WO1992009153A1 - Device for the simultaneous transmission of data on a transmission channel - Google Patents

Device for the simultaneous transmission of data on a transmission channel Download PDF

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Publication number
WO1992009153A1
WO1992009153A1 PCT/DE1991/000844 DE9100844W WO9209153A1 WO 1992009153 A1 WO1992009153 A1 WO 1992009153A1 DE 9100844 W DE9100844 W DE 9100844W WO 9209153 A1 WO9209153 A1 WO 9209153A1
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WO
WIPO (PCT)
Prior art keywords
data
transmission
binary signals
information signal
amplitude
Prior art date
Application number
PCT/DE1991/000844
Other languages
German (de)
French (fr)
Inventor
Hubert Bellm
Rudi Schneider
Peter Wurll
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1992009153A1 publication Critical patent/WO1992009153A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J7/00—Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0008—Synchronisation information channels, e.g. clock distribution lines

Definitions

  • the invention relates to a method for the simultaneous transmission of data from at least two data channels on a transmission channel according to the preamble of claim 1 and an arrangement for performing the method.
  • the method of amplitude selection for the simultaneous transmission of binary signals on a transmission channel is known from the literature (K. Steinbuch, W. Rupprecht: “News Technology", Springer-Verlag Berlin - Heidelberg - New York, 1973).
  • the required binary signals can be obtained from the video signals using the known methods of digitization.
  • the simultaneous transmission of binary signals is achieved by providing the individual signals with different amplitudes and superimposing them to form a sum signal.
  • the amplitudes differ by a power of two.
  • the sum signal obtained in this way can assume a number of discrete values corresponding to the nth power for base 2, where n is the number of binary signals.
  • an amplitude filter is required at the end of the transmission channel, which can also differentiate this number of different amplitude ranges.
  • the binary signals can then be derived from these amplitude ranges.
  • the implementation of this method presents difficulties since error pulses, pulse interruptions and pulse shortenings are caused by finite rise and fall times due to band limitation of the transmission channel.
  • the number of data channels which can be transmitted simultaneously can be increased further if the method of amplitude selection is combined with the selection by means of different modulation methods. The mentioned disadvantages of the amplitude selection remain however.
  • the invention is based on the object of determining a method for the simultaneous transmission of data on a transmission channel which suppresses interference, such as error pulses, pulse interruptions and pulse reductions, even in band-limiting systems, and to provide an arrangement for carrying out the method.
  • the method of the type mentioned at the outset has the features of claim 1.
  • An advantageous development of the method according to claims 2 or 3 enables a particularly simple derivation of the clock signal from the information signal in a receiver.
  • the method according to claim 4 allows the transmission of several information signals on a transmission channel and thus a better utilization of the channel capacity.
  • an arrangement is specified, which the implementation of the method with standard components ten such.
  • the invention according to claims 6 and 7 can advantageously be used for the parallel transmission of the image information of a video image over a radio link.
  • the invention has the advantage that, by the parallel transmission of the clock signal corresponding to the step speed, the sampling times in the receiving device can be set in a simple manner so that no transmission errors due to error pulses, pulse interruptions and pulse reductions at the outputs of the Amplitude filter arise.
  • the invention offers a better utilization of the capacity of the transmission channel. This is e.g. B. possible with amplitude modulation of the information signal due to the often high dynamic range of conventional transmission channels. High transmission rates can thus also be achieved on narrowband frequency ranges.
  • a clock generator can be dispensed with in the receiving device.
  • the clock signal in an information signal formed by superimposition has the greatest amplitude of the binary signals involved, ideal suppression of error pulses is achieved after the transmission.
  • Several information signals can be transmitted simultaneously via one transmission channel if different modulation methods are used for each information signal.
  • the clock signal can then also be transmitted separately from an information signal formed by superimposition using its own modulation method.
  • the arrangement for carrying out the method according to claims 6 and 7 can be used particularly advantageously in the transmission of the image information of video images over a radio link, since here several images correspond in a frequency range which would otherwise require the analog transmission of a single image the number of data channels can be transmitted simultaneously. Based on the drawing, in which an embodiment of the invention is shown, the invention and embodiments and advantages are explained in more detail below.
  • the figure shows a transmitting and a receiving device for the simultaneous transmission of video images.
  • Video cameras Kl ... Kn are connected to encoders Cl ... Cn, which are all supplied by a uniform clock signal T. Outputs Dl ... Dn of the encoder Cl ... Cn are combined together with the clock T to form a bus DB, which forms input signals for a digital / analog converter DAU.
  • This delivers an information signal S which is transmitted to a transmission channel K via a modulator MOD.
  • a demodulator DEM is connected to the transmission channel K, at whose output a received information signal E occurs, which is led to an analog / digital converter ADU.
  • Received data EDI ... EDn and a receive clock ET which are present at the outputs of the analog / digital converter, are led to decoders DEC1 ... DECn, which have image memories BS1 ... BSn, on which in turn monitors Ml .. Mn are connected, are connected.
  • the embodiment shown is e.g. B. applicable to train television.
  • the cameras Kl ... Kn take pictures of the train and pass them on to encoder Cl ... Cn in the form of video signals. Here they are digitized and possibly a data compression that z. B. can be carried out with the discrete cosine transformation.
  • the image information of the video images of the cameras Kl ... Kn is now available in coded form at the outputs of the encoders Cl ... Cn as data Dl ... Dn of the data channels.
  • By supplying the clock signal T to all encoders Cl ... Cn is achieved, for. B. by placing it there on the clock input of an output shift register that the data D1 ... Dn have a uniform step speed and are output synchronously.
  • the digital / analog converter is used to superimpose the binary data signals Dl ... Dn and the clock T to the information signal S in such a way that an amplitude selection is made possible.
  • z. B the data signal Dl to the digital input for the least significant bit, the data signal D2 to the digital input for the next higher order bit etc.
  • the data signals Dl ... Dn and the clock signal T are thus superimposed on the information signal S by the digital-to-analog converter DAU and represented there by signal components which differ in their amplitude by a power of two. Accordingly, the information signal S 2 n + 1 has discrete amplitude ranges.
  • the invention can be used with other amplitude ratios without restrictions.
  • the level of the information signal S should be chosen so that its maximum value corresponds to the maximum modulation stroke of the modulator MOD.
  • modulation methods according to which the modulator MOD and the demodulator DEM work all those are suitable which are suitable for the transmission of analog signals. That is e.g. B. possible with amplitude, frequency or phase modulation of a sine carrier.
  • a plurality of information signals can also be transmitted simultaneously via the channel K, the sine carrier then using combined modulation methods, eg. B. amplitude and phase modulation is modulated.
  • the transmission channel can e.g. B.
  • the demodulator DEM obtains the received information signal E from the modulated received signal. With the aid of the ADU analog / digital converter, the received data EDI ... EDn and the received clock ET are derived from it. Depending on the assignment of the digital-to-analog converter, the receive data EDI at the output for the least significant bit and the receive clock ET at the output for the most significant bit can be tapped. The received data can be subjected to pulse shaping or filtering, not shown.
  • the decoders DEC1 ... DECn whose input shift registers are all clocked with the reception clock ET, form the image information from the possibly compressed reception data EDI ... EDn, which are stored in the image memories BS1 ... BSn for generating images on the Monitors Ml ... Mn is filed. The one used in the DEC1 DECn decoders
  • the decoding method naturally corresponds to the coding method according to which the encoders Cl ... Cn operate.

