| 摘要 |
<p>A rescue device has a motion detector and a transceiver that operates either to transmit a locating signal, which can be tracked by others, or to receive and track a locating signal transmitted by another. A control logic circuit suppresses transmission of the locating signal by the transceiver unless a motion signal, generated by the motion detector responsive to the user's movement, indicates that the user has not moved for a predetermined time interval. Thus, the rescue device can transmit the locating signal when the user is motionless, providing notice that the user is immobile and aiding others in locating the user. When the receiver is operating, it guides the user in locating the source of a transmitted locating signal to aid the user in locating an immobilized person or a building exit. An override can be provided to allow transmission of the locating signal regardless of movement.</p> |
