Recognition device intended to order the unlocking of a vehicle door and/or to authorize the starting of a vehicle
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United States of America Patent
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Jun 20, 2006
Grant Date -
Apr 22, 2004
app pub date -
Mar 11, 2002
filing date -
Mar 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A recognition device is described that is used to control the unlocking of vehicle openings and/or to authorize the start-up of the vehicle. The device includes a first emitter which, on command, can send a first user identification signal over a carrier wave having a given first frequency (.nu.1) to a receiver. The device also includes a second emitter which can emit at least one second user identification signal over a carrier wave having a second frequency (.nu.2) which is different from the first frequency such that the second signal can act as an identifier signal in the shadow zones where the first signal is not recognized.
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