| 摘要 |
A tracking system (10) for monitoring and locating vehicles includes a cellular telephone (14) that is located in the vehicule, a global positioning system (GPS) receiver also located with the vehicle, and an interface unit between global position receiver and the telephone. The global positioning receiver communicates with a system of satellites and provides continuous data, reflecting the present spacial position of the vehicle in terms of its latitude/longitude coordinates. The interface between the GPS receiver and the wireless telephone includes a speech synthesizer circuit which converts the digitally encoded spacial coordinates into speech, which enunciates the position through the cellular telephone.
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