EP4386741B1 - Elektromechanische vorrichtung mit variabler resonanzfrequenz und akustische vorrichtung damit - Google Patents

Elektromechanische vorrichtung mit variabler resonanzfrequenz und akustische vorrichtung damit

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Publication number
EP4386741B1
EP4386741B1 EP23215142.3A EP23215142A EP4386741B1 EP 4386741 B1 EP4386741 B1 EP 4386741B1 EP 23215142 A EP23215142 A EP 23215142A EP 4386741 B1 EP4386741 B1 EP 4386741B1
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EP
European Patent Office
Prior art keywords
loudspeaker
frequency
loudspeakers
piezoelectric layer
input port
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EP23215142.3A
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English (en)
French (fr)
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EP4386741A1 (de
Inventor
Romain LIECHTI
Fabrice Casset
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
    • G10K9/125—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means with a plurality of active elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/003—Mems transducers or their use

Definitions

  • the technical field of the invention is that of microsystems, in particular microsystems for acoustic applications.
  • the present invention relates to an electromechanical device and, in particular, to an electromechanical device whose resonant frequency can be modulated.
  • the present invention also relates to an acoustic device making use of an electromechanical device according to the invention.
  • a good loudspeaker is one that reproduces all frequencies in the audio band (20 Hz to 20 kHz) at the same amplitude, with low distortion.
  • the lowest frequency at which a loudspeaker effectively produces sound is determined by the resonant frequency of the mechanical-acoustic transducer.
  • the diaphragm guide system is more rigid and the mass of the diaphragm is lower, which increases the resonant frequency of the system and therefore reduces its bandwidth.
  • a hermetic cavity is required to avoid destructive interference between the front and rear acoustic waves of the loudspeaker. This hermetic cavity increases the apparent stiffness of the system and therefore its resonant frequency, thus reducing its bandwidth.
  • the pressure level radiated by a loudspeaker depends on the volume of air accelerated by the loudspeaker. This accelerated air volume depends on the product of the surface area and the maximum displacement of the membrane. In a context of miniaturization, the surface area of the membrane is greatly reduced, and a large displacement is therefore necessary to obtain a satisfactory pressure level.
  • piezoelectric transduction Another means of transduction showing notable performances is piezoelectric transduction.
  • piezoelectric transduction has the advantage of being compatible with micro-fabrication processes. For example, it is possible to use the bimetallic effect and an actuator positioned on a membrane in order to obtain relatively large displacements. However, this is not the only possible configuration.
  • the piezoelectric actuators are offset from the membrane, this solution making it possible to produce a "pistonic" movement of the membrane (see for example the patent US9980051B2 ).
  • the document FR3000354 refers to a piezoelectric type loudspeaker, comprising a membrane whose movement is controlled.
  • Fig. 1 shows the frequency response of a MEMS loudspeaker, with and without a 100 mm 3 rear cavity. Increasing the resonant frequency removes much of the radiated pressure in the low frequencies.
  • an electromechanical device whose frequency can be varied, and in particular lowered, according to requirements.
  • an acoustic device equipped with such an electromechanical device so as to have a loudspeaker whose resonant frequency can vary, thus making it possible to reproduce all the frequencies of the audio band with substantially the same amplitude, with a low distortion rate, the loudspeaker being also compatible with micro-manufacturing techniques.
  • the invention provides a solution to the problems mentioned above by proposing an electromechanical device whose frequency can be varied, and in particular lowered, as required.
  • the invention also provides an acoustic device using such an electromechanical device and in which the resonant frequency of the loudspeaker(s) adapts to the frequency or frequencies of the acoustic signal emitted by said loudspeaker(s).
  • the electromechanical device according to the invention is remarkable in that it comprises an electrical circuit connected to the second piezoelectric layer in parallel with the capacitance formed by said second layer and comprising an adjustable capacitance which can take a negative value.
  • the invention it is possible to vary the resonance frequency of the moving element(s) (and therefore of the moving mechanical structure) by varying the value of the adjustable capacitance.
