DE4105599C1 - Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency - Google Patents

Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency

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Publication number
DE4105599C1
DE4105599C1 DE19914105599 DE4105599A DE4105599C1 DE 4105599 C1 DE4105599 C1 DE 4105599C1 DE 19914105599 DE19914105599 DE 19914105599 DE 4105599 A DE4105599 A DE 4105599A DE 4105599 C1 DE4105599 C1 DE 4105599C1
Authority
DE
Germany
Prior art keywords
oscillator
mixer
stage
auxiliary
car radio
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
DE19914105599
Other languages
German (de)
Inventor
Karl-Peter 3200 Hildesheim De Strauss
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.)
Robert Bosch 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 DE19914105599 priority Critical patent/DE4105599C1/en
Application granted granted Critical
Publication of DE4105599C1 publication Critical patent/DE4105599C1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/084—Equal gain combining, only phase adjustments

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Transmitters (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The diversity device (2) for a VHF car radio (1) drives several car aerials (3) connected in different positions on the same vehicle, to process all the antenna signals simultaneously. A preamplification and a mixing stage (18) are connected to each antenna (3). The output signals of the mixing stage (18) are vectorially added in a summation stage via controllable phase rotating members. The second signal input to the mixing stage (18) is derived from an auxiliary oscillator (9). The oscillator (9) is synchronised through the interference outputs of the radio mixer oscillator (6) at the output of the radio (1), via an automatic search function (13). The output of the summation stage (19) is fed back via the auxiliary oscillator (9) to a feed back mixer (15). USE/ADVANTAGE - Enables readily available car radios to be modified to operate to process signals simultaneously from several antennas.

Description

Das Schutzrecht betrifft ein neues Diversityvorsatzgerät für ein UKW-Autoradio der in der DE 35 10 580 A1 beschriebenen Art. Diese Autoradios sind zum Betrieb an mehreren, an denselben Fahrzeugen an unterschiedlichen Stellen angebrachten Autoantennen ausgelegt und für die gleichzeitige Auswertung aller Antennensignale bestimmt. Entsprechend den Angaben in der DE 35 10 580 A1 sind jeder Antenne ein Vorkreis und eine Mischstufe nachgeschaltet. Die Ausgangssignale der Mischstufe werden über steuerbare Phasendrehglieder in einer vektoriellen Addierstufe überlagert.The property right relates to a new diversity attachment for an FM car radio in the DE 35 10 580 A1 described type. These car radios are for operation on several, on the same vehicles on different Attached car antennas designed and for the simultaneous evaluation of all antenna signals determined. Corresponding the details in DE 35 10 580 A1 are each antenna a pre-circuit and a mixing stage downstream. The output signals the mixing stage are controlled via phase rotators superimposed in a vectorial adder.

Der Erfindung liegt die Aufgabe zugrunde, auch bereits vorhandene Autoradios für eine solche Betriebsweise nachzurüsten.The invention is based, too existing car radios for such a mode of operation retrofit.

Die Erfindung löst diese Aufgabe mit dem in Anspruch 1 gekennzeichneten Mitteln.The invention solves this problem with that characterized in claim 1 Means.

Anhand der Zeichnung wird ein Ausführungsbeispiel der Erfindung näher erläutert.An embodiment of the invention is shown in the drawing explained in more detail.

Das bereits vorhandene, übliche Autoradio 1 arbeitet auf einer Zwischenfrequenz von 10,7 MHz. Dieses Autoradio wird über ein Vorschaltkästchen 2 mit den Antennen 3 verbunden.The already existing, standard car radio 1 operates at an intermediate frequency of 10.7 MHz. This car radio is connected to the antennas 3 via a switch box 2 .

