G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 13/22 (2006.01) G08B 13/14 (2006.01) H04B 7/26 (2006.01)
Patent
CA 2109509
2109509 9221112 PCTABS00017 A portable anti-theft system and method for sounding an alarm which is a speech synthesizer when a first portable unit (10) and a second portable unit (12) become separated by a predetermined distance is disclosed herein. The system comprises transmitter means (11) in the first portable unit (10) for transmitting a signal (14), receiver means (13) in said second portable unit (12) for receiving the signal transmitted by the transmitter means (11), signal strength determination means (16) in communication with the receiver means (13) for comparing the strength of the received signal with a predetermined signal strength value, logic means (17) for triggering an alarm comprising speech synthesizing means (18) for making an announcement when the signal strength determination means (16) has determined that the strength of the received signal (14) is less that the predetermined signal strength value.
Murphy Daniel L.
Rosenthal Edward A.
Bistar Electronics Inc.
Smart & Biggar
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