EP2829079B1 - Method of operating a loudspeaker, loudspeaker and arrangement for noise compensation - Google Patents
Method of operating a loudspeaker, loudspeaker and arrangement for noise compensation Download PDFInfo
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- EP2829079B1 EP2829079B1 EP13710788.4A EP13710788A EP2829079B1 EP 2829079 B1 EP2829079 B1 EP 2829079B1 EP 13710788 A EP13710788 A EP 13710788A EP 2829079 B1 EP2829079 B1 EP 2829079B1
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- membrane
- ist
- loudspeaker
- actual
- acceleration
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
Definitions
- the invention relates to a method for operating a loudspeaker device having at least one loudspeaker, wherein at least one membrane actual state variable of a diaphragm of the loudspeaker is detected by a detection device.
- the invention further relates to a speaker device and a device for noise compensation.
- an electrodynamic loudspeaker with voice coil and membrane as sound source is well known.
- a speaker is used as part of stereos, for example, in the home, up to high-quality car fidelity systems in the automotive sector.
- Its essential feature is the conversion of a time-dependent drive signal, which is applied to it or its terminals, in a time-dependent sound level profile, ie in particular a pressure, density and rapid response, which is delivered to the environment of the speaker.
- the drive signal is usually applied to the voice coil of the loudspeaker, which is in operative connection with the membrane and this displaced according to the drive signal.
- the conversion of the drive signal is generally such that a phase shift between the drive signal and the generated sound level is not a constant, but is present as a function of the frequency. This has the consequence that the drive signal or its shape, if it is not a pure sinusoidal, not completely retained when it is converted into the sound history. Thus, it is usually not possible to follow the membrane of the speaker in real time a predetermined position, speed and / or acceleration. Rather, only the frequencies in a frequency space, but not the phase or phase shift, correctly reproduced. However, since human hearing can not distinguish phases, such speaker behavior is sufficient for many applications.
- DE 199 42 526 discloses a driving of a loudspeaker, wherein position and acceleration of a loudspeaker diaphragm are detected, from the detected diaphragm position, the membrane speed is derived and from these three sizes a signal is formed, which is applied to an additional voice coil of the loudspeaker.
- an input signal is provided to the loudspeaker device, which serves as an input variable for determining the control signal in addition to the membrane state.
- the drive signal is so far as the output size.
- the relationship between the membrane state or its MembranistShsuccn and the drive signal, for example, is linear. It can however, a non-linear relationship may also be provided.
- the membrane state may be Also, at least one actual pressure, for example, the Schallist réelle behind or in front of the diaphragm of the speaker, in particular at a certain distance to a rest position of the membrane. Both the actual pressure before and the actual pressure behind the membrane are preferably determined.
- the determination can be carried out by measuring by means of a measuring device or alternatively by calculating in a calculation model.
- the calculation model can have, for example, at least one of the membrane actual state variables as the input variable and the actual pressure as the output variable.
- a further development of the invention provides that the membrane stop position, the membrane actual velocity or the membrane histamine acceleration is used as the at least one detected membrane actual state variable.
- the membrane actual state variables of the membrane actual state is detected. For example, only one of the membrane actual state variables is detected or measured. However, at least two, in particular exactly two, of the membrane actual state variables are preferably detected by means of the detection device. These are in particular the membrane stop position and the membrane acceleration.
- a development of the invention provides that for detecting the Membranistposition a distance sensor, in particular an optical distance sensor, preferably a laser distance sensor, is used as a detection device.
- the distance sensor is arranged stationary so that it can detect its distance from the membrane with sufficient accuracy. From the distance detected by means of the distance sensor, the deflection of the membrane and thus the membrane position can be determined.
- a distance sensor is preferably the optical distance sensor used, because with this a contactless detection of the distance is possible.
- the optical distance sensor has a light source and a light sensor, wherein the light source is directed onto the membrane and the light sensor is arranged such that it detects the light of the light source reflected by the membrane.
- the optical distance sensor determines the distance, for example by means of a transit time measurement of the light emitted by the light source, by means of a determination of a phase position and / or by means of triangulation.
- the latter is particularly preferably the case when the optical distance sensor is present as a laser distance sensor (laser triangulation).
- the laser distance sensor according to its name has a laser emitter serving as a light source.
- a development of the invention provides that, for detecting the acceleration of the membrane, an acceleration sensor arranged on the diaphragm, in particular a piezoelectric sensor or a MEMS sensor is used.
- an acceleration sensor arranged on the diaphragm, in particular a piezoelectric sensor or a MEMS sensor is used.
- the acceleration sensor should be arranged directly on the membrane in such a way that it moves together with it according to the drive signal.
- any acceleration sensor can be used.
- a piezoelectric sensor or a MEMS sensor MEMS: micro-electromechanical system.
- MEMS micro-electromechanical system
- At least one further acceleration sensor may be provided on a basket of the loudspeaker or on an element fixedly held relative to the basket. This serves therefore to detect an acceleration of the basket and can be used to correct the determined by means of the above-described acceleration sensor Membranistbenchung. This is particularly useful when the speaker is present in an accelerated reference frame, as is the case for example when arranged in a motor vehicle.
- the total acceleration of the loudspeaker can be determined with the at least one further acceleration sensor.
- the membrane acceleration is now determined, for example, by subtracting the total acceleration from the initially measured membrane acceleration.
- a development of the invention provides that the unrecognized membrane actual state variable (s) is / are determined from the at least one detected membrane actual state variable.
- the membrane actual state variables of the membrane actual state have to be determined, that is to say measured.
- a corresponding differential equation system is achieved.
- the accuracy of the MembranistShs is greater, the more membrane actual state variables are detected.
- two of the membrane actual state variables namely the membrane initial position and the membrane protein acceleration, are detected and the membrane actual velocity subsequently determined therefrom. This is possible with comparatively little computational effort.
- the membrane state determined in this way is of high accuracy.
- a development of the invention provides that for determining the drive signal in addition to the Membranistschreib as a membrane target position, membrane target speed or diaphragm roll acceleration present diaphragm target state is determined, which is determined from an input signal of the speaker device.
- the loudspeaker device is therefore initially provided with the input signal, for example from a top source or the like. This sound source may for example be a component of the stereo system or the car-fidelity system.
- the nominal diaphragm state is determined.
- the nominal diaphragm position, the nominal diaphragm speed or the diaphragm rolling acceleration are used as the nominal diaphragm state, ie only a single one of these nominal diaphragm states.
- This target state of the membrane is now compared with the membrane state or the membrane state variable corresponding to the membrane target state variable. From this comparison results in the drive signal, which is applied to the voice coil of the speaker.
- the membrane roll acceleration serves as a membrane target state.
- a difference between the target membrane acceleration and the membrane acceleration, and in addition, the membrane stop position, the membrane velocity, and the membrane acceleration are input to a relationship from which the drive signal results as an output.
- x is the diaphragm position
- U (t) the voltage applied to the speaker
- m mass of the diaphragm
- L the inductance of the voice coil
- R the resistance of the loudspeaker
- ⁇ 0 the natural or resonant frequency of the loudspeaker
- Q the quality of the loudspeaker BI is the conversion ratio of current into force
- ⁇ t is a time interval
- a the membrane target acceleration
- a is the membrane actual acceleration
- v is the membrane actual velocity
- x is the membrane stop position
- t is the time.
