EP2106049A2 - Dispositif de signalisation d'erreurs dans un système de répartition de signal pour signaux satellites - Google Patents

Dispositif de signalisation d'erreurs dans un système de répartition de signal pour signaux satellites Download PDF

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Publication number
EP2106049A2
EP2106049A2 EP09004483A EP09004483A EP2106049A2 EP 2106049 A2 EP2106049 A2 EP 2106049A2 EP 09004483 A EP09004483 A EP 09004483A EP 09004483 A EP09004483 A EP 09004483A EP 2106049 A2 EP2106049 A2 EP 2106049A2
Authority
EP
European Patent Office
Prior art keywords
signaling
satellite
signal
voltage
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09004483A
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German (de)
English (en)
Other versions
EP2106049A3 (fr
Inventor
Dieter Markwordt
Falk Michael
Lars Eltzschig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technisat Digital GmbH
Original Assignee
Technisat Digital GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technisat Digital GmbH filed Critical Technisat Digital GmbH
Publication of EP2106049A2 publication Critical patent/EP2106049A2/fr
Publication of EP2106049A3 publication Critical patent/EP2106049A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
    • H04H60/32—Arrangements for monitoring conditions of receiving stations, e.g. malfunction or breakdown of receiving stations
    • 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 invention relates to a device for signaling operating states, in particular faulty configured devices in a Signalverkeil system with a cable distribution network that simultaneously supplies a plurality of radio receiver via a common coaxial cable with a requested satellite signal.
  • the common coaxial cable of the cable distribution network for which the subject matter of the invention is usable transmits the broadcast programs to the radio receivers on different output frequency bands.
  • Known conventional satellite systems transmit a multiplicity of programs, radio, data services in different frequency blocks and with different antenna polarization to the satellite receiver. It is known to use various radio frequency bands, such as the lower band between 10.7-11.7 GHz and the upper band 11.7-12.75 GHz and a use of at least the vertical and the horizontal wave polarity for transmitting satellite signals to the satellite -Antenna.
  • a programmable signal converter is required, which at the request of a satellite receiver each with only a subband of available in the bands satellite signals only a wave polarity in an intermediate frequency range, for example, 950MHz-2150 MHz converts and transmits to the satellite receiver.
  • a signal distribution system for satellite signals with a common cable uses narrowband output signals for each satellite receiver.
  • each receiver is assigned a fixed output frequency band and the receiver sends via the common terminal a control signal with control commands to a programmable signal converter, which contains both information on the desired frequency block and the frequency within this block and an identification of the requesting STB (so-called User band number).
  • the signal converter selects the desired frequency block and makes a frequency translation from the selected frequency within that block to the output frequency associated with the requesting receiver.
  • the control is closely based on DiSEqC, in principle only defined additional custom commands.
  • the receivers In receive mode, the receivers permanently give a DC voltage of 13V on the common coaxial cable, just for sending a control command, the voltage from the transmitting satellite receiver is raised to 18V a few milliseconds before the start of the command and lowered again a few ms after the end of the command,
  • connection of the receiver to the common coaxial cable of the cable distribution network will each include a switching diode reverse biased when the receiver provides a voltage level of 13V to the programmable signal converter.
  • the receiver raises the voltage level of the operating voltage to a second level value of 18V and adds thereto a modulated control signal on a carrier frequency of 22 kHz.
  • the switching diodes via which the receivers are connected to the cable distribution network, effect during decoupling of the control command, a decoupling of all receivers are in the receive mode to avoid distortion of the control signal, which is modulated on the 22 kHz carrier.
  • such a single-cable receiving system can provide a plurality of satellite receivers with a desired satellite broadcasting signal over a single cable.
  • LNB Low Noise Block
  • the multiswitch receives several broadcast signals via several tuners and transforms them into different frequency bands.
  • a common cable is used to transmit to the satellite receivers with multiple satellite receivers connected to the common cable.
  • the satellite receivers may sequentially transmit their request for a satellite signal having a desired broadcast program to the programmable signal converter via the common cable, for example, at the request of users, each during a communication operation with a system-defined control duration via the common coaxial cable.
  • For each radio receiver for a frequency band is assigned, in which the multi-switch transforms the respective requested broadcast signals to transmit them to the respective radio receiver.
  • a solution is known to solve a blocking problem by permanently fed 18V by means of an RF junction box, which is integrated in a monitoring device.
  • the junction box disconnects a connected, improperly configured receiver from the cable distribution network when a voltage above a selectable threshold is applied for longer than a specified time.
  • separation if due to the permanently high voltage the current through the can exceeds certain limits regarding height and duration.
  • the international document WO2006120203A2 discloses the connection of the satellite receiver to a cable via a so-called "smart splitter”. This includes additional active monitoring and switching equipment where two or more paths are merged. When a control command is detected at one connection, the other or the others are forcibly disconnected from the bus. At the same time should be informed with a "busy tone", which can be detected by a DiSEqC return channel satellite receiver, the forcibly separated branch that control commands are currently not forwarded to the distribution device.
  • the solution is primarily for locally identifying the state of a branch of the bus ie green - control command of the relevant branch is forwarded, red - control command of the relevant branch is not forwarded.
