Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems
  • H04N7/22—Adaptations for optical transmission
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
  • H04N21/61—Network physical structure; Signal processing
  • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
  • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite

Definitions

• This invention is related to television, satellite repeaters, community access cable networks and use thereof, also to receiving, preparing, converting, transferring, and distributing video and audio data.
• this invention is related to receiving and transmitting television satellite signal from one or several central signal sources (satellite dishes) to one user or to a multitude of users.
• Television is distance redirection of images of moving or non-moving objects by means of wired or radio communication.
• the main components for image transfer are television transmission camera, transmitter, sending antenna, communication channel, receiving antenna, TV set (or other receiver).
• signals e.g., television, satellite, etc.
• Production, processing, sending and receiving of these signals are among the key issues for modern research aimed not only at achieving the best possible technical characteristics of the signals, but also at ensuring the best possible signal quality, more convenient, simpler and economical use / distribution of television and / or satellite signal with regard to the end user point.
• Optical network distribution systems have recently started to be used.
• One of the reasons for this is that optical cable features significantly lower damping than coaxial cable does, for example, the Dutch patent NL9101040 published on 18 January 1993 is known.
• the principle of this invention is optical system for signal transmission, where cable television 45-850 MHz signal and satellite 0.9-2 GHz signal are transmitted along with low-frequency 0.3-3 KHz telephone signal.
• Optical multiplexing means are used for transmission of the signals.
• the shortcoming of such a system is that the proposed solution cannot be used for transmission and distribution of satellite signal when the signal must be received and distributed from several different satellite dishes.
• German patent DE4334440 published on 13 April 1995. It offers a solution where before being transmitted to coaxial network the signal is converted to lower frequency and only then it enters the coaxial network. Such a solution reduces losses sustained at high frequency in coaxial network and enables long-range transmission of signal of rather high quality.
• it is always sought to maximise the frequency of the signal being transmitted, and along with increases in frequency of the signal being transmitted the damping increases as well and this limits the distance of data transfer.
• all signals in the frequency band which coincide at the receiving side, are converted and arranged in consistent succession thus making a single broadband signal.
• this signal is transmitted to optical converter and via optical cables it reaches individual users, where it is converted again, from optical signal to electric one. Afterwards this signal is passed directly to a radio or television receiver, or is appropriately converted and passed to other receivers.
• the problem with this invention is that the system cannot serve several satellite dishes simultaneously.
• the satellite signal distribution system described in this patent has a base station with an optical transmitter that receives a combined signal made up of satellite and television signals; it also has a number of optical signal receivers and distribution devices.
• the main disadvantage of this system is that the system is not capable of transmitting and distributing multiplexed satellite signal. Furthermore, the system does not provide for remote procedure for antenna selection and signal connection.
• the aim of this invention is a community access system for distribution of signals from satellite dishes, which would deliver a more convenient, better quality, and more compact solution compared to the currently available ones that are based on coaxial networks.
• a community access system for distribution of signals from satellite dishes is created, which consists of:
• a satellite dish capable of (designed for) receiving from satellite repeater a high frequency packed (or unpacked) signal in 0.95-6.00 GHz (or different) range;
• E/O modulators receiving the said high frequency signal(s) from one satellite dish or multiple satellite dishes and converting these signals into optical signals of certain wavelength (e.g., 1310 nm, 1550 nm, etc.);
• a multiplexer of the said optical signals which combines all optical signals of different wavelengths and transmits them to one optical cable (or several optical cables);
• an optical network made up of one optical cable or a multitude of optical cables carrying all received and prepared such high frequency signals (from many satellite dishes) in the form of an optical signal over long distances;
• optical demultiplexer one optical demultiplexer per each optical cable demultiplexing the said one optical signal into a packet of optical signals of different wavelengths, where each component of the packet matches its satellite dish;
• optical-electric (O/E) modulators (converters) receiving the said components of the packet and converting them to respective electric signals that after the O/E modulators enter the network of coaxial cables;
• a commutation matrix network made up of one or more commutation matrixes (commutators) that transmit all the said packed high frequency signal to appropriate unpackers;
• a satellite television receiver that enables selection of a respective satellite dish, vertical or horizontal polarisation, and upper or lower range signal, and transmission of it to a respective output device (e.g., a TV set).
• a respective output device e.g., a TV set
• optical networks enable transmitting signals hundreds of times farther under the same external conditions
• the system is capable of distributing both multiplexed (packed) and non-multiplexed conventional signal of satellite dishes;
