WO1991003134A1 - Pulse generator for a grid pattern in a tv set - Google Patents

Pulse generator for a grid pattern in a tv set Download PDF

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Publication number
WO1991003134A1
WO1991003134A1 PCT/EP1990/001335 EP9001335W WO9103134A1 WO 1991003134 A1 WO1991003134 A1 WO 1991003134A1 EP 9001335 W EP9001335 W EP 9001335W WO 9103134 A1 WO9103134 A1 WO 9103134A1
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WO
WIPO (PCT)
Prior art keywords
pulse
amplitude
stripes
horizontal
grid pattern
Prior art date
Application number
PCT/EP1990/001335
Other languages
German (de)
French (fr)
Inventor
Günter Gleim
Jacques Chauvin
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 WO1991003134A1 publication Critical patent/WO1991003134A1/en

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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
    • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
    • H04N17/045—Self-contained testing apparatus

Definitions

  • the invention is based on a pulse generator for a grid pattern in a television set according to the preamble of claim 1.
  • Such grid patterns are generally used to assess and correct aberrations in the raster written on the image surface, e.g. for correcting north / south, east / west distortions, nonlinearities in the deflection or for correcting the convergence of the three beams R, G, B on the projection surface of a television projection device.
  • three picture tubes are provided for the three primary colors R, G, B, each of which generates a monochromatic image for the three primary colors. These three images on the screens of the three tubes are placed on a projection surface in the form of a screen or a screen and projected there to cover. Since the three superimposed images for R, G, B originate from three spatially separate picture tubes, each with a deflection unit, special measures are required to maintain the convergence on the projection surface. For checking and setting the convergence, it is known to control the three picture tubes with pulses which generate a grid pattern in the picture on the projection surface. This consists of horizontal bright stripes in the row direction and vertical bright stripes in the vertical ⁇ direction, ie perpendicular to the line direction.
  • the pulse sequence for the horizontal stripes thus contains pulses of approximately the length of a line and with an amplitude that corresponds to the desired brightness value, for example tip white or 80-90% of tip white.
  • the pulse train for the vertical stripes consists of individual short pulses over a line duration. Since the horizontal and vertical stripes should have the same brightness, the two pulse trains have the same amplitude.
  • the invention has for its object to eliminate the difference in brightness between the horizontal and vertical strips without significant change in the circuit and to ensure the same visual impression of brightness for both strips.
  • the invention is based on the following findings and considerations.
  • the pulse trains for the control of the picture tubes run over those provided for the control of the picture tubes Video amplifier.
  • These video amplifiers have a frequency response due to unavoidable capacitances, namely a low-pass characteristic with a drop towards high frequencies. This means that pulse jumps are not transmitted correctly due to their share of high frequencies, but are flattened.
  • This frequency response has practically no effect on the first pulse sequence for the horizontal stripes, because the pulse extends over the entire line run-up time and the pulse jump lies outside the visible image.
  • the pulses of the second pulse sequence for the vertical stripes lie entirely in the visible image area. These pulses are therefore deformed by the frequency response of the video amplifier in such a way that they give the lower impression of brightness.
  • This disadvantage can be compensated for by consciously increasing the amplitude of these pulses relative to the pulses of the first pulse sequence.
  • This solution has the advantage that practically no change in the circuit is necessary.
  • the pulse generator is only to be set such that the pulses of the second pulse train have a higher amplitude.
  • the disadvantage inherently occurring in the frequency plane and therefore in the curve shape is advantageously compensated for by a measure in the amplitude plane.
  • the invention can be used particularly advantageously. For the convergence correction at increased line requirements of 32 kHz for HDTV pro ection, because in such systems the pulses of the second pulse sequence only have a duration of about 50 ns.
