| 摘要 |
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.
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