WO1999004558A1 - Method and device for vestigial sideband modulation of a television transmitter - Google Patents

Method and device for vestigial sideband modulation of a television transmitter Download PDF

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Publication number
WO1999004558A1
WO1999004558A1 PCT/EP1998/004436 EP9804436W WO9904558A1 WO 1999004558 A1 WO1999004558 A1 WO 1999004558A1 EP 9804436 W EP9804436 W EP 9804436W WO 9904558 A1 WO9904558 A1 WO 9904558A1
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quadrature
carrier
video signal
signal
digital
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PCT/EP1998/004436
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German (de)
French (fr)
Inventor
Walter Bschor
Josef Kirchner
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Rohde & Schwarz Gmbh & Co. Kg
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Publication of WO1999004558A1 publication Critical patent/WO1999004558A1/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C2200/00—Indexing scheme relating to details of modulators or modulation methods covered by H03C
    • H03C2200/0037—Functional aspects of modulators
    • H03C2200/0058—Quadrature arrangements

Definitions

  • the invention relates to a method and an arrangement for residual sideband modulation of the carrier of a television transmitter with a video signal.
  • the object of the invention is to show a method and an arrangement with which the residual sideband modulation of a television transmitter is possible in a simple manner.
  • the residual sideband modulation is carried out directly in the baseband of the video signal, and only a known quadrature modulator is required for this purpose, to which the video signal split by filters into two video signal parts in quadrature is supplied.
  • This division of the video signal into the two signal parts can in principle be carried out by means of analog filters, but it has proven to be particularly advantageous to do this on the digitized video signal and for this purpose two digital filters, preferably so-called FIR (Finite Impulse Response) filters use, by which the digital video signal present in the baseband is divided into two digital video signal parts.
  • FIR Finite Impulse Response
  • Such digital filters have the great advantage that their filter coefficients can be set and changed very simply by programming.
  • a first signal part is generated from the digital video signal in the baseband, which has a real spectrum mirror-symmetrical to the frequency zero (even function), and a second signal part which has a point-symmetrical spectrum to the frequency zero (odd function). If these two spectra generated in this way are then fed to the I and Q inputs of the quadrature modulator, which is fed with the carrier frequency is, these separate spectra overlap in the quadrature modulator in the quadrature modulator to the desired residual sideband spectrum on the carrier frequency.
  • the residual sideband-modulated carrier signal thus arises directly at the output of the quadrature modulator and is then further processed in the television transmitter.
  • the modulation in the intermediate frequency can therefore be dispensed with.
  • the type of modulation can also be changed very easily and quickly to another TV standard, because it is only necessary to reprogram the filter coefficients of the digital filters accordingly.
  • the receiver delay predistortion and also the transmitter predistortion for downstream nonlinear transmitter amplifiers can also be carried out digitally directly in the baseband.
