EP0835561B1 - Modulationsverfahren und -schaltungsanordnung zur übertragung von datensignalen - Google Patents
Modulationsverfahren und -schaltungsanordnung zur übertragung von datensignalen Download PDFInfo
- Publication number
- EP0835561B1 EP0835561B1 EP96920700A EP96920700A EP0835561B1 EP 0835561 B1 EP0835561 B1 EP 0835561B1 EP 96920700 A EP96920700 A EP 96920700A EP 96920700 A EP96920700 A EP 96920700A EP 0835561 B1 EP0835561 B1 EP 0835561B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- data signals
- signal
- rds
- transmission
- single sideband
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
Definitions
- the invention relates to a modulation method and a Circuit arrangement for the transmission of data signals and a receiver to receive the according to the procedure modulated and transmitted data signals.
- Double sideband modulation basically Double sideband modulation known.
- Double sideband modulation in the different areas of news channels again, like that Differen ignal of the stereo transmission, the RDS signal for Transmission of program-related additional information in FM radio broadcasting and the color information of the Television broadcast.
- WO 85/05748 is already one Application of PSK modulations of a subcarrier for the compatible AM broadcast data transmission.
- the carrier necessary for demodulating a DSB modulation is generated, for example, in stereo transmission in which the pilot frequency of 19 kHz to generate the 38 kHz Carrier in the FM multiplex signal is also transmitted.
- the RDS demodulator chip called SAA6579T As an example the RDS demodulator chip called SAA6579T.
- a general problem with the transfer of Radio messages of analog or digital type are provided by represents the required bandwidth of the modulation product means you have to be international or national, the natural resource of what can be used for "news" Optimal use of the frequency band.
- SSB Single sideband process
- the invention is therefore based on the object Method and a circuit arrangement for the transmission of Data signals via transmitters with a large coverage range to develop, the disadvantages mentioned largely be avoided.
- the inventive method, the circuit arrangement according to the invention and the Recipients according to the invention should be quick and inexpensive be feasible, do not require the development of new chips and enable immediate use in end devices.
- This task is accomplished using a single sideband transmission the RDS modulation (SSB-RDS) by the characteristics of claim 1 or claim 6 for the Circuit arrangement solved.
- SSB-RDS single sideband transmission the RDS modulation
- DBS digital double sideband modulation
- QDSB Quadrature double sideband modulation
- the filter method For example, by using the filter method either the lower or the upper sideband of the RDS Generate signals.
- the digital single-sideband modulation obtained in this way can be mixed with a corresponding oscillator frequency into the desired one Transpose the transmission spectrum as can be seen from FIG. 2.
- the RDS signal on Broadcasting long wave are overcome in that SSB methods known from analog transmission technology be transferred to the RDS QDSB modulation.
- the difference to analog SSB modulation is Demodulation a frequency and phase correct carrier for To make available.
- Fig. 1 is the RDS signal with its sidebands shown.
- the processing of the RDS QDSB signal for the Long wave application is shown in Fig. 2.
- a supplier of the RDS QDSB signal with carrier can be usually any RDS encoder known from FM RDS use.
- the filter depends on the selected oscillator frequency of the first frequency conversion the lower (LSB + carrier) or the upper (USB + carrier) sideband available in the ZF location.
- the second Frequency conversion serves the SSB of the RDS signal obtained with residual carrier (carrier reduced to the maximum of Sideband amplitudes) to the desired transmission frequency transpose.
- the signal amplified to the corresponding transmission power.
- Way the SSB signal is generated filter method, Phase method or synthetic generation
- the application for higher quality modulation types, which are due to a DSB is not to exclude.
- the use of the procedure is not on tied the long wave range.
- demodulation is synchronous (more coherent Demodulator with frequency and phase correct subcarrier) as well as asynchronous (without subcarrier) possible.
- synchronous demodulation it is necessary a residual carrier in quadrature to the sideband to transmit on the transmission side.
- Demodulation takes place via synchronous demodulators, the transmitted residual carrier is used for synchronous demodulation.
- Demodulation takes place directly in the baseband. Becomes asynchronous demodulated, it must be ensured on the receiving side that that the non-existing carrier cover of the side band through the demodulator is ensured.
- the single-sideband transmission of the RDS signal (SSB-RDS) is tested on long wave with the frequency 123.7 kHz, a circuit described below according to FIG. 2 have proven to be technically feasible and advantageous Has.
- data source 1 is a RDS coder 2 is used, which is a QDSB modulation with or can also provide without carrier frequency.
- Residual carriers generated using the filter method at 5 and by mixing using a second mixer 6, that of a carrier is fed to a second oscillator 7 the transmission frequency implemented and amplified at 8 and Posted.
- the residual carrier that can be switched on at the RDS encoder can thus be used ARI carriers can be used.
- To receive the SSB-RDS signal becomes a well-known all-band receiver with synchronous demodulator used.
