WO1991009497A1 - Circuit for on-screen display of characters in a tv receiver - Google Patents

Circuit for on-screen display of characters in a tv receiver Download PDF

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Publication number
WO1991009497A1
WO1991009497A1 PCT/EP1990/002067 EP9002067W WO9109497A1 WO 1991009497 A1 WO1991009497 A1 WO 1991009497A1 EP 9002067 W EP9002067 W EP 9002067W WO 9109497 A1 WO9109497 A1 WO 9109497A1
Authority
WO
WIPO (PCT)
Prior art keywords
characters
picture tube
rgb
circuit
signals
Prior art date
Application number
PCT/EP1990/002067
Other languages
German (de)
French (fr)
Inventor
David Ronald Gray
John Patrick Macaree
Original Assignee
Deutsche Thomson-Brandt Gmbh
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 Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Publication of WO1991009497A1 publication Critical patent/WO1991009497A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/74—Circuits for processing colour signals for obtaining special effects
    • H04N9/76—Circuits for processing colour signals for obtaining special effects for mixing of colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/641—Multi-purpose receivers, e.g. for auxiliary information

Definitions

  • the invention is based on a circuit for superimposing characters in a television receiver in accordance with the preamble of claim 1.
  • Such a television receiver contains a video signal processing circuit which generates the color difference signals and the luminance signal for driving the picture tube from the television signal received via radio.
  • a microprocessor is provided, which delivers RGB signals at its outputs for the insertion of characters on the picture tube.
  • These characters can e.g. represent a user guidance through a program menu, form a dialog with the operator with regard to the operation of the television receiver, contain information in the sense of a video text signal or convey other information to the operator in addition to the respectively displayed picture.
  • This display is also referred to as OSD (on screen display) or OSP (on screen programming).
  • the RGB signals from the outputs of the microprocessor are preferably an RGB input of the television receiver fed.
  • the RGB signals would then have to be coded or otherwise processed in order to be able to feed them into the video signal processing circuit.
  • this is not always possible without further ado, especially if the video signal processing circuit is designed as a complex integrated circuit.
  • the invention has for its object to provide a simple circuit for controlling the picture tube with the RGB signals at the output of the microprocessor when the television receiver has no RGB input.
  • the video signal processing circuit is thus deliberately bypassed.
  • the RGB signals from the output of the microprocessor are fed in where RGB signals are already formed by the matrixing of the color difference signals and the luminance signal.
  • a transistor stage is preferably connected to the output of the processor, the operating voltage of which is derived from the RGB output stage on the picture tube fed with the output signal of the processor.
  • the processor can e.g. deliver only one of the RGB signals, e.g. only the signal G in order to bring about a character overlay in green color. If the characters are to be displayed in different colors, all three RGB signals are preferably transmitted from the microprocessor to the picture tube in the manner according to the invention.
  • a radio television signal is received with antenna 1 and fed to tuner 2.
  • the tuner 2 feeds, among other things, the video signal processing circuit 3, which supplies the color difference signals (R - Y), (G - Y) and (B - Y) and the luminance signal Y for the control of the picture tube 4.
  • the transistor stage 5 is fed with the signals (R - Y) and Y and supplies the color signal R for the picture tube 4.
  • the transistor stage 6 is fed with the signals (G - Y) and Y and supplies the color signal G for the picture tube ⁇ re 4, while the transistor stage 7 is fed with the signals (B - Y) and Y and supplies the color signal B for the picture tube 4.
  • the circuit described so far serves to control the picture tube 4 for displaying an image received via a television broadcast signal.
  • the television receiver additionally contains the microprocessor 8. This produces, among other things, color signals -R, -G, -B at the outputs 22, 23, 24, which serve to generate additional symbols such as characters, data, information on the screen of the picture tube 4 .
  • the three color signals -R, -G, -B emitted by processor 8 are applied to the bases of three transistors TR, TG and TB. Their collectors are each connected to the emitter of the associated transistor stages 5, 6, 7.
  • the signals R, G, B representing the characters are thus inserted in the transistor stages 5, 6, 7 into the signals coming from the circuit 3 and generate the corresponding characters on the screen of the picture tube 4.
  • the transistor stages TR, TG, TB connected to the microprocessor 8 receive no operating voltage at this point.
  • the DC voltage at the emitters of transistor stages 5, 6, 7 is used as the operating voltage.
  • the character control signals RGB flow from the processor 8 in the direction of the output stages 5, 6, 7, the operating voltage flows in the opposite direction from the transistor stages 5, 6, 7 to the transistor ren TR, TG, TB.
  • all three color signals R, G, B are thus available for the characters. These signals are preferably bivalent, that is, they have either the maximum amplitude or the amplitude 0.
  • RGB With the three signals RGB, a colored representation of the characters, including black and white reproduction, is possible. It is also possible to supply only one of the three color signals RGB from the processor 8 to the picture tube 4 for a monochrome display of the characters. Preferably only the signal G is used to display characters in green. A combination of only two of the three color signals RGB is also possible.
  • the circuit 3 contains e.g. an integrated circuit of the type M51407ASP (PAL).
  • the microprocessor 8 is e.g. of the type ⁇ P47C 634N.

