Portable electronic device having self-calibrating proximity sensors
First Claim
1. A method of a portable electronic device for self-calibration of a proximity sensor, the method comprising:
- obtaining a background measurement by the proximity sensor, wherein the background measurement is a measure of a received signal when no signal is transmitted by the proximity sensor;
adjusting a detection threshold of the proximity sensor based on the background measurement, the detection threshold associated with a sensitivity of the proximity sensor to environmental conditions;
emitting a source signal by the proximity sensor based on the adjusted detection threshold of the proximity sensor; and
receiving a return signal by the proximity sensor corresponding to the source signal.
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Abstract
A method of a portable electronic device for self-calibration of a proximity sensor. A background measurement is obtained by the proximity sensor and a detection threshold of the proximity sensor is adjusted based on the background measurement. The background measurement is a measure of a received signal when no signal is transmitted by the proximity sensor, and the detection threshold is associated with a sensitivity of the proximity sensor to environmental conditions. A source signal is emitted by the proximity sensor based on the adjusted detection threshold of the proximity sensor, and a return signal is received by the proximity sensor corresponding to the source signal. A function of the portable electronic device may be performed base don the received return signal.
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Citations
14 Claims
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1. A method of a portable electronic device for self-calibration of a proximity sensor, the method comprising:
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obtaining a background measurement by the proximity sensor, wherein the background measurement is a measure of a received signal when no signal is transmitted by the proximity sensor; adjusting a detection threshold of the proximity sensor based on the background measurement, the detection threshold associated with a sensitivity of the proximity sensor to environmental conditions; emitting a source signal by the proximity sensor based on the adjusted detection threshold of the proximity sensor; and receiving a return signal by the proximity sensor corresponding to the source signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of a portable electronic device for self-calibration of a proximity sensor, the method comprising:
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emitting a first source signal by the proximity sensor, the first source signal including a plurality of pulses; receiving a first return signal by the proximity sensor corresponding to the first source signal; determining whether the first return signal meets or exceeds a predetermined criterion based on timing of the plurality of pulses; determining a magnitude measurement of the first return signal based on signal strength of the plurality of pulses; adjusting a detection threshold of the proximity sensor based on the magnitude measurement in response to determining that the first return signal meets or exceeds the predetermined criterion; emitting a first source signal by the proximity sensor based on the adjusted detection threshold of the proximity sensor; and receiving a second return signal by the proximity sensor corresponding to the second source signal.
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Specification