EP1016317A2 - Broadband loudspeaker - Google Patents
Broadband loudspeakerInfo
- Publication number
- EP1016317A2 EP1016317A2 EP98919104A EP98919104A EP1016317A2 EP 1016317 A2 EP1016317 A2 EP 1016317A2 EP 98919104 A EP98919104 A EP 98919104A EP 98919104 A EP98919104 A EP 98919104A EP 1016317 A2 EP1016317 A2 EP 1016317A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- loudspeaker
- loudspeaker according
- housing
- membrane
- zone
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
Definitions
- the invention relates to an approximately point-emitting broadband loudspeaker with improved playback properties according to claims 1 and 8.
- the idea of the invention is based on the ideal of the smallest possible spherical point source.
- housings have a great influence on the acoustic properties of a loudspeaker, whereby each housing shape and texture as well as the arrangement of the sound transducer in the housing have very characteristic effects on the reproduction quality.
- the playback errors caused by the case are then difficult to correct even digitally, even digitally, and are primarily attributable to the following causes:
- the sound waves are diffracted in the area of the diffraction frequency and below on the outer edges of the speaker, which leads to an irregular drop in amplitude in the case of unfavorable housing shapes.
- Cylinder shafts are formed on straight edges of the housing, which overlap (interfere) with the direct sound depending on the hearing angle.
- Coaxial speakers are known as a cone / dome and cone / horn combination. In both versions, the sound outlet for the high frequency range is located in the cone mouth.
- the membrane which already modulates the tweeter component assigned to it, is still exposed to the sound waves of the tweeter system - more with the dome, a little less with the horn. It is also disadvantageous that the sound components of the otherwise wide-angle dome are bundled in a frequency-dependent manner by the cone. The multiple reflections on the inner walls of the horny body interfere with the horn in various ways.
- the coaxial design of a tweeter / midrange dome loudspeaker from GB 2250658 provides a sensible approach, but does not make any statements regarding the suppression of partial vibrations.
- the dome-shaped loudspeaker front offers the advantage that the sound pressure parts do not break abruptly on the outer edges of the housing, but gradually. As a result, there are no interferences or irregularities in the amplitude frequency curve.
- the transition area between the conditions on an infinite baffle and those at the end of a long tube runs regularly here.
- the ⁇ xi ⁇ l emitted sound waves are guided directly, and the radially emitted sound components are guided into the rear area of the housing through the cone-shaped deflection surfaces. There they meet the deflection plane, which is preferably at a 45 ° angle, which can be formed by the rear wall of the housing and deflects the sound waves in such a way that they are often reflected on the inner walls of the housing shell, which preferably has a polygonal cross section.
- a damping material introduced into the housing cavity must be penetrated several times. Axial standing waves cannot develop.
- radial standing waves are distributed over several frequencies - depending on the number of segments - and thus already significantly weakened before they are also eliminated by the damping material.
- the extremely stable housing construction is very resonant and allows you to save the usual speaker cage and to fix the membrane suspension and the drive unit directly in the housing, e.g. if Aluminum or plastic are used as materials.
- the diaphragm In order to improve the bundling behavior of the loudspeaker diaphragm, i.e. to increase the beam angle, the diaphragm is designed as a dome. In connection with a dome-shaped loudspeaker front, an almost perfect abstraction behavior is achieved in the described transition area.
- Partial vibrations of the membrane are significantly suppressed if the spherical membrane is divided into stabilizing segments by providing it with a polygonal cross section. If an asymmetrical division is selected for this purpose, the vibration fields, which occur primarily opposite one another, cannot build up. Forming the edge area inwards to form a circular flange gives additional shape stability and creates a level for fastening the membrane suspension.
- the structure of the membrane in two zones and the elastic connection of the zones to each other - this can be a defined permanently elastic displacement - on the one hand further improves the radiation behavior, ie minimizes the effects of bundling, on the other hand the efficiency for high frequencies.
- the drop in the amplitude frequency response caused by the elastic coupling can be corrected with a bandpass.
- a division into further ring zones is possible to a limited extent.
- the coil holder is attached in the center. Wobble movements of the membrane can be prevented with a centering axis supported at the end or double, which preferably consists of a light hollow body.
- the annoying (damping and reflecting) centering spider can be omitted.
- FM distortion can be reduced if the center zone is decoupled from the ring zone and provided with its own drive and membrane suspension.
- the drive of the center zone has space in front of the drive for the ring zone, the center zone also being provided by a complete sound transducer element, e.g. a neodymium dome, can be represented.
