EP1013141B1 - Procede et dispositif pour restituer un signal acoustique stereophonique - Google Patents

Procede et dispositif pour restituer un signal acoustique stereophonique Download PDF

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Publication number
EP1013141B1
EP1013141B1 EP98924041A EP98924041A EP1013141B1 EP 1013141 B1 EP1013141 B1 EP 1013141B1 EP 98924041 A EP98924041 A EP 98924041A EP 98924041 A EP98924041 A EP 98924041A EP 1013141 B1 EP1013141 B1 EP 1013141B1
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EP
European Patent Office
Prior art keywords
loudspeakers
wavefronts
resultant
space
amplitude
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
EP98924041A
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German (de)
English (en)
Other versions
EP1013141A1 (fr
Inventor
Christoph Montag
Hermann HOLTMANNSPÖTTER
Ludwig Klapproth
Christian Vehorn
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
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1013141A1 publication Critical patent/EP1013141A1/fr
Application granted granted Critical
Publication of EP1013141B1 publication Critical patent/EP1013141B1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the invention relates to a method for reproducing a stereophonic audio signal in a room, especially the Passenger cell of a motor vehicle, with several Positions in the room to play speakers acoustic signals are arranged and of an arrangement to this according to the genre of the independent claims.
  • surround effect is to be understood here that a located on the longitudinal axis mentioned Listeners have different signals from the left and right Speakers and thus a spatial Sound impression, but usually with a pronounced Inkoplocalmaschine receives what means nothing other than that the listener receives a spatial sound impression, however the sound sources are located as close to or in the head.
  • EP-A 0 559 530 discloses a filter arrangement for Processing of numerical audio signals to generate Hall or echo effects. For this, the ones to be given again Audio signals passed through filter banks, in which the original audio signal each time delayed portions of the audio signal with weight factors. The output signals of the recursive filters realized filter banks are left and one right audio channel fed.
  • the inventive method and the inventive Arrangement with the features of the independent claims have the advantage that within one extended listening zone within the room to be sounded, especially on both the driver and the Passenger side inside the passenger compartment Motor vehicle with an equally natural hearing impression the impression of a natural distance between the sound sources the reproduction of a stereophonic audio signal is.
  • the impression of a natural distance from the Sound sources correspond to the auditory impression of one Listener who actually sits in the concert hall and the Instruments located according to their actual position. For this it is also necessary that the impression of the listener is awakened, sound sources may also outside to locate the room to be sounded, which is achieved by means of the inventive method or the inventive Arrangement is made possible.
  • control for Control of the individual loudspeakers arranged in the room the signals for each speaker in terms Amplitude and phase processed.
  • the Control also within the room to be sonicated occurring reflections, or their influence on the natural stereo listening impression within the listening zone.
  • the basic idea underlying the invention consists in a natural auditory impression of one in a room reproduced stereophonic audio signal on a variety of positions within the room by allowing that at all these positions the audio signals for the left and the right stereo channel, provided that they have the same level have the same loudness.
  • This will achieved according to the invention in that a variety of Speakers either along a straight line or around the Are arranged around the room, the speakers being such can be controlled that the wavefronts of the Speakers emitted acoustic signals at least a first resulting wavefront for the left and a second resulting wavefront for the overlay the right channel of the stereophonic audio signal, and that the resulting wave fronts are in an auditory zone cross within the room.
  • the resulting Wavefronts represent lines of the same amplitude for the left and right channels of the stereo audio signal .
  • points at which the Audio signals for the left and right channels as the same be felt out loud so that at these points Stereo listening impression results.
  • loudspeakers in the passenger compartment 10 of the motor vehicle 1 to 7 along the sides of the vehicle and the dashboard arranged speakers 1 and 7 in the left and right rear Side panel, speakers 2 and 6 in the left and right front door trim, speakers 3 and 5 in the left and right corners of the dashboard and the Speaker 4 arranged in the middle of the dashboard is.
