EP0100805B1 - Device for the sonic reproduction of a stereophonic record - Google Patents

Device for the sonic reproduction of a stereophonic record Download PDF

Info

Publication number
EP0100805B1
EP0100805B1 EP82401528A EP82401528A EP0100805B1 EP 0100805 B1 EP0100805 B1 EP 0100805B1 EP 82401528 A EP82401528 A EP 82401528A EP 82401528 A EP82401528 A EP 82401528A EP 0100805 B1 EP0100805 B1 EP 0100805B1
Authority
EP
European Patent Office
Prior art keywords
speaker units
circuit
room
speakers
delay line
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
EP82401528A
Other languages
German (de)
French (fr)
Other versions
EP0100805A1 (en
Inventor
Henry Chesnard
Dominique Perruchon
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.)
Individual
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8189935&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0100805(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to EP82401528A priority Critical patent/EP0100805B1/en
Priority to DE8282401528T priority patent/DE3274408D1/en
Publication of EP0100805A1 publication Critical patent/EP0100805A1/en
Application granted granted Critical
Publication of EP0100805B1 publication Critical patent/EP0100805B1/en
Expired legal-status Critical Current

Links

Images

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 
    • H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/024—Positioning of loudspeaker enclosures for spatial sound reproduction
    • 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 
    • H04S5/005—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo five- or more-channel type, e.g. virtual surround
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space

