Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems
  • H04N7/10—Adaptations for transmission by electrical cable
  • H04N7/108—Adaptations for transmission by electrical cable the cable being constituted by a pair of wires
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems
  • H04N7/10—Adaptations for transmission by electrical cable
  • H04N7/106—Adaptations for transmission by electrical cable for domestic distribution

Definitions

• the present invention relates to a distribution or transmission system for audio / video and / or TV signals intended for the production of images or sounds on a TV, audio and / or video receiver.
• the present invention will firstly be concerned with the distribution of video signals from internal sources, and then with video signals from external sources.
• the purpose of the transmission system of the present invention is to use a preexisting twisted pair network for the transmission of audio and / or video signals from internal sources, but also from external sources.
• the present invention provides an audio / video signal distribution system, comprising audio / video signal sources and audio / video signal receivers, and a central unit.
• processing and multiplexing system characterized in that it comprises a twisted pair service network for routing audio / video signals from the sources to the central processing and multiplexing unit and a twisted pair distribution network for routing the multiplexed audio / video signals from the processing and multiplexing unit to the receivers.
• Two distinct twisted pair networks are therefore used to on the one hand make the signals from the sources go up to the central processing and multiplexing unit on a network and on the other hand to bring the processed multiplex signals back down to the receivers on the other network.
• the system comprises means for inputting control signals which can be routed over the network of control signals.
• the system comprises socket means on which the signal sources can be connected to send audio / video signals and to receive control signals over the service network.
• the system comprises input modulators respectively associated with the socket means for modulating the signals to be routed over the service network.
• the system comprises coaxial cable sockets on which a coaxial cable for connection to a TV receiver is connectable.
• the system includes adapters respectively associated with the coaxial sockets to adapt a processed signal from the distribution network to be routed over a coaxial cable.
• the central unit comprises multiplexing means for multiplexing the control signals on the service network and for multiplexing the audio / video signals modulated on the distribution network.
• the central unit comprises a processing unit for processing the multiplexed modulated signals from the service network so as to route them over the distribution network.
• a processing unit for processing the multiplexed modulated signals from the service network so as to route them over the distribution network.
• the source sought As soon as the source sought has received and recognized the control signal, it transmits in response an audio / video signal which is processed at its associated input modulator so that it can be sent over the twisted pair network for service up to '' to the central processing and multiplexing unit which, after multiplexing and processing, sends it over the entire distribution network and to the output modulator with which the coaxial socket of the selected TV receiver is associated, which is connected by means of a coaxial cable.
• the chain is thus closed.
• the advantage of this distribution or transmission system lies in the use of two preexisting twisted pair networks, the twisted pairs of which are used to carry the control signals and the modulated video signals over a network and to return the processed multiplexed signals over the network. other network.
• the central processing and multiplexing unit forms a network node connected to a pre-existing cable network of pairs of twisted wires.
• the system comprises processing means for individually processing the modulated signals originating from the service network before routing them to the multiplexing means.
• the multiplexing means multiplex the control signals from the service network to reinject them onto the service network.
• control signal input means comprise a wave receiver associated with a remote control.
• the system includes boxes integrating the input modulators respectively associated with the socket means for modulating signals from the sources, the output adapters respectively associated with the coaxial sockets for adapting the signal from the distribution network , the input means of control signals routable on the service network, the socket means on which the signal sources can be connected to send audio / video signals and receive control signals on the service network, the sockets coaxial cable on which a coaxial cable connecting to a receiver is connectable, and means for connection to the distribution network and to the service network.
• the distribution network and the service network are formed by a single pre-existing network of cables of twisted pairs of wires.
• This audio / video signal transmission system can thus be summarized as a set of boxes and a central unit integrating processing and multiplexing means.
• Each box is associated with a specific receiver while the central unit is common to all the boxes.
• Each box is connected to an outlet on the network of cables of pairs of pre-existing or pre-wired twisted wires, as is the central unit at the other end of the network in the technical room.
• Each box is thus connected to the pre-existing twisted pair network using a cable for twisted pair wire connection, but it is also connected to the receiver using a conventional connection cable and to the source of signals using a specific cable which can, among other things, be of the SCART / RJ45 or also RJ45 / RJ45 type.