- the time interval .DELTA.t corresponds to the reciprocal of the sample frequency f s .
- the drive voltage U (t) which is time-dependent, is used as the drive signal.
- the invention further relates to a loudspeaker device, in particular for carrying out the method according to one or more of the preceding claims, with at least one loudspeaker, wherein a detection device is provided for detecting at least one Membranistschreibs prevail a membrane of the loudspeaker.
- the loudspeaker device should be designed to detect a membrane state of the membrane comprising the membrane state variables membrane position, membrane velocity and membrane acceleration from the at least one detected state Determine Membranistschreibsucc and use immediately to determine a signal applied to a diaphragm in operative connection with the voice coil of the loudspeaker drive signal applied.
- the loudspeaker device may comprise a control device which serves to determine the actuation signal, in particular from the input signal taking into account the membrane actual state.
- the invention further relates to a device for noise compensation, comprising a sound detection device, a control device and a loudspeaker device, wherein the sound detection device detects a sound signal of a sound source and the control unit from the sound signal determines an anti-sound signal, which is supplied to the loudspeaker device as an input signal.
- the speaker device according to the above embodiments or for carrying out the method as described above is formed.
- the sound generated by the sound source can be at least largely compensated for by sound device or anti-sound signal is emitted by speaker device.
- the sound of the sound source is detected by means of the sound detection device as a sound signal.
- the control unit analyzes the sound signal and generates the anti-noise signal, which is subsequently provided or supplied to the loudspeaker device. Especially in such an application of the speaker device, it is of great importance that in addition to the frequency response and the phase of the anti-noise signal can be accurately reproduced. Therefore, the speaker device described above or the corresponding method is used.
- the sound source is an internal combustion engine.
- the internal combustion engine is usually associated with a motor vehicle. It is now the goal to reduce the sound or its intensity in an interior space and / or an exterior space of the motor vehicle, ie in an environment of the internal combustion engine.
- the device for noise compensation is used.
- this is used for sound damping in or parallel to an exhaust line of the internal combustion engine.
- targeted anti-sound is radiated or introduced into the exhaust system. This anti-noise is to destructively superimpose the muzzle sound emitted by the exhaust line.
- the speaker of the speaker device has the detection device that detects the Membranistposition, the Membranist Anthony and / or the Membranistbenchung and forwards it to the controller. Furthermore, the anti-noise signal is supplied to the control unit as an input signal.
- the input signal specifies the nominal diaphragm position, the nominal diaphragm speed or the nominal diaphragm acceleration.
- the controller now calculates, using the input quantities and typical loudspeaker characteristics, such as the electrical resistance, the inductance, the quality, the mass of the membrane, the natural frequency and the conversion ratio, the drive signal to be supplied to the loudspeaker, which leads to the desired course of the membrane initial state.
- the specific drive signal is conducted, for example, via an amplifier to the loudspeaker or its voice coil. Because usually not all of the membrane actual state variables of the membrane actual state are detected, the remaining ones, ie the non-specific membrane actual state variables, are determined by the control device from the detected membrane actual state variables, for example by solving differential equations describing the movement of the membrane. Thus, control frequencies up to 50 kHz or higher can be realized.
- the invention relates to an internal combustion engine of a motor vehicle with a device for noise compensation according to the preceding embodiments, wherein the internal combustion engine is the sound source.
- the FIG. 1 1 shows a region of a loudspeaker device 1, namely a loudspeaker 2.
- the loudspeaker 2 consists of a membrane 3, which is suspended so as to oscillate with respect to a housing 4 of the loudspeaker 2. This is realized in particular by means of a bead 5, via which the membrane 3 is attached to a basket 6 of the housing 4.
- the magnetic device 9 has at least one permanent magnet 10 and this covering pole plates 11.
- a return of the membrane 3 in its initial position, when the voice coil 7 is not energized, is achieved by means of a spider 12.
- a central recess of the membrane 3, at the edge of which the voice coil 7 acts on the membrane 3, is closed by a cap 13.
- Such a speaker 2 is in the in FIG. 2 used speaker device 1 shown.
- the loudspeaker device 1 has, in addition to the loudspeaker 2, a control device 14, a first detection device 15 and a second detection device 16.
- the first detection device 15 is designed as a distance sensor, preferably as a laser distance sensor.
- the first detection device 15 is arranged stationary relative to the housing 4 of the speaker 2 and allows a measurement of the Membranististposition.
- the second detection device 16 is an acceleration sensor for measuring a membrane acceleration.
- the second detection device 16 is arranged, for example, on the cap 13, which is displaceable together with the membrane 3.
- Both the specific with the first detecting means 15 is Membranistposition x and the specific means of the second detector 16 is a Membranistbeatung supplied to the controller fourteenth This first determines, for example by means of a calculation unit 17, from the Membranistposition is x and the Membranistbeatung a is the Membranist Ober v.
- the Membranistposition is x, the Membranist Anthony is v and is a Membranistbenchung together form a MembranistMap, which is provided by the calculation unit 17 of a further calculation unit 18 are available.
- the membrane state thus represents an input variable of the calculation unit 18.
- an input signal via an input 19 is made available to the loudspeaker device 1.
- the input signal is first converted into a desired state membrane which is intended for example as a membrane target position x, membrane rated speed v Soll or membrane target acceleration a is intended to be present. In the present Case is used as a membrane target state, the membrane target acceleration a is used. This is also supplied as an input to the calculation unit 18.
- the calculation unit 18 calculates a drive signal in the form of a drive voltage U from its input variables, that is to say the target state of the membrane and the membrane state. This is supplied by the control device 14 to the loudspeaker 2 or its voice coil 7. With such a loudspeaker device 1, a high-precision reproduction of the input signal is possible. In particular, not only the frequency but also the phase of the input signal is reproduced very accurately.
- the speaker device 1 is used for example in the context of a device for noise compensation.
- This additionally has a sound detection device, not shown here, by means of which a sound signal of a sound source, for example an internal combustion engine, is detected.
- a control device of the device determines from this sound signal an anti-noise signal, which is then supplied to the loudspeaker device 1 as an input signal via the input 19. By outputting the anti-noise signal by means of the loudspeaker device 1, the sound signal is at least partially canceled.
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Description
Die Erfindung betrifft ein Verfahren zum Betreiben einer Lautsprechereinrichtung mit zumindest einem Lautsprecher, wobei wenigstens eine Membranistzustandsgröße einer Membran des Lautsprechers von einer Erfassungseinrichtung erfasst wird. Die Erfindung betrifft weiterhin eine Lautsprechereinrichtung sowie eine Vorrichtung zur Lärmkompensation.The invention relates to a method for operating a loudspeaker device having at least one loudspeaker, wherein at least one membrane actual state variable of a diaphragm of the loudspeaker is detected by a detection device. The invention further relates to a speaker device and a device for noise compensation.