  • the electromechanical device according to a first aspect of the invention may have one or more complementary characteristics among the following, considered individually or according to all technically possible combinations.
  • the adjustable capacitance capable of taking a negative value is achieved using an operational amplifier.
  • the adjustable capacitance capable of taking a negative value is produced by micro-fabrication.
  • the movable mechanical structure consists of a movable mechanical element in the form of a disc-shaped membrane, the first piezoelectric layer and the second piezoelectric layer being arranged on the surface of said membrane.
  • the mobile mechanical structure comprises a rigid surface configured to be able to perform a translational movement perpendicular to its surface, the mobile mechanical element(s) of the mobile mechanical structure being configured to actuate the rigid surface according to said movement.
  • each movable mechanical element is made using a beam embedded at one of its ends and guided, the first piezoelectric layer being disposed on a first portion of an upper surface of the beam and the second piezoelectric layer being disposed on a second portion of the upper surface of the beam.
  • each movable element is made using a beam embedded at its two ends.
  • the resonant frequency of the loudspeaker is adjustable around the resting frequency of said loudspeaker and the digital signal processing means is configured to send the instantaneous frequency of the signal to the loudspeaker, the latter being configured to adjust its resonant frequency to the instantaneous frequency of the audio electrical signal received on the input port.
  • Audio electrical signal means an electrical signal corresponding to an electrical signal intended to be converted into an audio signal by one or more loudspeakers.
  • the acoustic device according to a second aspect of the invention may have one or more complementary characteristics among the following, considered individually or according to all technically possible combinations.
  • the acoustic device comprises a bandpass filter configured to isolate, in the audio electrical signal received on the input port, the audio electrical signal at a predetermined frequency, the electrical signal at the output of the bandpass filter being sent to the loudspeaker, the bandpass filter being configured to adjust its predetermined frequency to the instantaneous frequency of the signal received on the input port and determined by the digital signal processing means.
  • the resonant frequency of each loudspeaker of the plurality of loudspeakers is adjustable around the resting resonant frequency of the loudspeaker considered in a predetermined frequency range
  • the means for processing a digital signal is configured to send, to each loudspeaker of the plurality of loudspeakers, the instantaneous frequency of the signal received on the input port having the highest amplitude in the predetermined frequency range associated with the loudspeaker considered, the latter being configured to adjust its resonant frequency to this instantaneous frequency
  • the bandpass filter associated with the loudspeaker considered being configured to adjust its predetermined frequency to this same instantaneous frequency.
  • the acoustic device according to a third aspect of the invention may have one or more complementary characteristics among the following, considered individually or according to all technically possible combinations.
  • the quiescent resonant frequencies of the plurality of speakers are distributed based on the harmonics of a string instrument.
  • a first aspect of the invention illustrated in [ Fig. 2 ] has [ Fig. 7 ] relates to an electromechanical device comprising at least one mobile mechanical structure SM (hereinafter mobile structure), said mobile structure SM comprising at least one mobile mechanical element EM (hereinafter mobile element) and, for each of these mobile elements EM, a first piezoelectric layer CP1, said first layer CP1 being arranged on a first part of the mobile element EM so as to be able to actuate said mobile element EM, and a second piezoelectric layer CP2, said second layer CP2 being arranged on a second part of the mobile element EM, distinct from the first part, so as to be able to convert the mechanical energy associated with the movement of the mobile element EM into electrical energy (thus the first layer CP1 and the second layer CP2 are separated from each other), the second layer CP2 forming a capacitance.
  • mobile structure comprising at least one mobile mechanical element EM (hereinafter mobile element) and, for each of these mobile
  • the electromechanical device according to the invention is remarkable in that it comprises an electrical circuit CEL connected to the second piezoelectric layer CP2, said electrical circuit comprising an adjustable capacitance which can take a negative value. Furthermore, this adjustable capacitance is in parallel with the capacitance formed by the second piezoelectric layer CP2 so that the equivalent capacitance can take a positive or a negative value as required.