Abstract

The invention relates to a process for the simultaneous transmission of data (D1...Dn) and a timing signal (T) on a transmission channel (K). A discrete information signal (S) is formed by the superimposition of binary signals of equal modulation rate corresponding to the data (D1...Dn) of a data channel and the timing signal (T). The signals are given amplitudes which differ by a power of 2. Thus, amplitude selection of received data (ED1...EDn) and the received timing signal (ET) is possible in reception unit. With the aid of the received timing signal (ET) it is possible to set the scanning time of the received data (ED1...EDn) in a region which excludes transients. The invention is applied in data transmission, especially railway TV.

Description

Verfahren zur simultanen Übertragung von Daten auf einem Übertragungskanal Method for the simultaneous transmission of data on a transmission channel
Die Erfindung bezieht sich auf ein Verfahren zur simultanen Übertragung von Daten aus mindestens zwei Datenkanälen auf einem Übertragungskanal nach dem Oberbegriff des Anspruchs 1 sowie eine Anordnung zur Durchführung des Verfahrens.The invention relates to a method for the simultaneous transmission of data from at least two data channels on a transmission channel according to the preamble of claim 1 and an arrangement for performing the method.
Aus der "French Railway Review", Vol. 2, No. 6 , 1984, Sei¬ ten 395 bis 400, ist bekannt, beim Zugfernsehen eine Übertra¬ gung von Videosignalen von auf einem Bahnsteig montierten Videokameras zu in einer Führerkabine montierten Monitoren mit einer Funkverbindung zu übertragen. Um einen etwa 300 m langen Zug zu überwachen, werden sechs Videokameras in Paaren, deren Blickwinkel entgegengesetzt ist, angeordnet. Eine Video¬ kamera deckt somit 50 m des Zuges ab. Für die Übertragung von Bildern einer Kamera ist auf der Funkstrecke eine Bandbreite von etwa 5 MHz erforderlich. Für alle sechs Videobilder würde man also einschließlich eines Bandabstands etwa 36 MHz benöti¬ gen. Da der verfügbare Frequenzbereich und der Raum in der Führerkabine begrenzt sind, werden die sechs Bilder auf drei reduziert. Bei jeder Kamera wird dazu die Hälfte des Bildes, die den der Kamera nahegelegenen Zugabschnitt in Großformat abbildet, aus dem Videobild entfernt und die beiden anderen Bildhälften, bei der gewählten Anordnung jeweils die rechte und die linke, zu einem Videobild zusammengefaßt. Durch diese Maß- nähme reduziert sich die erforderliche Bandbreite auf der Funk¬ strecke auf etwa 18 MHz. Sie erfordert allerdings eine aufwen¬ dige Synchronisation, und die einzelnen Komponenten zum Senden bzw. Empfangen sind entsprechend der Kanalzahl mehrfach vorzu¬ sehen.From the "French Railway Review", Vol. 2, No. 6, 1984, pages 395 to 400, it is known in the case of train television to transmit a transmission of video signals from video cameras mounted on a platform to monitors mounted in a driver's cab with a radio link. In order to monitor an approximately 300 m long train, six video cameras are arranged in pairs, the viewing angle of which is opposite. A video camera thus covers 50 m of the train. A bandwidth of approximately 5 MHz is required for the transmission of images from a camera on the radio link. For all six video images, including a bandgap, about 36 MHz would be required. Since the available frequency range and the space in the driver's cabin are limited, the six images are reduced to three. For each camera, half of the image, which shows the train section near the camera in large format, is removed from the video image and the two other halves of the image, the right and left in the selected arrangement, are combined to form a video image. This measure reduces the bandwidth required on the radio link to approximately 18 MHz. However, it requires complex synchronization and the individual components for sending and receiving are to be provided several times according to the number of channels.
