EP0994588A2 - Vorrichtung in einem zum Empfang von Radio-Daten geeigneten Rundfunkempfänger für die Demodulation eines Multiplexsignals - Google Patents
Vorrichtung in einem zum Empfang von Radio-Daten geeigneten Rundfunkempfänger für die Demodulation eines Multiplexsignals Download PDFInfo
- Publication number
- EP0994588A2 EP0994588A2 EP99114653A EP99114653A EP0994588A2 EP 0994588 A2 EP0994588 A2 EP 0994588A2 EP 99114653 A EP99114653 A EP 99114653A EP 99114653 A EP99114653 A EP 99114653A EP 0994588 A2 EP0994588 A2 EP 0994588A2
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- EP
- European Patent Office
- Prior art keywords
- rds
- signal
- data
- demodulation path
- demodulator
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
- H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
-
- 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
- H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
Definitions
- the invention relates to a demodulator for a multiplex signal (MPX signal) an RDS (radio data system) radio receiver, which at least one stereo signal, one radio data system signal (RDS signal) and possibly contains a traffic radio signal (VF signal), the demodulator an input bandpass filter to filter out the RDS signal and the VF signal which has a first demodulation path to Selecting RDS data from the RDS signal is subordinate, according to the preamble of claim 1.
- the invention further relates to a Method for selecting RDS data of an alternative frequency to be checked for a mother frequency tuned to an RDS radio receiver, according to the preamble of claim 9.
- radio stations According to the "Specifications of the radio data system RDS for VHF / FM broadcasting "of the European Broadcasting Union of March 1984 (EBU specification DIN EN50067) are based on the transmission frequencies of the In addition to the actual radio program, radio stations also digital Data, including codes identifying the transmission frequencies from a country code, a regional code to identify the restricted distribution of the broadcast over the transmission frequency Program and a transmitter or program identifier.
- RDS R adio- D aten- S ystems
- This RDS signal also contains information which may be communicated to the driver or a user on a display of the RDS car radio in the form of a station name.
- the RDS signal is DIN in the EBU specification mentioned above EN50067 specifies and contains or transmits with the transmitter signal a frequency currently set on the RDS radio receiver, hereinafter also called the mother frequency (MF), one currently on RDS car radio set radio station to differentiate the different radio transmitters with correspondingly different transmitter chains a program identification code, hereinafter PI code or abbreviated PI.
- PI code a program identification code
- the country code is used for coding of the country in which the respective program is broadcast, the regional identifier gives the spatial distribution of the over the respective frequency broadcast program, while the station identification the Broadcaster and the respective program identifies.
- the country code and the regional identifier are four bits and the transmitter identifier is encoded with eight bits.
- an RDS demodulator is provided in a conventional RDS radio receiver and is synchronized to a data stream of a tuned frequency. If an alternative frequency (AF) is to be checked, for example in order to determine a reception quality on this AF by measuring the field strength, the RDS radio receiver must be tuned to this AF.
- AF alternative frequency
- the dwell time on the AF is only a few milliseconds so that the absence of the mother frequency is not audible to the user.
- the synchronization to the RDS data stream of the mother frequency after it is established once was, by a so-called “flywheel” explained below maintained so that in the event of interference, interruptions or short jumps on the AF when returning to the synchronization Data stream on the mother frequency is still given. This will result in data loss minimized on the mother frequency.
- the flywheel is essentially a PLL oscillator that works even in the absence of an input signal continues to run. If there is no input signal, one of the Input signal controlled tracking of the PLL oscillator, so to speak "frozen". Depending on the quality of the oscillator, time periods of can be bridged for up to a few seconds without the synchronization get lost.
- the RDS demodutator has relatively long run-in and bit collection times, which causes audible interruptions during a PI code check of an AF one currently by a user through the RDS broadcast receiver belonged to the radio program and possibly to loss of information for the user, because that was originally on the RDS radio receiver set radio program to avoid PI code check malfunctions due to possible external modulation must be muted.
- a second demodulation path is provided, which the first demodulation path is connected in parallel such that either the first or second demodulation path with the input bandpass filter is connectable, the second demodulation path also being a clock recovery device and / or a synchronization device includes, which generates a system clock from the RDS data and also Without an RDS signal, the system clock is maintained for a predetermined period of time receives.
- the first and / or second Demodulation path from the input bandpass filter in the data stream direction the following, a mixer device which separates an in-phase and a quadrature component from the MPX signal, a biphase decoder and a differential decoder, the two the latter decoder together demodulate the RDS data.
- the mixer device expediently comprises a Costas demodulator with 57 kHz PLL oscillator carrier processing.
- the first demodulation path is a clock recovery device which includes a system clock from the RDS data generated.
