Method for operating an anti-theft system and anti-theft system

Details Method for operating an anti-theft system and anti-theft system Method for operating an anti-theft system and anti-theft system

1997-02-18

1999-07-20

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

307 101, 307 102, 307 103, 34082554, G07D 700, B60L 100, B60R 2500, B60R 2504

Patent

active

059261072

ABSTRACT:
In a method for operating an anti-theft system and an anti-theft system operating according to the method, a stationary transceiver sends a question code signal to a portable transponder, which in turn responds with an answer code signal. The answer code signal is scanned at predetermined scanning times and a piece of code information is demodulated therefrom. If the first bits of the answer code signal are already unreadable, then the scanning time is displaced by a phase angle, and the remainder of the answer code signal is read.

REFERENCES:
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5428638 (1995-06-01), Cioffi et al.
patent: 5616966 (1997-04-01), Fischer et al.

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