Multiplex communications – Communication over free space – Portable address responsive receiver
Patent
1995-08-04
1998-05-26
Marcelo, Melvin
Multiplex communications
Communication over free space
Portable address responsive receiver
34082544, 455 381, 455 45, H04Q 708
Patent
active
057577820
ABSTRACT:
Pager data is transmitted at different subcarrier frequencies on different FM broadcast channels. The subcarrier frequency of the pager data is selected to avoid conflicts with signals transmitted from other systems. The pager receiver decodes data at any one of the multiple subcarrier frequencies according to the active subcarrier used on the currently tuned broadcast channel. In one embodiment, the subcarrier frequency of the pager data is contained in control packets of a time division multiplexed data frame. The receiver decodes the control packets to determine which broadcast frequencies and associated subcarrier frequencies contain potential pager signals. The receiver accordingly searches the identified broadcast frequency and automatically reconfigures a circuit demodulator to decode data packets at the identified subcarrier frequencies.
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"High Speed Subcarrier Is Wave of Future" by Lyle Henry, Guest Commentary, Radio World, Jun. 1, 1994.
Galbi Elmer
Marcelo Melvin
Seiko Communications Systems Inc.
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