Satellite digital audio radio service tuner architecture for reception of satellite and terrestrial signals
First Claim
1. A receiver comprising:
- first means for down-converting a first ensemble in a received signal in a first mode of operation and for down-converting a second ensemble in said received signal in a second mode of operation, said first ensemble being transmitted with a first carrier and comprising a first signal received from a first transmitter, a first signal received from a second transmitter, and a first signal received from a third transmitter and said second ensemble being transmitted with a second carrier and comprising a second signal from said first transmitter, a second signal from said second transmitter, and a second signal from said third transmitter and second means for selectively switching said first means from said first mode to said second mode.
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Accused Products
Abstract
A satellite digital audio radio receiver system and method. The inventive receiver includes a circuit for down-converting a first ensemble in a received combined signal in a first mode of operation and for down-converting a second ensemble from the received combined signal in a second mode of operation. The first ensemble includes a first signal received from a first transmitter, a second signal received from a second transmitter, and a third signal received from a third transmitter. The second ensemble includes a second signal from the first transmitter, a second signal from the second transmitter, and a second signal from the third transmitter. A controller is included to selectively switch the circuit from the first mode to the second mode. The first ensemble comprises first, second and third frequency slots and the second ensemble comprises fourth, fifth, and sixth frequency slots. In the illustrative embodiment, the first and second transmitters are mounted on first and second satellites and the third transmitter is a terrestrial repeater. Both ensembles are transmitted in accordance with the XM frequency plan. The first ensemble is down-converted using low side injection and the second ensemble down-converted using high side injection. The inventive circuit includes a synthesized frequency source. The circuit further includes a first intermediate frequency down-conversion stage with a first mixer for mixing the received combined signals with the output of synthesized frequency source. The circuit further includes first and second surface acoustic wave filters for separating the first and second signals received from the third signals. The inventive circuit further includes a second intermediate frequency down-conversion stage having second and third mixers for mixing the outputs of the first and second filters, respectively, with the output of a local oscillator.
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Citations
24 Claims
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1. A receiver comprising:
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first means for down-converting a first ensemble in a received signal in a first mode of operation and for down-converting a second ensemble in said received signal in a second mode of operation, said first ensemble being transmitted with a first carrier and comprising a first signal received from a first transmitter, a first signal received from a second transmitter, and a first signal received from a third transmitter and said second ensemble being transmitted with a second carrier and comprising a second signal from said first transmitter, a second signal from said second transmitter, and a second signal from said third transmitter and second means for selectively switching said first means from said first mode to said second mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A receiver comprising:
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a switchable dual voltage controlled oscillator circuit for down-converting a first ensemble in a received combined signal in a first mod e of operation and for down-converting a second ensemble in a second mode of operation, said first ensemble being transmitted with a first carrier and including first, second and third frequency slots having a first signal in said first slot received from a first satellite, a first signal in said second slot received from a second satellite, and a first signal in said third slot received from a terrestrial repeater and said second ensemble being transmitted with a second carrier and including fourth, fifth, and sixth frequency slots from having a second signal from said first satellite in said fourth slot, a second signal from said second satellite in said fifth slot, and a second signal from said terrestrial repeater in said sixth slot and a controller for selectively switching said switchable dual voltage controlled oscillator circuit from said first mode to said second mode. - View Dependent Claims (17, 18, 19)
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20. A receiver comprising:
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a switchable dual voltage controlled oscillator circuit for down-converting a first ensemble in a received combined signal the first mode operation and for down-converting a second ensemble in said received combined signal in a second mode of operation, said first ensemble being transmitted with a first carrier and comprising a first signal received from a first satellite, a first signal received from a second satellite, and a first signal received from a terrestrial repeater and said second ensemble being transmitted with a second carrier and comprising a second signal from said first satellite, a second signal from said second satellite, and a second signal from said terrestrial repeater, said switchable voltage controlled oscillator circuit including;
a first intermediate frequency down-conversion stage with a first mixer for mixing said received combined signals with the output of said voltage controlled oscillator, first and second filters for separating said first and second signals received from said third signals, and a second intermediate frequency down-conversion stage having second and third mixers for mixing the outputs of said first and second filters, respectively, with the output of a local oscillator and a controller for selectively switching said switchable dual voltage controlled oscillator circuit from said first mode to said second mode. - View Dependent Claims (21, 22)
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23. A method for down-converting a received signal including the steps of:
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down-converting a first ensemble in a received combined signal in a first mode of operation and for down-converting a second ensemble in said received combined signal in a second mode of operation, said first ensemble being transmitted with a first carrier and comprising a first signal received from a first transmitter, a first signal received from a second transmitter, and a first signal received from a third transmitter and said second ensemble being transmitted with a second carrier and comprising a second signal from said first transmitter, a second signal from said second transmitter, and a second signal from said third transmitter and selectively switching from said first mode to said second mode.
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24. A receiver comprising:
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first means for down-converting a first ensemble in a received signal in a first mode of operation and for down-converting a second ensemble in said received signal in a second mode of operation, said first ensemble being transmitted with a first carrier and comprising a first signal received from a first transmitter, a first signal received from a second transmitter, and a first signal received from a third transmitter and said second ensemble being transmitted with a second carrier and comprising a second signal from said first transmitter, a second signal from said second transmitter, and a second signal from said third transmitter, said first means including;
a switchable dual voltage controlled oscillator, a first intermediate frequency down-conversion stage with a first mixer for mixing said received combined signals with the output of said voltage controlled oscillator, first and second filters for separating said first and second signals received from said third signals, and a second intermediate frequency down-conversion stage having second and third mixers for mixing the outputs of said first and second filters, respectively, with the output of a local oscillator and second means for selectively switching said first means from said first mode to said second mode.
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Specification