Abstract

In a TV receiver, a microprocessor (8) generates RGB signals for the on-screen display of additional characters. The aim of the invention is to provide a simple control circuit for these signals when the TV receiver has no RGB input. For each colour, a processor output is linked to a cathode of the picture tube (4), bypassing the video-signal processing circuit (3).

Description

Schaltung zur Einblendung von Schriftzeichen in einem Fernsehe p änger Circuit for overlaying characters in a television receiver
Die Erfindung geht aus von einer Schaltung zur Einblendung von Schriftzeichen in einem Fernsehempfänger gemäß dem Ober¬ begriff des Anspruchs 1.The invention is based on a circuit for superimposing characters in a television receiver in accordance with the preamble of claim 1.
Ein derartiger Fernsehempfänger enthält eine Videosignal-Ver¬ arbeitungsschaltung, die aus dem über Rundfunk empfangenen Fernsehsignal die FarbdifferenzSignale und das Leuchtdichte¬ signal für die Ansteuerung der Bildröhre erzeugt. Zusätzlich ist ein Mikroprozessor vorgesehen, der an seinen Ausgängen RGB-Signale für die Einblendung von Schriftzeichen auf der Bildröhre liefert. Diese Schriftzeichen können z.B. eine Be¬ nutzerführung durch ein Programmenü darstellen, mit dem Be¬ dienenden einen Dialog hinsichtlich der Bedienung des Fernsehempfängers bilden, Informationen im Sinne eines Video¬ textsignals beinhalten oder sonstige Hinweise zusätzlich zu dem jeweils dargestellten Bild für den Bedienenden vermit¬ teln. Diese Einblendung wird auch als OSD (on screen dis- play) oder OSP (on screen programming) bezeichnet.Such a television receiver contains a video signal processing circuit which generates the color difference signals and the luminance signal for driving the picture tube from the television signal received via radio. In addition, a microprocessor is provided, which delivers RGB signals at its outputs for the insertion of characters on the picture tube. These characters can e.g. represent a user guidance through a program menu, form a dialog with the operator with regard to the operation of the television receiver, contain information in the sense of a video text signal or convey other information to the operator in addition to the respectively displayed picture. This display is also referred to as OSD (on screen display) or OSP (on screen programming).
Die RGB-Signale von den Ausgängen des Mikroprozessors werden dabei vorzugsweise einem RGB-Eingang des Fernsehempfängers zugeführt. Es gibt indessen Fernsehempfänger vereinfachter Bauart, die einen derartigen RGB-Eingang nicht haben. Die RGB-Signale müßten dann codiert oder sonstwie aufbereitet werden, um sie in die Videosignal-Verarbeitungsschaltung ein¬ speisen zu können. Dieses ist indessen nicht immer ohne wei¬ teres möglich, zumal wenn die Videosignal-Verarbeitungschalt¬ ung als komplexer integrierter Schaltkreis ausgebildet ist.The RGB signals from the outputs of the microprocessor are preferably an RGB input of the television receiver fed. However, there are television receivers of a simplified design that do not have such an RGB input. The RGB signals would then have to be coded or otherwise processed in order to be able to feed them into the video signal processing circuit. However, this is not always possible without further ado, especially if the video signal processing circuit is designed as a complex integrated circuit.
Der Erfindung liegt die Aufgabe zugrunde, eine einfache Schaltung zur Steuerung der Bildröhre mit den RGB-Signalen am Ausgang des Mikroprozessors zu schaffen, wenn der Fernseh¬ empfänger keinen RGB-Eingang aufweist.The invention has for its object to provide a simple circuit for controlling the picture tube with the RGB signals at the output of the microprocessor when the television receiver has no RGB input.
Diese Aufgabe wird durch die im Anspruch 1 angegebene Erfin¬ dung gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the invention specified in claim 1. Advantageous developments of the invention are specified in the subclaims.
Bei der Erfindung wird also die Videosignal-Verarbeitungs- schaltung bewußt umgangen. Die RGB-Signale vom Ausgang des Mikroprozessors werden dort eingespeist, wo durch die Matrix- ierung der FarbdifferenzSignale und des Leuchtdichtesignals bereits RGB-Signale gebildet sind. Vorzugsweise ist jeweils an den Ausgang des Prozessors eine Transistorstufe ange¬ schlossen, deren Betriebsspannung von der mit dem Ausgangssi¬ gnal des Prozessors gespeisten RGB-Endstufe an der Bildröhre abgeleitet ist. Der Prozessor kann z.B. nur eines der RGB- Signale liefern, z.B. nur das Signal G, um damit eine Schriftzeicheneinblendung in grüner Farbe zu bewirken. Wenn die Schriftzeicheneinblendung verschiedenfarbig sein soll, werden vorzugsweise alle drei RGB-Signale in der erfindungs¬ gemäßen Weise von dem Mikroprozessor auf die Bildröhre über¬ tragen.In the invention, the video signal processing circuit is thus deliberately bypassed. The RGB signals from the output of the microprocessor are fed in where RGB signals are already formed by the matrixing of the color difference signals and the luminance signal. A transistor stage is preferably connected to the output of the processor, the operating voltage of which is derived from the RGB output stage on the picture tube fed with the output signal of the processor. The processor can e.g. deliver only one of the RGB signals, e.g. only the signal G in order to bring about a character overlay in green color. If the characters are to be displayed in different colors, all three RGB signals are preferably transmitted from the microprocessor to the picture tube in the manner according to the invention.
Ein Ausführungsbeispiel der Erfindung wird anhand der Zeich¬ nung erläutert. In der Figur wird mit der Antenne 1 ein Rundfunk-Fernsehsi¬ gnal empfangen und dem Tuner 2 zugeführt. Der Tuner 2 speist unter anderem die Videosignal-Verarbeitungschaltung 3, die die Farbdifferenzsignale (R - Y), (G - Y) und (B - Y) sowie das Leuchtdichtesignal Y für die Steuerung der Bildröhre 4 liefert. Die Transistorstufe 5 wird mit den Signalen (R - Y) und Y gespeist und liefert das Farbsignal R für die Bildröh¬ re 4. Die Transistorstufe 6 wird mit den Signalen (G - Y) und Y gespeist und liefert das Farbsignal G für die Bildröh¬ re 4, während die Transistorstufe 7 mit den Signalen (B - Y) und Y gespeist wird und das Farbsignal B für die Bildröhre 4 liefert. Die soweit beschriebene Schaltung dient zur Steue¬ rung der Bildröhre 4 für die Darstellung eines über ein Fernseh-Rundfunk-Signal empfangenen Bildes.An embodiment of the invention is explained with reference to the drawing. In the figure, a radio television signal is received with antenna 1 and fed to tuner 2. The tuner 2 feeds, among other things, the video signal processing circuit 3, which supplies the color difference signals (R - Y), (G - Y) and (B - Y) and the luminance signal Y for the control of the picture tube 4. The transistor stage 5 is fed with the signals (R - Y) and Y and supplies the color signal R for the picture tube 4. The transistor stage 6 is fed with the signals (G - Y) and Y and supplies the color signal G for the picture tube ¬ re 4, while the transistor stage 7 is fed with the signals (B - Y) and Y and supplies the color signal B for the picture tube 4. The circuit described so far serves to control the picture tube 4 for displaying an image received via a television broadcast signal.
Der Fernsehempfänger enthält zusätzlich den Mikroprozessor 8. Dieser erzeugt unter anderem an den Ausgängen 22, 23, 24 Farbsignale -R, -G, -B, die zur Erzeugung zusätzlicher Symbo¬ le wie Schriftzeichen, Daten, Hinweise auf dem Bildschirm der Bildröhre 4 dienen. Die drei vom Prozessor 8 abgegebenen Farbsignale -R, -G, -B sind an die Basen von drei Transisto¬ ren TR, TG und TB angelegt. Deren Kollektoren sind jeweils mit dem Emitter der zugehörigen Transistorstufen 5, 6, 7 ver¬ bunden. Die die Schriftzeichen darstellenden Signale R, G, B werden somit in den Tranistorstufen 5, 6, 7 in die von der Schaltung 3 kommenden Signale eingefügt und erzeugen auf dem Bildschirm der Bildröhre 4 die entsprechenden Schriftzei¬ chen. Die an den Mikroprozessor 8 angeschlossenen Transistor¬ stufen TR, TG, TB erhalten an dieser Stelle keine Betriebs¬ spannung. Als Betriebsspannung wird jeweils die an den Emit¬ tern der Transistorstufen 5, 6, 7 stehende Gleichspannung ausgenutzt. Während also die Schriftzeichen-Steuersignale RGB von dem Prozessor 8 in Richtung der Endstufen 5, 6, 7 fließen, fließt die Betriebsspannung in entgegengesetzter Richtung von den Transistorstufen 5, 6, 7 zu den Transisto- ren TR, TG, TB. Im dargestellten Beispiel sind somit für die Schriftzeichen alle drei Farbsignale R, G, B vorhanden. Vor¬ zugsweise sind diese Signale bivalent, haben also entweder die Maximalamplitude oder die Amplitude 0. Mit den drei Si¬ gnalen RGB ist eine farbige Darstellung der Schriftzeichen einschließlich einer Schwarz-Weiß-Wiedergabe möglich. Es ist auch möglich, für eine monochrome Darstellung der Schriftzei¬ chen nur eines der drei Farbsignale RGB vom Prozessor 8 der Bildröhre 4 zuzuführen. Vorzugsweise wird nur das Signal G zur Darstellung von Schriftzeichen in grün verwendet. Ebenso ist auch eine Kombination von nur zwei der drei Farbsignale RGB möglich.The television receiver additionally contains the microprocessor 8. This produces, among other things, color signals -R, -G, -B at the outputs 22, 23, 24, which serve to generate additional symbols such as characters, data, information on the screen of the picture tube 4 . The three color signals -R, -G, -B emitted by processor 8 are