WO2001056201A2 - Station terrestre et procede pour produire un flux de donnees comportant un programme principal et un programme supplementaire - Google Patents

Station terrestre et procede pour produire un flux de donnees comportant un programme principal et un programme supplementaire Download PDF

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Publication number
WO2001056201A2
WO2001056201A2 PCT/EP2001/000876 EP0100876W WO0156201A2 WO 2001056201 A2 WO2001056201 A2 WO 2001056201A2 EP 0100876 W EP0100876 W EP 0100876W WO 0156201 A2 WO0156201 A2 WO 0156201A2
Authority
WO
WIPO (PCT)
Prior art keywords
ground station
input
program
multiplexer
additional program
Prior art date
Application number
PCT/EP2001/000876
Other languages
German (de)
English (en)
Other versions
WO2001056201A3 (fr
Inventor
Rainer Perthold
Heinz GERHÄUSER
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority to AU2001237348A priority Critical patent/AU2001237348A1/en
Publication of WO2001056201A2 publication Critical patent/WO2001056201A2/fr
Publication of WO2001056201A3 publication Critical patent/WO2001056201A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18517—Transmission equipment in earth stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • H04H20/51—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for satellite broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/19—Aspects of broadcast communication characterised by the type of broadcast system digital satellite radio [DSR]

