CH681843A5 - Bass response improving device for closed housing loudspeaker - Google Patents
Bass response improving device for closed housing loudspeaker Download PDFInfo
- Publication number
- CH681843A5 CH681843A5 CH1991A CH1991A CH681843A5 CH 681843 A5 CH681843 A5 CH 681843A5 CH 1991 A CH1991 A CH 1991A CH 1991 A CH1991 A CH 1991A CH 681843 A5 CH681843 A5 CH 681843A5
- Authority
- CH
- Switzerland
- Prior art keywords
- volume
- loudspeaker
- partition
- housing
- acoustically
- Prior art date
Links
- 238000005192 partition Methods 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 6
- 239000000126 substance Substances 0.000 claims 1
- 230000007423 decrease Effects 0.000 abstract 1
- 230000005520 electrodynamics Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The loudspeaker (LA) is in a fully enclosed cabinet (G) of interior volume (VI). A pressure control circuit decreases the differences between the gas presence in interior (VI) of the housing (G) and the time averaged mean gas pressure, outside the housing. In particular, the control circuit comprises a pressure sensor (P), control unit (R), power amplifier (A) and an electro dynamic transducer (TR).
Description
Vorrichtung zur Verbesserung der Tieftonwiedergabe bei einem mit einem geschlossenen Gehäuse arbeitenden Lautsprechersystem.
Stand der Technik.
Bei herkömmlichen Lautsprechersystemen mit akustisch geschlossenen Lautsprechergehäusen stellt sich immer das Problem, dass ein kleines Gehäusevolumen die Tieftonwiedergabe stark beeinträchtigt. Um eine gute Tieftonwiedergabe zu ermöglichen, werden daher entweder unhandlich grosse Gehäuse verwendet, oder es werden die die Lautsprecher treibenden Signale einer Frequenzgangkorrektur unterzogen, oder es werden die abstrahlenden Lautsprechermembranen in korrigierende Regelkreise eingebunden. Die beiden letzteren Massnahmen verursachen selbst wiederum akustische Störungen. Weiters sind Verfahren bekannt ( Tiefenbrun; US-Pat. 4 008 374), die durch Einwirkung einer innenliegenden Lautsprechermembran eine wirkungsmässige Volumensvergrösserung des Gehäuses bezwecken.
Darstellung der Erfindung.
Die Erfindung stellt eine Weiterentwicklung eines Verfahrens dar, wonach niederfrequente Änderungen des Gasdruckes in dem von der schallabstrahlenden Lautsprechermembran und von dem akustisch geschlossenem Lautsprechergehäuse eingeschlossenen Gasvolumen durch die Wirkung der Bewegungen einer an dieses Volumen angrenzenden Membran eines innerhalb des Gehäuses angeordneten Lautsprechers, der als Glied eines Regelkreises arbeitet, weitgehend verhindert werden. Dadurch wird das Auftreten von Druckkräften, die eine niederfrequente Schallabstrahlung beeinträchtigen würden, weitgehend vermieden.
Die Erfindung gemäss den Ansprüchen 1, 2 und 3 gewährleistet eine umfassende und einfache Anwendung eines Verfahrens, das durch den Einsatz einer Druckregelung auf eine wirkungsmässige Vergrösserung des Innenvolumens eines geschlossenen Lautsprechergehäuses abzielt. Insbesondere wird eine von den tatsächlichen Gehäuseabmessungen weitgehend unabhängige Anwendung der Druckregelung ermöglicht. Die Erfindung erlaubt die Schaffung eines einfach einzusetzenden Produktes, das auch von technisch weniger ausgebildeten Personen verwendet werden kann. Zusätzlich wird das Verhalten der Druckregelung verbessert, indem die Beeinflussung des Regelkreises durch hochfrequente Druckschwankungen verringert wird.
Die die geschilderten Aufgaben lösende Vorrichtung fusst auf folgender Erkenntnis:
Es soll der Einsatz einer Regelung ermöglicht werden, die weitgehend unabhängig von den Gehäuseabmessungen in der erwünschten Art und Weise arbeitet, die also nicht schwingt und keine Verzerrungen durch Einschwingvorgänge erzeugt. Ausserdem soll der Regelkreis durch höherfrequente akustische Signale nicht angeregt werden. Dies wird einerseits erreicht, indem die Regelstrecke, das ist das Gasvolumen, auf das die Membran des Innenlautsprechers einwirkt, beim Auftreten schneller Druckänderungen wirkungsmässig konstante und geeignet festgelegte Eigenschaften aufweist. Andererseits muss sichergestellt werden, dass die Regelstrecke durch höherfrequente Störungen nicht beeinflusst wird. Höherfrequente Störungen sind insbesondere die hochfrequenten Anteile des vom abstrahlenden Lautsprecher erzeugten akustischen Signales.
