EP1516512B1 - Procede d'evaluation de la qualite de reception d'un recepteur de radiodiffusion stereophonique et recepteur de radiodiffusion stereophonique - Google Patents

Procede d'evaluation de la qualite de reception d'un recepteur de radiodiffusion stereophonique et recepteur de radiodiffusion stereophonique Download PDF

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Publication number
EP1516512B1
EP1516512B1 EP03740360A EP03740360A EP1516512B1 EP 1516512 B1 EP1516512 B1 EP 1516512B1 EP 03740360 A EP03740360 A EP 03740360A EP 03740360 A EP03740360 A EP 03740360A EP 1516512 B1 EP1516512 B1 EP 1516512B1
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Prior art keywords
signal
pass filter
reception quality
band pass
correlation
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Expired - Lifetime
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EP03740360A
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German (de)
English (en)
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EP1516512A1 (fr
Inventor
Christoph Benz
Stefan Gierl
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Harman Becker Automotive Systems GmbH
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Harman Becker Automotive Systems GmbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/007—Two-channel systems in which the audio signals are in digital form
    • 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
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
    • H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving

Definitions

  • the invention relates to a method for evaluating the reception quality in a stereo radio receiver with a receiver for generating the stereo multiplex signal from which a decoder generates the (L + R) signal and by means of a subcarrier, the upper and lower sideband of the (L-R) signal.
  • the invention further relates to a stereo radio receiver having a receiver for generating the stereo multiplex signal and a decoder for generating the (L + R) signal and the upper and lower sideband of the (L-R) signal by means of a subcarrier from the stereo multiplex signal.
  • High quality stereo radio receivers for motor vehicles are suitable for multipath reception, e.g. for antenna or frequency diversity or a combination of both.
  • Multipath reception refers to the reception of radio signals on one of several transmission paths or channels.
  • Multi-path reception is known by means of one of several alternative antennas, which is referred to as antenna diversity, and on one of several alternative reception frequencies, which is understood by the term frequency diversity.
  • An antenna diversity receiving system is a radio receiving system with a radio receiver that can be connected to one of several, usually spatially separated antennas. Such antenna diversity reception systems are used for example in motor vehicles.
  • the antennas are preferably pane antennas, which are integrated, for example, in the windows of the motor vehicle.
  • an antenna diversity receiving system such as a stereo radio receiver, a television receiver or a telephone system, selects a selection circuit according to predetermined criteria one of the antennas for connection to the radio receiver.
  • Such a criterion for evaluating the reception quality is e.g. the reception field strength or interference interference occurring at higher reception field strengths, for example caused by disturbing multipath reception due to signal reflections on mountains, buildings or similar radio waves reflecting media.
  • a frequency diversity receiving system is a radio receiving system with one antenna and at least two radio receivers.
  • the one radio receiver serves as the operating receiver, while the other radio receiver searches as a search and test receiver alternative receiving frequencies and checks their reception quality. If the search receiver finds an alternative reception frequency which offers better reception quality than the reception frequency currently set for the operation receiver, then either the operation receiver is tuned to the new reception frequency found or the search and operation receiver exchange their roles.
  • the search receiver then remains tuned to the found immediately optimal reception frequency and takes over the task of the previous operation receiver, who now seeks as a search receiver alternative reception frequencies and checks their reception quality.
  • the operating receiver is also referred to as a listening receiver, while for the search recipient the term background receiver is in use.