  • FIG. 1 shows the basic circuit diagram of an arrangement according to the invention for residual sideband modulation of a television transmitter with a digital video signal in the baseband.
  • the digital video signal which is either supplied directly as a digital signal from the studio or which is generated in an analog-digital converter 1 from an analog video signal, is fed to the inputs of two digital FIR filters 2 and 3, the outputs 11 and 12 of which Digital-to-analog converters 4 and 5 are connected to I input 13 and Q input 14 of a quadrature modulator 6.
  • the quadrature modulator is of a known construction, as is also used, for example, in the case of higher-quality quadrature amplitude modulation types (QAM).
  • the output frequency of a carrier oscillator 7 is fed directly to a mixer 8 of the I branch (in-phase branch) and to the mixer 9 of the Q branch (quadrature branch) with a 90 ° phase shift.
  • the output signals of the two mixers 8 and 9 are combined in an adder 10 and on Output 11 produces the residual sideband-modulated output signal in the carrier frequency position.
  • the FIR filter 2 is programmed with an impulse response according to FIG. 2, so that it generates a spectrum according to FIG. 3 which is mirror-symmetrical to the frequency zero.
  • the FIR filter 3 is programmed with an impulse response as shown in FIG. 4, so that it generates a spectrum as shown in FIG. 5 which is symmetrical about the frequency zero.
  • the Relationships between impulse response, filter coefficients and thus achievable filter transmission curves (spectra) of such FIR filters are known and are described, for example, in the textbook “Networks, Signals and Systems", Volume II by HW Schuessler, Springer-Verlag Berlin Heidelberg New York Tokyo, p.
  • the digital video signal in the baseband is combined with two frequency-modulated 5.5 MHz carriers which carry the television sound.
  • the analog audio signal 1 / L and the analog audio signal 2 / R are digitized in a known manner by analog-digital converters 20, 21.
  • a pilot tone 24 is added in two adding circuits 22, 23.
  • the frequency-modulated 5.5 MHz carriers are generated by direct digital synthesis (DDS) in modulators 27, 28.
  • DDS direct digital synthesis
  • the two stereo signals processed in this way are combined in an adder 29 to form a 5.5 MHz FM-modulated carrier signal which is added to the output signals of the two FIR filters 2 and 3 with a mutual 90 ° phase shift in each case via adders 30, 31.
  • the residual carrier for the amplitude-modulated video signal is added from a residual carrier generator 34.
  • the receiver predistortion can also be carried out in the baseband via a processor 35 arranged in front of the FIR filters 2 and 3, as can any transmitter predistortion that may be required for downstream non-linear amplifiers of the television transmitter, as indicated by the processor 36 in broken lines.
  • a processor 35 arranged in front of the FIR filters 2 and 3, as can any transmitter predistortion that may be required for downstream non-linear amplifiers of the television transmitter, as indicated by the processor 36 in broken lines.
  • the separately processed signals being known in a known manner (for example according to "Taschenbuch der Hochfrequenztechnik", Meinke / Gundlach, S. P25, Fig. 3) are brought together only in the high frequency position.
  • a second quadrature modulator is provided at the output of the adder 29.

