WO1992009153A1 - Procede pour la transmission simultanee de donnees sur un canal de transmission - Google Patents

Procede pour la transmission simultanee de donnees sur un canal de transmission 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
Authority
WO
WIPO (PCT)
Prior art keywords
data
transmission
binary signals
information signal
amplitude
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
PCT/DE1991/000844
Other languages
German (de)
English (en)
Inventor
Hubert Bellm
Rudi Schneider
Peter Wurll
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 AG, Siemens Corp filed Critical Siemens AG
Publication of WO1992009153A1 publication Critical patent/WO1992009153A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Dc Digital Transmission (AREA)

Abstract

L'invention concerne un procédé pour la transmission simultanée de données (D1...Dn) et d'un signal de synchronisation (T) sur un canal de transmission (K), procédé selon lequel un signal d'information discret (S) est formé par superposition de signaux binaires de même vitesse de modulation, correspondant chacun aux données (D1...Dn) d'un canal de données et au signal de synchronisation (T). Les amplitudes conférées aux signaux diffèrent entre elles selon une puissance de deux. Dans une installation de réception, on peut ainsi avoir une sélection de l'amplitude des données reçues (ED1...EDn) et du signal de synchronisation reçu (ET). Au moyen du signal de synchronisation reçu (ET) on peut fixer l'instant de la lecture des données reçues (ED1...EDn) dans une plage ne comportant pas des processus transitoires. L'invention s'applique à la transmission de données, en particulier aux systèmes de télévision pour les trains.
PCT/DE1991/000844 1990-11-12 1991-10-29 Procede pour la transmission simultanee de donnees sur un canal de transmission Ceased WO1992009153A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4035996.4 1990-11-12
DE19904035996 DE4035996A1 (de) 1990-11-12 1990-11-12 Verfahren zur simultanen uebertragung von daten auf einem uebertragungskanal

Publications (1)

Publication Number Publication Date
WO1992009153A1 true WO1992009153A1 (fr) 1992-05-29

Family

ID=6418120

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1991/000844 Ceased WO1992009153A1 (fr) 1990-11-12 1991-10-29 Procede pour la transmission simultanee de donnees sur un canal de transmission

Country Status (2)

Country Link
DE (1) DE4035996A1 (fr)
WO (1) WO1992009153A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552034A3 (en) * 1992-01-14 1995-11-08 Fujitsu Ltd Simultaneous transmission of data and analog voice-band signals
US7319418B2 (en) 2004-02-13 2008-01-15 Micronas Gmbh Sensor with multiplex data output

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4341408A1 (de) * 1993-12-04 1995-06-08 Sel Alcatel Ag Optisches System zur Übertragung eines Mehrstufensignals
DE19815011A1 (de) * 1998-04-03 1999-10-14 Temic Semiconductor Gmbh Verfahren zur Übertragung von digitalen Sendesignalen
EP1420532A1 (fr) * 2002-11-15 2004-05-19 Alcatel Dispositif et procédé de multiplexage et de transmission de signaux de données asynchrones

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940567A (en) * 1973-12-05 1976-02-24 Nissan Motor Co., Ltd. Multiplex transmission system on-off signal
JPS58131841A (ja) * 1982-01-29 1983-08-05 Advantest Corp デ−タ伝送装置
FR2615061A1 (fr) * 1987-05-07 1988-11-10 Pirelli Treficable Dispositif de transmission de signaux video multiplexes sur fibre optique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940567A (en) * 1973-12-05 1976-02-24 Nissan Motor Co., Ltd. Multiplex transmission system on-off signal
JPS58131841A (ja) * 1982-01-29 1983-08-05 Advantest Corp デ−タ伝送装置
FR2615061A1 (fr) * 1987-05-07 1988-11-10 Pirelli Treficable Dispositif de transmission de signaux video multiplexes sur fibre optique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
DE4035996A1 (de) 1992-05-14

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