Rolling code security system

Details Rolling code security system Rolling code security system

2005-12-21

2009-11-24

Song, Hosuk (Department: 2435)

Cryptography

Video cryptography

Video electric signal modification

C380S262000

Reexamination Certificate

active

07623663

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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