EP0283350A1 - Breitband-Datenanbieter zur Übertragung von Musik oder Bildern - Google Patents

Breitband-Datenanbieter zur Übertragung von Musik oder Bildern Download PDF

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Publication number
EP0283350A1
EP0283350A1 EP88400392A EP88400392A EP0283350A1 EP 0283350 A1 EP0283350 A1 EP 0283350A1 EP 88400392 A EP88400392 A EP 88400392A EP 88400392 A EP88400392 A EP 88400392A EP 0283350 A1 EP0283350 A1 EP 0283350A1
Authority
EP
European Patent Office
Prior art keywords
information
server
processor
music
memory
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.)
Granted
Application number
EP88400392A
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English (en)
French (fr)
Other versions
EP0283350B1 (de
Inventor
Jean Alain Sidi
Claude Bela Nogrady
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.)
XIS
Ministere des PTT
Etat Francais
France Telecom R&D SA
Original Assignee
XIS
Ministere des PTT
Etat Francais
Centre National dEtudes des Telecommunications CNET
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 XIS, Ministere des PTT, Etat Francais, Centre National dEtudes des Telecommunications CNET filed Critical XIS
Publication of EP0283350A1 publication Critical patent/EP0283350A1/de
Application granted granted Critical
Publication of EP0283350B1 publication Critical patent/EP0283350B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/38—Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/82—Wired systems using signals not modulated onto a carrier

