EP0587655A1 - Process for processing and reproducing received, digitally coded audio data and radio receiver for digital audio broadcast data (dab). - Google Patents

Process for processing and reproducing received, digitally coded audio data and radio receiver for digital audio broadcast data (dab).

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Publication number
EP0587655A1
EP0587655A1 EP92911319A EP92911319A EP0587655A1 EP 0587655 A1 EP0587655 A1 EP 0587655A1 EP 92911319 A EP92911319 A EP 92911319A EP 92911319 A EP92911319 A EP 92911319A EP 0587655 A1 EP0587655 A1 EP 0587655A1
Authority
EP
European Patent Office
Prior art keywords
reception
quality
dab
error rate
transmission
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.)
Granted
Application number
EP92911319A
Other languages
German (de)
French (fr)
Other versions
EP0587655B1 (en
Inventor
Ernst F Schroeder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
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Deutsche Thomson Brandt GmbH
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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
    • H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/12—Arrangements for observation, testing or troubleshooting
    • 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
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • DAB digital audio broadcasting
  • DVB digital audio broadcasting
  • the problem of not switching to another transmitter in time can generally be e.g. be solved with the aid of RDS, but not in the event of a brief loss of reception, as can happen when driving under bridges or the like.
  • the reception quality of VHF-FM is worse at the edge of a transmitter's coverage area, but much better in terms of reception behavior, because the transition from very good reception to unworthiness of reception takes place in a range of the reception voltage of up to 30 dB, that is fluent from good to bad even over long distances.
  • the proposal is sometimes made in digital transmission systems to achieve a so-called sliding deterioration in reproduction - also called “graceful degradation”.
  • the object of the invention is to avoid an abrupt termination of the reception or the audio reproduction with simple means with a decreasing reception field strength and worsening reception conditions
  • the invention is based on the object of designing a radio receiver in such a way that the aforementioned disadvantages do not arise when receiving digitally coded audio signals.
  • the object is achieved with a method for ver; work and playback of digitally encoded audio data, which has the features of claim 1, solved.
  • Advantageous further developments of the method are described in subclaims 2 to 6 and can be found in the following description.
  • the invention is based on the following consideration: using suitable means, for example a bit error rate measuring device, measure the reception quality, for example the bit error rate, of the received audio data.
  • the measured error rate or bit error rate or reception quality is a criterion for the transmission quality of the transmitter .
  • communication channel or the received audio data for example the quality is the reciprocal of the error rate.
  • a threshold value for the error rate (or quality of transmission) is set which is still below (above) the error rate (or quality) at which the abrupt termination of the reproduction or of reception or transmission occurs.
  • the user can easily perceive a change in at least one reproduction parameter or the reproduction quality. This can _ ⁇ . -
  • the limit frequency or limitation of the low-pass filter preferably being reduced variably or smoothly when the preset threshold value of the error rate is exceeded, and perceptibly changes the playback frequency spectrum. If the measured error rate is below the threshold value, the low-pass filter has no changing influence on the reproduction.
  • the user is made aware of an expected abrupt termination of the reception in good time.
  • the intended deterioration in reproduction corresponds to what a listener is used to from FM radio reception, such as the increased noise when driving under bridges, when driving through tunnels or at the edge of a signal propagation area, etc. .
  • the threshold value can be set variably. This is particularly advantageous in the case of mobile radio reception, if the threshold value is changed as a function of the driving speed, since at high speeds even a medium type of error can still mean good reception or reproduction quality.
  • the error rate or the derived quality criterion is preferably subjected to low-pass filtering, so that the artificial change to the reproduction device takes place more on the basis of the average channel quality.
  • the low-pass filter can also have different time constants for rise and / or fall.
  • the figure shows a DAB mobile receiver 1 with a receiving antenna 2, an HF IF part 3 connected to it, an IF signal processor 4a, an A / D converter 4b integrated therein, a DAB source decoder 5, an audio Signal processor 6, an LF amplification stage 7a with a D / A converter 7b contained therein, a loudspeaker 8 and a microprocessor 9 which includes a measuring device 9a (BER - bit ERROR rate) for determining the bit error rate of a digital signal ⁇ holds.
  • a measuring device 9a BER - bit ERROR rate
  • the DAB-specific digital signal processing is performed according to the figure by the IF signal processor 4a, DAB source decoder 5 and audio signal processor 6, these circuit parts being regularly designed as highly integrated circuits.
  • the audio signal processor 6 takes over the audio functions implemented in today's receiver concepts in analog circuit technology, such as influencing the sound, volume, cross-fader, balance, etc.
  • the IF signal processor 4a serves to extract from the signal which is generated by the HF / IF part 3 constructed using conventional technology is used to extract the data stream contained therein.