• the audio / video signal transmission system of the invention can also accept external signal sources.
• the multiplexing means can also be connected to external sources of audio / video signals subsequently processed in the processing unit to be routable over the distribution network.
• the external sources include antennas and / or satellite terminals.
• a control signal can be entered into the service network up to the multiplexing means which will multiplex the control signal over the entire service network.
• the external source delivers a video or audio signal which is first multiplexed and then processed in the processing unit so that it can then be routed over the distribution network to the output adapter with which the socket is associated.
• coaxial cable which is connected to the receiver using a conventional coaxial connection cable.
• the system can thus be summarized as a set of boxes as defined above and a central multicast unit.
• the central unit is thus connected to the network of pre-existing twisted pairs which serves as a branch to reach the boxes which are installed near a weak current outlet installed in the room where the dedicated receiver is located.
• FIG. 1 is a diagram illustrating the implementation of a transmission system according to the invention in a room or a house composed of four rooms each equipped with a TV receiver,
• FIG. 2 is a diagram of the housing used in the present invention
• FIG. 1 illustrates an application of the transmission system of the invention in a residential or office space composed of four rooms referenced PI to P4. In the present case, it is rather a dwelling for domestic use, in which the room PI can be the living room, and the rooms P2, P3 and P4 of the bedrooms for example.
• This house has a network of cables of twisted wire pairs PT which extends into each room PI to P4.
• FIG. 1 illustrates an application of the transmission system of the invention in a residential or office space composed of four rooms referenced PI to P4. In the present case, it is rather a dwelling for domestic use, in which the room PI can be the living room, and the rooms P2, P3 and P4 of the bedrooms for example.
• This house has a network of cables of twisted wire pairs PT which extends into each room PI to P4.
• FIG. 1 illustrates an application of the transmission system of the invention in a residential or office space composed of four rooms referenced PI to P4. In the present case, it is rather a dwelling for
• this pre-wired or pre-existing network is constituted by the cables of pairs of twisted wires PT located outside the rooms PI to P4 and reaching inside the rooms at the level of sockets RI to R4 , which can for example be in the form of RJ45 type sockets.
• the cables of twisted pairs PT arrive for example in a technical room (not shown).
• a cable of pairs of twisted wires consists of four pairs of twisted wires.
• two pairs of wires will be used, namely a so-called “service” pair for routing control signals and upstream audio / video signals, and another so-called “distribution” pair for routing downlink audio / video signals.
• Each room is equipped with a TV receiver referenced TV1 to TV4 with which is associated a remote control TC1 to TC4, which may for example be of the infrared emission type.
• a remote control TC1 to TC4 which may for example be of the infrared emission type.
• audio receivers such as HIFI channels.
• Each part is also equipped with a housing B1 to B4, the details of which are shown in FIG. 2.
• the boxes Bl to B4 can be identical.
• Each box comprises on the front a weak current socket of the RJ45 type, a coaxial socket F and a RIR wave receiver for example of the infrared type.
• the box On the rear face, for example, the box includes connection or connection means CPT for connecting a cable of pairs of twisted wires PT.
• the RJ socket is connected to the CPT connection means via an MDL modulator.
• the coaxial socket F is connected to the CPT connector by means of an adapter / balun which can for example be a balun.
• the RIR receiver it is connected to the CPT connector via a PIR wave processing unit.
• the MDL modulator is furthermore provided with RC adjustment means making it possible to adjust the channel of the signal injected at the level of the RJ socket.
• the RJ socket is directly connected to the CPT terminals by a twisted pair.
• the CPT terminals of the boxes Bl to B4 are connected to the respective socket RI to R4 by means of a twisted pair cord PT.
• the various boxes Bl to B4 are connected to the network of twisted pairs pre-wired or preexisting.
• the control signal received by the RIR receiver is connected to a terminal of the CPT which is connected to the service network.
• the BL balun is connected to the PD distribution network, while the modulator and the direct line from the RJ socket are connected to the PS service network.