Definitions

  • the invention relates to telematics, in particular on videocommunication networks, as well as on the integrated services digital network.
  • the object of the present invention is to allow such distribution using an n-times rewritable system, such as one or more magnetic disks.
  • the processor will look for data on a mass memory, which can be a magnetic disc or an optical disc, then it sends them on the output channel (s), by passing them through its registers or by the central memory.
  • a mass memory which can be a magnetic disc or an optical disc
  • the present invention aims to provide a solution to this problem, by proposing a new multichannel server structure, capable of operating in broadband, that is to say at a high transmission rate.
  • the proposed device comprises in combination: - a main processor, having one or more direct memory access channels (or DMA), - a large capacity mass memory, for example kind to one or more hard disks, connected to this or these direct memory access channels, and a plurality of output units, also connected to the direct memory access channel, and each having two buffer memories of the same capacity, with dual access, managed in toggle mode by an auxiliary processor, which is capable of emptying these alternating memories without discontinuity, while authorizing each time rapid filling of that of the two buffer memories which is inactive in reading, with new information.
  • the buffer memories 128 kilobytes in length, are managed by a 16-bit word processor, clocked at 8 MHz.
  • the main processor manages a catalog located in at least one hard disk from mass memory (preferably in each of the hard disks if there are several) .
  • These hard disks have a positioning time of their heads at most equal to approximately 25 milliseconds (for 16 channels), as well as a reading speed of the order of 2 Megabytes per second. This allows 128 kilobytes to be loaded into the buffer in less than 0.15 seconds. It then becomes possible to process the 16 output units continuously, which each deliver their information at just over 48 kilobytes per second to deliver 384 kilobits of sound per second.
  • the output data can be converted to analog form either immediately or after transmission over a suitable link.
  • a serial interface is provided allowing the main processor to receive information to be stored in mass memory, this storage taking place in distributed form, taking into account buffer capacity.
  • the information to be stored advantageously comes from a general server center, by fast digital network or by satellite.
  • the output units are connected to consultation stations for listening to music or viewing images on demand.
  • the consultation stations can be associated with interrogation means, in particular Minitels, allowing the selection of a piece of music or a set of images from the broadband server, which is associated with a multichannel telematics server for processing this selection information.
  • the broadband or SLB server is located in the dashed frame referenced 1.
  • This processor 10 comprises a main processor 10, with 16-bit words and clocked at 8 MHz.
  • This processor 10 has a local bus BL which communicates with a random access memory 11, a program memory not shown, and a serial interface 12. Other devices can naturally be provided.
  • the serial interface 12 is linked to a telematic server 4 to which we will return later.
  • the processor 10 also communicates by a link B with a direct memory access channel or DMA channel denoted 15.
  • This DMA channel allows the processor 10 to manage one or more hard disks 16 of large capacity. It is also connected to a series of output cards 2-1 to 2-16, to serve here 16 consultation stations, that is to say 16 users.
  • Each of these cards includes a processor 20, which is also 16-bit word and clocked at 8 MHz. It is provided with a program read-only memory 21, as well as a working working memory 22.
  • processor 20 The main function of processor 20 is to manage two buffer memories 25A and 25B, both of capacity 128 kilobytes.
  • these two buffer memories are managed toggle, that is to say that when, for example, the buffer memory 25A delivers data to the output, the processor 20 makes it impossible to enter data into this memory 25A.
  • the processor 20 makes it impossible to enter data into this memory 25A.
  • buffer memories 25A and 25B are also dual-access, that is to say that they can be controlled not only by the processor 20 which is part of the same output card, but also by the main processor 10.
  • the stage illustrated in 29 recalls that one can immediately proceed to a digital / analog conversion.
  • the main processor 10 performs the essential function of managing the catalog of the hard drive or drives 16. If there are several hard drives, it is preferable to install the catalog on each of these.
  • One of the starting points of the invention is the following remark: the main processor only has to carry out elementary instructions of the kind: - take data first, - put them in a second point.
  • FIG. 3 also shows information coming from the telematic server 4. It also shows at 110 the file management system which the broadband server 1 must have.
  • the server delivers high fidelity music information and a file corresponding to a piece of music is defined by a three-digit number.
  • the telematic server 4 will give the broadband server 1 instructions such as: deliver the file 231 on channel 12, deliver file 056 on channel 7, interrupt the delivery of file 022, deliver file 189 on channel 13, interrupt the delivery of file 206.
  • the broadband server will carry out transfers illustrated inside the block 110, which is distributed in a number of lines equal to the number of channels served.
  • the process 1 consists for example of filling the memory 25A of the card 2-1 with the data block located at the address XXXXXXXXX of the mass memory.
  • Process 2 consists in delivering to the memory 25A of channel 2-2 the block located in the hard disk at the address YYYYYYYYYY.
  • Process 3 consists in delivering to the memory 25B of channel 2-3 the block located at the address ZZZZZZZZZZZZZZZZZZ.
  • the process 15 consists in delivering to the memory 25B of the channel 2-16 the block located at the address UUUUUUUUU.
  • the process 16 consists in delivering to the memory 25A of the channel 2-16 the block located at the address VVVVVVVVVVVVV.
  • the processor 10 communicates with the telematic server 4 only at the level of complete files each corresponding to a piece of music.
  • the data is organized in blocks of fixed size, size which is preferably quite large, for example 1024 bytes.
  • the processor 10 is content to increment block addresses for the DMA channel during the reading.
  • the telematic server sends the following orders: - send piece X on channel n, - stop song X.
  • the broadband server can respond: - song X temporarily unavailable, - physical problem on track n.
  • the main processor 10 On receipt of a read order for a file x, and if all the tasks in progress are executed, the main processor 10 searches for the physical address of the requested file in the catalog located at the head of each of the disks.
  • the microprocessor 10 will then seek the beginning of the file X by a DMA line, to store it in the buffer 25A of the output channel 2-n concerned.
  • the processor 10 begins by requesting a positioning of the read head of the hard disk concerned. We now know how to make hard disks capable of positioning the head in a time at most equal to 25 milliseconds.
  • Processor 10 will only be occupied for the first two or three milliseconds. He therefore has 22 milliseconds left, during the read head positioning time, to take care of various system tasks, as well as to prepare the following process.
  • the processor 10 initiates the transfer order from the hard disk 16 to the output channel 2-n concerned.
  • the data reading speed being 1.96 megabytes per second, and the processor 10 being clocked at 8 MHz, those skilled in the art will understand that it is very easy to load a memory. buffer in less than 150 milliseconds, including hard drive read head positioning time.
  • FIG. 5 now shows how different operations relating to different exit channels are nested.
  • the processor of the broadband server 1 can take care of other processes X, Y and so on, each occupying a time of 0.15 seconds.
  • FIG. 5 shows that this occurs just before the end of the emptying of the memory 25A of this same channel 20-n.
  • the emptying time of a buffer memory A is 2.67 seconds.
  • the time interval between the end of filling of memory B and the end of emptying of memory A is 0.27 seconds (2.82 - (2.40 + 0.15)).
  • the processor 20 is of course also responsible for shaping the data and sending it to the decoding cards.
  • the server 1 communicates with hard disks 16.
  • the output channels V1 to Vn communicate for example with Minitels such as M30.
  • a serial input interface 49 is also provided, as well as a CCITT interface, noted 48.
  • This server center includes a computer, the bidirectional serial interface 59 communicates with the interface 49, for example via a public telecommunications network. Its directional interface 58 sends information to the interface 48 at a high rate, for example via a link by the TELECOM 1 satellite, the rate being 64 kilobits per second.
  • the computer 50 has an interface denoted 54 and forming a direct memory access channel for hard disks 56. It also has an analog / digital conversion input 55 suitable for receiving stereophonic musical signals with two channels L and R (for left and right) of an input string 60.
  • Figure 7 shows variants.
  • the input chain 60 can be separated from the national server center 50.
  • the service information is then transmitted through the TRANSPAC network or the switched telephone network.
  • Useful information can be transmitted at a high rate by the TELECOM 1 satellite, by TRANSPAC, by the integrated services digital network, or by a video communications network.
  • Transmission can also take place between the center national server 50 and each of the local servers, which each bring together the broadband server proper 1, and the associated telematic server 4.
  • the local consultation stations can be located in the same place as the broadband server 1. But they can also be placed remotely. In such a case, information can be exchanged through the integrated services digital network, the switched telephone network, or video communications network.
  • useful musical information can be transferred by the integrated services digital network, or by a video communications network.
  • the input station 60 can be a conventional sound input system, to obtain very good sound quality. We make sure that the converter 55 allows stereo input at 384 kilobits per second per channel. At the level of the national server center, the computer 50 ensures the recording on the hard disk (s) 56 (of very large capacity) of the music pieces in the form of frames from 64 kilobits to 384 kilobits per second and per channel. This is done through the SMD interface.
  • a selection database is updated. It is distributed to local servers through the switched telephone network.
  • the national server center can refresh the mass memories of the local servers by the unidirectional channel defined through the CCITT interfaces (V35 or X21).
  • the communication which takes place in parallel, for example by the telephone network switched over the serial interfaces allows the exchange of service information, in particular the operating balance of music pieces stored on the local server, since the last transmission. Updates are also carried out, which can be specific to each local server.
  • the service road may also allow certain remote maintenance.
  • control is ensured by the broadband server 1 from the interface V35 or X21 of the computer 4 to which it is connected by the parallel interfaces 13 and 43.
  • the telematic server receives the data block by block. It ensures good parity of the samples, and invalidates the blocks which have more than two successive erroneous samples. Each of the blocks is naturally identified by a number.
  • the operating system of the broadband server is responsible for managing the catalog of hard disks, and in particular the sectors which may have a physical problem and are noted in a report.
  • broadband server Only the broadband server is responsible for managing the hard disks as already indicated. In the event of a writing problem, it can report the problem but still try to relocate the data block that gave rise to this problem. Since only the system manager has write rights, there is no mutual exclusion problem with the hard drives of broadband servers.
  • the proposed device comprises an architecture distributed horizontally and vertically. As a result, at no point in the system is the speed required colossal.
  • the system quickly performs simple operations, which allow it to safely serve users with musical information without discontinuity, despite the sequential block processing of this information.
  • the device according to the invention takes full advantage with the availability of very large capacity hard disks (several hundred megabytes, at affordable economic conditions).