  • the microprocessor 9 is used to control the receiver, to which a value for the travel speed is fed via an input 10, to which the entire data stream or a part thereof is fed via an input 11, to which a 12 data are supplied from the source decoder, and input values from an operating device (not shown) are supplied via further inputs 13 and 14.
  • the microprocessor is connected to a control input 17 of the audio signal processor 6 via an output 15 and a control line 16.
  • the microprocessor contains a bit error rate measuring device 9a, which determines the error rate of the received signals from the data stream supplied via input 11.
  • a threshold value for the error rate is stored in the microprocessor and is changed as a function of the travel speed. The current error rate or the threshold value or a difference between the two values can be shown continuously on a display.
  • the audio signal processor is controlled in such a way that noise is added to the LF signal to be amplified which is clearly perceptible to the listener is. If the reception stops abruptly, only a noise or an identification signal (either continuously or occasionally), which is generated by the audio signal processor, can be heard by the loudspeaker 8.
  • the perceptible artificial change in the audio signal increases smoothly or in stages, in each case depending on how far the threshold value of the error rate is exceeded.
  • the measured value of the error rate in the microprocessor is subjected to low-pass filtering, so that the artificial change takes place more on the basis of the average channel quality.
  • the low pass has different and / or variable time constants for rise and fall. As the speed of travel increases, the threshold value is changed, preferably raised.
  • various switchovers of the HF / IF part 3 are also carried out by the microprocessor 9 via a control line 18. If the error rate jumps from a value below the set error rate threshold (i.e. good fang) to a value far above the threshold (abrupt termination of reception), as described above, only a noise or identification signal is given to the outputs of the signal processor.
  • a value below the set error rate threshold i.e. good fang
  • a reception frequency with a station of the same or another program worth receiving which the HF / IF Part 3 is re-tuned after the abrupt reception abort. This ensures that even after the reception has been aborted, if no data can be received via other transmitters, the radio receiver automatically switches to a receiver that is worth receiving, preferably of the same program.
  • a slow and smooth rise in the error rate is a sign that the range of a transmitter is being left, e.g. when driving, a sudden increase in the error rate means going under or through a bridge or tunnel, etc., the HF / IF part 3 remains tuned to the same transmitter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

Un procédé sert à traiter et à reproduire à la réception des données audio codées numériquement et un poste récepteur radio permet de recevoir des données radio codées numériquement (DAB). Dans le cas de moyens de transmission numériques, par exemple la radiodiffusion numérique (DAB), la réception est abruptement interrompue à la limite de la zone de propagation du moyen de transmission, c'est-à-dire lorsque le canal de transmission parvient aux limites de sa capacité. Il est proposé, dans le cas de systèmes de transmission numérique, d'obtenir une dégradation progressive de la reproduction (graceful degradation). Selon l'invention, une dégradation progressive artificielle est obtenue par la modification artificielle du signal de reproduction en fonction de la qualité de transmission ou de réception lorsqu'une valeur limite réglée de la qualité de transmission ou de réception n'est pas atteinte. L'invention est utile dans des postes récepteurs radio numériques, notamment des postes DAB.A method is used to process and reproduce digitally encoded audio data upon reception, and a radio receiver is used to receive digitally encoded radio data (DAB). In the case of digital transmission media, for example digital broadcasting (DAB), reception is abruptly interrupted at the limit of the propagation area of the transmission medium, i.e. when the transmission channel reaches the limits of its capacity. It is proposed, in the case of digital transmission systems, to obtain a gradual degradation of reproduction (graceful degradation). According to the invention, an artificial progressive degradation is obtained by the artificial modification of the reproduction signal depending on the transmission or reception quality when a set limit value of the transmission or reception quality is not reached. The invention is useful in digital radio receivers, especially DAB sets.

Description

Verfahren zur Verarbeitung und Wiedergabe empfangener digi¬ tal codierter Audio-Daten und Rundfunkemempfänger zum Emp¬ fang von digital codierten Ton-Rundfunkdaten (DAB) Process for processing and reproducing received digitally coded audio data and radio receivers for receiving digitally coded sound radio data (DAB)
Bei digitalen Übertragungsmedien, z.B. digitalen Ton- Rundfunk (DAB, "DAB" ist ein Warenzeichen der TELEFUNKEN Fernseh und Rundfunk GmbH), kommt es am Rande eines Ausbrei¬ tungsgebietes, d.h. wenn der Übertragungskanal an die Grenze seiner Leistungsfähigkeit kommt, zum abrupten Abbrechen des Empfangs. Dies geschieht insbesondere auch dann, wenn ein leistungsfähiger Code zur Fehlerkorrektur verwendet wird. Ein Übergang von sehr guten Empfang zur gar keinem Empfang kann dabei innerhalb von 1 db Verminderung der Empfangsspan¬ nung erfolgen.With digital transmission media, e.g. digital audio broadcasting (DAB, "DAB" is a trademark of TELEFUNKEN Fernseh und Rundfunk GmbH), it occurs on the edge of an expansion area, i.e. when the transmission channel reaches the limit of its performance, abruptly aborting the reception. This is particularly the case when a powerful error correction code is used. A transition from very good reception to no reception at all can take place within a 1 dB reduction in the reception voltage.
