EP0536188A1 - Systeme de transmission et de decodage de donnees codees en biphase, notamment pour vps - Google Patents

Systeme de transmission et de decodage de donnees codees en biphase, notamment pour vps

Info

Publication number
EP0536188A1
EP0536188A1 EP91911220A EP91911220A EP0536188A1 EP 0536188 A1 EP0536188 A1 EP 0536188A1 EP 91911220 A EP91911220 A EP 91911220A EP 91911220 A EP91911220 A EP 91911220A EP 0536188 A1 EP0536188 A1 EP 0536188A1
Authority
EP
European Patent Office
Prior art keywords
data
line
biphase
vps
video signal
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.)
Ceased
Application number
EP91911220A
Other languages
German (de)
English (en)
Inventor
Arthur Heller
Klaus Schuster
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.)
Deutsche Thomson oHG
Original Assignee
Telefunken Fernseh und Rundfunk GmbH
Thomson Consumer Electronics Sales 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 Telefunken Fernseh und Rundfunk GmbH, Thomson Consumer Electronics Sales GmbH filed Critical Telefunken Fernseh und Rundfunk GmbH
Publication of EP0536188A1 publication Critical patent/EP0536188A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
    • H04N7/035—Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0887—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of programme or channel identifying signals

Definitions

  • the invention relates to a system according to the preamble of the claim.
  • a system of this type is known from "Rundffunkchnic Mitteilungen", vol. 16 (1972), number 2, pages 90 and 91.
  • Radio communications communications 16 (1972) number 2, pages 90 and 91) is based on the simultaneous use of a complementary pair of lines, namely the lines 16 and 329 for one and the same data, as can be seen in Figures 5 and 7 of this publication.
  • each of the two blanking lines 16 and 329 was assigned a separate "service": line 16 became source-related, line 329 section-related data line for internal identification and monitoring purposes. This also made it necessary to make a field selection on the receiving side in order to be able to distinguish between the two services, which use an identical data format including the start code.
  • VPS system also assumes these conditions (Technical Guideline ARD / ZDF No. 8 R 2, 1st edition Dec. 84 / Febr. 85). There, in addition to the field selection, a windowing on line 16 is required (page 7 of this guideline), in particular in order to exclude the teletext data transmitted in the same field.
  • a disadvantage of this decoding concept is first of all the noteworthy additional outlay for an amplitude sieve for separating the synchronous signal mixture from the video signal and also for a device for selecting the odd field and finally for a line counter.
  • the devices for field selection often work relatively unreliably when they are offered video signals that are contrary to standards, e.g. those with luminance components below black in the area of the last active lines of a field.
  • VPS decoders would function independently of the line or field position of the associated biphase data line, that is if any blanking line could be used for VPS transmission, and without Variation of a selection criterion on the decoder.
  • the object of the present invention is to provide a system for the transmission and decoding of biphase data which, in the case of a fixed decoder configuration, permits the free choice of the line and field position for the data line used, nevertheless high protection against confusion against others which simultaneously transmit in the same video signal ⁇ offers data services and also reduces the effort in the decoder.
  • the invention is explained in more detail with reference to the drawing.
  • the figure shows a block diagram of a data line decoder suitable for the system according to the invention.
  • the video signal 11 supplied to the decoder input 1 contains, as is the case in reality, several independent data services in its vertical blanking interval, for example NP.Z-coded video text codes in a few lines, and for example two biphase-coded services, for example one in-house (of Broadcasting and / or post) used section data line and the source data line used for VPS.
  • NP.Z-coded video text codes in a few lines
  • biphase-coded services for example one in-house (of Broadcasting and / or post) used section data line and the source data line used for VPS.
  • position it must be irrelevant for the decoder of the respective service in which line position the data of the service in question are transmitted.
  • each biphase-coded data service must use an individual start code.
  • the VPS and source data line can use the bit element pattern defined in the VPS specification
  • Both patterns must violate the antivalence rule valid in the useful data area, e.g. contain three logical zero elements or three logical one elements in succession.
  • the entire video signal 11 is fed directly to the data separation stage 2 and also to the clock processing stage 3 without field field windowing and one line deletion.
  • the latter derives the associated system clock from the data sequence and provides it at its output 32 in the correct phase to the data present at the data separation stage 2 at its output 22.
  • a level discriminator with an optionally adaptively controlled decision threshold at 50% of the video data amplitude serves as data separation stage 2.
  • the video signal 11 shaped in this way to form the two-phase signal 11 ' is no longer subjected to field window or line windowing in the further course of the decoding process, but rather directly to the start code checking device 4, the antivalency checking device 5 and the buffer memory 6 together with the system clock from output 32.
  • the start code checking device 4 contains e.g. a binary comparator, to which the start code bit element pattern (see above) of the biphase service to be decoded is constantly applied, and whose actual value inputs are connected to the outputs of a parallel input slider video signal 11 '. If the setpoint and actual values are the same, the presence of the true start code in the assigned data line or even just a supposed start code is signaled at the output 41 as a random constellation, for example in a video text line or even in its image content line.
  • a binary comparator to which the start code bit element pattern (see above) of the biphase service to be decoded is constantly applied, and whose actual value inputs are connected to the outputs of a parallel input slider video signal 11 '. If the setpoint and actual values are the same, the presence of the true start code in the assigned data line or even just a supposed start code is signaled at the output 41 as a random constellation, for example in a video text line or even in its image content line.
  • the equality signal at the output 41 reports via the input 51 of the antivalence test device 5 the phase of the bits to be compared from now on (a detailed explanation can be found in the German patent specification DE 30 20 530) and is also supplied to the control logic 7. This is so designed that only aan at the control logic output 73 a takeover pulse occurs if between Star code detection at input 71 and at the end of the transmission of the last useful bit (ie after 208 systems from start code message), no unique antivalence sensor has been signaled via input 72.
  • the take-over pulse from the output 73 causes the data temporarily stored in the buffer 6 in the course of the data transfer to be transferred to the output memory 8 and is available at its output 81 as information which has been checked for errors and service assignments.
  • start code checking device 4 could incorrectly hold for a biphase data line due to the lack of a window, for example, a video text line or image content lines.
  • the 16 elements of the start code require a probability of 1: 65000 for such an implementation, which can worsen if spectrally similar random data signals such as teletext are to be excluded. This is not sufficient for secure decoding.
  • the first useful word one does not rely on the fact that this word itself does not show an active error - this could also happen to cause a video text line. Rather, the first useful word is only regarded as belonging to the desired service and as being transmitted incorrectly, even if none of the most important twelve useful words has not been de-tected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

