EP0065616B1 - Emetteur-UHF pour un système de radio-diffusion d'informations routières - Google Patents

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

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Publication number
EP0065616B1
EP0065616B1 EP82100827A EP82100827A EP0065616B1 EP 0065616 B1 EP0065616 B1 EP 0065616B1 EP 82100827 A EP82100827 A EP 82100827A EP 82100827 A EP82100827 A EP 82100827A EP 0065616 B1 EP0065616 B1 EP 0065616B1
Authority
EP
European Patent Office
Prior art keywords
subcarrier
modulation
divider
transmitter according
signal
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
EP82100827A
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German (de)
English (en)
Other versions
EP0065616A1 (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 AT82100827T priority Critical patent/ATE14807T1/de
Publication of EP0065616A1 publication Critical patent/EP0065616A1/fr
Application granted granted Critical
Publication of EP0065616B1 publication Critical patent/EP0065616B1/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 transmitter 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 synchronously with stereo transmitters as the third multiple of the 19 kHz stereo pilot tone.
  • the 57 kHz subcarrier is phase-locked to the pilot tone, with the zero crossings taking place in the same direction.
  • This subcarrier also serves for the transmission of additional information - also called identifiers - which are impressed on the subcarrier as amplitude modulation. (DBP 20 51 034).
  • the announcement identifier consists of a very narrow frequency band at 125 Hz, which modulates the subcarrier with 30% of 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 z. B. to increase the volume during the announcement or when the receiver is muted to unmute 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 certain geographical area are identified by a uniform identifier - in short, area identifier (BK). Your traffic news covers essentially the same geographic area. This area identifier continuously modulates the amplitude of the subcarrier by 60%. The bandwidth of the individual area identifiers and their position in relation to one another are selected such that, with a quality of greater than 20, there is an adjacent channel attenuation of greater than 15 dB. 6 range identifiers have been defined within the available frequency band, ensuring that the harmonics of the identifiers fall between the other identifiers. (DBP 22 40 941)
  • the subcarrier is thus modulated by 2 identifiers, namely with the DK and the BK, outside of the time of the traffic announcements only with one, the BK.
  • the presence of the 7 kHz auxiliary carrier can be used to only let the search stop at traffic information stations. Since the 7 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 and thus 57 kHz will also occur with non-traffic radio stations.
  • 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 also measured by the area identifier and, if the correct degree of modulation is found to be 60%, the search is allowed to remain on the traffic information transmitter.
  • a circuit for detecting the reduction in the degree of modulation of the subcarrier by the 1: identifier during an announcement is in a simultaneously filed European patent application - published under publication no. EP-A-66073.
  • the carrier frequency of the transmitter is generated in the HF generator 1 shown in FIG.
  • this carrier frequency is modulated in frequency with the broadband useful modulation.
  • the frequency-modulated carrier is amplified in a power amplifier 3 and radiated via the antenna 4.
  • the useful modulation of the carrier includes u. a. a 57 kHz subcarrier, on the one hand, with further information, i. H. Identifiers in which the amplitude is modulated, on the other hand, is synchronized with the 19 kHz stereo pilot tone, namely in a phase-locked manner with zero crossings in the same direction.
