WO2004042957A1 - Radio broadcast receiver with diversity function - Google Patents

Radio broadcast receiver with diversity function Download PDF

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Publication number
WO2004042957A1
WO2004042957A1 PCT/EP2003/011860 EP0311860W WO2004042957A1 WO 2004042957 A1 WO2004042957 A1 WO 2004042957A1 EP 0311860 W EP0311860 W EP 0311860W WO 2004042957 A1 WO2004042957 A1 WO 2004042957A1
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WO
WIPO (PCT)
Prior art keywords
signal
signals
tuner
playback
radio receiver
Prior art date
Application number
PCT/EP2003/011860
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German (de)
French (fr)
Inventor
Christoph Benz
Dieter Jurzitza
Andreas Körner
Original Assignee
Harman/Becker Automotive Systems 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
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Application filed by Harman/Becker Automotive Systems Gmbh filed Critical Harman/Becker Automotive Systems Gmbh
Publication of WO2004042957A1 publication Critical patent/WO2004042957A1/en

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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
    • H04B7/12—Frequency diversity
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0058—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means
    • H03J1/0083—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means using two or more tuners
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1646—Circuits adapted for the reception of stereophonic signals

Definitions

  • Radio receivers with a frequency diversity function compare the reception quality of a radio program at several reception frequencies according to specified quality criteria and select a reception frequency that is rated as optimal for playback. For this purpose, they generally have at least one search tuner for comparing the quality of the received signal at the multiple received frequencies and one tuned to the respectively selected received frequency
  • Play tuner whose output signal is processed. Furthermore, radio receivers with antenna diversity function are known, which accordingly receive the reception quality of a radio program via several antennas and evaluate and select an antenna as optimal.
  • the invention has for its object to provide a radio receiver with a diversity function that enables a uniform reproduction of a radio program with different settings. This should advantageously be possible with relatively little additional effort.
  • the radio program signals are thus different settings - ie receiving frequencies (or radio stations) in the case of frequency diversity and / or antennas with antenna diversity - corrected in a suitable manner to avoid level jumps when changing.
  • the correction factors can in particular be derived from the power values of the respective ones formed by time averaging
  • FIG. 1 shows a block diagram of a radio receiver according to the invention
  • FIG. 2 shows a block diagram of a section of the control device used in FIG. 1.
  • a first MPX signal MPX1 and a second MPX signal MPX2 are output by a playback tuner 3 from a broadcast reception signal received by an antenna 2.
  • the playback tuner 3 is set to a selected reception frequency, while the search tuner 4 has the n different reception frequencies
  • Radio program goes through.
  • the signals MPX1, MPX2, a first quality signal S1 of the playback tuner 3 and a second quality signal S2 of the search tuner 4 are fed to a control device 5.
  • the quality signals are compared with one another in the control device 5, from which a channel selection signal S3 is determined and sent to the playback tuner 3 is output to set the selected playback frequency.
  • the MPX signals can be decoded via a decoder 7 (or two parallel decoder devices) and the two sum signals L + R can be recorded by a device 8 for determining correction factors.
  • the device 8 can use both the sum signal (L + R) ⁇ of the multiplex signal MPX1 from the playback tuner and of the multiplex signal MPX2 from the search tuner 4.
  • the device 8 determines the correction factors a k in the manner described above and outputs the respective current correction factor to a multiplier 9, which multiplies the sum signal (L + R) ⁇ and the auxiliary signal (LR) i accordingly by this correction factor.
  • the device 8 advantageously has an AD converter which subsamples the sum signals L + R.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention relates to a radio broadcast receiver with diversity function, in particular, a frequency diversity function. According to the invention, a smooth reproduction of a radio broadcast programme with differing reception frequencies may be achieved, whereby the radio broadcast receiver at least comprises: a reproduction tuner (3), for reception of a radio broadcast receiver signal and output of an audio signal (MPX1) at a reproduction receiver frequency, a controller (5), for reception of the audio signal from the reproduction tuner (3) and output of an adjustment signal (S3) for adjusting the reproduction reception frequency of the reproduction tuner (3) and/or an antenna. The controller determines correction factors (ak) for the audio signals (MPX1, MPX2) for several settings, multiplies the audio signal (MPX1) of the selected setting or signals derived therefrom ((L+R)1 (L-R)1) with the corresponding correction factor and provides a corrected audio signal (S4).

