Westinghouse Electric Corporation

Ibiquity Digital Corporation

Richard Edward Martinson

Brian William Kroeger

Paul James Peyla

Jeffrey Scott Baird

Denise Maureen Cammarata

E Glynn Walden

This invention provides a method of broadcasting including the steps of providing a broadcast signal in a central frequency band of an FM radio channel; providing a first plurality of sub-carriers in an upper sideband of the FM radio channel; providing a second plurality of sub-carriers in a lower sideband of the FM radio channel; modulating a first group of the first plurality of sub-carriers with a complementary punctured convolution coded encoded version of program material; modulating a first group of the second plurality of sub-carriers with the complementary punctured convolution coded version of the program material; and transmitting the broadcast signal, the first group of the first plurality of sub-carriers and the first group of the second plurality of sub-carriers. In an all-digital version of the invention, the central frequency band may include a plurality of sub-carriers transmitted at a lower power level than that of the sub-carriers in the upper and lower sidebands. These additional sub-carriers can be used to transmit additional data. Transmitters and receivers which utilized the method are also included.

FM in-band-on-channel digital audio broadcasting method and system

A system for transmitting and receiving outbound and inbound data signals through a satellite communications network, the system having a network data rate and including a satellite and an end user transceiver, the system comprising a half-duplex mobile transceiver for transmitting and receiving the inbound and outbound data signals, respectively, for spreading the inbound data signal from the network data rate to a reduced data rate having an increased signal-to-noise ratio using a spread sequence, and for despreading the outbound data signal from the reduced data rate to the network data rate. The system also comprises an earth station, coupled to the end user transceiver, for transmitting and receiving the outbound and inbound data signals, wherein the earth station includes means for spreading the outbound data signal from the network data rate to the reduced data rate using the spread sequence, and means for despreading the inbound data signal from the reduced data rate to the network data rate, and wherein the end-user transceiver includes means for transmitting the outbound data signal and for receiving the inbound data signal.

Process and apparatus for satellite data communication

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Sykesville, MD, United States of America

Richard Edward Martinson