applied to the bases of three transistors TR, TG and TB. Their collectors are each connected to the emitter of the associated transistor stages 5, 6, 7. The signals R, G, B representing the characters are thus inserted in the transistor stages 5, 6, 7 into the signals coming from the circuit 3 and generate the corresponding characters on the screen of the picture tube 4. The transistor stages TR, TG, TB connected to the microprocessor 8 receive no operating voltage at this point. The DC voltage at the emitters of transistor stages 5, 6, 7 is used as the operating voltage. Thus, while the character control signals RGB flow from the processor 8 in the direction of the output stages 5, 6, 7, the operating voltage flows in the opposite direction from the transistor stages 5, 6, 7 to the transistor ren TR, TG, TB. In the example shown, all three color signals R, G, B are thus available for the characters. These signals are preferably bivalent, that is, they have either the maximum amplitude or the amplitude 0. With the three signals RGB, a colored representation of the characters, including black and white reproduction, is possible. It is also possible to supply only one of the three color signals RGB from the processor 8 to the picture tube 4 for a monochrome display of the characters. Preferably only the signal G is used to display characters in green. A combination of only two of the three color signals RGB is also possible.
Die Schaltung 3 enthält z.B. einen integrierten Schaltkreis vom Typ M51407ASP (PAL). Der Mikroprozessor 8 ist z.B. vom Typ μP47C 634N. The circuit 3 contains e.g. an integrated circuit of the type M51407ASP (PAL). The microprocessor 8 is e.g. of the type μP47C 634N.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Schaltung zur Einblendung von Schriftzeichen in einem Fernsehempfänger mit einer Videosignal-Verarbeitungs¬ schaltung (3), einer Bildröhre (4) und einem Mikropro¬ zessor (8), der an Ausgängen die Schriftzeichen darstel¬ lende RGB-Signale liefert, dadurch gekennzeichnet, daß jeweils ein Ausgang (22, 23, 24) des Prozessors (8) un¬ ter Umgehung der Videosignal-Verarbeitungsschaltung (3) mit einer Kathode der Bildröhre (4) verbunden ist.1. Circuit for superimposing characters in a television receiver with a video signal processing circuit (3), a picture tube (4) and a microprocessor (8) which delivers the characters representing RGB characters at outputs, characterized in that that an output (22, 23, 24) of the processor (8) is connected to a cathode of the picture tube (4), bypassing the video signal processing circuit (3).
2. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß jeweils an einen Ausgang (22, 23, 24) des Prozessors2. Circuit according to claim 1, characterized in that in each case to an output (22, 23, 24) of the processor
(8) die Basis eines Transistors (TR, TG, TB) angeschlos¬ sen ist, dessen Kollektor mit der zugehörigen Kathode der Bildröhre (4) verbunden ist.(8) the base of a transistor (TR, TG, TB) is connected, the collector of which is connected to the associated cathode of the picture tube (4).
3. Schaltung nach Anspruch 2, dadurch gekennzeichnet, daß der Kollektor mit der Steuerelektrode einer die jewei- lge Kathode der Bildröhre (4) ansteuernden RGB-Transi- stor-Endstufe (5, 6, 7) verbunden ist.3. A circuit according to claim 2, characterized in that the collector is connected to the control electrode of an RGB transistor output stage (5, 6, 7) which drives the respective cathode of the picture tube (4).
4. Schaltung nach Anspruch 3, dadurch gekennzeichnet, daß der Kollektor an den Emitter eines Transistors der RGB- Endstufe (5, 6, 7) angeschlossen ist, dessen Basis ein Farbdifferenzsignal (R - Y, G - Y, B - Y) und dessen Emitter das Leuchtdichtesignal (Y) zugeführt ist.4. A circuit according to claim 3, characterized in that the collector is connected to the emitter of a transistor of the RGB output stage (5, 6, 7), the base of which is a color difference signal (R - Y, G - Y, B - Y) and the emitter of which the luminance signal (Y) is supplied.
5. Schaltung nach Anpruch 3 oder 4, dadurch gekennzeich¬ net, daß eine an der Endstufe (5, 6, 7) stehende Gleich¬ spannung zusätzlich als Betriebsspannung für den Transi¬ stor (TR, TG, TB) an dem Ausgang des Prozessors (8) aus¬ genutzt ist. 5. Circuit according to claim 3 or 4, characterized gekennzeich¬ net that a standing at the output stage (5, 6, 7) DC voltage additionally as an operating voltage for the transistor (TR, TG, TB) at the output of the processor (8) is used.
PCT/EP1990/002067 1989-12-09 1990-12-01 Circuit for on-screen display of characters in a tv receiver WO1991009497A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3940812.4 1989-12-09
DE19893940812 DE3940812A1 (en) 1989-12-09 1989-12-09 CIRCUIT FOR DISPLAYING LETTERS IN A TELEVISION RECEIVER

