EP0065615B1 - Récepteur-UHF pour un système de radio-diffusion d'informations routières - Google Patents

Récepteur-UHF pour un système de radio-diffusion d'informations routières Download PDF

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Publication number
EP0065615B1
EP0065615B1 EP82100826A EP82100826A EP0065615B1 EP 0065615 B1 EP0065615 B1 EP 0065615B1 EP 82100826 A EP82100826 A EP 82100826A EP 82100826 A EP82100826 A EP 82100826A EP 0065615 B1 EP0065615 B1 EP 0065615B1
Authority
EP
European Patent Office
Prior art keywords
subcarrier
modulation
switch
output
announcement
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
Application number
EP82100826A
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German (de)
English (en)
Other versions
EP0065615A1 (fr
Inventor
Norbert Dipl.-Phys. Eilers
Peter Ing. grad. Brägas
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 AT82100826T priority Critical patent/ATE9413T1/de
Publication of EP0065615A1 publication Critical patent/EP0065615A1/fr
Application granted granted Critical
Publication of EP0065615B1 publication Critical patent/EP0065615B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/091—Traffic information broadcasting
    • G08G1/094—Hardware aspects; Signal processing or signal properties, e.g. frequency bands

Definitions

  • the invention relates to an FM receiver for a radio transmission system according to the preamble of claim 1.
  • the traffic radio stations which broadcast such messages more or less regularly, are characterized by a 57 kHz subcarrier broadcast in addition to the useful modulation, which is broadcast as the third multiple of the 19 kHz stereo pilot tone in synchronous fashion with stereo transmitters.
  • the 57 kHz subcarrier is phase locked to the pilot tone with zero crossings in the same direction.
  • This subcarrier also serves to transmit additional information - also called identifiers - which is transmitted as amplitude modulation of the subcarrier. (DBP 20 51 034)
  • the announcement identifier consists of a very narrow frequency band at 125 Hz, which modulates the subcarrier with 30% in its amplitude.
  • switching devices in the LF stage are controlled in a receiver intended for the system via a 57 kHz detector and an amplitude demodulator; be it to increase the volume during the announcement or, if the receiver is muted, to unmute it or, in the case of combined radio-cassette recorders, also to switch from cassette playback to playback of the traffic announcement when it starts and to switch back to cassette playback, when the announcement is finished.
  • Another information transmitted by the subcarrier is used to identify traffic radio areas. All VHF traffic radio stations that are located in a specific geographical area are identified by a uniform identifier - area identifier (BK). The traffic news of the stations with the same BK concern the same geographical area.
  • This area identifier is continuously modulated onto the subcarrier. It modulates the amplitude of the subcarrier by 60%.
  • the bandwidth of the individual area identifiers and their position relative to one another is selected such that an adjacent channel attenuation of greater than 15 dB results with a quality of greater than 20. 6 range identifiers have been defined within the available frequency band below the announcement identifier, whereby it is ensured that the harmonics of the identifiers fall between the other identifiers. (DBP 22 40 941)
  • the subcarrier is thus modulated with two identifiers, the BK and the DK, and outside the time of the traffic announcements only with one identifier, the BK.
  • each traffic radio station can also be assigned its own BK if the number of available BKs is sufficient for this.
  • the presence of the 57 kHz subcarrier can be used to interrupt the search only when traffic information stations are received. Since 57 kHz is the third multiple of the 19 kHz pilot tone, there is a risk that, due to non-linearities in the transmitter or receiver, harmonics of the 19 kHz pilot tone may also occur with non-traffic radio transmitters.
  • An auxiliary branch has therefore been provided in the detector for the 57 kHz subcarrier, which only releases the detector output when another detector indicates the presence of the area identifier. (DBP 25 33 946)
  • the degree of modulation of the subcarrier is measured by the area identifier and the search is only allowed to remain on the traffic radio station when the correct degree of modulation is found to be 60%.
  • This traffic radio system works in wide reception areas to full satisfaction.
  • incorrect switching was more common when evaluating the announcement identifier.