  • the audio signal for the right channel initially radiated from the right speaker 5, so that of the speaker 5 outgoing wavefront 85 in the Figure 1 already shown the furthest is advanced.
  • the staggered Control of the individual speakers using on and the same signal is in the present case by suitably dimensioned time delay elements realized.
  • the two resulting Wavefronts whose directions of propagation each have one first share in parallel and a second share each perpendicular to an imaginary axis through the have sonication space, the second part have opposite directions, they cross two resulting wave fronts within one as Designated wide area within the listening zone Passenger compartment of the motor vehicle. Since the two resulting wavefronts for constant amplitude locations represent the signal of the left and right channels, there is a natural stereo listening impression within the listening zone.
  • Each of the loudspeakers 1 to 7 is a summing element 31 to 37 upstream, each summing element 31 to 37 each a weighted and time-delayed audio signal for the left and right channels are fed. So everyone is Speakers 1 to 7 with signal components for the left and the right channel of the stereo signal is applied.
  • the Weighting of the signal components for the left and right Audio channel and thus the control of the amplitude of the individual speakers reproduced signal components is done by multipliers 41 to 47 and 51 to 57, which the signal components for the left and right Audio channel and further weight factors to theirs Influence are supplied.
  • To control the phase or the duration of that from the individual speakers radiated signals are off the multipliers chains Delay elements 11 to 17 for the left and 21 to 27 upstream for the right channel.
  • the operation of the arrangement shown in Figure 2 will be explained in more detail using the following example.
  • the loudspeakers 1 and 2 arranged in the side panels and 6 and 7 are at a distance 18 from each other present example 0.6 m that in the dashboard arranged speakers 3, 4 and 5 to each other a distance 28 of 0.4 m.
  • a resulting wavefront 80 for the right channel that diagonally progresses from the front right to the rear left corner of the passenger compartment, and further a resulting wavefront for the left channel that propagates from the front left to the rear right corner of the passenger compartment has been created
  • the values for the delay elements 21 to 27 for the right channel and 11 to 17 for the left channel, and the weighting factors supplied to the multipliers 41 to 47 for the right channel and 51 to 57 for the left channel are determined as follows.
  • the weighting factors for influencing the amplitude of the audio signals emitted by the individual loudspeakers were chosen as follows. 41, 57 0.1 42, 56 0.2 43, 55 0.5 44, 54 0.5 45, 53 0.5 46, 52 0.2 47, 51 0.1
  • the signal R for the right channel initially after a first time delay 21 of 20 * r a with weighting in the multiplier 55 by a factor of 0.5 via the loudspeaker 5, after a time delay 26 of 25 * r a and Weighting in the multiplier 56 with the factor 0.2 via the loudspeaker 6, after a time delay 21 + 22 of (20 + 43) * r a and weighting with the factor 0.5 in the multiplier 54 via the loudspeaker 4, after one Delay 26 + 27 of (25 + 49) * r a and weighting 0.1 in multiplier 57 via loudspeaker 7, after a delay 21 + 22 + 23 of (20 + 43 + 43) * r a and weighting in multiplier 53 via loudspeaker 3, after delay in delay stages 21, 22, 23 and 24 by (20 + 43 + 43 + 68) * r a and weighting by 0.2 in multiplier 52 via loudspeaker 2 and finally after delay by ( 20 + 43 + 43 + 68 + 49 * r a in the delay
  • FIG 3 are a variety of possible locations for Loudspeaker according to the arrangement according to the invention shown.
  • speakers 1 to 7 already are arranged are suitable for accommodating further Speakers also the parcel shelf, in the present case with four speakers 91 to 94 and the outer areas of the Footwell for driver and front passenger to accommodate more Speakers 95 and 96.
  • FIG. 4 is a block diagram of what is relevant to the invention Part of a car radio 100 as a playback device shown for stereophonic or multi-channel audio signals.
  • a digital signal processor 101 which controls, i.e. the time delay elements, the multipliers and the Contains adders of the arrangement shown in Figure 2, are L and R signals for the left and right audio channels, as well as possibly further signals for further audio channels fed.
  • the values for the delays of the Delay elements as well as the multipliers weight factors supplied are a memory 102 taken.
  • Stand at the output of the digital signal processor the signals for controlling the individual speakers 1 to 7, and possibly further speakers 91 to 96 ready after amplification in a low frequency amplifier 103 are fed to the speakers.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Stereophonic System (AREA)
  • Stereophonic Arrangements (AREA)

