Pen transcription system utilizing a spatial filter for limiting interference
US8324517B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2009 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Jun 9, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03545
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pen transcription system and method for locating a moveable signal source are disclosed. The transcription system includes a base having a planar base surface, first and second acoustical sensors that detect an acoustical signal emitted by a moveable signal source, the acoustical sensors being mounted on the base and separated from one another. The difference in time of detection between an EM signal and the acoustical signals is measured to determine the position of the moveable source. The acoustical sensors include a housing surrounding a detector. The housing has an aperture having a width that is less than the wavelength of said acoustical signal divided by 6.28 and a height that is substantially equal to an integer multiple of a wavelength of an interfering acoustical signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.