  • a modulation of the 57 kHz carrier is more often used, which can simulate an announcement identifier and thus cause incorrect switchovers in the LF stage.
  • the task is therefore to improve the recognition of the announcement identifier in the receiver.
  • the receiver in FIG. 1 receives its input signal via antenna 1 the desired station is set.
  • the transmitter user modulation can be removed from the ratio detector which closes the subsequent IF stage 3 and, in addition to the message intended for the radio subscriber, contains an amplitude-modulated 57 kHz subcarrier.
  • Via a switchover device 4, the messages just mentioned or the signals from a tape player 5 are optionally sent to the LF stage 6, to which a loudspeaker 7 is connected.
  • the switching device 4 is either controlled by hand or, when the tape recorder is switched on, is effected by a traffic radio decoder 8, which is also connected to the output of the IF stage 3.
  • the traffic radio decoder is also connected to a station search device 9 which, moreover, controls the setting of a desired station and which is started via the control unit 10.
  • the control unit can in turn be connected to the traffic radio decoder 8 for preselecting a specific traffic radio area.
  • the output signal of the IF stage 3 is examined in the detector 11 of the traffic radio decoder 8 shown in FIG. 2 for the presence of an amplitude-modulated 57 kHz subcarrier.
  • the amplitude modulation is separated from the subcarrier.
  • This modulation can consist of an area identifier BK and, in the case of a traffic announcement, additionally of an announcement identifier DK.
  • Two filters 13, 14 connected in parallel, the first with a passband that only includes the area identifiers and the latter with a passband for the announcement identifier alone, separate the two possible identifiers.
  • An announcement identification decoder 19 is connected to the output of the filter 14, which only allows the announcement identifiers DK to pass through. Its output signal is forwarded to a coincidence stage 18.
  • a BK decoder 17 which indicates the area identifier transmitted by the received traffic radio station.
  • a second control signal is emitted to the coincidence stage 18 if the preselected and the transmitted BK match.
  • the switching stage 4 receives a switching pulse in the known devices, which causes the receiver to switch through to the N F stage 6, provided the tape recorder 5 is switched via the switching stage 4 when the switching pulse is received is connected to NF level 6.
  • the known switching device 4 in the N F stages of the receiver therefore responds each time the set traffic radio station makes a traffic announcement and the combination device is switched to tape playback, or only if the set traffic radio transmitter is also assigned to the preselected traffic radio area and via an announcement is broadcast on this station.
  • the filter 13 is also connected to a measuring device 15 for the degree of modulation of the auxiliary carrier by the area identifier. As long as the measured value is above the degree of modulation specified as the desired value, a coincidence stage 16 receives a control signal from the measuring device 15. The auxiliary support is also present at a further entrance of coincidence level 16. The output signal of the coincidence stage 16 is then further processed in the transmitter search device 9 as a criterion for the presence of the 57 kHz auxiliary carrier, e.g. as a stop signal for the station search.
  • the part of the traffic radio decoder 8 described so far belongs to the prior art and is used in many traffic radio receivers.
  • this known circuit is supplemented by a further filter 22, which is parallel to the two filters 13 and 14 at the output of the demodulator 12.
  • the pass band of this filter is selected so that it encompasses both identifiers BK and DK.
  • a further measuring device 20 is connected downstream of this filter, which measures the total degree of modulation of the amplitude of the subcarrier by the area and announcement identifier, which changes in time in contrast to the degree of modulation of the subcarrier by the area identifier, as shown in FIG. 3, since the announcement identifier in contrast for area identification is not permanently available.
  • the two measuring devices 15 and 20 can be largely the same.
  • the output of the measuring device 20 is connected to an input of the coincidence stage 18 in FIG. 2. If the degree of modulation of the subcarrier increases significantly from 60% to around 90%, the measuring device 20 generates a control signal. This means that the coincidence stage 18 only passes on a control signal when the total degree of modulation of the auxiliary carrier rises significantly from the predetermined value - here 60% - in the present case by 50%.
