EP0874483A2 - Verfahren und Anordnung für eine analog-digitale Simultanübertragung von Rundfunksendungen in den AM-Frequenzbändern - Google Patents
Verfahren und Anordnung für eine analog-digitale Simultanübertragung von Rundfunksendungen in den AM-Frequenzbändern Download PDFInfo
- Publication number
- EP0874483A2 EP0874483A2 EP98106551A EP98106551A EP0874483A2 EP 0874483 A2 EP0874483 A2 EP 0874483A2 EP 98106551 A EP98106551 A EP 98106551A EP 98106551 A EP98106551 A EP 98106551A EP 0874483 A2 EP0874483 A2 EP 0874483A2
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- EP
- European Patent Office
- Prior art keywords
- modulation
- digital
- signal
- analog
- frequency
- 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.)
- Ceased
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/36—Arrangements for simultaneous broadcast of plural pieces of information for AM broadcasts
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
- H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/18—Aspects of broadcast communication characterised by the type of broadcast system in band on channel [IBOC]
- H04H2201/186—AM digital or hybrid
Definitions
- the invention relates to a method and an arrangement for an analog-digital simultaneous transmission of radio broadcasts in the AM frequency bands, especially in the Application for long, medium and short wave broadcasting, according to the generic terms of claims 1 and 5.
- the system "Skywave 2000" from Thomcast is a simultaneous transmission analog single sideband modulation and digital modulation in a shortwave channel have been presented ("worldwide listening", 4/97, pages 6 to 8), the digital Transmission is offset in frequency such that the two transmissions are frequency selective can be received.
- the principle of simultaneous transmission of analog and digital modulation offers an approach to overcoming the above Difficulty launching digital AM broadcasting.
- a disadvantage of that the aforementioned system is the single sideband transmission of the analog modulation, since this with standard AM receivers can only receive distorted and of it It can be assumed that there will be no nationwide coverage of the audience with single-sideband receivers is given or can be reached in the future.
- a single-sideband transmitter is necessary.
- the one for broadcasts used high-performance transmitter which is suitable for single sideband operation are characterized in that the envelope of the single sideband signal by means of a Amplifier is amplified and this amplified envelope signal for envelope modulation the phase-modulated high frequency amplified by means of high-frequency amplifiers is used in the power amplifier of the transmitter
- the envelope amplifier of the high-power transmitters described above special requirements when using the described separate reinforcement put. Since the envelope signal of a single sideband oscillation interacts with the modulation contains a changing DC component, although the low-frequency message to be transmitted contains no DC component, the envelope amplifier must be designed such that the DC component of the envelope can be amplified. This requirement is met by modern Switching amplifiers fulfilled, based on the principle of pulse duration amplification (PDM) or work according to the principle of pulse stage amplification (PSM). With older stations whose High-frequency output stages are modulated via modulation transformers is the gain of the direct component of the envelope signal is not possible because the modulation transformers cannot transfer the DC component.
- PDM pulse duration amplification
- PSM pulse stage amplification
- the bandwidth of the Envelope amplifier to make the requirement that he is able to at least the second harmonic of the highest low frequency to be transmitted with as little distortion as possible to be able to transfer.
- the reason for the increased bandwidth requirement is the fact that the actual low-frequency message is not amplified in the envelope amplifier is, but the envelope of the high-frequency emission, which in turn despite Bandwidth limitation of the low-frequency signal to be transmitted is in principle not limited.
- the invention has for its object a method for an analog-digital simultaneous transmission to create a broadcast in the AM frequency bands that is fully applicable to conventional AM transmitters and receivers Task also includes the creation of an arrangement for performing the above Procedure.
- the solution according to the invention only requires an AM transmitter to be sufficient Bandwidth; a transfer of a DC voltage component is not necessary, since the envelope signal with pure amplitude modulation in contrast to a single sideband transmission corresponds to the input signal and contains no DC component.
- the required bandwidth of the modulation amplifier corresponds to the sum of the Frequency offset between the "analog” and the "digital" carrier and half Bandwidth of the digital modulation signal.
- the arrangement shown in Fig.1 for sending a silicon analog-digital Broadcast transmission consists of a standard AM transmitter 1, two Oscillators 2 and 3, from a digital modulator 4 and from a summing element 5.
- the AM transmitter 1 receives its carrier f T from the oscillator 2 and is driven with a sum signal U GES , which consists of the analog NF signal NF to be transmitted and a digitally modulated signal U DIG .
- the digitally modulated signal U DIG is formed in the digital modulator 4 by means of a signal DS, which is designed as a digital data stream, and an auxiliary carrier f H.
