DE755706C - Method for generating line characters and alternating picture characters in television broadcasters - Google Patents

Method for generating line characters and alternating picture characters in television broadcasters

Info

Publication number
DE755706C
DE755706C DER104698D DER0104698D DE755706C DE 755706 C DE755706 C DE 755706C DE R104698 D DER104698 D DE R104698D DE R0104698 D DER0104698 D DE R0104698D DE 755706 C DE755706 C DE 755706C
Authority
DE
Germany
Prior art keywords
characters
line
change
disc
pulses
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.)
Expired
Application number
DER104698D
Other languages
German (de)
Inventor
Kurt Dr Schlesinger
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.)
Opta Radio A G
Original Assignee
Opta Radio A G
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 Opta Radio A G filed Critical Opta Radio A G
Priority to DER104698D priority Critical patent/DE755706C/en
Application granted granted Critical
Publication of DE755706C publication Critical patent/DE755706C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Description

Verfahren zur Erzeugung der Zeilen- und Bildwechselzeichen bei Fernsehsendern Bei der Abtastung von Fernsehbildern mittels einer Lochscheibe werden die Synchronisierzeichen bekanntlich ebenfalls durch diese umlaufende Scheibe erzeugt. Die Synchronisieröffnungen oder -schlitze sind auf der Abtastscheibe in einem Kreis angeordnet und lassen beim Umlauf der Scheibe den Lichtstrahl auf die besondere Synchronisierphotozelle fallen. Dadurch werden in der Photozellenanordnung die zur Synchronisierung des Zeilenwechsels dienenden Impulse erzeugt. Zur Synchronisierung des Bildwechsels wiTd: für jeden Bildwechsel bzw. beim Zeilensprungverfahren für jeden Zeilenzugwechsel nur ein einzelner Impuls benötigt. Zur Erzeugung dieser Impulse erhält deshalb die Abtastscheibe einen besonderen Schlitz.Method for generating line and picture characters in television broadcasters When scanning television images by means of a perforated disc, the synchronization characters is also known to be generated by this rotating disk. The synchronization openings or slots are arranged on the scanning disc in a circle and leave the Around the disc, the light beam falls on the special synchronizing photocell. As a result, the line change synchronization in the photocell arrangement serving impulses generated. To synchronize the picture change wiTd: for everyone Picture change or, in the case of interlacing, only one change for each line change Impulse needed. To generate these pulses, the scanning disc is therefore given a special slot.

Es sind Abtastscheiben mit mehreren Lochreihen bekannt, bei deren Verwendung zur vollständigen Abtastung eines jeden Bildes mehrere Umdrehungen der Scheibe erforderlich sind. In diesem Falle würden durch den Schlitz für den Bildwechsel bzw. für den Zeilenzugwechsel je vollständiges Bild mehr Impulse erzeugt werden, als für die Synchronisierung erforderlich sind. Hierfür ist vorgeschlagen worden, die Zahl der so erzeugten Impulse auf die Zahl der gewünschten Impulse durch eine Frequenzteileranordnung herabzusetzen. Eine solche Einrichtung kann jedoch erspart werden, wenn gemäß der Erfindung diese Bildwechsel- bzw. Zeilenzugwechselimpulse nicht auf optischem Wege durch die Scheibenbewegung, sondern elektrisch aus der Klemmenspannung des die Scheibe antreibenden Motors gewonnen werden. Dadurch ist zwischen der Scheibenumdrehung und dem Bildwechselzeichen ein ausreichender Synchronismus gewährleistet. Es ist lediglich erforderlich, aus der Klemmenspannung des Antriebsmotors über eine Einrichtung bekannter Art die sinusförmige Spannung in geeignete Impulse umzuformen, um diese dann zusammen mit den Zeilenimpulsen auf den Sender zu geben. In Fällen, in denen die Frequenz der Motorklemmenspannung das Doppelte der gewünschten Bildwech.selfrequenz ist, ist zur Erzeugung der Bildwechselimpulse eine Halbierung dieser Frequenz erforderlich.There are scanning disks with several rows of holes are known in which Use several revolutions of the to completely scan each image Disc are required. In this case, the image would change through the slot or more impulses are generated for each complete image for the line change, than are required for synchronization. For this it has been suggested the number of pulses generated in this way to the number of desired pulses by a Reduce frequency divider arrangement. Such a facility can however, these image change or line train change pulses are saved according to the invention not optically through the movement of the pane, but electrically from the Terminal voltage of the motor driving the disc can be obtained. This is Sufficient synchronism between the disk rotation and the alternating image sign guaranteed. It is only necessary from the terminal voltage of the drive motor Using a device of a known type, convert the sinusoidal voltage into suitable pulses to reshape them in order to then give them to the transmitter together with the line pulses. In cases where the frequency of the motor terminal voltage is twice the desired Picture change frequency is halved to generate the picture change pulses this frequency is required.

