DE739326C - Flat speakers with a baffle that is as close as possible to a building or room wall - Google Patents

Flat speakers with a baffle that is as close as possible to a building or room wall

Info

Publication number
DE739326C
DE739326C DET47571D DET0047571D DE739326C DE 739326 C DE739326 C DE 739326C DE T47571 D DET47571 D DE T47571D DE T0047571 D DET0047571 D DE T0047571D DE 739326 C DE739326 C DE 739326C
Authority
DE
Germany
Prior art keywords
baffle
building
room wall
wall
flat
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
DET47571D
Other languages
German (de)
Inventor
Dr Heinrich Benecke
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.)
Telefunken AG
Original Assignee
Telefunken 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 Telefunken AG filed Critical Telefunken AG
Priority to DET47571D priority Critical patent/DE739326C/en
Application granted granted Critical
Publication of DE739326C publication Critical patent/DE739326C/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2892Mountings or supports for transducers
    • H04R1/2896Mountings or supports for transducers for loudspeaker transducers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/021Transducers or their casings adapted for mounting in or to a wall or ceiling

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Building Environments (AREA)

Description

Flachlautsprecher mit an einer Gebäude- oder Zimmerwand möglichst eng anliegender Schallwand Neuerdings sind Lautsprecher geringer Bautiefe (kleiner als 6 cm) bekanntgeworden, die insbesondere bei behelfsmäßigen Installationen in Hallen, Museen ,o. dgl. benutzt werden. Diese Lautsprecher heben sich kaum von den Wänden ab und `beeinträchtigen daher den ästhetischen Eindruck des Raumes, in dem .sie angeordnet sind, praktisch gar nicht, selbst wenn .solche Lautsprecher in größerer Zahl vorhänden sind.Flat speakers with on a building or room wall if possible close-fitting baffle Recently, loudspeakers with a smaller installation depth (smaller than 6 cm), which is particularly useful for makeshift installations in Halls, museums, etc. Like. Be used. These speakers hardly stand out from the crowd Walls and `therefore impair the aesthetic impression of the room in which .they are arranged, practically not at all, even if .such loudspeakers in larger Number are available.

Bei der Anbringung dieser Lautsprecher an den Wänden eines Raumes. haben sich jiedoch gewisse Nachteile infolge der reflektierenden Eigenschaften der Wände herausgestellt. Nähert man einen in eine Schallwand eingebauten Flachlautsprecher einer schallreflektierenden Wand (Mauer, Holzwand o. dgl. ), so - tritt eine Beeinflussung des Frequenzganges des Lautsprechers ein. Der Schalldruck eines frei aufgehängten, in eine Schallwand eingebauten Flachlautsprechers, der von 13o bis 8oo Hz annähernd konstant war, wurde bei Annäherung der Schallwand an die reflektierende Wand bis auf 2,5 cm Abstand unterhalb 40O Hz auf etwa dein vierten Teil. herabgesetzt. Über ¢0o Hzerhöhte sich der Schalldruck auf das Doppelte. Diese Herabsetzung der tiefen und Erhöhung der mittleren Lagen ist außerordentlich störend, .da das Ohr den Mangel an tiefen Tönen, der noch betont wird durch das Hervortreten edier mittleren Lagen, unangenehm empfindet.When installing these speakers on the walls of a room. However, certain disadvantages have been found due to the reflective properties of the walls. If a flat loudspeaker built into a baffle is approached to a sound-reflecting wall (wall, wooden wall or the like), the frequency response of the loudspeaker is influenced. The sound pressure of a freely suspended flat loudspeaker built into a baffle, which was almost constant from 130 to 8oo Hz, was about the fourth when the baffle approached the reflecting wall up to 2.5 cm below 40O Hz. degraded. Above ¢ 0o H, the sound pressure doubled. This lowering of the lower ranges and raising of the middle ranges is extremely disturbing, since the ear is uncomfortable with the lack of low tones, which is emphasized by the emergence of the middle ranges.

