Dual mode cellular telephone apparatus
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United States of America Patent
Stats
-
Jul 13, 1993
Grant Date -
N/A
app pub date -
Apr 15, 1991
filing date -
Apr 15, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Dual mode cellular telephone apparatus for communicating in analog or digital modes. A portable unit adapted to communicate substantially only in an analog mode is operable to transmit voice signals supplied from an audio input to a cellular base station and to couple voice signals received from a cellular base station to an audio output. The portable unit, which is capable of operating as a stand alone device, is connectable to a mobile unit adapted to communicate in both analog and digital modes with the cellular base station. When the units are connected, voice signals pass through the mobile unit to and from the portable unit for communication with the base station. A control unit determines whether the mobile unit operates in an analog mode or a digital mode.
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Family
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