Vehicle security system

Details Vehicle security system Vehicle security system

1997-01-28

1998-09-22

Swarthout, Brent A.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

307 102, 34082569, B60R 2510

Patent

active

058120513

ABSTRACT:
A vehicle security system comprises a transmitter 18 for transmitting coded signals, a receiver 16 for receiving the coded signals, and a control unit 14 for operating an engine immobilization system 12 in response to receipt by the receiver 16 of a valid coded signal. The transmitter 18 is arranged to transmit the coded signal as a sequence of pulses of electromagnetic radiation which are amplitude modulated at a modulating frequency, and the receiver includes an audio frequency filter arranged to pass signals having a frequency within a range including said modulating frequency. This allows the filtering out of high powered interfering signals which are of the same radio frequency as used in the system, but which are not modulated at the same audio frequency.

REFERENCES:
patent: 3316488 (1967-04-01), Reynolds
patent: 4087753 (1978-05-01), Paul
patent: 4399438 (1983-08-01), Bonner
patent: 4697092 (1987-09-01), Roggendorf et al.
patent: 4940964 (1990-07-01), Dao
patent: 5055701 (1991-10-01), Takeuchi
patent: 5132660 (1992-07-01), Chen et al.
patent: 5293527 (1994-03-01), Sutton et al.
patent: 5369706 (1994-11-01), Latka
patent: 5508687 (1996-04-01), Gebhardt et al.

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