Cellular telephone responsive to service availability for operating on different cellular telephone systems
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United States of America Patent
Stats
-
Apr 16, 1991
Issued Date -
N/A
app pub date -
Apr 20, 1990
filing date -
Dec 20, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A unique dual-system cellular telephone includes a transceiver (100) having a dual bandwidth receiver, an audio/logic unit (200) having dual control programs, and a handset unit (300). The dual bandwidth receiver of the transceiver (100) has different filters (408 and 410) in the intermediate frequency section thereof which are switchably selected depending on which cellular telephone system is available. When service is not available in one of the cellular telephone systems, the unique cellular telephone automatically switches the receiver bandwidth and control program for operating on the other cellular telephone system.
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