Dual band digital broadcast receiver
First Claim
1. A dual band digital broadcast receiver comprisingmeans for receiving a first digital broadcast signal and reference information in a first frequency band,means for receiving a second digital broadcast signal in a second frequency band, said second frequency band being selected independently of said first frequency band,means for converting the first digital broadcast signal to the second frequency band, in dependence upon the received reference information, anda combiner for combining the converted first digital broadcast signal with the second digital broadcast signal, the combiner operating in said second frequency band.
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Accused Products
Abstract
A digital broadcast transmission system comprises a plurality of spaced transmitters (6). Each transmitter (6) receives signals for transmission from a master transmitter (2), e.g. on a satellite, along with a reference frequency (FREF). The reference frequency is used to generate the transmission frequency at each spaced transmitter. At a receiver (12), conversion means can be used, to enable signals from the master transmitter (2) and from the other transmitter(s) to be received. A preferred application is digital audio broadcasting (DAB). Specifically, the present invention is useful in connection with Coded Orthogonal Frequency Division Multiplex (COFDM) modulation.
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Citations
14 Claims
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1. A dual band digital broadcast receiver comprising
means for receiving a first digital broadcast signal and reference information in a first frequency band, means for receiving a second digital broadcast signal in a second frequency band, said second frequency band being selected independently of said first frequency band, means for converting the first digital broadcast signal to the second frequency band, in dependence upon the received reference information, and a combiner for combining the converted first digital broadcast signal with the second digital broadcast signal, the combiner operating in said second frequency band.
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9. Apparatus for converting a single band digital broadcast receiver to a dual band digital broadcast receiver, comprising
means for receiving a first digital broadcast signal and reference information in a first frequency band, means for receiving a second digital broadcast signal in a second frequency band, said second frequency band being selected independently of said first frequency band, means for converting the first digital broadcast signal to the second frequency band, in dependence upon the received reference information, and a combiner for combining the converted first digital broadcast signal with the second digital broadcast signal, the combiner operating in said second frequency band.
Specification