Adapter for connecting computer to satellite antenna
First Claim
Patent Images
1. An apparatus comprising:
- a connector that is configured to connect said apparatus to an antenna device comprising an antenna capable of receiving a signal from a satellite, wherein the signal comprises a plurality of data streams, each of the plurality of data streams including identifying information that uniquely identifies the data stream and being encrypted so that the data stream is to be decrypted using a key selected in accordance with the identifying information;
a tuner that is configured to receive a satellite signal from said connector and to perform tuning on the satellite signal;
a demodulator that is configured to receive the tuned satellite signal from said tuner and to perform demodulation on the tuned satellite signal, thereby outputting a demodulated data stream;
a forward error corrector that is configured to receive the demodulated data stream from said demodulator and to perform forward error correction on the demodulated data stream, thereby outputting a corrected data stream;
a conditional access unit that is configured to determine whether or not a personal computer is authorized to receive a data stream of the plurality of data streams by comparing the identifying information of the corrected data stream to stored identifying information;
a decryptor that is configured to, in accordance with the determination by said conditional access unit, receive the corrected data stream and to perform decryption upon encrypted frames within the corrected data stream, thereby outputting decrypted frames; and
an interface that is configured to receive the decrypted frames from said decryptor and to output the decrypted frames to the personal computer for further processing.
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Accused Products
Abstract
A method and apparatus for an adapter card, for use in a computer, to provide conditional access by the computer to incoming data streams while maintaining the security of information by maintaining a listing of addresses corresponding to data streams which the computer is authorized to receive, receiving and determining the address of a frame, determining whether the frame address matches an address maintained in an Access Table, and processing and transmitting only those frames of data streams which the computer is authorized to receive.
63 Citations
21 Claims
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1. An apparatus comprising:
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a connector that is configured to connect said apparatus to an antenna device comprising an antenna capable of receiving a signal from a satellite, wherein the signal comprises a plurality of data streams, each of the plurality of data streams including identifying information that uniquely identifies the data stream and being encrypted so that the data stream is to be decrypted using a key selected in accordance with the identifying information;
a tuner that is configured to receive a satellite signal from said connector and to perform tuning on the satellite signal;
a demodulator that is configured to receive the tuned satellite signal from said tuner and to perform demodulation on the tuned satellite signal, thereby outputting a demodulated data stream;
a forward error corrector that is configured to receive the demodulated data stream from said demodulator and to perform forward error correction on the demodulated data stream, thereby outputting a corrected data stream;
a conditional access unit that is configured to determine whether or not a personal computer is authorized to receive a data stream of the plurality of data streams by comparing the identifying information of the corrected data stream to stored identifying information;
a decryptor that is configured to, in accordance with the determination by said conditional access unit, receive the corrected data stream and to perform decryption upon encrypted frames within the corrected data stream, thereby outputting decrypted frames; and
an interface that is configured to receive the decrypted frames from said decryptor and to output the decrypted frames to the personal computer for further processing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20)
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13. An apparatus comprising:
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a connector that is configured to connect said apparatus to an antenna device comprising an antenna capable of receiving a signal from a satellite, wherein the signal comprises a plurality of data streams, each of the plurality of data streams including identifying information that uniquely identifies the data stream and being encrypted so that the data stream is to be decrypted using a key selected in accordance with the identifying information;
a tuner that is configured to receive a satellite signal from said connector and to perform tuning on the satellite signal;
a demodulator that is configured to receive the tuned satellite signal from said tuner and to perform demodulation on the tuned satellite signal, thereby outputting a demodulated data stream, a forward error corrector that is configured to receive the demodulated data stream from said demodulator and to perform forward error correction on the demodulated data stream, thereby outputting a corrected data stream;
a conditional access unit that is configured to determine whether or not the personal computer is authorized to receive a data stream of the plurality of data streams by comparing the identifying information of the corrected data stream to stored identifying information;
a decryptor that is configured to, in accordance with the determination by the conditional access unit, receive the corrected data stream and to perform decryption upon encrypted frames within the corrected data stream, thereby outputting decrypted frames; and
an interface that is configured to receive the decrypted frames from said decryptor and to output the decrypted frames to the personal computer, wherein said apparatus is an adapter card insertable into the personal computer, wherein each encrypted frame comprises, as the identifying information, an address header, wherein the antenna device further comprises a low noise block, and said connector is configured to provide power to the low noise block using power from the personal computer, wherein said forward error corrector comprises a Viterbi decoder, wherein said tuner is controlled by the personal computer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 21)
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Specification