- the further processing of the RDS baseband (Biphase signal) does not cause any technical problems.
- the Application of the method is not on the long wave range bound.
- the high-frequency signals are fed from the antenna 13 to an input amplifier 14.
- the amplified high-frequency signal is then converted into the IF range in a mixer stage 16 and passed through a bandpass filter 17 with a bandwidth of 2.4 kHz.
- a commercially available RDS demodulator 18 of the type SAA6579T each of which has an output 19, 20 for a clock signal and a data signal.
Description
- Fig. 1
- eine Einseitenband-Übertragung der RDS-Modulation,
- Fig. 2
- ein Prinzipschaltbild zur Realisierung des erfindungsgemäßen Verfahrens und
- Fig. 3
- ein Prinzipschaltbild eines Empfängers.
- ARI
- Autofahrer Rundfunkinformation
- RDS
- Radio Daten System
- SSB
- Einseitenband (single side band)
- DSB
- Doppelseitenband (double side band)
- QDSB
- Quadratur-Doppelseitenband-Modulation
- USB
- oberes Seitenband (upper side band)
- LSB
- unteres Seitenband (lower side band)
- PSK
- Phasen-Umtastung (phase shift keying)
- ZF
- Zwischenfrequenz
Claims (10)
- Modulationsverfahren zur Übertragung von Datensignalen, wobei mit den Datensignalen ein erster Träger nach dem Quadratur-Doppelseitenband-Verfahren moduliert wird, wobei aus dem modulierten Signal durch Filter- bzw. Phasenmethode ein Einseitenbandsignal mit Restträger abgeleitet wird und wobei das Einseitenbandsignal durch Mischung mit einer Oszillatorfrequenz in den Langwellenbereich umgesetzt und das umgesetzte Einseitenbandsignal einschließlich des umgesetzten Restträgers abgestrahlt wird.
- Modulationsverfahren zur Übertragung von Datensignalen, wobei durch synthetische Generierung ein mit den Datensignalen doppelseitenband-moduliertes Einseitenbandsignal mit Restträger erzeugt wird und wobei das Einseitenbandsignal durch Mischung mit einer Oszillatorfrequenz in den Langwellenbereich umgesetzt und das umgesetzte Einseitenbandsignal einschließlich des umgesetzten Restträgers abgestrahlt wird.
- Modulationsverfahren nach Anspruch 1, dadurch gekennzeichnet, daß das modulierte Signal mit Hilfe eines Radio-Data-System-Codierers gewonnen wird.
- Modulationsverfahren nach einem der Ansprüche 1 oder 3, dadurch gekennzeichnet, daß das Einseitenbandsignal wahlweise als unteres oder oberes Seitenband des modulierten Signals durch Filter erzeugt wird.
- Schaltungsanordnung zur Übertragung von Datensignalen, wobei die Datensignale einem RDS-Coder (2) zuführbar sind, wobei der Ausgang des RDS-Coders (2) mit einem Frequenzumsetzer (3, 4) verbunden ist, der seinerseits ausgangsseitig an ein Einseitenbandfilter (5) angeschlossen ist, dessen Ausgang mit einem weiteren Frequenzumsetzer (6, 7) zur Umsetzung in den Langwellenbereich verbunden ist, und wobei der Ausgang des weiteren Frequenzumsetzers (6, 7) an den Eingang eines Langwellensenders (8) angeschlossen ist.
- Empfänger zum Empfang von Datensignalen, wobei die Datensignale als Modulation eines Einseitenbandsignals mit Restträger, das zur Übertragung durch Mischung mit einer Oszillatorfrequenz in den Langwellenbereich umgesetzt wird, gesendet und empfangen werden und wobei Mittel (15, 16) zur Umsetzung des im Langwellenbereich empfangenen Signals in die Frequenzlage des Einseitenbandsignals mit Restträger vorgesehen sind, an deren Ausgang ein Bandpaß (17) angeschlossen ist, und daß der Bandpaß mit einem Demodulator (18) verbunden ist.
- Empfänger nach Anspruch 6, dadurch, gekennzeichnet, daß der Bandpaß eine Bandbreite (17) von 2,4 kHz aufweist und die Frequenz von 57 kHz einschließt.
- Empfänger nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß der Demodulator (18) ein an sich bekannter RDS-Demodulator ist.
- Empfänger zum Empfang von Datensignalen, wobei die Datensignale als Modulation eines Einseitenbandsignals mit Restträger, das zur Übertragung durch Mischung mit einer Oszillatorfrequenz in den Langwellenbereich umgesetzt wird, gesendet und empfangen werden und wobei der übertragene Restträger zur Synchrondemodulation verwendet wird.
