Communication system with portable unit
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United States of America Patent
Stats
-
Jul 12, 1988
Issued Date -
N/A
app pub date -
Jun 12, 1984
filing date -
May 15, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optimized full duplex light wave communication system having a base unit and a portable unit. Two continuously operative channels exist between the base and portable units for two way communication at frequencies selected to minimize interference despite the presence of light within the environment of use at both frequencies. In addition, photo emitters and sensors are specifically configured in an assembly to minimize cross talk between sensors and emitters. A closed loop is formed around the two communication channels that it is operative to regulate the intensity of illumination received at the base photo sensors to a constant level that provides quality audio communications and minimizes portable unit battery drain. The closed loop additionally causes base station transmitter frequency tracking of any center frequency variation in the portable unit receiver.
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Family
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