Apparatus and method for detecting finger activity on a fingerprint sensor
US8278946B2 · kind B2 · utility
31Cited by
159References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2009 |
| Grant date | Oct 2, 2012 |
| Priority date | — |
| Expiry date | Dec 12, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1335
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for detecting the presence of a finger on a fingerprint sensor is disclosed in one embodiment of the invention as including transmitting a probing signal, comprising a series of probing pulses, to a fingerprint sensing area. A response signal, comprising a series of response pulses, is received from the fingerprint sensing area in response to the probing signal. An upper reference signal is generated and finger activity is detected on the fingerprint sensing area by monitoring whether the peaks of the response pulses exceed the reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.