Definitions

  • the invention relates to devices for reproducing sound in several dimensions from a stereophonic recording.
  • the existing reproduction devices intended for listening at home that is to say in rooms whose dimensions are limited, aim to give the listener an impression approaching that which he feels in a bathroom. concert.
  • the two speakers (or even four speakers) used for reproduction do not allow the listener to find the distribution of timbres to which he is accustomed, the stereophonic effect practically exists only for a single listening position and all displacement from this position results in an apparent relative displacement of instruments and voices.
  • the listener of a stereophonic system who knows that, in a symphonic orchestra, the brass instruments are located at the top of the orchestra, is shocked to hear them concentrated with the woodwinds and the violins.
  • a conforming device of the type defined in the preamble of claim 1 (US-A-4,053,711) is known with various variants.
  • One of these variants, not in accordance with this preamble ( Figure 5), includes filters having a cut-off frequency corresponding substantially to the limit of the audio tape. The insertion of such filters in the feedback loop in the direct signal that another embodiment provides would not allow the audio loop to be balanced.
  • the invention aims to provide a reproduction device making it possible, from conventional stereophonic recordings, to better restore the atmosphere of a concert hall, to give a distribution of timbres corresponding to that of the orchestra and to freeze this arrangement of timbres whatever the position of the listener in a large listening volume.
  • the invention provides a device of the type defined above, in accordance with the characterizing part of claim 1.
  • the additional loudspeakers and the supply circuit associated with them constitute a propagation assembly making it possible to give an impression similar to that of a concert hall: the delay line provided for each loudspeaker (or common to the two loudspeakers), advantageously adjustable , reproduces the effect of the length and width of the concert hall; the filter, or filters, make it possible to reproduce the effect of the nature of the walls of the concert hall as well as their reflection and their mixing, thanks to the mixer.
  • the gain of the power supply circuit of the pair of additional speakers is advantageously adjustable, so as to allow the listener to measure the proportion of sound volume coming from the stereo set and the propagation set.
  • the device comprises a restitution assembly giving a more faithful representation of the distribution of the stamps and moreover avoiding the apparent displacement of these various stamps relative to one another in the event of displacement of the listener in the listening room.
  • the propagation assembly comprises four enclosures arranged along a trapezoid, the two enclosures placed along the large base of the trapezoid being located at the same height near two opposite corners of the part, along the width thereof, while the other two speakers are placed at a lower height and are closer to the listening location.
  • two lateral speakers can be provided and fed by a circuit similar to that associated with the additional speakers mentioned above.
  • All the speakers will advantageously consist of directional mini-speakers, possibly associated with subwoofers.
  • Such mini-speakers can be accommodated more easily in an apartment and, moreover, take into account the characteristics of the human ear, which locates an emission source the less easily the more it is small dimension.
  • the restitution assembly will comprise two enclosures 10a and 10b placed near one of the walls forming the width of the room in the angles of it.
  • These two speakers 10a and 10b are advantageously placed so that their base is approximately 15 cm above the listener's head when the latter is in his listening position. This arrangement takes advantage of the non-homogeneous nature of auditory perception.
  • Two other enclosures 12a and 12b are placed in the following manner: from the projection of the enclosures 10a and 10b on the floor, two lines are drawn making an angle a of approximately 35 to 40 ° with the side walls.
  • the speakers 12a and 12b will be placed vertical to these lines, at a height h o such that their apex is approximately at the level of the listener's chest, in order to avoid an overly axial perception of these speakers.
  • the two speakers 10a and 12a will be supplied by one of the channels of a stereophonic reproduction chain which may be of a conventional nature, the speakers 10b and 12b by the other channel. All of these speakers will advantageously be of the maniature type, in order to reduce the possibilities of individual location of these speakers by the ear. They can be supplemented by subwoofers.
  • the propagation assembly intended to simulate the reverberations from the bottom of the room comprises, in its simplest embodiment, two enclosures 14a and 14b placed near the wall opposite to that which receives the enclosures 10a and 10b. Their height h corresponds to the ear height of the listener.
  • the speakers 14a, 14b are supplied by a circuit of the kind shown in FIG. 3.
  • This circuit is added to a conventional stereophonic reproduction circuit 18, which may be of any constitution, comprising conventional organs for reading and pre-amplification, shown diagrammatically in 20, and a power amplifier 22 supplying the speakers 10 and 12.
  • the circuit comprises, in the version which incorporates the connections shown in dashes in FIG. 3, a head stage 24 which fulfills in particular the function of summing the signals of the two stereophonic channels taken from the preamplifier 20. This summation makes it possible to mix the stereophonic signals as are mixed, in a concert hall or concert hall, the sound waves coming from the stage when they arrive near the back of the hall.
  • the signal from the head circuit 24 is then applied to a delay line 26 which retains it for a variable time depending on the length of the room which it is desired to simulate, taking into account that 100 ms corresponds to approximately 34 m.
  • the signal leaving the delay line 26 is then sent to a mixer 28 which also receives, via a direct line 30 provided with an adjustment potentiometer 32, an undelayed component.
  • a fraction of the signal leaving the delay line is returned upstream of this line through a filter 34 intended to attenuate sounds beyond a frequency of approximately 500 Hz.
  • the response curve of this filter may advantageously have a particularly marked attenuation for an intermediate frequency, between 500 Hz and 1 kHz approximately.
  • the output signal from the mixer 28 drives a power amplifier 36 connected to the speakers 14a and 14b.
  • the circuit may include means making it possible to reinject the signal having passed through the filter 34 more or less towards the input of the delay line, to modify the sensation of volume.
  • the circuit also includes the usual potentiometers or rheostats for volume adjustment and balancing.
  • the delay line 26 of the circuit of FIG. 3 uses charge transfer circuits associated with a high frequency clock (typically 200 kHz) and the head circuit 24 can then have the constitution shown in FIG. 1.
  • the input mixer-separator 38 drives an active second order filter 40, intended to cut the frequencies exceeding the audio band.
  • This filter drives, through an impedance separator-adapter 42, a dynamic compression circuit 44 (using for example an integrated circuit NE 571) made necessary by the use of a transfer delay line dump.
  • This delay line includes a sampling circuit, each sample being stored in a capacitor, then transferred to another, this technique making it easy to reintroduce the return signal from the filter 34 at a variable stage.
  • the circuit of FIG. 3 can be completed by an additional filter, immediately upstream of the amplifier 36, making it possible to model the response at high frequencies and to simulate a performance hall.
  • This filter can be fitted with a switch to weaken the signal, for example at the rate of 3 dB per octave, from a high variable frequency.
  • We can for example provide four positions, corresponding to a loss from 4, 6, 8 and 10 kHz.
  • a circuit of the kind shown in FIG. 3 is associated with each of the speakers 14a and 14b.
  • the connections indicated in dashes are deleted in FIG. 3 and an additional circuit is connected to the output 48.
  • the propagation assembly may include an additional pair of speakers 16a, 16b located on each side of the room and approximately mid-length thereof. These two enclosures may be placed on two lines each connecting the front enclosure of the restitution assembly to the enclosure of the corresponding propagation assembly. Each of these speakers 16a, 16b is associated with a power supply circuit of the type shown in solid lines in FIG. 3, connected to the output of the preamplifier 20.
  • the two additional speakers 16a and 166 make it possible to simulate the reverberation of the side walls, depending on the width and the reflectivity of the walls of the room.
  • the device in its most elaborate embodiment, makes it possible to simulate the width and the length of the room, thanks to the delay lines; the nature of the walls, thanks to the filters; the intensity of successive reflections, thanks to the reinjection of signals; and mixtures thanks to the summers.
  • miniature loudspeakers the volume of which can be reduced to any cubic decimetres, in order to reduce the bulk and also to take advantage of their favorable properties from the point of view of the location of sound sources.
  • the invention is susceptible of numerous variants. In particular, it is possible to use the same delay line circuit to supply the rear speakers 14 and the speakers 16.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)

Description

L'invention concerne les dispositifs de reproduction sonore à plusieurs dimensions à partir d'un enregistrement stéréophonique.The invention relates to devices for reproducing sound in several dimensions from a stereophonic recording.

Les dispositifs de reproduction existants destinés à l'écoute à domicile, c'est-à-dire dans des pièces dont les dimensions sont limitées, visent à donner à l'auditeur une impression se rapprochant de celle qu'il ressent dans une salle de concert.The existing reproduction devices intended for listening at home, that is to say in rooms whose dimensions are limited, aim to give the listener an impression approaching that which he feels in a bathroom. concert.

En fait, ces dispositifs n'atteignent que très imparfaitement ces résultats.In fact, these devices achieve these results only very imperfectly.

