DE102008013627A1 - Directional loudspeaker, has contracting main membrane and resonating auxiliary membrane arranged in dipole housing, where main membrane produces ultrasonic pressure in housing inner area that is provided with rearward or lateral openings - Google Patents

Directional loudspeaker, has contracting main membrane and resonating auxiliary membrane arranged in dipole housing, where main membrane produces ultrasonic pressure in housing inner area that is provided with rearward or lateral openings Download PDF

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DE102008013627A1
DE102008013627A1 DE200810013627 DE102008013627A DE102008013627A1 DE 102008013627 A1 DE102008013627 A1 DE 102008013627A1 DE 200810013627 DE200810013627 DE 200810013627 DE 102008013627 A DE102008013627 A DE 102008013627A DE 102008013627 A1 DE102008013627 A1 DE 102008013627A1
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membrane
housing
dipole
auxiliary
main membrane
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DE102008013627B8 (en
DE102008013627B4 (en
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Helmut Barth
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Barth Acoustic Systems De GmbH
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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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The loudspeaker has a contracting main membrane (1) and a resonating auxiliary membrane (2) that are arranged in a dipole housing (4). The main membrane produces an ultrasonic pressure in a closed housing inner area (3) that is provided with rearward or lateral openings. The auxiliary membrane is moved based on an inner pressure for oscillating the main membrane, where physical characteristics of the auxiliary membrane control an overlapping of pressure and dipole radiation.

Description

Die Erfindung betrifft einen Richtlautsprecher.The The invention relates to a directional speaker.

Derartige Lautsprecher sind bekannt z. B. von der Firma, Siemens, Phillips, Steffens. Diese Lautsprecher funktionieren nach dem Prinzip der Schallabstrahlung durch einfache Öffnungen (Steffens, Siemens, Phillips) oder durch Kammern gesteuerte Phasenverschiebungen oder Schallverzögerungen der rückwärtig abgestrahlten Schallwellen Fa. ME-Geithain.such Speakers are known z. From the company, Siemens, Phillips, Steffens. These speakers work on the principle of sound radiation through simple openings (Steffens, Siemens, Phillips) or chamber-controlled phase shifts or sound delays the radiated backward Sound waves Fa. ME-Geithain.

Die einfachen Schallöffnungen (Siemes/Phillips/Steffens-Elektro-Akustik weisen den Nachteil auf, bei zunehmender Wellenlänge der Betriebsfrequenzen auch einen zunehmenden akustischen Kurzschluss und damit eine Verringerung des abstrahlbaren Schalldrucks aufzuweisen. Die Konstruktiornen von ME-Geithain sind aufgrund der Abmessungen in einem eingeschränkten langwelligeren Ton-Spektrum effektiv.The simple sound openings (Siemes / Phillips / Steffens electro-acoustics have the disadvantage, with increasing wavelength the operating frequencies also an increasing acoustic short circuit and thus to have a reduction in the sound pressure that can be emitted. The constructors of ME-Geithain are due to the dimensions in a restricted long-wave sound spectrum effectively.

Alle Verfahren haben zur Aufgabe 180° phasenverschobene Schallwellen im hinteren Bereich einer Lautsprecherbox mit den direkt abgestrahlten, frontseitigen und kugelförmig abgestrahlten Schallwellen einer Lautsprecherbox (Druckstrahler) zur Auslöschung zu bringen.All Procedures have the task 180 ° out of phase Sound waves in the rear of a speaker with the direct radiated, front and spherical radiated sound waves a loudspeaker box (pressure blaster) to extinguish.