Verfahren der eingangs genannten Art sind aus dem Stand der Technik bekannt. Insbesondere ist die Verwendung eines elektrodynamischen Lautsprechers mit Schwingspule und Membran als Schallquelle hinlänglich bekannt. Ein derartiger Lautsprecher findet Anwendung als Bestandteil von Stereoanlagen, beispielsweise im häuslichen Bereich, bis hin zu hochwertigen Car-Fidelity-Anlagen im automotiven Bereich. Seine wesentliche Eigenschaft ist die Umwandlung eines zeitabhängigen Ansteuersignals, das an ihn beziehungsweise seine Anschlüsse angelegt wird, in einen zeitabhängigen Schallpegelverlauf, also insbesondere einen Druck-, Dichte- und Schnelleverlauf, der in die Umgebung des Lautsprechers abgegeben wird. Das Ansteuersignal wird üblicherweise an die Schwingspule des Lautsprechers angelegt, welche mit der Membran in Wirkverbindung steht und diese entsprechend des Ansteuersignals verlagert. Die Umwandlung des Ansteuersignals erfolgt im Allgemeinen derart, dass eine Phasenverschiebung zwischen Ansteuersignal und dem erzeugten Schallpegel keine Konstante ist, sondern als Funktion der Frequenz vorliegt. Dies hat zur Folge, dass das Ansteuersignal beziehungsweise dessen Form, sofern es sich nicht um einen reinen Sinusverlauf handelt, nicht vollständig erhalten bleibt, wenn er in den Schallverlauf umgewandelt wird. Somit ist es in der Regel nicht möglich, die Membran des Lautsprechers in Echtzeit einem vorgegebenen Positions-, Geschwindigkeits- und/oder Beschleunigungsverlauf folgen zu lassen. Vielmehr werden nur die Frequenzen in einem Frequenzraum, nicht jedoch die Phase beziehungsweise Phasenverschiebung, korrekt wiedergegeben. Da das menschliche Gehör Phasen nicht unterscheiden kann, ist ein derartiges Verhalten des Lautsprechers für viele Anwendungen jedoch ausreichend.Methods of the type mentioned are known from the prior art. In particular, the use of an electrodynamic loudspeaker with voice coil and membrane as sound source is well known. Such a speaker is used as part of stereos, for example, in the home, up to high-quality car fidelity systems in the automotive sector. Its essential feature is the conversion of a time-dependent drive signal, which is applied to it or its terminals, in a time-dependent sound level profile, ie in particular a pressure, density and rapid response, which is delivered to the environment of the speaker. The drive signal is usually applied to the voice coil of the loudspeaker, which is in operative connection with the membrane and this displaced according to the drive signal. The conversion of the drive signal is generally such that a phase shift between the drive signal and the generated sound level is not a constant, but is present as a function of the frequency. This has the consequence that the drive signal or its shape, if it is not a pure sinusoidal, not completely retained when it is converted into the sound history. Thus, it is usually not possible to follow the membrane of the speaker in real time a predetermined position, speed and / or acceleration. Rather, only the frequencies in a frequency space, but not the phase or phase shift, correctly reproduced. However, since human hearing can not distinguish phases, such speaker behavior is sufficient for many applications.
Um eine präzisere Umsetzung des Ansteuersignals in Schall zu erreichen, ist es bekannt, im Rahmen des "Motional Feedback"-Prinzips eine Membranistzustandsgröße der Membran des Lautsprechers zu erfassen. Anschließend wird diese Membranistzustandsgröße zur Ansteuerung des Lautsprechers herangezogen. Auch bei einer derartigen Vorgehensweise verändert sich jedoch die Phasenverschiebung zwischen Ansteuersignal und erzeugtem Schall, üblicherweise auch hier in Abhängigkeit von der Frequenz.In order to achieve a more accurate implementation of the drive signal in sound, it is known to detect a Membranistzustandsgröße of the membrane of the speaker as part of the "motional feedback" principle. Subsequently, this membrane state becomes large used to control the speaker. Even with such a procedure, however, the phase shift between control signal and generated sound changes, usually also here as a function of the frequency.
Es ist daher Aufgabe der Erfindung, ein Verfahren vorzuschlagen, welches den eingangs genannten Nachteil nicht aufweist, sondern eine äußerst präzise Ansteuerung des Lautsprechers ermöglicht, bei welcher insbesondere die Phasenverschiebung zwischen dem Ansteuersignal und dem erzeugten Schall auch bei verschiedenen Frequenzen, vorzugsweise über das gesamte mit dem Lautsprecher umsetzbare Frequenzspektrum, konstant bleibt.
Dies wird erfindungsgemäß mit dem Verfahren mit den Merkmalen des Anspruchs 1 erreicht. Dabei ist vorgesehen, dass ein Membranistzustand der Membran, umfassend die Membranistzustandsgrößen Membranistposition, Membranistgeschwindigkeit und Membranistbeschleunigung, aus der wenigstens einen erfassten Membranistzustandsgröße bestimmt und unmittelbar zum Bestimmen eines Ansteuersignals herangezogen wird, das an einer mit der Membran in Wirkverbindung stehenden Schwingspule des Lautsprechers angelegt wird. Um die vorstehend genannten Vorteile zu erreichen, werden alle drei genannten Membranistzustandsgrößen, also die Membranistposition, die Membranistgeschwindigkeit und die Membranistbeschleunigung, aus der wenigstens einen erfassten Membranistzustandsgröße bestimmt. Die Membranistposition, die Membranistgeschwindigkeit und die Membranistbeschleunigung sind dabei in dem Membranistzustand zusammengefasst. Dieser wird anschließend als Eingangsgröße zum Bestimmen des Ansteuersignals herangezogen. Das bedeutet, dass nicht lediglich eine einzige Membranistzustandsgröße oder einzelne der Membranistzustandsgrößen verwendet werden, um das Ansteuersignal zu bestimmen. Vielmehr soll der gesamte Membranistzustand, welcher aus den drei genannten Membranistzustandsgrößen besteht, verwendet werden. Auf diese Weise wird eine äußerst präzise Umsetzung des Ansteuersignals erzielt.
Zu diesem Zweck wird beispielsweise der Lautsprechereinrichtung ein Eingangssignal zur Verfügung gestellt, welches neben dem Membranistzustand als Eingangsgröße zur Bestimmung des Ansteuersignals dient. Das Ansteuersignal liegt insoweit als Ausgangsgröße vor. Die Beziehung zwischen dem Membranistzustand beziehungsweise dessen Membranistzustandsgrößen und dem Ansteuersignal ist beispielsweise linear. Es kann jedoch auch eine nichtlineare Beziehung vorgesehen sein. Zusätzlich kann der Membranistzustand auch wenigstens einen Istdruck, aufweisen, beispielsweise den Schallistdruck hinter oder vor der Membran des Lautsprechers, insbesondere in einem bestimmten Abstand zu einer Ruheposition der Membran. Bevorzugt werden sowohl der Istdruck vor als auch der Istdruck hinter der Membran bestimmt. Das Bestimmen kann dabei durch Messen mittels einer Messeinrichtung oder alternativ durch Berechnen in einem Berechnungsmodell erfolgen. Das Berechnungsmodell kann dabei beispielsweise wenigstens eine der Membranistzustandsgrößen als Eingangsgröße und den Istdruck als Ausgangsgröße aufweisen.It is therefore an object of the invention to provide a method which does not have the disadvantage mentioned above, but allows extremely precise control of the speaker, in which in particular the phase shift between the drive signal and the generated sound at different frequencies, preferably over the entire the frequency spectrum that can be converted to the loudspeaker remains constant.
