Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Reexamination Certificate
2005-05-04
2008-10-28
Vo, Nguyen (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
C340S010100
Reexamination Certificate
active
07444120
ABSTRACT:
A method for controlling signal decay of a transmitted signal within a transmitter is described. The method includes measuring an amount of current induced back into the transmitter by the decaying signal, and using the current measurement to control the decay of the signal after the signal is transmitted from the load. A transmitter for an electronic article surveillance (EAS) system is also described which includes a current sensing circuit configured to at least sense an amount of current induced back into the transmitter by the load after transmission of the signal, and a transmitter control circuit configured to utilize the sensed current to determine an amount and a polarity of current to be applied to the load to reduce the induced current to a desired value.
REFERENCES:
patent: 5781111 (1998-07-01), Easter et al.
patent: 6476708 (2002-11-01), Johnson
patent: 2002/0196144 (2002-12-01), Belka et al.
Frederick Thomas J.
Herring Richard L.
Oakes Jeffrey T.
Sensormatic Electronics Corporation
Small Dean D.
The Small Patent Law Firm
Vo Nguyen
LandOfFree
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