  • the invention is fundamentally applicable to television sets with control and correction of parameters of the grid-like deflection, for example of south / north, east / west distortions, nonlinearities in the deflection and other geometrical distortions, both for normal television receivers with one Picture tube as well as for pro ection devices with three picture tubes. In all such cases, the assessment and correction are preferably carried out using such a grid pattern.
  • FIG. 2 the shape of the generated pulses of the first and second pulse series
  • FIG. 3 a block diagram for the control of a picture tube for generating the grid pattern according to FIG. 1.
  • FIG. 1 shows the projection surface 1 of a television projection system onto which the image from three picture tubes is projected.
  • the picture tubes are controlled in such a way that a grid pattern with horizontal bright stripes SH and vertical bright stripes SV is generated on surface 1 for convergence control and convergence correction.
  • the width a of the strips SH is only one line and is approximately equal to the width b of the vertical strips SV.
  • the vertical stripes SV are separated by the two te pulse train V formed. This consists of several short pulses during the forward line of a line.
  • the grid pattern must be very fine for the best possible setting for the convergence.
  • the pulses for the vertical stripes SV are therefore only very short pulses which produce corresponding stripes with the width of approximately one line. It is initially assumed that the first pulse 3 of the pulse train V also has the amplitude AH. However, this pulse is converted into the dashed pulse 3 'by the frequency response of the video amplifier. It can be seen that the pulse 3 'has a reduced amplitude and therefore causes an annoying reduced brightness impression of the vertical stripes SV.
  • the pulse 4 is therefore generated with an increased amplitude.
  • the pulse 4 experiences the same deformation due to the frequency response of the video amplifier, so that the likewise deformed pulse 4 'is created. Due to its increased amplitude, the pulse 4 'produces the same impression of brightness for the stripes SV as the pulse H for the horizontal stripes SH.
  • the pulse deformation from 3 to 3 1 and from 4 to 4 'is thus compensated by the increase in amplitude from 3 to 4, as far as the impression of brightness of the strips SH, SV shown is concerned.
  • Fig. 3 shows a block diagram.
  • the circuit 5 is used to generate the pulse sequences H and V for the grating pattern according to FIG. 1.
  • the signal generated in the circuit 5 is sent to the picture tube 7 via the video amplifier 6, which is also used for the signal representing the image fed.
  • the frequency response of the video amplifier 6 causing the pulse deformation according to FIG. 2 is indicated by the RC element 8.
  • the circuit 5 contains a pulse generator 9 which generates digital signals HD and VD. These signals are divided into two D / A Converters 10, 11 are converted into corresponding analog signals, namely the pulse trains H Lind V. These are added in the adding stage 12 and fed to the video amplifier 6.
  • the video amplifier 5 generates the pulse train H with the non-disturbing transient process 2 and the deformed pulses 4 'with the increased amplitude according to FIG. 2.
  • the measure of the increase in amplitude from AH to AV, ie from pulse 3 to pulse 4, is determined empirically in such a way that the viewer perceives the strips SH and SV with the same impression of brightness. It has been shown that in practice an increase in amplitude of approximately 20-30% produces the same impression of brightness of the horizontal and vertical strips.
  • the measure of the increase in amplitude depends on the respective pulse width and the frequency response of the video amplifier.
  • the increase in amplitude can in principle take place in the digital range, that is to say within the generator 9, but also in the analog range, that is to say at the output of the D / A converter 11.
  • the invention has been described for horizontal and vertical strips. It can also be used for strips with other directions, i.e. for horizontal and diagonal strips. In the case of diagonal strips, the pulses 3 and 4 of the pulse train V are slightly offset from line to line.
  • the width a of the horizontal stripes SH can also correspond to several lines, preferably a and b in FIG. 1 being the same.