  • a single-cable system which contains a device for generating and evaluating a collision protection signal. This ensures that at any given time, communication with a controller is feasible only on the part of a single radio receiver.
  • the device for generating and evaluating a collision protection signal is constructed so that before the dispatch of a designated therein as "control signal" channel change command first an actual control signal upstream collision protection phase is performed, in which first checks the data bus for activities of another radio receiver is, so that only if no activity on the data bus is detected, be sent by the broadcast receiver actual control signals to the control unit.
  • the collision protection phase is at least three-parted, namely a first bus activity observation phase for a period of time (t0) in which it is checked whether other radio receivers or the control unit active on the bus, a subsequent bus request phase having a duration (t2) in which a signal signaling an activity is delivered by the radio receiver to the bus, and a subsequent further bus observation phase for a second time duration (t2) in which no signal is present delivered the bus.
  • the publication DE102005036810B4 points in this context on the problem that satellite receivers also exist, which can take on a voltage applied to its output DC voltage, which can assume a first voltage state of about 14V or a second voltage state of about 18V, a desired polarization plane via a multi-switch or a Select LNB converter.
  • Such a satellite receiver may block the control signal transmission of other satellite receivers connected to this cable due to misadjustment by the continuous application of a voltage of 18V to the common cable of a single-cable receiving system.
  • DE102005036810B4 proposes to solve this problem, an HF-can, in which a detector device is provided, which checks the DC voltage supplied. This detector device then switches off the connected receiver or disconnects it from the common cable if the DC voltage fed in by this receiver remains at the excessively high DC voltage level for a corresponding predefinable period of time. The time to switch off a faulty receiver is set so that a certain number of DiSEqC commands can pass through the bus unhindered.
  • the object of the present invention is to provide a device for signaling operating conditions in a cable distribution network, which avoids the aforementioned problems, and manages without reinstalling existing network components
  • This object is achieved by a device for signaling operating states in a signal distribution system for satellite signals with a cable distribution network.
  • the cable distribution network includes a programmable signal conversion device which converts the broadcast signals of different satellite transponders into different output frequency bands.
  • a programmable signal conversion device is defined for example in the standard DIN EN 50494 as a single cable interface (SCIF) and may include a block converter (LNB) or multi-switch.
  • SCIF single cable interface
  • LNB block converter
  • the programmable signal transceiver (SCIF) has at least one satellite signal output providing satellite signals requested simultaneously for a plurality of satellite receivers via a coaxial cable, wherein the requested satellite signals are converted to different output frequency bands and each satellite receiver is assigned a single frequency band.
  • SCIF block converter
  • SCIF has at least one satellite signal output providing satellite signals requested simultaneously for a plurality of satellite receivers via a coaxial cable, wherein the requested satellite signals are converted to different output frequency bands and each satellite receiver is assigned a single frequency band.
  • the satellite receivers connect the transmission of control signals to the programmable signal conversion device with the coupling of different voltage levels of the DC operating voltage via switching diodes in the coaxial cable.
  • a first voltage level indicates a receiving operation of the radio receiver, while a second voltage level defines the communication operation of a satellite receiver.
  • the device for signaling operating states evaluates a voltage profile at the satellite signal output of the programmable signal Signal converter and signals at least one change between a first voltage level of the DC operating voltage and a second voltage level, wherein the second voltage level corresponds to the communication operation of a satellite receiver.
  • each receiver Since each receiver indicates its communication mode on the common coaxial cable through the second voltage level, it is necessary to indicate with the device for signaling operating states according to the invention, when a partial receiver occupies the communication mode of the programmable signal conversion device beyond the system internally defined request duration and the Communication mode so that it is not available for other connected satellite receiver.
  • the device for signaling operating states is advantageously designed such that it signals when a satellite receiver occupies the communication mode of the programmable signal conversion device beyond the system-internally defined request duration and furthermore signals that at least one satellite receiver connected to the programmable signal conversion device is in the receive mode.
  • the device includes a voltage level detection, which only outputs a signal when the DC operating voltage on the common coaxial cable beyond the system-defined internal control defect duration takes the second voltage level.
  • the signaling device has additional means for signaling the control signal transmitted in the communication mode on the common coaxial cable. This will allow correct docking of all satellite receivers to the coaxial cable.
  • the invention uses for displaying light-emitting diodes, which are connected via at least one voltage-dependent threshold value switch on the common coaxial cable.
  • a particularly convenient signaling occurs when processor means for evaluating data, transmitted control commands and operating states on the common coaxial cable are cached in a command buffer.
  • processor means for evaluating data, transmitted control commands and operating states on the common coaxial cable are cached in a command buffer.
  • a faulty satellite receiver can be determined on the part of the programmable signal converter.
  • the detection of causes of disturbances in the receiving mode, such as access to the same output frequency by multiple receivers is possible, such as the transmission of configuration commands while receiving other receivers