- the sum signal U GES is formed in the summer 5.
- the signal DS is, for example, the output signal of an audio source encoder.
- the digital modulation is a single-carrier or a multi-carrier method with several frequency-shifted subcarriers f H. If there is only a limited modulation range for the digital modulation signal, it can be advantageous to use one
- the ratio between peak value and effective value (crest factor) is as low as possible in order to use the available modulation range as effectively as possible. Consequently, it then appears to be advantageous to carry out the digital modulation in the form of a single-carrier method instead of a multi-carrier method, since it is known that the crest factor of a multi-carrier method is greater in distortion-free transmission than in a comparable single-carrier method.
- the solution according to the invention is not based on the simultaneous transmission of a radio broadcast limited.
- One can on the analog and on the digital channel Many types of information, including information that deviates from one another on the channels, be transmitted. So instead of radio broadcasts, radio broadcasts, Embassy radio broadcasts and data broadcasts on the digital channel, Time broadcasts ... etc. with appropriate hardware adaptation and training of the analog NF signal NF and the signal DS are transmitted.
- the one Hardware adaptations required do not require the person skilled in the art to invent them Activities.
- the subcarrier f H generated in a single-carrier method with the oscillator 3 should preferably correspond to the channel grid frequency of the frequency range used, or an integral multiple of this frequency.
- a channel raster frequency of 9 kHz is used in the long and medium wave range, while a channel raster frequency of 5 kHz is used in the short wave range.
- FIG. 2 shows the spectrum of a transmission that is transmitted with an arrangement according to FIG.
- a single-carrier method with the auxiliary frequency f H is used in the example shown.
- the upper and lower sidebands of the analog modulation OSB AN and USB AN occur directly adjacent to the carrier f T.
- the upper and lower sidebands of the digital modulation OSB DI and USB DI appear at a distance of +/- f H from the carrier f T.
- the digital modulation U DIG and the analog NF signal NF are band-limited with suitable means before the application to the summer 5, no overlap of the spectra occurs during transmission and interference-free transmission of the signals can be expected.
- a conventional AM receiver is required to receive the analog signal and a corresponding digital receiver is required to receive the digitized information.
- the conventional AM receiver is tuned to the frequency of the carrier f T and, due to its design, has a bandwidth that filters out the AM signal, consisting of the upper and lower sidebands of the analog modulation OSB AN and USB AN, and thus the sidebands the digital modulation OSB DI and USB DI suppressed.
- the digital receiver is tuned according to the frequency of the subcarrier f H to the offset subcarriers f T - f H or f T + f H if only one digital sideband is to be received. If the digital receiver is to evaluate both digital sidebands, it is tuned to the frequency of the carrier f T. A filter contained in the receiver then suppresses the AM transmission. This signal processing makes it possible to evaluate the two digital sidebands. If the digital sidebands were derived from coupled digital data streams, both partial data streams can be received and combined again at the same time.
- the required bandwidth of the AM transmitter 1 can be read from FIG. For the exemplary embodiment according to FIG. 1, it corresponds to the sum of the offset of the subcarrier f H and half the bandwidth of the digital modulation signal.
- Fig3. An arrangement for carrying out the invention is shown, in which, in contrast to the embodiment described above in relation to FIG. 1, the AM transmitter 1 is driven with a phase-modulated carrier-frequency oscillation.
- the phase modulation is selected such that the upper or the lower sideband of the digital modulation OSB DI or USB DI is suppressed in the resulting transmission.
- the arrangement shown in FIG. 3 for transmitting a standard analog-digital radio transmission consists of a standard AM transmitter 1, two oscillators 2 and 3, from a digital modulator 4 and a signal conditioning module 6.
- the AM transmitter 1 receives its phase-modulated carrier f PH from the signal processing module 6, to which a carrier f T generated by the oscillator 2 is fed.
- the AM transmitter 1 is controlled with an envelope signal U HÜLL , which is generated in the signal conditioning module 6 from the analog LF signal NF to be transmitted and from a digitally modulated signal U DIG .
- the digitally modulated signal U DIG is formed in the digital modulator 4 by means of a signal DS and an auxiliary carrier f H.
- phase modulation of the carrier f T and the associated envelope signal for the AM transmitter 1 required to suppress one of the digital sidebands is carried out in the signal processing module 6 in a manner known to the person skilled in the art.
- this phase modulation ensures that the amplitudes of the remaining digital sideband are increased. This measure improves the utilization of the transmitted spectrum.
