Classifications

• • 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]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
  • H04N21/4344—Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• • 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]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
  • H04L27/14—Demodulator circuits; Receiver circuits
• • 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]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
  • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
  • H04H20/63—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast to plural spots in a confined site, e.g. MATV [Master Antenna Television]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H40/00—Arrangements specially adapted for receiving broadcast information
  • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
  • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
  • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving

Definitions

• the present invention relates to a converter and to a method for converting digital signals received in modulated and multiplexed form, in particular satellite signals.
• Digital signals received from satellites are generally processed on reception by a reduced noise power supply, designated by LNB (for “Low Noise Block converter” or “Low Noise Blockdown amplifier”) or by LNC (for “Low Noise Converter ”).
• LNB Low Noise Block converter
• LNC Low Noise Converter
• This block located at the focal point of a satellite receiving antenna, is intended to convert the received signals by frequency reduction and to amplify them, before sending them to other systems.
• digital video signals are conventionally sent then to an antenna input of a set-top box receiver or STB (for "Set Top Box”), where they are subject to a frequency selection by tuning (or "tuning") ).
• LNBs convert part of the signals received into Ku band (and potentially, Ka or C band) into the L band (950 MHz - 2150 MHz).
• this technique has drawbacks when several digital decoders (STBs) or other television reception systems are used in a house or a building served by the satellite antenna equipped with this type of LNB. Indeed: - a classic LNB can only convert one of the four Band / Polarization combinations associated with a program that one wishes to receive; if two or more STBs must simultaneously receive programs transmitted on different combinations, then more sophisticated LNBs must be used, with a system of distributors / switches, and with cabling which quickly becomes complex when the number of STBs increases; - the signal transmitted by the LNB is located in a frequency band which is not always well supported (significant attenuation) by the distribution network of conventional TV signals (cable or wireless) present in houses or apartments; we must therefore either provide a satellite signal distribution network different from the cable / wireless signal network, or install better quality cables allowing all these signals to pass simultaneously.
• STBs digital decoders
• US Pat. No. 5,528,633 describes the combination of a radio frequency band tuner stage (also called a tuner) with a phase quadrature frequency conversion-down stage
• Downconverter quadrature in a single device.
• This device acts as an amplitude modulation tuner for transforming radio frequencies into a baseband, and is intended in particular to receive radio frequency signals from an LNB and convert them into signals in a desired digital format.
• the description specifies in particular that the digital data signals derived from any of the amplitude modulation formats can be supplied directly to a digital device as an output (col. 7, lines 41-44).
• This technique can be used to facilitate the adaptation of signals at the output of LNB, but it does not solve the difficulties linked to the presence of several STBs.
• WO-01/56297 relates to a home video distribution and storage system. It enables simultaneous wireless distribution of signals carrying satellite and Internet services to several televisions in a house.
• a master set-top box or STB (for “Set Top Box”) connected to external antennas provided with LNBs is provided for transmitting radio signals to TV receivers.
• the master STB includes a radio frequency (RF) switch box from upstream to downstream, TV tuners, demodulators and demultiplexers for MPEG 2 (for “Moving Picture Experts Group”) or IP (for “Internet Protocol”) program streams ). It also includes a multiplexer of these streams for access to home TV receivers, via local antennas and slave STBs, as well as a converter to a wireless protocol, such as for example IEEE 802.11 or Hiperlan2.
• This protocol can be developed specifically for an application, for example by using a MAC protocol (for “Medium Access Control”) to take advantage of a particular RF modulation scheme.
• a disadvantage of the techniques disclosed in this document is that they require specific terminals, adapted to the wireless protocol used in a given home network, and that they are only fully effective with an appropriate RF modulation scheme.
• the present invention provides a converter of digital satellite signals received in modulated and multiplexed form, which makes it possible to take into account several receivers simultaneously, in a manner which can be reliable and particularly flexible.
• the converter of the invention can in particular make it possible to take into account in a local network several receivers of different types, possibly communicating with the converter according to several modes of transmission.
• the signal converter of the invention can be used for digital signals received, whether or not they are satellites, and in particular has applications for transmissions by cable or over the air.