Abstract

The invention relates to a method for vestigial sideband modulation of the carrier of a television transmitter with a video signal. The video signal is divided by means of filters into two signal parts which are in quadrature to each other. These signal parts are supplied to the I or Q entry of a quadrature modulator that is fed with the carrier frequency. The coefficients of the filters are so selected that the spectra of the two signal parts, when reunited in the quadrature modulator, produce the desired residual lateral band spectrum on the carrier frequency.

Description

Verfahren und Anordnung zur Restseitenbandmodulation eines Fernsehsenders Method and arrangement for the residual sideband modulation of a television transmitter
Die Erfindung betrifft ein Verfahren und eine Anordnung zur Restseitenbandmodulation des Trägers eines Fernsehsenders mit einem Videosignal.The invention relates to a method and an arrangement for residual sideband modulation of the carrier of a television transmitter with a video signal.
Die zur Bildübertragung von Videosignalen benutze Restseitenbandmodulation wird bisher stets in der ZF-Ebene durchgeführt (beispielsweise nach Meinke/Gundlach, Taschenbuch der Hochfrequenztechnik, 5. Aufl., Seiten P23-P25). Dazu sind relativ teure und aufwendige Oberflächenfilter (SAW-Filter) erforderlich, die für jeden TV-Standard unterschiedlich aufgebaut werden müssen.The residual sideband modulation used for image transmission of video signals has so far always been carried out on the IF level (for example according to Meinke / Gundlach, Taschenbuch der Hochfrequenztechnik, 5th edition, pages P23-P25). This requires relatively expensive and complex surface filters (SAW filters), which have to be constructed differently for each TV standard.
Es ist Aufgabe der Erfindung, ein Verfahren und eine Anordnung aufzuzeigen, mit der die Restseitenbandmodulation eines Fernsehsenders auf einfache Weise möglich ist.The object of the invention is to show a method and an arrangement with which the residual sideband modulation of a television transmitter is possible in a simple manner.
Diese Aufgabe wird durch ein Verfahren laut Anspruch 1 gelöst. Vorteilhafte Weiterbildungen dieses Verfahrens und einer einfachen Anordnung zum Ausführen dieses Verfahrens ergeben sich aus den Unteransprüchen.This object is achieved by a method according to claim 1. Advantageous further developments of this method and a simple arrangement for carrying out this method result from the subclaims.
Beim erfindungsgemäßen Verfahren wird die Restseitenbandmodulation unmittelbar im Basisband des Videosignals durchgeführt und hierzu ist nur ein bekannter Quadraturmodulator erforderlich, dem das durch Filter in zwei in Quadratur zueinander stehende Videosignalteile aufgespaltene Videosignal zugeführt wird. Diese Aufteilung des Videosignals in die beiden Signalteile kann dabei im Prinzip mittels analoger Filter durchgeführt werden, es hat sich jedoch als besonders vorteilhaft erwiesen, dies am digitalisierten Videosignal duchzuführen und dazu zwei digitale Filter, vorzugsweise sogenannte FIR (Finite Impuls Response)-Filter, zu verwenden, durch die das im Basisband vorliegende digitale Videosignal in zwei digitale Videosignalteile aufgeteilt wird. Es sind dann nur noch Digital/ Analog-Wandler vor dem I- bzw. Q-Eingang des analogen Quadraturmodulators erforderlich. Solche digitalen Filter besitzen den großen Vorteil, daß deren Filterkoeffizienten sehr einfach durch Programmierung eingestellt und verändert werden können. Mit entsprechend programmierten digitalen Filtern wird beispielsweise aus dem digitalen Videosignal im Basisband ein erster Signalteil erzeugt, der ein reelles Spektrum spiegelsymmetrisch zur Frequenz Null (gerade Funktion) besitzt, und ein zweiter Signalteil, der ein zur Frequenz Null punktsymmetrisches Spektrum (ungerade Funktion) besitzt. Wenn diese beiden so erzeugten Spektren dann dem I- und Q- Eingang des Quadraturmodulators zugeführt werden, der mit der Trägerfrequenz gespeist