Method and device for enhancing accuracy in ultrasonic range measurement
US7724355B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2008 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Jul 4, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/043
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device (100) and method (300) for enhancing range detection accuracy in ultrasonic touchless sensing applications can include transmitting (302) an ultrasonic signal intended to reflect off a finger and produce an echo, receiving (304) the echo, saving (306) most recent echoes to a history (400), selectively discarding (308) echoes less recently saved in the history to produce a sparse history, identifying (310) a relative phase of the echo with respect to a previously received echo in the sparse history, tracking (312) a location and a movement of the finger from an arrival time of the echo and the relative phase, and providing (314) touchless control to a user interface control in accordance with the location and the movement of the finger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.