Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1997-05-09
1998-09-22
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340571, 340573, 34082549, G08B 108
Patent
active
058120564
ABSTRACT:
A wireless child monitoring and location device consisting of a device pair having a guardian unit and a child unit, both of which are operable in the 900 MHz frequency band and in the presence of other wireless devices transmitting and receiving within the same frequency band. The guardian unit is able to detect when a child strays beyond a preset distance or when the child is simply out of sight, e.g. around a corner but within the preset distance. The child and guardian units execute a "handshake" sequence during power-up to select a unique digital operating address or channel and establish a time marker used to synchronize transmission between the units. This allows each child/guardian pair to operate in the presence of similarly configured devices without the undesirable possibility of interference among the devices. The child and guardian units are capable of electronically reconnecting if communication between the units is interrupted. The guardian unit is capable of communicating a preset delay period to the child unit to offset the start point of the time marker to avoid jamming from other similarly configured units operating in the vicinity.
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Golden Eagle Electronics Manufactory Ltd.
Hofsass Jeffery A.
Pope Daryl
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