Aus der Literatur (K. Steinbuch, W. Rupprecht: "Nachrichten¬ technik", Springer-Verlag Berlin - Heidelberg - New York, 1973) ist zur simultanen Übertragung binärer Signale auf einem Über¬ tragungskanal das Verfahren der Amplitudenselektion bekannt. Die erforderlichen binären Signale können aus den Videosignalen mit den bekannten Verfahren der Digitalisierung erhalten wer¬ den. Die simultane Übertragung binärer Signale wird bei diesem Verfahren erreicht, indem die einzelnen Signale mit verschiede- nen Amplituden versehen und zu einem Summensignal überlagert werden. Die Amplituden unterscheiden sich dabei jeweils um eine Zweierpotenz. Das so gewonnene Summensignal kann eine Anzahl diskreter Werte entsprechend der n-ten Potenz zur Basis 2 an¬ nehmen, wobei n die Zahl der binären Signale ist. Zur Trennung der binären Signale ist am Ende des Übertragungskanals ein Amplitudenfiltεr erforderlich, welches auch diese Anzahl ver¬ schiedener Amplitudenbereiche unterscheiden kann. Aus diesen Amplitudenbereichen können dann wieder die binären Signale abgeleitet werden. Die Realisierung dieses Verfahrens bereitet Schwierigkeiten, da durch endliche Anstiegs- und Abfallszeiten infolge von Bandbegrenzung des Übertragungskanals Fehlerimpul¬ se, Impulsunterbrechungen und Impulsverkürzungen hervorgerufen werden. Die Zahl der simultan übertragbaren Datenkanäle kann weiterhin erhöht werden, wenn das Verfahren der Amplituden- Selektion mit der Selektion durch unterschiedliche Modulations¬ verfahren kombiniert wird. Die genannten Nachteile der Ampli¬ tudenselektion bleiben dabei aber erhalten.The method of amplitude selection for the simultaneous transmission of binary signals on a transmission channel is known from the literature (K. Steinbuch, W. Rupprecht: "News Technology", Springer-Verlag Berlin - Heidelberg - New York, 1973). The required binary signals can be obtained from the video signals using the known methods of digitization. With this method, the simultaneous transmission of binary signals is achieved by providing the individual signals with different amplitudes and superimposing them to form a sum signal. The amplitudes differ by a power of two. The sum signal obtained in this way can assume a number of discrete values corresponding to the nth power for base 2, where n is the number of binary signals. To separate the binary signals, an amplitude filter is required at the end of the transmission channel, which can also differentiate this number of different amplitude ranges. The binary signals can then be derived from these amplitude ranges. The implementation of this method presents difficulties since error pulses, pulse interruptions and pulse shortenings are caused by finite rise and fall times due to band limitation of the transmission channel. The number of data channels which can be transmitted simultaneously can be increased further if the method of amplitude selection is combined with the selection by means of different modulation methods. The mentioned disadvantages of the amplitude selection remain however.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur simultanen Übertragung von Daten auf einem Übertragungskanal zu ermitteln, das auch in bandbegrenzenden Systemen Störungen, wie Fehlerimpulse, Impulsunterbrechungen und Impulsverkürzun¬ gen, unterdrückt, sowie eine Anordnung zur Durchführung des Verfahrens zu schaffen.The invention is based on the object of determining a method for the simultaneous transmission of data on a transmission channel which suppresses interference, such as error pulses, pulse interruptions and pulse reductions, even in band-limiting systems, and to provide an arrangement for carrying out the method.
Zur Lösung dieser Aufgabe weist das Verfahren der eingangs genannten Art die Merkmale des Anspruchs 1 auf. Eine vorteil¬ hafte Weiterbildung des Verfahrens gemäß den Ansprüchen 2 oder 3 ermöglicht eine besonders einfache Ableitung des Taktsignals vom Informationssignal in einem Empfänger. Das Verfahren nach Anspruch 4 erlaubt die Übertragung mehrerer Informationssignale auf einem Übertragungskanal und damit eine bessere Ausnutzung der Kanalkapazität. In Anspruch 5 ist eine Anordnung angegeben, welche die Durchführung des Verfahrens mit Standardbauelemen- ten, wie z. B. Digital-/Analog-Umsetzer, erlaubt. Vorteilhaft ka-nn die Erfindung gemäß den Ansprüchen 6 und 7 bei der par¬ allelen Übertragung der Bildinformation eines Videobildes über eine Funkstrecke eingesetzt werden.To achieve this object, the method of the type mentioned at the outset has the features of claim 1. An advantageous development of the method according to claims 2 or 3 enables a particularly simple derivation of the clock signal from the information signal in a receiver. The method according to claim 4 allows the transmission of several information signals on a transmission channel and thus a better utilization of the channel capacity. In claim 5 an arrangement is specified, which the implementation of the method with standard components ten such. B. digital / analog converter allowed. The invention according to claims 6 and 7 can advantageously be used for the parallel transmission of the image information of a video image over a radio link.