Parmi leurs défauts, on peut citer les suivants. L'impression reçue par l'auditeur est très différente de celle d'une salle de concert, même destinée à la musique de chambre, car les réverbérations sur les parois de la pièce d'écoute de faibles dimensions ont des intensités, un spectre de fréquence et des retards très différents de ceux de la pièce d'origine et les manipulations lors de la prise de son ne peuvent compenser ces différences.Among their shortcomings are the following. The impression received by the listener is very different from that of a concert hall, even intended for chamber music, because the reverberations on the walls of the listening room of small dimensions have intensities, a spectrum of frequency and delays very different from those of the original part and the manipulations when taking sound can not compensate for these differences.

Les deux enceintes (ou même quatre enceintes) utilisées pour la reproduction ne permettent pas à l'auditeur de retrouver la répartition des timbres à laquelle il est habitué, l'effet stéréophonique n'existe pratiquement que pour une seule position d'écoute et tout déplacement à partir de cette position se traduit par un déplacement relatif apparent des instruments et des voix. De façon générale, l'auditeur d'un système stéréophonique qui sait que, dans un orchestre symphonique, les cuivres se situent en haut de l'orchestre, est choqué de les entendre concentrés avec les bois et les violons.The two speakers (or even four speakers) used for reproduction do not allow the listener to find the distribution of timbres to which he is accustomed, the stereophonic effect practically exists only for a single listening position and all displacement from this position results in an apparent relative displacement of instruments and voices. Generally speaking, the listener of a stereophonic system who knows that, in a symphonic orchestra, the brass instruments are located at the top of the orchestra, is shocked to hear them concentrated with the woodwinds and the violins.

Des tentatives ont déjà été faites pour réaliser des dispositifs de reproduction sonore améliorés. On connaît en particulier un dispositif conforme du type défini dans le préambule de la revendication 1 (US-A-4 053 711) avec diverses variantes. Une de ces variantes, non conforme à ce préambule (Figure 5), comporte des filtres ayant une fréquence de coupure correspondant sensiblement à la limite de la bande audio. L'insertion de tels filtres dans la boucle de réinjection dans le signal direct que prévoit un autre mode de réalisation ne permettrait pas d'équilibrer la boucle audio.Attempts have already been made to make improved sound reproduction devices. In particular, a conforming device of the type defined in the preamble of claim 1 (US-A-4,053,711) is known with various variants. One of these variants, not in accordance with this preamble (Figure 5), includes filters having a cut-off frequency corresponding substantially to the limit of the audio tape. The insertion of such filters in the feedback loop in the direct signal that another embodiment provides would not allow the audio loop to be balanced.

Le document US-A-4 039 755 fait connaître de son côté un dispositif de reproduction sonore stéréophonique ayant un circuit de tête à mélangeur, mais dans un ensemble différent de celui du document US-A-4 053 711.The document US-A-4,039,755, for its part, discloses a stereophonic sound reproduction device having a mixer head circuit, but in a different assembly from that of document US-A-4,053,711.

L'invention vise à fournir un dispositif de reproduction permettant, à partir d'enregistrements stéréophoniques classiques, de mieux restituer l'ambiance d'une salle de concert, de donner une répartition des timbres correspondant à celle de l'orchestre et de figer cette disposition de timbres quelle que soit la position de l'auditeur dans un large volume d'écoute.The invention aims to provide a reproduction device making it possible, from conventional stereophonic recordings, to better restore the atmosphere of a concert hall, to give a distribution of timbres corresponding to that of the orchestra and to freeze this arrangement of timbres whatever the position of the listener in a large listening volume.

Dans ce but, l'invention propose un dispositif du type ci-dessus défini, conforme à la partie caractérisante de la revendication 1.To this end, the invention provides a device of the type defined above, in accordance with the characterizing part of claim 1.

Dans un tel dispositif, il y à équilibrage satisfaisant et combinaison des signaux d'entrée des deux voies stéréophoniques pour alimenter les enceintes additionnelles: c'est sous cette forme que l'on reproduit le mieux les réflexions arrière d'une salle de concert. On ne retrouve nullement cette disposition dans le document US-A-4 053 711 et rien dans le document US-A-4 039 755 ne suggère qu'elle puisse être associée avec avantage à un circuit d'alimentation suivant le préambule de la revendication 1.In such a device, there is satisfactory balancing and combination of the input signals from the two stereophonic channels to supply the additional speakers: it is in this form that the rear reflections of a concert hall are best reproduced. This provision is in no way found in document US-A-4,053,711 and nothing in document US-A-4,039,755 suggests that it can be associated with advantage with a supply circuit according to the preamble of claim 1.

Les enceintes additionnelles et le circuit d'alimentation qui leur est associé constituent ensemble de propagation permettant de donner une impression similaire à celle d'une salle de concert: la ligne à retard prévue pour chaque enceinte (ou commune aux deux enceintes), avantageusement réglable, permet de reproduire l'effet de la longueur et de la largeur de la salle de concert; le filtre, ou les filtres, permettent de reproduire l'effet de la nature des parois de la salle de concert ainsi que leur réflexion et leur mélange, grâce au mélangeur. Le gain du circuit d'alimentation de la paire d'enceintes additionnelles est avantageusement réglable, de façon à permettre à l'auditeur de doser la proportion de volume sonore provenant de l'ensemble stéréo et de l'ensemble de propagation.The additional loudspeakers and the supply circuit associated with them constitute a propagation assembly making it possible to give an impression similar to that of a concert hall: the delay line provided for each loudspeaker (or common to the two loudspeakers), advantageously adjustable , reproduces the effect of the length and width of the concert hall; the filter, or filters, make it possible to reproduce the effect of the nature of the walls of the concert hall as well as their reflection and their mixing, thanks to the mixer. The gain of the power supply circuit of the pair of additional speakers is advantageously adjustable, so as to allow the listener to measure the proportion of sound volume coming from the stereo set and the propagation set.

