EP0100805B1 - Gerät zur Schallwiedergabe einer stereophonen Aufzeichnung - Google Patents

Gerät zur Schallwiedergabe einer stereophonen Aufzeichnung Download PDF

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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
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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
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English (en)
French (fr)
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EP0100805A1 (de
Inventor
Henry Chesnard
Dominique Perruchon
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to EP82401528A priority Critical patent/EP0100805B1/de
Priority to DE8282401528T priority patent/DE3274408D1/de
Publication of EP0100805A1 publication Critical patent/EP0100805A1/de
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    • 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.

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

Claims (5)

1. Gerät zur Wiedergabe von Schall in mehreren Dimensionen auf der Grundlage einer stereophonen Aufzeichnung, mit wenigstens einem Paar zusätzlicher Lautsprecher (14a, 14b) in einer weiteren stereophonen Anordnung, die dazu bestimmt sind, gegenüber Lautsprechern (10a, 10b) der stereophonen Anordnung in einem Zuhörerraum angeordnet zu werden, und mit einem Kreis zum Versorgen des Paares zusätzlicher Lautsprecher (14a, 14b) auf der Grundlage von Signalen zum Erregen der Lautsprecher der stereophonen Anordnung, wobei der Versorgungskreis eine Verzögerungsleitung (26) aufweist, die das Erregungssignal erhält, und wobei ein Teil der Ausgangssignals der Verzögerungsleitung mit einem unverzögerten, direkten Signal kombiniert und ein anderer Teil vor die Verzögerungsleitung zurückgeführt wird, dadurch gekennzeichnet, daß der Kreis zur Versorgung des Paares zusätzlicher Lautsprecher einen gemeinsamen Hauptkreis (24) aufweist, der mit einem Mischer für die Eingangssignale der beiden Stereophonie-Ausgangskanäle der stereophonen Anordnung versehen ist, und daß der erwähnte andere Teil über ein Filter (34) zum Dämpfen ab einer Frequenz von etwa 500 Hz zurückgeführt wird.
2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß die stereophone Anordnung für jeden der beiden Kanäle zwei Lautsprecher aufweist, wobei die vier Lautsprecher (10a, 10b; 12a, 12b) etwa in Form eines Trapezes angeordnet sind und die beiden längs der Grundlinie des Trapezes angeordneten Lautsprecher (10a, 10b) auf gleicher Höhe und in der Nähe von zwei sich in Richtung der Breite des Raumes gegenüberliegenden Ecken des Raumes angeordnet sind, während die anderen Lautsprecher (12a, 12b) in geringerer Höhe und näher am Zuhörort angeordnet sind.
3. Gerät nach Anspruch 2, dadurch gekennzeichnet, daß die vier Lautsprecher so angeordnet sind, daß die Projektion der Seiten des Trapezes auf den Fußboden einen Winkel von etwa 30 bis 40° mit der Längsrichtung des Raumes einschließen.
4. Gerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß es zwei seitliche Lautsprecher aufweist, die etwa in der Mittel der Länge des Raumes angeordnet sind und jeweils durch einen ähnlichen Kreis wie den versorgt werden, der die zusätzlichen Lautsprecher (14a, 14b) versorgt.
5. Gerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Lautsprecher Miniaturlautsprecher mit einem Volumen von einigen Kubikdezimetern sind.
EP82401528A 1982-08-13 1982-08-13 Gerät zur Schallwiedergabe einer stereophonen Aufzeichnung Expired EP0100805B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP82401528A EP0100805B1 (de) 1982-08-13 1982-08-13 Gerät zur Schallwiedergabe einer stereophonen Aufzeichnung
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 (de) 1982-08-13 1982-08-13 Gerät zur Schallwiedergabe einer stereophonen Aufzeichnung

Publications (2)

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EP0100805A1 EP0100805A1 (de) 1984-02-22
EP0100805B1 true EP0100805B1 (de) 1986-11-20

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EP82401528A Expired EP0100805B1 (de) 1982-08-13 1982-08-13 Gerät zur Schallwiedergabe einer stereophonen Aufzeichnung

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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 (ja) * 2015-08-19 2020-03-18 ヤマハ株式会社 オーディオシステムおよびオーディオ機器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1170469B (de) 1960-09-29 1964-05-21 Western Electric Co Elektronischer Nachhallerzeuger zum AEndern der Nachhallkennlinie akustischer Signale
DE1196711B (de) 1960-10-12 1965-07-15 Deutsche Post Rundfunk Kompatibles Verfahren zur wahlweisen monofonen, stereofonen, mono-ambiofonen oder stereo-ambiofonen Aufnahme, UEbertragung und Wiedergabe

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 (fr) * 1981-03-06 1982-09-10 Henri Chesnard L'holophonie

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1170469B (de) 1960-09-29 1964-05-21 Western Electric Co Elektronischer Nachhallerzeuger zum AEndern der Nachhallkennlinie akustischer Signale
DE1196711B (de) 1960-10-12 1965-07-15 Deutsche Post Rundfunk Kompatibles Verfahren zur wahlweisen monofonen, stereofonen, mono-ambiofonen oder stereo-ambiofonen Aufnahme, UEbertragung und Wiedergabe

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

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