EP0767553B1 - Circuit pour produire des impulsions d'interruption du son de courte durée pour un récepteur d'automobile - Google Patents

Circuit pour produire des impulsions d'interruption du son de courte durée pour un récepteur d'automobile Download PDF

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Publication number
EP0767553B1
EP0767553B1 EP19950115583 EP95115583A EP0767553B1 EP 0767553 B1 EP0767553 B1 EP 0767553B1 EP 19950115583 EP19950115583 EP 19950115583 EP 95115583 A EP95115583 A EP 95115583A EP 0767553 B1 EP0767553 B1 EP 0767553B1
Authority
EP
European Patent Office
Prior art keywords
level
signal
input
comparison stage
circuit arrangement
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
EP19950115583
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German (de)
English (en)
Other versions
EP0767553A1 (fr
Inventor
Juergen Ing. Grad. Wermuth
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.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Priority to EP19950115583 priority Critical patent/EP0767553B1/fr
Priority to DE59510754T priority patent/DE59510754D1/de
Publication of EP0767553A1 publication Critical patent/EP0767553A1/fr
Application granted granted Critical
Publication of EP0767553B1 publication Critical patent/EP0767553B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04H20/20—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
    • 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
    • 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 circuit arrangement for a car radio the preamble of claim 1.
  • Such a circuit arrangement is for example in a mobile RDS receiver (radio data receiver) appropriate, with the alternative Transmitters are briefly checked for their reception quality. In order to during the duration of the check resulting interference signals not to Speaker, it is necessary to use the AF signal by means of a blanking pulse mute temporarily.
  • Such circuit arrangements are known from the publications DE 4233738, DE 4316683, EP 507096 and EP 597492. As an abrupt However, mute during an existing LF level as annoying perceived pops arise, action is required to this reduce it so much that they are as far as possible no longer perceptible.
  • the invention is based on the object, a circuit arrangement for a Car radio, with the control impulses for short-term alternative transmitter checks be generated with simultaneous muting, the mute is not from the human ear as a noise should be perceived.
  • the advantages achieved by the invention are in particular that the short-term mutes within that of the circuitry recognized, caused by the decay of the hearing hearing shadow respectively. Because a frequent testing of alternative transmitters at high reception field strengths and modulation can be done is an intended control for station selection with decreasing reception field strength already up to date informed about the transmitter landscape, so that alternative frequency tests do not need to be done hastily.
  • the output of a provided with an amplifier stage NF bandpass 1 is connected to the input of a double-path logarithm 2 whose Output via a full-wave rectifier 3 with the input of a Amplifier stage having low pass 2nd order 4 is connected, the has a cutoff frequency of about 23 Hz.
  • the exit of the low pass 4 is connected to the input of an adder 5, with the input of a first Time constant element 6 and with the input of a second Time constant member 7 connected.
  • the output of the adder 5 is connected to the first input A of a logic circuit formed Level comparison stage 8 connected.
  • the output of the first Time constant element 6 is connected to the second input B of Level comparison stage 8 and the output of the second time constant element 7 connected to the third input C of the level comparing stage 8, whose Output D is connected to the input of a pulse shaper 9.