  • frequency diversity reception systems are also particularly suitable for use in motor vehicles because, as a result of the constantly changing shape of the terrain, the reception conditions also change during the journey.
  • Particularly advantageous is a combination of antenna and frequency diversity.
  • FM broadcasters transmit the so-called stereo multiplex signal, which is formed from the audio signal signal - also called mono signal with a frequency up to 15 kHz, the stereo pilot tone with a frequency of 19 kHz and the stereo signal with a frequency of 23 kHz to 53 kHz.
  • the mono signal is the sum signal from the left and right channels and is therefore also called the (L + R) signal.
  • the stereo signal consists of the lower and upper sidebands of the difference signal from the left and right channels.
  • the term (L-R) is common.
  • the upper and lower sidebands of the (L-R) signal are generated by means of a subcarrier of 38 KHz.
  • the (L + R) signal and the subcarrier of 38 kHz generated in the stereo radio receiver become the upper and the lower Sideband of the (LR) signal won.
  • the left-channel audio signal, called the L signal, and the right channel audio signal, the R signal are produced is formed formed.
  • the analog stereo multiplexed signal is digitized prior to further processing.
  • the reception quality is to be determined on the basis of a criterion. It is known to determine the reception quality by evaluating the reception field strength or interference interference. For this, e.g. the IF signal or the RF signal are evaluated.
  • the reception quality should be evaluated according to strict standards.
  • EP-A-0617519 describes a switching arrangement for deriving at least one of the quality of a received signal-dependent quality signal.
  • the symmetry of sidebands of the (LR) signal is evaluated. This is done by multiplying the auxiliary carrier-frequency differential signal by an orthogonal reference carrier, so that with ideal carrier synchronization and with symmetrical, ie undisturbed sidebands, a signal amplitude of 0 must result for the signal demodulated in this way.
  • this object is achieved by the features specified in claim 1 in that a criterion for evaluating the reception quality is derived from the signal energy or power of the upper and lower sideband of the (LR) signal.
  • this object is achieved by the features specified in claim 11 in that a criterion for evaluating the reception quality is derived from the signal energy or power of the upper and lower sideband of the (L-R) signal.
  • the invention proposes deriving from the signal energy or the power of the upper and lower sideband of the (L-R) signal a criterion for evaluating the reception quality.
  • the invention is based on the following findings and considerations.
  • the upper and lower sidebands of the (L-R) signal are identical with respect to the subcarrier of 38 KHz.
  • the spectral distribution of the interfering components after demodulation will result in the lower and upper sideband of the (L-R) signal no longer being identical, but more or less different. This effect is used according to the invention to detect disturbances and thus to assess the reception quality.
  • a first embodiment of the invention provides to compare the signal energy or the performance of the upper sideband with that of the lower sideband. The greater the difference between the two signal energies or powers compared with one another, the greater the interference and the worse the reception quality.
  • Optimum reception quality is when the signal energies or powers of the upper and lower sidebands are the same.
  • a further embodiment of the invention provides for the cross-correlation function of the signals or the power of the lower sideband to be formed with the signal energy or power of the upper sideband.
  • the cross-correlation represents a very accurate measure of the reception quality.
  • a further embodiment of the invention provides for filtering the lower sideband of the (L-R) signal by means of a first bandpass filter and the upper sideband of the (L-R) signal by means of a second bandpass filter.
  • the two bandpasses are dimensioned so that their passbands do not overlap.
  • the center frequency of the first bandpass is e.g. 31 KHz, while that of the second bandpass is 45 KHz.
  • a further embodiment of the invention provides to put the output signals of the two band passes by mixing with the subcarrier of 38 KHz in each mixer in the baseband layer and then to filter by means of a low-pass before the signal energies or the power are compared or the Cross-correlation function is formed.
