Digital broadcast system
First Claim
1. A digital audio broadcast (DAB) system, comprising:
- a master DAB radio broadcast station located at a main predetermined terrestrial location for formatting and broadcasting a plurality of channels of digitized program data in a spread spectrum, time and frequency hopping waveform to remote mobile and stationary receivers,a plurality of relatively low power DAB range extension radio broadcast stations, each said range extension DAB station being located in respective terrestrial areas having selected population densities and each range extension DAB station having means to receive and store (delay) one or more channels of program information from said master DAB station,a separate program distribution system coupling said means to receive and store at each of said range extension DAB radio broadcast station with said master DAB radio broadcast station, andmeans to synchronize channels of digital data re-broadcast from each of said range extension DAB radio broadcast stations with broadcasts from said master DAB radio broadcast station such that a mobile receiver traveling between edges of reception of two or more low power range extension DAB radio broadcast stations does not evidence interference therebetween.
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Accused Products
Abstract
A digital broadcast system, comprising a master radio broadcast station located at a main predetermined location for formatting and broadcasting a plurality of channels of digitized program data in a spread spectrum, time and frequency hopping waveform to remote mobile and stationary receivers. A plurality of relatively low power range extension radio broadcast stations are provided, each said range extension station being located in selected areas and, each range extension station being adapted to receive and store one or more channels of program information from the master station. A separate program distribution system coupling the received and store of each range extension radio broadcast station with the master radio broadcast station, said separate distribution system, including, for each range extension station at least one path selected form satellite, microwave, fiber-optic, coaxial cable and telephone paths, for coupling one or more channels of program information to each range extension station. The channels of digital data re-broadcast from each of the range extension radio broadcast stations is synchronized with broadcasts from the master radio broadcast station such that a mobile receiver traveling between edges of reception of two or more low power range extension radio broadcast stations does not evidence interference therebetween.
36 Citations
26 Claims
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1. A digital audio broadcast (DAB) system, comprising:
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a master DAB radio broadcast station located at a main predetermined terrestrial location for formatting and broadcasting a plurality of channels of digitized program data in a spread spectrum, time and frequency hopping waveform to remote mobile and stationary receivers, a plurality of relatively low power DAB range extension radio broadcast stations, each said range extension DAB station being located in respective terrestrial areas having selected population densities and each range extension DAB station having means to receive and store (delay) one or more channels of program information from said master DAB station, a separate program distribution system coupling said means to receive and store at each of said range extension DAB radio broadcast station with said master DAB radio broadcast station, and means to synchronize channels of digital data re-broadcast from each of said range extension DAB radio broadcast stations with broadcasts from said master DAB radio broadcast station such that a mobile receiver traveling between edges of reception of two or more low power range extension DAB radio broadcast stations does not evidence interference therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A digital audio broadcast (DAB) system, comprising:
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a master DAB radio broadcast station located at a main predetermined location for formatting and broadcasting a plurality of channels of digitized program data to remote mobile and stationary receivers, a plurality of relatively low power DAB range extension radio broadcast stations, each said range extension DAB station being located in respective areas having selected population densities and each range extension DAB station having means to receive and store one or more channels of program information from said master DAB station, a separate digitized program information distribution system coupling said means to receive and store at each of said range extension DAB radio broadcast station with said master DAB radio broadcast station, said separate distribution system, including, for each range extension station at least one path selected from microwave, fiber-optic and telephone paths, for coupling one or more channels of program information to each range extension station, satellite timing means at each range extension station to synchronize channels of digital data re-broadcast from each of said range extension DAB radio broadcast stations with broadcasts from said master DAB radio broadcast station such that a mobile receiver traveling between edges of reception of two or more low power range extension DAB radio broadcast stations does not evidence interference therebetween, and each said broadcast station including digital compression means coupled to said distribution system for compressing said program data, convolution encoder means for convolution encoding said program data, frame interleaver means connected to said convolution encoder for interleaving frames of program data, means connected to said frame interleaver for providing a training control header on each frame of program data and frequency hopping means for each channel of program data.
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11. A digit al broadcast system, comprising:
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a master radio broadcast station located at a main predetermined location for formatting and broadcasting a plurality of channels of digitized program data in a spread spectrum, time and frequency hopping waveform to remote mobile and stationary receivers, a plurality of relatively low power range extension radio broadcast stations, each said range extension station being located in selected areas and each range extension station having means to receive and store one or more channels of program information from said master station, a separate program distribution system coupling said means to receive and store at each of said range extension radio broadcast station with said master radio broadcast station, said separate distribution system, including, for each range extension station at least one path selected from satellite, microwave, fiber-optic, coaxial cable and telephone paths, for coupling one or more channels of program information to each range extension station, and means to synchronize the channels of digital data re-broadcast from each of said range extension radio broadcast stations with broadcasts from said master radio broadcast station such that a mobile receiver traveling between edges of reception of two or more low power range extension radio broadcast stations does not evidence interference therebetween. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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- 19. A digital broadcast system comprising at least one radio broadcast station having means for formatting a plurality of channels of digitized program data and means for broadcasting said channels of digitized program data in a spread spectrum waveform.
Specification