Definitions

  • the present invention relates to satellite-based broadcasting systems and in particular to a ground station for generating a data stream, which has a main program and an additional program.
  • the main program is, for example, a radio program
  • the additional program includes, for example, commercials keyed into the radio program.
  • the satellite-based radio system is designed to distribute a large number of individual radio programs across the board.
  • Source coding in accordance with ISO MPEG Layer 3 is used for the audio signal that is generated in a recording studio.
  • the audio signal and optionally data signals are then combined with auxiliary information in a ground station to form a so-called "broadcast channel".
  • a broadcast channel can also include several audio and data signals, wherein several audio signals can include the same main program in several languages, for example.
  • a Reed-Solomon code and a convolutional code are used at the broadcast channel level.
  • the Viterbi algorithm ie an algorithm that works on the principle of maximum likelihood estimation, is usually used for decoding the convolutional code.
  • the broadcast channel is divided into several "prime rate channels" by means of a demultiplexer. The number of prime rate channels available depends on the broadcast channel data rate. A broadcast channel can have between 1 and 8 prime rate channels.
  • Each prime rate channel is then modulated onto its own frequency carrier.
  • the modulated signals are superimposed and then fed to an RF output stage, which has an up-mixer, in order to convert the signal to be transmitted to an RF carrier frequency which is in the gigahertz range.
  • the converted or highly mixed signal is then fed to a power amplifier, whereupon the amplified signal is supplied to a transmitting antenna.
  • the transmitting antenna is used to transmit the amplified signal to a satellite.
  • this signal is converted into a time-division multiplex bit stream, which is converted into an analog signal via a QPSK modulator, which is then sent directly to receivers by a transmitting antenna of the satellite, or which is sent to receiving stations in the case of terrestrial re-broadcasting which then "redistribute" the signal terrestrially.
  • the distance from the ground station to the satellite is called the uplink, while the distance from the satellite back to earth is called the downlink.
  • a worldspace ground station receives the audio signal either as an MPEG-encoded digital signal or as an uncompressed analog audio signal.
  • the additional program is treated as a main program in the recording studio in which the audio signal is generated.
  • a disadvantage of this concept is the fact that the recording studio has to deal with the keying in of advertising at all, which on the one hand entails extensive correspondence between the recording studio and the commercial manufacturer, and on the other hand also means additional expenditure on equipment for the recording studio.
  • the keying in of advertising in the recording studio is therefore both administrative and equipment-intensive for the recording studio on the one hand and for the advertising spot manufacturer on the other.
  • the object of the present invention is to provide a ground station and a method for generating a data stream, which has a main program and an additional program, which facilitate the keying in of additional programs into a main program.
  • the present invention is based on the finding that conventional keying in of additional programs into a main program within the recording studio itself has to be abandoned. Instead, it is much easier for everyone involved to run additional programs into a main program only in the ground station, which generates the RF signal to be emitted via an antenna. Typically, almost all devices that are required for this task are located in such ground stations. According to the invention, only modifiable modifications to existing ground stations are necessary in order to achieve a simple insertion of additional programs, for example in the form of commercials, into a main program, which can be a radio program.
  • the ground station preferably has a memory for storing the additional program already in compressed form, for example as an MPEG Layer 3 data stream or as an MPEG-AAC data stream.
  • the ground station further comprises a multiplexer with two inputs and one output, the first input being intended to receive the main program from outside the ground station, while the second input is intended to be the additional program from the memory which is installed in the ground station , to recieve.
  • the ground station further comprises a control device for controlling the multiplexer such that the output of the multiplexer at a first point in time from the first input to the second input is switched, and at a second point in time is switched again from the second input to the first input.
  • the ground station further comprises a transmitting device which is connected to the output of the multiplexer and which is connected on the output side to a transmitting antenna in order to feed the data stream to the transmitting antenna.
  • this transmitting antenna is the terrestrial transmitting antenna, which contributes to the uplink connection from the earth to a broadcast satellite.
  • Advertising spots are preferably already stored in coded form in a memory of the ground station. As soon as an advertisement is then to be loaded, the multiplexer is switched over so that the main program from the recording studio or the output data of the MPEG encoder no longer appear at the output of the multiplexer, but rather the additional program coming from the memory, which has an already existing data interface of the multiplexer is fed into the same.
  • the advantages of the present invention are that no devices beyond the ground station are required.
  • the recording studio does not need to be equipped accordingly, which leads to considerable savings in costs and administrative expenses.
  • ground station can be easily adjusted to detect which commercials have been keyed in when.
  • Another advantage of the present invention is that the additional program, for example in the form of commercials, can be exchanged or modified via a remote maintenance device which is already present for the ground station.
  • FIG. 1 shows a basic block diagram of a ground station according to the invention.
  • Fig. 2 is a detailed block diagram of a preferred embodiment of a WorldSpace ground station, which is adapted for the inventive concept.
  • the ground station comprises a memory 12 for storing the additional program.
  • the ground station further comprises a multiplexer 14 with a first input 14a, a second input 14b and an output 14c.
  • the multiplexer 14 further comprises a control input 14d, which is connected to a control device 16.
  • the ground station further includes a transmitter 18 for providing a data stream at an output 20, the data stream at the output 20 being capable of being delivered to a transmitting antenna 22 which establishes the uplink connection to a satellite (not shown in Fig. 1) can.
  • the ground station 10 further comprises an input 24 via which a main program can be fed to the multiplexer 14.
  • the main program which can be a radio or television program, for example, is generated in a sound or television studio.
  • the main program can consist of analog audio data.
  • the ground station comprises an MPEG encoder between the input 24 and the input 14a of the multiplexer in order to compress the analog audio signal. If the recording studio already has an MPEG encoder on the output side, then no encoder is required within the ground station 10. It should be noted that not only MPEG methods can be used to compress data, but also any other known compression algorithms.
  • the additional program which can be, for example, an advertising spot, is stored in the memory 12 within the ground station 10. If the additional program is already stored in compressed form, no data compressor is required between the output of the memory and the second input 14b of the multiplexer 14.
  • an encoder can be provided between the output of the memory 12 and the second input 14b of the multiplexer 14.
  • the output 14c of the multiplexer is connected to the first input 14a of the multiplexer, so that the main program is continuously transmitted to the satellite. If an additional program is to be keyed into the main program, the controller 16 will control the multiplexer 14 in such a way that the main program no longer comes to the transmitting antenna, but an additional program stored in the memory 12.
