Detecting a presence of near field communications (NFC) devices
First Claim
1. A method for detecting a presence of a first near field communication (NFC) capable device, comprising:
- generating, by a second NFC capable device, a carrier-frequency invariant magnetic field to detect for the presence of the first NFC capable device;
comparing the magnetic field with an a priori known response of the first NFC capable device to the carrier-frequency invariant magnetic field; and
determining the first NFC capable device to be present within an environment of the second NFC capable device when the carrier-frequency invariant magnetic field substantially matches the a priori known response.
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Abstract
A near field communications (NFC) device is disclosed that detects a presence of another NFC capable device within its magnetic field. The NFC device generates an unmodulated frequency varying detection sequence to generate a frequency varying magnetic field and/or a modulated frequency invariant detection sequence to generate a carrier-frequency invariant magnetic field. The NFC device samples these magnetic fields and compares these samples to various a priori known responses of various objects to determine whether another NFC device is present within the frequency varying magnetic field and/or the carrier-frequency invariant magnetic field.
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Citations
18 Claims
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1. A method for detecting a presence of a first near field communication (NFC) capable device, comprising:
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generating, by a second NFC capable device, a carrier-frequency invariant magnetic field to detect for the presence of the first NFC capable device; comparing the magnetic field with an a priori known response of the first NFC capable device to the carrier-frequency invariant magnetic field; and determining the first NFC capable device to be present within an environment of the second NFC capable device when the carrier-frequency invariant magnetic field substantially matches the a priori known response. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting a presence of a first near field communication (NFC) capable device, comprising:
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generating, by a second NFC capable device, a frequency varying magnetic field to detect for the presence of the first NFC capable device; comparing the frequency varying magnetic field with an a priori known response of the first NFC capable device to the magnetic field; and determining the first NFC capable device to be present within an environment of the second NFC capable device when the frequency varying magnetic field substantially matches the a priori known response. - View Dependent Claims (8, 9)
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10. A first near field communication (NFC) capable device for detecting a presence of a second NFC capable device using a carrier-frequency in magnetic field, comprising:
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a demodulator module configured to recover a detection sequence from the carrier-frequency invariant magnetic field; and a controller module configured to compare the carrier-frequency invariant magnetic field with an a priori known response of the first NEC capable device to the carrier-frequency invariant magnetic field and to determine the second NFC capable device to be present within an environment of the first NFC capable device when the carrier-frequency invariant magnetic field substantially matches the a priori known response. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A first near field communication (NFC) capable device for detecting a presence of a second NFC capable device using a frequency varying magnetic field, comprising:
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a demodulator module configured to recover a detection sequence from the frequency varying magnetic field; and a controller module configured to compare the frequency varying magnetic field with an a priori known response of the first NFC capable device to the frequency varying magnetic field and to determine the second NFC capable device to be present within an environment of the first NFC capable device when the frequency varying magnetic field substantially matches the a priori known response. - View Dependent Claims (17, 18)
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Specification