Dieses Verhalten ist unerwünscht, da der Benutzer nicht rechtzeitig vorgewarnt wird, auf einen anderen Sender zu schalten. Im Gegenteil, er wird sogar fälschlicherweise ver¬ muten, daß sein Empfangsgerät bei Ausfall der Wiedergabe ei¬ ne Störung oder -einen Defekt aufweist, wie z.B. zerstörtes IC, Wackelkontakt, Lautsprecherausfall oder dgl..This behavior is undesirable because the user is not warned in good time to switch to another transmitter. On the contrary, he will even erroneously suspect that his receiving device has a malfunction or defect, e.g. destroyed IC, loose contact, speaker failure or the like ..
Zwar kann das Problem des nicht rechtzeitigen Umschaltens auf einen anderen Sender generell z.B. mit Hilfe von RDS ge¬ löst werden, aber nicht bei kurzzeitigen Ausfall des Emp¬ fangs, wie es beim Unterfahren von Brücken oder ähnlichem passieren kann.The problem of not switching to another transmitter in time can generally be e.g. be solved with the aid of RDS, but not in the event of a brief loss of reception, as can happen when driving under bridges or the like.
Die Empfangsqualität von UKW-FM ist am Rande eines Ausbrei¬ tungsgebietes eines Senders zwar schlechter, vom Empfangsver¬ halten her jedoch deutlich besser, denn der Übergang von sehr gutem Empfang zur Empfangsunwürdigkeit vollzieht sich in einem Bereich der EmpfangsSpannung von bis zu 30 dB, also auch über größere Entfernungen fließend von gut nach schlecht. Verschi dentlich wird bei digitalen UbertragungsSystemen der Vorschlag gemacht, eine sogenannte gleitende Wiedergabever¬ schlechterung - auch "Graceful Degradation" genannt - zu er¬ reichen. Aus dem Forumsbericht "Innovatives Europa", Be¬ richt, Frank Müller-Römer: "Digital Audio Broadcast" (DAB), Bonn-Bad Godesberg, 8. März 1990 ist die Problemstellung be¬ kannt, bei geringer werdender Empfangsfeldstärke und sich verschlechternden Empfangsbedingungen den DAB-Empfang nicht abrupt abbrechen zu lassen, sondern gleitend von Stereo auf Mono - ähnlich wie bei UKW-FM - umzuschalten. Bei der Stereo - Mono-Umschaltung ist unter ungünstigen Umständen davon aus¬ zugehen, daß der Hörer die Umschaltung gar nicht wahrnimmt, da die Hörbedingungen dafür nicht immer geeignet sind oder weil die gerade empfangene Sendung ohnehin in Mono ausge¬ strahlt .wird (z.B. Nachrichtensprecher).The reception quality of VHF-FM is worse at the edge of a transmitter's coverage area, but much better in terms of reception behavior, because the transition from very good reception to unworthiness of reception takes place in a range of the reception voltage of up to 30 dB, that is fluent from good to bad even over long distances. The proposal is sometimes made in digital transmission systems to achieve a so-called sliding deterioration in reproduction - also called "graceful degradation". The problem is known from the forum report "Innovative Europe", report, Frank Müller-Römer: "Digital Audio Broadcast" (DAB), Bonn-Bad Godesberg, March 8, 1990, with decreasing reception field strength and worsening reception conditions not to abruptly abort the DAB reception, but to switch smoothly from stereo to mono - similar to FM radio. In the case of stereo-mono switching, it can be assumed under unfavorable circumstances that the listener does not notice the switching at all, since the listening conditions are not always suitable for this or because the program just received is broadcast in mono anyway (for example news announcers ).
Außerdem ist das Thema der "Graceful Degradation" eines digi¬ talen Audio-Übertragungssystem aus J. Atidio Engineering Re¬ ports Soc, Vol. 36, No. 1/2, 1988 January/February bekannt. Dort wird der Vorteil der "Graceful Degradation" bei einer Audio-Wiedergabe beschrieben, wenn das Audio-Signal über Ka¬ näle mit einem großen Bereich der Bandbreite übertragen wird. Jedoch sind dort angegeben Maßnahmen nicht geeignet, eine einfache, kostengünstige und für den Hörer immer befrie¬ digende Lösung des beschriebenen Problems auszubilden, da u.a. für mehrere unterschiedlich wirksame Fehlerkorrekturver¬ fahren der Aufwand doch beträchtlich ist. Auch zeigt sich, daß zwar eine Verbreiterung des Überςrangsbereichs erreicht werden kann, dieser aber nur wenig mehr als einige dB aus¬ macht.In addition, the topic of "Graceful Degradation" of a digital audio transmission system from J. Atidio Engineering Reports Soc, Vol. 36, No. 1/2, 1988 January / February. The advantage of "graceful degradation" in audio playback is described there if the audio signal is transmitted over channels with a large range of bandwidth. However, the measures specified there are not suitable for developing a simple, inexpensive and always satisfying solution for the listener of the problem described, since among other things The effort is considerable for several differently effective error correction methods. It also shows that, although a broadening of the overriding range can be achieved, this only makes a little more than a few dB.