  • the circuit further developed in accordance with the invention thus only triggers the switching device 4 when, in addition to the announcement identifier, a significant increase in the degree of modulation of the subcarrier has also been determined.
  • the degree of modulation drops again to 60%, the predetermined value, the switching device 4 is reset.
  • the switching device 4 can also be controlled solely by the control signal of the measuring device 20. This is indicated in FIG. 2 by the dashed connection between the measuring device 20 and the switching device 4.
  • FIG. 4 shows an exemplary embodiment of a measuring device 20.
  • FIG. 3 is again explained in more detail.
  • the time course of the modulation of the 57 kHz auxiliary carrier according to the prior art is indicated in FIG. 3.
  • the amplitude of the subcarrier is modulated solely by the area identifier, with a degree of modulation of 60%, ie the amplitude of the subcarrier fluctuates between 40% and 160% of its unmodulated value.
  • the announcement identifier is also switched on at the transmitter end.
  • the degree of modulation of the subcarrier amplitude by this identifier alone is 30%; the overall degree of modulation of the subcarrier thus increases from 60% to 90%, ie by 50%, and the subcarrier amplitude now fluctuates between 10% and 190% of the unmodulated value.
  • the auxiliary carrier with its amplitude modulation is filtered out from the useful modulation MPX of the transmitter by the 57 kHz detector 11.
  • the detector comprises a control amplifier 21, which ensures a constant amplitude of the subcarrier.
  • control amplifiers are known.
  • the time constant of the control amplifier is considerably greater than the period of the low modulation frequency of the subcarrier, it can be 1 s or more.
  • the output signal of the detector is demodulated in the subsequent demodulator 12, so that the entire amplitude modulation of the subcarrier is available at the output of the demodulator.
  • a low or bandpass 22 is connected to the output of the modulator 12, the upper limit frequency of which corresponds to or lies above the highest modulation frequency of the subcarrier.
  • a rectifier 23 follows this bandpass filter. Since the subcarrier is kept constant in the control amplifier 21, a special comparison between the entire modulation amplitude and the unmodulated subcarrier amplitude is no longer necessary here. The output amplitude of the rectifier 23 is uniquely assigned to the degree of modulation of the subcarrier.
  • a first threshold switch 24, a Schmitt trigger is controlled directly with the output signal of the rectifier 23, while another Schmitt trigger as the second threshold switch 26 is connected to the output of the rectifier 23 via a voltage divider 25.
  • This voltage divider comprises two resistors 27, 28, of which the resistor 27 located directly on the rectifier 23 is half the size of the second resistor 28 which is connected to ground. This results in a voltage division of 1: 2.
  • the first Schmitt trigger 24 is switched as soon as the output voltage of the rectifier 23 reaches a value which approximately corresponds to a degree of modulation of 60% of the subcarrier.
  • the second Schmitt trigger 26 which is set to the same threshold value, only responds when the voltage value associated with a degree of modulation of 90% is approximately reached at the output of the rectifier. This increase from 60 to 90% degree of modulation always occurs when the announcement identifier is switched on at the transmitter. This further voltage increase at the output of the rectifier leaves the Schmitt trigger 24 unaffected.
  • the output signals of the two Schmitt triggers 24, 26 are combined in an AND circuit 29.
  • the AND circuit 19 then supplies directly or indirectly (FIG. 2) the control signals for the known switching device 4 in the LF stage.
  • the output signal of the Schmitt trigger 24 can be used to indicate the presence of the auxiliary carrier and represents a variant of the measuring device 15 and the coincidence stage 16 of FIG. 2.
  • the indirect control of the switchover device 4 via the coincidence stage 18 proves to be advantageous if several announcement identifiers are used for different program types and these are in a frequency range that connects to the lower limit frequency of the actual radio broadcasts.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Burglar Alarm Systems (AREA)
  • Near-Field Transmission Systems (AREA)
  • Details Of Aerials (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Selective Calling Equipment (AREA)
  • Radar Systems Or Details Thereof (AREA)