- the demands on the AM transmitter increase, since an overall signal is now transmitted which contains a single sideband component, the digitally modulated component. If the amplitude of the subcarrier f H is small compared to the amplitude of the carrier f T , it can be expected that a broadband transmission of the envelope signal will not be necessary, since the harmonic content of the envelope curve becomes disproportionately lower as the subcarrier becomes smaller and consequently incorrect transmission the low envelope harmonics will only cause a negligible error in the modulation process. It can be shown that with a modulation of 10%, the portion of the upper part of the envelope is approx. 30 dB smaller than the amplitude of the fundamental wave.
- the AM transmitter 1 thus actuated consists of an envelope amplifier 1.1, a high-frequency amplifier 1.2 and an output stage 1.3, which is equipped with a tube, for example.
- the signal DS digitally modulated onto the subcarrier f H arrives as signal U DIG via an input stage 6.1 on the one hand to a Hilber transformer 6.3 and on the other hand to the input of a delay element 6.2 which compensates for the delay time of the Hilber transformer 6.3.
- the output signals from the runtime and Hilber transformers correspond to the in-phase and quadrature components of the output signal of the AM transmitter 1.
- the analog NF signal NF is superimposed on the in-phase component by addition in a summer 6.4.
- the envelope signal U HÜLL is formed from this in-phase component, modified by the analog modulation, and the quadrature component calculated in the Hilbert transformer in an absolute value generator 6.5.
- the magnitude signal thus formed is used to control the envelope amplifier 1.1.
- the amount is formed, for example, by forming the square root from the sum of the squared in-phase and quadrature components and a carrier additive T. This carrier additive T is added via a summer 6.14 to the analog NF signal NF on the input
- the in-phase and quadrature components also become dividers 6.6 and 6.7 guided.
- the signals standardized by the amount are in Delay elements 6.8 and 6.9 are delayed in such a way that the envelope amplifier's delay time 1.1 is compensated so that when merging the signals in the power amplifier Runtime difference occurs.
- modulators 6.10 and 6.11 the signal components are modulated onto two carrier-frequency oscillations of the same amplitude that are shifted by 90 ° relative to one another by multiplication.
- a phase shifter 6.12 two oscillations phase-shifted by 90 ° are formed from the supplied carrier f T.
- the signal suitable for carrier-frequency control of the AM transmitter 1 is then generated from these modulated carrier-frequency vibrations in a summer 6.13.
- This signal is amplified in the high-frequency amplifier 1.2 of the AM transmitter 1 to the power level required to control the output stage.
- the phase-modulated carrier-frequency oscillation is amplified to its final value, the amplitude of the transmission being determined by the output voltage of the envelope amplifier 1.1, which serves as the supply voltage for the final stage.
- Both a transistorized amplifier and a tube amplifier are used as the output stage suitable.
- the output amplitude of the transmission determined via the collector or drain voltage serving as supply voltage, while with the tube transmitter, the anode voltage is the one working in overvoltage mode Tube determines the amplitude of the output voltage.
- FIG. 6 An arrangement is shown in FIG. 6 which allows simultaneous analog modulation to send two digital modulation signals with different information.
- the digital modulation signals can contain two digital data streams from a common data source by dividing the common data stream arise. This division enables larger data rates to be transmitted, because only part of the total data stream is transmitted in each digital sideband. In the receiver, these two separate partial data streams can then return to the original data stream.
- the two different pieces of information are each modulated in a known manner in a digital modulator on at least one subcarrier f H and, as digitally modulated signals U DIG1 and U DIG2, input stages 6.1 and 6.15 are fed to the arrangement shown in FIG. Via input stages 6.1 and 6.15, they arrive at Hilbert transformers 6.3 and 6.17 and in parallel to runtime elements 6.2 and 6.16, which compensate for the runtime of the Hilbert transformers.
- the in-phase components of the digitally modulated signals U DIG1 and U DIG2 are available at the outputs of the delay elements and the quadrature components of the digitally modulated signals U DIG1 and U DIG2 are available for further processing at the outputs of the Hilbert transformers.
- the in-phase signals are added in phase in a summer 6.4, while the quadrature components are only added in a summer 6.19 after inverting one of the quadrature components, which takes place in an inverter 6.18.
- the corresponding digitally modulated signal - for example the signal U DIG2 is selected here - is shifted into the other side band.
- the analog NF signal NF, on which the carrier additive T is superimposed in the summer 6.14 is given on the totalizer 6.4 for the in-phase components.
- the arrangement shown in FIG. 6 is identical 5 with the arrangement shown in FIG. 5, so that the description the function blocks downstream of the entrance area to the previous ones Fig.5 made statements can be removed.
- FIG. 5 and in FIG. 6 can be implemented using digital signal processing modules or in the form of analog modules.
