CH680966A5 - Bass response improving device for closed housing loudspeaker - Google Patents
Bass response improving device for closed housing loudspeaker Download PDFInfo
- Publication number
- CH680966A5 CH680966A5 CH118790A CH118790A CH680966A5 CH 680966 A5 CH680966 A5 CH 680966A5 CH 118790 A CH118790 A CH 118790A CH 118790 A CH118790 A CH 118790A CH 680966 A5 CH680966 A5 CH 680966A5
- Authority
- CH
- Switzerland
- Prior art keywords
- gas pressure
- controller
- housing
- membrane
- loudspeaker
- Prior art date
Links
- 230000005520 electrodynamics Effects 0.000 claims abstract description 6
- 239000012528 membrane Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims 1
- 230000007423 decrease Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001771 impaired 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
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)
Abstract
Description
1 1
CH 680 966 A5 CH 680 966 A5
2 2nd
Beschreibung description
Stand der Technik. State of the art.
Bei herkömmlichen Lautsprechersystemen mit akustisch geschlossenen Lautsprechergehäusen stellt sich das Problem, dass ein kleines Gehäusevolumen die Tieftonwiedergabe stark beeinträchtigt. Bei einem kleinen Gehäuse beeinträchtigen Gasdruckkräfte, die durch Veränderung des Innenvolumens entstehen, die Bewegung der schallabstrahlenden Lautsprechermembran. Die Veränderungen des Innenvolumens werden durch die Bewegungen der Membran verursacht. Die entstehenden Druckkräfte behindern die Auslenkung der Membran und erhöhen als Federkräfte die Resonanzfrequenz und die Güte des Systems. With conventional loudspeaker systems with acoustically closed loudspeaker housings, the problem arises that a small housing volume greatly impairs the bass reproduction. In the case of a small housing, gas pressure forces caused by changes in the internal volume affect the movement of the sound-emitting loudspeaker diaphragm. The changes in the internal volume are caused by the movements of the membrane. The resulting pressure forces hinder the deflection of the membrane and, as spring forces, increase the resonance frequency and the quality of the system.
Um eine gute Tieftonwiedergabe zu erzielen, werden daher entweder unhandlich grosse Gehäuse verwendet, oder es werden die elektrischen Signale, die die Lautsprecher treiben, korrigierend beeinflusse oder es werden die abstrahlenden Lautsprechermembranen direkt in korrigierende Regelkreise eingebunden. Die beiden letzteren Massnahmen verursachen selbst wiederum akustische Verfälschungen, insbesondere das Impulsverhalten wird beeinträchtigt. In order to achieve good low-frequency reproduction, unwieldy housings are either used, or the electrical signals that drive the loudspeakers are corrected, or the radiating loudspeaker membranes are directly integrated into corrective control loops. The latter two measures themselves cause acoustic falsifications, in particular impulse behavior is impaired.
Weiters sind Verfahren bekannt (Tiefenbrun; US-Pat. 4 008 374), die durch Einwirkung einer innenliegenden Lautsprechermembran eine wirkungs-mässige Vergrösserung des Innenvolumens des Gehäuses erzielen. Bei diesem Verfahren wird jedoch das Problem auf den innenliegenden Lautsprecher verlagert. Um gute Ergebnisse zu erzielen, sind wiederum grosse Volumina erforderlich. Ausserdem entstehen Verzerrungen durch Phasenunterschiede in den Bewegungen der beiden Lautsprechermembranen und durch Laufzeiten. Furthermore, methods are known (Tiefenbrun; US Pat. 4,008,374) which achieve an effective enlargement of the interior volume of the housing by the action of an internal speaker membrane. With this method, however, the problem is shifted to the internal speaker. Large volumes are required to achieve good results. In addition, distortions arise due to phase differences in the movements of the two loudspeaker diaphragms and due to transit times.
Die Erfindung gemäss den Ansprüchen ermöglicht eine weitgehend unbehinderte Tieftonwiedergabe bei Verwendung kleiner Gehäuse und grossflächiger Lautsprecher, wobei eine direkte Beeinflussung der abstrahlenden Lautsprecher oder der sie treibenden Signale nicht vorgenommen wird. The invention according to the claims enables largely unimpeded low-frequency reproduction when using small housings and large-area loudspeakers, the radiating loudspeakers or the signals driving them not being directly influenced.
Die gestellte Aufgabe wird durch die Vorrichtung gemäss Anspruch 1 gelöst. Die Vorrichtung zeichnet sich dadurch aus, dass die von den Auslenkungen der abstrahlenden Lautsprechermembran durch Änderungen des Innenvolumens verursachten Differenzen zwischen dem Gasdruck im Gehäuseinneren und dem zeitlich gemitteten Gasdruck im Aussenraum des Gehäuses durch die Wirkung eines Regelkreises stark verringert werden. The object is achieved by the device according to claim 1. The device is characterized in that the differences between the gas pressure inside the housing and the time-averaged gas pressure in the outside space of the housing caused by the deflections of the radiating loudspeaker membrane due to changes in the internal volume are greatly reduced by the action of a control circuit.
