Patent ID: 6690796
Filing Date: 2004-02-10
Classification: G07C,H04L

Abstract:
A receiver for receiving an encrypted signal from a transmitter and for generating an actuation signal, comprising:receiving apparatus for receiving an encrypted radio frequency signal; a demodulator for demodulating the encrypted radio frequency signal into a demodulated encrypted signal; code separating apparatus for synchronizing with and separating the demodulated encrypted signal into a variable code portion and a fixed code portion; testing apparatus for testing the fixed code portion and generating a portion receipt signal in response thereto; window testing apparatus for testing whether a rolling code value is within a windowed range of rolling code values to avoid false triggering on a spurious rolling code having been transmitted by a person not having permission to authorize generation of the actuator signal and producing a rolling code signal in response thereto; a code updater for updating the variable code to an incremented rolling code; and signal generating apparatus for producing an actuator signal to produce an actuator command in response to the verified fixed code portion and the variable code.