Description

Rundfunkempfänger mit Diversity-FunktionRadio receiver with diversity function
Rundfunkempfänger mit Frequenzdiversity-Funktion vergleichen die Empfangsqualität eines Radioprogramms bei mehreren Empfangsfrequenzen nach vorgegebenen Qualitätskriterien und wählen eine als optimal bewertete Empfangsfrequenz zur Wiedergabe aus. Hierzu weisen sie im allgemeinen mindestens einen Such-Tuner zum Vergleichen der Qualität des Empfangssignals bei den mehreren Empfangsfrequenzen und einen auf die jeweils ausgewählte Empfangsfrequenz eingestelltenRadio receivers with a frequency diversity function compare the reception quality of a radio program at several reception frequencies according to specified quality criteria and select a reception frequency that is rated as optimal for playback. For this purpose, they generally have at least one search tuner for comparing the quality of the received signal at the multiple received frequencies and one tuned to the respectively selected received frequency
Wiedergabe-Tuner auf, dessen Ausgangssignal weiterverarbeitet wird. Weiterhin sind Rundfunkempfänger mit Antennendiversity- Funktion bekannt, die entsprechend die Empfangsqualität eines Radioprogramms über mehrere Antennen empfangen und eine Antenne als optimal bewerten und auswählen.Play tuner whose output signal is processed. Furthermore, radio receivers with antenna diversity function are known, which accordingly receive the reception quality of a radio program via several antennas and evaluate and select an antenna as optimal.
Aufgrund von unterschiedlichen Modulationsgraden und der Antennensignalabhängigkeit des NF-Pegels am Ausgang des Rundfunkempfängers treten beim Wechsel zwischen unterschiedlichen Empfangsfrequenzen bzw. AntennenDue to different degrees of modulation and the antenna signal dependence of the LF level at the output of the radio receiver, when switching between different reception frequencies or antennas
Pegelsprünge auf, die die Audiowiedergabe stören können.Level jumps that can interfere with audio playback.
Der Erfindung liegt die Aufgabe zugrunde, einen Rundfunkempfänger mit Diversity-Funktion zu schaffen, der eine gleichmäßige Wiedergabe eines Rundfunkprogramms bei unterschiedlichen Einstellungen ermöglicht. Dies soll vorteilhafterweise mit relativ geringem zusätzlichen Aufwand möglich sein.The invention has for its object to provide a radio receiver with a diversity function that enables a uniform reproduction of a radio program with different settings. This should advantageously be possible with relatively little additional effort.
Diese Aufgabe wird gelöst durch einen Rundfunkempfänger nach Anspruch 1. Die Unteransprüche beschreiben bevorzugte Weiterbildungen .This object is achieved by a radio receiver according to claim 1. The subclaims describe preferred further developments.
Erfindungsgemäß werden somit die Radioprogrammsignale verschiedener Einstellungen - d.h. Empfangsfrequenzen (bzw. Rundfunkstationen) bei Frequenzdiversity und/oder Antennen bei Antennendiversity - in geeigneter Weise korrigiert, um Pegelsprünge beim Wechsel zu vermeiden.According to the invention, the radio program signals are thus different settings - ie receiving frequencies (or radio stations) in the case of frequency diversity and / or antennas with antenna diversity - corrected in a suitable manner to avoid level jumps when changing.
