Apparatus and method for satellite receiver computer adaptor card

• US 5,699,384 A
• Filed: 11/07/1996
• Issued: 12/16/1997
• Est. Priority Date: 11/14/1994
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Original Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Inventors: Dillon, Douglas M.
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): GLUCK, JEFFREY WILLIAM
• Application Number:
  US08/745,191
• Time in Patent Office: 404 Days
• Field of Search: 375/316, 455/150.1, 455/161.2, 455/161.3, 455/343, 307/82, 363/131, 363/140
• US Class Current: 375/316
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: H04B 7/18593 Arrangements for preventing unauthorised access or for providing user protection arrangements for secret or secure communication H04L9/00
• CPC Class Codes: H04H 40/18 Arrangements characterised by circuits or components specially adapted for receiving
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04H 60/15 on receiving information
• CPC Class Codes: H04H 60/23 using cryptography, e.g. encryption, authentication, key distribution
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/062 for key distribution, e.g. centrally by trusted party cryptographic mechanisms or cryptographic arrangements for key distribution involving a central third party H04L9/0819
• CPC Class Codes: H04L 63/065 for group communications cryptographic mechanisms or cryptographic arrangements for key management involving conference or group key H04L9/0833
• CPC Class Codes: H04L 63/104 Grouping of entities
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04N 7/163 by receiver means only

Abstract

A printed circuit board intended to be placed within a card slot of a personal computer that allows the personal computer to receive information directly from a satellite communication network. The adaptor card operates in slave mode to a CPU of the personal computer. The CPU receives demodulated signals from a demodulator of the adaptor card via a bus interface on the adaptor card. The CPU also receives status information for the demodulator and a tuner and controls the operation of the demodulator and tuner via the bus interface. A DC-DC converter receives power from a power supply of the personal computer via the bus interface and provides power for the adaptor card circuitry. Moreover, the DC-DC converter powers a low noise block (LNB) of an antenna of the satellite communication network.

Claims

1. An adaptor card for use in a personal computer, for enabling the personal computer to receive a signal from a satellite communication network, comprising:

a connector for receiving a plurality of signals from the satellite communication network;

a tuner, connected to the connector, that receives the plurality of signals from the connector and selects a single signal for reception;

a demodulator, connected to the tuner, that converts the selected signal from the tuner into a digital data stream;

a bus interface, connecting the adaptor card and the personal computer, that allows the digital data stream, a demodulator status and a tuner status to be transmitted from the adaptor card to the personal computer; and

a DC-DC converter for receiving a voltage signal from a power supply of the personal computer and converting the voltage signal into a plurality of voltage signals for providing power to the tuner.

2. The adaptor card of claim 1, wherein the bus interface allows the personal computer to send commands to the tuner and to the demodulator, to control operation of the tuner and the demodulator.

3. The adaptor card of claim 1, wherein the bus interface is an ISA bus interface.

4. The adaptor card of claim 1, wherein the bus interface is a Microchannel bus interface.

5. The adaptor card of claim 1, wherein the bus interface is an EISA bus interface.

6. The adaptor card of claim 1, wherein the bus interface is an PCI bus interface.

7. The adaptor card of claim 1, further comprising at least one forward error correction dement for performing a forward error correction on the digital data stream.

8. The adaptor card of claim 1, further including means for performing packet framing on the demodulated signal.

9. The adaptor card of claim 1, further including means for performing address filtering to receive only predetermined addresses.

10. The adaptor card of claim 1, further including means for performing decryption on the received signal.

11. The adaptor card of claim 1, wherein the adaptor card is powered by a power supply of the personal computer.

12. The adaptor card of claim 1, further comprising a DC-DC converter connected to a power supply of the personal computer to provide power for an LNB element of the satellite communication network.

13. The adaptor card of claim 12, wherein the satellite communication network includes an interfacility link and wherein the power is provided from the DC-DC converter to the LNB element via the interfacility link.

14. The adaptor card of claim 13, wherein the interfacility link is a COAX L-Band interface.

15. The adaptor card of claim 12, wherein the DC-DC converter is connected to the tuner and supplies power to the tuner.

16. The adaptor card of claim 1, wherein the adaptor card fits in a card slot within a casing of the personal computer.

17. The adaptor card of claim 1, further comprising a microprocessor for controlling the operation of the tuner and the demodulator.

18. The adaptor card of claim 1, wherein the DC-DC converter comprises a plurality of voltage regulator elements including:

a first voltage regulator element, for converting the voltage signal into a first voltage signal providing power of a first voltage; and

a second voltage regulator element, for converting the voltage signal into a second voltage signal providing power of a second voltage.

19. The adaptor card of claim 18, wherein the first voltage is different from the second voltage.

20. The adaptor card of claim 1, wherein the DC-DC converter supplies power through the tuner to a LNB element.

21. A method for controlling an adaptor card for use in a personal computer, for enabling the personal computer to receive a signal from a satellite communication network, comprising the steps of:

receiving, by the adaptor card, a plurality of signals from the satellite communication network;

selecting, by the adaptor card, a signal from among the plurality of signals for reception;

converting, by the adaptor card, the signal into a digital data stream;

transmitting, by the adaptor card, the digital data stream, status information from a tuner of the adaptor card, and status information from a demodulator of the adaptor card to the personal computer via a bus interface; and

receiving a dc voltage signal from a power supply of the personal computer and converting the dc voltage signal into a plurality of dc voltage signals for providing power to the tuner.

22. The method of claim 21, further comprising the step of receiving, by the adaptor card, commands to the tuner and to the demodulator via the bus interface for controlling operation of the tuner and the demodulator in accordance with the status information of the tuner and the demodulator.

23. The method of claim 22, further comprising the steps of:

sweeping through a given bandwidth steps of a smaller bandwidth;

calculating at each step a signal quality factor for the received signal;

determining if the signal quality factor for the received signal is more desirable than previously calculated signal quality factors; and

saving the signal quality factor if it is more desirable.

24. The method of claim 21, further comprising the step of performing forward error correction, by at least one forward error correction element in the adaptor card, on the digital data stream.

25. The method of claim 21, further comprising the step of performing frame detection on the digital data stream.

26. The method of claim 25, wherein the step of performing frame detection further comprises the step of frame error detection.

27. The method of claim 21, further comprising the step of performing address filter to receive only signals addressed to one of a predetermined set of addresses.

28. The method of claim 21, further comprising the step of decrypting the digital data stream of the selected signal.

29. The method of claim 21, wherein the step of converting the voltage signal comprises:

converting the voltage signal, by a first voltage regulator element, into a first voltage signal providing power of a first voltage to the tuner; and

converting the voltage signal, by a second voltage regulator element, into a second voltage signal providing power of a second voltage to the tuner.

30. The method of claim 29, wherein the first voltage is different from the second voltage.

31. The method of claim 21, further comprising the step of supplying power through the tuner to a LNB element.