  • Such a device advantageously contains an alphanumeric display for displaying control command elements transmitted in the control signal or outputting the identification of Satellite receivers that are in receive mode.
  • the device additionally has means which recover and display its identification from the operating state of the programmable signal conversion device or from the control signal of the requesting satellite receiver.
  • the signaling apparatus may additionally comprise satellite signal detection means for which satellite receivers the signal conversion equipment provides a converted output frequency band.
  • the invention can be used at any point in the distribution system and is not bound to the branches.
  • Preferred Embodiment Evaluation and Signaling of the Increased 18V Level of DC Voltage with Very Simple Means, e.g. using a zener diode, thereby signaling the failure of the permanent supply of 18V as well as the short-term supply of 18V in regular operation in terms of a bus activity indicator. Signaling e.g. (but not limited to) optically by LED.
  • error signaling is reset manually by the user, so that the cause of the error remains identifiable even beyond the duration of the actual occurrence of the error.
  • Signaling the voltage level for the receive mode allows an indication of the usage of the system as opposed to the de-energized idle state or fault short circuit / undervoltage.
  • a further preferred embodiment provides for the evaluation and signaling also of a modulated AC voltage or a modulated AC current, e.g. 22 kHz, thereby e.g. Signaling one for conventional systems.
  • a more complex evaluation circuit e.g. using a microprocessor, for the evaluation, buffering and signaling of the transmitted control commands or elements thereof, e.g. Display by means of LCD display.
  • Another preferred embodiment provides for use of a more complex evaluation circuit, for example using RF filters, RF detectors and PLL synthesizers, for evaluating and signaling the occupancy of the RF output frequencies of the distribution device with regard to level and modulation type.
  • a more complex evaluation circuit for example using RF filters, RF detectors and PLL synthesizers, for evaluating and signaling the occupancy of the RF output frequencies of the distribution device with regard to level and modulation type.
  • a more complex evaluation circuit for example using RF filters, RF detectors and PLL synthesizers
  • the abovementioned incorrect operation is thereby recognized, for example, by a service technician and can be assigned to the corresponding output of the device according to the invention, for example a multiswitch.
  • the solution according to the invention can be integrated in existing systems, for example by installing a corresponding multi-switch without further installation effort and in particular when supplying several households via a line without entering the individual apartments.
  • the signaling always takes place precisely when the said DC voltage continuously assumes a correspondingly high voltage level for longer than a predetermined period of time.
  • the signaling is maintained until it is manually canceled by the manual operation of the means provided for it.
  • the operating state in which at least one radio receiver connected to the common cable is in operation is also signaled, for example, via a further light-emitting diode or via a second state of the first light-emitting diode.
  • the said DC voltage may preferably be less than 14V.
  • This state can be represented, for example, in that the first light-emitting diode is a so-called “multi-color light-emitting diode", which is characterized in that it lights up in different colors in different voltage states, and this multicolor light-emitting diode lights up in a first color, if the DC voltage assumes a first voltage state of greater than 17V, and that this multicolor LED lights in a second color when the DC voltage assumes a second voltage state of less than 14V.
  • multi-color light-emitting diode which is characterized in that it lights up in different colors in different voltage states, and this multicolor light-emitting diode lights up in a first color, if the DC voltage assumes a first voltage state of greater than 17V, and that this multicolor LED lights in a second color when the DC voltage assumes a second voltage state of less than 14V.
  • FIG. 2 shows an exemplary embodiment of the invention
  • FIG. 3 schematically shows a conversion of frequency ranges of several available fixed to fixed output frequency bands
  • FIG. 4 shows an apparatus according to the invention for signaling operating conditions in a signal distribution system.
  • a light-emitting diode LED 1 Via a low-pass inductance L and a series resistor, a light-emitting diode LED 1 is connected to a common coaxial cable K1 in order to signal the receiving state.
  • a threshold value D In series with a light emitting diode LED 2 is a threshold value D, so that the light emitting diode LED 2, only lit when the operating voltage reaches the voltage level for the communication mode.
  • a satellite receiver SE2 In a household, a satellite receiver SE2 is set incorrectly in such a way that it applies a continuous 18V DC operating voltage to its input during operation. This blocks the transmission of control signals from other satellite receivers SE1 and SE2 via the common cable to the multi-switch SCIF.
  • the multi-switch SCFI is a device for signaling operating states according to the invention, which indicates via a light emitting diode, by constantly lighting the voltage level, which is provided for the communication operation.
  • a service technician or an interested layman can immediately detect the cause of the fault and inform the households connected to this common cable accordingly.
  • the signal means may be a "multi-color LED" which lights up at different voltage states in different colors, and that this first LED lights in a first color when the DC voltage corresponds to the first voltage state and that the first LED lights in a second color when the DC voltage corresponds to the second voltage state.
  • the one "multi-color LED” can be used as an operating status display, which signals different voltage levels by different colors
  • the signaling device may be both a multi-switch in a satellite multiswitch system and a cable headend in a cable television system as well as a frequency converter, a so-called Low Noise Block (LNB) in a satellite receiving system.
  • LNB Low Noise Block