Claims (1)

PATENTANSPRÜCHE: i. Verfahren zur Erzeugung der Zeilen-und Bildwechsel- bzw. Zeilenzugsynchronisierzeichen bei Fernsehsendern, bei dem die Abtastung mittels einer umlaufenden Mehrfachspirallochscheibe erfolgt, dadurch gekennzeichnet, daß die Bildwechsel- bzw. Zeilenzugwechselzeichen aus der Klemmenspannung des Antriebsmotors der Scheibe hergeleitet werden, während die Zeilenwechselz.eichen in bekannter Weise durch Schlitze bzw. Löcher der Abtastscheibe optisch-elektrisch erzeugt werden. ?-Einrichtung zur Durchführung des Verfahrens nach Anspruch i, dadurch gekennzeichnet, daß an die Klemmen des Antriebsmotors ein Umformer angeschlossen ist, welcher die sinusförmige Antriebsspannung in Impulse umformt. 3. Einrichtung nach Anspruch z, gekennzeichnet durch die Anordnung einer Frequenzhalbierungsstufe zwischen den Klemmen des Motors und dem Ausgangskreis für die Impulse. Zur Abgrenzung des Erfindungsgegenstands vom Stand der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden:. Deutsche Patentschrift Nr. 502 058; französische Patentschriften Nr. 699 544, 793766. PATENT CLAIMS: i. Method for generating the line and picture change or line pull synchronization characters in television transmitters, in which the scanning is carried out by means of a rotating multiple spiral perforated disc, characterized in that the picture change or line change characters are derived from the terminal voltage of the drive motor of the disc, while the line change characters can be generated optically-electrically in a known manner through slots or holes in the scanning disc. ? Device for carrying out the method according to claim i, characterized in that a converter is connected to the terminals of the drive motor, which converts the sinusoidal drive voltage into pulses. 3. Device according to claim z, characterized by the arrangement of a frequency halving stage between the terminals of the motor and the output circuit for the pulses. In order to differentiate the subject matter of the invention from the state of the art, the following publications were considered in the granting procedure: German Patent No. 502 058; French patents nos. 699 544, 793766.
DER104698D 1936-11-27 1936-11-27 Method for generating line characters and alternating picture characters in television broadcasters Expired DE755706C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DER104698D DE755706C (en) 1936-11-27 1936-11-27 Method for generating line characters and alternating picture characters in television broadcasters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER104698D DE755706C (en) 1936-11-27 1936-11-27 Method for generating line characters and alternating picture characters in television broadcasters

Publications (1)

Publication Number Publication Date
DE755706C true DE755706C (en) 1954-11-29

Family

ID=7421075

Family Applications (1)

Application Number Title Priority Date Filing Date
DER104698D Expired DE755706C (en) 1936-11-27 1936-11-27 Method for generating line characters and alternating picture characters in television broadcasters

Country Status (1)

Country Link
DE (1) DE755706C (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502058C (en) * 1929-04-06 1930-07-10 Siemens & Halske Akt Ges Method for synchronizing commutator motors
FR699544A (en) * 1931-09-26 1931-02-16 Westinghouse Electric & Mfg Co Remote transmission system of images and other objects
FR793766A (en) * 1934-10-31 1936-01-31 Rca Corp Improvements to television systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502058C (en) * 1929-04-06 1930-07-10 Siemens & Halske Akt Ges Method for synchronizing commutator motors
FR699544A (en) * 1931-09-26 1931-02-16 Westinghouse Electric & Mfg Co Remote transmission system of images and other objects
FR793766A (en) * 1934-10-31 1936-01-31 Rca Corp Improvements to television systems

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