Dans un mode plus élaboré de réalisation de l'invention, le dispositif comprend un ensemble de restitution donnant une représentation plus fidèle de la répartition des timbres et évitant de plus le déplacement apparent de ces divers timbres les uns par rapport aux autres en cas de déplacement de l'auditeur dans la salle d'écoute. Pour cela, l'ensemble de propagation comporte quatre enceintes disposées suivant un trapèze, les deux enceintes placées suivant la grande base du trapèze étant situées à la même hauteur à proximité de deux coins opposés de la pièce, suivant la largeur de celle-ci, tandis que les deux autres enceintes sont placées à plus faible hauteur et sont plus rapprochées de l'emplacement d'écoute.In a more elaborate embodiment of the invention, the device comprises a restitution assembly giving a more faithful representation of the distribution of the stamps and moreover avoiding the apparent displacement of these various stamps relative to one another in the event of displacement of the listener in the listening room. For this, the propagation assembly comprises four enclosures arranged along a trapezoid, the two enclosures placed along the large base of the trapezoid being located at the same height near two opposite corners of the part, along the width thereof, while the other two speakers are placed at a lower height and are closer to the listening location.

Dans la pratique, on obtiendra de bons résultats en disposant les quatre enceintes de façon que la projection sur le sol des côtés du trapèze fasse un angle de l'ordre de 30 à 40° avec la grande dimension de la pièce.In practice, good results will be obtained by arranging the four enclosures so that the projection on the ground of the sides of the trapezoid makes an angle of the order of 30 to 40 ° with the large dimension of the room.

Pour mieux simuler les réflexions latérales des parois d'une salle de concert, deux enceintes latérales peuvent être prévues et alimentées par un circuit similaire à celui associé aux enceintes additionnelles mentionnées plus haut.To better simulate the lateral reflections of the walls of a concert hall, two lateral speakers can be provided and fed by a circuit similar to that associated with the additional speakers mentioned above.

Toutes les enceintes seront avantageusement constituées par des mini-enceintes directives, éventuellement associées à des caissons de basses. De telles mini-enceintes peuvent se loger plus facilement dans une pièce d'appartement et, de plus, tiennent compte des caractéristiques de l'oreille humaine, qui localise d'autant moins facilement une source d'émission que celle-ci est de plus faible dimension.All the speakers will advantageously consist of directional mini-speakers, possibly associated with subwoofers. Such mini-speakers can be accommodated more easily in an apartment and, moreover, take into account the characteristics of the human ear, which locates an emission source the less easily the more it is small dimension.

On arrive ainsi à obtenir une véritable restitution sonore en trois dimensions, qu'on peut qualifier d'holophonie, la multiplicité des enceintes acoustiques empêchant l'oreille de localiser les sources individuelles et donnant une impression de bain sonore où les différents timbres se retrouvent en apparence dans leur position relative normale.We thus obtain a true three-dimensional sound reproduction, which we can qualify as holophony, the multiplicity of loudspeakers preventing the ear from locating individual sources and giving the impression of a sound bath where the different timbres are apparently found in their normal relative position.

L'invention sera mieux comprise à la lecture de la description qui suit de modes particuliers de réalisation, donnés à titre d'exemples non limitatifs. La description se réfère aux dessins qui l'accompagnent, dans lesquels:

  • - la figure 1 est un schéma de principe en perspective montrant la disposition des enceintes du dispositif dans une pièce,
  • - la figure 2 est une vue en élévation de la pièce, suivant sa grande longueur, et de la disposition des enceintes montrées en figure 1,
  • - la figure 3 est un schéma de principe d'un mode de réalisation du circuit d'alimentation de l'ensemble de propagation,
  • - la figure 4 est un schéma montrant une constitution possible de l'étage de tête du circuit de la figure 3.
The invention will be better understood on reading the following description of particular embodiments, given by way of nonlimiting examples. The description refers to the accompanying drawings, in which:
  • FIG. 1 is a perspective block diagram showing the arrangement of the speakers of the device in a room,
  • FIG. 2 is an elevation view of the part, along its great length, and of the arrangement of the enclosures shown in FIG. 1,
  • FIG. 3 is a block diagram of an embodiment of the power supply circuit for the propagation assembly,
  • FIG. 4 is a diagram showing a possible constitution of the head stage of the circuit of FIG. 3.

