DE3128829A1 - Method for transmitting digital data by means of television signals - Google Patents

Method for transmitting digital data by means of television signals

Info

Publication number
DE3128829A1
DE3128829A1 DE19813128829 DE3128829A DE3128829A1 DE 3128829 A1 DE3128829 A1 DE 3128829A1 DE 19813128829 DE19813128829 DE 19813128829 DE 3128829 A DE3128829 A DE 3128829A DE 3128829 A1 DE3128829 A1 DE 3128829A1
Authority
DE
Germany
Prior art keywords
signal
television signal
digital
amplitude
television
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.)
Withdrawn
Application number
DE19813128829
Other languages
German (de)
Inventor
Jivko Yordanov Dipl.-Ing. Sofjia Jelezov
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.)
Isot DSO
Original Assignee
Isot DSO
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 Isot DSO filed Critical Isot DSO
Publication of DE3128829A1 publication Critical patent/DE3128829A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04N7/081—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 the additional information signals being transmitted by means of a subcarrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

To transmit digital data simultaneously with the television signal in the simplest possible manner without impairing the television image, a method for transmitting digital data by means of television signals is proposed in which a signal of 5 to 6 MHz and an amplitude which is lower than 10% of the television signal amplitude is modulated with the digital signals to be transmitted and the television signal is converted into a digital signal. This is stored and analysed, those sections in which the television signal does not change its amplitude by more than 5% of the total amplitude of the signal in a time interval which is greater than 10% of the interval between the line blanking pulses of the television signal being determined. The digitised television signal which, in turn, is converted into an analog signal, is transmitted and at the same time formatted so that a modulated service information which specifies the length of the respective digital section and the time of the beginning of the next digital section is introduced at the start of each digital section. <IMAGE>

Description

Beschreibungdescription

Die Erfindung betrifft ein Verfahren zur übertragung von digitalen Daten mittels Fernsehsignalen, das bei Systemen zur Datenfernübertragung anwendbar ist.The invention relates to a method for transmitting digital Data by means of television signals, which can be used in systems for remote data transmission is.

Bei einem bekannten Verfahren zur Übertragung von digitalen Daten mittels Fernsehsignalen wird mit den zu übertragenden digitalen Daten ein Signal mit einer Frequenz von 5 bis 6 MHz und einer Amplitude, die kleiner als 10 % der Amplitude des Fernsehsignals ist, nach einer an sich bekannten Weise moduliert. Aus den modulierten digitalen Folgen werden Gruppen gebildet, die nicht länger als das Zeitintervall.. zwischen den Zeilenaustastimpulsen des-Fernsehsignals sind. In der Sende station werden diese Gruppen in das Fernsehsignal eingeführt und zwar mit der Polarität des weißen Niveaus, falls das Fernsehsignal in der Zone zwischen dem mittleren Niveau des Fernsehsignals und dem schwarzen Niveau liegt, und mit der Polarität des schwarzen Niveaus, falls das Fernsehsignal in der Zone zwischen dem mittleren Niveau des Fernsehsignals und dem weißen Niveau liegt.In a known method for the transmission of digital data by means of television signals, a signal is created with the digital data to be transmitted with a frequency of 5 to 6 MHz and an amplitude that is less than 10% of the The amplitude of the television signal is modulated in a manner known per se. Groups are formed from the modulated digital sequences that are no longer than are the time interval ... between the line blanking pulses of the television signal. In the broadcast station, these groups are introduced into the television signal with the polarity of the white level if the television signal is in the zone between the middle level of the television signal and the black level, and with the polarity of the black level if the television signal is in the zone between the middle level of the television signal and the white level.

Dieses Verfahren hat den Nachteil, daß die auf diese Weise eingeführten Folgen die Qualität des Fernsehbildes dort, wo die Funktion des Fernsehsignals genügend steil ist, verschlechtern. Außerdem ist die Rückgewinnung der digitalen Daten erschwert, was die Verwendung von komplizierten Methoden zur Kodierung der digitalen Daten erfordert.This method has the disadvantage that the introduced in this way Follow the quality of the television picture where the function of the television signal is sufficient is steep, worsen. In addition, the recovery of the digital data is more difficult, what the use of complicated methods to encode the digital data requires.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Übertragung von digitalen-Daten mittels Fernsehsignalen zu schaffen, das die Übertragung der digitalen Daten gleichzeitig mit dem aktiven Fernsehsignal ermöglicht, ohne das Fernsehbild zu verschlechtern, und das keine komplizierten Methoden zur Kodierung der zu übertragenden digitalen Daten erfordert.The invention is based on the object of a method for transmission of digital data by means of television signals to create the transmission of the digital data at the same time as the active television signal, without the Television picture to deteriorate, and no complicated methods of coding the ones to be transmitted digital data.