Abstract

In a grid constructed from bright, horizontal and vertical stripes (SH, SV), the vertical stripes (SV) are less bright than the horizontal stripes (SH). The aim of the invention is to eliminate this difference in brightness without appreciably altering the circuit. To this end, the amplitude (AH) of the pulse sequence (V) for the vertical stripes (SV) is increased in relation to the amplitude (AH) of the pulse sequence (H) for the horizontal stripes (SH). Application, in particular, to projection TV sets with large projection surfaces.

Description

Impulsgenerator für ein G ttermuster in einem FernsehgerätPulse generator for a god pattern in a television set
Die Erfindung geht aus von einem Impulsgenerator für ein Git¬ termuster in einem Fernsehgerät gemäß dem Oberbegriff des Anspruchs 1.The invention is based on a pulse generator for a grid pattern in a television set according to the preamble of claim 1.
Derartiger Gittermuster dienen allgemein zur Beurteilung und Korrektur von Abbildungsfehlern in dem auf der Bildfläche geschriebenen Raster, z.B. für Korrektur von Nord/Süd-, Ost/West-Verzeichnungen, Nichtlineari äten in der Ablenkung oder zur Korrektur der Konvergenz der drei Strahlen R, G, B auf der Projektionsfläche eines Fernseh-Projektionsgerätes.Such grid patterns are generally used to assess and correct aberrations in the raster written on the image surface, e.g. for correcting north / south, east / west distortions, nonlinearities in the deflection or for correcting the convergence of the three beams R, G, B on the projection surface of a television projection device.
Bei Geräten oder Anlagen zur Fernsehprojektion sind drei Bildröhren für die drei Grundfarben R, G, B vorgesehen, die je ein monochromatisches Bild für die drei Grundfarben erzeu¬ gen. Diese drei Bilder auf den Bildschirmen der drei Röhren werden auf eine Projektionsfläche in Form einer Leinwand oder einer Mattscheibe projiziert und dort zur Deckung ge¬ bracht. Da die drei überlagerten Bilder für R, G, B von drei räumlich getrennten Bildröhren mit je einer Ablenkeinheit stammen, sind besonders Maßnahmen zur Einhaltung der Konver¬ genz auf der Projektionsfläche erforderlich. Für die Kontrolle und Einstellung der Konvergenz ist es be¬ kannt, die drei Bildröhren mit Impulsen anzusteuern, die in dem Bild auf der Projektionsfläche ein Gittermuster erzeu¬ gen. Dieses besteht aus waagerechten hellen Streifen in Zei¬ lenrichtung und aus senkrechten hellen Streifen in Vertikal¬ richtung, also senkrecht zur Zeilenrichtung. Die Impulsfolge für die waagerechten Streifen enthalten somit Impulse etwa von der Dauer einer Zeile und mit einer Amplitude, die dem gewünschten Helligkeitswert, also z.B. Spitzenweiß oder 80 - 90 % von Spitzenweiß entspricht. Die Impulsfolge für die senkrechten Streifen bestehen aus einzelnen kurzen Impul¬ sen während einer Zeilendauer. Da die waagerechten und die senkrechten Streifen gleiche Helligkeit haben sollen, haben die beiden Impulsfolgen gleiche Amplitude.In devices or systems for television projection, three picture tubes are provided for the three primary colors R, G, B, each of which generates a monochromatic image for the three primary colors. These three images on the screens of the three tubes are placed on a projection surface in the form of a screen or a screen and projected there to cover. Since the three superimposed images for R, G, B originate from three spatially separate picture tubes, each with a deflection unit, special measures are required to maintain the convergence on the projection surface. For checking and setting the convergence, it is known to control the three picture tubes with pulses which generate a grid pattern in the picture on the projection surface. This consists of horizontal bright stripes in the row direction and vertical bright stripes in the vertical ¬ direction, ie perpendicular to the line direction. The pulse sequence for the horizontal stripes thus contains pulses of approximately the length of a line and with an amplitude that corresponds to the desired brightness value, for example tip white or 80-90% of tip white. The pulse train for the vertical stripes consists of individual short pulses over a line duration. Since the horizontal and vertical stripes should have the same brightness, the two pulse trains have the same amplitude.