Die Korrekturfaktoren können insbesondere aus durch zeitliche Mittelung gebildeten Leistungswerten der jeweiligenThe correction factors can in particular be derived from the power values of the respective ones formed by time averaging
Einstellungen gebildet werden. Hierzu kann vorteilhafterweise bei Empfang eines UKW-Stereosignals lediglich das Summensignal ausgewertet werden, wodurch der Berechnungsaufwand gering gehalten wird. Die Korrektur erfolgt anschließend aus dem ermittelten Korrekturfaktor auch für die Hilfssignale. Zur besseren Datenverarbeitung kein vorteilhafterweise eine Analog-Digital-Wandlung des analogen NF-Signals bzw. Summensignals vorgenommen werden.Settings are formed. For this purpose, advantageously only the sum signal can be evaluated when a VHF stereo signal is received, as a result of which the calculation effort is kept low. The correction is then made from the determined correction factor also for the auxiliary signals. For better data processing, advantageously no analog-to-digital conversion of the analog LF signal or sum signal is carried out.
Die Erfindung wird im folgenden anhand der beiliegendenThe invention will now be described with reference to the accompanying
Zeichnung an einigen Ausführungsformen näher erläutert. Es zeigen:Drawing explained in some embodiments. Show it:
Fig. 1 ein Blockdiagramm eines erfindungsgemäßen Rundfunkempfängers;1 shows a block diagram of a radio receiver according to the invention;
Fig. 2 ein Blockdiagramm eines Ausschnitts der in Fig. 1 verwendeten Steuereinrichtung.FIG. 2 shows a block diagram of a section of the control device used in FIG. 1.
Aus einem von einer Antenne 2 aufgenommenen Rundfunk- Empfangssignal wird von einem Wiedergabe-Tuner 3 ein erstes MPX-Signal MPXl und von einem Such-Tuner 4 ein zweites MPX- Signal MPX2 ausgegeben. Der Wiedergabe-Tuner 3 ist auf eine ausgewählte Empfangsfrequenz eingestellt, während der Suchtuner 4 die n verschiedenen Empfangsfrequenzen einesA first MPX signal MPX1 and a second MPX signal MPX2 are output by a playback tuner 3 from a broadcast reception signal received by an antenna 2. The playback tuner 3 is set to a selected reception frequency, while the search tuner 4 has the n different reception frequencies
Radioprogramms durchläuft. Die Signale MPXl, MPX2, ein erstes Qualitätssignal Sl des Wiedergabe-Tuners 3 und ein zweites Qualitätssignal S2 des Such-Tuners 4 werden einer Steuereinrichtung 5 zugeführt. In der Steuereinrichtung 5 werden die Qualitätssignale miteinander verglichen, woraus ein Kanalwahlsignal S3 ermittelt und an den Wiedergabetuner 3 zur Einstellung der jeweils ausgewählten Wiedergabefrequenz ausgegeben wird.Radio program goes through. The signals MPX1, MPX2, a first quality signal S1 of the playback tuner 3 and a second quality signal S2 of the search tuner 4 are fed to a control device 5. The quality signals are compared with one another in the control device 5, from which a channel selection signal S3 is determined and sent to the playback tuner 3 is output to set the selected playback frequency.