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Abstract
Description
- Fig.1
- zeigt eine Anordnung zur Aussendung einer simultanen analog-digitalen Rundfünkübertragung,
- Fig.2
- zeigt das Spektrum der Aussendung der in Fig. 1 gezeigten Anordnung,
- Fig.3
- zeigt eine Anordnung zur simultanen analog-digitalen Rundfunkübertragung mit einer Seitenbandunterdrückung bei der digitalen Modulation,
- Fig.4
- zeigt das Spektrum der resultierenden Aussendung des in Fig.3 gezeigten Verfahrens,
- Fig.5
- zeigt eine Ausbildung eines Signalaufbereitungsmodules für das in Fig.3 gezeigte Verfahren und
- Fig.6
- zeigt eine Anordung zur simultanen Aussendung von einer analogen und zwei unterschiedlichen digitalen Modulationen.
Claims (9)
- Verfahren zur analog-digitalen Simultanübertragung von Rundfunksendungen in den AM-Frequenzbändern mit einem Träger für die analoge Modulation und mindestens einem frequenzmäßig versetzten Hilfsträger für die digitale Modulation, dadurch gekennzeichnet, daß die analoge Modulation als Zweiseitenbandmodulation erfolgt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß durch geeignete Phasen- und Amplitudenmodulation des hochfrequenten Trägers ein digitales Seitenband unterdrückt ist.
- Verfahren nach Ansprüche 1, dadurch gekennzeichnet, daß durch geeignete Phasen- und Amplitudenmodulation zwei digitale Seitenbänder mit unterschiedlichen Modulationsinhalten übertragen sind.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die digitalen Seitenbänder aus verkoppelten Datenströmen hervorgehen.
- Anordnung zur analog-digitalen Simultanübertragung einer Rundfunksendung in den AM-Frequenzbändern mit einem Träger für die analoge Modulation und mindestens einem frequenzmäßig versetzten Hilfsträger für die digitale Modulation, dadurch gekennzeichnet, daß die Simultanübertragung mit einem AM-Sender (1) ausgesendet ist, dessen Träger (fT) mit einem Summensignal (UGES) moduliert ist, das sich aus dem zu übertragenden anlogen NF-Signal (NF) und einem digital modulierten Signal (UDIG) zusammensetzt, wobei letzteres durch digitale Modulation mindestens eines frequenzmäßig versetzten Hilfsträgers (fH) mit einem Signal (DS) entsteht und der Frequenzversatz des Hilfsträgers (fH) - oder der Hilfsträger (fH) - so gewählt ist, daß die Spektren der analogen und der digitalen Modulation voneinander getrennt sind.
- Anordnung nach Anspruch 5, dadurch gekennzeichnet, daß in einem Signalaufbereitungsmodul (6) aus dem analogen NF-Signal (NF) und aus dem digital modulierten Signal (UDIG) der Betrag eines Hüllkurvensignales (UHÜLL) und der zugehörige hochfrequente phasenmodulierte Träger (fPH) abgeleitet sind und daß mit diesen abgeleiteten Signalen die nieder- und hochfrequente Ansteuerung des AM-Senders (1) durchgeführt ist.
- Anordnung nach Anspruch 6, dadurch gekennzeichnt, daß das Hüllkurvensignal (UHÜLL) und der phasenmodulierte Träger (fPH) in dem Signalaufbereitungsmodul (6) derart abgeleitet sind, daß wahlweise nur das obere oder das untere Seitenband der digitalen Modulation (OSBDI, USBDI) entsteht.
- Anordnung nach Anspruch 6, dadurch gekennzeichnt, daß das Hüllkurvensignal (UHÜLL) und der phasenmodulierte Träger (fPH) derart abgeleitet sind, daß das obere und das untere Seitenband der digitalen Modulation (OSBDI, USBDI) unterschiedliche Modulationsinhalte enthalten, wobei die Modulationsinhalte aus einer gemeinsamen Datenstromquelle durch Aufteilung des damit erzeugten Datenstromes abgeleitet sind.