Es hat sich gezeigt, daß die senkrechten Streifen trotz glei¬ cher Amplitude der beiden Impulsfolgen einen geringeren Hel¬ ligkeitseindruck vermitteln als die waagerechten Streifen. Das ist für die Kontrolle und Korrektur der Konvergenz nach¬ teilig, weil diese an den waagerechten und senkrechten Strei¬ fen bei möglichst gleicher Helligkeit erfolgen sollte.It has been shown that, despite the same amplitude of the two pulse sequences, the vertical stripes give a lower impression of brightness than the horizontal stripes. This is disadvantageous for the control and correction of the convergence, because this should take place on the horizontal and vertical strips with the same brightness as possible.
Der Erfindung liegt die Aufgabe zugrunde, ohne nennenswerte Änderung der Schaltung den Helligkeitsunterschied zwischen den waagerechten und senkrechten Streifen zu beseitigen und gleichen visuellen Helligkeitseindruck für beide Streifen zu gewährleisten.The invention has for its object to eliminate the difference in brightness between the horizontal and vertical strips without significant change in the circuit and to ensure the same visual impression of brightness for both strips.
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.
Die Erfindung beruht auf folgenden Erkenntnissen und Überle¬ gungen. Die Impulsfolgen für die Steuerung der Bildröhren laufen über die zur Ansteuerung der Bildröhren vorgesehenen Videoverstärker. Diese Videoverstärker haben einen Frequenz- gang durch unvermeidbare Kapazitäten, und zwar eine Tiefpa߬ charakteristik mit einem Abfall zu hohen Frequenzen hin. Das bedeutet, daß Impulssprünge aufgrund ihrer Anteile an hohen Frequenzen nicht korrekt übertragen, sondern abgeflacht werden. Bei der ersten Impulsfolge für die waagerechten Streifen wirkt sich dieser Frequenzgang praktisch nicht aus, weil der Impuls sich jeweils über die ganze Zeilenhinlauf- zeit erstreckt und der Impulssprung jeweils außerhalb des sichtbaren Bildes liegt. Die Impulse der zweiten Impulsfolge für die senkrechten Streifen jedoch liegen vollständig im sichtbaren Bildbereich. Diese Impulse werden daher durch den Frequenzgang der Videoverstärker derart verformt, das sie den geringeren Helligkeitseindruck vermitteln. Durch bewußte Amplitudenerhöhung dieser Impulse relativ zu den Impulsen der ersten Impulsfolge kann dieser Nachteil ausgeglichen werden. Diese Lösung hat den Vorteil, daß praktisch keine Änderung der Schaltung notwendig ist. Der Impulsgenerator ist lediglich derart einzustellen, daß die Impulse der zwei¬ ten Impulsfolge eine höhere Amplitude aufweisen. Bei der Er¬ findung wird also der an sich in der Frequenzebene und da¬ durch in der Kurvenform auftretende Nachteil durch eine Ma߬ nahme in der Amplitudenebene in vorteilhafter Weise ausgegli¬ chen.The invention is based on the following findings and considerations. The pulse trains for the control of the picture tubes run over those provided for the control of the picture tubes Video amplifier. These video amplifiers have a frequency response due to unavoidable capacitances, namely a low-pass characteristic with a drop towards high frequencies. This means that pulse jumps are not transmitted correctly due to their share of high frequencies, but are flattened. This frequency response has practically no effect on the first pulse sequence for the horizontal stripes, because the pulse extends over the entire line run-up time and the pulse jump lies outside the visible image. However, the pulses of the second pulse sequence for the vertical stripes lie entirely in the visible image area. These pulses are therefore deformed by the frequency response of the video amplifier in such a way that they give the lower impression of brightness. This disadvantage can be compensated for by consciously increasing the amplitude of these pulses relative to the pulses of the first pulse sequence. This solution has the advantage that practically no change in the circuit is necessary. The pulse generator is only to be set such that the pulses of the second pulse train have a higher amplitude. In the case of the invention, the disadvantage inherently occurring in the frequency plane and therefore in the curve shape is advantageously compensated for by a measure in the amplitude plane.
