System and method to expand catv transmission spectrum using high frequency spectrum overlays

• US 20060053462A1
• Filed: 05/30/2002
• Published: 03/09/2006
• Est. Priority Date: 05/30/2002
• Status: Abandoned Application

• Current Assignee: Xtend Networks Ltd. (National Vision Holdings, Inc.)
• Original Assignee: Xtend Networks Ltd. (National Vision Holdings, Inc.)
• Inventors: Weinstein, Hillel, Strull, Yeshayahu, Orbach, Baruch, Albag, Yechzkel
• Application Number:
  US10/513,538
• Publication Number:
  US 20060053462A1
• Time in Patent Office: Days
• US Class Current: 725/126
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26
• CPC Class Codes: H04N 21/238 Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams hybrid fiber coaxial [HFC] networks for downstream channel allocation for video distribution H04L12/2801; flow control in packet networks H04L47/10; real-time communication protocols in data switching networks H04L65/00; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/2381 Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network transmission of MPEG streams over ATM H04L12/5601
• CPC Class Codes: H04N 21/6118 involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 7/10 Adaptations for transmission by electrical cable H04N7/12 takes precedence
• CPC Class Codes: H04N 7/106 for domestic distribution
• CPC Class Codes: H04N 7/17309 Transmission or handling of upstream communications

Abstract

A system and method for the expansion of the spectrum by the generation and introduction of high frequency spectrum overlays is disclosed. In an electronic content distribution system a plurality of input stream are combined at a head end into two combined signals having separate frequency band ranges. The signals are transmitted to the network and are dynamically combined into a single signal where the spectral composition of the signal is controlled by pre-defined parameters. The first signal carries a plurality of existing channels while the second signal could carry an additional set of channels. The second signal could carry spectral overlays generated from specific input streams the in accordance with pre-defined system parameters. The spectral overlays are selectively extracted from the second signal and introduced into the combined signal in the network in accordance with pre-defined subscriber-specific information.

Claims

1. In an electronic content distribution network a system for the expansion of the frequency spectrum by the selective generation and introduction of high frequency spectrum overlays, the system comprising the elements of:

an extended network head end unit to provide means for the processing of a plurality of input streams, means for the combining of the input streams into at least two separate combined signals, means for the transmission of the at least two combined separate signals to the continuance of the electronic content distribution network and means for controlling the at least one set top box device;

at least one extended hub station to receive the first combined signal and the second combined signal from the extended network head end, to combine the first combined signal and the second combined signal to at least one combined signal, and to amplify the at least one combined signal;

a first amplifying extended splitter devices placed before a line extender device to selectively amplify and process the constituent portions of the at least one combined input signal;

a second amplifying extended splitter device placed after a line extender device to selectively amplify and process the constituent portion of the at least one combined input signal;

at least one extended set top box to separate the at least one output signal into at least two output signals.

2. The system as claimed in claim 1 further comprises the element of at least one line extender device to amplify at least one portion of the at least one signal combined from the first input signal and the second input signal.

3. The system as claimed in claim 1 wherein the extended network head end comprises the elements of:

a first adder and radio frequency multiplexer device to combine a plurality of analog video streams, a plurality of digital video streams, and a plurality of data downstream streams into a first combined signal and separating a plurality of data upstream streams from the first combined signal;

a second adder and radio frequency multiplexer device to combine a plurality of digital streams into a second combined signal and separate a plurality of data upstream streams from the second combined signal;

a controller device to control the operation of the at least one set top box in accordance with pre-defined control parameters.

4. The system as claimed in claim 1 wherein the extended hub station comprises the elements of:

a mixer unit to combine the first combined signal and the second combiner signal into the at least one combined signal;

a first amplifying extended splitter to perform amplification of the second combined signal.

5. The system as claimed in claim 1 wherein the extended set top box comprises the elements of:

a second amplifying extended splitter to perform the amplification of the of the second combined signal;

at first triplexer unit including at least one low pass filter device and at least two band pass filter devices to separate the at least one combined signal;

a mixer unit to combine the separated portions of the at least one combined signal;

a micro-controller unit to control the operation of the mixer unit;

a second triplexer to separate the upstream portion of the at least one combined signal.

6. The system as claimed in claim 1 wherein the electronic content distribution network is a CATV distribution network.

7. The system as claimed in claim 1 wherein the electronic content distribution network is a cellular network.

8. The system as claimed in claim 1 wherein the at least one combined signal is modulated across an about 5 MHz to 1650 MHz.

9. The system as claimed in claim 1 wherein the first combined signal is modulated across an about 130 MHz to 860 MHz frequency range

10. The system as claimed in claim 1 wherein the first combined signal is modulated across an about 100 MHz to 550 MHz frequency range.

11. The system as claimed in claim 1 wherein the second combined signal is modulated across an about 5 MHz to 860 MHz frequency range.