• the converter of the invention can also, in preferred embodiments, solve the problems of frequency acceptance downstream in a conventional TV signal distribution network.
• the invention also relates to a method for converting digital signals received, having the aforementioned advantages.
• converter and “conversion” is understood here to mean broadly the transformation of digital signals from a first form into a second distinct form.
• the subject of the invention is a converter of digital signals received in modulated and multiplexed form, comprising means for selecting at least a part of these signals by adjusting at least a determined frequency and for demodulating these parts. , capable of producing at least one demodulated sub-signal.
• the converter also includes:
• the converter comprises means for extracting transmission information received from the destination receivers, and the transformation means are capable of determine the transmission criteria based on this transmission information.
• the converter may thus be able to adapt flexibly and automatically the nature of the output signals according to the types of the receiving devices or of the network to which they belong.
• the exploitation of transmission information can be limited to certain transmission criteria only, in particular to a predefined set of communication protocols.
• the converter recognizes the protocol to be used as part of its capabilities and adapts accordingly, or it finds that the required transmission criteria are not part of its possibilities and renounces transmitting signals to the receiver or the affected receivers.
• the transformation means are able to make the remultiplexed stream conform to at least two communication protocols associated with the same physical layer, for example Hiperlan2 and IEEE 802.1 1 a.
• the transmission channels to the various receivers concerned can thus be the same (in the example above: wireless transmission).
• the converter can be used for different types of terminals, including simultaneously, without any intervention being necessary and economically (the implementation may in particular be purely software).
• the transformation means are able to make the remultiplexed stream conform to at least two communication protocols associated with two distinct physical layers, for example Ethernet and IEEE1394. In this case, separate communication channels are provided in the converter for the different protocols concerned respectively.
• the converter preferentially produces signals according to a protocol corresponding to a given channel (for example an IEEE1394 bus) only when it detects the presence of receivers associated with this channel, by means of the transmission information. These can possibly be reduced to a simple information of the presence of receivers connected downstream of this channel.
• a protocol corresponding to a given channel for example an IEEE1394 bus
• the converter of the invention is particularly advantageous when it serves a community, for example a business or a building. In fact, the risks of diversity of the terminals are then considerably increased compared to a simple home network.
• the selection and demodulation means are advantageously capable of carrying out “adjustment at at least one determined frequency” thanks to the presence of one or more tuners.
• these means comprise a tuner which makes it possible to successively select desired frequencies.
• they include several tuners in parallel, coupled with overhead sampling and digital signal processing for channel selection downstream. This latter embodiment can in particular make it possible to receive several channels situated at different frequencies in a given frequency band and to extract these channels in parallel.
• Several converters can be combined to make signals from several separate sources available to receivers. To do this, the remultiplexed flows from the various converters are advantageously collected in a central distribution system and made compatible by similar transmission criteria. This central system then acts as a relay vis-à-vis the destination receivers.
• the protocol used for the remultiplexed flows is advantageously a communication protocol to a digital network.
• this preferred form amounts to repatriating into this LNB part of the functionalities usually found in an STB, so as to broadcast at the output of this LNB a digital signal in a standard used for example in the PC world.
• the communication protocol is chosen from the Ethernet, IEEE1394 (for "Institute of Electrical and Electronic Engineers"), IEEE802.11a, Hiperlan2 and an online carrier communication protocol.
• a first version for which a cable is required to transmit the data we can notably rely on the Ethernet standard (10, 100 or 1000 base T, for example) or on a carrier current standard (Powerline) to constitute the network.
• IEEE802.11a or IEEE802.11e standards are good candidates.
• IP for “Internet Protocol”.
• Other similar standards can, of course, be used.
• IEEE802.1 1a / IP in the "wireless" version is Hiperlan2 / IEEE1394.
• the converter is intended to convert digital signals transmitted by satellite.
• the converter is then preferably integrated into an LNB.
• it is intended to convert signals transmitted by cable or over the air, which may in particular include a local multipoint telecommunication system or STML (in English: LMDS, for "Local Multipoint Distribution System") or a microwave multipoint distribution system or SDM (in English: MMDS, for “Microwave Multipoint Distribution System”), or digital terrestrial reception in the VHF / VHF band (noted in English “UHF / VHF” for “Ultra-High Frequencies "and” Very High Frequencies "), for example compliant with the DVB-T standard (for" Digital Video Broadcasting - Terrestrial ").
