NFC device and apparatus
First Claim
1. An NFC device comprising a modulation-depth detector operable to detect a plurality of different modulation depths, said detector responsive to receipt of a signal by said NFC device to generate a depth signal for transmission to a controller for said NFC device indicative of the modulation depth of said received signal.
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Accused Products
Abstract
An NFC device comprises a modulationdepth detector (114) capable of detecting a plurality of different modulation depths, said detector responsive to receipt of a signal (105, 106) by said NFC device to determine which modulation depth of said plurality of different modulation depths has been used to modulate said signal received by said NFC device and generate a signal (117) for transmission to a controller (100) that indicates the modulation depth of said received signal, said controller (100) being configured on receipt of said signal from said detector (114) to select for demodulation of subsequent signals received by said NFC system a demodulator (115, 116) that is capable of demodulating signals of the modulation depth detected by said detector (114). The controller (100) may form a part of the NFC device itself or be a part of host apparatus in which the NFC device is located.
48 Citations
22 Claims
- 1. An NFC device comprising a modulation-depth detector operable to detect a plurality of different modulation depths, said detector responsive to receipt of a signal by said NFC device to generate a depth signal for transmission to a controller for said NFC device indicative of the modulation depth of said received signal.
- 12. A modulation-depth detector for use in an NFC device, the detector comprising a data recogniser configured to receive a plurality of demodulated signals each of which have been derived from a single received signal of unknown modulation depth and a plurality of associated reference signals, said data recogniser being operable to compare said received demodulated signals with respective reference signals and output a match signal indicating which of said received demodulated signals at least substantially matches the reference signal with which it has been compared.
- 14. An NFC device comprising a plurality of demodulators wherein each demodulator is configured to demodulate signals of respective modulation depth.
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22. A method of operating an NFC device, the method comprising:
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providing a controller;
a plurality of demodulators each of which is configured to demodulate received signals of a different modulation depth and outputting a demodulated signal; and
a detector arranged to receive the demodulated signals from said demodulators and a plurality of reference signals, compare respective received demodulated signals with associated reference signals, and output a match signal indicating which of said received signals at least substantially matches the reference signal with which it has been compared;
receiving a signal of unknown modulation type to initiate a communications session;
demodulating said unknown signal using said plurality of demodulators to generate a plurality of demodulated signals;
comparing said plurality of demodulated signals with their associated reference signals;
outputting to said controller a signal indicating which of said demodulators has generated a demodulated signal that at least substantially matches the associated reference signal, and controlling the system to demodulate received signals for a remainder of said session using only that demodulator which has been indicated by said detector as generating a signal which at least substantially matches the associated reference signal.
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Specification