• each receiver TVl to TV4 is connected to its respective box Bl to B4 by means of a coaxial cable CX which is connected at the level of the socket.
• the PI room is also equipped with an MGT video recorder which is connected to the TVl receiver using a scart cable.
• the MGT video recorder is also connected to the Bl box at the RJ socket by means of a SCART-RJ45 connection cord.
• Room P2 is equipped with a DVD player connected to the TV2 receiver using a SCART cable.
• the DVD player is also connected to the B2 box using a SCART-RJ45 connection cable.
• the room P3 is equipped with a camera C which is connected to the box B3 at the level of the RJ socket by means of a connection cord made up of pairs of twisted wires.
• Room P4 includes only the TV4 receiver and the B4 box
• the present application mode implements three internal sources of audio / video signals, it is of course feared to provide even more sources, the number of which is limited only by the ranges available on the map. frequency.
• the source channels can be adjusted using the adjustment means associated with the MDL modulator.
• the remote controls TC1 to TC4 are universal remote controls capable of controlling both the receivers TV1 to TV4 as the video recorder, the DVD player and the camera C.
• the receivers TV1 to TV4 as well as the video recorder, the DVD player and the camera C are thus connected via the respective boxes Bl to B4 and the connection cables PT to the sockets RI to R4 of the network of cables of twisted pairs of wires.
• PT which is here divided into a service subnet PS and a distribution subnet PD.
• This preexisting network extends outside the rooms PI to P4 as far as a technical room (not shown).
• the various network PT cables coming from rooms PI to P4 are connected or connected using a connection cable to a central multicast unit.
• This MDS unit integrates MX multiplexing means, which constitute network nodes which interconnect all the PS cables of the existing service network.
• This central broadcasting unit MDS integrates, in addition to the multiplexing means MX, several levels of signal processing which make it possible on the one hand to process the uplink signals coming from the service network and on the other hand the downlink signals coming from the central unit broadcast and fed back into the distribution network.
• a complete architecture of this central television broadcasting unit will be given below with reference to FIG. 4.
• a person in the room PI can of course operate the video recorder MGT using the remote control TC1 so that video signals will be transmitted to the receiver TV1 via the cord P.
• a person in the room P2 can operate the DVD player using the TC2 remote control to send out video signals to the TV2 receiver via the P cord. This is entirely conventional.
• a person in, for example, room P4 can use the universal remote control TC4 to send a control signal, for example a read signal, to the RIR receiver in box B4 to activate the MGT video recorder. found in the PI room.
• a control signal for example a read signal
• the processed control signal is sent to the connector CPT of the housing B4. From there, the control signal is sent over the service network in the connection cable PT to reach the connector R4 of the pre-existing network. From there, the control signal will go up the network, on a specially dedicated pair which is called “service pair”, to the central unit MDS where it arrives in specific multiplexing means mxs.
• the control signal is multiplexed on all the service pairs of the service network connecting the MDS box to the RI to R4 sockets. Arrived at the RI socket, the signal goes up by the connection cable PT to the housing Bl. After having reassembled the direct line in the housing Bl, the control signal goes up to the video recorder MGT by the connection cable PPT.
• the MGT VCR thus receives a playback command signal, and in response, the VCR begins playback.
• a video signal is thus emitted by the video recorder. Conventionally, this video signal is transmitted with a frequency called "baseband" of 12 MHz, which is not compatible with a transmission over a cable of twisted pairs of wires.
• the unit Bl integrates the MDL modulator whose function is to modulate the baseband video signal into a video signal capable of being transmitted without loss of characteristics of the original signal.
• the modulated video signal can be transmitted by the connection cord PT which connects the housing Bl to the socket RI. From there, the modulated video signal enters the twisted pair service network PS and goes up to the central unit MDS which integrates multiplexing means MX. From there, the modulated video signal is processed in an individual processing unit ut, then multiplexed with the other inputs from the service network, to then be sent to another central processing unit Ul which processes the signal in a substantially inverse manner compared to the unit ut. From the R4 socket, the video signal goes back to the B4 box at the level of the BL balun whose function is to adapt the signal impedance so that it can transmit it this time through the coaxial cable CX which connects the box
• a main function of the BL balun is to transform the impedance of the signal from 75 to 100/120 ohms.