An dem Antenneneingang 4 des Autoradios wird der Eingangsstufe 5 des Autoradios das übliche Eingangssignal, die FM-modulierte Trägerwelle des zu empfangenden Senders angeboten. Zugleich ist an dieser Stelle jedoch auch eine Störstrahlung des Mischoszillators 6 in der Eingangsstufe des Autoradios abnehmbar. Diese Störstrahlung wird über einen abstimmbaren Bandpaß 7 Hilfsmischstufe 8 zugeführt, deren zweites Eingangssignal von einem abstimmbaren Hilfsoszillator 9 stammt. At the antenna input 4 of the car radio, the input stage 5 of the car radio is offered the usual input signal, the FM-modulated carrier wave of the transmitter to be received. At the same time, however, interference radiation from the mixing oscillator 6 in the input stage of the car radio can also be removed. This interference radiation is fed via a tunable bandpass filter 7 to the auxiliary mixer 8 , the second input signal of which comes from a tunable auxiliary oscillator 9 .

Das Ausgangssignal der in der Hilfsmischstufe 8 erzeugten Hilfszwischenfrequenz wird über einen Bandpaß 10 geleitet, danach im Verstärker 11 verstärkt und über einen Diskriminator 12 in eine Suchlaufautomatik 13 als Steuersignal eingegeben. Die Abstimmspannung, die die Suchlaufautomatik 13 erzeugt, steuert zum einen den abstimmbaren Bandpaß 7 im Eingang des Vorschaltkästchens 2, ferner den abstimmbaren Hilfsoszillator 9 und schließlich einen Baustein 14, in dem die Antennensignale, wie eingangs erwähnt, überlagert werden. Das Ausgangssignal des Bausteins 14 wird über einen Rückmischer 15, dem als zweites Signal das Signal des Hilfsoszillators 9 zugeführt ist, und einen mit der Abstimmspannung abstimmbaren Ausgangsbandpaß 16 zur Antennenbuchse 4 des Autoradios geleitet.The output signal of the auxiliary intermediate frequency generated in the auxiliary mixer stage 8 is passed via a bandpass 10 , then amplified in the amplifier 11 and input via a discriminator 12 into an automatic search function 13 as a control signal. The tuning voltage generated by the automatic search function 13 controls the tunable bandpass filter 7 in the input of the upstream box 2 , the tunable auxiliary oscillator 9 and finally a module 14 in which the antenna signals, as mentioned at the beginning, are superimposed. The output signal of the module 14 is passed via a back mixer 15 , to which the signal of the auxiliary oscillator 9 is fed as a second signal, and an output bandpass 16, which can be tuned with the tuning voltage, to the antenna socket 4 of the car radio.

Der Baustein 14 umfaßt für jede Antenne 3 ein abstimmbares Eingangsfilter 17, dessen Abstimmeingang mit dem Ausgang der Suchlaufautomatik 13 verbunden ist. Jedem der Eingangsfilter 17 ist eine Mischstufe 18 nachgeschaltet, der als zweites Signal das Ausgangssignal des Hilfsoszillators 9 zugeführt ist. In dem nicht näher beschriebenen Schaltungsblock 19 werden die Ausgangssignale der Mischstufen 18 in der Phase verschoben und überlagert. Das Ausgangssignal des Schaltungsblocks 19 wird dann, wie bereits beschrieben, im Rückmischer 15 weiterverarbeitet.The module 14 comprises a tunable input filter 17 for each antenna 3 , the tuning input of which is connected to the output of the automatic search function 13 . A mixing stage 18 is connected downstream of each of the input filters 17 , and the output signal of the auxiliary oscillator 9 is supplied as a second signal. In the circuit block 19 not described in detail, the output signals of the mixer stages 18 are shifted in phase and superimposed. The output signal of the circuit block 19 is then further processed in the back mixer 15 , as already described.

Wenn die ZF-Stufe des Autoradios 1 auf einer Zwischenfrequenz fZF von 10,7 MHz arbeitet und der Mischoszillator oberhalb der Empfangsfrequenz fE schwingen soll, dann gilt für die Oszillatorfrequenz fO If the IF stage of the car radio 1 operates at an intermediate frequency f IF of 10.7 MHz and the mixing oscillator is to oscillate above the reception frequency f E , then the oscillator frequency f O applies

fO=fE+fZF .f O = f E + f ZF .

