Rolling code security system
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United States of America Patent
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Jan 21, 2014
Grant Date -
Jan 24, 2013
app pub date -
Sep 26, 2012
filing date -
May 17, 1995
priority date (Note) -
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Abstract
A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.
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