ist, so überlagern sich diese getrennten Spektren bei der 90° phasenversetzten Zusammenführung im Quadraturmodulator zu dem gewünschten Restseitenbandspektrum auf der Trägerfrequenz. Am Ausgang des Quadraturmodulators entsteht also unmittelbar das restseitenbandmodulierte Trägersignal, das dann im Fernsehsender weiter aufbereitet wird. Beim erfindungsgemäßen Verfahren kann also auf die Modulation in der Zwischenfrequenz verzichtet werden. Die Modulationsart kann auch sehr einfach und schnell auf einen anderen TV-Standard umgestellt werden, denn es ist nur erforderlich, die Filterkoeffizienten der digitalen Filter entsprechend neu zu programmieren. Die Empfängerlaufzeit- Vorentzerrung und auch die Sender- Vorverzerrung für nachgeschaltete nichtlineare Senderverstärker kann ebenfalls digital unmittelbar im Basisband durchgeführt werden.In the method according to the invention, the residual sideband modulation is carried out directly in the baseband of the video signal, and only a known quadrature modulator is required for this purpose, to which the video signal split by filters into two video signal parts in quadrature is supplied. This division of the video signal into the two signal parts can in principle be carried out by means of analog filters, but it has proven to be particularly advantageous to do this on the digitized video signal and for this purpose two digital filters, preferably so-called FIR (Finite Impulse Response) filters use, by which the digital video signal present in the baseband is divided into two digital video signal parts. In this case, only digital / analog converters are required before the I or Q input of the analog quadrature modulator. Such digital filters have the great advantage that their filter coefficients can be set and changed very simply by programming. With appropriately programmed digital filters, for example, a first signal part is generated from the digital video signal in the baseband, which has a real spectrum mirror-symmetrical to the frequency zero (even function), and a second signal part which has a point-symmetrical spectrum to the frequency zero (odd function). If these two spectra generated in this way are then fed to the I and Q inputs of the quadrature modulator, which is fed with the carrier frequency is, these separate spectra overlap in the quadrature modulator in the quadrature modulator to the desired residual sideband spectrum on the carrier frequency. The residual sideband-modulated carrier signal thus arises directly at the output of the quadrature modulator and is then further processed in the television transmitter. In the method according to the invention, the modulation in the intermediate frequency can therefore be dispensed with. The type of modulation can also be changed very easily and quickly to another TV standard, because it is only necessary to reprogram the filter coefficients of the digital filters accordingly. The receiver delay predistortion and also the transmitter predistortion for downstream nonlinear transmitter amplifiers can also be carried out digitally directly in the baseband.
Die Erfindung wird im folgenden anhand schematischer Zeichnungen an einem Ausführungsbeispiel näher erläutert.The invention is explained below with reference to schematic drawings of an embodiment.
Fig. 1 zeigt das Prinzipschaltbild einer erfindungsgemäßen Anordnung zur Restseitenbandmodulation eines Fernsehsenders mit einem digitalen Videosignal im Basisband.1 shows the basic circuit diagram of an arrangement according to the invention for residual sideband modulation of a television transmitter with a digital video signal in the baseband.