• each user of the system can connect to the common terrestrial television antenna and to one of a multitude of satellite dishes;
• both passive and active optical distribution network can be used in the system
• optical network featuring very low signal damping is used for signal distribution
• satellite television set-top box can control and connect to any dish, choose signal polarisation as well as upper and lower range by DiSEqC protocol commands;
• the system uses controllable frequency unpackers
• This system is compact, safe, reliable, user-friendly, and easy to install.
• Fig. 1 gives a flowchart of the system for distribution and community access of signals from satellite dishes, which reveals the matter of the invention.
• Fig. 2 gives one of the implementation options for this invention, which is adapted for four signals of satellite dishes and for four users of the distribution network of these signals.
• Fig. 3 gives a typical version of packed frequency signal in the system input cable (Fig. 1 pos. 2).
• Fig. 4a-4d show spectrum of unpacked signal in the output cable (Fig. 1 pos. 16).
• Fig. 5 displays one of the choices for implementation for controllable frequency unpacker.
• Fig. 6 presents the system for distribution and community access of signals from satellite dishes, which offers analogue terrestrial television distribution capability and reveals the matter of the invention.
• Fig. 7 presents the system for distribution and community access of signals from satellite dishes, which offers digital terrestrial television (DVB-T) signal distribution capability and reveals the matter of the invention.
• DVD-T digital terrestrial television
• Fig. 8 illustrates one of the packing options for satellite dish signals, which uses three heads of type Quattro (three Quattro LNBs).
• Fig. 9 displays three signal packer diagram intended for packing of three output signals of a Quattro LNB.
• Fig. 10 shows three signal, which correspond to output signal of a Quattro LNB, unpacker diagram.
• Fig. 11 displays another packing option for satellite dishe signals, which uses three Whole Band LNBs and one Quattro LNB.
• Fig. 12 shows two signal packer diagram intended for packing of two output signals of a Quattro LNB.
• Fig. 13 presents Whole Band LNB output signal spectrum.
• Fig. 14 depicts unpacking option for satellite dish signals, which uses three Whole Band LNBs and one Quattro LNB.
• Fig. 1 shows the matter of the invention: the system for distribution and community access of signals from satellite dishes, made to receive video / audio signal from several different satellite dishes, process it and send to optical network enabling long-range (up to 10 kilometres) transmission of the signal with no need for amplification by appropriate devices in the end user's network.
• the said system for distribution and community access of signals from satellite dishes consists of a satellite dish (1), coaxial cable (2), electric-optical modulator (3), optical cable (4), shared multiplexer of optical waves (5), shared optical distribution and community access network (6), optical demultiplexer (7), connecting optical cables (8), optical-electric modulators (9), connecting coaxial cables (10), commutation matrix (11) with N inputs and W outputs, connecting coaxial cables (12), frequency unpackers (13), one block of heterodynes (14), set of heterodyne signals (15), connecting coaxial cables (16), satellite television receiver (17), and broadband terminals (18).
• a satellite dish (1) The purpose of a satellite dish (1) is to receive 10.7-12.75 GHz V and H polarisation signals from a satellite repeater and convert these signals by using an LNB in a satellite dish (1).
• An LNB usually converts the signals it receives to lower frequency range.
• Quattro LNB outputs the entire received spectrum via four coaxial outputs, each output can cover the 0.95-2.15 GHz range.
• Whole band LNB outputs the entire received spectrum via one coaxial output, the output can cover the 0.95-6.00 GHz (Fig. 3) or 0.95-5.45 GHz (Fig. 13) range.
• the multiplexed optical signal then enters the shared optical distribution and community access network (6).
• the optical signal can be split, coupled, strengthened, etc.
• remote signal distribution devices which may be more than one.
• a remote device contains the following system functional units / modules: optical demultiplexer (7), optical-electric modulator (9), commutation matrix (11) with N inputs and W outputs (when N is number of satellite dishes and W is number of satellite receivers users have (17)), frequency unpacker (13), and one block of heterodynes (14).
• optical demultiplexer (7) From the shared optical distribution and community access network (6) the optical signal goes to optical demultiplexer (7) where filters of different wavelengths split it into optical components (rays) of different wavelengths, with each component (ray) matching its satellite dish (1). Then the optical components (rays) enter appropriate optical cables (8) which run to appropriate optical-electric modulators (9).
• the purpose of an optical-electric modulator (9) is to demodulate light signal and recreate high frequency signal that equivalent to the signal supplied to a laser of corresponding wavelength in the signal production part.
• the connecting coaxial cable (10) is used to pass the packed high frequency signal to commutation matrix (11).
• the commutation matrix (11) transmits the entire packed high frequency signal to appropriate frequency unpackers (13).
• Frequency unpackers (13) are characterised by use of one block of different or variable frequency heterodynes (14), which is common to all mixers and which makes the required set of heterodyne signals (15).
• Each satellite signal receiver controls a commutation matrix (11) and appropriate frequency unpacker (13) and uses these to connect a signal source (dish) and determine the frequency band of the unpacker.
• the satellite television receiver (17) enables choosing the signal of a respective satellite dish and transmitting this signal to a respective output device (such as a TV set) by controlling a commutation matrix (11) and frequency unpackers (13).
