Classifications

• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
  • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
• • 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
  • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
  • H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
• • 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
  • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
  • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
• • 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
  • H04N21/4405—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 involving video stream decryption
• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
  • H04N5/4446—IF amplifier circuits specially adapted for B&W TV
• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems
  • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

Definitions

• the invention relates to a device for distributing radio signals, in particular of the LNB (Low Noise Block) type, distributor, switches or simple coupling device.
• the invention also relates to a satellite reception system including the device.
• a reception antenna composed of a parabolic reflector and a source, a frequency conversion block transforming the signals received by the horn into electrical signals in band. intermediate, and a decoder which transforms the electrical signals into data or signal usable by a user device.
• the transmission frequency band may be wider than the intermediate frequency band.
• the conversion blocks carry out the choice of polarization and band selection (high band or low band) during the transposition into intermediate frequency.
• a known solution represented in FIG. 1, consists in using a single antenna 1 with a multi-output converter block 100.
• each decoder 2 of the same house can be connected independently to the converter block 100 while selecting the band and the polarization desired for the user device 3 with which it is associated.
• the multiple output conversion blocks 100 are commonly blocks having 2 or 4 outputs as shown in FIGS. 2 or 3.
• the invention proposes a solution which makes it possible on the one hand to be able to exchange data between at least two decoders by means of the antenna cable and on the other hand to make the signals received and / or transmitted by the decoders independent.
• the invention proposes adding a coupling device between the coaxial cables of an installation having at least two decoders.
• the coupling device comprises means for connecting the inputs / outputs connected to the decoders in order to make an electrical contact limited to a communication frequency band.
• the invention is a radio signal distribution device comprising at least two first signal inputs / outputs intended to be connected to decoders, characterized in that it comprises at least one communication means connecting the inputs / outputs between them in a communication frequency band.
• the communication means is a bandpass filter whose bandwidth corresponds to the communication frequency band.
• the device is a coupling device which further comprises at least two second signal inputs / outputs intended to be connected to two independent reception devices, each second input / output being connected to a first input / output through a filter which rejects the communication frequency band.
• the device is a source switching device which further comprises at least two second signal inputs / outputs intended to be connected to two independent reception devices, and switching means making it possible to connect each of the first inputs / outputs at each of the second inputs output as a function of a selection signal, said selection means being provided with means suppressing the communication frequency band.
• the device is a block for converting radio waves into an electrical signal which further comprises at least two transposing means for transforming a transmission frequency band into at least two intermediate frequency bands, at least two selection means which allow each of the first inputs / outputs to be connected to each of the transposition means.
• the transmission frequency band is separated into at least two intermediate frequency bands corresponding to two different wave polarizations.
• the transmission frequency band is separated into at least two intermediate frequency bands corresponding to the same polarization of waves but whose bandwidth is substantially twice as narrow.
• the block has four inputs / outputs and at least three means of communication.
• the invention is also a satellite program reception system comprising at least two sources of electrical signals corresponding to radio waves, said sources having at least two inputs / outputs, at least two decoders each connected to one of the inputs / outputs of said block via two separate coaxial cables.
• the two decoders exchange data with each other via coaxial cables, and at least one coupling device or a switching device as defined above, and the first inputs / outputs of which are connected to the decoders and the second inputs / outputs are linked to the sources.
• the invention is also a satellite program reception system comprising at least one block for converting radio waves into an electrical signal, said block having at least two inputs / outputs, at least two decoders each connected to one inputs / outputs of said block via two separate coaxial cables.
• the two decoders exchange data with each other via coaxial cables and said block is a device as defined above.
• FIG. 1 represents a satellite reception system using several decoders
• the Figures 2 and 3 show multiple output converter blocks according to the prior art
• Figures 4 and 5 show multiple output converter blocks according to the invention
• Figures 6 to 9 illustrate other embodiments .
• a first embodiment of the invention is an LNB 100 with multiple outputs.
• the multiple-output converter blocks 100 of FIGS. 2 to 5 have two parts, a first part 120 transposing the signal from the transmission band into a band of intermediate frequencies and a second part 110 making the selection of the transposed band to be sent to the decoder.
• the first part 120 has two inputs H and V which correspond to the signals coming from two probes which transform the waves received respectively with a horizontal polarization and a vertical polarization into electrical signals.
• the frequency bands received for each of these polarizations are between 10.7 and 12.75 GHz.
• the satellite intermediate band is between 950 and 2150 MHz which requires cutting the transmission band in two.
• First low noise amplifiers 121 and 122 amplify the signals of the frequency band received for each polarization.
• the output signal from each amplifier 121 and 122 is split using power dividers 123 and 124.
• Four mixers 125, 126, 127 and 128 multiply the signals from the power dividers 123 and 124 by a signal from the one of the two local oscillators 129 and 130.
• the local oscillators 129 and 130 supply sinusoidal signals of frequency for example equal to 9.75 GHz and 10.6 GHz respectively.
• Bandpass filters 131, 132, 133 and 134 placed at the output of the mixers 125, 126, 127 and 128 select the portion of transposed band which is placed inside the intermediate satellite band.