  • Adder 5 adds a DC level to the input level applied to it of, for example, 0.6 volts.
  • the first and the second Time constant element 6, 7 are designed such that their output levels change largely linearly as a function of time.
  • For the first Time Constant 6 is a rate of change of, for example 18 volts per second and for the second time constant element 7 of, for example 1 volt per second provided.
  • the pulse shaper 9 is such designed to be fed by a comparator at one of them Input signal a control pulse (S6) with a duration of, for example 5 ms and then for a duration equal to or greater than 100 ms is blocked for further activations.
  • a multiplex signal (MPX signal) is available and that for a mute and for one during this mute time For example, 8 ms to be performed transmitter check a control pulse should be generated with a duration of about 5 ms.
  • the filtered out of the MPX signal by means of the bandpass 1 LF signal S1 is transmitted through the double-path logarithm 2 and over the Double-way rectifier 3 the low pass 2nd order 4 supplied.
  • Fig. 2 is a graph of such an LF signal S1 in a linear scale played.
  • a signal S2 can be removed, its course of an envelope of the rectified and screened LF signal corresponds, wherein the logarithmic signal S2 to a value of 1 volt per 10 dB level change is amplified.
  • the first entrance of the Logic circuit 8 becomes a DC voltage level of 0.6 volts raised envelope signal S2 supplied as a reference value level S3.
  • the second input B of the logic circuit 8 is the on the first Time constant element 6 whose time constant largely the time constant corresponds to human being's incoming and outgoing vibrations guided signal S2 supplied as a hearing-related signal level S4.
  • the third input C of the logic circuit 8 becomes the second Time constant member 7 supplied as the average level S5 taken signal.
  • the levels S2 and S3 give the envelope curve of the LF signal S1 again. Is, as shown, in point a of Level S3 at the first input A of the logic circuit 8 is less than the level S4 at the second input B and also at point b, the level S3 is smaller than that Level S5, the output D of the logic circuit 8 produces a signal which starts the pulse shaper 9. This one now gives one Control pulse with a duration of about 5 ms and is followed by blocked for further actuations for a duration equal to or greater than 100 ms.
  • the short-term AF blanking also takes place in the audio shadow, it is necessary to increase the level by means of the adder 5 so measured that the envelope level S2 on the one hand about 6 dB below the Ear Curve S4 and on the other hand about 6 dB below the average level S5 lies.
  • the level increase selected in the present embodiment of 0.6 volts can in a practical circuit through a base-emitter threshold a transistor can be generated.
  • the logarithmation of the LF signal ensures that the different volume (modulation range) of the transmitter has no effect on a changeable behavior of the system.
  • Exclusively the Dynamics of modulation is the criterion for controlling the short Mute and verify times.
  • mute signal is about 8 ms long - the invention is based Circuitry also insist that after a recognized Hearing shadow - not within about 8 ms - again a level increase he follows. Practical experiments have shown that about 95% of the 8 ms mutes are in the so-called Hörschatten. This means that only about every twentieth to thirtieth mute can be heard could. In the reality of a RDS concept with mute-occlusion For example, the logic provides the processor with an approximately 3 to 5 ms window for the processor Beginning of the AF test available. If this window is missed, it must open the next to be serviced. Does it come in critical reception situations to temporal problems, so it is in the hands of the software, AF jumps without approval.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Amplifiers (AREA)

