EP0037139A1 - Enceinte acoustique - Google Patents

Enceinte acoustique Download PDF

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Publication number
EP0037139A1
EP0037139A1 EP81200291A EP81200291A EP0037139A1 EP 0037139 A1 EP0037139 A1 EP 0037139A1 EP 81200291 A EP81200291 A EP 81200291A EP 81200291 A EP81200291 A EP 81200291A EP 0037139 A1 EP0037139 A1 EP 0037139A1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
housing
rear wall
partition
sound
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.)
Withdrawn
Application number
EP81200291A
Other languages
German (de)
English (en)
Inventor
Hanspeter Tobler
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.)
Stifag Bauplanungs AG
Original Assignee
Stifag Bauplanungs AG
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
Application filed by Stifag Bauplanungs AG filed Critical Stifag Bauplanungs AG
Publication of EP0037139A1 publication Critical patent/EP0037139A1/fr
Withdrawn legal-status Critical Current

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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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure 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
    • 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 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers

Definitions

  • the invention relates to a loudspeaker box according to the preamble of patent claim 1.
  • German layout specification No. 25 25 308 describes a loudspeaker box which has vertical side walls, a vertical rear wall and horizontal top and bottom sides as well as a front baffle inclined by approximately 15 ° with respect to the vertical room plane. This ensures that the low tones are better emitted. However, the sound pressure within the closed housing is quite large and the freedom of movement of the loudspeaker diaphragm is impaired.
  • a loudspeaker box with a cubic housing is described in Swiss Patent No. 480 769.
  • An additional sound opening is provided in the baffle, which is designed such that the resistive part of the acoustic impedance generated by it influences the movements of the loudspeaker cone in such a way that the actual electrical impedance of the loudspeaker is at least approximately equal to its nominal impedance, and that the reactive part of the acoustic impedance is so low compared to the resistive part that the extent of the sound radiation at the resonance frequency of the system from the further sound opening is negligible compared to speaker radiation.
  • the loudspeaker box according to the invention is characterized by the features stated in the characterizing part of patent claim 1.
  • FIG. 1 shows the front view of an embodiment of the loudspeaker boxes according to the invention, where with the front cover removed.
  • the front baffle 1 with two woofers 2 and 3 and two mid-range speakers 4 and 5 is visible.
  • two tweeters 7 and 8 are used.
  • the loudspeaker box is placed on a base 9 with a standing plate 10.
  • FIG. 2 shows the side view of the loudspeaker boxes according to FIG. 1.
  • the front cover 11 is partially drawn and consists of a frame 12 and a textile fabric 13 stretched over it.
  • FIG. 3 and 4 show longitudinal sections through the loudspeaker boxes according to FIG. 1.
  • the chamber delimited by the side walls 14, the baffle 1, a rear wall 16, a cover plate 15 and a base plate 17 is divided into three room sections 21, 21 'and 21 "by two inclined partition walls 18 and 19.
  • These room sections are connected to one another via cutouts 23 and 24 in the partition walls 18 and 19, respectively, in order to enable sound pressure equalization occurring high sound pressure distributed over all room sections 21, 21 'and 21 ".
  • the diaphragm of the woofers 2 and 3 is not exposed to any dangerous backlog and can move more freely. Due to the inclination of the partition walls 18 and 19, the woofers in the housing can run dead themselves, i.e. Significantly fewer standing waves occur in the housing because reflections are weakened and at least partially absorbed.
  • the cutouts 23 and 24 in the intermediate walls 18 and 19 can also be arranged at other locations than shown in FIGS. 3 and 4.
  • In front soundproofing elements 25 are preferably used in the cutouts 23 and 24 in order to suppress the tendency to oscillate of the air columns located in the room sections 21, 21 'and 21 ".
  • the soundproofing element 25 comprises two textile fabrics 26 and 27, the edge regions of which are glued along the edge of the cutouts 23 and 24 and on both sides of each of the intermediate walls 18 and 19.
  • the space remaining between the textile fabrics 26 and 27 is filled with a fibrous sound-absorbing material 28.
  • the permanent magnets of the loudspeakers 2, 3, 4, 5, 7 and 8 projecting into the interior of the housing are indicated by dash-dotted circles. It can be seen from FIG. 4 that the permanent magnet of the woofer 3 is partially in the area of the sound-absorbing elements 25. Parts of the resilient, plastically deformable sound damping elements 25 are therefore deformed outwards, but this does not impair their mode of operation in any way.
  • a pressure compensation passage 29 arranged on the rear wall 16.
  • the pressure compensation passage 29 extends between the rear wall 16 and a parallel one partition 30 arranged thereon.
  • rear wall 16 projects beyond partition wall 30 and the slot 31 remaining between the lower end of partition wall 30 and base plate 17 is the entrance to the pressure compensation channel 29.
  • partition wall 30 projects beyond rear wall 16 and extends to the cover plate 15. The slot 32 remaining between the upper end of the rear wall 16 and the cover plate 15 is the outlet of the pressure compensation channel 29.
  • a plate 33 made of sound-absorbing material for example “Navitex” from Kochmann in Zollikofen, Switzerland.
  • the grooves 34 are more clearly visible in the cross-sectional representations of FIGS. 5 and 6.
  • the exit slot 32 can be closed off by a grid or a textile fabric.
  • the lower end of the partition 30 can be cut into a V-shape, for example, so that the space section 21 is also connected directly to the pressure equalization passage 29.
  • All the walls described above are preferably made of wood, e.g. Fibreboard, manufactured.
  • the thickness of the walls is about 30 mm. In the case of small versions of loudspeakers, the wall thickness should not be less than 25 mm.
  • At least the sides of the most heavily loaded walls facing the room sections 21, 21 1 and 21 ", such as the front plate 1 and the intermediate walls 18 and 19, are preferably covered with a lead layer 36 (FIG. 6) provided of about 1.5 mm.
  • the interior of the housing is lined with soundproofing material such as glass fiber mats or glass wool. For reasons of clarity, this sound damping material is not shown in the figures.
  • the low-range, mid-range and high-range loudspeakers are arranged in a phase-linear manner, ie the loudspeaker groups mentioned are arranged set back by about 4 cm compared to the preceding ones, as can best be seen from FIG. 3.
  • the mid-range speakers 4 and 5 are arranged flush with the front panel 1 net, while the woofers 2 and 3 are offset using spacer rings 35, while the tweeters 7 and 8 are arranged in the recessed baffle 6.
  • the loudspeaker box described above has a very good frequency response. There are no rumbling noises and the liter content of the loudspeaker boxes can be reduced by around 20% compared to previously known loudspeaker boxes with the same power output.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP81200291A 1980-03-28 1981-03-14 Enceinte acoustique Withdrawn EP0037139A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH244480 1980-03-28
CH2444/80 1980-03-28

