Multiplex communications – Wide area network – Packet switching
Patent
1992-11-10
1995-06-27
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 691, 370 71, 370 76, 370120, 370123, 370 11, 455 45, H04J 114
Patent
active
054286107
ABSTRACT:
A wide band, wide area FM-SCA radio system has a central station that transmits multiple audio signals and digital data signals through a satellite network to FM stations participating in the system. Each FM station demodulated and time multiplexes the audio and digital signals with a control signal to form a first baseband waveform having a frequency range corresponding to the SCA frequency bandwidth.
The first baseband waveform and a regular FM baseband waveform are combined into a composite band waveform that is single-sideband modulated onto the station carrier for retransmission to FM-SCA receivers in the coverage area.
Each FM-SCA receiver demodulates the received signal and separately processes the regular FM signal, the FM-SCA audio signals, and the FM-SCA digital data signals. A user interface is provided for audio output selection.
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Olms Douglas W.
Vu Huy D.
World Communication Ventures, Inc.
LandOfFree
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