Das digitale Videosignal, das entweder unmittelbar als Digitalsignal vom Studio zugeführt wird oder das in einem Analog-Digital- Wandler 1 aus einem analogen Videosignal erzeugt wird, wird den Eingängen von zwei digitalen FIR-Filtern 2 und 3 zugeführt, deren Ausgänge 11 und 12 über Digital- Analog-Wandler 4 bzw. 5 mit dem I-Eingang 13 bzw. Q-Eingang 14 eines Quadraturmodulators 6 verbunden sind. Der Quadratur-Modulator ist von bekannter Bauweise, wie er beispielsweise auch bei höherwertigen Quadratur- Amplituden-Modulationsarten (QAM) benutzt wird. Die Ausgangsfrequenz eines Trägeroszillators 7 wird dem einen Mischer 8 des I-Zweiges (Inphasenzweig) unmittelbar und dem Mischer 9 des Q-Zweiges (Quadraturzweig) mit 90° Phasenverschiebung zugeführt Die Ausgangssignale der beiden Mischer 8 und 9 werden in einem Addierer 10 zusammengefaßt und am Ausgang 11 entsteht das restseitenbandmodulierte Ausgangssignal in der Trägerfrequenzlage.The digital video signal, which is either supplied directly as a digital signal from the studio or which is generated in an analog-digital converter 1 from an analog video signal, is fed to the inputs of two digital FIR filters 2 and 3, the outputs 11 and 12 of which Digital-to-analog converters 4 and 5 are connected to I input 13 and Q input 14 of a quadrature modulator 6. The quadrature modulator is of a known construction, as is also used, for example, in the case of higher-quality quadrature amplitude modulation types (QAM). The output frequency of a carrier oscillator 7 is fed directly to a mixer 8 of the I branch (in-phase branch) and to the mixer 9 of the Q branch (quadrature branch) with a 90 ° phase shift. The output signals of the two mixers 8 and 9 are combined in an adder 10 and on Output 11 produces the residual sideband-modulated output signal in the carrier frequency position.
Das FIR-Filter 2 ist mit einer Impulsantwort gemäß Fig. 2 programmiert, so daß es ein spiegelsymmetrisch zur Frequenz Null liegendes Spektrum gemäß Fig. 3 erzeugt. Das FIR-Filter 3 ist mit einer Impulsantwort gemäß Fig. 4 programmiert, so daß es ein punktsymmetrisch zur Frequenz Null liegendes Spektrum gemäß Fig. 5 erzeugt. Die Zusammenhänge zwischen Impulsantwort, Filterkoeffizienten und damit erzielbaren Filterdurchlaßkurven (Spektren) solcher FIR-Filter sind bekannt und sind beispielsweise in dem Lehrbuch "Netzwerke, Signale und Systeme", Band II von H.W. Schüßler, Springer- Verlag Berlin Heidelberg New York Tokyo, S. 521 oder in dem Aufsatz "Chebyshev Approximation for Nonrecursive Digital Filters with Linear Phase" von Parks und McClellan, IEEE Transactions on Circuit Theory, Vol. CT-19, No. 2, März 1972, S. 189- 194 näher beschrieben. Wenn die so an den Ausgängen 11 und 12 der FIR-Filter erzeugten Spektren nach Fig. 3 und 5 nach Digital-Analog-Wandlung den I- bzw. Q-Eingängen 13 bzw. 14 des Quadraturmodulators 6 zugeführt werden, so wird das Spektrum nach Fig. 5 zunächst nochmals um 90° phasengedreht, wie dies Fig. 6 zeigt. Durch die Addition der Spektren nach den Fig. 3 und 6 entsteht im Addierer 10 dann das gewünschte Restseitenbandspektrum nach Fig. 7, da die Spektrumanteile der Spektren nach Fig. 3 und 6 für Frequenzen größer als die Trägerfrequenz RF sich addieren während die Spektrumanteile für Frequenzen kleiner als die Trägerfrequenz RF sich teilweise auslöschen. Auf diese Weise wird das unsymmetrisch zur Trägerfrequenz RF liegende Restseitenbandspektrum gemäß Fig.7 erzeugt.The FIR filter 2 is programmed with an impulse response according to FIG. 2, so that it generates a spectrum according to FIG. 3 which is mirror-symmetrical to the frequency zero. The FIR filter 3 is programmed with an impulse response as shown in FIG. 4, so that it generates a spectrum as shown in FIG. 5 which is symmetrical about the frequency zero. The Relationships between impulse response, filter coefficients and thus achievable filter transmission curves (spectra) of such FIR filters are known and are described, for example, in the textbook "Networks, Signals and Systems", Volume II by HW Schuessler, Springer-Verlag Berlin Heidelberg New York Tokyo, p. 521 or in the essay "Chebyshev Approximation for Nonrecursive Digital Filters with Linear Phase" by Parks and McClellan, IEEE Transactions on Circuit Theory, Vol. CT-19, No. 2, March 1972, pp. 189-194. 