Die Erfindung hat den Vorteil, daß durch die parallele Über¬ tragung des der Schrittgeschwindigkeit entsprechenden Takt¬ signals die Abtastzeitpunkte in der Empfangseinrichtung auf einfache Weise so gelegt werden können, daß keine Übertragungs- fehler durch Fehlerimpulse, Impulsunterbrechungen und Impuls¬ verkürzungen an den Ausgängen des Amplitudenfilters entstehen. Gegenüber bekannten Datenübertragungsverfahren, bei denen binäre Signale verwendet werden, bietet die Erfindung eine bessere Ausnutzung der Kapazität des Übertragungskanals. Dies wird z. B. bei Amplitudenmodulation des Informationssignals aufgrund des häufig hohen Dynamikumfangs üblicher Übertragungs¬ kanäle möglich. Auch auf schmalbandigen Frequenzbereichen kön¬ nen somit hohe Übertragungsraten erreicht werden. Bei dem auf¬ grund der Verwendung eines einheitlichen Taktes synchronen Übertragungsverfahren kann in der Empfangseinrichtung auf einen Taktgenerator verzichtet werden. Es ist bei allen für analoge Signale geeigneten Modulationsverfahren anwendbar. Weist das Taktsignal in einem durch Überlagerung gebildeten Informations¬ signal von den beteiligten binären Signalen die größte Ampli- tude auf, so wird eine ideale Unterdrückung von Fehlerimpulsen nach der Übertragung erreicht. Mehrere Informationssignale kön¬ nen gleichzeitig über einen Übertragungskanal übertragen wer¬ den, wenn je Informationssignal unterschiedliche Modulations¬ verfahren angewendet werden. Das Taktsignal ist dann auch ge- trennt von einem durch Überlagerung gebildeten Informations¬ signal mit eigenem Modulationsverfahren übertragbar. Besonders vorteilhaft kann die Anordnung zur Durchführung des Verfahrens gemäß den Ansprüchen 6 und 7 bei der Übertragung der Bild¬ informationen von Videobildern über eine Funkstrecke angewendet werden, da hier in einem Frequenzbereich, den sonst die analoge Übertragung eines einzigen Bildes benötigen würde, mehrere Bilder entsprechend der Zahl der Datenkanäle gleichzeitig übertragen werden können. Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung dargestellt ist, werden im folgenden die Erfindung sowie Ausgestaltungen und Vorteile näher erläutert. Die Figur zeigt eine Sende- und eine Empfangseinrichtung zur simultanen Übertragung von Videobildern.The invention has the advantage that, by the parallel transmission of the clock signal corresponding to the step speed, the sampling times in the receiving device can be set in a simple manner so that no transmission errors due to error pulses, pulse interruptions and pulse reductions at the outputs of the Amplitude filter arise. Compared to known data transmission methods in which binary signals are used, the invention offers a better utilization of the capacity of the transmission channel. This is e.g. B. possible with amplitude modulation of the information signal due to the often high dynamic range of conventional transmission channels. High transmission rates can thus also be achieved on narrowband frequency ranges. In the case of the transmission method which is synchronous due to the use of a uniform clock, a clock generator can be dispensed with in the receiving device. It can be used with all modulation methods suitable for analog signals. If the clock signal in an information signal formed by superimposition has the greatest amplitude of the binary signals involved, ideal suppression of error pulses is achieved after the transmission. Several information signals can be transmitted simultaneously via one transmission channel if different modulation methods are used for each information signal. The clock signal can then also be transmitted separately from an information signal formed by superimposition using its own modulation method. The arrangement for carrying out the method according to claims 6 and 7 can be used particularly advantageously in the transmission of the image information of video images over a radio link, since here several images correspond in a frequency range which would otherwise require the analog transmission of a single image the number of data channels can be transmitted simultaneously. Based on the drawing, in which an embodiment of the invention is shown, the invention and embodiments and advantages are explained in more detail below. The figure shows a transmitting and a receiving device for the simultaneous transmission of video images.