• the converter is able to process at least two of these types of signals.
• the selection and demodulation means are provided for selecting and demodulating digital transmission channels so as to produce the sub-signals.
• These channels are typically selected from the set of channels available on a set of polarization and band combinations.
• an LNB of the “Quattro” type is advantageously used for this purpose, which is designed to provide the four conventional polarization / band combinations (vertical or horizontal polarization, high or low band).
• the demultiplexing means are preferably provided for extracting audiovisual programs, constituting at least some of the portions.
• the remultiplexing means are then advantageously capable of remultiplexing these portions into MPEG transport trains (for “Moving Picture Experts Group”) constituting the remultiplexed flows.
• MPEG transport trains for “Moving Picture Experts Group”
• the number of transport trains thus created depends on the number of different programs that are simultaneously viewed or recorded. If this number is small enough (typically less than 8), a single multiplex may suffice.
• This remultiplexing operation can be accompanied by a modification of the transport packets: it may indeed be desirable to modify for example the value of certain fields of identification of packets (“PIDs” for “Packets Identifiers”) or that of certain fields clock reference (“PCRs” for “Program Clock References”).
• PIDs for “Packets Identifiers”
• PCRs for “Program Clock References”.
• the converter also comprises means for extracting extraction information received from the destination receivers, and the transformation means are capable of determining the sub-signals and the portions as a function of this information. extraction. In this way, the converter is able to adapt to the demands of the receivers, and in particular to transmit the desired programs to them.
• coming from the receivers means not only messages sent directly by these receivers, but also messages transmitted by one or more entities of a local network to which these receivers are linked.
• the information indicated above is not obtained from information communicated by the destination receivers, but is either predetermined, either set by an operator independent of the receivers and their local home network.
• the converter also comprises means for modulating return signals from the destination receivers. It can thus, in particular, simplify the feedback of information in the case of a satellite return channel (bidirectional LNB).
• An advantage significant of such an embodiment is that it authorizes identical destination receivers (in particular STBs), whether a return path to an operator is provided or not. Modulation functions usually designed to be integrated in receivers with return path to operator are in fact incorporated in the converter. It is sufficient that the receivers are provided with local interactivity capacities, that is to say have an uplink communication channel towards the converter.
• the converter is able to modulate the return signals according to at least two distinct types of modulation.
• Such a versatile converter is able to adapt to several return transmission channels, for example cable and satellite, depending on the mode of use which is made of it.
• the invention also relates to a method for converting digital signals received in modulated and multiplexed form, in which at least part of these signals are selected by adjustment to at least a predetermined frequency and these parts are demodulated so as to produce at least one demodulated sub signal.
• This conversion process includes steps of:
• the method also comprises a step of extracting transmission information received from the destination receivers, and the transformation step comprises determining the transmission criteria as a function of this transmission information.
• This conversion process is preferably implemented by means of a converter according to any one of the embodiments of the invention.
• the invention also applies to a receiver of multiplex digital signals conforming to a communication protocol.
• the receiver comprises means for preparing and transmitting transmission information by uplink communication, this transmission information comprising information on at least one communication protocol associated with the receiver.
• the receiver of the invention is preferably designed to receive a remultiplexed stream from the converter according to any one of the embodiments of the invention.
• FIG. 1 is a block diagram of a set of transmitting signals to a transmission network, transforming the signals received by a converter according to the invention and transmitting flows from the converter to receivers of a local network;
• FIG. 2 shows schematically in the form of functional blocks the converter of Figure 1;
• FIG. 3 shows a first application of the converter of Figures 1 and 2, to an LNB associated with a cable network
• - Figure 4 shows a second application of the converter of Figures 1 and 2, to an LNB associated with a wireless network
• FIG. 5 shows a third application of the converter of Figures 1 and 2, to three LNBs associated jointly with a cable network;
• FIG. 6 schematically illustrates the integration of the converter of Figures 1 and 2 in an LNB, for example for one of the embodiments of Figures 3 to 5;
• FIG. 7 shows in the form of functional blocks an STB of one of the receptors of Figures 1 to 6;
• - Figure 8 details an implementation of the LNB in Figure 6;
• modules represented are functional units, which may or may not correspond to physically distinguishable units.