Die als Störstrahlung am Antenneneingang abnehmbare Oszillatorfrequenz fO wird in dem Eingangsbandpaß 7 des Vorschaltkästchens 2 gesiebt. Durch Mischung mit der Frequenz des HilfsoszillatorsThe oscillator frequency f O , which can be removed as interference radiation at the antenna input, is sieved in the input bandpass 7 of the upstream box 2 . By mixing with the frequency of the auxiliary oscillator

fHO=fE+fZF,f HO = f E + f ZF ,

entsteht eine neue Hilfszwischenfrequenza new auxiliary intermediate frequency is created

fHZF=2fZF .f HZF = 2f ZF .

Die Frequenz des Hilfsoszillators fHO wird durch die Suchlaufautomatik 13 bestimmt, die dann zum Stehen kommt, wenn der auf die Hilfszwischenfreqenz fHZF eingestellte Diskriminator 12 einen Nulldurchgang der Hilfs-ZF erkennt. Dann ist fHO=fO, d. h. die Frequenzen des Oszillators 6 und des Hilfsoszillators 9 stimmen überein.The frequency of the auxiliary oscillator f HO is determined by the automatic search function 13 , which comes to a standstill when the discriminator 12 set to the auxiliary intermediate frequency f HZF detects a zero crossing of the auxiliary IF. Then f HO = f O , ie the frequencies of the oscillator 6 and the auxiliary oscillator 9 match.

Der Aufbau der Bandpässe 17, 16 am Fuß der Antenne 3 und vor dem Antenneneingang 4 des Autoradios 1 sind so aufgebaut, daß bei der Abstimmspannung die Empfangsfrequenz fE praktisch nicht gedämpft wird. Mit der Oszillatorfrequenz fHO wird die Trägerfrequenz des Senders fE in der Mischstufe 18 auf eine Zwischenfrequenz fZF-ADA herabgemischt. In dem Schaltblock 19 werden die herabgemischten Antennensignale, wie in der eingangs erwähnten DE 35 10 580 A1 beschrieben ist, überlagert und dann im Rückmischer 15 auf die Trägerfrequenz fE des Senders zurückgemischt.The structure of the bandpass filters 17, 16 at the base of the antenna 3 and in front of the antenna input 4 of the car radio 1 are constructed in such a way that the reception frequency f E is practically not attenuated at the tuning voltage. With the oscillator frequency f HO , the carrier frequency of the transmitter f E is mixed down in the mixer 18 to an intermediate frequency f IF-ADA . In the circuit block 19, the downconverted antenna signals, as described in the aforementioned DE 35 10 580 A1 are superimposed, and then in the rear mixer 15 to the carrier frequency f e of the transmitter back mixed.

Nach Passieren des Bandpasses 16 steht dann die Trägerfrequenz des Senders mit einer regenerierten Modulation am Antenneneingang des vorhandenen Autoradios zur Verfügung.After passing the bandpass 16 , the carrier frequency of the transmitter is then available with regenerated modulation at the antenna input of the existing car radio.

LegendeLegend

 1 Autoradio
 2 Vorschaltkästchen (Vorsatzgerät)
 3 Antennen
 4 Antenneneingang des Autoradios
 5 Eingangsstufe des Autoradios
 6 Mischoszillator des Autoradios
 7 Bandpaß
 8 Hilfsmischstufe
 9 Hilfsoszillator
10 Bandpaß
11 Verstärker
12 Diskriminator
13 Suchlaufautomatik
14 Baustein zur Überlagerung der Antennensignale
15 Rückmischer
16 Ausgangsbandpaß
17 Eingangsfilter
18 Mischstufe
19 Phasenschieber 1 car radio
2 check boxes (front attachment)
3 antennas
4 Antenna input of the car radio
5 entrance level of the car radio
6 Mixing oscillator of the car radio
7 band pass
8 auxiliary mixing stage
9 auxiliary oscillator
10 band pass
11 amplifiers
12 discriminator
13 Automatic search
14 component for superimposing the antenna signals
15 back mixers
16 output band pass
17 input filter
18 mixing stage
19 phase shifters