Videokameras Kl ... Kn sind verbunden mit Codierern Cl ... Cn, die alle von einem einheitlichen Taktsignal T versorgt werden. Ausgänge Dl ... Dn der Codierer Cl ... Cn werden gemeinsam mit dem Takt T zu einem Bus DB zusammengefaßt, der Eingangssignale für einen Digital-/Analog-Umsetzer DAU bildet. Dieser liefert ein Informationssignal S, das über einen Modulator MOD auf einen Übertragungskanal K gegeben wird. An den Übertragungs¬ kanal K ist ein Demodulator DEM angeschlossen, an dessen Aus- gang ein empfangenes Informationssignal E auftritt, das auf einen Analog-/Digital-Umsetzer ADU geführt ist. Empfangsdaten EDI ... EDn sowie ein Empfangstakt ET, die an den Ausgängen des Analog-/Digital-Umsetzers anliegen, werden auf Decoder DEC1 ... DECn geführt, welche mit Bildspeichern BS1 ... BSn, an denen wiederum Monitore Ml ... Mn angeschlossen sind, verbunden sind.Video cameras Kl ... Kn are connected to encoders Cl ... Cn, which are all supplied by a uniform clock signal T. Outputs Dl ... Dn of the encoder Cl ... Cn are combined together with the clock T to form a bus DB, which forms input signals for a digital / analog converter DAU. This delivers an information signal S which is transmitted to a transmission channel K via a modulator MOD. A demodulator DEM is connected to the transmission channel K, at whose output a received information signal E occurs, which is led to an analog / digital converter ADU. Received data EDI ... EDn and a receive clock ET, which are present at the outputs of the analog / digital converter, are led to decoders DEC1 ... DECn, which have image memories BS1 ... BSn, on which in turn monitors Ml .. Mn are connected, are connected.
Das gezeigte Ausführungsbeispiel ist z. B. beim Zugfernsehen anwendbar. Die Kameras Kl ... Kn nehmen Bilder des Zuges auf und geben sie an Codierer Cl ... Cn in Form von Videosignalen weiter. Hier werden sie digitalisiert und eventuell einer Datenkompression, die z. B. mit der diskreten Cosinus-Trans¬ formation erfolgen kann, unterzogen. Die Bildinformation der Videobilder der Kameras Kl ... Kn liegt nun in codierter Form an den Ausgängen der Codierer Cl ... Cn als Daten Dl ... Dn der Datenkanäle vor. Durch die Zuführung des Taktsignals T zu allen Codierern Cl ... Cn wird erreicht, z. B. indem es dort auf den Takteingang eines Ausgangsschieberegisters gelegt ist, daß die Daten Dl ... Dn eine einheitliche Schrittgeschwindig¬ keit aufweisen und synchron ausgegeben werden. Der Digital-/ Analog-Umsetzer dient zur Überlagerung der binären Datensignale Dl ... Dn und des Taktes T zum Informationssignal S derart, daß eine Amplitudenselektion ermöglicht wird. Dazu werden z. B. das Datensignal Dl auf den digitalen Eingang für das niederwertig- ste Bit, das Datensignal D2 auf den digitalen Eingang für das nächst höherwertige Bit usw. gelegt. Die Datensignale Dl ... Dn und das Taktsignal T werden also durch den Digital-Analog- Umsetzer DAU zu dem Informationssignal S überlagert und dort durch Signalanteile repräsentiert, die sich jeweils in ihrer Amplitude um eine Zweierpotenz unterscheiden. Demgemäß weist das Informationssignal S 2n + 1 diskrete Amplitudenbereiche auf. Die Erfindung ist ohne Einschränkungen aber auch mit anderen Amplitudenverhältnissen anwendbar. Der Pegel des Informationssignals S sollte so gewählt werden, daß sein Maximalwert dem maximalen Modulationshub des Modulators MOD entspricht. Als Modulationsverfahren, nach denen der Modulator MOD und der Demodulator DEM arbeiten, kommen all die in Frage, die für die Übertragung analoger Signale geeignet sind. Das ist z. B. möglich mit Amplituden-, Frequenz- oder Phasenmodulation eines Sinusträgers. Der Einfachheit halber ist in dem Ausfüh¬ rungsbeispiel nur ein Informationssignal S dargestellt, erfin¬ dungsgemäß können aber auch mehrere Informationssignale gleich¬ zeitig über den Kanal K übertragen werden, wobei der Sinus¬ träger dann aber mit kombinierten Modulationsverfahren, z. B. Amplituden- und Phasenmodulation, moduliert wird. Der Über¬ tragungskanal kann