EP0902564B1 - Méthode d'évaluation des signaux numériques, en particulier des signaux de données radio - Google Patents

Méthode d'évaluation des signaux numériques, en particulier des signaux de données radio Download PDF

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Publication number
EP0902564B1
EP0902564B1 EP19980109271 EP98109271A EP0902564B1 EP 0902564 B1 EP0902564 B1 EP 0902564B1 EP 19980109271 EP19980109271 EP 19980109271 EP 98109271 A EP98109271 A EP 98109271A EP 0902564 B1 EP0902564 B1 EP 0902564B1
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EP
European Patent Office
Prior art keywords
frequency
bits
group
bit
receiver
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
Application number
EP19980109271
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German (de)
English (en)
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EP0902564A1 (fr
Inventor
Joachim Witzke
Dieter Bombka
Klaus-Erwin Groeger
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—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 is based on a method for evaluating digital signals, which are transmitted via a transmission frequency other than a transmission frequency set on a radio receiver, according to the preamble of the main claim.
  • radio receivers are known in which the program chain identifiers are used to find receivable transmission frequencies over which the same program as over the current transmission frequency is transmitted.
  • the receiving frequency of the radio receiver for the duration of the test of an alternative frequency i. H. to check their reception field strength and their associated program chain identifier PI switched to the alternative transmission frequency.
  • the resulting signal interruptions in the range of 20 to 30 msec. or 150 to 300 msec. make themselves felt in the form of crackling noises and information loss. It is therefore proposed to insert substitute signals into the signal gaps which are obtained from the audio signal section immediately preceding the interruption by buffering and thus to mask the signal interruptions.
  • EP-A-0 497 116 A2 discloses an RDS receiver in which data samples are taken from their radio data signal for testing the program identification code (PI) of an alternative transmission frequency by short-term transitions to the alternative transmission frequency stored PI are compared to the originally set transmission frequency. It can also be sampled data from different groups of the radio data signal of the alternative transmission frequency.
  • PI program identification code
  • the inventive method with the features of the main claim has over the known from DE-A-41 03 061 radio receiver has the advantage that is not audible due to the brevity of switching from the current to the test transmission frequency, the audio signal interruption during the switching.
  • the inventive method has the advantage that the switchover to the alternative frequency and from this back to the mother frequency is less time-critical and thus the phase locked loop for frequency switching must meet less stringent requirements.
  • the inventive method is described below with reference to a radio receiver for receiving information transmitted by the Radio Data System (RDS), but in principle also applicable to other digitally transmitted information that is transmitted in structured structured bit groups.
  • RDS Radio Data System
  • a pending on a receiving antenna 1 broadcast signal is forwarded to a receiving part 2, the means required for the reception and demodulation of broadcast signals, such as an antenna signal amplifier, an adjustable phase-locked loop (PLL) Tuning of the receiving part 2 to a certain transmission frequency, an intermediate frequency part and a demodulator for demodulating the received broadcast signal has.
  • the phase locked loop for switching the receiving part from a first to a second transmission frequency is controlled by a controller 5 explained in more detail later.
  • the controlled by the controller 5 mute circuit 6 is designed in the present case as a controllable switch whose output to a memory, in the simplest case a capacitor connected is. In this way, the coupling capacitors of the subsequent stages are held at interruption of the audio signal to the last applied value, so that cracking noises are effectively avoided as a result of transients on the coupling capacitors when opening and closing the switch.
  • the Mute circuit may be configured such that the audio signal is off in the context of an interruption after a predetermined time function and after the temporary frequency switching is displayed again. In this way, a suppression of unpleasant clicks is also possible.
  • the stereo multiplex signal is further supplied to the input of an RDS demodulator 3 connected to the controller 5 for demodulating the 57 kHz subcarrier of the stereo multiplex signal (MPX) modulated by the RDS signal.