Da zudem bei digitalen Strecken und insbesondere mobilem Emp¬ fang die Qualität der Ubertragungsstrecke bzw. des Empfangs sich häufig stark ändert, ergibt sich eine stark schwankende "Graceful Degradation", die nicht dem mittleren Verhalten des Übertragungskanals entspricht. Aufgabe der Erfindung ist es, mit einfachen Mitteln bei ge¬ ringer werdender Empfangsfeldstärke und sich verschlechtern¬ den Empfangsbedingungen einen abrupten Abbruch des Empfangs bzw. der Audiowiedergabe zu vermeidenIn addition, since the quality of the transmission link or reception often changes greatly in the case of digital links and, in particular, mobile reception, there is a strongly fluctuating "graceful degradation" which does not correspond to the average behavior of the transmission channel. The object of the invention is to avoid an abrupt termination of the reception or the audio reproduction with simple means with a decreasing reception field strength and worsening reception conditions
Des weiteren liegt der Erfindung die Aufgabe zugrunde, einen Rundfunkempfänger so auszubilden, daß sich die vorgenannten Nachteilen beim Empfang digital codierter Audio-Signal nicht einstellen.Furthermore, the invention is based on the object of designing a radio receiver in such a way that the aforementioned disadvantages do not arise when receiving digitally coded audio signals.
Erfindungsgemäß wird die Aufgabe mit einem Verfahren zur Ver; arbeitung und Wiedergabe von digital codierten Audio-Daten, das die Merkmale nach Anspruch 1 aufweist, gelöst. Vorteil¬ hafte Weiterbildungen des Verfahrens sind in den Unteransprü¬ chen 2 bis 6 beschrieben, sowie der folgenden Beschreibung zu entnehmen.According to the invention the object is achieved with a method for ver; work and playback of digitally encoded audio data, which has the features of claim 1, solved. Advantageous further developments of the method are described in subclaims 2 to 6 and can be found in the following description.
Die weitere Aufgabe wird erfindungsgemäß mit einem Rundfunk¬ empfänger mit den Merkmalen nach Anspruch 7 gelöst.The further object is achieved according to the invention with a radio receiver with the features according to claim 7.
Die Erfindung geht von folgender Überlegung aus: Man messe mit geeigneten Mitteln, z.B. einer Bitfehlerraten-Meßeinrich¬ tung, die Empfangsgualität, z.B. die Bitfehlerrate, der emp¬ fangenen Audio-Daten. Die gemessene Fehlerrate bzw. Bitfeh¬ lerrate oder Empfangsgualität ist ein Kriterium für die Über¬ tragungsgüte des Übert.ragungskanals bzw. der empfangen Au¬ dio-Daten, z.B. sei die Güte der Kehrwert der Fehlerrate. Des weiteren lege man einen Schwellwert für die Fehlerrate (oder Übertragungsgüte) fest, der noch unterhalb (oberhalb) der Fehlerrate (oder Güte) liegt, bei der der abrupte Abruch der Wiedergabe bzw. des Empfangs oder der Übertragung ein¬ tritt.The invention is based on the following consideration: using suitable means, for example a bit error rate measuring device, measure the reception quality, for example the bit error rate, of the received audio data. The measured error rate or bit error rate or reception quality is a criterion for the transmission quality of the transmitter . communication channel or the received audio data, for example the quality is the reciprocal of the error rate. Furthermore, a threshold value for the error rate (or quality of transmission) is set which is still below (above) the error rate (or quality) at which the abrupt termination of the reproduction or of reception or transmission occurs.