This is achieved according to the invention by the method having the features of
For this purpose, for example, an input signal is provided to the loudspeaker device, which serves as an input variable for determining the control signal in addition to the membrane state. The drive signal is so far as the output size. The relationship between the membrane state or its Membranistzustandsgrößen and the drive signal, for example, is linear. It can however, a non-linear relationship may also be provided. In addition, the membrane state may be Also, at least one actual pressure, for example, the Schallistdruck behind or in front of the diaphragm of the speaker, in particular at a certain distance to a rest position of the membrane. Both the actual pressure before and the actual pressure behind the membrane are preferably determined. The determination can be carried out by measuring by means of a measuring device or alternatively by calculating in a calculation model. The calculation model can have, for example, at least one of the membrane actual state variables as the input variable and the actual pressure as the output variable.
Eine Weiterbildung der Erfindung sieht vor, dass als die wenigstens eine erfasste Membranistzustandsgröße die Membranistposition, die Membranistgeschwindigkeit oder die Membranistbeschleunigung verwendet wird. Mithilfe der Erfassungseinrichtung wird also wenigstens eine der Membranistzustandsgrößen des Membranistzustands erfasst. Beispielsweise wird lediglich eine der Membranistzustandsgrößen erfasst beziehungsweise gemessen. Bevorzugt werden jedoch wenigstens zwei, insbesondere genau zwei, der Membranistzustandsgrößen mithilfe der Erfassungseinrichtung erfasst. Diese sind insbesondere die Membranistposition und die Membranistbeschleunigung.A further development of the invention provides that the membrane stop position, the membrane actual velocity or the membrane histamine acceleration is used as the at least one detected membrane actual state variable. With the aid of the detection device, at least one of the membrane actual state variables of the membrane actual state is detected. For example, only one of the membrane actual state variables is detected or measured. However, at least two, in particular exactly two, of the membrane actual state variables are preferably detected by means of the detection device. These are in particular the membrane stop position and the membrane acceleration.
Eine Weiterbildung der Erfindung sieht vor, dass zum Erfassen der Membranistposition ein Distanzsensor, insbesondere ein optischer Distanzsensor, bevorzugt ein Laserdistanzsensor, als Erfassungseinrichtung verwendet wird. Der Distanzsensor ist derart ortsfest angeordnet, dass er seine Entfernung von der Membran mit ausreichender Genauigkeit erfassen kann. Aus der mithilfe des Distanzsensors erfassten Distanz kann anschließend die Auslenkung der Membran und mithin die Membranistposition bestimmt werden. Als Distanzsensor kommt bevorzugt der optische Distanzsensor zum Einsatz, weil mit diesem ein berührungsloses Erfassen der Distanz möglich ist. Der optische Distanzsensor verfügt über eine Lichtquelle und einen Lichtsensor, wobei die Lichtquelle auf die Membran gerichtet und der Lichtsensor derart angeordnet ist, dass er das von der Membran reflektierte Licht der Lichtquelle erfasst. Der optische Distanzsensor ermittelt die Distanz beispielsweise mittels einer Laufzeitmessung des von der Lichtquelle ausgesandten Lichts, mittels einer Bestimmung einer Phasenlage und/oder mittels Triangulation. Letzteres ist besonders bevorzugt der Fall, wenn der optische Distanzsensor als Laserdistanzsensor vorliegt (Lasertriangulation). Der Laserdistanzsensor verfügt gemäß seiner Bezeichnung über einen als Lichtquelle dienenden Laseremitter.A development of the invention provides that for detecting the Membranistposition a distance sensor, in particular an optical distance sensor, preferably a laser distance sensor, is used as a detection device. The distance sensor is arranged stationary so that it can detect its distance from the membrane with sufficient accuracy. From the distance detected by means of the distance sensor, the deflection of the membrane and thus the membrane position can be determined. As a distance sensor is preferably the optical distance sensor used, because with this a contactless detection of the distance is possible. The optical distance sensor has a light source and a light sensor, wherein the light source is directed onto the membrane and the light sensor is arranged such that it detects the light of the light source reflected by the membrane. The optical distance sensor determines the distance, for example by means of a transit time measurement of the light emitted by the light source, by means of a determination of a phase position and / or by means of triangulation. The latter is particularly preferably the case when the optical distance sensor is present as a laser distance sensor (laser triangulation). The laser distance sensor according to its name has a laser emitter serving as a light source.
Eine Weiterbildung der Erfindung sieht vor, dass zum Erfassen der Membranistbeschleunigung ein auf der Membran angeordneter Beschleunigungssensor, insbesondere ein piezoelektronischer Sensor oder ein MEMS-Sensor, verwendet wird. Auf diese Weise ist ein unmittelbares Bestimmen der Membranistbeschleunigung, also nicht lediglich mittelbar aus wenigstens einer anderen Membranistzustandsgröße, möglich. Zur Durchführung der Messung der Membranistbeschleunigung soll der Beschleunigungssensor derart unmittelbar auf der Membran angeordnet sein, dass er sich zusammen mit dieser entsprechend des Ansteuersignals bewegt. Grundsätzlich kann jeder beliebige Beschleunigungssensor verwendet werden. Besonders bevorzugt kommt jedoch ein piezoelektronischer Sensor oder ein MEMS-Sensor (MEMS: micro-electromechanical system). Selbstverständlich sind auch mehrere Beschleunigungssensoren auf der Membran anordenbar. Zusätzlich kann wenigstens ein weiterer Beschleunigungssensor an einem Korb des Lautsprechers oder einem bezüglich des Korbs ortsfest gehaltenen Element vorgesehen sein. Dieser dient mithin der Erfassung einer Beschleunigung des Korbs und kann zur Korrektur der mit Hilfe des vorstehend beschriebenen Beschleunigungssensors bestimmten Membranistbeschleunigung herangezogen werden. Dies ist insbesondere dann sinnvoll, wenn der Lautsprecher in einem beschleunigten Bezugssystem vorliegt, wie dies beispielsweise bei Anordnung in einem Kraftfahrzeug der Fall ist. Mit dem wenigstens einen weiteren Beschleunigungssensor ist die Gesamtbeschleunigung des Lautsprechers bestimmbar. Die Membranistbeschleunigung wird nun beispielsweise durch Subtraktion der Gesamtbeschleunigung von der zunächst gemessenen Membranistbeschleunigung bestimmt.A development of the invention provides that, for detecting the acceleration of the membrane, an acceleration sensor arranged on the diaphragm, in particular a piezoelectric sensor or a MEMS sensor is used. In this way, it is possible to directly determine the membrane acceleration, that is to say not only indirectly from at least one other membrane state variable. To carry out the measurement of the membrane acceleration, the acceleration sensor should be arranged directly on the membrane in such a way that it moves together with it according to the drive signal. In principle, any acceleration sensor can be used. However, particularly preferred is a piezoelectric sensor or a MEMS sensor (MEMS: micro-electromechanical system). Of course, several acceleration sensors can be arranged on the membrane. In addition, at least one further acceleration sensor may be provided on a basket of the loudspeaker or on an element fixedly held relative to the basket. This serves therefore to detect an acceleration of the basket and can be used to correct the determined by means of the above-described acceleration sensor Membranistbeschleunigung. This is particularly useful when the speaker is present in an accelerated reference frame, as is the case for example when arranged in a motor vehicle. The total acceleration of the loudspeaker can be determined with the at least one further acceleration sensor. The membrane acceleration is now determined, for example, by subtracting the total acceleration from the initially measured membrane acceleration.
