Audiovox Corporation

Audivox Corporation

Scott Christie

John R DiCroce

A remote-control vehicle lock-and-alarm system provides improved security against &ldquo;code-grabber&rdquo; 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.

Differential range remote control

A vehicle alarm system with a sensor for detecting a change in the alarm system from an armed not triggered state to an armed triggered state, an override switch operable only when the alarm system is in the armed triggered state, to stop the alarm from sounding in the armed triggered state, an ignition switch, an ignition sensor, and a controller for switching the alarm system from the armed triggered state to the disarmed state when the ignition sensor supplies a signal indicating ignition on while a timing circuit is activated and maintaining the alarm system in an armed triggered state when no ingition signal is supplied while the timing circuit is activated.

Vehicle alarm system

An upgrade method and apparatus for both remote and key-operated two-step vehicle security systems is disclosed. The upgrade blocks attempts to disarm the alarm circuit when the vehicle is armed and unlocked improperly. The upgrade can be added to existing systems regardless of the polarity of the signals used therein. Improved power-up and remote control features can also be added as a part of the upgrade.

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Weymouth, MA, United States of America

Scott Christie