Bei Überschreiten (Unterschreiten) des festgelegten Schwell¬ wertes der Fehlerrate (Übertragungsgüte) erfolgt eine für den Benutzer gut wahrnehmbare Änderung wenigstens eines Wie¬ dergabe-Parameters bzw. der Wiedergabegualität. Dies kann _ Δ. -If the specified threshold value of the error rate (transmission quality) is exceeded (falling below), the user can easily perceive a change in at least one reproduction parameter or the reproduction quality. This can _ Δ. -
bei der Wiedergabe z.B. in Form eines Zusetzen von Rauschen oder eines Kenntones zum Audio-Wiedergabesignal geschehen, aber auch durch eine Verminderung der Wiedergabelautstärkepe¬ gels, oder eine Verschiebung der Übertragungs-Grenzfreguenz zu tiefen Hör-Freguenzen erreicht werden. Lezteres wird da¬ durch erreicht, daß im Signalweg der Audio-Signale zu der Widergabeeinrichtung ein digitaler Tiefpaß angeordnet ist und aktiviert wird, wobei die Grenzfreguenz oder Begrenzung des Tiefpasses sich bei Überschreiten des voreingestellten Schwellwertes der Fehlerrate vorzugsweise variabel bzw. glei¬ tend verringert, und so das Wiedergabefreguenzspektrum wahr¬ nehmbar verändert. Liegt die gemessene Fehlerrate unterhalb des Schwellwertes, hat der Tiefpaß keinen veränderenden Ein¬ fluß auf die Wiedergabe.during playback e.g. in the form of adding noise or a characteristic tone to the audio playback signal, but also by reducing the playback volume level, or by shifting the transmission limit frequency to low listening frequencies. The latter is achieved by arranging and activating a digital low-pass filter in the signal path of the audio signals to the playback device, the limit frequency or limitation of the low-pass filter preferably being reduced variably or smoothly when the preset threshold value of the error rate is exceeded, and perceptibly changes the playback frequency spectrum. If the measured error rate is below the threshold value, the low-pass filter has no changing influence on the reproduction.
Es wird also eine künstliche "Graceful Degradation" durchge¬ führt, wobei das Wiedergabesignal in Abhängigkeit der Uber¬ tragungs- bzw. Empfangsgualität künstlich verändert wird, wenn ein eingestellter Schwellwert für die Übertragungs¬ bzw. Empfangsgualität oder -gute unterschritten wird.An artificial "graceful degradation" is thus carried out, the reproduction signal being artificially changed as a function of the transmission or reception quality if a set threshold value for the transmission or reception quality or quality is undershot.
Mit den vorstehend beschriebenen einfachen Maßnahmen wird der Benutzer auf ein zu erwartenden abruptes Abrechen des Empfanges rechtzeitig aufmerksam gemacht. Wird z.B. ein Rauschsignal dem Wiedergabesignal zugesetzt, entspricht die beabsichtigte Widergabeverschlechterung dem, was ein Hörer vom UKW-FM-Empfang ohnehin gewohnt ist, wie beispielsweise das vermehrte Rauschen bei Unterfahren von Brücken, beim Durchfahren von Tunnel oder am Rande eines Signal-Ausbrei¬ tungsgebietes usw..With the simple measures described above, the user is made aware of an expected abrupt termination of the reception in good time. E.g. If a noise signal is added to the reproduction signal, the intended deterioration in reproduction corresponds to what a listener is used to from FM radio reception, such as the increased noise when driving under bridges, when driving through tunnels or at the edge of a signal propagation area, etc. .
Es ist sinnvoll, daß der Schwellwert variabel eingestellt werden kann. Dieses insbesondere beim mobilen Rundfunkemp¬ fang vorteilhaft, wenn der Schwellwert in Abhängigkeit der Fahrtgeschwindigkeit verändert wird, da bei hoher Geschwin¬ digkeit auch eine mittlere Fehlerarte noch eine gute Emp¬ fangs- bzw. Widergabegualität bedeuten kann. Vorzugsweise wird die Fehlerrate oder das abgeleitete Güte¬ kriterium einer Tiefpassfilterung unterworfen, sodaß die künstliche Änderung an der Widergabeeinrichtung mehr auf der Basis des mittleren Kanalgualität erfolgt. Der Tiefpaß kann dabei auch unterschiedliche Zeitkonstanten für Anstieg und/oder Abfall aufweisen.It makes sense that the threshold value can be set variably. This is particularly advantageous in the case of mobile radio reception, if the threshold value is changed as a function of the driving speed, since at high speeds even a medium type of error can still mean good reception or reproduction quality. The error rate or the derived quality criterion is preferably subjected to low-pass filtering, so that the artificial change to the reproduction device takes place more on the basis of the average channel quality. The low-pass filter can also have different time constants for rise and / or fall.
Nachfolgend wird die Erfindung anhand eines möglichen in der Zeichnung dargestellten Ausführungsbeispiels näher erläu¬ tert.The invention is explained in more detail below on the basis of a possible exemplary embodiment shown in the drawing.