  • the cross-correlation function becomes formed the output signals of the two low passes, which is a strict measure of the reception quality.
  • FIG. 1 is a block diagram of an embodiment of a stereo broadcast receiver according to the invention shown.
  • An antenna A is connected to the antenna input of a receiver E whose output, at which the stereo multiplex signal MPX can be tapped off, is connected to the input of a decoder DSP, preferably a digital signal processor.
  • the first output of the digital signal processor DSP, at which the (LR) signal can be tapped, is connected to the first input of a stereo matrix MX, the input of a first bandpass filter BP1 and the input of a second bandpass filter BP2.
  • the second output of the digital signal processor DSP, at which the (L + R) signal is removable, is connected to the second input of the stereo matrix MX, whose first output, at which the L signal L can be tapped off, with a first loudspeaker, the left speaker LL, and whose second output, at which the R signal R can be tapped off, is connected to a second loudspeaker, the right loudspeaker LR.
  • the output of the first bandpass filter is connected to the first input of a first mixer M1, to whose second input the subcarrier H of 38 KHz is applied and whose output to the input a first low pass TP1 is connected.
  • the output of the second bandpass filter BP2 is connected to the first input of a second mixer M2, to the second input of the subcarrier H of 38 KHz and whose output is connected to the input of a second low-pass filter TP2.
  • the output of the first low-pass filter TP1 is connected to the first input and the output of the second low-pass filter TP2 to the second input of a unit K for forming the cross-correlation function, at whose output a cross-correlation signal Q is removable, which represents a measure of the reception quality.
  • the cross-correlation signal Q is supplied, for example, to a control unit S, which tunes the receiver E to the best reception frequency or, in the case of an antenna diversity reception system, switches the antenna with the best reception to the receiver E. It may, however, also be a combination of an antenna diversity and frequency diversity reception system with multiple antennas and receivers, which for the sake of clarity not in FIG. 1 are drawn.
  • the part of the invention in FIG. 1 consists of the two bandpass filters BP1 and BP2, the two mixers M1 and M2, the two low-pass filters TP1 and TP2 and the unit K for forming the cross-correlation function and is shown in FIG FIG. 1 bordered by dashed lines.
  • FIG. 2 illustrated frequency spectrum of the stereo multiplex signal explained.
  • the (L + R) signal also called the mono or sum signal, extends from 20 Hz to 15 KHz. At 19 KHz the pilot tone P is located, followed by the lower sideband of the (LR) signal from 23 KHz to about 38 KHZ. Beyond the Subcarrier frequency of 38 KHz, the upper sideband of the (LR) signal extends up to 53 KHz.
  • the digital (LR) signal generated by the digital signal processor DSP from the stereo analog multiplex signal MPX is filtered in a first band pass BP1 at a center frequency of 31 KHz and fed to a mixer M1 where it is mixed with the subcarrier H of 38 KHz in the baseband position is offset.
  • the digital (L-R) signal is filtered by means of the second bandpass filter BP2 with a center frequency of 45 KHz and mixed in a mixer M2 by mixing with the subcarrier H of 38 KHz in the baseband position.
  • the offset to the baseband position output of the mixer M1 is low-pass filtered by the low-pass filter TP1.
  • the offset to the baseband position output signal of the mixer M2 in the low-pass filter TP2 low-pass filtered.
  • the cross-correlation of the output signals of the two low-pass filters TP1 and TP2 is formed.
  • a signal Q representing the cross-correlation which represents a very accurate measure of the reception quality. The higher the correlation, the better the reception quality.
  • the invention is not limited to a digital embodiment. It can also be realized in analog technology.
  • the inventive method and the stereo radio receiver according to the invention are characterized by a very accurate evaluation of the reception quality, which allows in an antenna diversity or frequency diversity reception system a precise switching to an alternative antenna or an alternative reception frequency.
  • the invention is particularly suitable for use in mobile stereo radio receivers, e.g. As in motor vehicles, suitable.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Circuits Of Receivers In General (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Claims (26)