• these modules or some of them can be grouped in a single component, or constitute functionalities of the same software.
• some modules may possibly be composed of separate physical entities.
• a transmitter 2 ( Figure 1) sends by general broadcast (called “broadcasting") broadcast signals 11 in modulated and multiplexed form to receivers R1, R2 ... Rn, via a transmission network 5 which is for example a network satellite or cable.
• the broadcast signals 11 are received by a signal converter 1 associated with a local network 6, connecting the receivers R1 -Rn.
• This converter 1 has the function of transforming the signals 11 so as to produce flows 15 adapted to the local network 6 and to the receivers R1-Rn, as a function in particular of control information 16 transmitted by these receivers or by entities of the local network 6.
• the receivers R1-Rn are capable of communicating to the transmitter 2 of the return signals via the converter 1 - or to another system, such as for example a service operator.
• These return signals are sent in the form of uplink communication signals 17 to the converter 1, then transformed by the converter 1 into modulated return signals 18, which are then relayed to the transmitter 2.
• the converter 1 comprises a module for selection by tuning and for demodulation 21 applied to the signals 11 received, intended to produce sub-signals 12, for example extracted from determined transmission channels.
• the converter 1 also includes a demultiplexing module 22 capable of extracting portions 13 of these sub-signals 12, typically consisting of audiovisual programs.
• a remultiplexing module 23 has the function of multiplexing these portions 13 into one or more remultiplexed streams 14, which may consist of one or more MPEG transport trains.
• a transformation module 24 is responsible for modifying these remultiplexed flows 14 in accordance with determined criteria for transmission to the receivers R1 -Rn, for example according to a communication protocol adapted to the local network 6. The adapted flows 15 thus produced at the output of the transformation module 24 are sent to the receivers R1-Rn.
• the converter 1 also has a module 25 for determining control parameters, provided for extracting from control information 16 communicated by the local network 6 (in particular by receivers R1-Rn), control parameters intended to govern the functions implemented in the converter 1: protocol to be implemented with respect to the local network 6, types of sub-signals and portions to be extracted, etc.
• a modulation module 27 present in the converter 1 furthermore processes the uplink communication signals 17, so as to produce the modulated return signals 18.
• control unit 26 oversees the operation of all the modules of the converter 1.
• the converter 1 being integrated in an LNB.
• a satellite antenna 50A provided with an LNB with converter 1A is connected to a wired local network 6A based on the Ethernet 100 Base T standard (hereinafter “100BT” for simplify) and having a pivot station 7A ("100BT hub").
• This station serves various receiving devices R1A, R2A ... R7A such as STBs, television, PC, printer and ADSL modem.
• the converter 1A of the LNB, wired to the pivot station 7A is capable of transforming the satellite signals 1 1 received by directly producing the adapted flows 15 according to the Ethernet standard 100BT.
• a second application referenced “B”, FIG.
• a satellite antenna 50B provided with an LNB with converter 1 B is provided for transmitting to a wireless local area network 6B based on the IEEE802.11a standard.
• This station serves various receiving devices R1 B, R2B ... R6B such as STBs, PC, printer and ADSL modem.
• the converter 1 B of the LNB is capable of transforming the satellite signals 11 received by directly producing the adapted flows 15 according to the IEEE802.11a standard.
• three satellite antennas 50C, 50C and 50C are connected to a wired local network 6C based on the Ethernet standard 100BT and having a pivot station 7C.
• This station serves various R1C, R2C ... R6C receiving devices such as STBs, television, PC and printer.
• Each of the converters 1C, 1 C and 1 C ", wired to the pivot station 7C is capable of transforming the satellite signals 1 1 received by directly producing the adapted flows 15 according to the Ethernet 100BT standard.
• the taking into account of several antennas allows thus supporting multiple bouquets for the 6C network.
• the described embodiment allows a simplification of the installation, by eliminating the signal distribution and switching accessories necessary in a conventional installation.
