Method and system for receiving and distributing satellite transmitted television signals

• US 5,073,930 A
• Filed: 10/19/1989
• Issued: 12/17/1991
• Est. Priority Date: 10/19/1989
• Status: Expired due to Term

• Current Assignee: Global Communications Incorporated
• Original Assignee: Global Communications Incorporated
• Inventors: Green, James A., Hearn, Brian F.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US07/423,146
• Time in Patent Office: 789 Days
• Field of Search: 358/86, 455/3, 455/6
• US Class Current: 725/69
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite

Abstract

A television distribution system includes a frequency agile satellite transponder down converter operating in the satellite block converted frequency range, typically 950-1450 MHz, along with an IF stage incorporating bandpass filtering and a frquency agile up converter. This arrangement allows a head-end configuration with optimum selection of transponders from one or more satellites and with both vertical and horizontal polarities. The transponders are converted to an available slot allowing twelve slots to accommodate transponders of preference. The block may then be distributed to multiple subscribers in apartment complexes, condominiums and subdivisions.

Claims

1. A satellite television signal distribution system comprising:

at least one satellite antenna receiving a block of signals transmitted by satellite, said block being disposed within a first frequency range;

selective signal frequency altering means coupled to said antenna for altering the frequency of selected signals within said received block without demodulating said selected signals so as to provide a further block of signals having an altered signal frequency distribution as compared to said received block of signals, said further block of signals being substantially disposed within said same first frequency range;

a distribution network coupled to said selective signal frequency altering means, said distribution network distributing said further block of signals to plural subscriber locations; and

plural satellite receiver means, located at corresponding said plural subscriber locations, for selecting signals within said distributed further signal block and for deriving, from said selected signals, a further signal capable of being processed by standard television receiver equipment.

2. A television signal distribution system including:

first satellite antenna means for receiving a first block of television signals transmitted by satellite;

second satellite antenna means for receiving a second block of television signals transmitted by satellite, said received second block of signals occupying a frequency range that is at least in part coextensive with the frequency range of said received first block of signals;

signal frequency mapping means coupled to said first and second satellite antenna means for frequency mapping selected signals from said first block of signals into a further block of television signals and for frequency mapping selected signals from said second block of received signals also into said further block of television signals without demodulating said selected signals;

a distribution network coupled to said signal frequency mapping means, said distribution network distributing said further block of television signals to plural subscriber locations; and

receiver means located at each said plural subscriber locations for selecting television signals within said further block and for deriving, from said selected television signal, a signal capable of being processed by standard home television equipment.

3. A system as in claim 2 wherein said frequency mapping means includes, for each of said received signals,

first converting means for converting said received signal from an original transponder signal frequency within a predetermined signal band to an intermediate frequency signal;

and

second converting means connected to receive said intermediate frequency signal for converting said intermediate frequency signal to a further transponder signal frequency within said predetermined signal band without demodulating said intermediate frequency signal.

4. A system as in claim 3 wherein said first converting means includes means for programming the difference between said original transponder signal frequency and said intermediate frequency in increments on the order of 1 MHz frequency steps so as to permit correction of signal frequencies of individual transponders.

5. A television distribution system including:

first satellite antenna means for receiving a first plurality of frequency modulated television signals from a first satellite;

second satellite antenna means for receiving a second plurality of frequency modulated television signals from a second satellite different from said first satellite;

signal frequency mapping means coupled to both said first and second satellite antenna means for mapping selected television signals from said first and second pluralities of received frequency modulated television signals into the same block of frequency modulated television signals without demodulating said selected signals;

a distribution network coupled to said signal frequency mapping means, said distribution network distributing said block of frequency modulated television signals to plural subscriber locations; and

plural satellite receiver means located at corresponding said plural subscriber locations for selecting one of said frequency modulated television signals within said block and for deriving, from said selected frequency modulated television signal, a further signal capable of being processed by standard television equipment,

wherein said frequency mapping means includes means for shifting the frequency of at least one of said received television signals from a first transponder channel within the range of 900-1500 MHz to a second transponder channel different from said first channel also within the range of 900-1500 MHz.