3 and 5 after digital-to-analog conversion are fed to the I and Q inputs 13 and 14 of the quadrature modulator 6, respectively, so the spectrum becomes Fig. 5 first phase-rotated again by 90 °, as shown in Fig. 6. Adding the spectra according to FIGS. 3 and 6 then results in the desired residual sideband spectrum according to FIG. 7 in the adder 10, since the spectrum components of the spectra according to FIGS. 3 and 6 add up for frequencies greater than the carrier frequency RF, while the spectrum components for frequencies smaller than the carrier frequency RF partially cancel each other out. In this way, the residual sideband spectrum lying asymmetrically to the carrier frequency RF is generated according to FIG.
Gemäß Fig. 8 wird das digitale Videosignal im Basisband mit zwei frequenzmodulierten 5,5 MHz-Trägern, die den Fernsehton tragen, kombiniert. Dazu wird in bekannter Weise das analoge Tonsignal 1/L und das analoge Tonsignal 2/R durch Analog-Digital- Wandler 20, 21 digitalisiert. In zwei Addierschaltungen 22, 23 wird eine Pilotton 24 hinzugefügt. Nach Bandbegrenzung in entsprechenden FIR-Filtern 25, 26 werden durch direkte digitale Synthese (DDS) in Modulatoren 27, 28 die frequenzmodulierten 5,5 MHz-Träger erzeugt. Die so aufbereiteten beiden Stereosignale werden in einem Addierer 29 zu einem 5,5 MHz-FM- modulierten Trägersignal zusammengefaßt, das mit gegenseitiger 90°- Phasenverschiebung jeweils über Addierer 30, 31 den Ausgangssignalen der beiden FIR- Filter 2 und 3 zugesetzt wird. Über zwei anschließende weitere Addierer 32, 33 wird aus einem Restträgergeneerator 34 der Restträger für das amplitudenmodulierte Videosignal zugesetzt.8, the digital video signal in the baseband is combined with two frequency-modulated 5.5 MHz carriers which carry the television sound. For this purpose, the analog audio signal 1 / L and the analog audio signal 2 / R are digitized in a known manner by analog-digital converters 20, 21. A pilot tone 24 is added in two adding circuits 22, 23. After band limitation in corresponding FIR filters 25, 26, the frequency-modulated 5.5 MHz carriers are generated by direct digital synthesis (DDS) in modulators 27, 28. The two stereo signals processed in this way are combined in an adder 29 to form a 5.5 MHz FM-modulated carrier signal which is added to the output signals of the two FIR filters 2 and 3 with a mutual 90 ° phase shift in each case via adders 30, 31. Via two subsequent adders 32, 33, the residual carrier for the amplitude-modulated video signal is added from a residual carrier generator 34.
Über einen vor den FIR-Filtern 2 und 3 angeordneten Prozessor 35 kann die Empfängervorverzerrung ebenfalls bereits im Basisband vorgenommen werden, ebenso eine eventuell erforderliche Sender-Vorverzerrung für nachgeschaltete nichtlineare Verstärker des Fernsehsenders, wie dies durch den Prozessor 36 gestrichelt angedeutet ist. Anstelle der in Fig. 8 dargestellten kombinierten Signalaufbereitung von Audio- und Videosignal bereits im Basisband ist auch eine getrennt Video- und Tonaufbereitung möglich, wobei die getrennt aufbereiteten Signale in bekannter Weise (beispielsweise nach "Taschenbuch der Hochfrequenztechnik", Meinke/Gundlach, S. P25, Fig. 3) erst in der Hochfrequenzlage zusammengeführt werden. In diesem Fall ist ein zweiter Quadraturmodulator am Ausgang des Addierers 29 vorgesehen. The receiver predistortion can also be carried out in the baseband via a processor 35 arranged in front of the FIR filters 2 and 3, as can any transmitter predistortion that may be required for downstream non-linear amplifiers of the television transmitter, as indicated by the processor 36 in broken lines. Instead of the combined signal processing of audio and video signal shown in FIG. 8 already in the baseband, separate video and sound processing is also possible, the separately processed signals being known in a known manner (for example according to "Taschenbuch der Hochfrequenztechnik", Meinke / Gundlach, S. P25, Fig. 3) are brought together only in the high frequency position. In this case, a second quadrature modulator is provided at the output of the adder 29.