  1. Procédé d'évaluation de la qualité de réception dans un récepteur de radiodiffusion stéréophonique comprenant un récepteur (E) pour la génération du signal stéréophonique multiplex (MPX) à partir duquel un décodeur (DSP) génère le signal (L+R), et par l'intermédiaire d'une sous-porteuse auxiliaire (H) génère les bandes latérales supérieure et inférieure du signal (L-R),
    caractérisé par le fait qu'un critère d'évaluation de la qualité de réception est déduit de l'énergie de signal ou de la puissance des bandes latérales inférieure et supérieure (US, OS) du signal (L-R).
  2. Procédé selon la revendication 1, caractérisé par le fait que le critère d'évaluation de la qualité de réception est déduit d'une comparaison de l'énergie de signal ou de la puissance de la bande latérale supérieure (OS) avec celle de la bande latérale inférieure (US) du signal (L-R), la qualité de réception diminuant avec la différence croissante des deux énergies de signal ou des puissances, augmentant par contre avec leur différence décroissante et devenant maximale lorsqu'elles sont égales.
  3. Procédé selon la revendication 1, caractérisé par le fait que le critère d'évaluation de la qualité de réception est déduit de la corrélation croisée des signaux ou de la puissance des bandes latérales supérieure et inférieure (OS, US) du signal (L-R), la qualité de réception augmentant avec une corrélation croissante, diminuant par contre avec une corrélation décroissante.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé par le fait que la bande latérale inférieure (US) est filtrée par l'intermédiaire d'un premier filtre passe-bande (BP1) et que la bande latérale supérieure (OS) est filtrée par l'intermédiaire d'un deuxième filtre passe-bande (BP2).
  5. Procédé selon la revendication 4, caractérisé par le fait que la fréquence centrale du premier filtre passe-bande (BP1) est de 31 kHz et celle du deuxième filtre passe-bande (BP2) est de 45 kHz.
  6. Procédé selon la revendication 4 ou 5, caractérisé par le fait que les bandes passantes des deux filtres passe-bande (BP1, BP2) ne se chevauchent pas.
  7. Procédé selon la revendication 4, 5 ou 6, caractérisé par le fait qu'on prévoit des filtres passe-bande Butterworth du deuxième ordre pour les deux filtres passe-bande (BP1, BP2).
  8. Procédé selon l'une des revendications 4 à 7, caractérisé par le fait que, par mélange avec la sous-porteuse (H) de 38 kHz dans un premier mélangeur (M1), le signal de sortie du premier filtre passe-bande (BP1) est mis en bande de base et ensuite filtré dans un premier filtre passe-bas (TP1), et que, par mélange avec la sous-porteuse (H) de 38 KHz, le signal de sortie du deuxième filtre passe-bande (BP2) est mis en bande de base et ensuite filtré dans un deuxième filtre passe-bas (TP2).
  9. Procédé selon la revendication 8, caractérisé par le fait que l'énergie ou la puissance du signal de sortie du premier filtre passe-bas (TP1) est comparée avec celle du deuxième filtre passe-bas (TP2), et que le critère pour la qualité de réception est déduit de la comparaison des deux énergies ou puissances, la qualité de réception diminuant avec une différence croissante des deux énergies ou puissances, augmentant par contre avec une différence décroissante et devenant maximale quand elles sont égales.
  10. Procédé selon la revendication 8, caractérisé par le fait que la corrélation croisée est formée du signal de sortie du premier filtre passe-bas (TP1) et du signal de sortie du deuxième filtre passe-bas (TP2), la qualité de réception augmentant avec une corrélation croissante, diminuant par contre avec une corrélation décroissante.
  11. Récepteur de radiodiffusion stéréophonique comprenant un récepteur (E) pour la génération du signal stéréophonique multiplex (MPX) et un décodeur (DPS) pour la génération du signal (L+R) ainsi que des bandes latérales supérieure et inférieure (OS, US) du signal (L-R) à partir du signal stéréophonique multiplex (MPX) par l'intermédiaire d'une sous-porteuse (H),
    caractérisé par le fait qu'un critère d'évaluation de la qualité de réception est déduit de l'énergie de signal ou de la puissance des bandes latérales supérieure et inférieure (OS, US) du signal (L-R).
  12. Récepteur de radiodiffusion stéréophonique selon la revendication 11, caractérisé par le fait que le critère d'évaluation de la qualité de réception est déduit d'une comparaison de l'énergie ou de la puissance de la bande latérale supérieure (OS) avec celle de la bande latérale inférieure (US) du signal (L-R), la qualité de réception diminuant avec une différence croissante des deux énergies de signal ou puissances, augmentant par contre avec une différence décroissante et devenant maximale lorsqu'elles sont égales.
  13. Récepteur de radiodiffusion stéréophonique selon la revendication 11, caractérisé par le fait que le critère d'évaluation de la qualité de réception est déduit de la corrélation croisée des signaux des bandes latérales supérieure et inférieure (OS, US) du signal (L-R), la qualité de réception augmentant avec une corrélation croissante, diminuant par contre avec une corrélation décroissante.