• the filters 131 and 132, associated with the oscillator 129 allow a frequency band between 950 and 1950 MHz to pass, which corresponds to the low transmission band
• the filters 133 and 134, associated with the 'oscillator 130 pass a frequency band between 1100 and 2150 MHz which corresponds to the high transmission band.
• Second low noise amplifiers 135, 136, 137 and 138 are placed respectively after the filters 131, 132, 133 and 134 in order to amplify the signals in intermediate frequency bands before supplying them to the switching matrix 110.
• the matrix switch 110 performs the selection for each input / output S1, S2, S3 and S4 of the conversion block 100 of the desired intermediate band.
• the switching matrices 110 of FIGS. 2 and 4 have two inputs / outputs S1 and S2 while the switching matrices 110 of FIGS. 3 and 5 have four inputs / outputs S1, S2, S3 and S4. However, although slightly different, the switching matrices 110 have the same elements.
• Power dividers 111 are connected to the outputs of the second amplifiers 135 to 138 in order to multiply the lines carrying the signals leaving said amplifiers 135 to 138, so that there are as many lines as there are inputs / outputs S1, S2, S3 and S4.
• First controlled switches 112 are connected to the lines leaving the power dividers 111 so that each first switch 112 selects the polarization for the same transmission frequency band (low or high).
• Second controlled switches 113 are connected to the outputs of the first switches 112 so that each second switch 113 is connected to two first switches 112 which correspond to two different transmission frequency bands.
• each second switch 113 is connected to one of the inputs / outputs S1, S2, S3 or S4 via a high-pass filter 114 which behaves in open circuit with respect to low-frequency signals which are used on the one hand to control the first and second switches 112 and 113 and on the other hand to supply the active circuits of block 100.
• Control circuits 115 are connected to each input / output to detect control signals, for example in accordance with the DiSEqC standard, and to control the first and second switches 112 and 113 associated with said input / output.
• the diagrams in FIGS. 4 and 5 show communication means 150 placed between the inputs / outputs.
• the communication means have the function of letting pass between the inputs / outputs S1, S2, S3 and S4 a frequency band which corresponds to a communication channel between decoders without letting through the frequencies which correspond to the intermediate bands or to the signals of ordered.
• the communication means 150 are produced using bandpass filters whose bandwidth corresponds to the communication channel between the decoders.
• the choice of the communication channel between the decoders can be done by choosing an ISM type frequency band (from the French: industrial, Scientific and Medical) which corresponds to a widely used frequency band and for which many circuits are available. in trade. As an example, it is possible to use a 10 kHz wide communication frequency band centered on 433 MHz.
• the choice of the communication channel can also be made in order to reduce the filtering constraints provided that it does not interfere with reserved frequency bands. For example, it is possible to have a communication band centered at 1 MHz. In order to keep a system simple, an all or nothing type modulation is used, for example, where the “zeros” are coded by the absence of the carrier at 1 MHz and the “ones” by the presence of the carrier at 1 MHz.
• the distribution network of Figure 6 comprises a plurality of decoders 2 connected to a switching device 200 in an installation comprising two individual antennas 201 and 202.
• the device switching 200 comprises a switching matrix 110 of a type similar to that described in FIG. 3.
• the switching matrix comprises two signal inputs / outputs E1 and E2 coupled respectively to each of the antennas 201 and 202 and four inputs / outputs of signals S1 to S4 respectively coupled to each of the decoders 2.
• the bandpass filters 150 are placed between the inputs / outputs S1 to S4 in order to allow only the communication channel to pass.
• the switching matrix 110 is obviously provided with high-pass filters 114, shown in FIG. 3, in order to suppress the communication channel and the switching signals coming from the decoders 2.
• FIG. 8 Another embodiment, illustrated in FIG. 8, consists in using a simple coupling device in a distribution network.
• the installation comprises two independent antennas 201 and 202 each connected to a decoder 2 by means of a coupling device 300.
• the coupling device 300 comprises two first inputs / outputs of signals E / S3 and E / S4 intended for be connected to decoders 2 and two second inputs / outputs E / S1 and E / S2 intended to be connected respectively to the LNBs of the antennas 201 and 202.
• a bandpass filter 150 connects the first I / O signals I / S3 and E / S4 in order to establish the communication between the decoders 2.
• the second inputs / outputs E / S1 and E / S2 are respectively connected to the first inputs / outputs of signals E / S3 and E / S4 by means of filter rejectors band 301 and 302 which reject the frequency band corresponding to the communication channel used by the decoders 2.
• Such a coupling device can be extended to N first and N second inputs / outputs.
• Each addition of a couple of inputs / outputs add a bandpass filter 150 and a band rejection filter 303, as shown in dotted lines.
• the invention can be extended to any device or combination of device entering the satellite reception chain with users when the latter comprises a plurality of decoders requiring a means of communication between them.
• the device must then include filters
• the invention can be integrated among other things with multiple output antenna amplifiers, multiple output satellite / satellite couplers, multiple output satellite / terrestrial couplers, splitters, antenna switches, and any other element of a collective distribution system

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• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Multimedia (AREA)
• Physics & Mathematics (AREA)
• Astronomy & Astrophysics (AREA)
• General Physics & Mathematics (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Applications Claiming Priority (5)

Publications (1)

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• 2003
  • 2003-10-21 US US10/531,742 patent/US8739227B2/en not_active Expired - Fee Related
  • 2003-10-21 WO PCT/FR2003/003106 patent/WO2004038965A1/fr not_active Ceased
  • 2003-10-21 CN CN2003801017546A patent/CN1706131B/zh not_active Expired - Fee Related
  • 2003-10-21 AU AU2003285416A patent/AU2003285416A1/en not_active Abandoned
  • 2003-10-21 KR KR1020057006792A patent/KR100984838B1/ko not_active Expired - Fee Related
  • 2003-10-21 MX MXPA05004246A patent/MXPA05004246A/es active IP Right Grant
  • 2003-10-21 EP EP03778415A patent/EP1554824A1/de not_active Withdrawn
  • 2003-10-21 JP JP2005501539A patent/JP4459899B2/ja not_active Expired - Fee Related
  • 2003-10-21 BR BR0315378-9A patent/BR0315378A/pt not_active Application Discontinuation

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