Dies gelingt mehr oder weniger erfolgreich und selten über ein breites Tonspektrum. Vor allem Lautsprecher mit sehr kleinen Abmessungen (Steffens) sind uneffektiv bei tiefen Frequenzen. Bei tiefen Frequenezen arbeiten die Lautsprecher dann als offene Dipole, wodurch der Membranhub mit abnehmender Frequenz schnell unkontrollierbar wird (Strahlugnswiderstand nimmt ab). Große Gehäuselautsprecher (ME-Geithain) erzwingen lange Laufzeiten aufgund des großen Gehäuseumfangs und arbeiten daher ausschließlich im tieffrequenten Frequenzbereich wirkungsvoll.This succeed more or less successfully and seldom over one wide sound spectrum. Especially speakers with very small dimensions (Steffens) are ineffective at low frequencies. At low frequency the speakers then work as open dipoles, causing the diaphragm stroke becomes rapidly uncontrollable with decreasing frequency (Strahlugnswiderstand decreases). Size Cabinet Loudspeaker (ME-Geithain) enforce long terms due to the large housing circumference and work exclusively in the low-frequency frequency range effectively.

Aufgabe der vorliegenden Erfindung ist es, mit einfachen Mitteln die vorgenannten Nachteil zu vermeiden und den nutzbaren Frequenzbereich von Tiefen bis mittlere Frequenzen zu erweitern.task The present invention is, with simple means, the aforementioned Disadvantage to avoid and the usable frequency range of depths to expand to medium frequencies.

1 zeigt einen Richtlautsprecher, der eine schwindende Hauptmembran (1) und eine mitschwingende Hilfsmembran (2) besitzen. Beide Membranen (1) und (2) befinden sich in einem Dipolgehäuse (4). Die schwingende Hauptmembran (1) ist aktiv, d. h. angetrieben. Die Hauptmembran (1) erzeugt einerseits einen Schalldruck im geschlossenen Gehäuseinnenraum (3) sowohl einen identischen Schalldruck nach außen zur allen Seiten zur Folge hat. Die Hilfsmembran (2) wird aufgrund des Innendruckes mitbewegt und folgt der Schwingung der Hauptmembran (1). Die Membranen (1) und (2) erzeugen aufgrund ihrer gleichphasigen Schwingung als Schnelle einen Dipol (4) und gleichzeitig einen Druck nach außen. Die Richtwirkung kommt dadurch zustande, dass sich die Hilfsmembran (2) gleichphasig zur Hauptmembran (1) bewegt aber nur zu einem Teil der Bewegung der Hauptmembran folgt. Der im Gehäuseinneren erzeugte Schalldruck wird mit der gleichphasigen Schwingung der Hilfsmembran (2) überlagert und führt wie bei Richtmikrofonen zu einer Nieren- bis Supernieren-förmigen Richtwirkung. Die Abstrahlung erfogt hauptsächlich nach vorn (6). 1 shows a directional speaker having a dwindling main membrane ( 1 ) and a resonant auxiliary membrane ( 2 ). Both membranes ( 1 ) and ( 2 ) are in a dipole housing ( 4 ). The vibrating main membrane ( 1 ) is active, ie powered. The main membrane ( 1 ) generates on the one hand a sound pressure in the closed housing interior ( 3 ) both results in an identical sound pressure to the outside to all sides. The auxiliary membrane ( 2 ) is moved due to the internal pressure and follows the vibration of the main membrane ( 1 ). The membranes ( 1 ) and ( 2 ) generate a dipole due to their in-phase oscillation as fast ( 4 ) and at the same time a pressure to the outside. The directivity is due to the fact that the auxiliary membrane ( 2 ) in phase with the main membrane ( 1 ) but only part of the movement follows the main membrane. The sound pressure generated inside the housing is combined with the in-phase oscillation of the auxiliary membrane ( 2 ) superimposed and leads as in directional microphones to a kidney to supercardioid directional effect. The radiation is mostly forward ( 6 ).

Die Hilfsmembran (2) besteht aus einem Material mit starker innerer Dämpfung und geringer Masse, um kein Feder-Masse-System im vorgesehenen Frequenzbereich zu bilden.The auxiliary membrane ( 2 ) consists of a material with strong internal damping and low mass, so as not to form a spring-mass system in the intended frequency range.

Die Auslegung der Hilfsmembran (2) und durch dessen akustischer Widerstand wird die Richtwirkung in weiten Frequenzbereichen gesteuert.The design of the auxiliary membrane ( 2 ) and the acoustic resistance of the directivity is controlled in wide frequency ranges.