  14. Récepteur de radiodiffusion stéréophonique selon la revendication 12 ou 13, caractérisé par le fait qu'un premier filtre passe-bande (BP1) est prévu pour filtrer la bande latérale inférieure (US) et qu'un deuxième filtre passe-bande (BP2) est prévu pour filtrer la bande latérale supérieure (OS) du signal (L-R).
  15. Récepteur de radiodiffusion stéréophonique selon la revendication 14, caractérisé par le fait que la fréquence centrale du premier filtre passe-bande (BP1) est de 31 kHz et celle du deuxième filtre passe-bande (BP2) est de 45 kHz.
  16. Récepteur de radiodiffusion stéréophonique selon la revendication 14 ou 15, caractérisé par le fait que les bandes passantes des deux filtres passe-bande (BP1, BP2) ne se chevauchent pas.
  17. Récepteur de radiodiffusion stéréophonique selon la revendication 14, 15 ou 16, caractérisé par le fait qu'on prévoit des filtres passe-bande Butterworth du deuxième ordre pour les deux filtres passe-bande (BP1, BP2).
  18. Récepteur de radiodiffusion stéréophonique selon l'une des revendications 14 à 17, caractérisé par le fait que, par mélange avec la sous-porteuse (H) de 38 kHz dans un premier mélangeur (M1), le signal de sortie du premier filtre passe-bande (BP1) est mis en bande de base et ensuite filtré dans un premier filtre passe-bas (TP1), et que, par mélange avec la sous-porteuse (H) de 38 kHz dans un deuxième mélangeur (M2), le signal de sortie du deuxième filtre passe-bande (BP2) est mis en bande de base et ensuite filtré dans un deuxième filtre passe-bas (TP2).
  19. Récepteur de radiodiffusion stéréophonique selon la revendication 18, caractérisé par le fait que l'énergie ou la puissance du signal de sortie du premier filtre passe-bas (TP1) est comparable à celle du deuxième filtre passe-bas (TP2), et que le critère pour la qualité de réception est déduit de la comparaison des deux énergies ou puissances, la qualité de réception diminuant avec une différence croissante des deux énergies ou puissances, augmentant par contre avec une différence décroissante et devenant maximale quand elles sont égales.
  20. Récepteur de radiodiffusion stéréophonique selon la revendication 18, caractérisé par le fait que la corrélation croisée est formée du signal de sortie du premier filtre passe-bas (TP1) et du signal de sortie du deuxième filtre passe-bas (TP2), la qualité de réception augmentant avec une corrélation croissante, diminuant par contre avec une corrélation décroissante.
  21. Récepteur de radiodiffusion stéréophonique selon la revendication 20, caractérisé par le fait que le signal (L-R) est appliqué à l'entrée du premier filtre passe-bande (BP1) et du deuxième filtre passe-bande (BP2), que la sortie du premier filtre passe-bande (BP1) est reliée à la première entrée du premier mélangeur (M1), à la deuxième entrée duquel est appliquée la sous-porteuse (H), que la sortie du deuxième filtre passe-bande (BP2) est reliée à la première entrée du deuxième mélangeur (M2), à la deuxième entrée duquel est appliquée la sous-porteuse (H), que la sortie du premier mélangeur (M1) est reliée à l'entrée d'un premier filtre passe-bas (TP1) dont la sortie est reliée à la première entrée d'une unité (K) pour la génération de la corrélation croisée, que la sortie du deuxième mélangeur (M2) est reliée à l'entrée d'un deuxième filtre passe-bas (TP2) dont la sortie est reliée à la deuxième entrée de l'unité (K) pour la formation de la corrélation croisée, et qu'à la sortie de l'unité (K) pour la formation de la corrélation croisée, on peut prélever un signal de qualité (Q) représentant une mesure pour la qualité de réception.
  22. Récepteur de radiodiffusion stéréophonique selon la revendication 21, caractérisé par le fait que la sortie de l'unité (K) pour la formation de la corrélation croisée est reliée à l'entrée d'une unité de commande (S) dont la sortie est reliée à l'entrée de commande du récepteur (E) ou d'un commutateur d'antenne.
  23. Récepteur de radiodiffusion stéréophonique selon la revendication 21 ou 22, caractérisé par le fait que des filtres passe-bande Butterworth du deuxième ordre sont prévus en tant que filtres passe-bande (BP1, BP2).
  24. Récepteur de radiodiffusion stéréophonique selon la revendication 21, 22 ou 23, caractérisé par le fait que les bandes passantes des deux filtres passe-bande (BP1, BP2) ne se chevauchent pas.
  25. Récepteur de radiodiffusion stéréophonique selon l'une des revendications 21 à 24, caractérisé par le fait que la fréquence centrale du premier filtre passe-bande (BP1) est de 31 kHz et celle du deuxième filtre passe-bande (BP2) est de 45 kHz.
  26. Récepteur de radiodiffusion stéréophonique selon l'une des revendications 21 à 25, caractérisé par le fait que la sous-porteuse (H) présente une fréquence de 38 kHz.
EP03740360A 2002-06-27 2003-06-26 Procede d'evaluation de la qualite de reception d'un recepteur de radiodiffusion stereophonique et recepteur de radiodiffusion stereophonique Expired - Lifetime EP1516512B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10228723A DE10228723B4 (de) 2002-06-27 2002-06-27 Verfahren zur Bewertung der Empfangsqualität eines Stereorundfunkempfängers und Stereorundfunkempfänger
DE10228723 2002-06-27
PCT/EP2003/006793 WO2004004417A1 (fr) 2002-06-27 2003-06-26 Procede d'evaluation de la qualite de reception d'un recepteur de radiodiffusion stereophonique et recepteur de radiodiffusion stereophonique