  • the subcarrier contained in the useful modulation is generated in the 57 kHz generator 5 shown in FIG. 2 and modulated in amplitude in the amplitude modulator 6 with the identifiers.
  • the amplitude-modulated 57 kHz subcarrier is combined with the other useful modulation of the transmitter. This signal is then fed to the frequency modulator 2 of the transmitter.
  • the amplitude modulator 6 has two modulation inputs BK, DK for. two different identifiers. As already mentioned, the first identifier BK is assigned to the transmission area, while the second identifier DK is assigned to the announcement of a traffic announcement.
  • both identifiers are obtained from the subcarrier frequency by integer division, so that the identifiers consist of frequency bands with extremely narrow bandwidth.
  • the division ratios are chosen such that the second identifier lies above the second multiple of the network frequency.
  • switching stage 10 contains only one switch, while switching stage 11 functionally forms a switchable voltage divider with the same resistance values Ro of the two partial resistors 12, 13, which halves the output voltage of divider 9.
  • the output signals of the two dividers 8, 9 are mutually matched to the amplitude of the 57 kHz generator so that each causes the same degree of modulation - namely 60% - of the subcarrier, so that in the first switching state shown here, if only that Output signal of the divider 9 is at the associated input BK of the amplitude modulator 6, the amplitude of the 57 kHz subcarrier is modulated by the BK alone with a modulation degree of 60% and that in the second switching state when the output signals of both dividers 8, 9 the amplitude modulator 6 are supplied, the degree of modulation of the 57 kHz subcarrier is halved by the first identifier BK and is now only 30%, while the degree of modulation of the 57 kHz subcarrier is 60% due to the second identifier DK, both identifiers together thus the amplitude modulate the subcarrier to 90% and in this respect match the existing traffic radio system.
  • the area identifier BK generated by the divider 9 is different in each traffic area. If there is a sufficient number of available area identifiers BK, each transmitter station can be assigned its own BK. The difference of the BK from area to area or from station to station is indicated in the divider 9 by the arrow.
  • the division ratio in the divider 8 can be varied and z.
  • B. Select different identifiers DK for announcements in different languages in a multilingual country.
  • the second identifiers DK can connect in terms of frequency to the frequency range of the lower limit frequency of the announcements.
  • One of the second identifiers DK can thus be 170 Hz.
  • FIG. 3 shows a somewhat more detailed block diagram of the modulator 6.
  • the 57 kHz generator which is designed as a phase-locked loop (PLL), i. H. a voltage-controlled oscillator 15, a phase detector 16 and a low-pass filter 17, upstream a 57 kHz reference source, which is connected to a 57 kHz crystal 18 in mono transmitters, and a triple multiplier 19 for the 19th in stereo transmitters -kHz stereo pilot tone, which is followed by a phase shifter 20 to bring the zero crossings of both amplitudes in the same direction.
  • PLL phase-locked loop
  • the output signal of the 57 kHz reference source is compared in the phase detector 16 with the output signal of the oscillator 15. With the Any correction signal at the output of the phase detector 16 is readjusted via the low-pass filter 17 of the oscillator 15.
  • the oscillator signal is divided down into two digital dividers 8 and 9 with a variable divider ratio, as already mentioned.
  • the choice between three divider ratios is possible, for the BK divider level 9 'the default setting is provided for one of ten divider ratios, namely for the DK divider stage 8' the divider ratios 21, 23 and 25 can be selected, for the BK divider Divider 9 'the default to one of the divider ratios 150, 126, 102, 90, 78, 66, 56, 47, 36, and 29.