  • a piezoelectric layer CP1, CP2 acts as a transducer. Also, the electrical components connected to such a layer have an influence on the mechanical behavior of the mobile element EM on which said piezoelectric layer CP1, CP2 is deposited.
  • the electromechanical structure according to the invention is represented by an equivalent electrical circuit comprising a series resistor R g representing the output resistance of the amplifier (responsible for actuating the mobile element EM), a capacitor C pa representing the capacitive effect of the first piezoelectric layer CP1, a transformer ⁇ a representing the electromechanical transduction of the first piezoelectric layer CP1 (in other words, representing the conversion of the electrical energy supplied by the amplifier into mechanical energy of the mobile element EM), a resistor R ms representing the viscous losses in the mechanical domain undergone by the mobile element EM, an inductance M ms representing the mobile mass of the mobile element EM, a capacitance C ms representing the apparent stiffness of the mobile element EM relative to the fixing point or points of said mobile element EM, a transformer S d representing the mechano-acoustic transduction, an im
  • the resonance frequency of the mobile element EM by playing on the negative value of the capacitance C n as shown in [ Fig. 3 ].
  • the frequency response of the EM mobile element is represented for different values of C ps + C n located between -1nF and -10nF.
  • the values of the capacitances are chosen so that the resonance frequency can be varied in a range of +/- 20% around the resonance frequency at rest (corresponding to the situation in which the CEL circuit in parallel with the capacitance formed by the second layer is open).
  • the adjustable capacity is achieved using an operational amplifier.
  • R 1 , R 2 and C n ′ take positive values, at least one of which may vary.
  • the value of C n ′ can be varied.
  • the mobile structure SM according to the invention can adopt different configurations depending on the intended use.
  • the mobile structure SM consists of a mobile element EM in the form of a disc-shaped membrane, the first piezoelectric layer CP1 and the second piezoelectric layer CP2 being arranged on the surface of said membrane.
  • the diameter of the disc-shaped membrane is between 1 mm and 25 mm.
  • the first piezoelectric layer CP1 is located in a part of the surface of the membrane separated from the part of the surface of the membrane where the second piezoelectric layer CP2 is located, the separation between the two parts being at the level of the inflection of the membrane (in a section along the diameter of the latter), generally at 2/3 of the radius from the center of the membrane.
  • the first piezoelectric layer CP1 forms a disc in the center of the membrane and the second piezoelectric layer CP2 forms a ring around this disc.
  • the first layer CP1 forms a first ring and the second layer CP2 forms a second ring surrounding the first ring.
  • the mobile structure SM comprises a rigid surface SR configured to be able to perform a translational movement perpendicular to its surface (movement represented by the dotted arrow in the figure), the mobile element(s) EM of the structure SM being configured to actuate the rigid surface SR according to said movement.
  • the equivalent electrical diagram and the operating principle remain the same as in the case introduced previously: the influence of the second piezoelectric layer CP2 present on each mobile element EM makes it possible to modify the resonance frequency of the mobile structure SM as a whole.
  • each mobile element EM is produced using a beam embedded at one of its ends at a frame CR and guided (taking into account the symmetry of the structure), the first piezoelectric layer CP1 being arranged on a first part of an upper surface of the beam and the second piezoelectric layer CP2 being arranged on a second part of the upper surface of the beam, distinct from the first part.
  • the boundary between the first part and the second part is located at an inflection point of the beam (when the latter is set in motion). In the example of the [ Fig. 7 ], taking into account the symmetry of the beam, this boundary is located at mid-length of the beam, that is to say at a distance L/2 from one end of the beam, L being the length of the beam.
  • each movable element is made using a beam embedded at its two ends.
  • An electromechanical device can advantageously be used to produce a HP loudspeaker whose resonant frequency is variable, the resonant frequency of the loudspeaker being given by the frequency of the electromechanical device of said loudspeaker.
