| 摘要 |
The invention concerns a theft protection system with special facilities to suppress electrical noise very well. The preferred embodiment of the system provides a very high integrity. Compatible with the provisions to suppress noise and to increase the integrity is a feature which signals missing merchandise even when functional modules have been disconnected from the controlling system. Several modulation/demodulation techniques are given to make the system immune to external conditions and to increase its functionality. <IMAGE>
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