DE3640873A1 - Method for simultaneously measuring and monitoring digital transmission characteristics of a digital video signal - Google Patents

Method for simultaneously measuring and monitoring digital transmission characteristics of a digital video signal

Info

Publication number
DE3640873A1
DE3640873A1 DE19863640873 DE3640873A DE3640873A1 DE 3640873 A1 DE3640873 A1 DE 3640873A1 DE 19863640873 DE19863640873 DE 19863640873 DE 3640873 A DE3640873 A DE 3640873A DE 3640873 A1 DE3640873 A1 DE 3640873A1
Authority
DE
Germany
Prior art keywords
digital
digital video
video signal
test line
monitoring
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Withdrawn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
DE19863640873
Other languages
German (de)
Inventor
Tibor Dipl Ing Szigeti
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.)
Rohde and Schwarz GmbH and Co KG
Siemens AG
Alcatel Lucent Deutschland AG
Original Assignee
Rohde and Schwarz GmbH and Co KG
Siemens AG
Standard Elektrik Lorenz AG
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 Rohde and Schwarz GmbH and Co KG, Siemens AG, Standard Elektrik Lorenz AG filed Critical Rohde and Schwarz GmbH and Co KG
Priority to DE19863640873 priority Critical patent/DE3640873A1/en
Publication of DE3640873A1 publication Critical patent/DE3640873A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

The test line technique of analog television transmission can also be used in principle in digital video signals. However, they can only be used for assessing the characteristics of the analog components of the system and of the A/D and D/A converters. Using the novel method, all components, including the digital components, of the system can be monitored and measured during operation. A digital test line in the form of a quasi-random sequence or a sequence of Baker codewords is inserted into a digital video signal.

Description

Die Erfindung betrifft ein Verfahren zur Messung und Über­ wachung eines digitalen Videosignals während des Betriebes. Durch die Erfindung wird die Messung und Überwachung der wichtigsten Übertragungseigenschaften des Digitalsignals wie Bitfehlerhäufigkeit, Taktversatz, innerhalb der Prüf­ zeile ermöglicht.The invention relates to a method for measuring and over monitoring of a digital video signal during operation. The measurement and monitoring of the most important transmission properties of the digital signal such as bit error rate, clock offset, within the test line enables.

In der analogen Fernsehübertragungstechnik ist die Verwendung einiger Zeilen der Vertikalaustastlücke für die Übertragung von Prüfimpulsen bekannt. Dadurch wird vom Sender bis zum Empfänger über das Video-Normpegelsignal eine Qualitätsbeurteilung er­ möglicht.The use is in analog television transmission technology a few lines of the vertical blanking interval for the transmission of Test pulses known. This is from the sender to the receiver a quality assessment via the video standard level signal possible.

Das Verfahren ist in den Richtlinien der Deutschen Bundespost für die Betriebsabwicklung automatisch überwachter Fernseh- Übertragungseirichtungen (FTZ 155 R 160) beschrieben.The procedure is in the guidelines of the Deutsche Bundespost for the operation of automatically monitored television Transmission devices (FTZ 155 R 160) described.

Bei digitalen Videosignalen ist die Prüfzeilentechnik der analogen Fernsehübertragung prinzipiell auch anwendbar, doch können dadurch nur die Eigenschaften der analogen Komponenten des Systems sowie die der A/D- und D/A-Wandler beurteilt werden.For digital video signals, the test line technology is the analog television broadcasting also applicable in principle, but only the properties of the analog components of the system and that of the A / D and D / A converters will.

Zur Qualitätsbeurteilung der digitalen Übertragungssignale muß man die wichtigsten Übertragungseigenschaften wie Bitfehlerrate, Taktversatz messen können. For quality assessment of digital transmission signals one has the most important transmission properties like Bit error rate, clock offset can measure.  

Bei bisher bekannt gewordenen Vorschlägen für Pulsrahmen von digitalen Videosignalen fehlt die Möglichkeit der Beurteilung der digitalen Übertragungseigenschaften des Übertragungs­ systems.In previously known proposals for pulse frames from digital video signals lack the possibility of assessment the digital transmission properties of the transmission systems.

Die der Erfindung zugrunde liegende Aufgabe, die digitalen Übertragungseigenschaften digitaler Videosignale während des Betriebes zu überwachen und zu messen, wird durch die im Hauptanspruch gekennzeichnete Erfindung gelöst.The object underlying the invention, the digital Transmission properties of digital video signals during the Monitoring and measuring operations is carried out by the im Main claim characterized invention solved.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen ge­ kennzeichnet.Advantageous further developments are in the subclaims indicates.