- the inner membrane suspension of the ring zone is attached to this drive or sound transducer, which at the same time ensures complete sealing to the housing.
- sufficient centering and zeroing are possible.
- a slight phase deviation can be countered electronically.
- the subsequent housing leads back to the first solution, but can e.g. be a spherical housing with a suitable inner contour.
- Figure 1 shows schematically the longitudinal section of the broadband loudspeaker, in which a sound transducer (2) with a cone-shaped membrane (4) is introduced into the dome-shaped front (6), which is attached by means of the membrane suspension (5) both in a basket or in the housing (1) can be.
- the drive unit (3) can also be connected to a basket or the housing (1) or the rear wall (9).
- the diagonally arranged deflection plane (9) can be formed by the rear wall.
- the conical inner contour directs radially emitted sound components into the rear area of the housing (1), whereby they are subject to the described eliminating process.
- Figure 2 shows the sound transducer directly attached to the housing with the drive unit (3) and membrane suspension (5) in a convex and concave (dashed) design.
- the centering axis (15) is supported at the end in the example, the bearing (16) not being described in more detail, e.g. but can also be an elastic bead.
- FIG. 3 shows the dome membrane (10) divided into the ring zone (12) and the center zone (13).
- the fastening of the zones to one another by means of an elastic connection (14) is shown schematically.
- the ring zone (12) must expediently undergo a deformation in the coupling area.
- FIG. 3a shows an enlarged section of this area.
- FIG. 4 shows an arrangement with a separately driven center zone (13, 19).
- the inner membrane suspension (17) connects the ring zone (13) to the second drive (19) or to the coil carrier (18).
- the center zone (13) is provided with its own membrane suspension and can be a completely separate sound transducer.
- Figure 5 shows a three-dimensional housing (1) without loudspeaker.
- the outer cross section is completely round, while the interior is triangular, as can be seen from the view into the housing and the recessed rear wall (9).
- FIG. 6 shows a three-dimensional illustration of FIG. 3.
- the view can also illustrate FIGS. 2 and 4. Ignoring the paragraph in the center, we see the version according to Figure 2, interpreting it as a membrane suspension Figure 4.
- the polygonal outer contour of the dome-shaped loudspeaker front (6) shows a practical combination of the possible solutions.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Saccharide Compounds (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19710967 | 1997-03-17 | ||
DE19710967A DE19710967C1 (en) | 1997-03-17 | 1997-03-17 | Full range speakers |
PCT/EP1998/001526 WO1998042160A2 (en) | 1997-03-17 | 1998-03-17 | Broadband loudspeaker |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1016317A2 true EP1016317A2 (en) | 2000-07-05 |
EP1016317B1 EP1016317B1 (en) | 2002-05-29 |
Family
ID=7823608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98919104A Expired - Lifetime EP1016317B1 (en) | 1997-03-17 | 1998-03-17 | Broadband loudspeaker |
Country Status (14)
Country | Link |
---|---|
US (1) | US6385324B1 (en) |
EP (1) | EP1016317B1 (en) |
JP (1) | JP2002509666A (en) |
AT (1) | ATE218266T1 (en) |
AU (1) | AU7207398A (en) |
CA (1) | CA2284678A1 (en) |
DE (2) | DE19710967C1 (en) |
IL (1) | IL131879A0 (en) |
IS (1) | IS5179A (en) |
NO (1) | NO994467L (en) |
NZ (1) | NZ337842A (en) |
PL (1) | PL335614A1 (en) |
TR (1) | TR199902284T2 (en) |
WO (1) | WO1998042160A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2465890A1 (en) | 2010-12-17 | 2012-06-20 | Bayer MaterialScience AG | Method for producing polyether carbonate polyols with primary hydroxyl end groups and polyurethane polymers prepared thereof |