Claims (8)

  1. Circuit pour un autoradio permettant de couper brièvement la reproduction d'un programme d'émission reçu à l'aide d'impulsions de commande obtenues à partir d'un signal BF et de vérifier dans la durée de silence des émetteurs alternatifs pour en déterminer la qualité de réception.
    caractérisé par
    des moyens (1, 2', 3, 4) recueillant un signal S2 à partir du signal multiplex de l'autoradio pour une information BF, prise, et dont le niveau correspond à la courbe enveloppe du signal BF (S1) et qui correspond à la courbe d'amplitude de l'information BF et on a un étage de comparaison de niveau (8) et un premier élément à constante de temps (6) ;
    le signal (S2) correspondant à la courbe d'amplitude du signal BF augmente d'une part d'une valeur de niveau prédéterminée et d'autre part retarde le niveau du signal de référence (S3) comme première entrée (A) de l'étage de comparaison de niveau (8) et d'autre part comme niveau de signal (S4) sur une seconde entrée (B2) de l'étage de comparaison de niveau (8) traversant le premier élément à constante de temps (6) dont la constante de temps correspond dans une très large mesure à la constante de temps pour une opération de réception et d'atténuation de la sensibilité des intensités au haut-parleur de l'oreille humaine ; l'étage de comparaison de niveau (8) est dimensionné pour que sa sortie (D) émette l'impulsion de commande (S6) qui lance le circuit de silence et le contrôle d'émetteur si le niveau de référence (S8) appliqué à la première entrée (A) de l'étage de comparaison (8) passe en dessous du niveau de signal (S4) appartenant à la seconde entrée (8).
  2. Circuit selon la revendication 1,
    caractérisé par
    un second élément à constante de temps (7) de sorte que le signal (S2) correspondant à la courbe d'amplitude de l'information (BF) est appliqué à une troisième entrée (C) de l'étage de comparaison de niveau (8) par le second élément de temporisation (7) et sa constante est choisie pour former une valeur moyenne (S5) ; et
    l'étage de comparaison de niveau (8) est dimensionné pour que sa sortie (D) émette l'impulsion de commande (S8) qui lance le circuit de silence et le contrôle d'émetteur si la première entrée (A8) de l'étage de comparaison (8) passe en dessous du niveau de référence (S8) du niveau de signal (S4) appliqué à la seconde entrée (B) et le niveau de signal de valeur moyenne (S5) appliqué à la seconde entrée moyenne (C).
  3. Circuit selon l'une des revendications 1 ou 2,
    caractérisé par
    un étage formé en impulsions (9) conçu pour qu'en présence d'un signal d'entrée qu'il applique à l'étage de comparaison (8), il y ait émission d'une impulsion de commande (S6) d'une durée prédéterminée et ensuite blocage pour d'autres commandes pendant une durée prédéterminée.
  4. Circuit selon l'une des revendications 1 à 3,
    caractérisé en ce que
    les moyens pour obtenir le signal (52) correspondant à la courbe d'amplitude de l'information (BF) se composent d'un filtre passe-bande (BF), d'un circuit logarithmique (S2), d'un redresseur (S3) et d'un filtre passe-bas (4).
  5. Circuit selon la revendication 4,
    caractérisé en ce que
    le filtre passe-bande (BF) (1) est suivi d'un circuit logarithmique à double chemin (2). d'un redresseur à double chemin (3) et d'un filtre passe-bas (2) du quatrième ordre, la succession des circuits logarithmiques (2) et des redresseurs (3) étant quelconque.
  6. Circuit selon la revendication 5.
    caractérisé en ce que
    le filtre passe-bas (4) à une fréquence limite d'environ 23 Hz.
  7. Circuit selon l'une des revendications 1 à 6,
    caractérisé par
    un additionneur (5) de sorte que le signal (S2) correspondant à la courbe d'amplitude de l'information (BF) soit appliqué à la première entrée (A) de l'étage de comparaison (8) en forme de circuit logique par l'additionneur (5) qui forme par addition du niveau de courant enveloppe (BF) (S2) et du niveau de tension continue, le niveau de référence (S3) et le niveau de tension continue est dimensionné pour que les détections produites dans l'ombre d'écoute ne soient pas perceptibles.
  8. Circuit selon l'une des revendications 2 ou 3 à 7, liées à la revendication 2,
    caractérisé en ce que
    le premier et le second élément à constante de temps (6, 7) sont réalisés pour que leur niveau de sortie (S4, S5) varie très largement de façon linéaire en fonction du temps.
EP19950115583 1995-10-02 1995-10-02 Circuit pour produire des impulsions d'interruption du son de courte durée pour un récepteur d'automobile Expired - Lifetime EP0767553B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19950115583 EP0767553B1 (fr) 1995-10-02 1995-10-02 Circuit pour produire des impulsions d'interruption du son de courte durée pour un récepteur d'automobile
DE59510754T DE59510754D1 (de) 1995-10-02 1995-10-02 Schaltungsanordnung für ein Autoradio zur Erzeugung kurzzeitiger Stummschaltimpulse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950115583 EP0767553B1 (fr) 1995-10-02 1995-10-02 Circuit pour produire des impulsions d'interruption du son de courte durée pour un récepteur d'automobile

Publications (2)

Publication Number Publication Date
EP0767553A1 EP0767553A1 (fr) 1997-04-09
EP0767553B1 true EP0767553B1 (fr) 2003-07-23

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ID=8219681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950115583 Expired - Lifetime EP0767553B1 (fr) 1995-10-02 1995-10-02 Circuit pour produire des impulsions d'interruption du son de courte durée pour un récepteur d'automobile

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EP (1) EP0767553B1 (fr)
DE (1) DE59510754D1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2978263B2 (ja) * 1991-03-29 1999-11-15 パイオニア株式会社 Ｒｄｓ受信機
DE4233758C1 (de) * 1992-10-07 1994-01-27 Blaupunkt Werke Gmbh Rundfunkempfänger
JP2841309B2 (ja) * 1992-11-13 1998-12-24 クラリオン株式会社 多重放送受信機
DE4316683A1 (de) * 1993-05-16 1994-11-17 H U C Elektronik Gmbh Verfahren und Schaltungsanordnung zum Rundfunkempfang

Also Published As

Publication number Publication date
DE59510754D1 (de) 2003-08-28
EP0767553A1 (fr) 1997-04-09

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