and applied to the corresponding channel. The separate channels permit the filters to be made sharper. The disclosure also includes improved circuits for processing the pen position signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.