Claims (6)

1. Récepteur d'ondes très courtes destiné à un système de transmission radio avec un démodulateur de fréquence pour les signaux d'émission, un détecteur (11 ) pour une porteuse auxiliaire à 57 kHz modulée en amplitude dans le signal d'émission et un modulateur d'amplitude (12) pour la porteuse auxiliaire à 57 kHz, ainsi qu'une installation de commutation (4) dans l'étage BF, et qui sont susceptibles d'être commandés par la modulation d'amplitude de la porteuse auxiliaire et une installation de mesure (15) pour le degré de modulation de la porteuse auxiliaire dans une zone defréquence prédéterminée dans la modulation de la porteuse auxiliaire, caractérisé par une seconde installation de mesure (20) qui détecte l'ensemble de la plage de la modulation d'amplitude de la porteuse auxiliaire et qui, pour une augmentation significative du degré de modulation global par rapport à une valeur prédéterminée pour un degré de modulation plus élevé et pendant la durée de celui-ci, déclenche un signal de commande pour l'installation de commutation (4) de l'étage BF.
2. Récepteur OTC selon la revendication 1, caractérisé en ce que la seconde installation de mesure (20) lors de l'augmentation du degré de modulation d'essentiellement 50% par rapport à la valeur prédéterminée déclenche un signal de commande.
3. Récepteur OTC selon la revendication 2, caractérisé en ce que la seconde installation de mesure (20) déclenche un signal de commande lors de l'augmentation du degré de modulation passant de 60 à 90%.
4. Récepteur OTC selon l'une des revendications 1, 2 ou 3, caractérisé en ce que le détecteur (11) est suivi d'un amplificateur de réglage (21) pour la porteuse auxiliaire, celui-ci étant suivi par un filtre (22) dont la largeur de la bande passante correspond à l'ensemble de la plage de fréquences de la modulation d'amplitude de la porteuse auxiliaire, et en ce que l'installation de mesure suivante comporte un redresseur (23) et deux commutateurs de valeur de seuil (24, 26), en ce que la sortie du second commutateur à valeur de seuil (26) associée à un degré de modulation plus élevé est reliée à la seconde entrée d'un commutateur ET (29) dont la première entrée est reliée directement à la sortie du premier commutateur à valeur de seuil (24) correspondant à un degré de modulation plus faible, et en ce que le signal de sortie du circuit ET (29) commande l'installation de commutation (4).
5. Récepteur OTC selon la revendication 4, caractérisé en ce que, entre la sortie du redresseur (23) et l'entrée du second commutateur à valeur de seuil (26), il est prévu un diviseur de tension (25) dont le rapport des résistances de division est égal à 1:2 et en ce que les deux commutateurs à valeur de seuil (24, 26) sont réglés sur la même valeur de seuil qui correspond à un degré de modulation de 60%.
6. Récepteur OTC selon l'une des revendications 1 à 5, avec un décodeur de caractéristique de message, caractérisé en ce que la sortie de la seconde installation de mesure (20) est reliée à la première entrée d'un étage de coïncidence (18) dont la seconde entrée est reliée à la sortie du décodeur de reconnaissance de message (19) et en ce que le signal de sortie de l'étage de coïncidence (18) commande l'installation de commutation (4).
EP82100826A 1981-05-27 1982-02-05 Récepteur-UHF pour un système de radio-diffusion d'informations routières Expired EP0065615B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82100826T ATE9413T1 (de) 1981-05-27 1982-02-05 Ukw-empfaenger fuer ein ver kehrsrundfunkuebertragungssystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3121088 1981-05-27
DE3121088A DE3121088C2 (de) 1981-05-27 1981-05-27 UKW-Empfänger