6. A system as in claim 5 wherein said frequency mapping means further includes means for shifting the frequency of at least a further one of said received television signals from a further transponder channel within the range of 900-1500 MHz to said same further transponder channel within the range of 900-1500 MHz.

7. A television signal distribution system including:

satellite antenna means for receiving a plurality of television signals from satellite;

signal frequency mapping means coupled to said satellite antenna means for mapping said plurality of received television signals into plural co-extensive frequency bands without demodulating any of said mapped signals;

plural distribution cables coupled to said signal frequency mapping mans for propagating said plural co-extensive frequency bands each on a respective distribution cable;

cable selecting means connected to said plural distribution cables for selecting one of said plural cables and for applying the signals propagated by said selected cable to a single subscriber drop cable; and

receiver means coupled to said subscriber drop cable for selecting a signal propagated by said selected cable and for deriving, from said selected signal, a further signal capable of being processed by standard home television equipment.

8. A system as in claim 7 wherein said satellite receiving means comprises a standard satellite receiving device of the type adapted for processing signals provided by said satellite antenna means.

9. A system as in claim 7 wherein said cable selecting means includes inhibiting means connected to receive a control signal originating at a location remote thereto for deselecting all of said plural cables in response to said control signal.

10. A system as in claim 7 wherein said satellite receiving means includes means for descrambling said selected signal.

11. A system as in claim 7 further including a line amplifier circuit for amplifying a frequency range of UHF RF signals propagating along one of said coaxial cables, said circuit comprising:

an input terminal coupled to said cable and receiving said signals;

tilt control means coupled to receive said range of signals for compensating for high frequency roll-off introduced by said coaxial cable and for providing a frequency compensated signal; and

level adjusting means, connected to receive said frequency compensating signal and also connected to receive a DC control level, for attenuating said frequency compensated signal by an amount responsive to said DC control level.

12. A television signal distribution system as in claim 7 wherein said receiver means comprises a standard conventional satellite receiver of the type adapted for converting satellite signals received from a satellite antenna into signals that can be readily processed by standard home television equipment.

13. A method of distributing satellite television signals comprising the following steps:

receiving a plurality of television signals from a satellite;

frequency mapping less than all of said received television signals into a block of television signals to be distributed to plural subscriber locations so as to eliminate undesired signals, including the step of altering the frequency of at least one of said received signals without demodulating any of said frequency mapped signals;

distributing said block of television signals to said plural subscriber locations over a distribution network;

selecting a television signal from said distributed television signals carried by said distribution network in response to a subscriber input; and

deriving, from said selected television signal, a further signal capable of being processed by standard home television equipment.

14. A method of receiving and distributing satellite signals comprising:

(a) receiving a first block of plural satellite-transmitted signals;

(b) receiving a further block of plural satellite-transmitted signals;

(c) frequency mapping selected signals from said first block into an output block of plural signals without demodulating said signals selected from said firs block;

(d) frequency mapping selected signals from said further block into said output block of plural signals without demodulating said signals selected from said further block; and

(e) distributing said output block of plural signals over a distribution network to plural subscriber receivers.

15. A method as in claim 14 wherein said first and further blocks of signals are at least in part co-extensive in frequency range.

16. A method as in claim 14 wherein said output block of signals is at least in part co-extensive in frequency range with at least one of said first and further blocks of signals.

17. A method as in claim 14 wherein said frequency mapping steps (c) and (d) each include the step of independently altering the frequency of selected individual signals without demodulating said selected individual signals.

18. A method as in claim 14 wherein said frequency mapping steps (c) and (d) each include the step of frequency converting selected individual signals plural times without demodulating said selected signals.

19. A method as in claim 14 wherein said frequency mapping steps (c) and (d) each include the steps of:

(i) converting a selected satellite transponder frequency signal from an original frequency to an intermediate frequency without demodulating said signal; and

(ii) further converting said signal converted by said step (ii) from said intermediate frequency to a frequency in proximity to said original frequency.

20. A method as in claim 19 wherein at least one of said converting steps (i) and (ii) includes the step of correcting for errors in said original frequency of said selected transponder frequency signal.