  • the output of the RDS demodulator 3 is connected to a memory 4 for storing the bits of the RDS signal in turn, which in turn is connected to the controller 5.
  • the memory 4 comprises a result register for recording a resulting bit group of the RDS signal, which can be fed to a further evaluation in the controller 5.
  • FIG. 2 shows, by way of example, a section of a radio data (RDS) signal 20 which is transmitted by a broadcast program via a transmission frequency.
  • the RDS signal 20 is composed of bit groups 21, 22, 23, hereinafter referred to as groups, as the largest contiguous unit, each group having a length of 104 bits.
  • Each group of the RDS signal is in turn divided into blocks 25, 26, 27, 28 of 26 bits each.
  • Each block consists of an information word comprising the first 16 bits, the actual information to be transmitted and an overlay 35, 36, 37, 38 of a control word formed from the information word and an offset word indicating the position of the respective block within the group.
  • the program chain identifier (PI) 40 in block A 25 of each group takes the first 16 bits each, the traffic identification (TP) 41 in block B 26 the sixth bit and the program type identifier (PTY) 42 in block B 26 the bit positions 7 to 11 on.
  • the present invention now makes use of the fact that the particularly important information, and these are to be detected by the method according to the invention, are transmitted at fixed positions within the groups of the digital signal, in the present case the RDS signal.
  • the relevant data of a currently set transmission frequency, hereinafter also called mother frequency (MF), alternative transmission frequency (AF) are now not collected in a continuous stream. Rather, the set mother frequency (MF) is only in the range of a few msec for a very short time. and set an alternative frequency to make the interruption in receiving the mother frequency inaudible to a listener.
  • MF is only in the range of a few msec for a very short time.
  • an alternative frequency to make the interruption in receiving the mother frequency inaudible to a listener.
  • a short bit sample is taken from the data stream 20 transmitted via the alternative frequency.
  • the mother frequency is set again and taken again after an interval time a data sample.
  • a data sample should not exceed 5 to 8 bits.
  • a suitable choice of the residence time T V on the alternative frequency for taking a data sample at a fixed interval time T I ensures that for each data sample, the successive BitPositionen within the jumped groups of the alternative frequency are detected.
  • the information content of the thus detected group is thus low, a Group or block synchronization is therefore just as impossible as a Syndrombetician.
  • FIG. 3 shows by way of example a detail of an RDS signal 20 which is transmitted via an alternative frequency 19.
  • the receiving frequency of the receiving part is or is at successive times t i , which are designated in the figure by the reference numerals 56, 57, 58, 59 and 60, switched from the mother frequency 18 to the alternative frequency 19. From the points of time t l, which in the present example, the switching times t coincide i, data samples 65, 66, 67, 68 taken from 20 of the Alternative Frequency 19-72 from the RDS signal and latched the functioning according to the inventive method, the radio receiver in the memory 4 ,
  • the data samples 65 to 72 according to FIG. 3 comprise 65: bit 25, block A - bit 6, block B; Group 1, 66: bit 7, block B - bit 15, block B; Group 2, 67: bit 16, block B - bit 24, block B; Group 3, ... 72: Bit 16, Block A - Bit 24, Block A, Group 13.
  • T tot O ⁇ ( ( p - 1 ) ⁇ T I + T V ) ,
  • the switching times ti from the mother frequency 18 to the alternative frequency 19 with respect to the reading times t l by at least the settling time of the PLL, which is indicated in Figure 3 by the reference numeral 51, vorzuverlegen.
  • the frequency switching is advanced from the mother frequency 18 to the alternative frequency 19 with respect to the times t l by a flat assumed transient time T E.
  • the flat-rate settling time of the PLL corresponds to the maximum settling time, which results in a frequency hopping over the largest possible frequency range, ie between two lying at the opposite ends of the FM frequency band transmission frequencies. If the switching times t i are advanced by this maximum settling time T E , the PLL is already set to the alternative frequency 19 for smaller than the maximum frequency jumps before the corresponding read time t 1 . In order to ensure that the data sample is read in at the time t 1 in this situation, it is also necessary to monitor the achievement of the times t 1 .