Diese Aufgabe wird durch die im Patentanspruch beschriebene Erfindung gelöst.This object is achieved by the invention described in the claim solved.

Das erfindungsgemäße Verfahren hat den Vorteil, daß die übertragenen digitalen Daten die Qualität des Fernsehbildes nicht verschlechtern und außerdem die Übertragungszuverlässigkeit größer ist.The inventive method has the advantage that the transferred digital data does not degrade the quality of the television picture and moreover the transmission reliability is greater.

Die Erfindung wird anhand einer Vorrichtung, deren Prinzipschaltbild in der beigefügten Zeichnung angegeben ist, näher erläutert.The invention is based on a device, the basic circuit diagram is indicated in the accompanying drawing, explained in more detail.

Das Fernsehsignal wird mit Hilfe eines Analog-pigital-Wandlers 1 in ein digitales Signal umgesetzt und im Speicher 2 gespeichert. Die gespeicherte Information wird in der arithmetisch-logischen Einheit 3 bearbeitet, wobei die im Fernsehsignal vorhandenen digitalen Abschnitte nach dem oben beschriebenen Verfahren bestimmt werden, d.h. im Fernsehsignal werden solche Abschnitte festgestellt, in denen sich seine Amplitude um nicht mehr als 5 % der ganzen Amplitude des Signals verändert, bezogen auf ein Zeitintervall, das nicht größer als 10 % des Intervalls zwischen den Zeilenaustastimpulsen des Fernsehsignals ist. Danach wird das digitalisierte Fernsehsignal mit Hilfe des Digital-Analog-Umwandlers 4 wieder in ein Analog-Signal umgewandelt und in der Modulator-Mischschaltung 5 formatiert, wobei am Anfang jedes digitalen Abschnittes eine Dienstinformation für die Länge' des betreffenden Abschnittes und den Zeitpunkt des Beginns des nächsten digitalen Abschnittes angegeben wird.The television signal is converted with the aid of an analog-to-digital converter 1 in converted a digital signal and stored in memory 2. The stored information is processed in the arithmetic-logic unit 3, the television signal existing digital sections determined according to the method described above , i.e. in the television signal such sections are found in which changes its amplitude by no more than 5% of the total amplitude of the signal, based on a time interval that is not greater than 10% of the interval between the line blanking pulses of the television signal. Then the digitized Television signal with the aid of the digital-to-analog converter 4 back into an analog signal converted and formatted in the modulator mixing circuit 5, with each digital section a service information for the length 'of the section concerned and the time of the beginning of the next digital section is given.

Die die Nutzinformation enthaltenden modulierten digitalen Folgen werden in den jeweiligen digitalen Abschnitten mit Hilfe einer Eingabe-Einheit 6 eingeführt, die an jeden beliebigen Punkt des Weges des Fernsehsignals eingeschaltet werden kann. Die Steuereinheit 7 synchronisiert und steuert die Arbeit der Vorrichtung.The modulated digital ones containing the useful information follow are in the respective digital sections with the help of an input unit 6 introduced that turned on at any point along the path of the television signal can be. The control unit 7 synchronizes and controls the operation of the device.

LeerseiteBlank page

Claims (1)