Es ist bereits bekannt, störende Eigen-.Schwingungen bei Lautsprechern dadurch zu dämpfen, daß man hinter die Membran Watteflocken .o. dgl. brachte, so daß eine Dämpfung zu großer Amplituden erzielt wurde. Ferner ist bekannt, in Räumen mit starkem Nachhall die Wände mit stark absorbierendem Werkstoff zu belegen, um dadurch die Nachhalleigenschaften des Raumes zu beeinflussen; bei Zimmerecklautspre,chern wird außerdem auch die Rückseite ,der Schallwand mit solchem Stoff belegt. Die Erfindung betrifft einen Flachlautsprecher mit an :einer Gebäude- oder Zimmerwand möglichst eng anliegender Schallwand und einer Bautiefe von etwa 6 cm und weniger, der dadurch ausgezeichnet ist, daß zwischen Schallwand und Gebäude- bzw. Zimmerwand schalldämpfende Stoffe, wie Schlakkenwolle, Watte o. d-1., vorgesehen sind.It is already known that disturbing natural vibrations in loudspeakers to dampen by placing cotton wool flakes behind the membrane .o. like. brought so that attenuation of amplitudes that were too large was achieved. It is also known in rooms to cover the walls with highly absorbent material with strong reverberation in order to thereby influencing the reverberation properties of the room; with room corner speakers The back of the baffle is also covered with such a material. the The invention relates to a flat loudspeaker with: a building or room wall A baffle that fits as closely as possible and a depth of about 6 cm and less, which is characterized by the fact that between the baffle and the building or room wall Sound-absorbing materials such as wool, wadding o. d-1., are provided.

Es kann auch die Schallwand kastenähnlich ausgebildet sein und der Zwischenraum zwischen Schallwand und reflektierender Wand durch einen Absorptionswerkstoff, wie Watte, Schlackenwolle o. dgl., ausgefüllt werden. Der Raum hinter der Membran selbst bleibt aber im Ge#gensatz zu den oben-erwähnten Membrandämpfungsanordnungen frei.The baffle can also be designed like a box and the Space between the baffle and the reflective wall through an absorption material, such as cotton wool, slag wool or the like., are filled. The space behind the membrane itself, however, remains in contrast to the above-mentioned membrane damping arrangements free.

Die Abbildung veranschaulicht ein Auisführungsbeispiel des Erfindungsgegenstandes. Der Flachlautsprecher i ist in eine Schallwand 2 .eingesetzt, die mittels der Abstützung 3 an der reflektierenden Wand 4 anliegt. Die Abstützung 3 kann aus einzelnen Stützen gebildet sein. Sie kann aber auch vollkommen geschlossen sein und die Schallwand gegen die reflektierende Wand so abstützen, daß ein kastenförmiges Gebilde entsteht. In den Raum 5 zwischen Schallwand 2 und reflektierende Wand 4. wird .der dämpfende Wcrkstoff (Watte, Schlackenwolle o. dgl.) gebracht. Wenn die abzustützenden Teile 3 als freie Stützen ausgebildet sind, muß das Dämpfungsmaterial durch Kleben oder durch Herumziehen eines Streifens aus starkem Papier, Textilstoffen, wie Gaze o. d71., vor dem Herausfallen gesichert werden.The figure illustrates an exemplary embodiment of the subject matter of the invention. The flat speaker i is inserted into a baffle 2, which by means of the support 3 rests against the reflective wall 4. The support 3 can consist of individual supports be educated. But it can also be completely closed and the baffle Support against the reflective wall in such a way that a box-shaped structure is created. In the space 5 between baffle 2 and reflective wall 4. the damping Material (wadding, slag wool or the like) brought. When the parts to be supported 3 are designed as free supports, the damping material must be glued or by pulling around a strip of strong paper, textile materials such as gauze or the like. d71., to be secured against falling out.