Publications (2)

Publication Number Publication Date
EP0065615A1 EP0065615A1 (fr) 1982-12-01
EP0065615B1 true EP0065615B1 (fr) 1984-09-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100826A Expired EP0065615B1 (fr) 1981-05-27 1982-02-05 Récepteur-UHF pour un système de radio-diffusion d'informations routières

Country Status (10)

Country Link
US (1) US4435843A (fr)
EP (1) EP0065615B1 (fr)
JP (1) JPS57199349A (fr)
AT (1) ATE9413T1 (fr)
BR (1) BR8202128A (fr)
CA (1) CA1173508A (fr)
DE (1) DE3121088C2 (fr)
ES (1) ES512551A0 (fr)
MX (1) MX150248A (fr)
ZA (1) ZA822252B (fr)

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JPS6265516A (ja) * 1985-09-17 1987-03-24 Pioneer Electronic Corp 自動車用ステレオ受信機
DE3709523A1 (de) * 1987-03-23 1988-10-13 Bosch Gmbh Robert Rundfunkempfaenger mit mindestens einem verkehrsfunkdecoder
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DE3820640C2 (de) * 1988-06-18 1997-04-03 Bosch Gmbh Robert Auswerteverfahren digitaler Verkehrsnachrichten
DE3820639A1 (de) * 1988-06-18 1989-12-21 Bosch Gmbh Robert Stromsparende stand-by-funktion in tmc-empfaengern
DE3824309A1 (de) * 1988-07-18 1990-01-25 Bosch Gmbh Robert Verfahren zur auswertung von in einem datentelegramm digital codiert empfangener verkehrsnachrichten, sowie rundfunkempfaenger
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DE3906780C1 (fr) * 1989-03-03 1990-08-30 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De
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US5095532A (en) * 1989-12-29 1992-03-10 Robert Bosch Gmbh Method and apparatus for route-selective reproduction of broadcast traffic announcements
US5193214A (en) * 1989-12-29 1993-03-09 Robert Bosch Gmbh Vehicular radio receiver with standard traffic problem database
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US5642397A (en) * 1991-05-01 1997-06-24 Alonzo Williams Paging system which combines a paging signal with a standard broadcast baseband signal
JPH07106989A (ja) * 1993-09-30 1995-04-21 Sony Corp 受信装置
US6112075A (en) * 1994-11-07 2000-08-29 Weiser; Douglas Diedrich Method of communicating emergency warnings through an existing cellular communication network, and system for communicating such warnings
US6018699A (en) 1996-06-04 2000-01-25 Baron Services, Inc. Systems and methods for distributing real-time site specific weather information
US6493633B2 (en) 1996-06-04 2002-12-10 Robert O. Baron, Sr. Systems and methods for distributing real-time site specific weather information
US7339467B2 (en) * 1999-06-11 2008-03-04 At&T Delaware Intellectual Property, Inc. Apparatus and method for providing weather and other alerts
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US20090072995A1 (en) * 2006-06-21 2009-03-19 Dave Thomas Method and apparatus for transmitting information between a primary vehicle and a secondary vehicle
US8350720B2 (en) * 2006-06-21 2013-01-08 Dave Thomas Method and apparatus for object recognition and warning system of a primary vehicle for nearby vehicles

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Also Published As

Publication number Publication date
ES8304389A1 (es) 1983-02-16
JPH0311587B2 (fr) 1991-02-18
ZA822252B (en) 1983-02-23
ATE9413T1 (de) 1984-09-15
ES512551A0 (es) 1983-02-16
EP0065615A1 (fr) 1982-12-01
US4435843A (en) 1984-03-06
JPS57199349A (en) 1982-12-07
DE3121088A1 (de) 1982-12-30
DE3121088C2 (de) 1986-12-04
CA1173508A (fr) 1984-08-28
BR8202128A (pt) 1983-03-22
MX150248A (es) 1984-04-04

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