Die Erfindung ist besonders vorteilhaft anwendbar. Für die Konvergenzkorrektur bei erhöhten Zeilen requenzen von 32 kHz für HDTV-Pro ektion, weil bei derartigen Systemen die Impul¬ se der zweiten Impulsfolge nur noch eine Dauer von etwa 50 ns aufweisen. Die Erfindung ist grundsätzlich anwendbar bei Fernsehgeräten mit Kontrolle und Korrektur von Parametern der rasterweisen Ablenkung, z.B. von Süd/Nord-, Ost/West-Ver¬ zeichnungen Nichtlineari äten in der Ablenkung und sonstigen Geometrieverzerrungen, und zwar sowohl für normale Fernseh¬ empfänger mit einer Bildröhre als auch für Pro ektionsgeräte mit drei Bildröhren. In allen derartigen Fällen erfolgt die Beurteilung und die Korrektur vorzugsweise mit einem derarti¬ gen Gittermuster.The invention can be used particularly advantageously. For the convergence correction at increased line requirements of 32 kHz for HDTV pro ection, because in such systems the pulses of the second pulse sequence only have a duration of about 50 ns. The invention is fundamentally applicable to television sets with control and correction of parameters of the grid-like deflection, for example of south / north, east / west distortions, nonlinearities in the deflection and other geometrical distortions, both for normal television receivers with one Picture tube as well as for pro ection devices with three picture tubes. In all such cases, the assessment and correction are preferably carried out using such a grid pattern.
Die Erfindung wird anhand der Zeichnung am Beispiel der Kon¬ vergenzkorrektur für ein Projektions-Fernsehgerät erläutert. Darin zeigen Fig. 1 im Prinzip das Gittermuster auf derThe invention is explained with reference to the drawing using the example of the convergence correction for a projection television set. 1 shows the lattice pattern on the
Projektionsfläche, Fig. 2 die Form der erzeugten Impulse der ersten und zweiten Impulsfolge und Fig. 3 ein Blockschaltbild für die Steuerung jeweils einer Bildröhre zur Erzeugung des Gittermusters gemäß Fig. 1.2, the shape of the generated pulses of the first and second pulse series, and FIG. 3 a block diagram for the control of a picture tube for generating the grid pattern according to FIG. 1.
Fig. 1 zeigt die Projektionsfläche 1 einer Fernsehprojekti- onsanlage, auf die das Bild von drei Bildröhren projiziert wird. Die Bildröhren werden so gesteuert, daß für die Konver¬ genzkontrolle und Konvergenzkorrektur auf der Fläche 1 ein Gittermuster mit waagerechten hellen Streifen SH und senk¬ rechten hellen Streifen SV erzeugt wird. Die Breite a der Streifen SH beträgt dabei nur eine Zeile und ist etwa gleich der Breite b der senkrechten Streifen SV.1 shows the projection surface 1 of a television projection system onto which the image from three picture tubes is projected. The picture tubes are controlled in such a way that a grid pattern with horizontal bright stripes SH and vertical bright stripes SV is generated on surface 1 for convergence control and convergence correction. The width a of the strips SH is only one line and is approximately equal to the width b of the vertical strips SV.
Fig. 2 zeigt das Steuersignal für die Bildröhren für eine Zeile zwischen zwei Zeilensynchronimpulsen Z. Die waagerech¬ ten Streifen SH werden durch eine erste Impulsfolge H er¬ zeugt, deren Impulse sich jeweils über die ganze Hinlaufzeit einer Zeile erstrecken und die Amplitude AH haben. Die Ampli¬ tude AH stellt den Weißwert oder einen jeweils gewünschten Grauwert dar. Der gestrichelt dargestellte Einschwingvorgang 2 aufgrund des Frequenzgangs des Videoverstärkers hat dabei auf die Helligkeit der dargestellten waagerechten Streifen SH keinen Einfluß, weil er außerhalb des sichtbaren Bildfel¬ des liegt. Die senkrechten Streifen SV werden durch die zwei- te Impulsfolge V gebildet. Diese besteht aus mehreren kurzen Impulsen während der Hinlaufzeile einer Zeile. Für eine mög¬ lichst gute Einstellmöglichkeit für die Konvergenz muß das Gittermuster sehr fein sein. Die Impulse für die senkrechten Streifen SV sind daher nur sehr kurze Impulse, die entspre¬ chende Streifen mit der Breite von etwa einer Zeile erzeu¬ gen. Es ist zunächst angenommen, daß der erste Impuls 3 der Impulsfolge V auch die Amplitude AH hat. Durch den Frequenz¬ gang der Videoverstärker wird jedoch dieser Impuls in den gestrichelten Impuls 3' umgewandelt. Es ist ersichtlich, daß der Impuls 3' eine verringerte Amplitude hat und daher einen störenden verringerten Helligkeitseindruck der senkrechten Streifen SV bewirkt.2 shows the control signal for the picture tubes for a line between two line synchronizing pulses Z. The horizontal stripes SH are generated by a first pulse sequence H, the pulses of which each extend over the entire running time of a line and have the amplitude AH. The amplitude AH represents the white value or a respectively desired gray value. The transient response 2 shown in dashed lines due to the frequency response of the video amplifier has no influence on the brightness of the horizontal stripes SH shown because it lies outside the visible image field. The vertical stripes SV are separated by the two te pulse train V formed. This consists of several short pulses during the forward line of a line. The grid pattern must be very fine for the best possible setting for the convergence. The pulses for the vertical stripes SV are therefore only very short pulses which produce corresponding stripes with the width of approximately one line. It is initially assumed that the first pulse 3 of the pulse train V also has the amplitude AH. However, this pulse is converted into the dashed pulse 3 'by the frequency response of the video amplifier. It can be seen that the pulse 3 'has a reduced amplitude and therefore causes an annoying reduced brightness impression of the vertical stripes SV.