z. B. repräsentiert werden durch eine Funk¬ strecke, Kabel, Lichtwellenleiter, Infrarotübertragung oder andere Übertragungsstrecken. Der Demodulator DEM gewinnt aus dem modulierten Empfangssignal das empfangene Informations- signal E. Mit Hilfe des Analog-/Digital-Umsetzers ADU werden aus ihm die Empfangsdaten EDI ... EDn und der Empfangstakt ET abgeleitet. Entsprechend der Belegung des Digital-Analog- Umsetzers sind die Empfangsdaten EDI am Ausgang für das nieder- wertigste Bit und der Empfangstakt ET am Ausgang für das höchstwertige Bit abgreifbar. Die Empfangsdaten können einer nicht dargestellten Impulsformung oder Filterung unterzogen werden. Die Decoder DEC1 ... DECn, deren Eingangsschiebe¬ register alle mit dem Empfangstakt ET getaktet werden, formen aus den eventuell komprimierten Empfangsdaten EDI ... EDn wieder die Bildinformation, die in den Bildspeichern BS1 ... BSn zur Erzeugung von Bildern auf den Monitoren Ml ... Mn abgelegt wird. Das in den Decodern DEC1 DECn verwendeteThe embodiment shown is e.g. B. applicable to train television. The cameras Kl ... Kn take pictures of the train and pass them on to encoder Cl ... Cn in the form of video signals. Here they are digitized and possibly a data compression that z. B. can be carried out with the discrete cosine transformation. The image information of the video images of the cameras Kl ... Kn is now available in coded form at the outputs of the encoders Cl ... Cn as data Dl ... Dn of the data channels. By supplying the clock signal T to all encoders Cl ... Cn is achieved, for. B. by placing it there on the clock input of an output shift register that the data D1 ... Dn have a uniform step speed and are output synchronously. The digital / analog converter is used to superimpose the binary data signals Dl ... Dn and the clock T to the information signal S in such a way that an amplitude selection is made possible. For this, z. B. the data signal Dl to the digital input for the least significant bit, the data signal D2 to the digital input for the next higher order bit etc. The data signals Dl ... Dn and the clock signal T are thus superimposed on the information signal S by the digital-to-analog converter DAU and represented there by signal components which differ in their amplitude by a power of two. Accordingly, the information signal S 2 n + 1 has discrete amplitude ranges. The invention can be used with other amplitude ratios without restrictions. The level of the information signal S should be chosen so that its maximum value corresponds to the maximum modulation stroke of the modulator MOD. As modulation methods according to which the modulator MOD and the demodulator DEM work, all those are suitable which are suitable for the transmission of analog signals. That is e.g. B. possible with amplitude, frequency or phase modulation of a sine carrier. For the sake of simplicity, only one information signal S is shown in the exemplary embodiment; however, according to the invention, a plurality of information signals can also be transmitted simultaneously via the channel K, the sine carrier then using combined modulation methods, eg. B. amplitude and phase modulation is modulated. The transmission channel can e.g. B. are represented by a radio link, cable, optical fiber, infrared transmission or other transmission paths. The demodulator DEM obtains the received information signal E from the modulated received signal. With the aid of the ADU analog / digital converter, the received data EDI ... EDn and the received clock ET are derived from it. Depending on the assignment of the digital-to-analog converter, the receive data EDI at the output for the least significant bit and the receive clock ET at the output for the most significant bit can be tapped. The received data can be subjected to pulse shaping or filtering, not shown. The decoders DEC1 ... DECn, whose input shift registers are all clocked with the reception clock ET, form the image information from the possibly compressed reception data EDI ... EDn, which are stored in the image memories BS1 ... BSn for generating images on the Monitors Ml ... Mn is filed. The one used in the DEC1 DECn decoders
Decodierverfahren entspricht dabei natürlich dem Codier¬ verfahren, nach dem die Codierer Cl ... Cn arbeiten. The decoding method naturally corresponds to the coding method according to which the encoders Cl ... Cn operate.

