Tag frequency control

Details Tag frequency control Tag frequency control

2005-05-31

2011-10-25

Urban, Edward (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

With control signal

C455S068000, C455S067150, C455S039000, C455S265000, C455S003010, C340S010100, C340S010420, C375S256000, C375S213000, C375S333000, C375S259000, C375S239000

Reexamination Certificate

active

08045930

ABSTRACT:
A communication system comprising one or more transceiver units of a first type and one or more transceiver units of a second type capable of communicating with the transceiver units of the first type; each transceiver unit of the first type comprising: a frequency comparison unit for comparing the frequency of a signal received from a transceiver unit of the second type with a reference frequency; a feedback signal generator for generating a feedback signal dependent on the result of that comparison; and a transmitter for transmitting that signal to the transceiver unit of the second type; and each transceiver unit of the second type comprising: a local frequency reference unit on which the frequency of signals transmitted by it are dependent; and a frequency adjustment unit for receiving the feedback signal and adjusting the local frequency reference unit in dependence on the feedback signal.

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patent: 2004/0214538 (2004-10-01), Ballantyne et al.
patent: 1168617 (2002-01-01), None
patent: 03/098528 (2003-11-01), None

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