  • Such divider 8', 9 ' can be found, for. B. in the Motorola semiconductor manual, 2nd edition 1974, Fig. 4.64.
  • Both divider stages 8 'and 9' are followed by a modulo 16 divider 21, 22, followed by a stair voltage generator 23, 24 in both branches, the output signal of which is passed via a low pass 25, 26, respectively.
  • the staircase voltage generator 23, together with the low-pass filter 25, generates a sinusoidal oscillation from the digital output frequency of the divider stage 21 in a known manner (DAS 25 15 660), so that at the output of the low-pass filter 25, the DK determined by the selected divider ratio is either 169.7 Hz, 154.9 Hz or 142.5 Hz is removable.
  • While the stair voltage generator 24 together with the low-pass filter 26 provides one of the following frequencies in the same way from the digital output signal of the divider stage 22: 23.75 Hz, 28.27 Hz, 34.93 Hz, 39.58 Hz, 45.67 Hz, 53.98 Hz, 63.61 Hz, 75.8 Hz, 98.96 Hz and 122.85 Hz.
  • the low-pass filter is followed by the switching stages 10 and 11 already mentioned, which are controlled by a switch-on amplifier 27 which is connected downstream of the selector switch 14.
  • the switching stages 10, 11 comprise isolating amplifiers 28, 29 in both branches, so that the output signal of the switching stage is not loaded by the subsequent circuit. These isolation amplifiers are adjusted so that the subcarrier is modulated by the output signal to 60% in amplitude when the full output signal of the previous low pass is present at the input.
  • the modulation degree of the subcarrier is halved by the BK by means of the switching stage 11. This reduction in the degree of modulation of the auxiliary carrier by the BK from 60% to 30% takes place synchronously with the activation of the DK, which in turn modulates the auxiliary carrier by 60%.
  • the two output signals of the isolation amplifiers are brought together in an adder stage 30 and their output signal is fed to a control input of the modulator 6, while the output signal of the 57 kHz generator 5 is present at the main input of the modulator 6.
  • the 57 kHz subcarrier modulated in this way is superimposed in a mixing amplifier 31 on the useful modulation MPX of the transmitter and from there is fed to the modulator 2 of the VHF carrier.
  • the output signal of the modulator 6 can be observed via an optionally connectable measuring device 32.
  • FIG. 4 shows different degrees of modulation of a higher-frequency carrier with a low-frequency signal. This illustration is taken from the «Great Broadcasting Guide by F. Bergtold, 11th edition.
  • the degree of modulation of the auxiliary carrier which changes according to the invention, is again indicated schematically as a function of time.
  • a program type that is specially marked, e.g. B. a traffic announcement, the 57 kHz subcarrier alone with the first identifier, the transmission area or station identification frequency, BK, z. B. 54 Hz modulated to 60% in amplitude, ie the amplitude of the subcarrier fluctuates between 40% and 160% of their unmodulated value.
  • the program type or announcement identifier DK is switched on.
  • the degree of modulation of the subcarrier amplitude caused by the BK drops to 30%, i.e. the fluctuation of the subcarrier amplitude caused by this is now only between 70% and 130% of the unmodulated value, while this modulation is subject to a further fluctuation superimposed on the subcarrier amplitude with the announcement or program type identifier DK, which in turn modulates the subcarrier with 60%, so that the subcarrier amplitude oscillates overall between 10% and 190 0/0 of the unmodulated value.
  • both switching stages 10, 11 are switched back, whereby the first described state is restored.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmitters (AREA)
  • Circuits Of Receivers In General (AREA)
  • Near-Field Transmission Systems (AREA)