• An LNB 51 containing the converter 1 (FIG. 6) comprises, in addition to the converter 1, a module 31 for separating combinations of the signals 11 received.
• This separation module 31 is capable of providing, for example, the four polarization / band combinations, the LNB being of the Quattro type, and of transmitting them to the selection and demodulation module 21. It is also provided for carrying out a frequency reduction and amplification of the received signals.
• the selection and demodulation module 21 consists of a multichannel tuner / demodulator, which makes it possible to select and demodulate m determined digital satellite channels from among all the channels available on the four polarization / combinations bandaged.
• a demultiplexing and remultiplexing unit 28 which groups the demultiplexing 22 and demultiplexing modules 23, extracts from the m demodulated channels the programs that the viewer (s) wish (s) to watch or record, and remultiplex these channels, for example in p MPEG transport trains (the “multiplexes”).
• a network interface 29 of the converter 1, including the transformation 24 and determination 25 control parameter modules, is responsible for encapsulating these p multiplexes in transmission frames of the chosen communication protocol (for example IP and Ethernet 100BT or IEEE802 .11a).
• This network interface 29 also extracts control information 16 received from the various devices present on the network 6, that which is necessary to determine the requesting devices, as well as the channels and programs which must be demodulated. This information is used to fill in the recipient fields of the transmission frames and to control by means of the control unit 26 via a control bus, the tuner / demodulator 21 and the multiplexer / demultiplexer (unit 28).
• the network interface 29 has the additional function of recovering the data to be transmitted (uplink communication signals 17) and of transmitting them to the modulation module 27.
• the LNB 51 also includes a transposition and amplification module 32, provided for processing the modulated return signals 18 transmitted by the modulation module 27, before their return sending by satellite.
• a suitable STB 60 (FIG. 7) corresponding to the LNB 51 comprises a network interface 62 intended to receive the adapted flows 15 coming from the converter 1, that is to say responding to a communication protocol on the local network (for example Ethernet 100BT or IEEE802.11a).
• the STB 60 also includes a set 61 of conventional functions including a demultiplexer module 63, an audio / video decoder 64, an external interface 65 to the television set and a processor 66 controlling these different entities via a control bus.
• the STB 60 is therefore identical to a conventional satellite STB with the exception of its front end for satellite reception (tuner and demodulator), replaced here by the network interface 62 making it possible to receive the data present on the network used.
• the interface 62 and the processor 66 are adapted to transmit to the LNB 51 presence information, as well as possibly data relating to the identity of the communication protocol used.
• the STB 60 sends this information on request from converter 1 (this request can in particular be triggered by an operator during an initialization or update phase, or be triggered periodically automatically) .
• the STB 60 is designed to trigger the sending of this information on each connection to a network, and to send an end of presence signal on each disconnection.
• no satellite return channel is provided, so that the LNB does not include modules 27 and 32.
• Specific implementation modes are detailed below for LNB 51 and STB 60 (suffix "D"). To simplify the presentation, the parts of LNB 51 D and STB 60D relating to the satellite return channel are not shown or expanded in the comments.
• the LNB 51 D ( Figure 8) includes the 31 D separation module delivering the four polarization / band combinations (LNB Quattro), in the form of four BIS signals (for “Intermediate Satellite Band”; in English IF for “Intermediate Frequencies”) in the frequency band 950 MHz - 2150 MHz.
• the selection and demodulation module 21 (referenced 21 D) comprises a switching matrix 33, which makes it possible to orient any of these four signals towards a set of m tuners T1, T2 ... Tm and respectively associated demodulators DMD1, DMD2 ... DMDm.
• Ti tuners are known tuners, delivering an analog signal which is then sampled and converted to digital by the first stages of the DMDi demodulators.
• these m isolated Ti tuners are replaced by a digital tuner, which samples the BIS signals very early and digitally performs all the filtering and transposition operations to supply the m signals to be demodulated.
• the demultiplexing and remuitiplexing unit 28 receives the m demodulated sub-signals coming from the demodulators DMD1-DMDm respectively in m demultiplexers DMX1, DMX2 ... DMXm (which form the demultiplexing unit 22D).
• the m demodulation and demultiplexing operations are those commonly found in satellite STBs.
