Method and apparatus for a touch sensitive system employing direct sequence spread spectrum (DSSS) technology
US7084860B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2002 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Aug 24, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0433
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch sensing apparatus for receiving input from one or more touch stimulating devices employs a direct sequence spread spectrum (DSSS) signaling arrangement to transmit signals from the touch stimulating devices for identification and location determination. Active devices are powered by an EM field and generate a touch stimulating signal that is spread spectrum encoded for identification, and signal pickups in a propagation layer receive the touch stimulation signals which are identified by the DSSS encoding and located using received signal strength (RSS) techniques. Semi-active devices are powered by an EM field and receive code instructions to generate specific spread spectrum signals and generate a touch-stimulating signal. Touch stimulating devices are either tethered or tether-free, and powered by batteries or EM fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.