- Accurate system clock generation with a long hold time even without RDS signal is achieved by the clock recovery device includes a 1.1875 kHz PLL oscillator.
- a composition of successively collected RDS data fragments to complete RDS data is achieved by the first and / or the second demodulation path for intermediate storage of recorded RDS data or recorded RDS data fragments an im Bit clock of the incoming information controlled storage device is connected downstream.
- An accurate system clock with variable hold time even after a downshift from the second demodulation path to the first demodulation path is achieved in that the clock recovery device of the first and second demodulation paths a 1.1875 kHz PLL oscillator includes.
- a switch to the second demodulation path inaudible to a user for selecting RDS data on an alternative frequency is achieved in that a dwell time on the alternative frequency RDS data is 8 ms or less.
- a to be processed by the demodulator 100 shown in FIG Multiplex signal (MPX signal) of an RDS radio receiver comprises at least one stereo signal, one radio data system signal (RDS signal) and possibly an analog traffic signal (VF signal), the RDS signal is in quadrature with the VF signal, i.e. 90 degrees to the VF signal Is out of phase.
- MPX signal Multiplex signal
- RDS signal radio data system signal
- VF signal analog traffic signal
- a 57 kHz bandpass filter is used to evaluate the MPX signal 10 filtered out the stereo band, so that only the RDS signal and the VF signal can be fed to a first demodulation path 12 are.
- the 57 kHz bandpass filter 10 is either the MPX signal a mother frequency currently set on the RDS radio receiver or an MPX signal of an alternative frequency to be checked (AF) on.
- AF alternative frequency to be checked
- To check the AF are transmitted on the AF RDS data or a PI code evaluated in such a way that it can be determined whether AF is a valid and also receivable AF for the mother frequency or not.
- the evaluation of the MPX signal or the demodulation of the RDS data from it is described below.
- PLL Phased Locked Loop
- the RDS signal is fed to a biphase symbol decoder 16, which converts the biphase signals into differential coded data. This is done, for example, by clock-controlled upward and downward integration with subsequent signal shaping.
- These are fed to a data memory 22 controlled in the bit clock and buffered.
- the complete RDS data are then finally available at an output 24 of the data memory 22.
- the biphase symbols are made using a 1.1875 kHz PLL oscillator 26 performed a clock recovery, the system clock the differential decoder 18 and the biphase symbol decoder 16 are available stands.
- the arrangement is such that even in the absence an RDS signal or corresponding biphase symbols, that is for example, briefly interrupted reception or brief switching of the RDS radio receiver to another frequency, one Bit clock synchronization of the differential decoder 18 or the biphase symbol decoder 16 for at least a short period of time, which essentially is determined by the quality of the 1.1875 kHz PLL oscillator, preserved.
- the 1.1875 kHz PLL oscillator 18 is, in analogy to mechanical preservation of an impulse, for example for a short time Shutdown of a motor vehicle engine, also referred to as a "flywheel".
- the system clock is also at the output 28 of the first demodulation path 12 available.
- a second demodulation path 30 is provided, which is identical to the first demodulation path 12, so that on its structure and operation on the above explanations regarding of the first demodulation path 12. Also the additional connection corresponds to a data memory 122 with an output 124 the formation of the first demodulation path 12, but on Output 124 the RDS data of the AF are available.
- the second demodulation path 30 with the data memory 122 is that first demodulation path 12 connected in parallel and optionally with the 57 kHz bandpass filter 10 connectable, with either the first demodulation path 12 or the second demodulation path 30 with the 57 kHz bandpass filter 10 is connected. There is a corresponding control logic for this 32 provided.
- the switchover is carried out in such a way that the MPX signal 34 of the mother frequency is present at the 57 kHz bandpass filter 10, if the first demodulation path 12 with the 57 kHz bandpass filter 10 is connected, whereas on the 57 kHz bandpass filter 10 the MPX signal 36 of the AF is present when the second demodulation path 30 with the 57 kHz bandpass filter 10 is connected or vice versa.
- the first Demodulation path 12 maintain bit clock synchronization, if briefly switched to the AF and the second demodulation path 30 is. Conversely, this takes place in the same way in the second demodulation path 30, if this is activated several times to check the AF, if switched to the first demodulation path 30 between the test times becomes.
- Fig. Signal 41 shown in FIG. 2 for example, a control signal of the control logic 32, in state 38 the MPX signal 34 of the mother frequency on the 57 kHz bandpass filter is present and this with the first demodulation path 12 is connected, whereas in a second state 40 the MPX signal 36 the AF is applied to the 57 kHz bandpass filter 10 and this with the second Demodulation path 30 is connected.
- a demodulation / selection of the RDS data which is based on the mother frequency be broadcast.
- a switch to the AF for a first period in which at least synchronization to the bit clock in the second demodulation path, i.e. in the 1.1875 kHz PLL oscillator 26. This first period is for example 8 ms or less.