• m DMDi demodulators and DMXi demultiplexers The function of m DMDi demodulators and DMXi demultiplexers is to process the signals according to the transmission standard used (for example DVB-S in Europe - for “Digital Video Broadcasting - Satellite” and DSS in the USA - for “Digital Satellite System ”) and restore the data corresponding to the programs that viewers connected to the local network 6 wish to watch or record.
• the transmission standard used for example DVB-S in Europe - for “Digital Video Broadcasting - Satellite” and DSS in the USA - for “Digital Satellite System ”
• the remultiplexing unit 23D makes it possible to remultiplex the m programs restored in p streams (for example transport trains or "Transport Streams" for the MPEG standard), which may possibly be constituted a single stream, and present them to the 29D network interface.
• p streams for example transport trains or "Transport Streams" for the MPEG standard
• This network interface 29D successively comprises in the transmission chain:
• a device 34 for managing a high-level protocol such as, for example, IP
• an interface 35 for controlling access to the support known as the interface
• MAC for “Medium Access Control”
• this interface which depends on the medium, is different for the wired version and the wireless version;
• a physical interface 36 provided for physically processing the signals present on the transmission medium and the nature of which depends on this medium;
• a radio interface 37 responsible for operations associated with radio broadcasts (transposition, filtering, power control, gain control, etc.) .
• a processor 38 provided with its RAM memory (for “Random
• the detailed STB, referenced 60D ( Figure 9), differs from conventional satellite STBs by its network interface 62D, which replaces the front end for satellite reception (tuner and demodulator).
• This network interface 62D successively comprises in the transmission chain:
• a radio interface 67 optionally, in the case where the local network 6 is of the wireless type, a radio interface 67;
• a physical interface 68 physically processing the signals present on the interface; this interface 68 depends on the transmission medium used and is different for the wired version and the wireless version;
• MAC 69 interface providing an access layer to the transmission medium; this interface 69 also depends on the transmission medium; - And a layer 70 of high level protocol, for example IP.
• the converter 1 is included:
• the converter is dissociated from the signal reception center by general transmission (“broadcast”), for example from the LNB.
• the converter is then preferably placed in a device arranged downstream of a device for lowering the frequency and amplifying signals (such as an LNB) and upstream of the destination receivers. It can thus be incorporated in particular in an STB.

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Multimedia (AREA)
• Computer Networks & Wireless Communication (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
• Radio Relay Systems (AREA)
• Superheterodyne Receivers (AREA)
• Time-Division Multiplex Systems (AREA)
• Small-Scale Networks (AREA)
• Communication Control (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=33041930

Family Applications (2)

Family Applications After (1)

Country Status (8)

Families Citing this family (15)

Family Cites Families (5)

• 2003
  • 2003-04-17 FR FR0304801A patent/FR2854015A1/fr active Pending
• 2004
  • 2004-04-16 CN CNA2004800095044A patent/CN1771733A/zh active Pending
  • 2004-04-16 KR KR1020057019612A patent/KR20060004672A/ko not_active Application Discontinuation
  • 2004-04-16 CN CNA200480009503XA patent/CN1771732A/zh active Pending
  • 2004-04-16 MX MXPA05010965A patent/MXPA05010965A/es not_active Application Discontinuation
  • 2004-04-16 JP JP2006505556A patent/JP2006523977A/ja active Pending
  • 2004-04-16 WO PCT/EP2004/050536 patent/WO2004093454A1/fr active Application Filing
  • 2004-04-16 KR KR1020057019611A patent/KR20060004671A/ko not_active Application Discontinuation
  • 2004-04-16 EP EP04741460A patent/EP1614296A1/de not_active Withdrawn
  • 2004-04-16 US US10/553,539 patent/US20060262222A1/en not_active Abandoned
  • 2004-04-16 JP JP2006505557A patent/JP2006523978A/ja active Pending
  • 2004-04-16 WO PCT/EP2004/050537 patent/WO2004093455A1/fr active Application Filing
  • 2004-04-16 EP EP04727910A patent/EP1614295A1/de not_active Withdrawn
  • 2004-04-16 MX MXPA05010963A patent/MXPA05010963A/es not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events