EP0714222B1 - Processeur de signaux pseudostéréo pour récepteur mobile - Google Patents

Processeur de signaux pseudostéréo pour récepteur mobile Download PDF

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Publication number
EP0714222B1
EP0714222B1 EP95118291A EP95118291A EP0714222B1 EP 0714222 B1 EP0714222 B1 EP 0714222B1 EP 95118291 A EP95118291 A EP 95118291A EP 95118291 A EP95118291 A EP 95118291A EP 0714222 B1 EP0714222 B1 EP 0714222B1
Authority
EP
European Patent Office
Prior art keywords
stereo
signal
circuit
pseudostereo
radio receiver
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
EP95118291A
Other languages
German (de)
English (en)
Other versions
EP0714222A2 (fr
EP0714222A3 (fr
Inventor
Herbert Hetzel
Harald Schöpp
Christoph Benz
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.)
Harman Becker Automotive Systems GmbH
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.)
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Publication date
Application filed by Harman Becker Automotive Systems GmbH filed Critical Harman Becker Automotive Systems GmbH
Publication of EP0714222A2 publication Critical patent/EP0714222A2/fr
Publication of EP0714222A3 publication Critical patent/EP0714222A3/fr
Application granted granted Critical
Publication of EP0714222B1 publication Critical patent/EP0714222B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution

Definitions

  • the invention relates to a mobile radio receiver according to the preamble of claim 1.
  • mobile radios are known in a variety of designs. They show, as far as it is stereo receiving devices, with decreasing reception quality switching from stereo to mono mode. Mono operation does not adequately satisfy the listener's sense of sound. Although almost all mobile radio receivers have the ability to manually adjust the sound parameters such as treble, bass, balance or fader in mono mode, these variations do not create the possibility of a sufficient sound experience comparable to that of stereo reception, especially as these settings make the consciousness of a radio-listening driver unsatisfactory Distracting way from traffic.
  • the invention is taking into account this prior art, the object to provide a mobile radio receiver, which offers the user even under difficult reception conditions without complex operation, a sound experience near the stereo reception.
  • EP-A-0 503 154 discloses a mobile radio receiver with a pseudo stereo circuit which can be activated in music programs in mono. This is subject to binding in the RDS signal with sustained M / S coding (music / voice)
  • the radio receiver shows a circuit for recognizing speech. This detects speech components in the received or demodulated signal and, in the presence of speech, controls the pseudo-stereo circuit in such a way that the processing of the mono signal into a pseudo-stereo signal is prevented.
  • This training makes it possible to make speech signals particularly clear to the listener.
  • speech processing of the mono signal to the pseudo-stereo signal is surprisingly not advantageous, because it suffers the clarity of the speech signal, which is of central importance. Behind it, the sense of sound has to stand back. With this design, the user, without any operation of the device, manages to obtain important information, e.g. To perceive traffic announcements or alarm messages in a particularly understandable form, without sacrificing the special sound perception in music or the like at the same time.
  • the broadcast signal is statistically evaluated on the temporal and frequency characteristics. Based on the evaluation, a reliable statement can be made as to whether the signal is speech or other signals. If the evaluation shows that the signal is a voice signal, then the pseudo-stereo circuit is disabled.
  • the pseudo-stereo circuit is always active when the mobile radio receiver due to the broadcast signal broadcast or due to the current local reception conditions is not able to receive a stereo signal in sufficient quality, resulting in automatic switching from stereo to Mono reception of the radio receiver leads.
  • the unpleasant sound experience of the flat mono signal automatically, that is upgraded to a pleasant spatial and full sound experience due to the pseudo-stereo sound without complex adjustments, which are associated with a dangerous reduction in attention of the driver for traffic.
  • This enhancement allows the motorist to always perceive a largely uniform and pleasant sound experience, which affects his attention much less than the unpleasant dynamic switching between the pleasant stereo operation and the already unpleasant mono operation.
  • the radio receiver is already switched to mono mode at a still possible Stereoempfangslage, which automatically leads to a pseudo-stereo signal without necessary influence of the driver to use the pseudo-stereo circuit and thus for processing the mono signal.
  • the limit is chosen so that a always trouble-free, especially a non-interference reception is certainly possible. It is possible to choose the limit value in each case adapted to the field of application of the mobile radio receiver.
  • a switching unit is provided, which controlled by the quality of the received signal in a defined manner between the stereo signal and the pseudo-stereo signal, which was formed by the pseudo-stereo circuit from the received mono signal switches.
  • An alternative embodiment of the invention shows the switching operation in the form of a cross-fade, which is completed within a period of the order of a second.
  • the crossfading is continuous and not abrupt, which gives the listener the opportunity to get used to the changed sound conditions and thus achieve a pleasant switch from one sound state to the other.
  • This soft crossfading thus represents an optimized and for the listener very pleasant form of switching.
  • An advantageous embodiment of the invention results from the combination of the two different Umschalttamaien by the transition from stereo to pseudo-stereo reception, the crossfading is applied and in the transition from pseudo-stereo to stereo reception, the switching comes in less than 100 ms to fruition .
  • this special form it is possible to slowly get the listener accustomed to the worse pseudo-stereo experience, which makes the usual inconspicuous and thus very pleasant transition to the poorer sound itself.
  • the fast, hard way of switching from bad to better stereo reception is deliberately chosen, since the advantage of stereo reception is particularly noticeable given a sufficiently advantageous sound experience during switching. This combination thus makes it possible to combine the seemingly reluctant switching principles into a particularly advantageous overall device which enables a sound-optimized switching back and forth of the radio receiver from stereo to pseudo-stereo reception.
  • the switching operation is performed according to a predetermined switching characteristic.
  • the switching characteristic is chosen so that the listener perceives the most pleasant switching from one state to another. Examples of suitable characteristics are, but are not limited to, linear gradients or such third degree.
  • the pseudo-stereo circuit is formed by two circuits, one for the left and one for the right channel. Both circuits are designed accordingly.
  • the one circuit contains a delay element, on the one hand the input signal and on the other hand, the amplified by a factor g and fed back delayed signal is supplied.
  • the signal delayed in the delay element by the time delay del is subsequently amplified again by the factor -g before it is supplied to the input signal and fed to the output for this channel.
  • the other circuit for the other channel corresponds in structure to the former, it being noted that instead of the gain factor g the factor -g and vice versa is set.
  • This simple type of pseudo-stereo circuit makes it possible to produce a spatial sound sensation close to the stereo signal in a low-cost manner.
  • the mono signal is supplied to a delay element which delays them by the time del. Subsequently, this signal is amplified in an amplifier stage by the gain factor g, which lies between 0 and 1.
  • the linked signals then form the output signals for the left and right channel, respectively.
  • the time del and / or the factors g are selected such that the user experiences optimized surround sound in each specific vehicle.
  • Fig. 1 shows a tuner, which is designed here as an FM tuner, which feeds the demodulated signal to the stereo decoder, which is connected to the control unit and this reports the presence of a stereo or a mono signal.
  • the signal output by the stereo decoder is supplied on the one hand to a switching unit and on the other hand supplied to a pseudo-stereo circuit, which processes the supplied signal to a pseudo-stereo signal and subsequently supplies the switching unit.
  • the switching unit switches controlled by the Control Unit between the supplied signals back and forth.
  • the control unit is informed, which then automatically forwards the mono signal processed by the pseudo-stereo circuit to the pseudo-stereo signal via the switching unit to the loudspeakers for the left and right channels.
  • This circuit thus ensures a completely automatic switching between the stereo signal and the pseudo-stereo signal, which was formed by the pseudo-stereo circuit of a mono signal.
  • the switching process is carried out according to switching characteristics permanently stored in the switching unit, wherein preferably a "hard” switching with a time of less than 100 ms of pseudo-stereo to stereo and a "soft" switching in the form of a fade over a period of the order of one second is selected. It does not matter for what reason the mono signal has arisen, ie it is independent of whether only a mono signal was received or received due to the poor reception conditions of the stereo signal this only as a mono signal and amplified.
  • the mobile broadcast receiver includes a voice recognition circuit for inhibiting the processing when speech is present.
  • Speech recognition is performed by a static evaluation of the union or frequency course of the Aundfunksignals.
  • the Fig. 2 and 3 show two alternatives for the basic structure of pseudo-stereo circuits.
  • the circuit arrangement according to Fig. 2 the mono signal is supplied. In the respective circuit for the left and right channel, this is linked to a del delayed by a delay member by the time del and amplified by an amplifier stage by g or -g signal which is supplied to the delay element in turn.
  • the delayed signal is subsequently amplified in a second amplifier stage by the factor -g or g, in turn linked to the mono signal and fed to the right and the left output channel of the pseudo-stereo circuit.
  • the mono signal is delayed by a time del in a delay element common to both circuits and amplified by a factor g in a common amplifier stage which is between 0 and 1.