Le mode de réalisation de l'invention qui sera maintenant décrit est destiné à équiper un volume d'écoute parallélépipédique, ce qui est la forme habituelle d'une pièce d'habitation. Lorsque, comme dans le cas montré en figures 1 et 2, la pièce a une longueur et une largeur différentes, l'ensemble de restitution comportera deux enceintes 10a et 10b placées à proximité d'un des murs formant la largeur de la pièce dans les angles de celle-ci. Ces deux enceintes 10a et 10b sont avantageusement placées de façon que leur base soit environ 15 cm au-dessus de la tête de l'auditeur lorsque celui-ci est dans sa position d'écoute. Cette disposition profite du caractère non homogène de la perception auditive. Deux autres enceintes 12a et 12b sont placées de la façon suivante: à partir de la projection des enceintes 10a et 10b sur le plancher, on trace deux lignes faisant un angle a d'environ 35 à 40° avec les murs latéraux. Les enceintes 12a et 12b seront placées à la verticale de ces lignes, à une hauteur ho telle que leur sommet soit à peu près au niveau de la poitrine de l'auditeur, afin d'éviter une perception trop axiale de ces enceintes. Le rapport entre les écartements 12 des enceintes 12a-12b et 1, des enceintes 10a-10b sera de l'ordre de 0,6. Si par exemple 1,=3,3 m, la distance 12 entre les enceintes 12a et 12b sera de l'ordre de 2 m.The embodiment of the invention which will now be described is intended to equip a parallelepipedic listening volume, which is the usual form of a living room. When, as in the case shown in FIGS. 1 and 2, the room has a different length and width, the restitution assembly will comprise two enclosures 10a and 10b placed near one of the walls forming the width of the room in the angles of it. These two speakers 10a and 10b are advantageously placed so that their base is approximately 15 cm above the listener's head when the latter is in his listening position. This arrangement takes advantage of the non-homogeneous nature of auditory perception. Two other enclosures 12a and 12b are placed in the following manner: from the projection of the enclosures 10a and 10b on the floor, two lines are drawn making an angle a of approximately 35 to 40 ° with the side walls. The speakers 12a and 12b will be placed vertical to these lines, at a height h o such that their apex is approximately at the level of the listener's chest, in order to avoid an overly axial perception of these speakers. The ratio between the spacings 12 of the enclosures 12a-12b and 1, of the enclosures 10a-10b will be of the order of 0.6. If for example 1, = 3.3 m, the distance 1 2 between the speakers 12a and 12b will be of the order of 2 m.

Les deux enceintes 10a et 12a seront alimentées par l'une des voies d'un chaîne de restitution stéréophonique qui peut être de nature classique, les enceintes 10b et 12b par l'autre voie. Toutes ces enceintes seront avantageusement de type maniature, afin de diminuer les possibilités de localisation individuelle de ces enceintes par l'oreille. Elles pourront être complétées par des caissons de basse.The two speakers 10a and 12a will be supplied by one of the channels of a stereophonic reproduction chain which may be of a conventional nature, the speakers 10b and 12b by the other channel. All of these speakers will advantageously be of the maniature type, in order to reduce the possibilities of individual location of these speakers by the ear. They can be supplemented by subwoofers.

L'ensemble de propagation destiné à simuler les réverbérations par le fond de la pièce comporte, dans son mode de réalisation le plus simple, deux enceintes 14a et 14b placées à proximité du mur opposé à celui qui reçoit les enceintes 10a et 10b. Leur hauteur h, correspond à la hauteur d'oreilles de l'auditeur.The propagation assembly intended to simulate the reverberations from the bottom of the room comprises, in its simplest embodiment, two enclosures 14a and 14b placed near the wall opposite to that which receives the enclosures 10a and 10b. Their height h corresponds to the ear height of the listener.

Les enceintes 14a, 14b sont alimentées par un circuit du genre montré en figure 3. Ce circuit s'ajoute à un circuit dereproduction stéréophonique classique 18, pouvant être de constitution quelconque, comportant des organes classiques de lecture et de pré-amplification, schématisés en 20, et un amplificateur de puissance 22 alimentant les enceintes 10 et 12. Le circuit comporte, dans la version qui incorpore les connexions montrées en tirets sur lu figure 3, un étage de tête 24 qui remplit notamment la fonction de sommateur des signaux des deux voies stéréophoniques prélevés sur le pré-amplificateur 20. Cette sommation permet de mélanger les signaux stéréophoniques comme sont mélangées, dans une salle de spectacle ou de concert, les ondes sonores provenant de la scène lorsqu'elles arrivent à proximité du fond de la salle.The speakers 14a, 14b are supplied by a circuit of the kind shown in FIG. 3. This circuit is added to a conventional stereophonic reproduction circuit 18, which may be of any constitution, comprising conventional organs for reading and pre-amplification, shown diagrammatically in 20, and a power amplifier 22 supplying the speakers 10 and 12. The circuit comprises, in the version which incorporates the connections shown in dashes in FIG. 3, a head stage 24 which fulfills in particular the function of summing the signals of the two stereophonic channels taken from the preamplifier 20. This summation makes it possible to mix the stereophonic signals as are mixed, in a concert hall or concert hall, the sound waves coming from the stage when they arrive near the back of the hall.