Beide Ziele werden erreicht, indem als Regelstrecke ein angemessen kleines Teilvolumen des lnnenvolumens des Lautsprechergehäuses gewählt wird. Dieses Teilvolumen wird mittels schallisolierender Wände gegen das restliche Innenvolumen des Lautsprechergehäuses abgegrenzt. Die schallisolierenden Wände sind mit Durchbrüchen versehen, über die das Teilvolumen mit dem Restvolumen verbunden ist. Die Durchbrüche sind derart gestaltet und so mit schalldämpfenden Faser- oder Schaumstoffen ausgefüllt, dass eine Schall- oder Druckübertragung von dem Teilvolumen in das Restvolumen und auch in umgekehrter Richtung gemäss einer Übertragungsfunktion mit Tiefpasscharakteristik erfolgt.
In diesem Teilvolumen wird durch einen dort angeordneten Gasdrucksensor der Gasdruck gemessen und, in Zusammenwirkung mit einem elektronischen Regler und einem elektrischen Leistungsverstärker und durch Einwirkung einer Lautsprechermembran auf dieses Gasvolumen, die Änderungen des Gasdruckes annähernd unterdrückt. Da das Tiefpassfilter langsame Druckänderungen fast unbeeinflusst überträgt, werden langsame Druckänderungen im gesamten Innenvolumen des Lautsprechergehäuses annähernd unterdrückt.
Die Erfindung ermöglicht eine weitgehend unbehinderte Abstrahlung niedriger Tonfrequenzen durch in ein geschlossenes Gehäuse eingebaute Lautsprecher dadurch, dass die eine Bewegung der Lautsprechermembran behindernden, im Gehäuseinneren entstehenden Kompressionskräfte weitgehend eliminiert werden.
Beschreibung der Zeichnungen.
Die Bilder 1 und 2 zeigen Vorrichtungen gemäss den Ansprüchen 1 und 2 .
Bild 1. Es werden im Schnittbild das Lautsprechergehäuse G, der äussere Lautsprecher LA, der innere Lautsprecher LI mit seiner Membran MI, die erste Trennwand T1, die zweite Trennwand T2, das erste Volumen V1, das mittlere Volumen V2 mit einem Durchbruch D, das letzte Volumen V3, der Drucksensor P, der Regler R und der Verstärker V gezeigt.
Bild 2. Es werden im Schnittbild das Gehäuse G mit einem Durchbruch D, der umlaufende Falz F, die Trennwand T, der Innenlautsprecher L mit seiner Membran M, das eine Volumen V1, das andere Volumen V2, der Drucksensor P, der Regler R und der Verstärker V gezeigt.
Device for improving the bass reproduction in a loudspeaker system working with a closed housing.
State of the art.
With conventional loudspeaker systems with acoustically closed loudspeaker housings, there is always the problem that a small housing volume has a strong impact on the bass reproduction. In order to enable good low-frequency reproduction, unwieldy housings are either used, or the signals driving the loudspeakers are subjected to a frequency response correction, or the radiating loudspeaker membranes are integrated into corrective control loops. The latter two measures themselves cause acoustic disturbances. Furthermore, methods are known (Tiefenbrun; US Pat. 4,008,374) which, by the action of an internal loudspeaker diaphragm, have the effect of increasing the volume of the housing effectively.
Presentation of the invention.
The invention represents a further development of a method according to which low-frequency changes in the gas pressure in the gas volume enclosed by the sound-emitting loudspeaker membrane and by the acoustically closed loudspeaker housing by the action of the movements of a membrane adjacent to this volume of a loudspeaker arranged within the housing, which is a member of one Loop works, largely prevented. This largely prevents the occurrence of pressure forces that would impair low-frequency sound radiation.
The invention according to claims 1, 2 and 3 ensures a comprehensive and simple application of a method which, through the use of a pressure control, aims at an effective increase in the internal volume of a closed loudspeaker housing. In particular, an application of the pressure control that is largely independent of the actual housing dimensions is made possible. The invention allows the creation of an easy-to-use product that can also be used by less technically trained people. In addition, the behavior of the pressure control is improved by reducing the influence on the control circuit by high-frequency pressure fluctuations.
The device performing the described tasks is based on the following finding:
The aim is to enable the use of a control system that operates largely independently of the housing dimensions in the desired manner, that is to say that it does not oscillate and does not produce any distortions caused by transient processes. In addition, the control loop should not be excited by higher-frequency acoustic signals. On the one hand, this is achieved in that the controlled system, that is the volume of gas on which the membrane of the interior loudspeaker acts, has effectively and suitably defined properties when rapid pressure changes occur. On the other hand, it must be ensured that the controlled system is not influenced by higher-frequency interference. High-frequency disturbances are in particular the high-frequency components of the acoustic signal generated by the radiating loudspeaker.
