Signal selector and combiner for broadband content distribution
View Patent ↗In a satellite receiving system, program channels are selected from one or more broadband signals and combined with other selected channels and transmitted from a first unit, for example an outdoor unit, to a second unit, for example a gateway, server, or set-top box, using a single cable. Channels can be selected by digitizing the broadband signal then digitally filtering to isolate the desired channels. The outputs of several LNBs can be selected and combined into one signal. Multiple set-top boxes can receive independent signals over a single cable from the outdoor unit.
1. A signal distribution system for distributing a plurality of low noise amplifier and block converter (LNB) signals from a satellite outdoor unit (ODU) over a coaxial cable to an integrated receiver decoder (IRD) comprising:
a signal selector that receives a plurality of broadband LNB signals comprising a plurality of transponder signals, the signal selector is responsive to transponder select information transmitted by an IRD and selects a plurality of transponder signals from at least one broadband LNB signal based on the transponder select information;
a frequency translator coupled to the signal selector that is capable of shifting the selected transponder signals to new carrier frequencies to produce RF signals; and
a signal combiner coupled to at least one frequency translator capable of combining at least two RF signals to produce a composite signal;
wherein the modulation of the composite signal is the same as the modulation of the broadband LNB signals and wherein the composite signal is transmitted on the coaxial cable;
whereby the composite signal is transmitted to the IRD.
2. The signal distribution system of claim 1 further comprising a plurality of IRDs and wherein the composite signal is transmitted on a single cable connected to the ODU and all IRDs receive channels extracted from the composite signal.
3. The signal distribution system of claim 1 wherein the signal selector comprises an analog to digital converter and a digital filter.
4. The signal distribution system of claim 1 wherein the signal selector comprises a tuner.
5. The signal distribution system of claim 1 further comprising an integrated receiver decoder (IRD) connected to the coaxial cable with a plurality of tuners within the IRD, wherein each tuner within the IRD receives the composite signal and each tuner uses at least one transponder signal.
6. The signal distribution system of claim 1 wherein transponder select information is transmitted over the same cable as the composite signal.
7. The signal distribution system of claim 1 wherein transponder select information is transmitted over a wireless link.
8. A signal distribution system for distributing signals comprising a plurality of channels from a plurality of sources between a first unit and a second unit over a communication medium comprising:
means in the first unit responsive to information transmitted by the second unit for extracting selected channels from each of the plurality of sources and combining the selected channels into a composite signal without demodulating channels and without changing the modulation of the channels and transmitting the composite signal over the medium; and
means in the second unit for receiving the composite signal and demodulating and decoding at least one channel; and
means in the first unit and second units for bi-directionally communicating control information between the second unit and the first unit.
9. The signal distribution system of claim 8 wherein the control information comprises channel selection requests originating from the second unit and the control information comprises channel mapping information originating from the first unit.
10. The signal distribution system of claim 8 , further comprising a means in the first unit for carrier offset correction.
11. The signal distribution system of claim 8 wherein the first unit is a satellite outdoor unit and the second unit is a satellite integrated receiver decoder unit.
12. The signal distribution system of claim 11 wherein the communication medium consists of a single coaxial cable connected to the satellite outdoor unit.
13. The signal distribution system of claim 12 wherein the means for communicating uses the same communication medium as the composite signal.
14. A method of communicating a plurality of transponder signals from a satellite outdoor unit (ODU) that receives a plurality of satellite broadband signals to an integrated receiver decoder (IRD) over a single cable connected to the ODU, the method comprising the steps of:
communicating a transponder request signal to the ODU from the IRD;
in the ODU, selecting a plurality of transponder signals extracted from the received satellite broadband signals, wherein the selecting is responsive to the transponder request signals;
combining selected transponder signals into a composite signal;
transmitting the composite signal over the single cable from the ODU to the IRDs, wherein the modulation of the transponder signal is not altered by the steps of selecting, combining, and transmitting.
15. The method of claim 14 wherein the step of selecting a transponder signal comprises the step of: filtering a transponder signal with a band pass filter having a bandwidth ranging from 5% to 100% wider than the bandwidth of the transponder signal.
16. The method of claim 14 wherein the step of combining comprises frequency translating the selected transponder channels to a variable frequency before combining.
17. The method of claim 15 further comprising frequency translating the selected transponder channels to a predetermined frequency before combining.
18. The method of claim 14 further comprising the step of splitting the composite signal inside a home and distributing to a plurality of IRDs.
19. The method of claim 14 wherein the transponder request signal is transmitted over the cable from an IRD and all IRDs receive the same composite signal.
20. The method of claim 14 wherein the transponder request signal is transmitted over a wireless link to the ODU.
21. The method of claim 14 further comprising the steps of:
frequency translating the selected transponder channels to a variable frequency before combining; and
splitting the composite signal inside a home and distributing to a plurality of IRDs.
22. The method of claim 21 wherein the transponder request signal is transmitted over the cable from an IRD.
23. The method of claim 21 wherein the transponder request signal is transmitted over a wireless link to the ODU.