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EP1516512A1 EP1516512A1 (fr) 2005-03-23
EP1516512B1 true EP1516512B1 (fr) 2009-03-25

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EP03740360A Expired - Lifetime EP1516512B1 (fr) 2002-06-27 2003-06-26 Procede d'evaluation de la qualite de reception d'un recepteur de radiodiffusion stereophonique et recepteur de radiodiffusion stereophonique

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US (1) US20060046676A1 (fr)
EP (1) EP1516512B1 (fr)
AT (1) ATE427007T1 (fr)
AU (1) AU2003280407A1 (fr)
DE (2) DE10228723B4 (fr)
WO (1) WO2004004417A1 (fr)

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FR2954640B1 (fr) * 2009-12-23 2012-01-20 Arkamys Procede d'optimisation de la reception stereo pour radio analogique et recepteur de radio analogique associe

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DE4027399C2 (de) * 1990-08-30 1995-11-30 Blaupunkt Werke Gmbh UKW-Autoradio
GB9107919D0 (en) * 1991-04-15 1991-05-29 Gen Electric Co Plc Radio receiver systems
DE4309518A1 (de) * 1993-03-24 1994-10-06 Blaupunkt Werke Gmbh Schaltungsanordnung zur Ableitung mindestens eines von der Qualität eines empfangenen Signals abhängigen Qualitätssignals
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US20060046676A1 (en) 2006-03-02
DE50311339D1 (de) 2009-05-07
EP1516512A1 (fr) 2005-03-23
AU2003280407A1 (en) 2004-01-19
DE10228723B4 (de) 2007-04-26
WO2004004417A1 (fr) 2004-01-08
ATE427007T1 (de) 2009-04-15
DE10228723A1 (de) 2004-01-22

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