EP0379988B1 - Enceinte acoustique - Google Patents

Enceinte acoustique Download PDF

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Publication number
EP0379988B1
EP0379988B1 EP90101078A EP90101078A EP0379988B1 EP 0379988 B1 EP0379988 B1 EP 0379988B1 EP 90101078 A EP90101078 A EP 90101078A EP 90101078 A EP90101078 A EP 90101078A EP 0379988 B1 EP0379988 B1 EP 0379988B1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
chassis
volume
enclosure
loudspeaker chassis
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.)
Revoked
Application number
EP90101078A
Other languages
German (de)
English (en)
Other versions
EP0379988A1 (fr
Inventor
Ernst Georg Dipl.-Bio Beck
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.)
R and H STUDIOSOUND BECK KG
Original Assignee
R and H STUDIOSOUND BECK KG
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Publication date
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Application filed by R and H STUDIOSOUND BECK KG filed Critical R and H STUDIOSOUND BECK KG
Publication of EP0379988A1 publication Critical patent/EP0379988A1/fr
Application granted granted Critical
Publication of EP0379988B1 publication Critical patent/EP0379988B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band

Definitions

  • the invention relates to a loudspeaker box based on the acoustic bandpass principle with an outer housing, an inner baffle and attached loudspeaker chassis and chambers located on both sides of the inner baffle, each with at least one reflex opening, and is based on DE-A-29 06 002.
  • Loudspeakers are known according to different acoustic principles.
  • An acoustic principle is the bandpass system, in which a defined frequency range can be emitted from an existing frequency spectrum solely by the housing construction and the arrangement of the loudspeaker chassis.
  • loudspeakers that work according to other acoustic principles, such as the closed box, the reflex system, etc.
  • electrical or electronic crossovers are required in order to be able to radiate certain frequency ranges.
  • DE-A1-29 06 002 is already known, which works with two loudspeakers that are acoustically connected in series to increase the membrane acceleration are. Closed or open boxes based on the bass reflex system are used as the outer housing.
  • a loudspeaker box according to the bandpass system is also known, in which a loudspeaker chassis is arranged within a housing and two separate chambers are provided.
  • This speaker box is used in particular to emit the bass range at a frequency e.g. less than 500 Hertz.
  • a comparatively large chamber volume and thus an overall correspondingly large outer housing is required at a low frequency range.
  • Such so-called "subwoofers” are used primarily in the sound reinforcement area of musicians or in studios and for hi-fi applications.
  • the size of the loudspeaker box plays a significant role, since these usually have to be removed after the performance and have to be rebuilt at another location. Even at the place of use, there is usually a limited amount of space, which often also does not allow optimal placement of large (bass) loudspeakers.
  • the object of the present invention is to create a loudspeaker box of the type mentioned at the outset which has a substantially reduced housing volume for a predetermined frequency range or which allows the frequency bandwidth to be increased while the housing volume remains the same. At the same time, the load capacity of the loudspeaker box should be increased and the distortion reduced.
  • the invention proposes, in particular, that at least two loudspeaker chassis connected in series acoustically via coupling volumes are provided in the bandpass housing and operate acoustically in phase.
  • a particularly advantageous embodiment provides that an inner baffle with two loudspeaker chassis attached to it and enclosing a coupling volume is provided.
  • This embodiment has the advantage that good acoustic data and practically halved housing volume can be used with little effort, since only two loudspeaker chassis are used here.
  • the two loudspeakers are arranged with their membrane front sides facing one another.
  • the coupling volume is formed between the front sides of the membrane, the membranes forming the boundary walls.
  • the arrangement of several loudspeakers according to the invention enables the distortions that occur to be reduced even further. It is expediently provided that the chamber volumes and / or the reflex openings are different and that two identical loudspeaker chassis are provided. This significantly simplifies production, since two identical loudspeaker systems can be used, and also the tuning of the chamber or the overall loudspeaker box is considerably simplified, since the chamber volume and / or the reflex openings can be changed easily. On the other hand, there is also the possibility of designing the chamber volumes and / or the reflex openings approximately the same, and then providing two loudspeaker chassis with different electro-acoustic parameters. In this case, different and adapted speakers must be used accordingly.