Claims (13)

1. Emetteur d'ondes métriques (1, 2, 3, 4) prévu pour un système de radiodiffusion, et qui est modulé en fréquence avec une bande de base, comprenant une sous-porteuse à 57 kHz, cet émetteur diffusant pendant et/ou entre les programmes des caractéristiques supplémentaires sous forme de modulations d'amplitudes de la sous-porteuse 57 kHz, avec un modulateur d'amplitudes (6) pour la sous-porteuse 57 kHz, et qui, tout au moins entre les programmes, module en amplitudes cette sous-porteuse jusqu'à plus de 50 % avec une première caractéristique de zone (BK) associée à la zone d'émission ou la station, et qui pendant des types de programme déterminés module en amplitudes cette porteuse avec une seconde caractéristique (DK) associée aux types de programme, le degré de modulation total de la sous-porteuse pendant la durée des types de programmes déterminée ne dépassant pas en pratique 90 %, émetteur caractérisé en ce que pour la durée de la modulation avec la seconde caractéristique (DK) le degré de modulation de la sous-porteuse est réduit par la première caractéristique (BK).
2. Emetteur d'ondes métriques selon la revendication 1, caractérisé en ce que le degré de modulation de la sous-porteuse réduit par la première caractéristique (BK) est inférieur à 50 %.
3. Emetteur d'ondes métriques selon revendication 1 ou 2, caractérisé en ce que le degré de modulation de la sous-porteuse réduit par la première caractéristique (BK) atteint 50% du degré de modulation non réduit.
4. Emetteur d'ondes métriques selon revendication 1, 2 ou 3, caractérisé en ce que le modulateur (6) module la sous-porteuse pendant la durée des programmes déterminés avec la seconde caractéristique (DK) avec un degré de modulation supérieur à 40 %.
5. Emetteur d'ondes métriques selon la revendication 4, caractérisé en ce que le modulateur (6) module la sous-porteuse pendant la durée des programmes déterminée avec la première caractéristique (BK) jusqu'à 30% et avec la seconde caractéristique (BK) jusqu'à 60 %.
6. Emetteur d'ondes métriques selon une des revendications 1 à 5, caractérisé en ce qu'il comporte deux diviseurs (8, 9) associés aux deux caractéristiques (BK, DK), qui délivrent les caractéristiques qui leur sont associées par division par un nombre entier à partir de la fréquence de la sous-porteuse.
7. Emetteur d'ondes métriques selon la revendication 6, caractérisé en ce que les diviseurs (8, 9) sont constitués d'étages diviseurs (8', 9') avec des rapports de division susceptibles d'être sélectionnés, et de diviseurs modulo-16 (21, 22) branchés respectivement à leur suite, tandis qu'à la suite de chaque diviseur modulo-16 sont branchés en série, un générateur de tension échelonnée (23, 24) et un filtre passe-bas (25, 26).
8. Emetteur d'ondes métriques selon revendication 6 ou 7, caractérisé en ce que les rapports de division du diviseur DK (8) sont prédéfinis de façon que les deuxièmes caractéristiques (DK) se situent dans une zone de fréquence au-dessus du second harmonique de la fréquence du réseau.
9. Emetteur d'ondes métriques selon revendication 6 ou 7, caractérisé en ce que les rapports de division du diviseur DK (8) sont prédéfinis de façon que les secondes caractéristiques (DK) se raccordent à la zone de fréquence de la fréquence limite inférieure des types de programme.
10. Emetteur d'ondes métriques selon une des revendications 6 à 9 caractérisé en ce que les rapports de division des deux diviseurs (8, 9) sont prédéfinis de façon que les fréquences harmoniques les plus élevées des premières caractéristiques (BK) se situent entre les secondes caractéristiques (DK).
11. Emetteur d'ondes métriques selon une des revendications 6 à 10, caractérisé en ce que les rapports de division du diviseur DK (8) sont prédéfinis de façon que l'une des secondes caractéristiques (DK) se situe à 142 Hz.
12. Emetteur d'ondes métriques selon une des revendications 6 à 10, caractérisé en ce que les rapports de division du diviseur DK (8) sont prédéfinis de façon que l'une des secondes caractéristiques (DK) se situe à 170 Hz.
13. Emetteur d'ondes métriques selon une des précédentes revendications 1 à 12, caractérisé en ce que chaque diviseur (8, 9) est relié par l'intermédiaire d'un étage de commutation (10, 11) à une entrée qui lui est associée (DK, BK) d'un étage totalisateur (30), chaque étage de commutation (10, 11) comprenant un amplificateur de séparation (28, 29) dont le signal de sortie module la sous-porteuse à 60 % en amplitude, l'étage de commutation (10) venant à la suite du diviseur pour la première caractéristique (BK) comprenant un diviseur de tension branché en amont de l'entrée de l'amplificateur de séparation et constitué de deux résistances identiques (12, 13), tandis que l'autre étage de commutation (11) comprend un contacteur, et que les deux étages de commutation (10, 11) sont susceptibles d'être commandés en synchronisme.
EP82100827A 1981-05-27 1982-02-05 Emetteur-UHF pour un système de radio-diffusion d'informations routières Expired EP0065616B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82100827T ATE14807T1 (de) 1981-05-27 1982-02-05 Ukw-sender fuer ein verkeh rsrundfunkuebertragungssystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3121087 1981-05-27
DE3121087A DE3121087C2 (de) 1981-05-27 1981-05-27 UKW-Sender

Publications (2)

Publication Number Publication Date
EP0065616A1 EP0065616A1 (fr) 1982-12-01
EP0065616B1 true EP0065616B1 (fr) 1985-08-07