Publications (1)

Publication Number Publication Date
WO1991009497A1 true WO1991009497A1 (en) 1991-06-27

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PCT/EP1990/002067 WO1991009497A1 (en) 1989-12-09 1990-12-01 Circuit for on-screen display of characters in a tv receiver

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EP (1) EP0504193A1 (en)
CN (1) CN1053343A (en)
AU (1) AU6888491A (en)
DE (1) DE3940812A1 (en)
WO (1) WO1991009497A1 (en)

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DE19508623A1 (en) * 1995-03-10 1996-09-12 Sel Alcatel Ag Circuit arrangement for displaying and controlling ambient lighting conditions

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FR2702621B1 (en) * 1993-03-12 1995-04-28 Thomson Consumer Electronics Method for coding the colors of characters of video systems and device implementing this method.
DE4326898A1 (en) * 1993-08-11 1995-02-16 Thomson Brandt Gmbh Method for evaluating recorded image signals (picture signals, video signals) for an image sharpness display
KR0138309B1 (en) * 1994-12-20 1998-05-15 김광호 Super impose circuit

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DE19508623A1 (en) * 1995-03-10 1996-09-12 Sel Alcatel Ag Circuit arrangement for displaying and controlling ambient lighting conditions
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Also Published As

Publication number Publication date
AU6888491A (en) 1991-07-18
CN1053343A (en) 1991-07-24
DE3940812A1 (en) 1991-06-13
EP0504193A1 (en) 1992-09-23

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