  • the settling time T E which, as already indicated, is dependent on the width of the skipped frequency range, is calculated from the difference of the values of the parent and the alternative frequency, and the switching times t i compared to the reading times t 1 are advanced by this individually calculated settling time T E of the PLL. This ensures that the PLL has timed to the alternative frequency in time for the beginning of a data sample acquisition and at the same time reaches the interruption 53 when receiving the mother frequency their smallest possible value.
  • FIGS. 4a, b each show an example of the content of the resulting memory contents or of the result register.
  • the content of the result register which has a length of 104 bits like the intermediate registers, results in the present case by adding the contents of the intermediate register contents, in this case the value o, ie the number of bit groups to be evaluated and thus also the number of intermediate registers in the Memory 4 to four was chosen.
  • the logic 1 value of the digital signal has been mapped to the value "1" and the logical value "0" has been mapped to the value "0".
  • FIG. 4 b shows the content of the result register in the event that all data samples have been taken from groups of the same type.
  • the other data of the group which have different information contents for different group types, are also usable.
  • intermediate values 80, 81 and 82 which result, for example, from errors in the transmission of the digital signal, are also shown in FIG. 4b.
  • the decision as to whether individual bit values are to be regarded as extreme values or as outliers from the statistical mean is, for example, B. by combinatorial consideration of the respective value and the frequency of deviations from the extremes in the environment of the considered value possible.
  • FIGS. 5 a and b show the sequence of the method according to the invention, which is implemented, for example, in the form of software in the controller 5 of a radio receiver according to the invention.
  • the process begins with step 100.
  • step 110 the RDS demodulator 3 of the radio receiver according to the invention is synchronized to the digital signal of the alternative frequency.
  • the receiving part 2 is tuned by means of the PLL of the mother frequency to the alternative frequency, in step 113, the detection of a bit is checked, after detection of a bit beginning in step 114, the time of the detected Bitsweepings stored as the basis for the calculation of the other switching times t i and the times t l for the removal of the data samples and finally in a step 115, the receiving part 2 is tuned by means of the PLL from the alternative frequency back to the mother frequency.
  • step 120 after bit synchronization of the RDS demodulator, along with further calculations, the dwell time T V on the alternative frequency is obtained from the quantities m and p, the next read time t l from the group duration T G and the values n, m, p, the next Switching time ti calculated from the mother frequency to the alternative frequency taking into account the settling time T E of the PLL.
  • the receiving part 2 of the radio receiver is tuned in block 140 from the mother frequency to the alternative frequency.
  • step 160 if, as checked in block 150, the read time t 1 calculated in block 120 is reached, one bit is read, in step 170 it is checked whether the dwell time T V on the alternative frequency has already elapsed, and if so is not the case, the next bit of the digital signal is read in step 160. If, according to the check in step 170, the dwell time T V has expired on the alternative frequency, ie if all the bits of the current data sample have been detected, in step 180 the receiver 2 of the radio receiver is tuned back to the mother frequency by the alternative frequency. Subsequently, in step 190 it is checked whether sufficient data samples are already available for an evaluation, ie whether a limit oxm has been reached.
  • the method is calculated with the step 120, ie the calculation of a new dwell time T V the next reading time t i for taking the next data sample. Is, however, the reached the aforementioned barrier, so all the intermediate registers of the memory 4 are occupied with newly detected data, so in step 200, the evaluation in such a way that, as in the example of Figures 4a and 4b, the contents of the intermediate registers added, the result register contents supplied to a threshold decision and the data taken from the Schwell Hugheser useful for further processing, for. B. the PI evaluation are supplied.
  • the method finally ends in step 210.
  • an evaluation of the read signal sections can also be such that the new data is collected in a second register, linked to the contents of the first register and then the result is written back into the same register.