Un système de transmission et de décodage de données codées en biphase ajoutées à un signal vidéo, dans les intervalles de suppression de celui-ci, par exemple pour VPS, permet de sélectionner librement la position de la ligne de transmission avec une configuration fixe du décodeur, de sorte que dans le cas de VPS on peut utiliser n'importe quelle ligne, au lieu de la 16e ligne, ce qui est important lors de l'introduction du système à l'étranger. Lorsque plusieurs services de données en biphase sont transmis dans le signal de télévision, chaque service de données reçoit un code différent de démarrage. Dans le décodeur, le signal vidéo est transféré au discriminateur de niveau, qui agit comme étage séparateur de données (2), ou au dispositif (4) de contrôle du code de démarrage et au dispositif de contrôle (5) de l'anticoïncidence, montés en aval sans aucun fenêtrage de trame ni de lignes. En d'autres termes, le code de démarrage, puis les défauts de biphase de toutes les lignes de vidéotexte, ainsi que de toutes les lignes du contenu vidéo, sont contrôlés. Afin d'exclure toute possibilité de confusion, tous les 208 éléments des 13 multiplets utiles d'une ligne de données en biphase VPS servent presque de mot de synchronisation allongé, mais non rigide, qui se distingue d'une séquence aléatoire par un facteur supérieur à 1030 lors du contrôle de l'anticoïncidence biphase. A cet effet, tous les multiplets utiles ne sont admis comme étant sans défauts et transférés d'une mémoire temporaire (6) à une mémoire de sortie (8) que lorsqu'aucun défaut d'anticoïncidence n'a été détecté depuis le code de démarrage reconnu jusqu'au dernier bit utile à la fin de la ligne de données.
EP91911220A 1990-06-23 1991-06-15 Systeme de transmission et de decodage de donnees codees en biphase, notamment pour vps Ceased EP0536188A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020066 1990-06-23
DE4020066A DE4020066A1 (de) 1990-06-23 1990-06-23 System zur uebertragung und decodierung biphasecodierter, einem videosignal in dessen vertikaler austastluecke beigefuegter daten, insbesondere fuer vps

