Multiple frequency message system
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United States of America Patent
Stats
-
Apr 3, 1990
Grant Date -
N/A
app pub date -
Sep 12, 1988
filing date -
Sep 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiple frequency message system includes a transmitter for transmitting coded message signals on a plurality of channels of which at least one channel to be assigned to each of a plurality of geographical areas. The coded message signals include channel identification information and message information being transmitted in a sequence of coded transmission slots on each of the plurality of channels. The sequence of coded transmission slots are transmitted offset in time such that a particular transmission slot is not simultaneously transmitted on any of the plurality of channels in each geographical area. A receiver capable of receiving the coded message signals during a predetermined coded transmission slot being transmitted on the plurality of channels is also provided. The receiver includes a channel selecting circuit responsive to the detected channel identification information during the predetermined transmission slot for maintaining operation on a predetermined channel or, for sequentially receiving the predetermined transmission slot on each of the plurality of channels.
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