Publications (1)

Publication Number Publication Date
EP0037139A1 true EP0037139A1 (fr) 1981-10-07

Family

ID=4233961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200291A Withdrawn EP0037139A1 (fr) 1980-03-28 1981-03-14 Enceinte acoustique

Country Status (3)

Country Link
EP (1) EP0037139A1 (fr)
JP (1) JPS56149895A (fr)
DK (1) DK104781A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893695A (en) * 1987-06-16 1990-01-16 Matsushita Electric Industrial Co., Ltd. Speaker system
US5169104A (en) * 1991-10-02 1992-12-08 Kwoh Frederick Y S Speaker stand

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE561608C (de) * 1929-08-31 1932-10-15 Lorenz Akt Ges C Elektrischer trichterloser Lautsprecher
US2806547A (en) * 1954-01-11 1957-09-17 Robert L Sewell Enclosures for sound reproduction
FR1143609A (fr) * 1954-07-21 1957-10-03 Perfectionnement aux électrophones
US3165587A (en) * 1962-10-08 1965-01-12 Richard L Alderson Multiple-loudspeaker system
DE2307146A1 (de) * 1973-02-14 1974-08-22 Ernst Rauhut Lautsprechergehaeuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE561608C (de) * 1929-08-31 1932-10-15 Lorenz Akt Ges C Elektrischer trichterloser Lautsprecher
US2806547A (en) * 1954-01-11 1957-09-17 Robert L Sewell Enclosures for sound reproduction
FR1143609A (fr) * 1954-07-21 1957-10-03 Perfectionnement aux électrophones
US3165587A (en) * 1962-10-08 1965-01-12 Richard L Alderson Multiple-loudspeaker system
DE2307146A1 (de) * 1973-02-14 1974-08-22 Ernst Rauhut Lautsprechergehaeuse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Wireless World, Band 78, No. 1439, Mai 1972 Sussex (GB) A.R. BAILEY: "The Transmission-Line Loudspeaker Enclosure" seiten 215-217 * seite 216, mittlere spalte, zeilen 3-26; figuren 6,7 * *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893695A (en) * 1987-06-16 1990-01-16 Matsushita Electric Industrial Co., Ltd. Speaker system
AU597496B2 (en) * 1987-06-16 1990-05-31 Matsushita Electric Industrial Co., Ltd. Speaker system
US5169104A (en) * 1991-10-02 1992-12-08 Kwoh Frederick Y S Speaker stand

Also Published As

Publication number Publication date
DK104781A (da) 1981-09-29
JPS56149895A (en) 1981-11-19

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

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19820322

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19821028

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TOBLER, HANSPETER