Claims (3)

PATENTANSPRÜCHE: i. Flachlautsprecher mit an einer Gebäude- oder Zimmerwand möglichst eng anliegender Schallwand und einer Bautiefe von etwa 6 cm und weniger, dadurch gekennzeichnet, daß zwischen Scballwand und Gebäude- bzw. Zimmerwand schalldämpfende Stoffe, wie Schlackenwolle. Watte o. dgl., vorgesehen sind. PATENT CLAIMS: i. Flat loudspeaker with a baffle that fits as closely as possible to a building or room wall and a depth of about 6 cm and less, characterized in that sound-absorbing substances, such as slag wool, between the scball wall and the building or room wall. Cotton wool or the like. Are provided. 2. Flachlautsprecher nach Anspruch i, dadurch gekennzeichnet, daß die Schallwand kastenartig ausgebildet ist. 2. Flat speaker according to claim i, characterized in that the baffle is box-like. 3. Flachlautsprecher nach, Anspruch i, dadurch gekennzeichnet, daß die Gebäude-bzw. Zimmerwand an den Stellen, an denen ihr die Schallwand gegenüberliegt. mit dämpfenden Stoffen belegt ist. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik sind im Erteilungsverfahren in Betracht gezogen worden: deutsche Patentschrift Nr. 568o88, Zeitschrift »Funkbastler« 1933, H.47, Seite 7.15/6, 1929, 11.27, S.425 bis 427; Zeitschrift >,Funkschau« 1936, Nr. 26, S. 205; v. Braunmühl und Weber, Akustik, Leipzig 1936, S.64; Olson und Messa, Applied Acoustics, Philadelphia 1934, S. 198: McLachlan, Loudspeakers, Oxford 1934, S.295 bis 297; Penden und McIlwain, Electr. Engineers Handbook, New York 1936, S. i 2/o8.3. Flat speaker according to claim i, characterized in that the building or. Room wall at the points where the baffle is opposite. is covered with dampening substances. To distinguish the subject of the application from the state of the art, the following were considered in the granting procedure: German patent specification No. 568o88, magazine "Funkbastler" 1933, issue 47, page 7.15 / 6, 1929, 11.27, pages 425 to 427; Zeitschrift>, Funkschau «1936, No. 26, p. 205; v. Braunmühl and Weber, Akustik, Leipzig 1936, p.64; Olson and Messa, Applied Acoustics, Philadelphia 1934, p. 198: McLachlan, Loudspeakers, Oxford 1934, pp. 295-297; Penden and McIlwain, Electr. Engineers Handbook, New York 1936, pp. I 2 / o8.
DET47571D 1936-10-08 1936-10-08 Flat speakers with a baffle that is as close as possible to a building or room wall Expired DE739326C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET47571D DE739326C (en) 1936-10-08 1936-10-08 Flat speakers with a baffle that is as close as possible to a building or room wall

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET47571D DE739326C (en) 1936-10-08 1936-10-08 Flat speakers with a baffle that is as close as possible to a building or room wall

Publications (1)

Publication Number Publication Date
DE739326C true DE739326C (en) 1943-09-20

Family

ID=7562654

Family Applications (1)

Application Number Title Priority Date Filing Date
DET47571D Expired DE739326C (en) 1936-10-08 1936-10-08 Flat speakers with a baffle that is as close as possible to a building or room wall

Country Status (1)

Country Link
DE (1) DE739326C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968492C (en) * 1949-06-05 1958-02-27 Siemens Ag Loudspeaker group arrangement consisting of several loudspeakers built in a row in a common slat-like baffle
DE968491C (en) * 1949-06-05 1958-02-27 Siemens Ag Loudspeaker group arrangement consisting of several loudspeakers built in a row in a common slat-like baffle
DE202015101134U1 (en) * 2015-03-06 2016-06-08 LEGIS GbR (vertretungsberechtigter Gesellschafter: Thomas C.O. Schmidt, 10707 Berlin) Acoustic unit with fleece

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE568088C (en) * 1929-04-17 1933-01-14 Georg Seibt A G Dr Funnelless large area loudspeaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE568088C (en) * 1929-04-17 1933-01-14 Georg Seibt A G Dr Funnelless large area loudspeaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968492C (en) * 1949-06-05 1958-02-27 Siemens Ag Loudspeaker group arrangement consisting of several loudspeakers built in a row in a common slat-like baffle
DE968491C (en) * 1949-06-05 1958-02-27 Siemens Ag Loudspeaker group arrangement consisting of several loudspeakers built in a row in a common slat-like baffle
DE202015101134U1 (en) * 2015-03-06 2016-06-08 LEGIS GbR (vertretungsberechtigter Gesellschafter: Thomas C.O. Schmidt, 10707 Berlin) Acoustic unit with fleece

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