- a third period 46 is switched back to the mother frequency, but in second demodulation path 30 of the 1.1875 kHz PLL oscillator 26 the previous established bit clock synchronization maintained.
- a fourth Period 48 again switches to AF for one second period of time, this due to the already existing bit clock synchronization in the second demodulation path 30 for reading out or regeneration of RDS data.
- the second period is, for example 8 ms or less.
- the fifth period 50 is back to the mother frequency switched back. Because the dwell on the AF for the selection of all relevant data is too short, the jump will be according to the time span 48 repeated until all desired RDS data are read out and Demodulated or selected, which allow a check whether the considered AF is a valid and receivable AF for the mother frequency is or not. It follows clearly from the preceding, that for the AF test only a one-time synchronization effort regarding of the RDS data stream on the AF is required.
- the RDS data are in blocks of a few bits Length collected and assembled into a complete data stream, switching to AF briefly at predetermined times becomes.
- To collect the RDS data transmitted on the AF successively is only synchronized to the bit clock during the first switchover.
- the dwell time on the AF is only a few milliseconds long, can do this bit clock synchronization, but not collecting the first bits are performed.
- Synchronization by means of the "flywheel" explained above received so that the next time this AF is started Is available and instantly in a short time window, for example 8 ms more RDS data is read out and buffered can be.
- the reading of all desired data of the RDS data stream can take up to a few 100 ms and is from quality inspection decoupled. That is why there are so many jumps to AF and data so often read until all data regarding the PI code is completely in the buffer are included. Thereupon this data becomes complete PI code assembled and sent for further processing.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
- Fig. 1
- ein Blockschaltbild einer bevorzugten Ausführungsform eines erfindungsgemäßen Demodulators und
- Fig. 2
- eine graphische Darstellung eines Steuersignals
Claims (10)
- Demodulator (100) für ein Multiplexsignal (MPX-Signal) eines RDS-(Radio-Daten-System)-Rundfunkempfängers, welches zumindest ein Stereosignal, ein Radio-Daten-System-Signal (RDS-Signal) und ggf. ein Verkehrsfunk-Signal (VF-Signal) enthält, wobei der Demodulator (100) zum Herausfiltern des RDS-Signals und des VF-Signals ein Eingangsbandpassfilter (10) aufweist, welchem ein erster Demodulationspfad (12) zum Selektieren von RDS-Daten aus dem RDS-Signal nachgeordnet ist,
dadurch gekennzeichnet, dass
ein zweiter Demodulationspfad (30) vorgesehen ist, welcher dem ersten Demodulationspfad (12) derart parallel geschaltet ist, dass wahlweise der erste oder zweite Demodulationspfad (12,30) mit dem Eingangsbandpassfilter (10) verbindbar ist, wobei der zweite Demodulationspfad (30) ebenfalls eine Taktrückgewinnungseinrichtung (26) und/oder eine Synchronisationseinrichtung umfasst, welche aus den RDS-Daten einen Systemtakt erzeugt und auch ohne RDS-Signal den Systemtakt über eine vorbestimmte Zeitspanne aufrecht erhält. - Demodulator (100) nach Anspruch 1,
dadurch gekennzeichnet, dass
der erste und/oder zweite Demodulationspfad (12,30) vom Eingangsbandpassfilter (10) ausgehend in Datenstromrichtung folgendes aufweist, eine Mischereinrichtung (14), welche eine Inphase- und eine Quadraturkomponente aus dem MPX-Signal (34,36) abtrennt, einen Biphasendekoder (16) und einen Differentialdekoder (18), wobei die beiden letzteren Dekoder (16,18) zusammen die RDS-Daten demodulieren. - Demodulator (100) nach Anspruch 2,
dadurch gekennzeichnet, dass
die Mischereinrichtung (14) einen Costas-Demodulator mit 57-kHz-PLL-Oszillator-Trägeraufbereitung umfasst. - Demodulator (100) nach Anspruch 2 oder 3,
dadurch gekennzeichnet, dass
der erste Demodulationspfad (12) eine Taktrückgewinnungseinrichtung (26) umfasst, welche aus den RDS-Daten einen Systemtakt erzeugt. - Demodulator (100) nach Anspruch 5,
dadurch gekennzeichnet, dass
die Taktrückgewinnungseinrichtung (26) einen 1,1875-kHz-PLL-Oszillator umfasst. - Demodulator (100) nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Zeitspanne, während der der zweite Demodulationspfad (30) mit dem Eingangsbandpassfilter (10) verbunden ist, 8 ms oder weniger beträgt. - Demodulator (100) nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