Claims (4)

  1. Procédé exploitation de signaux numériques (20), en particulier de signaux de données radio transmis en groupes de bits (21, 22, 23) d'une longueur prédéterminée (52) à côté d'un programme de radiodiffusion sur une autre fréquence d'émission (19) que la fréquence d'émission (18) actuellement réglée sur un récepteur, la fréquence de réception du récepteur étant provisoirement commutée de manière répétée de la fréquence (18) initialement réglée à l'autre fréquence (19), les bits du signal numérique (20) transmis par l'autre fréquence (19) reçus sur l'autre fréquence (19) pendant la désactivation (50) du récepteur étant lus et retransmis en différé,
    caractérisé en ce qu'
    on effectue les commutations provisoires répétées (56, 57, 58, 59, 60) à des intervalles de temps (54) correspondant à un multiple entier de la longueur de groupes (52), ce à quoi on ajoute la durée de désactivation (50) sur l'autre fréquence (19),
    on répète les commutations provisoires (56, 57, 58, 59, 60) jusqu'à ce qu'un multiple entier (o) de groupes de bits soit retransmis en différé,
    on exploite les bits du signal numérique (20) lus pendant les commutations provisoires (56, 57, 58, 59, 60) dans un cycle d'exploitation (200), et
    on forme les bits d'un groupe de bits obtenu prévu pour l'évaluation en calculant de la moyenne des bits des groupes de bits retransmis en différé.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on exploite seulement des blocs du groupe de bits obtenu dont les bits sont reçus sous une forme identique et répétée en raison du calcul de la moyenne et sont donc identifiés de manière fiable.
  3. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    pendant la commutation du récepteur sur l'autre fréquence d'émission (19), on interrompt la reproduction d'un programme reçu.
    la reproduction d'un programme reçu est interrompue.
  4. Récepteur radio pour l'exploitation de signaux numériques transmis en groupes de bits (21, 22, 23) d'une longueur prédéterminée (52) à côté d'un programme de radiodiffusion sur une autre fréquence d'émission (19) que la fréquence d'émission actuellement réglée (18) sur un élément récepteur (2) du dispositif, avec une commande (5) qui commute provisoirement de manière répétée la fréquence de réception de l'élément récepteur (2) de la fréquence (18) initialement réglée à l'autre fréquence (19), et avec une mémoire (4) pour la retransmission différée des bits du signal numérique (20) transmis par l'autre fréquence (19), et reçus sur l'autre fréquence (19) pendant la désactivation (50) de l'élément récepteur,
    caractérisé par
    une conception de la commande (5) telle que les commutations provisoires répétées (56, 57, 58, 59, 60) se produisent à des intervalles de temps (54) qui correspondent à un multiple entier de la longueur de groupes (52), ce à quoi s'ajoute la durée de désactivation (50) sur l'autre fréquence (19),
    les commutations provisoires (56, 57, 58, 59, 60) sont répétées jusqu'à ce qu'un multiple entier (o) de groupes de bits soit retransmis en différé, les bits du signal numérique (20) lus pendant les commutations provisoires (56, 57, 58, 59, 60) sont exploités dans un cycle d'exploitation (200), et
    les bits d'un groupe de bits obtenu prévu pour l'évaluation sont formés en calculant la moyenne des bits des groupes de bits retransmis en différé.
EP19980109271 1997-09-09 1998-05-22 Méthode d'évaluation des signaux numériques, en particulier des signaux de données radio Expired - Lifetime EP0902564B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997139396 DE19739396A1 (de) 1997-09-09 1997-09-09 Verfahren zur Auswertung von digitalen Signalen
DE19739396 1997-09-09

Publications (2)

Publication Number Publication Date
EP0902564A1 EP0902564A1 (fr) 1999-03-17
EP0902564B1 true EP0902564B1 (fr) 2006-07-26

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EP (1) EP0902564B1 (fr)
JP (1) JPH11177448A (fr)
DE (2) DE19739396A1 (fr)
PL (1) PL328396A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10004002A1 (de) 2000-01-29 2001-08-09 Bosch Gmbh Robert Verfahren zum Verdecken von Unterbrechnungen der Wiedergabe empfangener Rundfunksignale
US7864893B2 (en) * 2007-07-25 2011-01-04 Silicon Laboratories, Inc. Decoder with soft decision combining
US8213546B2 (en) 2007-11-13 2012-07-03 Silicon Laboratories Inc. System and method for decoding RDS/RBDS data
US8126091B2 (en) 2008-09-30 2012-02-28 Silicon Laboratories Inc. RDS/RBDS decoder with reliable values

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103061C2 (de) * 1991-02-01 1995-04-13 Blaupunkt Werke Gmbh Rundfunkempfänger
DE4103062C2 (de) * 1991-02-01 1994-03-31 Blaupunkt Werke Gmbh Rundfunkempfänger
DE4441789C1 (de) * 1994-11-24 1995-11-23 Becker Gmbh Verfahren zur Erkennung von Daten in einem, insbesondere gestörten, RDS-Signal

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Publication number Publication date
DE19739396A1 (de) 1999-03-11
EP0902564A1 (fr) 1999-03-17
PL328396A1 (en) 1999-03-15
DE59813658D1 (de) 2006-09-07
JPH11177448A (ja) 1999-07-02

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