Claims

Patentansprüche Claims
1. Verfahren zur simultanen Übertragung von Daten oder binären Signalen gleicher Amplitude (Dl ... Dn) aus mehreren Daten- kanälen, bei dem aus den binären Signalen gleicher Amplitude binäre Signale unterschiedlicher Amplitude gleicher Schritt¬ geschwindigkeit und durch deren Überlagerung ein Informations¬ signal (S) gebildet wird, aus dem nach der Übertragung über einen Übertragungskanal durch Amplitudenselektion die binären Signale gleicher Amplitude zurückgewonnen werden, d a ¬ d u r c h g e k e n n z e i c h n e t ,1. A method for the simultaneous transmission of data or binary signals of the same amplitude (D1 ... Dn) from several data channels, in which binary signals of the same amplitude and binary signals of different amplitudes of the same step speed, and by superimposing them, an information signal (S) is formed, from which, after transmission via a transmission channel, the binary signals of the same amplitude are recovered by amplitude selection, since ¬ is characterized by
- daß als ein weiteres binäres Signal ein der Schrittgeschwin¬ digkeit entsprechendes Taktsignal (T) übertragen wird.- That a clock signal (T) corresponding to the step speed is transmitted as a further binary signal.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n ¬ z e i c h n e t ,2. The method of claim 1, d a d u r c h g e k e n n ¬ z e i c h n e t,
- daß ein Informationssignal (S) durch Überlagerung der binären Signale und des Taktsignals jeweils unterschiedlicher Ampli¬ tude gebildet wird.- That an information signal (S) is formed by superimposing the binary signals and the clock signal of different amplitudes.
3. Verfahren nach Anspruch 2, d a d u r c h g e k e n n ¬ z e i c h n e t ,3. The method according to claim 2, d a d u r c h g e k e n n ¬ z e i c h n e t,
- daß das Taktsignal in dem durch Überlagerung mit den binären Signalen unterschiedlicher Amplitude gebildeten Informations- signal (S) die größte Amplitude aufweist.- That the clock signal has the greatest amplitude in the information signal (S) formed by superposition with the binary signals of different amplitudes.
4. Verfahren nach einem der vorhergehenden Ansprüche, d a ¬ d u r c h g e k e n n z e i c h n e t ,4. The method according to any one of the preceding claims, d a ¬ d u r c h g e k e n n z e i c h n e t,
- daß je Informationssignal (S) unterschiedliche Modulations- verfahren zur Übertragung angewendet werden.- That different modulation methods are used for transmission for each information signal (S).
5. Anordnung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h ¬ n e t , - daß in einer Sendeeinrichtung je Informationssignal (S), das durch Überlagerung binärer Signale gebildet wird, ein Digi¬ tal-Analog-Umsetzer (DAU) vorhanden ist, an dessen Daten¬ eingängen eine Leitung je Datenkanal (Dl ... Dn, T) ange¬ schlossen ist und dessen analoger Ausgang auf einen Modulator (MOD) geführt ist, der dem Übertragungskanal (K) vorgeschal¬ tet ist,5. Arrangement for performing the method according to one of claims 1 to 4, characterized ¬ net, - that in a transmitter for each information signal (S), which is formed by superimposing binary signals, a Digi¬ tal-analog converter (DAU) available is at whose data inputs a line per data channel (Dl ... Dn, T) is connected and its analog output to a modulator (MOD), which is connected upstream of the transmission channel (K),
- und daß in einer Empfangseinrichtung ein Demodulator (DEM) vorhanden ist, dem je Informationssignal (S), das durch Überlagerung binärer Signale gebildet wurde, ein Analog-/- And that a demodulator (DEM) is present in a receiving device, for each information signal (S), which was formed by superimposing binary signals, an analog /
Digital-Umsetzer (ADU) zur Amplitudenselektion nachgeschaltet ist, an dessen Datenausgängen die Daten (EDI ... EDn, ET) jeweils eines Datenkanals abgreifbar sind, die mit Hilfe des Taktsignals (ET) als Daten eines der Datenkanäle abgetastet werden können.Digital converter (ADC) is connected downstream for amplitude selection, at the data outputs of which the data (EDI ... EDn, ET) of each data channel can be tapped, which can be sampled as data of one of the data channels using the clock signal (ET).
6. Anordnung nach Anspruch 5, d a d u r c h g e k e n n ¬ z e i c h n e t ,6. Arrangement according to claim 5, d a d u r c h g e k e n n ¬ z e i c h n e t,
- daß der Übertragungskanal (K) eine Funkstrecke ist.- That the transmission channel (K) is a radio link.
7. Anordnung nach Anspruch 5 oder 6, d a d u r c h g e ¬ k e n n z e i c h n e t ,7. Arrangement according to claim 5 or 6, d a d u r c h g e ¬ k e n n z e i c h n e t,
- daß die Daten (Dl ... Dn) eines Datenkanals die Bildinforma¬ tion eines Videobildes darstellen. - That the data (Dl ... Dn) of a data channel represent the picture information of a video picture.
PCT/DE1991/000844 1990-11-12 1991-10-29 Device for the simultaneous transmission of data on a transmission channel WO1992009153A1 (en)