Erfindungsgemäß ermittelt die Steuereinrichtung 5 aus den Summensignalen L+R der Multiplexsignale MPXl, MPX2 fortlaufend durch eine Integration über einen vorgegebenen Zeitraum NF-Leistungsmittel p , k= l...n. Diese Bestimmung basiert auf einem Algorithmus, der eine zeitliche Gewichtung und Mittelung der Momentanleistung des NF-Signals bei der jeweiligen Empfangsfrequenz vornimmt. Hieraus werdenAccording to the invention, the control device 5 continuously determines NF power resources p, k = l ... n from the sum signals L + R of the multiplex signals MPX1, MPX2 by integration over a predetermined period. This determination is based on an algorithm that carries out a temporal weighting and averaging of the instantaneous power of the LF signal at the respective reception frequency. From this become
Korrekturfaktoren ak= g(Pk) bestimmt, die eine Normalisierung des NF-Signalpegels bei der jeweiligen Empfangsfrequenz ermöglichen.Correction factors a k = g (P k ) are determined which enable the NF signal level to be normalized at the respective reception frequency.
Gemäß der Ausführungsform von Fig. 2 können hierzu die MPX- Signale über einen Decoder 7 (bzw. zwei parallele Decodereinrichtungen) decodiert werden und die beiden Summensignale L+R von einer Einrichtung 8 zum Ermitteln von Korrekturfaktoren aufgenommen werden. Die Einrichtung 8 kann hierbei sowohl das Summensignal (L+R)ι des Multiplexsignals MPXl vom Wiedergabe-Tuner als auch des Multiplexsignals MPX2 vom Such-Tuner 4 verwenden. Die Einrichtung 8 ermittelt in oben beschriebener Weise die Korrekturfaktoren ak und gibt den jeweils aktuellen Korrekturfaktor an einen Multiplizierer 9, der das Summensignal (L+R)ι und das Hilfssignal (L-R) i entsprechend mit diesem Korrekturfaktor multipliziert. Die Einrichtung 8 weist vorteilhafterweise einen AD-Wandler auf, der die Summensignale L+R unterabtastet. According to the embodiment of FIG. 2, the MPX signals can be decoded via a decoder 7 (or two parallel decoder devices) and the two sum signals L + R can be recorded by a device 8 for determining correction factors. The device 8 can use both the sum signal (L + R) ι of the multiplex signal MPX1 from the playback tuner and of the multiplex signal MPX2 from the search tuner 4. The device 8 determines the correction factors a k in the manner described above and outputs the respective current correction factor to a multiplier 9, which multiplies the sum signal (L + R) ι and the auxiliary signal (LR) i accordingly by this correction factor. The device 8 advantageously has an AD converter which subsamples the sum signals L + R.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
RundfunkempfängerRadio receiver
2 Antenne2 antenna
Wiedergabe-TunerPlay tuner
Such-TunerSearch tuner
Steuervorrichtungcontrol device
Lautsprecherspeaker
7 Decoder7 decoders
Einrichtung zum Ermitteln von KorrekturfaktorenDevice for determining correction factors
Multiplizierermultipliers
MPXl Stereo-Multiplexsignal von 3MPXl stereo multiplex signal from 3
MPX2 Stereo-Multiplexsignal von 4MPX2 stereo multiplex signal from 4
( L+R) ! Summensignal von 3 ( L+R) 2 Summensignal von 4 ( L-R) ι Hilfssignal ak Korrekturfaktor S 4 korrigiertes demoduliertes NF-Signal (L + R) ! Sum signal of 3 (L + R) 2 Sum signal of 4 (LR) ι auxiliary signal a k correction factor S 4 corrected demodulated LF signal