Ein Ausführungsbeispiel der Erfindung wird im folgenden näher beschrieben.An embodiment of the invention is described in more detail below described.

Ein Pulsrahmen für ein digitales Videosignal z. B. für eine Bitrate von 135 Mbit/s - bei einer anderen Bitrate ist gleichermaßen zu verfahren - mit einer Pulsrahmendauer von 40 ms und einer Zeilenzahl von 625 Zeilen enthält 8640 bit pro Zeile.A pulse frame for a digital video signal e.g. B. for a bit rate of 135 Mbit / s - with another bit rate the same procedure is to be followed - with a pulse frame duration of 40 ms and a number of lines of 625 lines contains 8640 bits per line.

Der Rahmen beginnt mit dem Synchronwort von z. B. 64 bit am Anfang der ersten Zeile. Analog zur Vorschrift für die analogen Prüfzeilen ist als digitale Prüfzeile für das 1. Halbbild die 17. Zeile und das für das 2. Halbbild die 330. Zeile nutzbar. The frame begins with the sync word from z. B. 64 bit at the beginning of the first line. Analogous to the regulation for the analog test lines is a digital test line for that 1st field the 17th line and that for the 2nd field the 330th line can be used.  

Als Prüfsignale können entweder eine Quasizufallsfolge von 213-1=8191 bit-Länge oder eine Bitfolge von 135× 64 bit eingefügt werden. Bei den Codeworten zu 64 bit kann es sich um invertierte Barker-Codeworte handeln, wie sie im EBU- Dokument SPB 284, April 1985, Seite 9 beschrieben sind.Either a quasi-random sequence of 2 13 -1 = 8191 bit length or a bit sequence of 135 × 64 bit can be inserted as test signals. The 64-bit code words can be inverted Barker code words as described in EBU document SPB 284, April 1985, page 9.

Die digitale Prüfzeile ist überall dort anwendbar, wo innerhalb des Rahmens keine Betriebssignale übertragen werden. Dadurch können während des Betriebes digitale Parameter gemes­ sen und angezeigt werden.The digital test line can be used wherever no operating signals are transmitted within the frame. As a result, digital parameters can be measured during operation and displayed.

Claims (4)

1. Verfahren zur gleichzeitigen Messung und Überwachung von digitalen Übertragungseigenschaften eines digitalen Videosignals mit beliebiger Rahmenstruktur während des Betriebes, dadurch gekennzeichnet, daß eine analoge Prüfzeile durch eine digitale Prüf­ zeile ersetzt ist.1. A method for the simultaneous measurement and monitoring of digital transmission properties of a digital video signal with any frame structure during operation, characterized in that an analog test line is replaced by a digital test line. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß jeder Halbrahmen einer Zeile als digitale Prüfzeile nutzbar ist.2. The method according to claim 1, characterized in that each half frame of a line as a digital test line is usable. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die digitale Prüfzeile eine Quasi-Zufallsfolge beinhaltet.3. The method according to claim 1, characterized in that the digital test line contains a quasi-random sequence. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die digitale Prüfzeile eine Folge von Barker-Codewörtern be­ inhaltet.4. The method according to claim 1, characterized in that the digital check line be a sequence of Barker code words contains.
DE19863640873 1986-11-29 1986-11-29 Method for simultaneously measuring and monitoring digital transmission characteristics of a digital video signal Withdrawn DE3640873A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863640873 DE3640873A1 (en) 1986-11-29 1986-11-29 Method for simultaneously measuring and monitoring digital transmission characteristics of a digital video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863640873 DE3640873A1 (en) 1986-11-29 1986-11-29 Method for simultaneously measuring and monitoring digital transmission characteristics of a digital video signal

Publications (1)

Publication Number Publication Date
DE3640873A1 true DE3640873A1 (en) 1988-06-09

Family

ID=6315117

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863640873 Withdrawn DE3640873A1 (en) 1986-11-29 1986-11-29 Method for simultaneously measuring and monitoring digital transmission characteristics of a digital video signal

Country Status (1)

Country Link
DE (1) DE3640873A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0897248A2 (en) * 1997-08-11 1999-02-17 Nds Limited Glitch detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0897248A2 (en) * 1997-08-11 1999-02-17 Nds Limited Glitch detector
EP0897248A3 (en) * 1997-08-11 2001-03-07 Nds Limited Glitch detector

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