Die Figur zeigt einen DAB-Mobilempfänger 1 mit einer Emp¬ fangsantenne 2, einem damit verbundenden HF-ZF-Teil 3, einem ZF-Signalprozessor 4a, einen darin integrierten A/D-Wandler 4b, einem DAB-Quelldecoder 5, einem Audio-Signalprozessor 6, einer NF-Verstärkungsstufe 7a mit einem darin enthaltenen D/A-Wandler 7b, einen Lautsprecher 8 und einen Mikroprozes¬ sor 9, der eine Meßeinrichtung 9a (BER - Bit-ERROR-Rate) zur Ermittlung der Bitfehlerrate eines digitalen Signals ent¬ hält.The figure shows a DAB mobile receiver 1 with a receiving antenna 2, an HF IF part 3 connected to it, an IF signal processor 4a, an A / D converter 4b integrated therein, a DAB source decoder 5, an audio Signal processor 6, an LF amplification stage 7a with a D / A converter 7b contained therein, a loudspeaker 8 and a microprocessor 9 which includes a measuring device 9a (BER - bit ERROR rate) for determining the bit error rate of a digital signal ¬ holds.
Die DAB-spezifische digitale Signalverarbeitung wird entspre¬ chend der Figur vom ZF-Signalprozessor 4a, DAB-Ouelldecoder 5 und Audio-Signalprozessor 6 bewältigt, wobei diese Schal¬ tungsteile regelmäßig als hochintegrierte Schaltkreise ausge¬ bildet sind. Der Audio-Signalprozessor 6 übernimmt die in den heutigen Empfängerkonzepten in analoger Schaltungstech¬ nik realisierten Audio-Funktionen, wie Klangbeeinflussung, Lautstärke, Überblender, Balance usw.. Der ZF-Signalprozes¬ sor 4a dient dazu, aus dem Signal, welches von dem in konven¬ tioneller Technik aufgebauten HF/ZF-Teil 3 geliefert wird, den darin enthaltenen Daten-Strom zu extrahieren.The DAB-specific digital signal processing is performed according to the figure by the IF signal processor 4a, DAB source decoder 5 and audio signal processor 6, these circuit parts being regularly designed as highly integrated circuits. The audio signal processor 6 takes over the audio functions implemented in today's receiver concepts in analog circuit technology, such as influencing the sound, volume, cross-fader, balance, etc. The IF signal processor 4a serves to extract from the signal which is generated by the HF / IF part 3 constructed using conventional technology is used to extract the data stream contained therein.
Zur Steuerung des Empfängers dient der Mikroprozessor 9, dem über einen Eingang 10 ein Wert für die Fahrtgeschwindigkeit zugeführt wird, dem über einen Eingang 11 der gesamte Daten¬ strom oder ein Teil davon zugeführt wird, dem über einen Ein- gang 12 Daten vom Quelldecoder zugeführt werden, und über weitere Eingange 13 und 14 Eingabewerte von einer Bedienungs¬ einrichtung (nicht dargestellt) zugeführt werden. Über einen Ausgang 15 und eine Steuerleitung 16 ist der Mikroprozessor mit einem Steuereingang 17 des Audio-Signalprozessors 6 ver¬ bunden. Außerdem enthält der Mikroprozessor eine Bitfehlerra- ten eßeinrichtung 9a, die aus dem über den Eingang 11 zuge¬ führten Datenstrom die Fehlerrate der empfangen Signale er¬ mittelt. Im Mikroprozessor ist ein Schwellwert für die Feh¬ lerrate abgespeichert, der in Abhängigkeit der Fahrtgeschwin¬ digkeit geändert wird. Die aktuelle Fehlerrate bzw. der Schwellwert oder eine Differenz beider Werte kann an einer Anzeige ständig angezeigt werden.The microprocessor 9 is used to control the receiver, to which a value for the travel speed is fed via an input 10, to which the entire data stream or a part thereof is fed via an input 11, to which a 12 data are supplied from the source decoder, and input values from an operating device (not shown) are supplied via further inputs 13 and 14. The microprocessor is connected to a control input 17 of the audio signal processor 6 via an output 15 and a control line 16. In addition, the microprocessor contains a bit error rate measuring device 9a, which determines the error rate of the received signals from the data stream supplied via input 11. A threshold value for the error rate is stored in the microprocessor and is changed as a function of the travel speed. The current error rate or the threshold value or a difference between the two values can be shown continuously on a display.
