EP0476082A1 - Vorrichtung zur verbesserung der basswiedergabe bei lautsprechersystemen mit geschlossenen gehäusen. - Google Patents
Vorrichtung zur verbesserung der basswiedergabe bei lautsprechersystemen mit geschlossenen gehäusen.Info
- Publication number
- EP0476082A1 EP0476082A1 EP91905477A EP91905477A EP0476082A1 EP 0476082 A1 EP0476082 A1 EP 0476082A1 EP 91905477 A EP91905477 A EP 91905477A EP 91905477 A EP91905477 A EP 91905477A EP 0476082 A1 EP0476082 A1 EP 0476082A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- volume
- gas pressure
- loudspeaker
- housing
- membrane
- 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
- 230000005520 electrodynamics Effects 0.000 claims abstract description 24
- 239000012528 membrane Substances 0.000 claims description 37
- 238000005192 partition Methods 0.000 claims description 16
- 230000000694 effects Effects 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 2
- 230000036461 convulsion Effects 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 230000007423 decrease Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
-
- 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
- H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
- H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for loudspeaker transducers
Definitions
- the invention relates to a loudspeaker system for reproducing low-frequency acoustic tones, which works with a closed housing of small volume.
- the invention according to the claims enables largely unobstructed low-frequency radiation when using small loudspeaker housings and large-area loudspeakers in low-frequency loudspeaker systems, a direct, actively corrective influence on the signals driving the radiating loudspeakers not having to be carried out.
- the devices are characterized in that the pressure differences between the gas pressure inside the housing and the time-averaged gas pressure outside of the housing caused by the deflections of the radiating loudspeaker membrane due to changes in volume of the inner volume are greatly reduced by the action of a control circuit.
- FIG. 1 shows a simple device according to the invention.
- the outdoor speaker LA is driven directly by the input signal e (t).
- the electrodynamic converter TR is integrated in a control loop, which consists of the pressure sensor P, the sub-emitter D, the controller R, the power amplifier A and consists of the electrodynamic converter TR.
- the time-averaged size of the gas pressure that prevails outside the housing G is supplied to the sub-radiator as a setpoint.
- the duration of the averaging is long compared to the longest signal periods, eg 100 seconds.
- the output signal of the sensor P which is proportional to the gas pressure in VI, is applied to the inverting input of the sub-radiation element.
- the regulator R is dimensioned in such a way that the control deviation, and thus the pressure difference, is kept as small as possible. In the simplest case, a proportional element with appropriate amplification is used as controller R.
- the invention according to claims 2 and 3 ensures a simple and unproblematic usability of the method, which greatly weakens the effects of a finally large internal volume on the reproduction of low frequencies by using a pressure control.
- control largely unaffected by the actual housing dimensions.
- This enables the manufacture of an easy-to-use product that can also be used and used by less technically educated people.
- the aim is to make it easy to use a control that works largely independently of the housing dimensions in the desired manner (compensation of pressure differences, no oscillation due to dead times or running times in the internal volume, no distortion due to transient processes, etc.), and also acoustic , higher-frequency useful signal components is not excited.
- the solution is achieved on the one hand by the controlled system, i.e. the gas volume, on which the membrane of the interior acts electrodynamic converter, when rapid pressure changes occur, has effectively constant and suitably defined properties.
- the controlled system i.e. the gas volume, on which the membrane of the interior acts electrodynamic converter, when rapid pressure changes occur, has effectively constant and suitably defined properties.
- the controlled system is not influenced by higher-frequency interference, that is, the higher-frequency components of the acoustic signal generated by the radiating loudspeaker.
- both goals are achieved by selecting an appropriately small partial volume V2 of the interior volume of the loudspeaker housing as the controlled system.
- This small partial volume is delimited by means of a sound-insulating wall T1 against the remaining inner volume VI, which adjoins the membrane of the loudspeaker LA which emits sound into the outside space.
- Another, third internal volume V3 is constructed as an approximately gas-tight chamber, which is separated from the former, small internal volume V2 by a sound-insulating wall T2 and the membrane M of the internal electrodynamic converter TR.