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DE19904035996 DE4035996A1 (en) 1990-11-12 1990-11-12 METHOD FOR THE SIMULTANEOUS TRANSMISSION OF DATA ON A TRANSMISSION CHANNEL

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EP0552034A2 (en) * 1992-01-14 1993-07-21 Fujitsu Limited Simultaneous transmission of data and analog voice-band signals
US7319418B2 (en) 2004-02-13 2008-01-15 Micronas Gmbh Sensor with multiplex data output

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DE4341408A1 (en) * 1993-12-04 1995-06-08 Sel Alcatel Ag Optical system for the transmission of a multi-stage signal
DE19815011A1 (en) * 1998-04-03 1999-10-14 Temic Semiconductor Gmbh Process for the transmission of digital transmission signals
EP1420532A1 (en) * 2002-11-15 2004-05-19 Alcatel System for multiplexing and transmission of asynchronous data signals

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JPS58131841A (en) * 1982-01-29 1983-08-05 Advantest Corp Data transmitter
FR2615061A1 (en) * 1987-05-07 1988-11-10 Pirelli Treficable Device for transmitting multiplexed video signals over optical fibre

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552034A2 (en) * 1992-01-14 1993-07-21 Fujitsu Limited Simultaneous transmission of data and analog voice-band signals
EP0552034A3 (en) * 1992-01-14 1995-11-08 Fujitsu Ltd Simultaneous transmission of data and analog voice-band signals
US5710754A (en) * 1992-01-14 1998-01-20 Fujitsu Limited Multiplex transmission system wherein analog signal is transformed to base band random-transformed and superimposed on dispersed signal points in vector signal space
US6298036B1 (en) 1992-01-14 2001-10-02 Fujitsu Limited Multiplex transmission system wherein analog signal is transformed to base band, random-transformed and superimposed on dispersed signal points in vector signal space
US7319418B2 (en) 2004-02-13 2008-01-15 Micronas Gmbh Sensor with multiplex data output

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