Deshalb wird für die zweite Impulsfolge V der Impuls 4 mit einer erhöhten Amplitude erzeugt. Der Impuls 4 erfährt zwar die gleiche Verformung durch den Frequenzgang des Videover¬ stärkers, so daß dadurch der ebenfalls verformte Impuls 4' entsteht. Der Impuls 4' bewirkt aber durch seine erhöhte Am¬ plitude den gleichen Helligkeitseindruck für die Streifen SV wie der Impuls H für die waagerechten Streifen SH. Die Im- pulsverformung von 3 nach 31 und von 4 nach 4' wird also, was den Helligkeitseindruck der dargestellten Streifen SH, SV betrifft, durch die Amplitudenerhöhung von 3 nach 4 ausge¬ glichen.For the second pulse sequence V, the pulse 4 is therefore generated with an increased amplitude. The pulse 4 experiences the same deformation due to the frequency response of the video amplifier, so that the likewise deformed pulse 4 'is created. Due to its increased amplitude, the pulse 4 'produces the same impression of brightness for the stripes SV as the pulse H for the horizontal stripes SH. The pulse deformation from 3 to 3 1 and from 4 to 4 'is thus compensated by the increase in amplitude from 3 to 4, as far as the impression of brightness of the strips SH, SV shown is concerned.
Fig. 3 zeigt ein Blockschaltbild. Die Schaltung 5 dient zur Erzeugung der Impulsfolgen H und V für das Gittermuster ge¬ mäß Fig. 1. Das in der Schaltung 5 erzeugte Signal wird über den Videoverstärker 6, der auch für das das Bild darstellen¬ de Signal dient, jeweils der Bildröhre 7 zugeführt. Der die Impulsverformung gemäß Fig. 2 bewirkende Frequenzgang des Videoverstärkers 6 ist durch das RC-Glied 8 angedeutet. Die Schaltung 5 enthält einen Impulsgenerator 9 der digitale Si¬ gnale HD und VD erzeugt. Diese Signale werden in zwei D/A- Wandlern 10, 11 in entsprechende analoge Signale, nämlich die Impulsfolgen H Lind V umgewandelt. Diese werden in der Addierstufe 12 addiert und dem Videoverstärker 6 zugeführt. Der Videoverstärker 5 erzeugt die Impulsfolge H mit dem nichtstörenden Einschwingvorgang 2 und die verformten Impul¬ se 4' mit der gemäß Fig. 2 erhöhten Amplitude.Fig. 3 shows a block diagram. The circuit 5 is used to generate the pulse sequences H and V for the grating pattern according to FIG. 1. The signal generated in the circuit 5 is sent to the picture tube 7 via the video amplifier 6, which is also used for the signal representing the image fed. The frequency response of the video amplifier 6 causing the pulse deformation according to FIG. 2 is indicated by the RC element 8. The circuit 5 contains a pulse generator 9 which generates digital signals HD and VD. These signals are divided into two D / A Converters 10, 11 are converted into corresponding analog signals, namely the pulse trains H Lind V. These are added in the adding stage 12 and fed to the video amplifier 6. The video amplifier 5 generates the pulse train H with the non-disturbing transient process 2 and the deformed pulses 4 'with the increased amplitude according to FIG. 2.
Das Maß der Amplitudenerhöhung von AH auf AV, also von dem Impuls 3 auf den Impuls 4 wird empirisch ermittelt, derart, daß der Betrachter die Streifen SH und SV mit gleichem Hel¬ ligkeitseindruck wahrnimmt. Es hat sich gezeigt, daß in der Praxis eine Amplitudenerhöhung um etwa 20 - 30 % einen glei¬ chen Helligkeitseindruck der waagerechten und senkrechten Streifen bewirkt. Das Maß der Amplitudenerhöhung ist abhän¬ gig von der jeweiligen Impulsbreite und dem Frequenzgang des Videoverstärkers. Die Amplitudenerhöhung kann grundsätzlich im digitalen Bereich, also innerhalb des Generators 9 erfol¬ gen, jedoch auch im analogen Bereich, also am Ausgang des D/A-Wandlers 11.The measure of the increase in amplitude from AH to AV, ie from pulse 3 to pulse 4, is determined empirically in such a way that the viewer perceives the strips SH and SV with the same impression of brightness. It has been shown that in practice an increase in amplitude of approximately 20-30% produces the same impression of brightness of the horizontal and vertical strips. The measure of the increase in amplitude depends on the respective pulse width and the frequency response of the video amplifier. The increase in amplitude can in principle take place in the digital range, that is to say within the generator 9, but also in the analog range, that is to say at the output of the D / A converter 11.