Claims (6)

  1. Procédé de reproduction d'un signal audio stéréophonique ayant un canal gauche et un canal droit dans un volume, notamment un habitacle (10) d'un véhicule automobile, selon lequel, dans plusieurs positions de l'espace on a des haut-parleurs (1-7) pour reproduire des signaux acoustiques, les haut-parleurs (1-7) recevant les signaux à la fois du canal gauche et du canal droit retardés individuellement pour chaque haut-parleur (1-7) et pondérée en amplitude,
    caractérisé en ce que
    la temporisation et la pondération d'amplitude des signaux audio reproduits par les haut-parleurs sont réglés de façon que les fronts d'onde (83-87) des signaux acoustiques émis par les haut-parleurs (1-7) soient combinés pour donner au moins un premier front d'ondes résultant pour le canal gauche et un second front d'ondes résultant (80) pour le canal droit, les fronts d'ondes résultants ayant une phase et une amplitude constantes pendant leur parcours, et
    les fronts d'ondes résultants se croisent dans une zone d'écoute déployée à l'intérieur du volume, avec un grand nombre de positions d'écoute éloignées les unes des autres, de façon à obtenir une impression d'écoute stéréophonique dans la zone d'écoute.
  2. Dispositif de reproduction d'un signal audio stéréophonique avec un canal gauche et un canal droit dans un volume notamment dans l'habitacle (10) d'un véhicule, selon lequel en plusieurs positions à l'intérieur de l'espace on a prévu des haut-parleurs (1-7) pour reproduire des signaux acoustiques, les haut-parleurs (1-7) comportant chaque fois des moyens (31-37) pour combiner les signaux du canal gauche et ceux du canal droit du signal audio à reproduire, les haut-parleurs (1-7) ayant des moyens pour permettre à chaque haut-parleur (1-7) d'influencer individuellement la phase (11-17; 21-27) et l'amplitude (41-47 ; 51-57) des signaux du canal gauche et du canal droit,
    caractérisé en ce que
    on sélectionne la phase et l'amplitude des signaux audio reproduits par les haut-parleurs (1-7) de façon que les fronts d'ondes (83-87) des ondes acoustiques émises par les haut-parleurs (1-7) se combinent pour donner un premier front d'onde résultant pour le canal gauche (L) et un second front d'ondes résultant (80) pour le canal droit (R) du signal audio stéréo, et le long de ce front d'ondes, la phase et l'amplitude du signal audio sont constants et les fronts d'ondes résultants au niveau d'une zone d'écoute ayant un certain nombre de positions d'écoute éloignées les unes des autres à l'intérieur du volume se croisent ce qui donne une impression d'écoute stéréophonique dans la zone d'écoute.
  3. Dispositif selon la revendication 2,
    caractérisé en ce que
    les haut-parleurs (1-7) sont disposés dans le volume autour de la zone d'écoute.
  4. Dispositif selon les revendications 2 ou 3,
    caractérisé en ce que
    la commande des haut-parleurs (1-7) comprend des éléments de temporisation (11-17 ; 21-27) avec lesquels on influence la phase des signaux acoustiques émis par les différents haut-parleurs (1-7) pour que les fronts d'ondes (80) résultants, formés par la combinaison des fronts d'ondes (83-87) des signaux acoustiques émis par les différents haut-parleurs (1-7), présentent un tracé prédéterminé de préférence linéaire.
  5. Dispositif selon l'une des revendications 2 à 4,
    caractérisé en ce que
    la commande des haut-parleurs (1-7) comprend des amplificateurs et/ou des atténuateurs (41-47; 51-57) dont les coefficients d'amplification sont réglés pour que les fronts d'ondes résultants, formés par la combinaison des fronts d'ondes (80) des différents signaux acoustiques émis par les différents haut-parleurs (1-7), présentent une amplitude constante.
  6. Dispositif selon l'une des revendications 2 à 5,
    caractérisé en ce que
    en dehors de la zone d'écoute, les haut-parleurs (1-5) sont installés perpendiculairement et/ou parallèlement à un axe longitudinal géométrique traversant l'espace, dans le cas d'un habitacle de véhicule automobile, perpendiculairement à la direction de déplacement et/ou le long de celle-ci, et
    les valeurs de temporisation des éléments de temporisation (11-17; 21-27) de la commande sont dimensionnées pour obtenir pour les directions d'extension des zones dans au moins deux fronts d'ondes résultants (80), chaque fois une première partie parallèle et chaque fois une seconde partie perpendiculaire à l'axe géométrique de l'espace, les secondes parties ayant des directions opposées.
EP98924041A 1997-09-09 1998-04-03 Procede et dispositif pour restituer un signal acoustique stereophonique Expired - Lifetime EP1013141B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19739425 1997-09-09
DE19739425A DE19739425A1 (de) 1997-09-09 1997-09-09 Verfahren und Anordnung zur Wiedergabe eines sterophonen Audiosignals
PCT/DE1998/000943 WO1999013683A1 (fr) 1997-09-09 1998-04-03 Procede et dispositif pour restituer un signal acoustique stereophonique

Publications (2)

Publication Number Publication Date
EP1013141A1 EP1013141A1 (fr) 2000-06-28
EP1013141B1 true EP1013141B1 (fr) 2003-04-23

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EP98924041A Expired - Lifetime EP1013141B1 (fr) 1997-09-09 1998-04-03 Procede et dispositif pour restituer un signal acoustique stereophonique

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US (1) US6584202B1 (fr)
EP (1) EP1013141B1 (fr)
JP (1) JP2001517005A (fr)
AU (1) AU744020B2 (fr)
DE (2) DE19739425A1 (fr)
WO (1) WO1999013683A1 (fr)

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Publication number Publication date
JP2001517005A (ja) 2001-10-02
AU744020B2 (en) 2002-02-14
WO1999013683A1 (fr) 1999-03-18
AU7637898A (en) 1999-03-29
US6584202B1 (en) 2003-06-24
DE19739425A1 (de) 1999-03-11
EP1013141A1 (fr) 2000-06-28
DE59808087D1 (de) 2003-05-28

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