VERFAHREN ZUR UBERTRAGUNG VON DIGITALEN DATEN MITTELS FERNSEHSIGNALEN P a t e n t a n s p r u c h Verfahren zur Übertragung von digitalen Daten mittels Fernsehsignalen, bei dem mit den zu übertragenden digitalen Daten- ein Signal mit einer Frequenz von 5 bis 6 MHz und einer Amplitude, die kleiner als 10 % der Amplitude des Fernsehsignals ist, nach einer an sich bekannten Weise moduliert wird, dadurch g e k e n n z e i c h n e t, daß das Fernsehsignal.in ein digitales Signal.umgewandelt wird, das anschließend gespeichert und analysiert wird, wobei im digitalisierten Fernsehsignal digitale Abschnitte bestimmt werden, in denen das Fernsehsignal seine Amplitude um nicht mehr als 5 % der ganzen Amplitude des Signals in einem Zeitintervall ändert, das größer als 10 % des Intervalls zwischen den Zeilenaustastimpulsendes Fernsehsignals ist, daß danach das digitalisierte Fernsehsignal wieder in ein Analog-Signal umgeaetzt -und gesendet wird, wobei das Fernsehsignal formatiert wird, so daB am Anfang jedes digitalen Abschittes eine mit einer Frequenz von 5 bis 6 MFIz und einer Amplitude,-die kleiner als 10 % der Amplitude des Fernsehsignals iStr modulierte Dienstinformation eingeführt -wird, die die Länge des jeweiligen digitalen Abschnittes und den Zeitpunkt des Beginns des nächsten digitalen Abschnittes angibt, wobei die Dien@@| information für den Beginn des ersten digitalen Abschnittes von dem gegebenen Teilbild an einem vorbestimmten Platz des Fernsehsignals angegeben wird, und im übrigen Teil jedes digitalen Abschnittes die-modulierten digitalen Folgen eingeführt werden, was in jedem Punkt des Weges des Fernsehsignals geschehen~kånn.METHOD FOR TRANSMISSION OF DIGITAL DATA BY TELEVISION SIGNALS P a t e n t a n s p r u c h Process for the transmission of digital data by means of Television signals, in which with the digital data to be transmitted a signal with a frequency of 5 to 6 MHz and an amplitude that is less than 10% of the amplitude of the television signal is modulated in a manner known per se thereby it is not noted that the television signal has been converted into a digital signal which is then stored and analyzed, with the digitized Television signal digital sections are determined in which the television signal is his Amplitude by no more than 5% of the full amplitude of the signal in a time interval changes that is greater than 10% of the interval between the end of the line blanking pulses Television signal is that afterwards the digitized television signal again converted into an analog signal and sent, the television signal being formatted so that at the beginning of each digital section one with a frequency of 5 up to 6 MFIz and an amplitude that is less than 10% of the amplitude of the television signal iStr modulated service information is introduced -is the length of the respective digital section and the time of the start of the next digital section indicates, where the Dien @@ | information for the beginning of the first digital section indicated by the given field at a predetermined position of the television signal is, and in the rest of each digital section die-modulated digital Follows are introduced what can happen at any point along the path of the television signal ~ kånn.
DE19813128829 1980-07-22 1981-07-21 Method for transmitting digital data by means of television signals Withdrawn DE3128829A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG8048569A BG30754A1 (en) 1980-07-22 1980-07-22 A method of transmitting digital data through a television signal

Publications (1)

Publication Number Publication Date
DE3128829A1 true DE3128829A1 (en) 1982-05-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19813128829 Withdrawn DE3128829A1 (en) 1980-07-22 1981-07-21 Method for transmitting digital data by means of television signals

Country Status (5)

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JP (1) JPS5787289A (en)
BG (1) BG30754A1 (en)
CS (1) CS560381A1 (en)
DD (1) DD230401A3 (en)
DE (1) DE3128829A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004100A1 (en) * 1987-10-20 1989-05-05 Interactive Systems, Inc. Interactive video method and apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2354197A1 (en) * 1972-10-30 1974-05-09 Hazeltine Research Inc METHOD AND SYSTEM FOR TRANSMISSION AND RECEPTION OF A COLOR TV SIGNAL AND ADDITIONAL INFORMATION
DE1537434B2 (en) * 1967-12-21 1976-01-29 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENTS FOR THE TRANSMISSION OF IMPULSIVE SOUND AND OTHER INFORMATION IN VIDEO TAPE IN TELEVISION, IN PARTICULAR TELEVISION TELEPHONE SYSTEMS
US3984624A (en) * 1974-07-25 1976-10-05 Weston Instruments, Inc. Video system for conveying digital and analog information

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1537434B2 (en) * 1967-12-21 1976-01-29 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENTS FOR THE TRANSMISSION OF IMPULSIVE SOUND AND OTHER INFORMATION IN VIDEO TAPE IN TELEVISION, IN PARTICULAR TELEVISION TELEPHONE SYSTEMS
DE2354197A1 (en) * 1972-10-30 1974-05-09 Hazeltine Research Inc METHOD AND SYSTEM FOR TRANSMISSION AND RECEPTION OF A COLOR TV SIGNAL AND ADDITIONAL INFORMATION
US3984624A (en) * 1974-07-25 1976-10-05 Weston Instruments, Inc. Video system for conveying digital and analog information

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
US-Z: IEEE Trasnaction on Broadcast and TV Receivers, Vol. BTR-19, Nov. 1973, H.4., S. 225-229 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004100A1 (en) * 1987-10-20 1989-05-05 Interactive Systems, Inc. Interactive video method and apparatus
GR1000595B (en) * 1987-10-20 1992-08-26 Interactive Systems Interactive method and video set

Also Published As

Publication number Publication date
BG30754A1 (en) 1982-12-15
DD230401A3 (en) 1985-11-27
CS560381A1 (en) 1984-11-19
JPS5787289A (en) 1982-05-31

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