| 摘要 |
A pocket-size electronic travel and commuter pass which can be used for making valid payment of fares or purchases of services and goods, is disclosed. The pass contains capacitive plates or inductive coils in pairs of two a.nd are operated in such a way that their mutual phasing is correct for close proximity signal communications with an accountancy system. Noise and interference signals will appear in antiphase on the plates or coils and will not affect the desired signal communication. As a result, the pass exhibits a high signal to noise ratio.
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