WO2013092504A1 (en) | 2011-12-20 | 2013-06-27 | Bayer Materialscience Ag | Isocyanate-functional prepolymer for a biologically degradable fabric adhesive |
WO2013092501A1 (en) | 2011-12-20 | 2013-06-27 | Bayer Intellectual Property Gmbh | Hydroxy-aminopolymers and method for producing same |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7362775B1 (en) | 1996-07-02 | 2008-04-22 | Wistaria Trading, Inc. | Exchange mechanisms for digital information packages with bandwidth securitization, multichannel digital watermarks, and key management |
US5613004A (en) | 1995-06-07 | 1997-03-18 | The Dice Company | Steganographic method and device |
US7664263B2 (en) | 1998-03-24 | 2010-02-16 | Moskowitz Scott A | Method for combining transfer functions with predetermined key creation |
US6205249B1 (en) | 1998-04-02 | 2001-03-20 | Scott A. Moskowitz | Multiple transform utilization and applications for secure digital watermarking |
US7159116B2 (en) | 1999-12-07 | 2007-01-02 | Blue Spike, Inc. | Systems, methods and devices for trusted transactions |
US7346472B1 (en) | 2000-09-07 | 2008-03-18 | Blue Spike, Inc. | Method and device for monitoring and analyzing signals |
US7095874B2 (en) | 1996-07-02 | 2006-08-22 | Wistaria Trading, Inc. | Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data |
US7177429B2 (en) | 2000-12-07 | 2007-02-13 | Blue Spike, Inc. | System and methods for permitting open access to data objects and for securing data within the data objects |
US7457962B2 (en) | 1996-07-02 | 2008-11-25 | Wistaria Trading, Inc | Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data |
US5889868A (en) | 1996-07-02 | 1999-03-30 | The Dice Company | Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data |
US7730317B2 (en) | 1996-12-20 | 2010-06-01 | Wistaria Trading, Inc. | Linear predictive coding implementation of digital watermarks |
US7664264B2 (en) | 1999-03-24 | 2010-02-16 | Blue Spike, Inc. | Utilizing data reduction in steganographic and cryptographic systems |
US7475246B1 (en) | 1999-08-04 | 2009-01-06 | Blue Spike, Inc. | Secure personal content server |
GB2364847B (en) * | 2000-07-11 | 2004-10-13 | Kef Audio | Compound loudspeaker having a magnet system |
US7127615B2 (en) | 2000-09-20 | 2006-10-24 | Blue Spike, Inc. | Security based on subliminal and supraliminal channels for data objects |
US7287275B2 (en) | 2002-04-17 | 2007-10-23 | Moskowitz Scott A | Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth |
US7006648B2 (en) * | 2003-10-22 | 2006-02-28 | Chao-Lang Wang | Speaker cabinet with increased air circulation efficiency |
GB2427522B (en) * | 2005-06-22 | 2008-07-16 | Gp Acoustics | Compound Loudspeaker |
WO2008008034A1 (en) * | 2006-07-12 | 2008-01-17 | Sagren Anders | High frequency diaphragm and voice coil assembly |
GB2442260A (en) * | 2006-09-29 | 2008-04-02 | Martin Audio Ltd | Loudspeaker diaphragm conforms to surrounding acoustic surface |
US7604091B2 (en) * | 2007-06-13 | 2009-10-20 | Plantronics, Inc. | Asymmetric and continuously curved speaker driver enclosure to optimize audio fidelity |
WO2010019846A1 (en) | 2008-08-14 | 2010-02-18 | Harman International Industries, Incorporated | Phase plug and acoustic lens for direct radiating loudspeaker |
JP2010081441A (en) * | 2008-09-26 | 2010-04-08 | Bifristec Kk | Speaker instrument |
DE102009024709A1 (en) * | 2009-06-12 | 2010-12-16 | Klaus Reck | Tweeter, has dome-shaped spherical membrane comprising symmetrical cavity in center and driven by circular moving coil, where cavity is immovably fixed at membrane middle point that is fixed at trapezoidal mounting portion |
US8634586B2 (en) * | 2009-06-26 | 2014-01-21 | Polk Audio, Inc. | Ceiling-mounted loudspeaker enclosure |
JP2014039231A (en) * | 2012-08-13 | 2014-02-27 | Kohon-Sha Llc | Coaxial speaker |
US10244322B2 (en) * | 2016-10-11 | 2019-03-26 | YG Acoustics LLC | Space frame reinforced tweeter dome |