Both goals are achieved by selecting an appropriately small partial volume of the internal volume of the loudspeaker housing as the controlled system. This partial volume is delimited from the remaining internal volume of the loudspeaker housing by means of sound-insulating walls. The soundproof walls are provided with openings through which the partial volume is connected to the remaining volume. The breakthroughs are designed and filled with sound-absorbing fibers or foams such that sound or pressure is transmitted from the partial volume to the remaining volume and also in the opposite direction according to a transfer function with a low-pass characteristic.
In this partial volume, the gas pressure is measured by a gas pressure sensor arranged there and, in cooperation with an electronic controller and an electrical power amplifier and through the action of a loudspeaker membrane on this gas volume, the changes in the gas pressure are approximately suppressed. Since the low-pass filter transmits slow pressure changes almost unaffected, slow pressure changes in the entire interior volume of the loudspeaker housing are almost suppressed.
The invention enables largely unimpeded radiation of low sound frequencies by loudspeakers built into a closed housing by largely eliminating the compression forces which hinder movement of the loudspeaker membrane and arise in the interior of the housing.
Description of the drawings.
Figures 1 and 2 show devices according to claims 1 and 2.
Figure 1. In the sectional view, the loudspeaker housing G, the outer loudspeaker LA, the inner loudspeaker LI with its membrane MI, the first partition T1, the second partition T2, the first volume V1, the middle volume V2 with an opening D that last volume V3, the pressure sensor P, the controller R and the amplifier V shown.
Figure 2. The sectional view shows the housing G with an opening D, the circumferential fold F, the partition T, the interior loudspeaker L with its membrane M, the one volume V1, the other volume V2, the pressure sensor P, the regulator R and the amplifier V shown.
Claims (3)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1991A CH681843A5 (en) | 1991-01-07 | 1991-01-07 | Bass response improving device for closed housing loudspeaker |
US07/776,426 US5461676A (en) | 1990-04-09 | 1991-03-15 | Device for improving bass reproduction in loudspeaker system with closed housings |
CA002060661A CA2060661C (en) | 1990-04-09 | 1991-03-15 | Device for improving bass reproduction in loudspeaker systems with closed housing |
PCT/CH1991/000060 WO1991015933A1 (en) | 1990-04-09 | 1991-03-15 | Device for improving bass reproduction in loudspeaker systems with closed housings |
DE59108406T DE59108406D1 (en) | 1990-04-09 | 1991-03-15 | DEVICE FOR IMPROVING THE BASS REPLACEMENT IN SPEAKER SYSTEMS WITH CLOSED HOUSINGS |
EP91905477A EP0476082B1 (en) | 1990-04-09 | 1991-03-15 | Device for improving bass reproduction in loudspeaker systems with closed housings |
AT91905477T ATE146328T1 (en) | 1990-04-09 | 1991-03-15 | DEVICE FOR IMPROVING BASS REPRODUCTION IN SPEAKER SYSTEMS WITH CLOSED ENCLOSURES |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1991A CH681843A5 (en) | 1991-01-07 | 1991-01-07 | Bass response improving device for closed housing loudspeaker |
Publications (1)
Publication Number | Publication Date |
---|---|
CH681843A5 true CH681843A5 (en) | 1993-05-28 |
Family
ID=4177548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1991A CH681843A5 (en) | 1990-04-09 | 1991-01-07 | Bass response improving device for closed housing loudspeaker |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH681843A5 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007129774A2 (en) * | 2006-05-09 | 2007-11-15 | Atsushi Yamada | Acoustic transmission path, speaker system using the same and tube module for assembly kit of acoustic transmission path |
US20220103933A1 (en) * | 2019-10-08 | 2022-03-31 | Soniphi Llc | Systems & Methods For Expanding Sensation Using Headset With Isobaric Chambers |
-
1991
- 1991-01-07 CH CH1991A patent/CH681843A5/en not_active IP Right Cessation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007129774A2 (en) * | 2006-05-09 | 2007-11-15 | Atsushi Yamada | Acoustic transmission path, speaker system using the same and tube module for assembly kit of acoustic transmission path |
WO2007129774A3 (en) * | 2006-05-09 | 2008-01-10 | Atsushi Yamada | Acoustic transmission path, speaker system using the same and tube module for assembly kit of acoustic transmission path |
US20220103933A1 (en) * | 2019-10-08 | 2022-03-31 | Soniphi Llc | Systems & Methods For Expanding Sensation Using Headset With Isobaric Chambers |
US11683639B2 (en) * | 2019-10-08 | 2023-06-20 | Soniphi Llc | Systems and methods for expanding sensation using headset with isobaric chambers |
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