Telecommunications – Transmitter and receiver at separate stations – Near field
Reexamination Certificate
2005-08-02
2005-08-02
Chin, Vivian (Department: 2682)
Telecommunications
Transmitter and receiver at separate stations
Near field
C455S041200, C455S343100, C455S343300, C455S127500, C340S010500, C340S505000, C340S539100
Reexamination Certificate
active
06925287
ABSTRACT:
A signalling system includes a plurality of active transponders (10), an interrogation station (12) and a source (14) of switching signals. Each of the transponders has a microcontroller (20), a radio transceiver (34) for responding to radio interrogation signals from the interrogation station, the radio transceiver being coupled to the controller by way of switching means (36) which switches the transceiver on or off whilst leaving the microcontroller active, and a passive receiver (38) for receiving switching signals from the source of switching signals which signals are used by the microcontroller for switching-on or -off the transceiver. Transducers (26, 28, 30) may be coupled to the microcontroller for monitoring environmental features, such as ambient temperature and humidity, and data relating to the features is stored in a RAM (32) in readiness to be relayed to storage means (56) in the interrogation station (12) as and when required. Signals received by the passive receiver enable the radio transceiver to be de-activated in locations, such as in an aircraft, where spurious radiation from the transponder is not permitted and to be re-activated when removed from such a location.
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Philips I-CODE Labeling System.
Davie Alan J.
Marsden Ian A.
Chin Vivian
Koninklijke Philips Electronics , N.V.
Persino Raymond B.
Simons Kevin
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