DE102017206004A1 (en) * | 2017-04-07 | 2018-10-11 | Bayerische Motoren Werke Aktiengesellschaft | motor vehicle |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7502568U (en) * | 1975-11-06 | Blaupunkt Werke Gmbh | Dynamic speaker | |
US2145963A (en) | 1937-05-08 | 1939-02-07 | Harry A Adams | Auxiliary sound reproducing apparatus |
NL72895C (en) * | 1943-01-16 | |||
DE2057905B1 (en) * | 1970-11-25 | 1972-05-25 | Romen Faser Kunststoff | Loudspeaker arrangement with tweeter and woofer diaphragm driven by a drive system |
SE358800B (en) * | 1972-02-29 | 1973-08-06 | Bostedt J | |
US4122911A (en) * | 1976-07-01 | 1978-10-31 | Acoustic Fiber Sound Systems, Inc. | Loudspeaker assembly |
US4063387A (en) * | 1976-12-27 | 1977-12-20 | Mitchell Thomas R | Hanging planter pot speaker enclosure |
US4300217A (en) * | 1980-07-30 | 1981-11-10 | Honeywell Inc. | Acoustic transducer housing |
JPS5750197A (en) * | 1980-09-11 | 1982-03-24 | Yuutopia Kiki Kk | Cabinet for speaker |
DE3241898A1 (en) | 1982-11-12 | 1984-07-19 | Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover | Electrodynamic transducer |
GB8402229D0 (en) * | 1984-01-27 | 1984-02-29 | Tannoy Ltd | Moving coil loudspeaker |
DE3611120A1 (en) | 1986-04-03 | 1987-10-08 | Hans Buerk | Loudspeaker system for uniform all-round radiation of higher sound frequency components |
US4881265A (en) * | 1988-09-13 | 1989-11-14 | Soundwave Fidelity Corporation | Apex loudspeaker |
US5105905A (en) * | 1990-05-07 | 1992-04-21 | Rice Winston C | Co-linear loudspeaker system |
GB2250658A (en) * | 1990-12-07 | 1992-06-10 | Canon Res Ct Europe Ltd | Loudspeaker |
JPH0970092A (en) * | 1995-09-01 | 1997-03-11 | Saalogic:Kk | Point sound source, non-oriented speaker system |
-
1997
- 1997-03-17 DE DE19710967A patent/DE19710967C1/en not_active Expired - Fee Related
-
1998
- 1998-03-17 IL IL13187998A patent/IL131879A0/en unknown
- 1998-03-17 DE DE59804255T patent/DE59804255D1/en not_active Expired - Fee Related
- 1998-03-17 PL PL98335614A patent/PL335614A1/en unknown
- 1998-03-17 AT AT98919104T patent/ATE218266T1/en not_active IP Right Cessation
- 1998-03-17 TR TR1999/02284T patent/TR199902284T2/en unknown
- 1998-03-17 AU AU72073/98A patent/AU7207398A/en not_active Abandoned
- 1998-03-17 CA CA002284678A patent/CA2284678A1/en not_active Abandoned
- 1998-03-17 WO PCT/EP1998/001526 patent/WO1998042160A2/en not_active Application Discontinuation
- 1998-03-17 EP EP98919104A patent/EP1016317B1/en not_active Expired - Lifetime
- 1998-03-17 NZ NZ337842A patent/NZ337842A/en unknown
- 1998-03-17 US US09/381,158 patent/US6385324B1/en not_active Expired - Fee Related
- 1998-03-17 JP JP54013498A patent/JP2002509666A/en active Pending
-
1999
- 1999-09-14 IS IS5179A patent/IS5179A/en unknown
- 1999-09-15 NO NO994467A patent/NO994467L/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9842160A2 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2465890A1 (en) | 2010-12-17 | 2012-06-20 | Bayer MaterialScience AG | Method for producing polyether carbonate polyols with primary hydroxyl end groups and polyurethane polymers prepared thereof |
WO2013092504A1 (en) | 2011-12-20 | 2013-06-27 | Bayer Materialscience Ag | Isocyanate-functional prepolymer for a biologically degradable fabric adhesive |
WO2013092501A1 (en) | 2011-12-20 | 2013-06-27 | Bayer Intellectual Property Gmbh | Hydroxy-aminopolymers and method for producing same |
Also Published As
Publication number | Publication date |
---|---|
US6385324B1 (en) | 2002-05-07 |
IL131879A0 (en) | 2001-03-19 |
WO1998042160A2 (en) | 1998-09-24 |
AU7207398A (en) | 1998-10-12 |
PL335614A1 (en) | 2000-05-08 |
IS5179A (en) | 1999-09-14 |
ATE218266T1 (en) | 2002-06-15 |
WO1998042160A3 (en) | 1998-12-17 |
JP2002509666A (en) | 2002-03-26 |
NO994467D0 (en) | 1999-09-15 |
DE59804255D1 (en) | 2002-07-04 |
NO994467L (en) | 1999-11-09 |
TR199902284T2 (en) | 1999-12-21 |
EP1016317B1 (en) | 2002-05-29 |
NZ337842A (en) | 2001-01-26 |
CA2284678A1 (en) | 1998-09-24 |
DE19710967C1 (en) | 1998-10-22 |
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