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
EP09004483A 2008-03-27 2009-03-27 Dispositif de signalisation d'erreurs dans un système de répartition de signal pour signaux satellites Withdrawn EP2106049A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008016384 2008-03-27

Publications (2)

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EP2106049A2 true EP2106049A2 (fr) 2009-09-30
EP2106049A3 EP2106049A3 (fr) 2012-10-10

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EP09004483A Withdrawn EP2106049A3 (fr) 2008-03-27 2009-03-27 Dispositif de signalisation d'erreurs dans un système de répartition de signal pour signaux satellites

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EP (1) EP2106049A3 (fr)
DE (1) DE102009016540A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19749120C2 (de) 1997-11-06 2002-07-18 Kathrein Werke Kg Satelliten-Empfangsanlage sowie zugehöriges Verfahren zum Betrieb einer Antennen-Empfangsanlage
WO2006120203A2 (fr) 2005-05-09 2006-11-16 Unitron Commutateur de priorite pour resoudre les problemes de collision relatifs a la signalisation dans un bus
DE102005036810B4 (de) 2005-08-04 2007-09-06 Kathrein-Werke Kg HF-Dose

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19805603A1 (de) * 1998-02-12 1999-10-21 Asc Tec Gmbh Antennen Satellit Schalteinrichtung für den Satellitenempfang

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19749120C2 (de) 1997-11-06 2002-07-18 Kathrein Werke Kg Satelliten-Empfangsanlage sowie zugehöriges Verfahren zum Betrieb einer Antennen-Empfangsanlage
WO2006120203A2 (fr) 2005-05-09 2006-11-16 Unitron Commutateur de priorite pour resoudre les problemes de collision relatifs a la signalisation dans un bus
DE102005036810B4 (de) 2005-08-04 2007-09-06 Kathrein-Werke Kg HF-Dose

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Publication number Publication date
EP2106049A3 (fr) 2012-10-10
DE102009016540A1 (de) 2009-10-01

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