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EP82100827A Expired EP0065616B1 (fr) 1981-05-27 1982-02-05 Emetteur-UHF pour un système de radio-diffusion d'informations routières

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US (1) US4584708A (fr)
EP (1) EP0065616B1 (fr)
JP (1) JPS57199348A (fr)
AT (1) ATE14807T1 (fr)
BR (1) BR8202129A (fr)
CA (1) CA1173507A (fr)
DE (1) DE3121087C2 (fr)
ES (1) ES8304388A1 (fr)
MX (1) MX150247A (fr)
ZA (1) ZA822253B (fr)

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US4633198A (en) * 1986-03-12 1986-12-30 The United States Of America As Represented By The Secretary Of The Air Force Flexible (multi-mode) waveform generator
US5014340A (en) * 1986-10-21 1991-05-07 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Emergency locating transmitter
FR2607769B1 (fr) * 1986-12-08 1989-02-03 Alsthom Systeme de transmission bidirectionnel d'informations entre une station au sol et une station sur un vehicule ferroviaire
US5134719A (en) * 1991-02-19 1992-07-28 Mankovitz Roy J Apparatus and methods for identifying broadcast audio program selections in an FM stereo broadcast system
US5119503A (en) * 1991-02-19 1992-06-02 Mankovitz Roy J Apparatus and methods for broadcasting auxiliary data in an FM stereo broadcast system
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US5428610A (en) * 1992-11-10 1995-06-27 World Communication Ventures, Inc. FM radio system employing time shared wide SCA for digital data band
KR960014217B1 (ko) * 1993-01-21 1996-10-14 삼성전자 주식회사 스테레오와 듀얼 음성 인식 회로
RU2110155C1 (ru) * 1993-07-12 1998-04-27 Акционерное общество "Тейвас" Способ передачи дополнительной информации в системе укв-вещания
US5625882A (en) * 1994-03-01 1997-04-29 Motorola, Inc. Power management technique for determining a device mode of operation
RU2108000C1 (ru) * 1994-09-28 1998-03-27 Акционерное общество закрытого типа "Тейвас" Устройство для передачи дополнительной информации по каналу укв-вещания
RU2107999C1 (ru) * 1994-09-28 1998-03-27 Акционерное общество закрытого типа "Тейвас" Способ передачи дополнительной информации по каналу укв-вещания
US5583866A (en) * 1994-12-05 1996-12-10 Motorola, Inc. Method for delivering broadcast packets in a frequency hopping local area network
US20010055320A1 (en) * 1994-12-15 2001-12-27 Pierzga Wayne Francis Multiplex communication
US7902627B2 (en) 2004-06-03 2011-03-08 Silicon Laboratories Inc. Capacitive isolation circuitry with improved common mode detector
US8198951B2 (en) * 2004-06-03 2012-06-12 Silicon Laboratories Inc. Capacitive isolation circuitry
US7302247B2 (en) * 2004-06-03 2007-11-27 Silicon Laboratories Inc. Spread spectrum isolator
US8441325B2 (en) 2004-06-03 2013-05-14 Silicon Laboratories Inc. Isolator with complementary configurable memory
US8072909B2 (en) * 2004-11-15 2011-12-06 Applied Voice & Speech Technologies, Inc. Apparatus and method for notification of a party in a telephone conference
US8451032B2 (en) 2010-12-22 2013-05-28 Silicon Laboratories Inc. Capacitive isolator with schmitt trigger

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Also Published As

Publication number Publication date
ES512550A0 (es) 1983-02-16
ZA822253B (en) 1983-02-23
ATE14807T1 (de) 1985-08-15
ES8304388A1 (es) 1983-02-16
CA1173507A (fr) 1984-08-28
JPS57199348A (en) 1982-12-07
DE3121087C2 (de) 1983-12-01
BR8202129A (pt) 1983-03-22
US4584708A (en) 1986-04-22
MX150247A (es) 1984-04-04
DE3121087A1 (de) 1982-12-30
EP0065616A1 (fr) 1982-12-01

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