Claims

Patentansprüche claims
1. Rundfunkempfänger mit Diversity-Funktion, der mindestens aufweist : einen Wiedergabe-Tuner (3) zur Aufnahme eines Rundfunk- Empfangssignals und Ausgabe eines NF-Signals (MPXl) bei einer Wiedergabe-Empfangsfrequenz, und eine Steuereinheit (5) zur Aufnahme des NF-Signals des Wiedergabe-Tuners (3) und Ausgabe eines Einstellsignals1. Radio receiver with diversity function, which has at least: a playback tuner (3) for receiving a radio reception signal and output of an AF signal (MPXl) at a playback reception frequency, and a control unit (5) for recording the NF -Signal of the playback tuner (3) and output of a setting signal
(S3) zur Einstellung der Wiedergabe-Empfangsfrequenz des Wiedergabe-Tuners (3) und/oder einer von mehreren Antennen, wobei die Steuereinrichtung Korrekturfaktoren (ak) für die NF-Signale (MPXl, MPX2) mehrerer Einstellungen ermittelt, das NF-Signal (MPXl) der gewählten Einstellung oder hieraus gebildete Signale ( (L+R) x (L- R)ι) mit dem entsprechenden Korrekturfaktor multipliziert und ein korrigiertes NF-Signal (S4) ausgibt.(S3) for setting the playback reception frequency of the playback tuner (3) and / or one of several antennas, the control device determining correction factors (a k ) for the LF signals (MPX1, MPX2) of several settings, the LF signal (MPXl) of the selected setting or signals formed therefrom ((L + R) x (L- R) ι) multiplied by the corresponding correction factor and outputs a corrected LF signal (S4).
2. Rundfunkempfänger nach Anspruch 1, dadurch gekennzeichnet, dass er weiterhin einen Such-Tuner (4) zur Aufnahme des Rundfunk-Empfangssignals und Ausgabe eines zweiten NF-Signals (MPX2) aufweist, wobei die Steuereinheit (5) das NF-Signal des Such-Tuners (4) aufnimmt und als Wahlsignal ein Kanalwahlsignal (S3) zur Einstellung der Wiedergabe-Empfangsfrequenz des Wiedergabe-Tuners (3) ausgibt, Korrekturfaktoren (ak) für die NF-Signale (MPXl, MPX2) bei den jeweils eingestellten Empfangsfrequenzen ermittelt und das NF- Signal (MPXl) der Wiedergabe-Empfangsfrequenz oder hieraus gebildete Signale ( (L+R) i (L-R)χ) mit dem entsprechenden Korrekturfaktor multipliziert und das korrigiertes NF-Signal (S4) ausgibt. Rundfunkempfänger nach Anspruch 2, dadurch gekennzeichnet, dass die Steuereinrichtung (5) von den Tunern (3, 4) ausgegebene Qualitätssignale (Sl, S2) aufnimmt und aus dem Vergleich dieser Qualitätssignale das Kanalwahlsignal (S3) ermittelt und an den Wiedergabe-Tuner (3) ausgibt.2. Radio receiver according to claim 1, characterized in that it further comprises a search tuner (4) for receiving the radio reception signal and outputting a second LF signal (MPX2), the control unit (5) the LF signal of the search -Tuners (4) and outputs as a selection signal a channel selection signal (S3) for setting the playback reception frequency of the playback tuner (3), correction factors (ak) for the AF signals (MPXl, MPX2) determined at the respectively set reception frequencies and multiplies the LF signal (MPXl) of the reproduction reception frequency or signals formed therefrom ((L + R) i (LR) χ) by the corresponding correction factor and outputs the corrected LF signal (S4). Radio receiver according to claim 2, characterized in that the control device (5) receives quality signals (S1, S2) output by the tuners (3, 4) and determines the channel selection signal (S3) from the comparison of these quality signals and sends them to the playback tuner (3 ) issues.
Rundfunkempfänger nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Steuereinrichtung jeweils fortlaufend Korrekturfaktoren (ak) derRadio receiver according to claim 2 or 3, characterized in that the control device in each case continuously correction factors (a k )
Empfangsfrequenzen des Wiedergabe-Tuners (3) und Such- Tuners (4) ermittelt und abspeichert.Receiving frequencies of the playback tuner (3) and search tuner (4) determined and saved.