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Computer And Data Communications (AREA)
  • Communication Control (AREA)
  • Information Transfer Between Computers (AREA)
EP88400392A 1987-02-25 1988-02-19 Breitband-Datenanbieter zur Übertragung von Musik oder Bildern Expired - Lifetime EP0283350B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8702514A FR2611942B1 (fr) 1987-02-25 1987-02-25 Serveur a large bande, en particulier pour la transmission de musique ou d'images
FR8702514 1987-02-25

Publications (2)

Publication Number Publication Date
EP0283350A1 true EP0283350A1 (de) 1988-09-21
EP0283350B1 EP0283350B1 (de) 1993-01-13

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Family Applications (1)

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EP88400392A Expired - Lifetime EP0283350B1 (de) 1987-02-25 1988-02-19 Breitband-Datenanbieter zur Übertragung von Musik oder Bildern

Country Status (5)

Country Link
US (1) US4956768A (de)
EP (1) EP0283350B1 (de)
JP (1) JPS63296543A (de)
DE (1) DE3877389T2 (de)
FR (1) FR2611942B1 (de)

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Also Published As

Publication number Publication date
EP0283350B1 (de) 1993-01-13
US4956768A (en) 1990-09-11
DE3877389T2 (de) 1993-07-15
DE3877389D1 (de) 1993-02-25
FR2611942A1 (fr) 1988-09-09
JPS63296543A (ja) 1988-12-02
FR2611942B1 (fr) 1991-11-29

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