- Anordnung nach Anspruch 6, dadurch gekennzeichnt, daß das Hüllkurvensignal (UHÜLL) und der phasenmodulierte Träger (fPH) derart abgeleitet sind, daß das obere und das untere Seitenband der digitalen Modulation (OSBDI, USBDI) unterschiedliche Modulationsinhalte enthalten, wobei die Modulationsinhalte aus zwei Datenstromquellen abgeleitet sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19717169 | 1997-04-23 | ||
DE1997117169 DE19717169A1 (de) | 1997-04-23 | 1997-04-23 | Verfahren und Anordnung für eine analog-digitale Simultanübertragung von Rundfunksendungen in den AM-Frequenzbändern |
Publications (2)
Publication Number | Publication Date |
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EP0874483A2 true EP0874483A2 (de) | 1998-10-28 |
EP0874483A3 EP0874483A3 (de) | 1999-08-11 |
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EP98106551A Ceased EP0874483A3 (de) | 1997-04-23 | 1998-04-09 | Verfahren und Anordnung für eine analog-digitale Simultanübertragung von Rundfunksendungen in den AM-Frequenzbändern |
Country Status (2)
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EP (1) | EP0874483A3 (de) |
DE (1) | DE19717169A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002071663A3 (de) * | 2001-03-06 | 2003-10-02 | Deutsche Telekom Ag | VERFAHREN ZUR VERRINGERUNG DER AUssERBANDSTRAHLUNG BEI AM-SENDERN FÜR DIGITALE ÜBERTRAGUNG |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19911437A1 (de) * | 1999-03-04 | 2000-09-07 | Deutsche Telekom Ag | Verfahren und Anordnung für digitale Übertragung mit amplitudenmodulierten Sendern mit Modulationstransformator |
US7011790B2 (en) | 2001-05-07 | 2006-03-14 | Regents Of The University Of Minnesota | Non-thermal disinfection of biological fluids using non-thermal plasma |
US6562386B2 (en) | 2001-05-07 | 2003-05-13 | Regents Of The University Of Minnesota | Method and apparatus for non-thermal pasteurization |
DE10131849A1 (de) | 2001-06-27 | 2003-01-16 | Deutsche Telekom Ag | Verfahren zur Vermeidung von Störausstrahlungen bei AM-Sendern für digitale Übertragung |
US7931811B2 (en) | 2006-10-27 | 2011-04-26 | Regents Of The University Of Minnesota | Dielectric barrier reactor having concentrated electric field |
EP2502429B1 (de) | 2009-11-17 | 2014-06-25 | Phonak AG | Hörhilfesystem und verfahren |
EP2502428B1 (de) | 2009-11-17 | 2014-06-25 | Phonak AG | Hörhilfesystem und verfahren |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5588022A (en) * | 1994-03-07 | 1996-12-24 | Xetron Corp. | Method and apparatus for AM compatible digital broadcasting |
WO1997008866A1 (en) * | 1995-08-31 | 1997-03-06 | Usa Digital Radio Partners, L.P. | Am compatible digital waveform frame timing recovery and frame synchronous power measurement |
-
1997
- 1997-04-23 DE DE1997117169 patent/DE19717169A1/de not_active Withdrawn
-
1998
- 1998-04-09 EP EP98106551A patent/EP0874483A3/de not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5588022A (en) * | 1994-03-07 | 1996-12-24 | Xetron Corp. | Method and apparatus for AM compatible digital broadcasting |
WO1997008866A1 (en) * | 1995-08-31 | 1997-03-06 | Usa Digital Radio Partners, L.P. | Am compatible digital waveform frame timing recovery and frame synchronous power measurement |
Non-Patent Citations (3)
Title |
---|
A.J. VIGIL: "Wireless data transmission through in-band on-channel digital audio broadcasting" WIRELESS DATA TRANSMISSION, PROCEEDINGS OF THE SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING, Bd. 2601, 23. - 25. Oktober 1995, Seiten 105 -114, XP002106406 Philadelphia, Pennsylvania * |
BRIAN W. KROEGER, D.SC. AND PAUL J. PEYLA: "Robust IBOC DAB AM and FM technology for digital audio broadcasting" 51ST ANNUAL BROADCAST ENGINEERING CONFERENCE (NAB),April 1997, XP002104796 Las vegas, Nevada * |
EDWARD Y. CHEN: "Digital Audio Radio - An application of Audio Compression Technology" PROCEEDINGS OF THE IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY, 1996, 1996, Seiten 796-800, XP010232549 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002071663A3 (de) * | 2001-03-06 | 2003-10-02 | Deutsche Telekom Ag | VERFAHREN ZUR VERRINGERUNG DER AUssERBANDSTRAHLUNG BEI AM-SENDERN FÜR DIGITALE ÜBERTRAGUNG |
US7248639B2 (en) | 2001-03-06 | 2007-07-24 | Deutsche Telekom Ag | Method for reducing the out-of-band emission in AM transmitters for digital transmission |
Also Published As
Publication number | Publication date |
---|---|
EP0874483A3 (de) | 1999-08-11 |
DE19717169A1 (de) | 1998-10-29 |
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