Eine Weiterbildung der Erfindung sieht vor, dass aus der wenigstens einen erfassten Membranistzustandsgröße die nichterfasste(n) Membranistzustandsgröße(n) bestimmt wird/werden. Wie vorstehend bereits ausgeführt, müssen nicht alle Membranistzustandsgrößen des Membranistzustands ermittelt, das heißt gemessen, werden. Es ist vielmehr möglich, lediglich einige der Membranistzustandsgrößen zu erfassen und die nicht erfassten aus diesen zu berechnen. Zu diesem Zweck wird beispielsweise ein entsprechendes Differenzialgleichungssystem gelöst. Grundsätzlich gilt jedoch, dass die Genauigkeit des Membranistzustands umso größer ist, je mehr Membranistzustandsgrößen erfasst werden. Besonders bevorzugt werden zwei der Membranistzustandsgrößen, nämlich die Membranistposition und die Membranistbeschleunigung, erfasst und die Membranistgeschwindigkeit anschließend aus diesen bestimmt. Dies ist mit vergleichsweise geringem Rechenaufwand möglich. Gleichzeitig ist der auf diese Weise bestimmte Membranistzustand von hoher Genauigkeit.A development of the invention provides that the unrecognized membrane actual state variable (s) is / are determined from the at least one detected membrane actual state variable. As already stated above, not all membrane actual state variables of the membrane actual state have to be determined, that is to say measured. On the contrary, it is possible to detect only some of the membrane actual state quantities and to calculate the unrecorded ones of them. For this purpose, for example, a corresponding differential equation system is achieved. Basically, however, the accuracy of the Membranistzustands is greater, the more membrane actual state variables are detected. Particularly preferably, two of the membrane actual state variables, namely the membrane initial position and the membrane protein acceleration, are detected and the membrane actual velocity subsequently determined therefrom. This is possible with comparatively little computational effort. At the same time, the membrane state determined in this way is of high accuracy.
Eine Weiterbildung der Erfindung sieht vor, dass zum Bestimmen des Ansteuersignals neben dem Membranistzustand ein als Membransollposition, Membransollgeschwindigkeit oder Membransollbeschleunigung vorliegender Membransollzustand herangezogen wird, der aus einem Eingangssignal der Lautsprechereinrichtung bestimmt wird. Der Lautsprechereinrichtung wird demnach zunächst das Einganssignal zur Verfügung gestellt, beispielsweise von einer Topquelle oder dergleichen. Diese Tonquelle kann beispielsweise eine Komponente der Stereoanlage beziehungsweise der Car-Fidelity-Anlage sein. Aus diesem Eingangssignal wird nun der Membransollzustand bestimmt. Als Membransollzustand findet dabei die Membransollposition, die Membransollgeschwindigkeit oder die Membransollbeschleunigung Verwendung, also lediglich eine einzige dieser Membransollzustandsgrößen. Dieser Membransollzustand wird nun mit dem Membranistzustand beziehungsweise der der Membransollzustandsgröße entsprechenden Membranistzustandsgröße verglichen. Aus diesem Vergleich resultiert das Ansteuersignal, welches an die Schwingspule des Lautsprechers angelegt wird. Vorzugsweise dient die Membransollbeschleunigung als Membransollzustand. In diesem Fall gehen beispielsweise eine Differenz zwischen der Membransollbeschleunigung und der Membranistbeschleunigung, und zusätzlich die Membranistposition, die Membranistgeschwindigkeit und die Membranistbeschleunigung als Eingangsgrößen in eine Beziehung ein, aus welcher das Ansteuersignal als Ausgangsgröße resultiert.A development of the invention provides that for determining the drive signal in addition to the Membranistzustand as a membrane target position, membrane target speed or diaphragm roll acceleration present diaphragm target state is determined, which is determined from an input signal of the speaker device. The loudspeaker device is therefore initially provided with the input signal, for example from a top source or the like. This sound source may for example be a component of the stereo system or the car-fidelity system. From this input signal, the nominal diaphragm state is determined. The nominal diaphragm position, the nominal diaphragm speed or the diaphragm rolling acceleration are used as the nominal diaphragm state, ie only a single one of these nominal diaphragm states. This target state of the membrane is now compared with the membrane state or the membrane state variable corresponding to the membrane target state variable. From this comparison results in the drive signal, which is applied to the voice coil of the speaker. Preferably, the membrane roll acceleration serves as a membrane target state. In this case, for example, a difference between the target membrane acceleration and the membrane acceleration, and in addition, the membrane stop position, the membrane velocity, and the membrane acceleration, are input to a relationship from which the drive signal results as an output.
Eine Weiterbildung der Erfindung sieht vor, dass als Ansteuersignal eine Ansteuerspannung verwendet wird, die aus der Beziehung
Als Ansteuersignal wird in der beschriebenen Ausführungsform also die Ansteuerspannung U(t) verwendet, welche zeitabhängig ist. Die vorstehend genannte Beziehung leitet sich aus den Gleichungen
Die Erfindung betrifft weiterhin eine Lautsprechereinrichtung, insbesondere zur Durchführung des Verfahrens nach einem oder mehreren der vorhergehenden Ansprüche, mit zumindest einem Lautsprecher, wobei eine Erfassungseinrichtung zum Erfassen wenigstens einer Membranistzustandsgröße einer Membran des Lautsprechers vorgesehen ist. Dabei soll die Lautsprechereinrichtung dazu ausgebildet sein, einen Membranistzustand der Membran, umfassend die Membranistzustandsgrößen Membranistposition, Membranistgeschwindigkeit und Membranistbeschleunigung, aus der wenigstens einen erfassten Membranistzustandsgröße zu bestimmen und unmittelbar zum Bestimmen eines an einer mit der Membran in Wirkverbindung stehenden Schwingspule des Lautsprechers angelegten Ansteuersignals heranzuziehen. Neben dem Lautsprecher kann die Lautsprechereinrichtung ein Steuergerät umfassen, welches dem Bestimmen des Ansteuersignals, insbesondere aus dem Eingangssignal unter Berücksichtigung des Membranistzustands, dient.The invention further relates to a loudspeaker device, in particular for carrying out the method according to one or more of the preceding claims, with at least one loudspeaker, wherein a detection device is provided for detecting at least one Membranistzustandsgröße a membrane of the loudspeaker. In this case, the loudspeaker device should be designed to detect a membrane state of the membrane comprising the membrane state variables membrane position, membrane velocity and membrane acceleration from the at least one detected state Determine Membranistzustandsgröße and use immediately to determine a signal applied to a diaphragm in operative connection with the voice coil of the loudspeaker drive signal applied. In addition to the loudspeaker, the loudspeaker device may comprise a control device which serves to determine the actuation signal, in particular from the input signal taking into account the membrane actual state.