Die Erfindung wurde beschrieben für waagerechte und senkrech¬ te Streifen. Sie ist auch anwendbar für Streifen mit anderen Richtungen, also für waagerechte und diagonale Streifen. Bei diagonalen Streifen sind die Impulse 3 bzw. 4 der Impulsfol¬ ge V von Zeile zu Zeile etwas versetzt. Die Breite a der waa¬ gerechten Streifen SH kann auch mehreren Zeilen entsprechen, wobei vorzugsweise jeweils a und b in Fig. 1 gleich sind. The invention has been described for horizontal and vertical strips. It can also be used for strips with other directions, i.e. for horizontal and diagonal strips. In the case of diagonal strips, the pulses 3 and 4 of the pulse train V are slightly offset from line to line. The width a of the horizontal stripes SH can also correspond to several lines, preferably a and b in FIG. 1 being the same.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Impulsgenerator für ein Gittermuster in einem Fernsehge¬ rät zur Erzeugung einer ersten Impulsfolge (H) für waa¬ gerechte helle Streifen (SH) sowie einer zweiten Impuls¬ folge (V) für senkrechte helle Streifen (SV) auf der Bildfläche (1), dadurch gekennzeichnet, daß die Amplitu¬ de (AV) der zweiten Impulsfolge (V) gegenüber der Ampli¬ tude (AH) der ersten Impulsfolge (H) soweit erhöht ist, daß die waagerechten und senkrechten Streifen (SH, SV) gleichen visuellen Helligkeitseindruck vermitteln.1. pulse generator for a grid pattern in a television set for generating a first pulse train (H) for horizontal bright stripes (SH) and a second pulse train (V) for vertical bright stripes (SV) on the picture surface (1) , characterized in that the amplitude (de) of the second pulse train (V) is increased compared to the amplitude (AH) of the first pulse train (H) to such an extent that the horizontal and vertical stripes (SH, SV) have the same visual impression of brightness convey.
2. Generator nach Anspruch 1, dadurch gekennzeichnet, daß die Amplitude (AV) auf etwa das 1,3-fache erhöht wird.2. Generator according to claim 1, characterized in that the amplitude (AV) is increased to about 1.3 times.
3. Generator nach Anspruch 1, dadurch gekennzeichnet, daß das Maß der Amplitudenerhöhung manuell einstellbar ist.3. Generator according to claim 1, characterized in that the degree of amplitude increase is manually adjustable.
4. Generator nach Anspruch 1, dadurch gekennzeichnet, daß er zur Erzeugung einer Impulsfolge für ein Gittermuster für eine Konvergenzkorrektureinrichtung in einem Projek¬ tions-Fernsehgerät dient. 4. Generator according to claim 1, characterized in that it is used to generate a pulse train for a grid pattern for a convergence correction device in a projection TV set.
PCT/EP1990/001335 1989-08-23 1990-08-14 Pulse generator for a grid pattern in a tv set WO1991003134A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3927676.7 1989-08-23
DE19893927676 DE3927676A1 (en) 1989-08-23 1989-08-23 PULSE GENERATOR FOR A GRID PATTERN IN A TELEVISION

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WO1991003134A1 true WO1991003134A1 (en) 1991-03-07

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CN (1) CN1050299A (en)
AU (1) AU6156590A (en)
DD (1) DD297289A5 (en)
DE (1) DE3927676A1 (en)
WO (1) WO1991003134A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7445802B2 (en) 2000-12-26 2008-11-04 Yeda Research And Development Co. Ltd Site-specific in situ generation of allicin using a targeted alliinase delivery system for the treatment of cancers, tumors, infectious diseases and other allicin-sensitive diseases

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2227701A1 (en) * 1973-04-27 1974-11-22 Itt Produits Ind Pattern generator for colour TV - produces multiple test signals for reproduction by receivers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2227701A1 (en) * 1973-04-27 1974-11-22 Itt Produits Ind Pattern generator for colour TV - produces multiple test signals for reproduction by receivers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7445802B2 (en) 2000-12-26 2008-11-04 Yeda Research And Development Co. Ltd Site-specific in situ generation of allicin using a targeted alliinase delivery system for the treatment of cancers, tumors, infectious diseases and other allicin-sensitive diseases

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DE3927676A1 (en) 1991-02-28
DD297289A5 (en) 1992-01-02
CN1050299A (en) 1991-03-27
AU6156590A (en) 1991-04-03

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