Claims

Patentansprüche claims
1. Verfahren zur Restseitenbandmodulation des Trägers eines Fernsehsenders mit einem Videosignal dadurch gekennzeichnet, daß das Videosignal im Basisband in zwei Signal teile aufgeteilt wird und diese Signalteile in einem Quadraturmodulator dem Träger aufmoduliert werden.1. A method for residual sideband modulation of the carrier of a television transmitter with a video signal, characterized in that the video signal in the baseband is divided into two signal parts and these signal parts are modulated onto the carrier in a quadrature modulator.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Videosignal im Basisband in zwei in Quadratur zueinander stehende Signalteile aufgeteilt wird und diese Signalteile dem I- bzw. Q-Eingang eines mit der Trägerfrequenz gespeisten Quadraturmodultors zugeführt werden.2. The method according to claim 1, characterized in that the video signal in the baseband is divided into two quadrature signal parts and these signal parts are fed to the I or Q input of a quadrature module fed with the carrier frequency.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das digitalisierte Videosignal im Basisband mittels digitaler Filter in zwei in Quadratur zueinander stehende digitale Signalteile aufgeteilt wird und diese digitalen Signalteile nach Digital/Analog-Wandlung dem I- bzw. Q-Eingang des Quadraturmodulators zugeführt werden.3. The method according to claim 1 or 2, characterized in that the digitized video signal in the baseband is divided by means of digital filters into two quadrature digital signal parts and these digital signal parts after digital / analog conversion to the I or Q input of Quadrature modulator are supplied.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Filterkoeffizienten der digitalen Filter so gewählt sind, daß die Spektren der beiden Signalteile bei ihrer Zusammenfassung im Quadraturmodulator das gewünschte Restseitenbandspektrum auf der Trägerfrequenz ergeben.4. The method according to claim 3, characterized in that the filter coefficients of the digital filters are chosen so that the spectra of the two signal parts when combined in the quadrature modulator give the desired residual sideband spectrum on the carrier frequency.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß den beiden Signalteilen im Basisband ein Restträger hinzuaddiert wird.5. The method according to any one of the preceding claims, characterized in that a residual carrier is added to the two signal parts in the baseband.
6. Verfahren nach einem der vorhergehenden Ansprüche, gekennzeichnet durch daß vor den Filtern eine Empfänger- Vorentzerrung des Videosignals durchgeführt wird. 6. The method according to any one of the preceding claims, characterized in that a receiver pre-equalization of the video signal is carried out before the filters.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß vor dem Quadraturmodulator eine Sender- Vorverzerrung des Videosignals durchgeführt wird.7. The method according to any one of the preceding claims, characterized in that a transmitter pre-distortion of the video signal is carried out in front of the quadrature modulator.
8. Verfahren nach einem der vorhergehenden Ansprüche zur gleichzeitigen Übertragung eines Audiosignals, dadurch gekennzeichnet, daß der frequenzmodulierte Mono- oder Stereo-Tonsignal-Träger in zwei in Quadratur zueinander stehende Trägersignal teile aufgeteilt wird, die den in8. The method according to any one of the preceding claims for the simultaneous transmission of an audio signal, characterized in that the frequency-modulated mono or stereo sound signal carrier is divided into two carrier signals in quadrature to each other, which the in
Quadratur zueinander stehenden Videosignal teilen hinzuaddiert werden.Quadrature related video signal parts can be added.
9. Anordnung zum Ausführen eines Verfahrens nach einem oder mehreren der vorhergehenden Ansprüche 1 bis 8, gekennzeichnet durch zwei FIR-Filter (2,3), von denen das erste (2) mit einer solchen Impulsantwort (Fig. 2) programmiert ist, daß ein Spektrum spiegelsymmetrisch zur Frequenz Null (Fig. 3) entsteht, und das zweite Filter (3) mit einer solchen Impulsantwort (Fig. 4) progammiert ist, daß ein Spektrum punktsymmetrisch zur Frequenz Null (Fig. 5) entsteht, wobei das erste Filter (2) mit dem I-Eingang (13) und das zweite Filter (3) mit dem Q-Eingang (14) eines Quadraturmodulators (6) verbunden ist und die beiden Mischer (8,9) des Quadraturmodulators über einen Trägeroszillator (7) gespeist sind. 9. Arrangement for performing a method according to one or more of the preceding claims 1 to 8, characterized by two FIR filters (2,3), of which the first (2) is programmed with such an impulse response (Fig. 2) that a spectrum is formed symmetrically to the frequency zero (Fig. 3), and the second filter (3) is programmed with such an impulse response (Fig. 4) that a spectrum is symmetrical to the frequency zero (Fig. 5), the first filter (2) with the I-input (13) and the second filter (3) with the Q-input (14) of a quadrature modulator (6) and the two mixers (8,9) of the quadrature modulator via a carrier oscillator (7) are fed.
PCT/EP1998/004436 1997-07-18 1998-07-16 Method and device for vestigial sideband modulation of a television transmitter WO1999004558A1 (en)

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DE1997131012 DE19731012B4 (en) 1997-07-18 1997-07-18 Arrangement for generating a vestigial sideband modulated video signal with residual carrier for a television station
DE19731012.5 1997-07-18

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US6724832B1 (en) 1999-01-29 2004-04-20 Adc Broadband Wireless Group, Inc. Vestigial sideband generator particularly for digital television
US7184724B1 (en) 2000-04-18 2007-02-27 Microtune (Texas), L.P. System and method for frequency translation using an image reject mixer

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