dem ersten und/oder dem zweiten Demodulationspfad (12,30) zum Zwischenspeichern von erfassten RDS-Daten bzw. erfassten RDS-Daten-Fragmenten eine im Bittakt der einlaufenden Informationen gesteuerte Speichereinrichtung (22,122) nachgeschaltet ist. - Demodulator (100) nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Taktrückgewinnungseinrichtung (26) des zweiten Demodulationspfades (30) einen 1,1875-kHz-PLL-Oszillator umfasst. - Verfahren zum Selektieren von RDS-Daten einer zu prüfenden Alternativfrequenz für eine an einem RDS-Rundfunkempfänger abgestimmte Mutterfrequenz,
dadurch gekennzeichnet, dass
für eine Bittakt-Synchronisation auf einen RDS-Datenstrom auf der Alternativfrequenz auf die der RDS-Rundfunkempfänger kurzzeitig abgestimmt wird, wobei nachfolgend der RDS-Rundfunkempfänger zu vorbestimmten Zeitpunkten zum Auslesen von RDS-Daten oder RDS-Daten-Fragmenten kurzzeitig auf die Alternativfrequenz abgestimmt wird, wobei ferner nach dem Umschalten auf die Alternativfrequenz zur Bittakt-Synchronisation diese derart aufrecht erhalten wird, dass sie bei den nachfolgenden Umschaltungen auf die Alternativfrequenz zum Auslesen von RDS-Daten noch wirksam ist. - Verfahren nach Anspruch 9,
dadurch gekennzeichnet, dass
eine nachfolgende Verweildauer auf der Alternativfrequenz zum Auslesen von RDS-Daten 8 ms oder weniger beträgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998147019 DE19847019A1 (de) | 1998-10-13 | 1998-10-13 | Demodulator für ein Multiplexsignal eines RDS-Rundfunkempfängers |
DE19847019 | 1998-10-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0994588A2 true EP0994588A2 (de) | 2000-04-19 |
EP0994588A3 EP0994588A3 (de) | 2004-04-28 |
Family
ID=7884227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99114653A Withdrawn EP0994588A3 (de) | 1998-10-13 | 1999-07-27 | Vorrichtung in einem zum Empfang von Radio-Daten geeigneten Rundfunkempfänger für die Demodulation eines Multiplexsignals |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0994588A3 (de) |
DE (1) | DE19847019A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1241812A1 (de) * | 2001-03-15 | 2002-09-18 | Siemens Aktiengesellschaft | Verfahren zur Bestimmung eines RDS-Codes mit einem Rundfunkempfänger |
CN103684341A (zh) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | 性能优越的滤波解调器 |
CN103684342A (zh) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | 对多路信号的进行滤波解调的装置 |
US8841964B2 (en) | 2010-03-10 | 2014-09-23 | Zurich Instruments Ag | Apparatus and method for demodulating an input signal |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10111590B4 (de) * | 2001-03-10 | 2004-05-06 | Harman Becker Automotive Systems (Becker Division) Gmbh | Verfahren und Schaltungsanordnung zur Demodulation des RDS-Signals |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0497116A2 (de) * | 1991-02-01 | 1992-08-05 | HENZE, Werner | RDS-Rundfunkempfänger |
US5222254A (en) * | 1990-03-09 | 1993-06-22 | U.S. Philips Corporation | Receiver including means for acquisition and comparison of identification data of two transmission channels |
DE19701042A1 (de) * | 1997-01-15 | 1998-07-16 | Bosch Gmbh Robert | Verfahren zur Auswertung von digitalen Signalen |
-
1998
- 1998-10-13 DE DE1998147019 patent/DE19847019A1/de not_active Withdrawn
-
1999
- 1999-07-27 EP EP99114653A patent/EP0994588A3/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5222254A (en) * | 1990-03-09 | 1993-06-22 | U.S. Philips Corporation | Receiver including means for acquisition and comparison of identification data of two transmission channels |
EP0497116A2 (de) * | 1991-02-01 | 1992-08-05 | HENZE, Werner | RDS-Rundfunkempfänger |
DE19701042A1 (de) * | 1997-01-15 | 1998-07-16 | Bosch Gmbh Robert | Verfahren zur Auswertung von digitalen Signalen |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1241812A1 (de) * | 2001-03-15 | 2002-09-18 | Siemens Aktiengesellschaft | Verfahren zur Bestimmung eines RDS-Codes mit einem Rundfunkempfänger |
US8841964B2 (en) | 2010-03-10 | 2014-09-23 | Zurich Instruments Ag | Apparatus and method for demodulating an input signal |
CN103684341A (zh) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | 性能优越的滤波解调器 |
CN103684342A (zh) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | 对多路信号的进行滤波解调的装置 |
Also Published As
Publication number | Publication date |
---|---|
DE19847019A1 (de) | 2000-04-20 |
EP0994588A3 (de) | 2004-04-28 |
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