  • the second input 14b of the multiplexer 14 is then connected to the output 14c of the multiplexer.
  • main program data is continuously supplied to the ground station 10 via the input 24, as is the case, for example, in the case of a live transmission, the main program data can simply be discarded during the time in which the additional program is keyed in.
  • the main program data arriving at the time the additional program is transmitted can be stored, for example, in a buffer of the multiplexer 14.
  • the supply of the main program to the ground station can be interrupted in this interval.
  • the ground station already has a memory between the input 24 and the first input 14a of the multiplexer in order to store the entire main program data already within the ground station. store in such a way that the time of transmission from the recording studio to the ground station does not coincide with the time of radio transmission of the data stream.
  • FIG. 2 shows a preferred exemplary embodiment of the present invention within a WorldSpace ground station, which is also referred to as a processed feeder link station.
  • the ground station again comprises the input 24, but in contrast to the exemplary embodiment shown in FIG. 1, an MPEG encoder 30 is now present between the input 24 and the first input 14a of the multiplexer.
  • the ground station also includes a data interface 32, which is commonly used to transmit data in addition to audio signals. This data interface 32 is used according to the invention in order to supply the additional program stored in the memory 12 to the multiplexer 14 via a data connection 34 in the event that an additional program is keyed into the main program.
  • the multiplexer 14 is in turn controlled by the controller 16.
  • the multiplexer 14 further comprises a device for forming the so-called broadcast channel.
  • the transmitting device (reference number 18 in FIG. 1) comprises a demultiplexer for demultiplexing the broadcast channel and for generating the individual prime rate channels.
  • the transmitting device further comprises a frequency division multiplex modulation device, which is denoted by the reference symbol 18a, and a downstream summator in order to supply a frequency multiplexing signal which is fed to the RF stage 18b of the transmitting device.
  • HPA High Power Amplifier
  • the RF stage 18b of the transmitter further comprises a low noise amplifier (LNA) and an output for controlling the direction of transmission of the antenna 22.
  • the ground station also includes a monitoring and control computer 40 which is coupled to both memory 12 and controller 16. It should be noted that in a preferred embodiment of the present invention, memory 12 and controller 16 for controlling multiplexer 14 are part of monitoring and control computer 40. Only for reasons of illustration, these elements are shown in FIG. 2 as separate devices.
  • the ground station enables a broadcaster to feed a program into the WorldSpace system via the satellite's on-board processor.
  • the uplink connection to the satellite is made using frequency division multiplexing.
  • One frequency is assigned to an elementary data channel of the WorldSpace system.
  • Each of these channels carries user data at a rate of 16 kilobits per second and, as has been explained, is referred to as the prime rate channel.
  • the prime rate channels are converted into a time-division multiplex signal and sent to the WorldSpace receivers as a frame-synchronized signal with a frame duration of 432 ms.
  • a synchronization sequence and control information are sent out.
  • the control information contains the information that a receiver needs to process the user data, i. H.
  • the broadcast channel to gain from the time-division multiplex signal.
  • the ground station From the different service components belonging to one or more broadcast channels, the ground station generates the transmit signal in the form of the individual prime rate channels, which, as shown in FIG. 2, are each modulated onto their own carrier frequency ,
  • the audio data stream comes from the studio of the program provider.
  • the commercials are already layer 3-coded on the control computer 40 or in the memory 12 of the ground station.
  • the broadcast channel multiplexer 14 reconfigured so that the output data of the MPEG encoder 30, ie the main program, is no longer sent to the satellite, but rather the commercial supplied via the data interface 32.
  • the monitoring and control computer 40 further comprises means for logging the keying in of additional programs in order to provide information about when which commercials were introduced. This takes the cost of logging and billing off the commercials from the recording studio.
  • the monitoring and control computer 40 is, as represented schematically by a channel 42, from a central control point, e.g. B. the recording studio, remotely controllable.
  • the monitoring and control computer 40 can preferably be controlled remotely in such a way that an exchange of the commercials or an update of the commercials in the memory 12 can also take place via this data connection. This makes it easy to delete old commercials or to store new commercials in a ground station.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention concerne une station terrestre (10) servant à produire un flux de données (20) qui comprend un programme principal et un programme supplémentaire. Cette station terrestre comprend une mémoire (12) servant à mémoriser le programme supplémentaire, par exemple un message publicitaire, tandis que le programme principal est un programme radio produit dans un studio. Cette station terrestre comprend en outre un multiplexeur (14) comprenant une première entrée (14a) servant à recevoir le programme principal et une deuxième entrée (14a) servant à recevoir le programme supplémentaire de la mémoire, ainsi qu'une sortie. Elle comprend également une unité de commande (16) servant à commander le multiplexeur (14) de sorte qu'une sortie (14c) du multiplexeur (14) soit connectée, à un premier moment, de la première entrée à la deuxième entrée, et à un deuxième moment, de la deuxième à la première entrée, pour introduire le programme supplémentaire dans le programme principal entre le premier et le deuxième moment. Cette station terrestre comprend enfin une unité d'émission (18) qui est raccordée côté entrée à la sortie du multiplexeur (14) et qui, côté sortie, est raccordée à une antenne d'émission (22) pour acheminer le flux de données (20) à cette dernière (22). Des messages publicitaires peuvent ainsi être introduits facilement dans le flux de données, sans nécessiter pour autant des appareils particuliers dans un studio. Cette station terrestre peut en outre déterminer facilement à quel moment un message publicitaire a été introduit. Ces messages publicitaires peuvent enfin être remplacés ou mis à jour facilement par l'intermédiaire d'une unité de maintenance à distance optionnelle.
PCT/EP2001/000876 2000-01-26 2001-01-26 Station terrestre et procede pour produire un flux de donnees comportant un programme principal et un programme supplementaire WO2001056201A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001237348A AU2001237348A1 (en) 2000-01-26 2001-01-26 Ground station for use in radio transmission via satellite and method for generating a data stream that comprises a main program and an additional program

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10003364.4 2000-01-26
DE10003364 2000-01-26

Publications (2)

Publication Number Publication Date
WO2001056201A2 true WO2001056201A2 (fr) 2001-08-02
WO2001056201A3 WO2001056201A3 (fr) 2002-11-14

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PCT/EP2001/000876 WO2001056201A2 (fr) 2000-01-26 2001-01-26 Station terrestre et procede pour produire un flux de donnees comportant un programme principal et un programme supplementaire

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AU (1) AU2001237348A1 (fr)
WO (1) WO2001056201A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4720873A (en) * 1985-09-18 1988-01-19 Ricky R. Goodman Satellite audio broadcasting system
US5835487A (en) * 1995-12-08 1998-11-10 Worldspace International Network, Inc. Satellite direct radio broadcast system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4720873A (en) * 1985-09-18 1988-01-19 Ricky R. Goodman Satellite audio broadcasting system
US5835487A (en) * 1995-12-08 1998-11-10 Worldspace International Network, Inc. Satellite direct radio broadcast system

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Publication number Publication date
AU2001237348A1 (en) 2001-08-07
WO2001056201A3 (fr) 2002-11-14

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