Claims (11)

  1. Récepteur radio mobile présentant les caractéristiques suivantes:
    - un tuner FM avec un décodeur stéréo, à la sortie duquel un signal stéréo ou mono peut être prélevé;
    - un circuit pseudo-stéréo, qui est commuté sur la sortie du décodeur stéréo,
    - un circuit d'évaluation de qualité, par lequel une commutation de mode stéréo en mode mono peut être effectuée en cas d'abaissement de la qualité de réception au-dessous d'une valeur limite et le traitement pour le signal pseudo-stéréo peut être déclenché par la suite,
    - un circuit de reconnaissance vocale, par lequel, en cas de présence de parole dans le signal reçu, un traitement du signal mono en signal pseudo-stéréo peut être interdit,
    le circuit de reconnaissance vocale contenant un circuit d'analyse pour la courbe dans le temps ou fréquentielle du signal radio qui enregistre la courbe, l'analyse au plan statistique et amène le résultat de l'analyse au circuit pseudo-stéréo.
  2. Récepteur radio mobile selon la revendication 1, caractérisé en ce que la valeur limite est choisie de telle sorte qu'on a une commutation précoce, même avec une réception stéréo encore possible et suffisamment dépourvue de perturbations, sur le mode mono.
  3. Récepteur radio mobile selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu une unité de commutation au moyen de laquelle une commutation entre le signal stéréo et le signal pseudo-stéréo peut être effectuée par le circuit pseudo-stéréo.
  4. Récepteur radio mobile selon la revendication 3, caractérisé en ce que l'unité de commutation est conçue de telle sorte que l'opération de commutation est terminée en moins de 100 ms.
  5. Récepteur radio mobile selon la revendication 3, caractérisé en ce que l'unité de commutation est conçue de telle sorte que l'opération de commutation est terminée sous la forme d'un écrasement à l'intérieur d'une période d'environ 1 s.
  6. Récepteur radio mobile selon les revendications 4 et 5, caractérisé en ce que l'unité de commutation est conçue de telle sorte que l'opération de commutation en pseudo-stéréo sous la forme d'un écrasement est terminée en l'espace d'une période d'environ 1 s et que l'opération de commutation de pseudo-stéréo en stéréo est terminée en moins de 100 ms.
  7. Récepteur radio mobile selon l'une quelconque des revendications précédentes, caractérisé en ce que le circuit pseudo-stéréo présente pour chacun des deux canaux stéréo (L, R) un circuit séparé qui contient un élément de temporisation, à l'entrée duquel le signal de sortie, associé avec le signal mono, amplifié d'un facteur g et réinjecté, est amené et dont le signal de sortie est amplifié du facteur g et associé ensuite encore une fois au signal mono, le facteur g étant choisi positif pour le premier canal stéréo (L) et le facteur g étant choisi négatif pour le second canal stéréo (R).
  8. Récepteur radio mobile selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le circuit pseudo-stéréo présente pour chacun des deux canaux stéréo (L, R) un circuit séparé dans lequel est prévu un mélangeur qui associe le signal mono temporisé par un élément de temporisation d'une temporisation (del) et amplifié par un niveau amplificateur de g (0 < g < 1) avec le signal mono non temporisé et amplifié pour un canal de g* = 1 - g et pour l'autre canal de g** = g - 1 et l'amène à la sortie de canal respective.
  9. Récepteur radio mobile selon la revendication 7 ou 8, caractérisé en ce que le facteur g est réglable.
  10. Récepteur radio mobile selon l'une quelconque des revendications 7 à 9, caractérisé en ce que la temporisation (del) est réglable.
  11. Récepteur radio mobile selon l'une quelconque des revendications précédentes, caractérisé en ce que le circuit pour la reconnaissance de la parole contient un détecteur pour le code de message routier, qui est relié au circuit pseudo-stéréo et qui interdit un traitement en cas de présence de messages routiers.
EP95118291A 1994-11-26 1995-11-21 Processeur de signaux pseudostéréo pour récepteur mobile Expired - Lifetime EP0714222B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4442147A DE4442147C2 (de) 1994-11-26 1994-11-26 Mobiler Rundfunkempfänger
DE4442147 1994-11-26

