Apparatus and Method for Detecting Finger Activity on a Fingerprint Sensor
First Claim
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1. A method for detecting the presence of a finger on a fingerprint sensor, the method comprising:
- transmitting a probing signal to a fingerprint sensing area, the probing signal comprising a series of probing pulses;
receiving a response signal from the fingerprint sensing area in response to the probing signal, the response signal comprising a series of response pulses;
establishing an upper reference signal; and
monitoring whether the peaks of the response pulses exceed the upper reference signal.
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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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Citations
29 Claims
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1. A method for detecting the presence of a finger on a fingerprint sensor, the method comprising:
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transmitting a probing signal to a fingerprint sensing area, the probing signal comprising a series of probing pulses; receiving a response signal from the fingerprint sensing area in response to the probing signal, the response signal comprising a series of response pulses; establishing an upper reference signal; and monitoring whether the peaks of the response pulses exceed the upper reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for detecting the presence of a finger on a fingerprint sensor, the apparatus comprising:
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a transmitter element to emit a probing signal at a fingerprint sensing area, the probing signal comprising a series of probing pulses; a receiving element to receive a response signal from the fingerprint sensing area in response to the probing signal, the response signal comprising a series of response pulses; a first signal generator to generate an upper reference signal; and a detector to monitor whether the peaks of the response pulses exceed the upper reference signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for detecting the presence of a finger on a fingerprint sensor, the apparatus comprising:
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means for transmitting a probing signal to a fingerprint sensing area, the probing signal comprising a series of probing pulses; means for receiving a response signal from the fingerprint sensing area in response to the probing signal, the response signal comprising a series of response pulses; means for establishing an upper reference signal; and means for monitoring whether the peaks of the response pulses exceed the upper reference signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification