RF door activation system

Details RF door activation system RF door activation system

2005-02-04

2009-06-09

Hsu, Alpus H (Department: 2419)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C340S005610, C340S870030, C375S354000

Reexamination Certificate

active

07545833

ABSTRACT:
The present invention provides a radio frequency (“RF”) activation system with improved operating capability and ease of installation. Improved responsiveness is provided by the receiver which determines the frame timing of incoming signals and calculates the estimated time of arrival for ensuing frames thus minimizing loss of frame synchronization problems. In one embodiment, this is accomplished by determining the time span of the frame start sequence and using this to determine the frame timing of an incoming RF signal. The receiver also makes corrections for timing errors between the receiver and transmitter by re-synchronizing the receiver with the incoming RF signal.

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