Le signal provenant du circuit de tête 24 est ensuite appliqué à une ligne à retard 26 qui le retient un temps variable selon la longueur de la salle que l'on désire simuler, en tenant compte que 100 ms correspondent à 34 m environ. Le signal sortant de la ligne à retard 26 est ensuite envoyé dans un mélangeur 28 qui reçoit également, par l'intermédiaire d'une ligne directe 30 munie d'un potentiomètre 32 d'ajustement, une composante non retardée. Une fraction du signal sortant de la ligne à retard est renvoyée en amont de cette ligne à travers un filtre 34 destiné à atténuer les sons au-delà d'une fréquence de 500 Hz environ. La courbe de réponse de ce filtre pourra avantageusement présenter une atténuation particulièrement marquée pour une fréquence intermédiaire, entre 500 Hz et 1 kHz environ. Enfin, le signal de sortie du mélangeur 28 attaque un amplificateur de puissance 36 relié aux enceintes 14a et 14b. Dans le cas où la ligne à retard 26 est à plusieurs éléments, le circuit peut comporter des moyens permettant de réinjecter le signal ayant traversé le filtre 34 plus ou moins vers l'entrée de la ligne à retard, pour modifier la sensation de volume.The signal from the head circuit 24 is then applied to a delay line 26 which retains it for a variable time depending on the length of the room which it is desired to simulate, taking into account that 100 ms corresponds to approximately 34 m. The signal leaving the delay line 26 is then sent to a mixer 28 which also receives, via a direct line 30 provided with an adjustment potentiometer 32, an undelayed component. A fraction of the signal leaving the delay line is returned upstream of this line through a filter 34 intended to attenuate sounds beyond a frequency of approximately 500 Hz. The response curve of this filter may advantageously have a particularly marked attenuation for an intermediate frequency, between 500 Hz and 1 kHz approximately. Finally, the output signal from the mixer 28 drives a power amplifier 36 connected to the speakers 14a and 14b. In the case where the delay line 26 has several elements, the circuit may include means making it possible to reinject the signal having passed through the filter 34 more or less towards the input of the delay line, to modify the sensation of volume.

Le circuit comporte encore les potentiomètres ou rhéostats usuels de réglage de volume et d'équilibrage.The circuit also includes the usual potentiometers or rheostats for volume adjustment and balancing.

Dans une réalisation particulièrement favorable du point de vue acoustique, la ligne à retard 26 du circuit de la figure 3 utilise des circuits à transfert de charge associés à une horloge à fréquence élevée (typiquement 200 kHz) et le circuit de tête 24 peut alors avoir la constitution montrée en figure 1. Le mélangeur-séparateur d'entrée 38 attaque un filtre actif du deuxième ordre 40, destiné à couper les fréquences dépassant la bande audio. Ce filtre attaque, à travers un séparateur-adaptateur d'impédance 42, un circuit de compression de dynamique 44 (utilisant par exemple un circuit intégré NE 571) rendu nécessaire par l'emploi d'une ligne à retard à transfert de charge. Cette ligne à retard comporte un circuit d'échantilonnage, chaque échantillon étant stocké dans un condensateur, puis transféré dans un autre, cette technique permettant aisément de réintroduire le signal en retour provenant du filtre 34 à un étage variable.In a particularly favorable embodiment from the acoustic point of view, the delay line 26 of the circuit of FIG. 3 uses charge transfer circuits associated with a high frequency clock (typically 200 kHz) and the head circuit 24 can then have the constitution shown in FIG. 1. The input mixer-separator 38 drives an active second order filter 40, intended to cut the frequencies exceeding the audio band. This filter drives, through an impedance separator-adapter 42, a dynamic compression circuit 44 (using for example an integrated circuit NE 571) made necessary by the use of a transfer delay line dump. This delay line includes a sampling circuit, each sample being stored in a capacitor, then transferred to another, this technique making it easy to reintroduce the return signal from the filter 34 at a variable stage.

Le circuit de la figure 3 peut être complété par un filtre supplémentaire, immédiatement en amont de l'amplificateur 36, permettant de modeler la réponse aux fréquences élevées et de simuler une salle de spectacle. Ce filtre peut être muni d'un commutateur pour affaiblir le signal, par exemple à raison de 3 dB par octave, à partir d'une fréquence haute variable. On peut par exemple prévoir quatre positions, correspondant à un affaiblissement à partir de 4, 6, 8 et 10 kHz.The circuit of FIG. 3 can be completed by an additional filter, immediately upstream of the amplifier 36, making it possible to model the response at high frequencies and to simulate a performance hall. This filter can be fitted with a switch to weaken the signal, for example at the rate of 3 dB per octave, from a high variable frequency. We can for example provide four positions, corresponding to a loss from 4, 6, 8 and 10 kHz.

Dans une variante de réalisation, un circuit du genre montré en figure 3 est associé à chacune des enceintes 14a et 14b. Dans ce cas, les connexions indiquées en tirets sont supprimées sur la figure 3 est un circuit supplémentaire est branché sur la sortie 48.In an alternative embodiment, a circuit of the kind shown in FIG. 3 is associated with each of the speakers 14a and 14b. In this case, the connections indicated in dashes are deleted in FIG. 3 and an additional circuit is connected to the output 48.