21. A system for receiving and distributing satellite signals comprising:

satellite signal receiving means for receiving first and further sets of plural satellite-transmitted signals;

first frequency converting means coupled to said satellite signal receiving means for converting the frequency of a first signal selected from said first set to an output signal frequency range without demodulating said selected signal;

second frequency converting means coupled to said satellite signal receiving means for converting the frequency of a further signal selected from said further set without demodulating said further selected signal; and

means coupled to said first and second frequency converting means for distributing said selected signals within said output frequency range over a signal distribution network to plural subscriber receivers.

22. A system as in claim 21 wherein said first and further satellite signals at least in part occupy a co-extensive frequency range.

23. A system as in claim 21 wherein said output range is at least in part co-extensive in frequency range with at least one of said first and second sets of satellite signals.

24. A system as in claim 21 wherein said first and second frequency converting means each include means for independently altering the frequency of selected individual signals.

25. A system as in claim 21 wherein said first and second frequency converting means each include means for frequency converting selected individual signals plural times without demodulating said selected signals.

26. A system as in claim 21 wherein said first and second frequency converting means each includes:

a first converting stage which converts a selected satellite transponder frequency signal from an original frequency to an intermediate frequency; and

a further converting stage substantially co-located with said first converting stage, said further converting stage further converting said signal converted by said first converting stage from said intermediate frequency to a frequency in proximity to said original frequency.

27. A system as in claim 26 wherein at least one of said first and further converting stages includes correcting means for correcting for errors in said original frequency of said satellite signal.

28. In a satellite distribution head end installation of the type which distributes signals received from satellite to at least one further location remote from said head end installation over a distribution network, an arrangement for preparing said received satellite signals for distribution over said distribution network, said arrangement including:

a first frequency converting circuit having an input coupled to said received satellite signals, said first frequency converting circuit converting a particular received satellite signal from a first frequency band to an intermediate frequency band without demodulating said particular signal;

a further frequency converting circuit connected to receive said intermediate frequency band signal, said further frequency converting circuit further converting said converted intermediate frequency band signal from said intermediate frequency band to a further frequency substantially within said first frequency band and for providing said further frequency signal at an output thereof without demodulating said particular signal; and

a signal distribution amplifier coupled to said further frequency converting circuit output for applying said further frequency signal to said distribution network for distribution to plural users.

29. In a satellite signal distribution system of the type which receives bands of signals transmitted by plural satellites and distributes said signals to plural user receivers via a distribution network, an arrangement for distributing only selected received satellite signals over said distribution network, said arrangement comprising:

plural signal processing means, one corresponding to each of said plural selected signals, each of said plural signal processing means being connected to said bands of signals received from said plural satellites, each of said plural signal processing means for altering the frequency of a corresponding selected satellite signal without demodulating said corresponding signal and for providing said altered frequency signal at an output thereof; and

a summing circuit coupled to the outputs of said plural signal processing means, said summing circuit applying said altered frequency signals to said distribution network for distribution to said plural user receivers.

30. An arrangement as in claim 29 wherein said plural signal processing means are each programmed such that said altered frequency signals have a frequency distribution which is different from an initial frequency distribution of said signals as received from said satellites.

31. An arrangement as in claim 29 wherein said plural signal processing means are programmed such that each said altered frequency signal has a different carrier frequency from other altered frequency signals.

32. An arrangement as in claim 29 wherein said signal processing means are programmed such that less than all of said received satellite signals are selected and undesirable received signals are not selected.

33. An arrangement as in claim 29 wherein each said signal processing means includes:

a frequency down converting circuit; and

a frequency up converting circuit,

at least one of said down converting circuit and said up converting circuit having a programmable local oscillator.

34. In a multi-user distribution network of the type including a satellite antenna for receiving signals from a satellite and a distribution network for distributing such received signals to plural user locations, a programmable signal selector/converter coupled to plural signals received from said satellite, said signal selector/converter selecting a single said satellite signal in response to programming and frequency converting said selected satellite signal for distribution over said distribution network to plural user receivers at said user locations, said selector/converter comprising:

a controller programmed with indicia of first and second frequencies;

a first conversion stage coupled to said controller for converting a selected satellite signal at said first frequency to an intermediate frequency without demodulating said selected signal; and

a second conversion stage, coupled to said first conversion stage and to said controller, for converting said selected signal from said intermediate frequency to said second frequency for distribution over said distribution network without demodulating said selected signal.