Claims (2)

1. UKW-Autoradio zum Betrieb an mehreren, an demselben Fahrzeug an unterschiedlichen Stellen angebrachten Autoantennen für die gleichzeitige Auswertung aller Antennensignale, wobei jeder Antenne ein Vorkreis und eine Mischstufe nachgeschaltet ist und das Ausgangssignal der Mischstufen über steuerbare Phasendrehglieder in einer vektoriellen Addierstufe überlagert werden, dadurch gekennzeichnet, daß das zweite Signal für die Mischstufe (18) von einem Hilfsoszillator (9) abgeleitet ist, der durch die am Antenneneingang des Autoradios abnehmbare Störstrahlung des Autoradio-Mischoszillators (6) über eine Suchlaufautomatik (13) synchronisiert ist und daß das Ausgangssignal der Addierstufe (19) in einem Rückmischer (15) mittels der Hilfsoszillatorfrequenz in die trägerfrequente Lage zurückgesetzt wird.1. VHF car radio for operation on several car antennas attached to the same vehicle at different locations for the simultaneous evaluation of all antenna signals, each antenna being followed by a preliminary circuit and a mixing stage and the output signal of the mixing stages being overlaid by controllable phase rotators in a vectorial adder stage, characterized in that the second signal for the mixer stage ( 18 ) is derived from an auxiliary oscillator ( 9 ) which is synchronized by the automatic radiation mixing oscillator ( 6 ) which can be removed at the antenna input of the car radio via an automatic search function ( 13 ) and that the output signal the adder stage ( 19 ) in a back mixer ( 15 ) is reset to the carrier frequency position by means of the auxiliary oscillator frequency. 2. UKW-Autoradio nach Anspruch 1, dadurch gekennzeichnet, daß die Störstrahlung in einer Hilfsmischstufe (8) mit der Frequenz des Hilfsoszillators (9) gemischt wird und daß das Ausgangssignal dieser Hilfsmischstufe über einen auf die Hilfszwischenfrequenz eingestellten Diskriminator (12) eine Suchlaufautomatik (13) steuert.2. FM car radio according to Claim 1, characterized in that the interference radiation is mixed in an auxiliary mixer stage (8) with the frequency of the auxiliary oscillator (9) and that the output signal of the auxiliary mixer stage for a set of the auxiliary intermediate frequency discriminator (12) includes a search priority ( 13 ) controls.
DE19914105599 1991-02-22 1991-02-22 Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency Expired - Lifetime DE4105599C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19914105599 DE4105599C1 (en) 1991-02-22 1991-02-22 Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19914105599 DE4105599C1 (en) 1991-02-22 1991-02-22 Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency

Publications (1)

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DE4105599C1 true DE4105599C1 (en) 1992-09-17

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DE19914105599 Expired - Lifetime DE4105599C1 (en) 1991-02-22 1991-02-22 Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303979A1 (en) * 1993-02-11 1994-08-18 Kolbe & Co Hans Car radio with antenna diversity

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3510580A1 (en) * 1985-03-23 1986-09-25 Blaupunkt-Werke Gmbh, 3200 Hildesheim METHOD AND CIRCUIT FOR IMPROVING THE RECEPTION OF RADIO WAVES

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3510580A1 (en) * 1985-03-23 1986-09-25 Blaupunkt-Werke Gmbh, 3200 Hildesheim METHOD AND CIRCUIT FOR IMPROVING THE RECEPTION OF RADIO WAVES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303979A1 (en) * 1993-02-11 1994-08-18 Kolbe & Co Hans Car radio with antenna diversity

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Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: ROBERT BOSCH GMBH, 70469 STUTTGART, DE

8339 Ceased/non-payment of the annual fee