Comme indiqué en figure 2, l'ensemble de propagation peut comporter une paire supplémentaire d'enceintes 16a, 16b situées de chaque côté de la pièce et approximativement à mi-longueur de celle-ci. Ces deux enceintes pourront être placées sur deux lignes reliant chacune l'enceinte avant de l'ensemble de restitution à l'enceinte de l'ensemble de propagation correspondante. Chacune de ces enceintes 16a, 16b est associé à un circuit d'alimentation du genre montré en trait plein en figure 3, raccordé à la sortie du pré-amplificateur 20.As shown in Figure 2, the propagation assembly may include an additional pair of speakers 16a, 16b located on each side of the room and approximately mid-length thereof. These two enclosures may be placed on two lines each connecting the front enclosure of the restitution assembly to the enclosure of the corresponding propagation assembly. Each of these speakers 16a, 16b is associated with a power supply circuit of the type shown in solid lines in FIG. 3, connected to the output of the preamplifier 20.

Les deux enceintes supplémentaires 16a et 166 permettent de simuler la réverbération des murs latéraux, fonction de la largeur et de la réflexivité des parois de la salle.The two additional speakers 16a and 166 make it possible to simulate the reverberation of the side walls, depending on the width and the reflectivity of the walls of the room.

On voit que le dispositif, dans sa réalisation la plus élaborée, permet de simuler la largeur et la longueur de la pièce, grâce aux lignes à retard; la nature des parois, grâce aux filtres; l'intensité des réflexions successives, grâce aux réinjections de signaux; et les mélanges grâce aux sommateurs.We see that the device, in its most elaborate embodiment, makes it possible to simulate the width and the length of the room, thanks to the delay lines; the nature of the walls, thanks to the filters; the intensity of successive reflections, thanks to the reinjection of signals; and mixtures thanks to the summers.

Comme on l'a indiqué plus haut, il est avantageux d'utiliser des enceintes acoustiques miniatures, dont le volume peut se réduire à quelconque décimètres cube, afin de diminuer l'encombrement et également de profiter de leurs propriétés favorables du point de vue de la localisation des sources sonores.As indicated above, it is advantageous to use miniature loudspeakers, the volume of which can be reduced to any cubic decimetres, in order to reduce the bulk and also to take advantage of their favorable properties from the point of view of the location of sound sources.

L'invention est susceptible de nombreuses variantes. En particulier, il est possible d'utiliser le même circuit à ligne à retard pour alimenter les enceintes arrière 14 et les enceintes 16.The invention is susceptible of numerous variants. In particular, it is possible to use the same delay line circuit to supply the rear speakers 14 and the speakers 16.

Claims (5)

1. Device for sound reproduction in several dimensions from a stereo record, comprising, in addition to a stereo system, at least a pair of additional speaker units (14a, 14b) intended to be located opposite to the speaker units (10a, 10b) of the stereo system in a room, and a circuit for feeding the pair of additional speaker units (14a, 14b) from the signals which drive the speaker units of the stereo system, said circuit having a delay line (26) which receives the driving signal, part of the output signal of the delay line being combined with a direct non-delayed signal and another part being fed back upstream of the delay line, characterized in that the circuit for feeding the pair of additional speaker units comprises a common head circuit (24) provided with a mixer for mixing the input signals of the two stereo signals from the stereo system and in that said other part is fed back through an attenuating filter for attenuation from a frequency of about 500 Hz.
2. Device according to claim 1, characterized in that the stereo system comprises two speaker units for each of the two paths, the four speaker units (10a, 10b; 12a, 12b) being located approximately according to a trapezium, the two speaker units (10a, 10b) which are located along the large base of the trapezium being at the same height and close to two opposed corners of the room, crosswise of the room, while the other two speakers units (12a, 12b) are located at a lower height and are closer to the location of the hearer.
3. Device according to claim 2, characterized in that the four speaker units are so located that the projection on the ground of the sides of the trapezium are at an angle of from 30° to 40° approximately with the larger size of the room.
4. Device according to any one of the preceding claims, characterized in that it comprises two lateral speaker units, located at midlength of the room, each fed with a circuit which is similar to that which feeds the additional speaker units (14a, 14b).
5. Device according to any one of the preceding claims, characterized in that the speaker units are miniature speaker units, whose volume is of some cubic decimeters.
EP82401528A 1982-08-13 1982-08-13 Device for the sonic reproduction of a stereophonic record Expired EP0100805B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP82401528A EP0100805B1 (en) 1982-08-13 1982-08-13 Device for the sonic reproduction of a stereophonic record
DE8282401528T DE3274408D1 (en) 1982-08-13 1982-08-13 Device for the sonic reproduction of a stereophonic record

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82401528A EP0100805B1 (en) 1982-08-13 1982-08-13 Device for the sonic reproduction of a stereophonic record

Publications (2)

Publication Number Publication Date
EP0100805A1 EP0100805A1 (en) 1984-02-22
EP0100805B1 true EP0100805B1 (en) 1986-11-20

Family

ID=8189935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401528A Expired EP0100805B1 (en) 1982-08-13 1982-08-13 Device for the sonic reproduction of a stereophonic record

Country Status (2)