Publications (3)

Publication Number Publication Date
EP0714222A2 EP0714222A2 (fr) 1996-05-29
EP0714222A3 EP0714222A3 (fr) 1998-10-14
EP0714222B1 true EP0714222B1 (fr) 2008-09-03

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EP95118291A Expired - Lifetime EP0714222B1 (fr) 1994-11-26 1995-11-21 Processeur de signaux pseudostéréo pour récepteur mobile

Country Status (3)

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EP (1) EP0714222B1 (fr)
AT (1) ATE407541T1 (fr)
DE (2) DE4442147C2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19900819A1 (de) * 1999-01-12 2000-07-13 Bosch Gmbh Robert Verfahren zum Dekodieren gestörter Funksignale von Mehrkanal-Audiosendungen
DE19900818A1 (de) * 1999-01-12 2000-07-13 Bosch Gmbh Robert Verfahren und Empfänger zum Unterdrücken von Störungen beim Funkempfang von Mehrkanal-Audiosendungen
DE10110422A1 (de) 2001-03-05 2002-09-19 Harman Becker Automotive Sys Verfahren zur Steuerung eines mehrkanaligen Tonwiedergabesystems und mehrkanaliges Tonwiedergabesystem

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6146700A (ja) * 1984-08-10 1986-03-06 Matsushita Electric Ind Co Ltd 疑似ステレオ再生回路
JPS6374232A (ja) * 1986-09-17 1988-04-04 Clarion Co Ltd ステレオ受信装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598442A (ja) * 1982-07-06 1984-01-17 Matsushita Electric Ind Co Ltd 受信器
NL8303945A (nl) * 1983-11-17 1985-06-17 Philips Nv Inrichting voor het realiseren van een pseudo-stereo signaal.
JPS63177635A (ja) * 1986-10-29 1988-07-21 Alpine Electron Inc Ａｍ受信機
JPS63194438A (ja) * 1987-02-09 1988-08-11 Alpine Electron Inc Ｆｍステレオ受信機
US4833715A (en) * 1987-03-06 1989-05-23 Alps Electric Co., Ltd. FM stereo receiver
US5056149A (en) * 1987-03-10 1991-10-08 Broadie Richard G Monaural to stereophonic sound translation process and apparatus
JPH03163999A (ja) * 1989-08-05 1991-07-15 Matsushita Electric Ind Co Ltd 音響再生装置
JPH04284725A (ja) * 1991-03-14 1992-10-09 Pioneer Electron Corp Ｒｄｓ受信機

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6146700A (ja) * 1984-08-10 1986-03-06 Matsushita Electric Ind Co Ltd 疑似ステレオ再生回路
JPS6374232A (ja) * 1986-09-17 1988-04-04 Clarion Co Ltd ステレオ受信装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
KITZEN W.J.W. ET AL: "Applications of a digital audio-signal processor in T.V. sets", PHILIPS JOURNAL OF RESEARCH, vol. 39, no. 3, 1984, AMSTERDAM, pages 94 - 102 *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 205 (E - 420) *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 308 (E - 647) *

Also Published As

Publication number Publication date
DE4442147A1 (de) 1996-06-13
DE59511097D1 (de) 2008-10-16
DE4442147C2 (de) 2002-02-14
EP0714222A2 (fr) 1996-05-29
ATE407541T1 (de) 2008-09-15
EP0714222A3 (fr) 1998-10-14

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