Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1997-09-25
2000-07-18
Bost, Dwayne D.
Communications: electrical
Condition responsive indicating system
With particular coupling link
455 9, 455 673, 455 88, H04Q 148
Patent
active
060913290
ABSTRACT:
A monitor/hands-free intercom system includes a child unit and a parent unit which are each transceivers. The parent unit operates primarily as a receiver, unless and until a talk switch is actuated on the parent unit, enabling the parent unit to transition to a transmitter. The child unit acts primarily as a transmitter unless and until it detects a carrier signal at the appropriate frequency during one of its short sniff periods. If a carrier signal is detected, the child unit extends the sniff period to look for a non-audible hidden tone encoded into the transmission from the parent unit. If the hidden tone is detected, the child unit transitions to a receiver mode and is able to play back the sound waves detected by the parent unit so that the parent can reassure or provide instructions to the child.
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Bost Dwayne D.
Crouch Robert G.
Evenflo Company, Inc.
Gantt Alan T.
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