.In Abhängkeit davon, ob die gemessene Fehlerrate den Schwell¬ wert der Fehlerrate übersteigt, wird- der Audio-Signalprozes¬ sor derartig gesteuert, daß ein Rauschen dem zu verstärken¬ den NF-Signal zugesetzt wird, das für den Hörer gut wahrnehm¬ bar ist. Bricht der Empfang abrupt ab, ist nur noch ein Rau¬ schen oder ein Kennsignal (entweder ständig oder gelegent¬ lich), welches vom Audio-Signal-Prozessor generiert wird, vom Lautsprecher 8 zu vernehmen. Die wahrnehmbare künstliche Veränderung des Audiosignals verstärkt sich gleitend oder stufig, jeweils abhängig davon, wie weit der Schwellwert der Fehlerrate überschritten wird. Dazu wird der gemessene Wert der Fehlerrate im Mikroprozessor einer Tiefpaßfilterung un¬ terworfen, sodaß die künstliche Änderung mehr auf Basis der mittleren Kanalgualität erfolgt. Der Tiefpaß weist unter¬ schiedliche und/oder variable Zeitkonstanten für Anstieg und Abfall auf. Bei steigender Fahrtgeschwindigkeit wird der Schwellwert verändert, vorzugsweise angehoben.Depending on whether the measured error rate exceeds the threshold value of the error rate, the audio signal processor is controlled in such a way that noise is added to the LF signal to be amplified which is clearly perceptible to the listener is. If the reception stops abruptly, only a noise or an identification signal (either continuously or occasionally), which is generated by the audio signal processor, can be heard by the loudspeaker 8. The perceptible artificial change in the audio signal increases smoothly or in stages, in each case depending on how far the threshold value of the error rate is exceeded. For this purpose, the measured value of the error rate in the microprocessor is subjected to low-pass filtering, so that the artificial change takes place more on the basis of the average channel quality. The low pass has different and / or variable time constants for rise and fall. As the speed of travel increases, the threshold value is changed, preferably raised.
In Abhängigkeit des Anstiegs der gemessenen Fehlerrate wer¬ den außerdem verschiedene Umschaltungen des HF/ZF-Teils 3 über eine Steuerleitung 18 vom Mikroprozessor 9 vorgenommen. Steigt die Fehlerrate sprunghaft von einem Wert unterhalb des eingestellten Fehlerraten-Schwellwertes (also gutem Emp- fang) auf einen Wert weit oberhalb des Schwellwertes (apru- pter Abrruch des Empfangs) wird wir vorstehend beschrieben lediglich ein Rausch- oder Kennsignal auf die Ausgänge des Signalprozessors gegeben.Depending on the increase in the measured error rate, various switchovers of the HF / IF part 3 are also carried out by the microprocessor 9 via a control line 18. If the error rate jumps from a value below the set error rate threshold (i.e. good fang) to a value far above the threshold (abrupt termination of reception), as described above, only a noise or identification signal is given to the outputs of the signal processor.
))
Verläuft der Anstieg der Fehlerrate jedoch langsam und glei¬ tend bis zum völligen Abbruch des Empfangs, wird bei Über¬ schreiten des Fehlerraten-Schwellwertes im Mikroprozessor eine Empfangsfreguenz mit einem empfangswürdigen Sender des gleichen oder eines anderen Programms ausgesucht, auf die der HF/ZF-Teil 3 nach dem abrupten Empfangsabruch neu abge¬ stimmt wird. Damit wird gewährleistet, daß auch nach dem Ab¬ bruch des Empfangs, wenn keine Daten über andere Sender mehr empfangen werden können, der Rundfunkempfänger automatisch auf einen empf ngswürdigen Sender vorzugsweise des gleichen Programms umschaltet. Ein langsames und gleitendes Ansteigen der Fehlerrate ist ein Zeichen dafür, daß das Ausbreitungsge¬ biet eines Senders verlassen wird, z.B. beim Fahren, ein sprunghafter Anstieg der Fehlerrate bedeutet das Unter- oder Durchfahren einer Brücke oder eines Tunnels etc., wobei der HF/ZF-Teil 3 auf den gleichen Sender abgestimmt bleibt. If, however, the error rate increases slowly and smoothly until reception is completely stopped, if the error rate threshold value is exceeded in the microprocessor, a reception frequency with a station of the same or another program worth receiving, which the HF / IF Part 3 is re-tuned after the abrupt reception abort. This ensures that even after the reception has been aborted, if no data can be received via other transmitters, the radio receiver automatically switches to a receiver that is worth receiving, preferably of the same program. A slow and smooth rise in the error rate is a sign that the range of a transmitter is being left, e.g. when driving, a sudden increase in the error rate means going under or through a bridge or tunnel, etc., the HF / IF part 3 remains tuned to the same transmitter.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zur Verarbeitung und/oder Wiedergabe von emp¬ fangenen digital codierten Audio-Daten, z.B. digitale Ton-Rundfunkdaten (DAB), wobei mit geeigneten Mitteln die Empfangs- bzw. Ubertragungsgualität, z.B. die Bit¬ fehlerrate, der Audio-Daten gemessen wird, wobei ein Schwellwert für die Güte der Empfangs-bzw. Übertragungs- gualitätgualität festgelegt wird, und beim Unterschrei¬ ten des Schwellwertes eine für den Benutzer wahrnehmba¬ re Änderung eines Wiedergabegualitätsparameters und/oder wahrnehmbare Anzeige erfolgt.1. Method for processing and / or reproducing received digitally coded audio data, e.g. digital audio broadcasting data (DAB), the reception or transmission quality, e.g. the bit error rate, the audio data is measured, a threshold value for the quality of the reception or. Transmission quality is determined, and when the threshold value is undershot, a change in a reproduction quality parameter and / or perceptible display takes place for the user.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei Unterschreiten der festgelegten Empfangsgualität dem Wiedergabesignal ein Rauschsignal und/oder Kennsi¬ gnal, z.B. Kennton, zugesetzt wird.2. The method according to claim 1, characterized in that when the specified reception quality falls below the playback signal, a noise signal and / or Kennsi¬ signal, e.g. Kennton is added.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei Unterschreiten der festgelegten Empfangsgualität das Wiedergabesignal tiefpaßgefiltert und/oder der Laut¬ stärkepegel des Wiedergabesignals vermindert wird.3. The method according to claim 1, characterized in that when the specified reception quality is undershot, the playback signal is low-pass filtered and / or the volume level of the playback signal is reduced.
