Differential range remote control
AssigneeAudiovox Corporation
InventorScott Christie
Life of this patent
Estimating the term…
Abstract
A remote-control vehicle lock-and-alarm system provides improved security against “code-grabber” devices used to detect and counterfeit the codes used by a vehicle lock-and-alarm system. Two sets of control codes are provided. One set of control codes that does not affect the security status of the lock-and-alarm system is transmitted over a maximum range, for the sake of convenience. The other set of control codes is used for critical security features which change the security status of the lock-and-alarm system and is transmitted over a much shorter range to prevent detection and counterfeiting of the control codes.
Claims14
An apparatus for remotely controlling a vehicle security system, the apparatus comprising:
- a transmitter for transmitting a first signal which changes a security status of the vehicle security system and a second signal which does not change the security status of the vehicle security system, said transmitter transmitting said first signal throughout a first range and transmitting said second signal throughout a second range, said first range being smaller than said second range.
A vehicle security system comprising:
- a vehicle alarm for detecting and indicating unauthorized access to a vehicle and for locking/unlocking vehicle openings;
- a receiver for receiving signals for arming/disarming the vehicle alarm;
- and
- a transmitter for transmitting to the receiver a first signal for changing a security status of the vehicle security system and a second signal which does not change the security status of the vehicle security system, said transmitter transmitting said first signal throughout a first range and transmitting said second signal throughout a second range, said first range being smaller than said second range.
A method for remotely controlling a security system, the method comprising the steps of:
- transmitting a first signal which changes a security status of the security system throughout a first range;
- and
- transmitting a second signal that does not change the security status of the security system throughout a second range which is greater than the first range.
Dependencies are inferred from the claim text.