Apparatus and method for detecting finger activity on a fingerprint sensor
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United States of America Patent
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Oct 2, 2012
Grant Date -
Jul 15, 2010
app pub date -
Jan 15, 2009
filing date -
Jan 15, 2009
priority date (Note) -
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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.
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