Claims (8)

Richtlautsprecher, umfassend wenigstens ein geschlossenes Gehäuse (3) mit rückwärtigen oder seitlichen Öffnungen (5) und innenliegender Hilfsmembran (2).Directional speaker, comprising at least one closed housing ( 3 ) with rear or side openings ( 5 ) and inner auxiliary membrane ( 2 ). Richtlautsprecher in Anspruch 2, dadurch gekennzeichnet, dass die mitschwingende Membran (2) innerhalb eines Dipols (4) angeordnet ist.Directional loudspeaker in claim 2, characterized in that the resonant membrane ( 2 ) within a dipole ( 4 ) is arranged. Richtlautsprecher in Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Membranen (1) und (2) einen geschossenen Druckstrahler (3) bilden.Directional loudspeaker in claim 1 or 2, characterized in that the membranes ( 1 ) and ( 2 ) a shot blast ( 3 ) form. Richtlautsprecher nach einem oder mehreren Ansprüchen, dadurch gekennzeichnet, dass die Hilfsmembran (2) durch starke innere Dämpfung eine Überlagerung aus Dipol und Drucksystem erzeugt.Directional loudspeaker according to one or more claims, characterized in that the auxiliary membrane ( 2 ) creates a superposition of dipole and pressure system due to strong internal damping. Richtlautsprecher nach einem oder mehreren Ansprüchen, dadurch gekennzeichnet, dass das Gehäuse beidseitig von den Membranen verschlossen ist und sowohl als Dipol, als auch als Druckgehäuse arbeitet.Directional speaker according to one or more claims, characterized characterized in that the housing closed on both sides by the membranes and as a dipole, as well as a pressure housing works. Richtlautsprecher nach einem oder mehreren Ansprüchen, dadurch gekennzeichnet, dass die physikalischen Eigenschaften der Hilfsmembran (2) eine Überlagerung von Druck- und Dipolabstrahlung steuern.Directional loudspeaker according to one or more claims, characterized in that the physical properties of the auxiliary membrane ( 2 ) control a superposition of pressure and dipole radiation. Richtlautsprecher nach einem oder mehreren Ansprüchen, dadurch gekennzeichnet, dass die Richtwirkung einstellbar ist durch die Eigenschaften der Hilfsmembran (2).Directional loudspeaker according to one or more claims, characterized in that the directivity is adjustable by the properties of the auxiliary membrane ( 2 ). Richtlautsprecher nach einem oder mehreren Ansprüchen, dadurch gekennzeichnet, dass der Verlauf des akustischen Widerstands der rückwärtigen Öffnung (5) einen inversen Verlauf zum akustischen Widerstands der Hilfsmembran (2) aufweist und den nutzbaren Frequenzbereich erweitert.Directional speaker after one or more Claims, characterized in that the course of the acoustic resistance of the rear opening ( 5 ) an inverse course to the acoustic resistance of the auxiliary membrane ( 2 ) and extends the usable frequency range.
DE102008013627.1A 2008-03-11 2008-03-11 speaker Active DE102008013627B8 (en)

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DE102008013627B8 DE102008013627B8 (en) 2015-06-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8428284B2 (en) 2009-03-20 2013-04-23 Meyer Sound Laboratories, Incorporated Loudspeaker with passive low frequency directional control
US11102570B2 (en) 2019-06-11 2021-08-24 Bose Corporation Auto-configurable bass loudspeaker
US11153680B2 (en) 2020-02-13 2021-10-19 Bose Corporation Stackable loudspeakers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5929393A (en) * 1996-07-12 1999-07-27 Jeter, Jr.; Charles W. Speaker cabinet with sounding board
US20060078144A1 (en) * 2004-10-07 2006-04-13 Stiles Enrique M Compound-driven augmented passive radiator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8428284B2 (en) 2009-03-20 2013-04-23 Meyer Sound Laboratories, Incorporated Loudspeaker with passive low frequency directional control
US11102570B2 (en) 2019-06-11 2021-08-24 Bose Corporation Auto-configurable bass loudspeaker
US11153680B2 (en) 2020-02-13 2021-10-19 Bose Corporation Stackable loudspeakers

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DE102008013627B4 (en) 2015-04-23

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