END OF COMMUNICATION DETECTION
First Claim
1. An apparatus, comprising:
- an interface circuit for receiving an encoded signal;
a carrier signal recovery circuit coupled to an output of the interface circuit and configured and arranged todetermine and output a carrier signal of the encoded signal, andgenerate and output a second signal that is out of phase with the carrier signal;
a decoding circuit, coupled to the output of the interface circuit and to the carrier signal recovery circuit, configured and arranged to decode the encoded signal as a function of the encoded signal and the carrier signal output by the carrier signal recovery circuit; and
a detection circuit, coupled to the output of the interface circuit and to the carrier signal recovery circuit, configured and arranged to detect an indication of an end of a communication in the encoded signal as a function of the encoded signal and the second signal.
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0 Petitions
Accused Products
Abstract
An apparatus for detecting the end of a communication is disclosed. The apparatus includes an interface circuit for receiving an encoded signal and a carrier signal recovery circuit coupled to an output of the interface circuit. The carrier signal recovery circuit is configured to output a carrier signal of the encoded signal and a second signal that is out of phase with the carrier signal. The apparatus also includes a decoding circuit configured to decode the encoded signal as a function of both the encoded signal and the carrier signal output by the carrier signal recovery circuit. The apparatus also includes a detection circuit configured to detect an indication of an end of a communication in the encoded signal as a function of both the encoded signal and the second signal.
22 Citations
20 Claims
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1. An apparatus, comprising:
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an interface circuit for receiving an encoded signal; a carrier signal recovery circuit coupled to an output of the interface circuit and configured and arranged to determine and output a carrier signal of the encoded signal, and generate and output a second signal that is out of phase with the carrier signal; a decoding circuit, coupled to the output of the interface circuit and to the carrier signal recovery circuit, configured and arranged to decode the encoded signal as a function of the encoded signal and the carrier signal output by the carrier signal recovery circuit; and a detection circuit, coupled to the output of the interface circuit and to the carrier signal recovery circuit, configured and arranged to detect an indication of an end of a communication in the encoded signal as a function of the encoded signal and the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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determining a carrier signal of an encoded signal; phase shifting the carrier signal to produce a second signal that is out of phase with the carrier signal; decoding the encoded signal as a function of the encoded signal and the carrier signal; and detecting whether or not the encoded signal includes an indication of an end of a communication in the encoded signal by comparing the second signal with the encoded signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A near-field communication device, comprising:
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an interface circuit including, a loop antenna for receiving an encoded signal; and a power supply coupled to the loop antenna and configured and arranged to generate a power supply voltage from the encoded signal received by the loop antenna; a carrier signal recovery circuit powered by the power supply voltage, coupled to receive the encoded signal from an output of the interface circuit, and configured and arranged to determine and output a carrier signal of the encoded signal, and generate and output a second signal that is 90 degrees out of phase with the carrier signal; a decoding circuit, powered by the power supply voltage, coupled to the output of the interface circuit and to the carrier signal recovery circuit, and configured and arranged to decode the encoded signal as a function of the encoded signal and the carrier signal output by the carrier signal recovery circuit; and a detection circuit, powered by the power supply voltage, coupled to the output of the interface circuit and to the carrier signal recovery circuit, configured and arranged to detect an indication of an end of a communication in the encoded signal as a function of the encoded signal and the second signal. - View Dependent Claims (19, 20)
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Specification