  • the coupling volume or volumes is sealed off from adjacent chambers or from adjacent coupling volumes.
  • This dense coupling volume contributes to a largely "rigid” coupling of the two systems, so that the distortions that occur can be kept comparatively small.
  • a modified embodiment of the invention provides that several inner baffles are provided, each with one or more loudspeaker chassis attached to it. This enables a further reduction in the housing volume with the same frequency response. This also gives the loudspeaker a higher load capacity.
  • a loudspeaker box 1 shown in FIGS. 1 and 2 has an outer housing 2 in which there is an inner baffle 3 with loudspeaker chassis 4, 4a attached to it.
  • the inner baffle 3 separates two chambers 5, 5a located within the housing 2, each of which is connected to the outside area by a reflex opening 7 or 7a on the front 9 of the loudspeaker box.
  • the reflex openings 7, 7a can be formed by housing wall openings, and in variant embodiments, tunnel openings with an extended passage channel can also be provided here.
  • the size of the reflex openings 7, 7a and also their special design, possibly with tunnels or the like, are used to coordinate the loudspeaker box 1. It can be clearly seen in the figures that the chamber volumes are different.
  • the same loudspeaker chassis are used here, so that different acoustic data are obtained by the different chamber volumes, which determine the lower and the upper corner frequency of the bandpass.
  • the reflex openings are accordingly designed differently, the smaller-volume chamber having the larger reflex opening 7 and the other chamber 5a having the smaller reflex opening 7a.
  • the two loudspeaker chassis 4, 4a are arranged with their membrane front sides 8 facing one another and, with their membranes, delimit a coupling volume 6 located between them. This coupling volume 6 is sealed off from the respective chamber volume by the membranes.
  • the loudspeaker chassis are acoustically connected in series and work acoustically in phase, so that the membranes are deflected parallel to one another.
  • the arrangement of the loudspeaker chassis shown with mutually facing diaphragm front sides enables particularly simple assembly and also results in the smallest possible coupling volume 6.
  • This smallest possible coupling volume is aimed at on the one hand to keep the total volume of the loudspeaker box small and on the other hand to keep the distortion of the individual loudspeaker systems as rigid as possible To largely compensate coupling via a small coupling volume. Measurements have shown that the harmonic distortion is approx. 10 dB lower than when using bandpass loudspeakers with a chassis that were previously common.
  • FIGS. 1 and 2 show the frequency response of a bandpass loudspeaker box according to FIGS. 1 and 2 simulated with the aid of a computer.
  • the ordinate shows the sound pressure in decibels and the abscissa the frequency.
  • the -3 dB line results in a frequency range from approximately 40 Hertz to approximately 220 Hertz. Since the loudspeaker box according to the invention is a higher-order bandpass system, the edges of the frequency transmission range are also corresponding correspondingly steeper than with previously common systems.
  • This network gives a tenth order transfer function.
  • This analog circuit diagram also shows that when the same loudspeaker chassis is used, the housing volume is halved.
  • Fig. 3 shows a bandpass speaker box 1a, which has four inner baffles 3, each with a speaker chassis 4 attached to it.
  • the coupling volumes 6 are here each delimited by the membranes of adjacent loudspeakers and by their baffles 3 and are sealed off by the baffles 3 and the membranes with respect to an adjoining chamber 5, 5a or adjoining coupling volumes 6.
  • only a quarter of the housing volume that is otherwise equipped with a loudspeaker is required.
  • the load capacity is four times higher.
  • This bandpass loudspeaker has a twelfth order transfer function.
  • the loudspeaker chassis 4, 4a, 4b, 4c used work acoustically in phase, the membranes being deflected practically in parallel in the same directions.
  • the loudspeaker chassis 4, 4a facing each other in FIGS. 1 and 2 with their membrane front sides 8 can also be arranged on the inner baffle 3 facing away from one another. In this case there is a corresponding sealing of the coupling volume located between them 6, which is then delimited by the membrane backs.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Claims (7)