• a person in room P4 can use his T4 TV receiver to view a cassette played by the MGT VCR in room PI.
• a person in room P2 can use the VCR in room PI.
• a person in room PI can use the DVD player in room P2. All combinations are possible.
• the spirit of the present invention is to use a network of preexisting twisted pair wire cables to route a control signal and modulated video signals over a service subnetwork and multiplexed modulated signals processed on a sub -distribution network.
• FIG. 3 illustrates an alternative application also involving external sources of audio / video signals.
• the central multicast unit MDS 'of FIG. 3 also integrates a processing stage UT composed of several individual processing units ut intended for the processing of signals going up the service network. Given that the service network is also used for raising control signals, the central unit MDS ′ also comprises means for multiplexing mxs of the control signals.
• control signals do not need specific processing, they are simply multiplexes at the level of the mxs multiplexing stage and reinjected directly into the service network PS to descend over the entire service network, and more particularly to the source concerned which will recognize the control signal.
• the processed uplink signals are injected into multiplexing means MX.
• MX multiplexing means
• the parabolic antenna PRB visible in Figure 3 is connected to the central multicast unit MDS 'which will re-inject the video signal received by the antenna PRB to the satellite terminals TS1 and TS2. This is visible in FIG. 4 where it is clearly seen that the antenna connected to the MDS 'unit is directly oriented along the service lines which connect to the two satellite terminals TS1 and TS2.
• the signals processed at the level of the satellite terminals TS1 and TS2 are then routed via the service line to the individual processing units ut which then send the processed signals to the multiplexing means MX. From there, all the signals previously processed and modulated are sent to the processing unit Ul whose function is substantially the opposite of that of the processing stage UT.
• the signals are amplified, pre-sloping, symmetrized, adapted in impedance so as to be able to reinject them without significant loss of transmission characteristics on the distribution network PD.
• the conventional rake antenna is directly connected to the processing unit Ul, together with the multiplex signals.
• the ANT antenna signal will simply be processed (amplified, pre-sloped, balanced, adapted in impedance, etc.) so that it can be routed without loss of transmission characteristics on the distribution network.
• the signal will be processed again to be able to route it over a coaxial cable connected to the receiver.
• Ul is injected a bouquet of signals each corresponding to a predetermined channel. The number of channels is only limited by the frequency plan.
• the present invention can thus materialize in a set of boxes B1 to B4 and an MDS or MDS 'box.
• the boxes are each connected to a socket on a pre-existing twisted pair network and the dedicated TV or audio receiver and any internal video or audio source are connected to each box.
• the MDS or MDS 'box it is connected to all the cables of the preexisting network, and integrates processing and multiplexing units to reinject the signals processed on the distribution network to the dedicated receivers.

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• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
• Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
• Closed-Circuit Television Systems (AREA)
• Color Television Systems (AREA)
• Details Of Television Systems (AREA)

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• 2001
  • 2001-09-25 FR FR0112533A patent/FR2830156B1/fr not_active Expired - Lifetime
• 2002
  • 2002-09-24 DE DE60239625T patent/DE60239625D1/de not_active Expired - Lifetime
  • 2002-09-24 EP EP02783203A patent/EP1436991B1/de not_active Expired - Lifetime
  • 2002-09-24 US US10/529,153 patent/US7685623B2/en not_active Expired - Fee Related
  • 2002-09-24 AT AT02783203T patent/ATE504163T1/de not_active IP Right Cessation
  • 2002-09-24 WO PCT/FR2002/003259 patent/WO2003028369A1/fr not_active Application Discontinuation
  • 2002-09-24 EP EP02783204A patent/EP1436992A1/de not_active Ceased
  • 2002-09-24 WO PCT/FR2002/003260 patent/WO2003028370A1/fr not_active Application Discontinuation
  • 2002-09-24 ES ES02783203T patent/ES2361300T3/es not_active Expired - Lifetime
  • 2002-09-24 US US10/529,053 patent/US7784075B2/en active Active

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