Granted Patent B2

US 8,582,641 · App. 12/074,949 · Granted Nov 12, 2013

Abstract

Claims (38)

1. A control unit for use in satellite distribution apparatus, said control unit comprising:

means for allowing a plurality of received digital broadcast signals to be selected at an RF input;

means for allowing the bandwidth of said selected signals to be compressed and rearranged for transmission onto a single cable outlet; and

signal symbol stacking means to receive symbols associated with said selected signals from a signal demodulator;

at least one filter, a digital to analogue converter (DAC) and a modulator through which new symbols output from the signal symbol stacking means pass to an RF output such that the RF output bandwidth is reduced by a factor of m compared with the RF input, where m is the number of symbols within the stack generated by the signal symbol stacking means;

wherein the signal symbol stacking means rearranges the compressed signal by remapping said signal symbols; and

wherein the new symbol is a weighted summation of “m” symbols.

2. A control unit according to claim 1 wherein for every ‘n’ symbol received by the signal symbol stacking means, said means generates a new symbol at 1/n of the received symbol rate, where ‘n’ is an integer.

3. A control unit according to claim 2 wherein n=4 for digital video broadcast satellite (DVBS) signals.

4. A control unit according to claim 2 wherein n=3 for digital video broadcast satellite 2 (DVBS 2 ) signals.

5. A control unit according to claim 1 wherein at least part of the means for compressing said selected digital broadcast signals also includes base band shaped filtering means.

6. A control unit according to claim 1 wherein the signal symbol stacking means rearranges the compressed signal by scaling said signal symbols.

7. A control unit according to claim 6 wherein the scaling includes scaling a first symbol V1 by a factor ‘C’ and adding the scaled first symbol to a second symbol V2 to provide a newly scaled vector O1 =C×V1+V2.

8. A control unit according to claim 1 wherein the signal symbol stacking means rearranges the compressed signal by scaling and remapping said signal symbols.

9. A control unit according to claim 1 wherein the signal stacking means uses one or more channel cards to allow a plurality of selected digital broadcast signals to be combined and compressed to form a single output signal.

10. A control unit according to claim 1 wherein back channel communication means are provided with the control unit to allow communication between a device receiving the compressed rearranged signals and the control unit.

11. A control unit according to claim 1 wherein the control unit can operate in at least two different modes including a broadcast mode and a frequency translation module mode.

12. A control unit according to claim 10 wherein carousel data and/or media access control (MAC) messages are fed back to the control unit via the back channel communication means.

13. A control unit according to claim 1 wherein signal distribution means are provided for distributing a plurality of cable feed signal inputs from a satellite to one or more channel cards provided in the control unit.

14. A control unit according to claim 1 wherein diplexing means are provided for diplexing the signal prior to outputting the rearranged signal to a single cable outlet.

15. Satellite distribution apparatus for distributing digital broadcast signals in a pre-determined locality or building, said apparatus comprising:

satellite receiving means for receiving broadcast signals from at least one satellite;

communication means for transmitting the received signals to a control unit in the locality or building, said control unit allowing a plurality of received digital broadcast signals to be selected and output onto a single cable for distribution around said locality or building;

means for allowing the bandwidth of the selected signals from an RF input to be compressed and rearranged for transmitting onto a single cable RF outlet; and

signals symbol stacking means to receive symbols associated with said selected signals from a signal demodulator;

at least one filter, a digital to analogue converter (DAC) and a modulator through which new symbols output from the signal symbol stacking means pass to an RF output such that the RF output bandwidth is reduced by a factor of m compared with the RF input, where m is the number of symbols within the stack generated by the signal symbol stacking means;

wherein the signal symbol stacking means rearranges the compressed signal by remapping said signal symbols; and

wherein the new symbol is a weighted summation of “m” symbols.

16. Apparatus according to claim 15 wherein conversion means are provided in locality or building for receiving the rearranged compressed digital signals and reconfiguring said signals back to the original configuration for processing by broadcast receiving means.

17. Apparatus according to claim 16 wherein the adaptor is powered from an LNB power supply of the broadcast receiving means.

18. Apparatus according to claim 15 wherein the conversion means are provided in the broadcast receiving means.

19. Apparatus according to claim 15 wherein the conversion means are provided in the form of an adaptor for use with broadcast receiving means.

20. A method of compressing digital broadcast signals, said method comprising:

selecting a plurality of received digital broadcast signals at an RF input;

compressing and rearranging the bandwidth of said selected signals for transmission onto a single cable RF outlet, and wherein at least part of the step for compressing said selected digital broadcast signals includes a signals stacking means to receive symbols associated with said selected signals from signal demodulation means, and wherein at least one filter, a digital to analogue converter (DAC) and a modulator through which new symbols output from the signal symbol stacking means pass to an RF output such that the RF output bandwidth is reduced by a factor of m compared with the RF input, where m is the number of symbols within the stack generated by the signal symbol stacking means;

wherein the signal symbol stacking means rearranges the compressed signal by remapping said signal symbols; and

wherein the new symbol is a weighted summation of “m” symbols.

21. A method according to claim 20 wherein the method of decompressing the digital broadcast signals uses signal symbol destacking means in a reverse process to the signal symbol stacking means.

Assignments (7)