Publications (1)

Publication Number Publication Date
EP0536188A1 true EP0536188A1 (fr) 1993-04-14

Family

ID=6408954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91911220A Ceased EP0536188A1 (fr) 1990-06-23 1991-06-15 Systeme de transmission et de decodage de donnees codees en biphase, notamment pour vps

Country Status (7)

Country Link
US (1) US5627595A (fr)
EP (1) EP0536188A1 (fr)
JP (1) JPH05508063A (fr)
AU (1) AU7968791A (fr)
DE (1) DE4020066A1 (fr)
HU (1) HUT63019A (fr)
WO (1) WO1992000648A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9206495D0 (en) * 1992-03-25 1992-05-06 Philips Electronics Uk Ltd Receiving data signals
CA2180023A1 (fr) * 1994-10-28 1996-05-09 Johannes Yzebrand Tichelaar Decodage d'un signal de donnees transmis dans un systeme de television

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1486771A (en) * 1973-07-30 1977-09-21 Indep Broadcasting Authority Television systems
US4025851A (en) * 1975-11-28 1977-05-24 A.C. Nielsen Company Automatic monitor for programs broadcast
GB1523307A (en) * 1975-12-09 1978-08-31 Aston Electronic Dev Data slicing apparatus and method
DE3020530C2 (de) * 1980-05-30 1981-12-10 Institut für Rundfunktechnik GmbH, 8000 München Verfahren und Schaltungsanordnung zum Erkennen von Übertragungsfehlern bei einer seriellen, bi-phase-modulierten Datenübertragung
US4805020A (en) * 1983-03-21 1989-02-14 Greenberg Burton L Television program transmission verification method and apparatus
JPS61264883A (ja) * 1985-05-20 1986-11-22 Fujitsu General Ltd スライスレベル制御回路
JPS6235789A (ja) * 1985-08-08 1987-02-16 Nec Corp デ−タ分離回路
DE3629227A1 (de) * 1985-08-29 1987-03-05 Victor Company Of Japan Demodulationsschaltung zur demodulation eines zweiphasig modulierten signals
JPS6284688A (ja) * 1985-10-09 1987-04-18 Toshiba Corp オ−トスライス回路
JPS63144676A (ja) * 1986-12-09 1988-06-16 Sony Corp デ−タデコ−ダ装置
FR2608873B1 (fr) * 1986-12-23 1989-03-24 Radiotechnique Compelec Dispositif de reception de donnees numeriques comportant un circuit de reconnaissance de debut de paquet
WO1989005555A1 (fr) * 1987-12-07 1989-06-15 British Broadcasting Corporation Transmission de donnees en periode d'image active
FR2652697A1 (fr) * 1989-10-03 1991-04-05 Sgs Thomson Microelectronics Extracteur de donnees numeriques dans un signal video.
JPH04246987A (ja) * 1991-01-31 1992-09-02 Sony Corp 記録再生装置
US5223930A (en) * 1991-10-18 1993-06-29 Zenith Electronics Corporation Data recovery system using dot clock counting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9200648A1 *

Also Published As

Publication number Publication date
JPH05508063A (ja) 1993-11-11
DE4020066C2 (fr) 1992-09-03
HUT63019A (en) 1993-06-28
HU9203810D0 (en) 1993-03-29
US5627595A (en) 1997-05-06
DE4020066A1 (de) 1992-01-09
WO1992000648A1 (fr) 1992-01-09
AU7968791A (en) 1992-01-23

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