- Empfänger zum Empfang von Datensignalen, wobei die Datensignale als Modulation eines Einseitenbandsignals mit Restträger, das zur Übertragung durch Mischung mit einer Oszillatorfrequenz in den Langwellenbereich umgesetzt wird, gesendet und empfangen werden und wobei das empfangene Seitenband asynchron demoduliert wird, insbesondere durch Analyse der spektralen Frequenzanteile des Modulationsproduktes.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19523414 | 1995-06-28 | ||
DE19523414 | 1995-06-28 | ||
DE19605381A DE19605381C2 (de) | 1995-06-28 | 1996-02-14 | Modulationsverfahren und -Schaltungsanordnung zur Übertragung von Datensignalen |
DE19605381 | 1996-02-14 | ||
PCT/DE1996/001124 WO1997001894A1 (de) | 1995-06-28 | 1996-06-26 | Modulationsverfahren und -schaltungsanordnung zur übertragung von datensignalen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0835561A1 EP0835561A1 (de) | 1998-04-15 |
EP0835561B1 true EP0835561B1 (de) | 2000-03-15 |
Family
ID=26016342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96920700A Expired - Lifetime EP0835561B1 (de) | 1995-06-28 | 1996-06-26 | Modulationsverfahren und -schaltungsanordnung zur übertragung von datensignalen |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0835561B1 (de) |
AT (1) | ATE190786T1 (de) |
BG (1) | BG62545B1 (de) |
CZ (1) | CZ288335B6 (de) |
EE (1) | EE03365B1 (de) |
HU (1) | HU220526B1 (de) |
PL (1) | PL181135B1 (de) |
RO (1) | RO119400B1 (de) |
RU (1) | RU2194368C2 (de) |
SK (1) | SK174797A3 (de) |
WO (1) | WO1997001894A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10003480B2 (en) | 2014-05-29 | 2018-06-19 | Qualcomm Incorporated | Asynchronous multicarrier communications |
PL414829A1 (pl) | 2015-11-17 | 2017-05-22 | Audiolink Technologies Spółka Z Ograniczoną Odpowiedzialnością | Sposób równoległego budowania przekazu informacji różnymi kanałami i układ do równoległego przesyłania informacji różnymi kanałami |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2948518A1 (de) * | 1979-12-01 | 1981-06-04 | Blaupunkt Werke Gmbh | Verfahren zum uebertragen von zusaetzlichen informationen |
JPS61501670A (ja) * | 1984-03-28 | 1986-08-07 | アメリカン テレフオン アンド テレグラフ カムパニ− | 単側波帯通信システム |
US4688255A (en) * | 1984-05-29 | 1987-08-18 | Kahn Leonard R | Compatible AM broadcast/data transmisison system |
DE3821014A1 (de) * | 1988-06-22 | 1989-12-28 | Licentia Gmbh | Verfahren zur digitalen phasenmodulation eines traegers durch datensignale und digitaler phasenmodulator zum ausfuehren des verfahrens |
-
1996
- 1996-06-26 AT AT96920700T patent/ATE190786T1/de active
- 1996-06-26 EE EE9700357A patent/EE03365B1/xx not_active IP Right Cessation
- 1996-06-26 WO PCT/DE1996/001124 patent/WO1997001894A1/de active IP Right Grant
- 1996-06-26 CZ CZ19973516A patent/CZ288335B6/cs not_active IP Right Cessation
- 1996-06-26 EP EP96920700A patent/EP0835561B1/de not_active Expired - Lifetime
- 1996-06-26 RO RO97-02425A patent/RO119400B1/ro unknown
- 1996-06-26 SK SK1747-97A patent/SK174797A3/sk unknown
- 1996-06-26 PL PL96324262A patent/PL181135B1/pl not_active IP Right Cessation
- 1996-06-26 HU HU9802364A patent/HU220526B1/hu not_active IP Right Cessation
- 1996-06-26 RU RU98100923/09A patent/RU2194368C2/ru not_active IP Right Cessation
-
1997
- 1997-12-01 BG BG102091A patent/BG62545B1/bg unknown
Also Published As
Publication number | Publication date |
---|---|
PL181135B1 (pl) | 2001-05-31 |
CZ288335B6 (en) | 2001-05-16 |
EE03365B1 (et) | 2001-02-15 |
ATE190786T1 (de) | 2000-04-15 |
HUP9802364A3 (en) | 2000-05-29 |
BG62545B1 (bg) | 2000-01-31 |
SK174797A3 (en) | 1998-11-04 |
BG102091A (en) | 1998-07-31 |
EP0835561A1 (de) | 1998-04-15 |
RO119400B1 (ro) | 2004-08-30 |
CZ351697A3 (cs) | 1998-04-15 |
PL324262A1 (en) | 1998-05-11 |
RU2194368C2 (ru) | 2002-12-10 |
WO1997001894A1 (de) | 1997-01-16 |
HUP9802364A2 (hu) | 1999-02-01 |
HU220526B1 (hu) | 2002-03-28 |
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