Rundfunkempfänger nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Steuereinrichtung (5) aus den NF-Signalen (MPXl, MPX2) oder durch Demodulation gebildeten Signalen ((L+R) 1,2) fortlaufend jeweils Leistungswerte (pk) ermittelt und aus den Leistungswerten (pk) , vorzugsweise durch eine Normierung, die Korrekturfaktoren (ak) ermittelt.Radio receiver according to one of the preceding claims, characterized in that the control device (5) continuously determines power values (p k ) from the LF signals (MPXl, MPX2) or signals formed by demodulation ((L + R) 1 , 2) the correction factors (a k ) are determined from the power values (p k ), preferably by standardization.
Rundfunkempfänger nach Anspruch 5, dadurch gekennzeichnet, dass die Leistungswerte (pk) durch eine zeitliche Gewichtung und Mittelung der Momentanleistung des NF-Signals, vorzugsweise über einen vorgegebenen Zeitraum, ermittelt werden.Radio receiver according to claim 5, characterized in that the power values (p k ) are determined by weighting and averaging the instantaneous power of the LF signal, preferably over a predetermined period of time.
Rundfunkempfänger nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die NF-Signale Stereo- Multiplexsignale (MPX) sind und die SteuereinrichtungRadio receiver according to one of the preceding claims, characterized in that the NF signals are stereo multiplex signals (MPX) and the control device
(5) aus den Summensignalen ( (L+R) l r (L+R) 2) der Stereo-(5) from the sum signals ((L + R) lr (L + R) 2 ) of the stereo
Multiplexsignale die Korrekturfaktoren (ak) ermittelt.Multiplex signals the correction factors (a k ) determined.
Rundfunkempfänger nach Anspruch 7, dadurch gekennzeichnet, dass die Steuereinrichtung (5) eineRadio receiver according to claim 7, characterized in that the control device (5) a
Decodereinrichtung (7) zum Decodieren der aufgenommenen MPX-Signale (MPXl, MPX2) und Ausgeben der Summensignale ( (L+R) 1,2) #■ eine Korrekturfaktor-Ermittlungseinrichtung (8) zur Aufnahme der Summensignale und Ermitteln derDecoder device (7) for decoding the recorded MPX signals (MPX1, MPX2) and outputting the sum signals ((L + R) 1,2) # ■ a correction factor determining device (8) for receiving the sum signals and determining the
Korrekturfaktoren (ak) und einen Multiplizierer (9) zumCorrection factors (a k ) and a multiplier (9) for
Multiplizieren des ersten Summensignals ( (L+R) 1) und eines ersten Hilfssignals ((L-R)ι) mit dem entsprechenden Korrekturfaktor (ak) und Ausgabe der korrigierten NF-Signale (S4) aufweist.Multiplying the first sum signal ((L + R) 1 ) and a first auxiliary signal ((LR) ι) by the corresponding correction factor (a k ) and output of the corrected LF signals (S4).
Rundfunkempfänger nach Anspruch 8, dadurch gekennzeichnet, dass die Korrekturfaktor- Ermittlungseinrichtung (8) einen Analog-Digital-Wandler zur Digitalisierung der Summensignale durch Unterabtastung aufweist. Radio receiver according to claim 8, characterized in that the correction factor determining device (8) has an analog-digital converter for digitizing the sum signals by undersampling.
PCT/EP2003/011860 2002-11-04 2003-10-24 Radio broadcast receiver with diversity function WO2004042957A1 (en)

Applications Claiming Priority (2)

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DE10251186.1 2002-11-04
DE2002151186 DE10251186B4 (en) 2002-11-04 2002-11-04 Radio receiver with diversity function

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2701177A1 (en) * 1993-02-01 1994-08-05 Leprince Guillaume Device for tracking radio frequency stations
EP0637878A2 (en) * 1993-08-02 1995-02-08 Harris Corporation Space diversity combiner
DE19830608A1 (en) * 1998-07-09 2000-01-20 Becker Gmbh Car radio receiver with background tuner for determining station with best reception quality

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19905157B4 (en) * 1999-02-08 2006-06-29 Harman Becker Automotive Systems (Becker Division) Gmbh Radio receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2701177A1 (en) * 1993-02-01 1994-08-05 Leprince Guillaume Device for tracking radio frequency stations
EP0637878A2 (en) * 1993-08-02 1995-02-08 Harris Corporation Space diversity combiner
DE19830608A1 (en) * 1998-07-09 2000-01-20 Becker Gmbh Car radio receiver with background tuner for determining station with best reception quality

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DE10251186B4 (en) 2006-11-23

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