Die Erfindung betrifft weiterhin eine Vorrichtung zur Lärmkompensation, aufweisend eine Schallerfassungseinrichtung, ein Steuergerät und eine Lautsprechereinrichtung, wobei die Schallerfassungseinrichtung ein Schallsignal einer Schallquelle erfasst und das Steuergerät aus dem Schallsignal ein Antischallsignal bestimmt, das der Lautsprechereinrichtung als Eingangssignal zugeführt wird. Dabei ist vorgesehen, dass die Lautsprechereinrichtung gemäß den vorstehenden Ausführungen oder zur Durchführung des Verfahrens wie vorstehend beschrieben ausgebildet ist. Mithilfe der Vorrichtung kann der von der Schallquelle erzeugte Schall zumindest weitestgehend kompensiert werden, indem durch Lautsprechereinrichtung Antischall beziehungsweise das Antischallsignal ausgesandt wird. Zu diesem Zweck wird der Schall der Schallquelle mithilfe der Schallerfassungseinrichtung als Schallsignal erfasst. Das Steuergerät analysiert das Schallsignal und erzeugt das Antischallsignal, welches anschließend der Lautsprechereinrichtung bereitgestellt beziehungsweise zugeführt wird. Speziell bei einer solchen Anwendung der Lautsprechereinrichtung ist es von großer Bedeutung, dass neben dem Frequenzverlauf auch der Phasenverlauf des Antischallsignals präzise wiedergegeben werden kann. Daher kommt die vorstehend beschriebene Lautsprechereinrichtung beziehungsweise das entsprechende Verfahren zum Einsatz.The invention further relates to a device for noise compensation, comprising a sound detection device, a control device and a loudspeaker device, wherein the sound detection device detects a sound signal of a sound source and the control unit from the sound signal determines an anti-sound signal, which is supplied to the loudspeaker device as an input signal. It is provided that the speaker device according to the above embodiments or for carrying out the method as described above is formed. By means of the device, the sound generated by the sound source can be at least largely compensated for by sound device or anti-sound signal is emitted by speaker device. For this purpose, the sound of the sound source is detected by means of the sound detection device as a sound signal. The control unit analyzes the sound signal and generates the anti-noise signal, which is subsequently provided or supplied to the loudspeaker device. Especially in such an application of the speaker device, it is of great importance that in addition to the frequency response and the phase of the anti-noise signal can be accurately reproduced. Therefore, the speaker device described above or the corresponding method is used.
Eine Weiterbildung der Erfindung sieht vor, dass die Schallquelle eine Brennkraftmaschine ist. Die Brennkraftmaschine ist üblicherweise einem Kraftfahrzeug zugeordnet. Es ist nun das Ziel, den Schall beziehungsweise dessen Intensität in einem Innenraum und/oder einem Außenraum des Kraftfahrzeugs, also in einer Umgebung der Brennkraftmaschine, zu reduzieren. Zu diesem Zweck kommt die Vorrichtung zur Lärmkompensation zum Einsatz. Insbesondere ist es vorgesehen, dass diese zur Schalldämpfung in oder parallel zu einem Abgasstrang der Brennkraftmaschine eingesetzt wird. Dabei wird gezielt Antischall abgestrahlt beziehungsweise in den Abgasstrang eingebracht. Dieser Antischall soll den von dem Abgasstrang emittierten Mündungsschall destruktiv überlagern. Es ist daher vorteilhaft, eine Schallquelle zu verwenden, bei welcher sich der Schall sowohl hinsichtlich seiner Amplitude als auch seiner Phase beziehungsweise Phasenverschiebung in Echtzeit einstellen lässt. Das bedeutet, dass die Möglichkeit bestehen muss, den Positions-, Geschwindigkeits- und/oder Beschleunigungsverlauf der schallerzeugenden Membran vorzugeben. Aus diesem Grund kommt die vorstehend erläuterte Schallerfassungseinrichtung beziehungsweise das entsprechende Verfahren zum Einsatz.A development of the invention provides that the sound source is an internal combustion engine. The internal combustion engine is usually associated with a motor vehicle. It is now the goal to reduce the sound or its intensity in an interior space and / or an exterior space of the motor vehicle, ie in an environment of the internal combustion engine. For this purpose, the device for noise compensation is used. In particular, it is provided that this is used for sound damping in or parallel to an exhaust line of the internal combustion engine. In this case, targeted anti-sound is radiated or introduced into the exhaust system. This anti-noise is to destructively superimpose the muzzle sound emitted by the exhaust line. It is therefore advantageous to use a sound source in which the sound can be adjusted in real time both in terms of its amplitude and its phase or phase shift. That means the possibility exist must specify the position, speed and / or acceleration of the sound-generating membrane. For this reason, the above-described sound detection device or the corresponding method is used.
Dabei ist vorgesehen, dass der Lautsprecher der Lautsprechereinrichtung über die Erfassungseinrichtung verfügt, die die Membranistposition, die Membranistgeschwindigkeit und/oder die Membranistbeschleunigung erfasst und an das Steuergerät weiterleitet. Weiterhin wird das Antischallsignal dem Steuergerät als Eingangssignal zugeführt. Das Eingangssignal spezifiziert dabei die Membransollposition, die Membransollgeschwindigkeit oder die Membransollbeschleunigung. Das Steuergerät berechnet nun unter Verwendung der Eingangsgrößen und typischer Lautsprecherkennwerte, wie beispielsweise dem elektrischen Widerstand, der Induktivität, der Güte, der Masse der Membran, der Eigenfrequenz und dem Umsetzungsverhältnis das dem Lautsprecher zuzuführende Ansteuersignal, der zu dem gewünschten Verlauf des Membranistzustands führt. Das bestimmte Ansteuersignal wird beispielsweise über einen Verstärker an den Lautsprecher beziehungsweise dessen Schwingspule geführt. Weil üblicherweise lediglich nicht alle der Membranistzustandsgrößen des Membranistzustands erfasst werden, werden die übrigen, also die nicht bestimmten Membranistzustandsgrößen, von dem Steuergerät aus den erfassten Membranistzustandsgrößen bestimmt, beispielsweise durch Lösen von Differenzialgleichungen, die die Bewegung der Membran beschreiben. Somit lassen sich Regelfrequenzen bis 50 kHz oder höher realisieren.It is provided that the speaker of the speaker device has the detection device that detects the Membranistposition, the Membranistgeschwindigkeit and / or the Membranistbeschleunigung and forwards it to the controller. Furthermore, the anti-noise signal is supplied to the control unit as an input signal. The input signal specifies the nominal diaphragm position, the nominal diaphragm speed or the nominal diaphragm acceleration. The controller now calculates, using the input quantities and typical loudspeaker characteristics, such as the electrical resistance, the inductance, the quality, the mass of the membrane, the natural frequency and the conversion ratio, the drive signal to be supplied to the loudspeaker, which leads to the desired course of the membrane initial state. The specific drive signal is conducted, for example, via an amplifier to the loudspeaker or its voice coil. Because usually not all of the membrane actual state variables of the membrane actual state are detected, the remaining ones, ie the non-specific membrane actual state variables, are determined by the control device from the detected membrane actual state variables, for example by solving differential equations describing the movement of the membrane. Thus, control frequencies up to 50 kHz or higher can be realized.