12. In an electronic content distribution network a method for the expansion of the frequency spectrum by the selective generation and introduction of high frequency spectrum overlays, the method comprising the steps of:

at an extended electronic content distribution network head end combining a plurality of analog streams, digital streams and downstream data streams into a first combined signal modulated across an about a 50 MHz to 860 MHz frequency range;

at the extended electronic content distribution network head end combining a plurality of digital streams into a second combined signal modulated across an about 1 GHz to 3 GHz frequency range;

transmitting the first and the second combined signals downstream to an extended content distribution network hub station;

at the extended hub station frequency converting the first and second combined signal in order to create at least one combined signal across an about 150 MHz to 860 MHz frequency range;

transmitting the at least one combined signal downstream to at least one extended set top box installed at the premises of at least one subscriber;

thereby generating a downstream transmission spectrum of an about 150 MHz to 860 MHz frequency range that includes analog channels, digital channels and downstream data channels.

13. In an electronic content distribution network a method for the expansion of the frequency spectrum by the selective generation and introduction of high frequency spectrum overlays, the method comprising the steps of:

at an extended electronic content distribution network head end combining a plurality of analog streams, digital streams and downstream data streams into a first combined signal modulated across an about a 50 MHz to 860 MHz frequency range;

at the extended electronic content distribution network head end generating at least one spectrum overlay consisting of a plurality of digital channels in accordance with pre-defined control information by multiplexing the specific digital channels into a second signal modulated across an about 1 GHz to 3 GHz frequency range;

transmitting the first and the second combined signals downstream to the continuance of the electronic content distribution network;

determining at a pre-defined control node the desired combination of channels for a specific network subscriber and for a specific group of network subscribers;

selecting the at least one spectrum overlay in accordance with the result of the determination;

overlaying the first signal modulated across an about 50 MHz to 860 MHz frequency range with the selected spectrum overlay;

transmitting the resulting signal downstream to at least one extended set top box installed at the premises of at least one network subscriber;

thereby selectively generating at least one specific transmission spectrum including a pre-selected combination of analog channels, digital channels and downstream data channels to the at least one network subscriber.

15. The method as claimed in claim 15 wherein the combination of the channels included in the first signal is preserved in accordance with the control information.

14. The method as claimed in claim 15 wherein the at least one spectrum overlay is modulated across an about 500 MHz frequency band.

16. The method as claimed in claim 15 wherein an at least one upstream data portion of the at least one combined signal is suitably preserved to provide the for upstream signal traffic within the electronic content distribution network.

17. The method as claimed in claim 15 wherein the extended hub station provides power passing.

18. The method as claimed in claim 15 wherein the extended hub station splits the at least one combined signal to be transmitted to different branches of the network and to different subscribers.

19. In an electronic content distribution network a system for the expansion of the frequency spectrum by the selective generation and introduction of high frequency spectrum overlays, the system comprising the elements of:

an extended network head end unit to provide means for the processing of a plurality of input streams, means for the combining of the input streams into at least two separate combined signals, means for the transmission of the at least two combined separate signals to the continuance of the electronic content distribution network and means for controlling the at least one set top box device;

at least one extended hub station to receive the first combined signal and the second combined signal from the extended network head end, to combine the first combined signal and the second combined signal to at least one combined signal, and to amplify the at least one combined signal;

a amplification element placed in parallel to a line extender device to selectively amplify and process the constituent portions of the at least one combined input signal;

at least one extended set top box to separate the at least one output signal into at least two output signals.

20. The system as claimed in claim 19 further comprises the element of at least one line extender device to amplify at least one portion of the at least one signal combined from the first input signal and the second input signal.

21. The system as claimed in claim 19 wherein the extended network head end comprises the elements of:

a first adder and radio frequency multiplexer device to combine a plurality of analog video streams, a plurality of digital video streams, and a plurality of data downstream streams into a first combined signal and separating a plurality of data upstream streams from the first combined signal;

a second adder and radio frequency multiplexer device to combine a plurality of digital streams into a second combined signal and separate a plurality of data upstream streams from the second combined signal;

a controller device to control the operation of the at least one set top box in accordance with pre-defined control parameters.

22. The system as claimed in claim 19 wherein the extended hub station comprises the element of a mixer unit to combine the first combined signal and the second combiner signal into the at least one combined signal.

23. The system as claimed in claim 19 wherein the extended set top box comprises the elements of:

at first triplexer unit including at least one low pass filter device and at least two band pass filter devices to separate the at least one combined signal;

a mixer unit to combine the separated portions of the at least one combined signal;

a micro-controller unit to control the operation of the mixer unit; and

a second triplexer to separate the upstream portion of the at least one combined signal.

24. The system as claimed in claim 19 wherein the electronic content distribution network is a CATV distribution network.

25. The system as claimed in claim 19 wherein the electronic content distribution network is a cellular network.

26. The system as claimed in claim 19 wherein the first combined signal is modulated across an about 130 to 860 MHz frequency range

27. The system as claimed in claim 19 wherein the first combined signal is modulated across an about 100 MHz to 550 MHz frequency range.

28. The system as claimed in claim 19 wherein the second combined signal is modulated across an about 1 to 3 GHz frequency range.