4. Verfahren nach einem der Ansprüche 1 - 3, dadurch ge¬ kennzeichnet, daß.die gemessen Fehlerrate tiefpaßgefil¬ tert wird.4. The method according to any one of claims 1-3, characterized ge indicates that the measured error rate is low pass filtered.
5. Verfahren nach einem der Ansprüche 1 - 3, dadurch ge¬ kennzeichnet, daß bei Mobilempfang der Schwellwert für die Empfangs- bzw. Ubertragungsgualität in Abhängigkeit der Fahrtgeschwindigkeit verändert wird.5. The method according to any one of claims 1-3, characterized ge indicates that in the case of mobile reception, the threshold value for the reception or transmission quality is changed as a function of the speed of travel.
6. Verfahren nach einem der vorhergehenden Ansprüche, da¬ durch gekennzeichnet, daß die Güte der Empfangs- bzw. Ubertragungsgualität dem Kehrwert der Fehlerrate ent¬ spricht. Rundfunkempfänger zum Empfang von digital codierten Ton-Rundfunkdaten (DAB), mit einer Meßeinrichtung zur Messung der Empfangsgualität, z.B. einer Bitfehlerra¬ ten-Meßeinrichtung, einer Steuereinrichtung zur Steue¬ rung der Wiedergabe der Ton-Rundfunkdaten, wobei in der Steuereinrichtung ein Empfangsqualitäts-Schwellwert festgelegt ist, und bei Unterschreiten der gemessen .Emp¬ fangsgualität unter den Schwellwert die Steuereinrich¬ tung die Wiedergabegualität und/oder die Wiedergabesi¬ gnale wahrnembar verändert. 6. The method according to any one of the preceding claims, characterized in that the quality of the reception or transmission quality corresponds to the reciprocal of the error rate. Radio receiver for receiving digitally coded audio broadcast data (DAB), with a measuring device for measuring the reception quality, for example a bit error rate measuring device, a control device for controlling the reproduction of the audio broadcast data, with a reception quality threshold value in the control device is fixed, and if the measured reception quality falls below the threshold value, the control device noticeably changes the reproduction quality and / or the reproduction signals.
EP92911319A 1991-06-05 1992-05-26 Process for processing and reproducing received, digitally coded audio data and radio receiver for digital audio broadcast data (dab) Revoked EP0587655B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4118424 1991-06-05
DE4118424A DE4118424A1 (en) 1991-06-05 1991-06-05 METHOD FOR PROCESSING AND PLAYING BACK RECEIVED DIGITALLY CODED AUDIO DATA AND BROADCASTING RECEIVER FOR RECEIVING DIGITALLY CODED SOUND BROADCASTING DATA (DAR)
PCT/EP1992/001182 WO1992022154A1 (en) 1991-06-05 1992-05-26 Process for processing and reproducing received, digitally coded audio data and radio receiver for digital audio broadcast data (dab)

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EP0587655A1 true EP0587655A1 (en) 1994-03-23
EP0587655B1 EP0587655B1 (en) 1997-02-26

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EP (1) EP0587655B1 (en)
JP (1) JP3325570B2 (en)
KR (1) KR100188611B1 (en)
AT (1) ATE149273T1 (en)
DE (2) DE4118424A1 (en)
ES (1) ES2099259T3 (en)
HK (1) HK119497A (en)
SG (1) SG44892A1 (en)
WO (1) WO1992022154A1 (en)

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US5483690A (en) 1996-01-09
WO1992022154A1 (en) 1992-12-10
ES2099259T3 (en) 1997-05-16
ATE149273T1 (en) 1997-03-15
JPH06508245A (en) 1994-09-14
DE4118424A1 (en) 1992-12-10
KR940701611A (en) 1994-05-28
EP0587655B1 (en) 1997-02-26
JP3325570B2 (en) 2002-09-17
KR100188611B1 (en) 1999-06-01
DE59208074D1 (en) 1997-04-03
SG44892A1 (en) 1997-12-19
HK119497A (en) 1997-09-05

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