Die Erfindung betrifft schließlich eine Brennkraftmaschine eines Kraftfahrzeugs mit einer Vorrichtung zur Lärmkompensation gemäß den vorstehenden Ausführungen, wobei die Brennkraftmaschine die Schallquelle ist.Finally, the invention relates to an internal combustion engine of a motor vehicle with a device for noise compensation according to the preceding embodiments, wherein the internal combustion engine is the sound source.
Die Erfindung wird nachfolgend anhand der in der Zeichnung dargestellten Ausführungsbeispiele näher erläutert, ohne dass eine Beschränkung der Erfindung erfolgt. Dabei zeigt:
Figur 1- einen Querschnitt durch einen Lautsprecher einer Lautsprechereinrichtung, und
Figur 2- eine schematische Darstellung der Lautsprechereinrichtung.
- FIG. 1
- a cross section through a speaker of a speaker device, and
- FIG. 2
- a schematic representation of the speaker device.
Die
Ein derartiger Lautsprecher 2 wird in der in
Die Membranistposition xist, die Membranistgeschwindigkeit vist und die Membranistbeschleunigung aist bilden zusammen einen Membranistzustand, welcher von der Berechnungseinheit 17 einer weiteren Berechnungseinheit 18 zur Verfügung gestellt wird. Der Membranistzustand stellt somit eine Eingangsgröße der Berechnungseinheit 18 dar. Weiterhin wird der Lautsprechereinrichtung 1 ein Eingangssignal über einen Eingang 19 zur Verfügung gestellt. Das Eingangssignal wird zunächst in einen Membransollzustand umgesetzt, welcher beispielsweise als Membransollposition xsoll, Membransollgeschwindigkeit vsoll oder Membransollbeschleunigung asoll vorliegen soll. In dem vorliegenden Fall wird als Membransollzustand die Membransollbeschleunigung asoll verwendet. Diese wird ebenfalls als Eingangsgröße der Berechnungseinheit 18 zugeführt. Die Berechnungseinheit 18 berechnet aus ihren Eingangsgrößen, also dem Membransollzustand und dem Membranistzustand, ein Ansteuersignal in Form einer Ansteuerspannung U. Diese wird von dem Steuergerät 14 dem Lautsprecher 2 beziehungsweise dessen Schwingspule 7 zugeführt. Mit einer derartigen Lautsprechereinrichtung 1 ist ein hochgenaues Wiedergeben des Eingangssignals möglich. Insbesondere wird nicht nur die Frequenz, sondern auch die Phase des Eingangssignals sehr genau reproduziert.The Membranistposition is x, the Membranistgeschwindigkeit is v and is a Membranistbeschleunigung together form a Membranistzustand, which is provided by the
Die Lautsprechereinrichtung 1 wird beispielsweise im Rahmen einer Vorrichtung zur Lärmkompensation eingesetzt. Diese weist zusätzlich eine hier nicht dargestellte Schallerfassungseinrichtung auf, mittels welcher ein Schallsignal einer Schallquelle, beispielsweise einer Brennkraftmaschine, erfasst wird. Ein Steuergerät der Vorrichtung (ebenfalls nicht dargestellt) bestimmt aus diesem Schallsignal ein Antischallsignal, welches anschließend der Lautsprechereinrichtung 1 als Eingangssignal über den Eingang 19 zugeführt wird. Durch das Ausgeben des Antischallsignals mittels der Lautsprechereinrichtung 1 wird das Schallsignal zumindest teilweise aufgehoben.The
- 11
- LautsprechereinrichtungSpeaker Setup
- 22
- Lautsprecherspeaker
- 33
- Membranmembrane
- 44
- Gehäusecasing
- 55
- SickeBeading
- 66
- Korbbasket
- 77
- Schwingspulevoice coil
- 88th
- Spulenführungspool guide
- 99
- Magneteinrichtungmagnetic device
- 1010
- Permanentmagnetpermanent magnet
- 1111
- Polplattepole plate
- 1212
- Spinnespider
- 1313
- Abdeckkappecap
- 1414
- Steuergerätcontrol unit
- 1515
- 1. Erfassungseinrichtung1st detection device
- 1616
- 2. Erfassungseinrichtung2. Detection device
- 1717
- Berechnungseinheitcalculation unit
- 1818
- Berechnungseinheitcalculation unit
- 1919
- Eingangentrance
Claims (9)
- Method of operating a loudspeaker system (1) with at least one loudspeaker (2) wherein at least one membrane actual status variable of a membrane (3) of the loudspeaker (2) is recorded by a recording device (15, 16), wherein a membrane status of the membrane, comprising the membrane actual status variables membrane actual position (xist), membrane actual speed (vist) and membrane actual acceleration (aist) is determined from at least one of the recorded membrane actual status variables (xist, aist) and is used directly to determine a control signal (U(t)) which is fed to a membrane (3) which has an operative connection to a voice coil (7) of the loudspeaker (2), characterised in that it is used as the control signal (U(t)) of a control voltage determined from the equation
- Method according to claim 1 characterised in that used as the at least one recorded membrane actual value variable are the membrane actual position (xist), membrane actual speed (vist) and membrane actual acceleration (aist).
- Method according to any one of the preceding claims characterised in that in order to record the membrane actual position (xist) a distance sensor (15), more particularly an optical distance sensor, preferably a laser distance sensor is used as the recording device (15).
- Method according to any one of the preceding claims characterised in that in order to record the membrane actual acceleration (aist) an acceleration sensor arranged on the membrane (3), more particularly a piezoelectric sensor or an MEMS sensor, is used as the recording device (16).
- Method according to any one of the preceding claims characterised in that from the at least one recorded membrane actual status variable (xist, aist) the unrecorded membrane actual status variable(s) (vist) is/are recorded.
- Method according to any one of the preceding claims characterised in that in order to determine the control signal (U(t)), in addition to the membrane actual status, a membrane nominal status present as the membrane nominal position (xsoll), membrane nominal speed (vsoll) or membrane nominal acceleration (asoll) is used which is determined from an input signal of the loudspeaker system (1).