• Broadband terminals (18) are necessary to make it possible to connect additional user devices that distribute signal.
• This system for distribution and community access of signals from satellite dishes (this solution) is characterised by that it does not require cumbersome and hard to install coaxial networks. It also enables long-distance transmitting of signals even without amplification. In addition, compactness, simplicity, and convenience of the system make it particularly attractive to an end user.
• Fig. 2 presents a specific option of implementation of this invention, tailored for four signals of satellite dishes and for four users of common network for these signals. It also gives detailed information on possibility to distribute packed radio frequency by using broadband terminals (18) and a four-user additional device for signal distribution (19).
• Fig. 3 contains a typical occurrence of packed frequency signal in the input cable of the system (Fig. 1, pos. 2). Having travelled through the optical cable such a signal enters a frequency unpacker (Fig. 1, pos. 13).
• a satellite television signal consists of several wavebands:
• Fig. 4 a ⁇ d show spectra of unpacked signal in output cable (Fig. 1, pos. 16).
• Unpacked waveband of satellite television is dependent on settings in the frequency unpacker (13). The choice of frequency band depends on DiSEqC command transmitted by the satellite receiver and entering the unpacker. The following wavebands are available:
• Fig. 4a vertical polarisation lower band 950-1950 MHz
• Fig. 4b vertical polarisation higher band 1100-2150 MHz
• Fig. 5 shows one of the possible choices for implementation of controllable frequency unpacker (13), which uses two mixers and two heterodynes and is intended for reconstruction of signal of required band from shared multiplexed signal (12) the type of which is revealed in Fig. 3.
• Frequency band selection is performed using controllable keys S.
• keys S1 and S2 are closed, the mixers C1 and C2 are not in use and vertical polarisation lower band 950-1950 MHz is obtained at output of frequency unpacker (13) (Fig. 4a).
• key S1 is open and key S2 is closed the first mixer C1 starts operating, then a horizontal polarisation lower band 950-1950 MHz is obtained at output of frequency unpacker (13) (Fig. 4c).
• Fig. 6 provides a system for distribution and community access of signals from satellite dishes, which reveals the matter of the invention and offers a possibility to distribute analogue terrestrial television. It shows one of the possible methods to insert the analogue and digital terrestrial television signal TV + DVB-T (21) into the distribution network when additional optical cable is used. To implement this method additional devices are used: optical transmitter with ⁇ tv wave laser, optical receiver, radio signal splitter (19) and diplexers (20). The drawing shows CATV input intended for connecting the bidirectional data transmission system of cable television.
• Fig. 7 illustrates a system for distribution and community access of signals from satellite dishes, which reveals the matter of the invention and offers a possibility todistributedigital television. It proposes a flowchart of distribution of digital (DVB ⁇ T) television signal, which uses one of the SAT television broadcast channels. In this case there is no need for additional optical cable, however, it is necessary to add radio signal (RF) diplexer (22) to the transmission section and analogous diplexer (23) to the reception section.
• RF radio signal
• Fig. 8 gives one of the options for packing signals from satellite dishes.
• the drawing shows an option for generation of packed signal when Quattro LNBs are used for receiving satellite signal.
• Packers (24) are used for signal generation.
• Fig. 9 presents a three signal packer diagram. It proposes a device for packing overlapping wavebands (24), which is intended for the above-mentioned arrangement.
• the three LNB signals with waveband of 950 ⁇ 2150 MHz, which enter the block, are arranged in common 950-5450 MHz waveband in the device output.
• Fig. 10 illustrates a three signal unpacker diagram.
• the drawing shows appropriate frequency unpacker (13) and a block of heterodynes (14). The difference is that two heterodynes with frequencies of 4650 MHz ir 6400 MHz are used.
• Fig. 11 presents yet another option for implementation of packing of signals from satellite dishes.
• the drawing shows how to additionally connect a Quattro LNB to Whole Band LNBs the spectrum of which is portrayed in Fig. 13. To achieve this, a two signal packer is used (25).
• Fig. 12 shows a packer diagram for two input signals.
• the drawing proposes a frequency band multiplexer (25).
• the Quattro LNB signals of two outputs, with waveband of 950 ⁇ 2150 MHz, which enter the block, are arranged in common 950-5450 MHz waveband in the device output.
• the advantage of this proposal is that the receiving LNBs of two types with different frequency packed signals can use the same unpacker.
• Fig. 14 presents an option of satellite dish signal unpacker (13) where LNBs of two different types ('Whole band' and 'Quattro') are used in the system for distribution and community access of signals from satellite dishes.
• Unpacker (13) that consists of two mixers and three heterodynes is intended for reconstruction of signal of required band from the spectrum of multiplexed signals the type of which is shown in Fig. 12 and Fig. 13.
• Frequency band selection is performed using controllable keys S. When keys S1 and S2 are closed, the mixers C1 and C2 are not in use and vertical polarisation lower band VL is obtained at output of frequency unpacker (13) (Fig. 13) or band 1 (Fig. 12).

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• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Radio Relay Systems (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46582031

Family Applications (1)

Country Status (2)

Citations (8)

• 2011
  • 2011-06-23 LT LT2011059A patent/LT5902B/lt not_active IP Right Cessation
• 2012
  • 2012-06-22 WO PCT/IB2012/053168 patent/WO2012176164A1/en active Application Filing

Patent Citations (8)

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