- the sound-insulating wall T1 is provided with openings D, via which the middle partial volume V2 is connected to the volume VI.
- the breakthroughs are designed and filled with sound-absorbing fibers or foams such that sound and pressure are transmitted from the middle sub-volume V2 into the volume VI and also in the opposite direction in time according to a transfer function with low-pass characteristics.
- the gas pressure is measured by a gas pressure sensor P arranged there and, in cooperation with an electronic controller R and an electrical power amplifier A and through the action of the membrane M of the electrodynamic converter TR on this partial volume V2, the instantaneous pressure differences between the gas pressure in V2 and the mean outside pressure kept negligible.
- the third, gas-tight chamber V3 prevents the back of the membrane M of the transducer from acting on the remaining volumes VI, V2 or on the external volume. Since the low-pass filter transmits slow pressure changes almost unaffected, slow pressure changes relative to the mean external pressure also become approximately in the internal volume VI suppressed. However, rapid pressure changes caused by the internal electrodynamic converter only work in the precisely defined small partial volume V2. Dead times and the associated tendency to oscillate in the control loop can be easily mastered. In addition, transients in the control circuit are kept away from the external loudspeaker, and higher-frequency sound components generated by the radiating external loudspeaker are kept away from the control circuit (pre-filter effect).
- the device enables largely unimpeded radiation of low sound frequencies by the external loudspeaker LA by largely eliminating the compression forces which hinder movement of the loudspeaker membrane and arise in the interior of the housing.
- the device according to the characteristics of claim 3 fulfills the task of easy and problem-free application of the pressure control in loudspeaker housings. It is a mechanical unit that, like a loudspeaker chassis, can be easily bought in specialist shops and can then be easily installed in any closed housing. The control loop is already optimally adjusted, no further adjustment is necessary.
- the characteristics of claim 4 describe a suitable electrodynamic converter.
- this converter is constructed like a bass loudspeaker, i.e. with a basket, membrane suspension, membrane, voice coil, magnet, magnetic circuit and air gap.
- the special features concern the area of the membrane and the possible membrane stroke: The area of the membrane is relatively small, the possible membrane stroke is large. Both of these requirements result from the fact that the converter has to compress or decompress a small gas volume, V2 in Figure 1 or V3 in Figure 2, and must apply the appropriate forces.
- the device aims to directly measure the difference between the internal gas pressure to be regulated and the time average of the gas pressure outside the loudspeaker housing.
- the gas volume inside the measuring chamber is connected via a very small opening to the volvunen that timed the chamber.
- a pressure equalization takes place through this opening, the time constant of which is large in comparison with the periods of the acoustic pressure fluctuations.
- the deflections of the membrane and thus the signal generated are proportional to the pressure difference.
- the signal can be fed to the controller without the interposition of a sub-radiator.
- a first-order high-pass filter with a very low corner frequency is inserted into the signal path.
- Figures 1, 2 and 3 show devices according to claims 1, 2 and 3.
- Fig. 1 The internal volume of the loudspeaker cabinet G is divided into 2 volumes VI, V2 by a gas-tight partition T.
- the external loudspeaker LA drives the input signal e (t) directly.
- the internal electrodynamic converter TR is integrated in a control loop, which consists of the pressure sensor P, the sub-radiator D, the controller R, the power amplifier A and the electrodynamic converter TR.
- the time-averaged size of the gas pressure that prevails outside the housing G is supplied to the sub-radiator as a setpoint.
- a inverting input of the sub-radiator is the Gas pressure in VI proportional output signal of sensor P applied.
- Figure 2 There are a cross section of the loudspeaker housing G, the outer loudspeaker LA, the inner electrodynamic converter TR with its membrane M, the first partition Tl with an opening D, the second partition T2, the first volume VI, the mean volume V2, the last volume V3, the pressure sensor P, the controller R and the amplifier A shown.