- Loudspeaker system (1), more particularly for implementing the method in accordance with one or more of the preceding claims, with at least one loudspeaker (2), wherein a recording device (15, 16) for recording at least one membrane actual status variable of a membrane (3) of the loudspeaker (2) is provided, wherein the loudspeaker system (1) is designed to determine a membrane actual status of the membrane (3), comprising the membrane actual status variable membrane actual position (xist), membrane actual speed (vist) and membrane actual acceleration (aist), from the at least one recorded membrane actual status variable (xist, aist) and to directly use it to determine a control signal (U(t)) applied to a voice coil (7) of the loudspeaker (2) interacting with the membrane (3), characterised in that used as the control signal (U(t)) is a control voltage determined from the equation
- Device for noise compensation, comprising a sound recording device, a control device and a loudspeaker system (1) wherein the sound recording device records a sound signal of a sound source and the control device determines an anti-noise signal from the sound signal which is supplied to the loudspeaker system (1) as an input signal, characterised in that the loudspeaker system (1) is designed in accordance with claim 7.
- Device according to claim 8 characterised in that the sound source is an internal combustion engine.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102012005893A DE102012005893A1 (en) | 2012-03-23 | 2012-03-23 | Method for operating a loudspeaker device, loudspeaker device and device for noise compensation |
PCT/EP2013/000705 WO2013139445A2 (en) | 2012-03-23 | 2013-03-09 | Method for operating a loudspeaker device, loudspeaker device, and device for noise compensation |
Publications (2)
Publication Number | Publication Date |
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EP2829079A2 EP2829079A2 (en) | 2015-01-28 |
EP2829079B1 true EP2829079B1 (en) | 2016-06-01 |
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Application Number | Title | Priority Date | Filing Date |
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EP13710788.4A Active EP2829079B1 (en) | 2012-03-23 | 2013-03-09 | Method of operating a loudspeaker, loudspeaker and arrangement for noise compensation |
Country Status (5)
Country | Link |
---|---|
US (1) | US20150086027A1 (en) |
EP (1) | EP2829079B1 (en) |
CN (1) | CN104205873B (en) |
DE (1) | DE102012005893A1 (en) |
WO (1) | WO2013139445A2 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013223416A1 (en) * | 2013-11-15 | 2015-05-21 | Robert Bosch Gmbh | Method for self-diagnosis of at least one sensor during operation |
CN107211218B (en) | 2014-11-28 | 2021-05-18 | 奥德拉声学公司 | High displacement acoustic transducer system |
US10034109B2 (en) * | 2015-04-09 | 2018-07-24 | Audera Acoustics Inc. | Acoustic transducer systems with position sensing |
CN107846652A (en) * | 2016-09-19 | 2018-03-27 | 西格玛艾尔科技股份有限公司 | Diffuser resonant frequency determines devices and methods therefor |
GB201712391D0 (en) | 2017-08-01 | 2017-09-13 | Turner Michael James | Controller for an electromechanical transducer |
CN108847209A (en) * | 2018-06-01 | 2018-11-20 | 会听声学科技(北京)有限公司 | A kind of denoising device and noise-reduction method |
EP3654041B1 (en) * | 2018-11-16 | 2022-10-19 | Siemens Industry Software NV | Volume acceleration sensor calibration |
CN109552281A (en) * | 2018-12-19 | 2019-04-02 | 浙江零跑科技有限公司 | New energy vehicle electronic parking wheel motor denoising device |
CN114095841A (en) * | 2020-08-25 | 2022-02-25 | 上海艾为电子技术股份有限公司 | Driving device and driving method of loudspeaker and electronic equipment |
NL2027119B1 (en) * | 2020-12-16 | 2022-07-11 | Sonion Nederland Bv | Moveable element for a transducer, transducer, in-ear device and method for determining the occurrence of a condition in a transducer |
JP2024506621A (en) * | 2021-02-15 | 2024-02-14 | エイエムエス-オスラム エイジア パシフィック プライヴェット リミテッド | electroacoustic transducer |
DE112022001084T5 (en) * | 2021-02-15 | 2024-01-18 | Ams-Osram Asia Pacific Pte. Ltd. | ELECTRO-ACUSTIC TRANSDUCER |
Family Cites Families (15)
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DE2538073A1 (en) * | 1975-08-27 | 1977-03-10 | Elektroakustische Geraete H Hi | Drive circuit for loudspeaker - has feedback dependent on difference between membrane movement and input signal |
US6160892A (en) * | 1993-12-30 | 2000-12-12 | Bbn Corporation | Active muffler |
CN1109254A (en) * | 1994-03-23 | 1995-09-27 | 崔基建 | Playback system with dynamic error feedforward |
US6408078B1 (en) * | 1997-10-30 | 2002-06-18 | Maximilian Hobelsberger | Active reactive acoustical elements |
GB2342001B (en) * | 1998-09-21 | 2000-10-25 | Mitsubishi Electric Eng | MFB speaker system with controllable speaker vibration characteristic |
EP1059830A3 (en) * | 1999-05-19 | 2003-12-17 | Faurecia Abgastechnik GmbH | Electrodynamic loudspeaker with a control device for an active vehicle noice attenuator |
US20020159606A1 (en) * | 2001-04-30 | 2002-10-31 | Maximilian Hobelsberger | Electrodynamic transducer with acceleration control |
CA2408045A1 (en) * | 2001-10-16 | 2003-04-16 | Audio Products International Corp. | Loudspeaker with large displacement motional feedback |
US7006639B2 (en) * | 2001-11-20 | 2006-02-28 | Maximilian Hans Hobelsberger | Active noise-attenuating duct element |
US20040086140A1 (en) * | 2002-11-06 | 2004-05-06 | Fedigan Stephen John | Apparatus and method for driving an audio speaker |
US20060104451A1 (en) * | 2003-08-07 | 2006-05-18 | Tymphany Corporation | Audio reproduction system |
US20050031140A1 (en) * | 2003-08-07 | 2005-02-10 | Tymphany Corporation | Position detection of an actuator using a capacitance measurement |
EP1569497A1 (en) * | 2004-02-25 | 2005-08-31 | Harman Becker Automotive Systems GmbH | Motional feedback loudspeaker |
ATE458362T1 (en) * | 2005-12-14 | 2010-03-15 | Harman Becker Automotive Sys | METHOD AND APPARATUS FOR PREDICTING THE BEHAVIOR OF A TRANSDUCER |
DE102011117495B4 (en) * | 2011-11-02 | 2014-08-21 | Eberspächer Exhaust Technology GmbH & Co. KG | Overload protection for loudspeakers in exhaust systems |
-
2012
- 2012-03-23 DE DE102012005893A patent/DE102012005893A1/en not_active Withdrawn
-
2013
- 2013-03-09 US US14/387,144 patent/US20150086027A1/en not_active Abandoned
- 2013-03-09 WO PCT/EP2013/000705 patent/WO2013139445A2/en active Application Filing
- 2013-03-09 CN CN201380015915.3A patent/CN104205873B/en active Active
- 2013-03-09 EP EP13710788.4A patent/EP2829079B1/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
CN104205873B (en) | 2017-09-22 |
US20150086027A1 (en) | 2015-03-26 |
WO2013139445A3 (en) | 2013-11-14 |
WO2013139445A2 (en) | 2013-09-26 |
CN104205873A (en) | 2014-12-10 |
EP2829079A2 (en) | 2015-01-28 |
DE102012005893A1 (en) | 2013-09-26 |
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