  1. Enceinte acoustique, travaillant selon le principe acoustique du passe-bande avec un boîtier extérieur (2), une paroi acoustique (3) intérieure ou une série de parois acoustiques intérieures et un châssis de haut-parleur (4, 4a) monté dessus, ainsi que des chambres (5, 5a) se trouvant de deux côtés de la paroi acoustique (3) intérieure ou de la rangée de parois acoustiques intérieures avec chaque fois au moins une ouverture de réflexion (7a, 7b), caractérisée en ce qu'au moins deux châssis de haut-parleur (4, 4a) montés acoustiquement en série par l'intermédiaire de cavité de couplage (6a) sont prévus dans le boîtier passe-bande et travaillent acoustiquement en phase.
  2. Enceinte acoustique selon la revendication 1, caractérisée en ce qu'une paroi acoustique (3) avec deux châssis de haut-parleur (4, 4a) montés dessus et enclosant entre eux une cavité de couplage (4) sont prévus.
  3. Enceinte acoustique selon la revendication 2, caractérisée en ce que les deux châssis de haut-parleur (4, 4a) sont disposés tournés l'un vers l'autre par leurs faces avant de membrane (8).
  4. Enceinte acoustique selon l'une des revendications 1 à 3, caractérisée en ce que la cavité de chambre et/ou les ouvertures de réflexion (7, 7a) sont différentes et que deux châssis de haut-parleur (4, 4a) identiques sont prévus.
  5. Enceinte acoustique selon l'une des revendications 1 à 3, caractérisée en ce que la cavité de chambre et/ou les ouvertures de réflexion (7, 7a) sont à peu prés identiques et que deux châssis de haut-parleur (4, 4a) différents au point de vue de leurs caractéristiques électroacoustiques sont prévus.
  6. Enceinte acoustique selon l'une des revendications 1 à 5, caractérisée en ce que la, respectivement les, cavités de couplage (6) sont délimitées vis-à-vis des chambres (5, 5a) limitrophes, respectivement des cavités de couplage voisines.
  7. Enceinte acoustique selon l'une des revendications 1 à 6, caractérisée en ce que plusieurs parois acoustiques (3) intérieures sont prévues avec chaque fois un ou plusieurs châssis de haut-parleur (4, 4a, 4b, 4c) montés dessus.
EP90101078A 1989-01-27 1990-01-19 Enceinte acoustique Revoked EP0379988B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3902343 1989-01-27
DE3902343A DE3902343A1 (de) 1989-01-27 1989-01-27 Lautsprecherbox

Publications (2)

Publication Number Publication Date
EP0379988A1 EP0379988A1 (fr) 1990-08-01
EP0379988B1 true EP0379988B1 (fr) 1994-07-13

Family

ID=6372871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101078A Revoked EP0379988B1 (fr) 1989-01-27 1990-01-19 Enceinte acoustique

Country Status (4)

Country Link
EP (1) EP0379988B1 (fr)
AT (1) ATE108597T1 (fr)
DE (2) DE3902343A1 (fr)
ES (1) ES2058613T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29608421U1 (de) * 1996-05-09 1996-08-01 Nokia (Deutschland) Gmbh, 75175 Pforzheim Subwoofer-Lautsprecherbox
DE19734120A1 (de) * 1997-08-07 1999-02-18 Nokia Deutschland Gmbh Tonwiedergabeanordnung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1728058A1 (de) * 1968-08-20 1972-03-23 Bauer Carl Fa Verfahren zum Befestigen von insbesondere bruchempfindlichen Gegenstaenden mit einem Bolzensetzwerkzeug
GB1500711A (en) * 1974-01-26 1978-02-08 Tiefenbrun I Loudspeaker systems
US4016953A (en) * 1975-05-23 1977-04-12 Butler Robert J Push-pull transducer system
FR2338616A1 (fr) * 1976-01-16 1977-08-12 Leon Joseph Emetteur de son
DE2837520A1 (de) * 1978-08-28 1980-03-27 Harald Schuster Lautsprecher, passiv servokontrolliert mit korrektur der phasendrehung
DE2906002B2 (de) * 1979-02-16 1980-08-21 Hans Deutsch Akustikforschung Und Lautsprecherentwicklung Gmbh, Salzburg (Oesterreich) Lautsprecheranordnung

Also Published As

Publication number Publication date
EP0379988A1 (fr) 1990-08-01
DE3902343A1 (de) 1990-08-02
ES2058613T3 (es) 1994-11-01
DE59006384D1 (de) 1994-08-18
ATE108597T1 (de) 1994-07-15

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