- FIG. 3 The sectional view shows the housing G with an opening D, the circumferential fold F, the partition T, the electrodynamic converter TR with its membrane M, the one volume VI, the other volume V2, the pressure sensor P, the regulator R and amplifier A shown.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Circuit For Audible Band Transducer (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH118790A CH680966A5 (en) | 1990-04-09 | 1990-04-09 | Bass response improving device for closed housing loudspeaker |
CH1187/90 | 1990-04-09 | ||
CH1991A CH681843A5 (en) | 1991-01-07 | 1991-01-07 | Bass response improving device for closed housing loudspeaker |
CH19/91 | 1991-01-07 | ||
PCT/CH1991/000060 WO1991015933A1 (de) | 1990-04-09 | 1991-03-15 | Vorrichtung zur verbesserung der basswiedergabe bei lautsprechersystemen mit geschlossenen gehäusen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0476082A1 true EP0476082A1 (de) | 1992-03-25 |
EP0476082B1 EP0476082B1 (de) | 1996-12-11 |
Family
ID=25683270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91905477A Expired - Lifetime EP0476082B1 (de) | 1990-04-09 | 1991-03-15 | Vorrichtung zur verbesserung der basswiedergabe bei lautsprechersystemen mit geschlossenen gehäusen |
Country Status (6)
Country | Link |
---|---|
US (1) | US5461676A (de) |
EP (1) | EP0476082B1 (de) |
AT (1) | ATE146328T1 (de) |
CA (1) | CA2060661C (de) |
DE (1) | DE59108406D1 (de) |
WO (1) | WO1991015933A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011084567C5 (de) * | 2011-10-14 | 2019-08-14 | Eberspächer Exhaust Technology GmbH & Co. KG | Aktiver Schalldämpfer |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH684043A5 (de) * | 1991-10-05 | 1994-06-30 | Maximilian Hobelsberger | Vorrichtung zur Verbesserung der Basswiedergabe bei Lautsprechersystemen mit geschlossenen Gehäusen. |
GB2264208B (en) * | 1992-02-15 | 1996-05-22 | Maximilian Hans Hobelsberger | A loudspeaker system |
US5812686A (en) * | 1992-03-24 | 1998-09-22 | Hobelsberger; Maximilian Hans | Device for active simultation of an acoustical impedance |
CH685657A5 (de) * | 1992-03-24 | 1995-08-31 | Maximilian Hobelsberger | Vorrichtung zur aktiven Simulation einer akustischen Impedanz. |
GB9313285D0 (en) * | 1993-06-28 | 1993-08-11 | Zeneca Ltd | Acid derivatives |
GB2297880B (en) * | 1995-01-26 | 1999-04-07 | John Ronald Watkinson | Loudspeaker |
US5647012A (en) * | 1996-06-10 | 1997-07-08 | Han; Sang Wu | Tri-chamber speaker box |
US6353670B1 (en) * | 1996-07-02 | 2002-03-05 | Donald R. Gasner | Actively control sound transducer |
US6408078B1 (en) * | 1997-10-30 | 2002-06-18 | Maximilian Hobelsberger | Active reactive acoustical elements |
US6088459A (en) * | 1997-10-30 | 2000-07-11 | Hobelsberger; Maximilian Hans | Loudspeaker system with simulated baffle for improved base reproduction |
US6584204B1 (en) * | 1997-12-11 | 2003-06-24 | The Regents Of The University Of California | Loudspeaker system with feedback control for improved bandwidth and distortion reduction |
US7113607B1 (en) * | 1998-09-03 | 2006-09-26 | Mullins Joe H | Low frequency feedback controlled audio system |
CA2440926C (en) * | 2002-09-20 | 2012-10-30 | Isao Kakuhari | Noise control apparatus |
US7068806B2 (en) * | 2003-01-14 | 2006-06-27 | Walsh Casey P | Condensed speaker system |
