Communication terminal for electronic payment, such as electronic wallet, comprises resonant circuit, sinusoidal generator, receivers with sensors and BPSK synchronous demodulator

摘要

Terminal (10) has resonant circuit capacity-inductance (14); sinusoidal generator (12) applying alternative signal to resonant circuit so as to direct field towards mobile object; receiver coupled to circuit so as to pick up disturbance induced by mobile object. Receivers have sensors (40-50) generating BPSK modulated signal (A) simulating data from mobile object to terminal. Receivers also have BPSK synchronous demodulator (92 - 140) able to demodulate subcarrier of signal from sensors.