Unterschiede zwischen dem Innendruck und dem Aussendruck werden mittels Gasdrucksensoren er-fasst und durch die Wirkung einer Druckregelung vermindert. Diese Verminderung der Druckdifferenz erfolgt durch die Bewegungen einer an das Innenvolumen angrenzenden Membran eines innerhalb des Gehäuses angeordneten elektrodynamischen Wandlers, der als Glied eines Regelkreises arbeitet. Ein Regler verarbeitet das elektrische Signal, das die Druckunterschiede beschreibt. Mittels eines nachgeschalteten Leistungsverstärkers regt der Regler die Membran des innenliegenden elektrodynamischen Wandlers zu Bewegungen an, die die auftretenden Druckunterschiede stark verringern. Als Regler wird vorzugsweise ein PI-, ein PID- oder ein Zustandsregler verwendet. Der Zu-standsregler verarbeitet alle relevanten Druck-grössen, zusätzlich die Zustandsgrössen der innenliegenden Membran, wie Auslenkung, Geschwindigkeit und Beschleunigung. Differences between the internal pressure and the external pressure are recorded by means of gas pressure sensors and reduced by the effect of pressure regulation. This pressure difference is reduced by the movements of a membrane adjacent to the internal volume of an electrodynamic transducer arranged inside the housing, which works as a member of a control loop. A controller processes the electrical signal, which describes the pressure differences. Using a downstream power amplifier, the controller stimulates the membrane of the internal electrodynamic converter to make movements that greatly reduce the pressure differences that occur. A PI, a PID or a status controller is preferably used as the controller. The state controller processes all relevant pressure variables, in addition the state variables of the internal membrane, such as deflection, speed and acceleration.
Beschreibung der Zeichnung. Description of the drawing.
Die Figur zeigt die Vorrichtung gemäss Anspruch 1. Der Aussenlautsprecher LA wird direkt durch das Eingangssignal e(t) angetrieben. Der elektrodynamische Wandler TR ist in eine Regelschleife eingebunden, die weiters aus dem Drucksensor P, dem Subtrahierglied D, dem Regler R und dem Leistungsverstärker A besteht. Dem Subtrahierglied wird als Sollwert ein Signal zugeführt, das proportional dem zeitlichen Mittelwert des Aussendruckes ist. Die Zeitdauer der Mittelwertsbildung ist dabei gross im Vergleich zur längsten Signalperiode, z. B. 100 Sekunden. Am invertierenden Eingang des Subtrahiergliedes wird das dem Gasdruck im Innenraum V1 proportionale Ausgangssignal des Sensors P angelegt. Der Regler ist so bemessen, dass die Regelabweichung, und somit die Druckdifferenz, möglichst klein gehalten wird. The figure shows the device according to claim 1. The external loudspeaker LA is driven directly by the input signal e (t). The electrodynamic converter TR is integrated in a control loop, which further consists of the pressure sensor P, the subtractor D, the controller R and the power amplifier A. A signal is supplied to the subtractor as a setpoint, which signal is proportional to the time average of the external pressure. The duration of the averaging is long compared to the longest signal period, e.g. B. 100 seconds. The output signal of the sensor P, which is proportional to the gas pressure in the interior V1, is applied to the inverting input of the subtractor. The controller is dimensioned in such a way that the control deviation, and thus the pressure difference, is kept as small as possible.
Claims (2)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH118790A CH680966A5 (en) | 1990-04-09 | 1990-04-09 | Bass response improving device for closed housing loudspeaker |
PCT/CH1991/000060 WO1991015933A1 (en) | 1990-04-09 | 1991-03-15 | Device for improving bass reproduction in loudspeaker systems with closed housings |
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 |
DE59108406T DE59108406D1 (en) | 1990-04-09 | 1991-03-15 | DEVICE FOR IMPROVING THE BASS REPLACEMENT IN SPEAKER SYSTEMS WITH CLOSED HOUSINGS |
AT91905477T ATE146328T1 (en) | 1990-04-09 | 1991-03-15 | DEVICE FOR IMPROVING BASS REPRODUCTION IN SPEAKER SYSTEMS WITH CLOSED ENCLOSURES |
EP91905477A EP0476082B1 (en) | 1990-04-09 | 1991-03-15 | Device for improving bass reproduction in loudspeaker systems with closed housings |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH118790A CH680966A5 (en) | 1990-04-09 | 1990-04-09 | Bass response improving device for closed housing loudspeaker |
Publications (1)
Publication Number | Publication Date |
---|---|
CH680966A5 true CH680966A5 (en) | 1992-12-15 |
Family
ID=4204540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH118790A CH680966A5 (en) | 1990-04-09 | 1990-04-09 | Bass response improving device for closed housing loudspeaker |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH680966A5 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2050304B1 (en) * | 2006-08-10 | 2018-10-24 | Claudio Lastrucci | Improvements to systems for acoustic diffusion |
-
1990
- 1990-04-09 CH CH118790A patent/CH680966A5/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2050304B1 (en) * | 2006-08-10 | 2018-10-24 | Claudio Lastrucci | Improvements to systems for acoustic diffusion |
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