JP4141853B2 (ja) * | 2003-01-30 | 2008-08-27 | 三菱電機株式会社 | スピーカ |
ITMI20041972A1 (it) * | 2004-10-18 | 2005-01-18 | Daniele Ramenzoni | Dispositivo elettroacustico, con risonatore a cavita', che fornisce caratteristiche tridimensionali estreme per controllare, concentrare e diffondere infrasuoni, suoni e ultrasuoni. |
US20080031472A1 (en) * | 2006-08-04 | 2008-02-07 | Freeman Eric J | Electroacoustical transducing |
US8428278B2 (en) * | 2006-08-10 | 2013-04-23 | Claudio Lastrucci | Improvements to systems for acoustic diffusion |
KR100956552B1 (ko) * | 2008-02-27 | 2010-05-07 | 박승민 | 비주얼 스피커의 oled 및 콘페이퍼 유동 제어장치 |
EP2425640B1 (de) * | 2009-05-01 | 2018-08-15 | Bose Corporation | Mehrelementige elektroakustische wandlung |
US9351068B2 (en) * | 2013-06-14 | 2016-05-24 | Blackberry Limited | Obstructed port audio signal alteration |
US9432756B2 (en) | 2014-01-03 | 2016-08-30 | Blackberry Limited | Feedback enclosure and feedback system for a transducer of an electronic device |
JP5781194B2 (ja) * | 2014-05-15 | 2015-09-16 | 株式会社オーディオテクニカ | マイクロホン |
US9681228B2 (en) | 2014-09-30 | 2017-06-13 | Apple Inc. | Capacitive position sensing for transducers |
US20210105556A1 (en) * | 2019-10-08 | 2021-04-08 | Soniphi Llc | Systems & Methods For Expanding Sensation Using Isobaric Chambers |
US11172288B1 (en) * | 2020-07-14 | 2021-11-09 | Acoustic Metamaterials LLC | Methods and systems for modifying acoustics of a loudspeaker back enclosure using active noise control |
US11721314B2 (en) * | 2020-07-14 | 2023-08-08 | Acoustic Metamaterials LLC | Methods and systems for modifying acoustics of a loudspeaker back enclosure using active noise control |
JP6898538B1 (ja) * | 2021-03-09 | 2021-07-07 | 足立 静雄 | スピーカーシステム |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3867996A (en) * | 1973-11-21 | 1975-02-25 | Modular Sound Systems Inc | Speaker enclosure |
GB1500711A (en) * | 1974-01-26 | 1978-02-08 | Tiefenbrun I | Loudspeaker systems |
DE2637414C3 (de) * | 1976-08-19 | 1979-06-13 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | AmplitudenmeBvorrichtung für die Servo-Regelung eines Lautsprechers |
FR2405608A1 (fr) * | 1977-10-04 | 1979-05-04 | Milot Gilles | Perfectionnements aux enceintes acoustiques |
GB2122051A (en) * | 1982-06-01 | 1984-01-04 | Goodmans Loudspeakers Limited | Loudspeaker systems |
-
1991
- 1991-03-15 AT AT91905477T patent/ATE146328T1/de not_active IP Right Cessation
- 1991-03-15 EP EP91905477A patent/EP0476082B1/de not_active Expired - Lifetime
- 1991-03-15 CA CA002060661A patent/CA2060661C/en not_active Expired - Fee Related
- 1991-03-15 WO PCT/CH1991/000060 patent/WO1991015933A1/de active IP Right Grant
- 1991-03-15 DE DE59108406T patent/DE59108406D1/de not_active Expired - Fee Related
- 1991-03-15 US US07/776,426 patent/US5461676A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9115933A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011084567C5 (de) * | 2011-10-14 | 2019-08-14 | Eberspächer Exhaust Technology GmbH & Co. KG | Aktiver Schalldämpfer |
Also Published As
Publication number | Publication date |
---|---|
CA2060661C (en) | 1997-11-25 |
WO1991015933A1 (de) | 1991-10-17 |
CA2060661A1 (en) | 1991-10-10 |
US5461676A (en) | 1995-10-24 |
ATE146328T1 (de) | 1996-12-15 |
DE59108406D1 (de) | 1997-01-23 |
EP0476082B1 (de) | 1996-12-11 |
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