Country Link
EP (1) EP0100805B1 (en)
DE (1) DE3274408D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4837825A (en) * 1987-02-28 1989-06-06 Shivers Clarence L Passive ambience recovery system for the reproduction of sound
JP6668636B2 (en) * 2015-08-19 2020-03-18 ヤマハ株式会社 Audio systems and equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1170469B (en) 1960-09-29 1964-05-21 Western Electric Co Electronic reverberation generator for changing the reverberation characteristics of acoustic signals
DE1196711B (en) 1960-10-12 1965-07-15 Deutsche Post Rundfunk Compatible procedure for monophonic, stereophonic, monophonic or stereo-ambiophonic recording, transmission and playback

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710023A (en) * 1971-09-27 1973-01-09 Int Technical Dev Corp Sound reproducing system for a four speaker stereo utilizing signal expansion and signal delay
US4105864A (en) * 1975-07-17 1978-08-08 Teledyne Industries, Inc. Stereo and spaciousness reverberation system using random access memory and multiplex
US4053711A (en) * 1976-04-26 1977-10-11 Audio Pulse, Inc. Simulation of reverberation in audio signals
US4039755A (en) * 1976-07-26 1977-08-02 Teledyne, Inc. Auditorium simulator economizes on delay line bandwidth
US4283600A (en) * 1979-05-23 1981-08-11 Cohen Joel M Recirculationless concert hall simulation and enhancement system
FR2501448A1 (en) * 1981-03-06 1982-09-10 Henri Chesnard Three=dimensional sound reproduction system - has four impedance matching circuits, low-pass filter, integrated dynamic compressor and clocked delay line

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1170469B (en) 1960-09-29 1964-05-21 Western Electric Co Electronic reverberation generator for changing the reverberation characteristics of acoustic signals
DE1196711B (en) 1960-10-12 1965-07-15 Deutsche Post Rundfunk Compatible procedure for monophonic, stereophonic, monophonic or stereo-ambiophonic recording, transmission and playback

Also Published As

Publication number Publication date
EP0100805A1 (en) 1984-02-22
DE3274408D1 (en) 1987-01-08

Similar Documents

Publication Publication Date Title
JP3803368B2 (en) Binaural signal processor
US6771778B2 (en) Method and signal processing device for converting stereo signals for headphone listening
CA1280376C (en) Stereophonic soundbox
EP0015186B1 (en) Three-channel acoustic system
FR2638312A1 (en) BINAURAL STEREOPHONIC RECORDING OR REPRODUCTION METHOD FOR AUDIO SIGNALS PRESENTED BY A HEADPHONES
EP1728409A1 (en) Sound device provided with a geometric and electronic radiation control
EP0100805B1 (en) Device for the sonic reproduction of a stereophonic record
HUP0203764A2 (en) Method and arrangement for recording and playing back sounds
FR3065137A1 (en) SOUND SPATIALIZATION METHOD
CA2928995C (en) Sound system with improved adjustable directivity
Mathews 1 The Ear and How It Works
FR2501448A1 (en) Three=dimensional sound reproduction system - has four impedance matching circuits, low-pass filter, integrated dynamic compressor and clocked delay line
JPH06217400A (en) Acoustic equipment
FR3114209A1 (en) SOUND REPRODUCTION SYSTEM WITH VIRTUALIZATION OF THE REVERBERE FIELD
WO2013060761A1 (en) Acoustic chamber including a coaxial loudspeaker having a controlled and variable directivity
EP3701730A1 (en) Spatial arrangement of sound broadcasting devices
WO1992005673A1 (en) Polyphonic room with homogeneous sound and installation of the same type
BE1015649A3 (en) Sound e.g. noise, reproduction system for creating three dimensional auditory space, has acoustic apparatuses having components whose sound power is equal to generate acoustic sensation to create spatial perception of sound environment
Liski et al. Equalization of Wood-Panel Loudspeakers
JP3949826B2 (en) Sound playback device
CA2050622A1 (en) Method and device for improving the reproduction quality of stereo ambience sound
Woszczyk A new method for spatial enhancement in stereo and surround recording
FR2507049A1 (en) DEVICE FOR PRODUCING A SIGNAL ON MULTIPLE CHANNELS FROM A STEREOPHONIC SIGNAL
WO2007020340A1 (en) Armchair comprising an electroacoustic device
GB2370176A (en) A simple microphone unit for the vertical localisation and enhancement of live sounds

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT NL

17P Request for examination filed

Effective date: 19831231

ITF It: translation for a ep patent filed

Owner name: AVV. ANTONIO PETRUZZELLI

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT NL

REF Corresponds to:

Ref document number: 3274408

Country of ref document: DE

Date of ref document: 19870108

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870831

Year of fee payment: 6

26 Opposition filed

Opponent name: GRUNDIG E.M.V. ELEKTRO-MECHANISCHE VERSUCHSANSTALT

Effective date: 19870818

NLR1 Nl: opposition has been filed with the epo

Opponent name: GRUNDIG E.M.V. ELEKTRO-MECHANISCHE VERSUCHSANSTALT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19890301

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19890503

GBPC Gb: european patent ceased through non-payment of renewal fee
RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state
27W Patent revoked

Effective date: 19890602