  • each HP loudspeaker comprises a mobile structure SM produced using a membrane such that presented to the [ Fig. 5A ] or to the [ Fig. 5B ].
  • each loudspeaker HP comprises a control circuit configured to determine, from a set frequency, the value of the negative capacitance making it possible to obtain a resonance frequency equal to the set frequency, the control circuit being further configured to control the electrical circuit CEL of the electromechanical device according to the invention in order to obtain the value of the capacitance (and therefore the resonance frequency) desired.
  • the control circuit is configured to determine the movement of the loudspeaker using the second piezoelectric layer CP2 and, from this movement, the vibration frequency of the loudspeaker.
  • Acoustic device comprising an electromechanical device with variable resonant frequency
  • the resonant frequency of the HP loudspeaker is adjustable around the resting frequency of said HP loudspeaker and the digital signal processing means MT is configured to send the instantaneous frequency of the signal to the HP loudspeaker, the latter being configured to, from this instantaneous frequency, adjust its resonant frequency.
  • the DA acoustic device according to the invention can, for example, be integrated into a mobile phone, a tablet or any other equipment requiring small speakers and/or speakers requiring the reproduction of only a single frequency, although variable over time (e.g. a buzzer in an electronic device).
  • the loudspeaker being produced using an electromechanical device DE according to a first aspect of the invention, it is possible to control the frequency of the latter via the electrical circuit CEL of the electromechanical device DE and measure the movement of the loudspeaker HP (and possibly, from this movement, deduce the vibration frequency) and to control the variable capacitance in order to adjust the resonance frequency of the loudspeaker HP.
  • the acoustic device DA comprises a bandpass filter FPB configured to isolate, in the audio electrical signal received on the input port IN, the audio electrical signal at a predetermined frequency, the filtered electrical signal at the output of the filter being sent to the loudspeaker HP.
  • the predetermined frequency of the bandpass filter FPB is adjusted according to the instantaneous frequency of the audio electrical signal received on the input port IN.
  • the bandpass filter FPB makes it possible to filter out the parasitic signals in order to send to the loudspeaker HP only the signal at the instantaneous frequency of the input signal, the latter being moreover the resonance frequency of the loudspeaker HP.
  • the predefined frequency of the bandpass filter FPB and the resonance frequency of the loudspeaker HP are slaved to the instantaneous frequency of the input signal.
  • the instantaneous frequency of the input electrical audio signal is determined using a Short-Time Fourier Transform (STFT).
  • STFT Short-Time Fourier Transform
  • Other methods well known to those skilled in the art may be used, such as a Hilbert Transform or a derivative of the phase as a function of time.
  • the acoustic device DA is configured to emit only a single frequency, the instantaneous frequency of the input signal (this frequency may however vary over time). It may however be interesting to be able to emit in a plurality of frequencies, for example to reproduce the sound emitted by a string instrument or to vary the tones of a buzzer.
  • the acoustic device DA according to the invention is remarkable in that the resonance frequency of each HP loudspeaker of the plurality of HP loudspeakers is adjustable around the resting resonance frequency of the HP loudspeaker considered in a predetermined frequency range, and in that the digital signal processing means MT is configured to send, to each HP loudspeaker of the plurality of HP loudspeakers, the instantaneous frequency of the signal received on the input port IN having the highest amplitude in the predetermined frequency range associated with the HP loudspeaker considered, said HP loudspeaker being configured to adjust its resonance frequency to this instantaneous frequency. Furthermore, the bandpass filter FPB associated with the HP loudspeaker considered is configured to adjust its predetermined frequency to this same frequency. instantaneous.
  • the frequency associated with the greatest signal amplitude is the one on which the control of the resonance frequency of the HP loudspeaker and the predefined frequency of the FPB bandpass filter will take place.
  • each HP loudspeaker of the plurality of HP loudspeakers is associated with a resting resonance frequency, different from the resting resonance frequency of the other HP loudspeakers.
  • each HP loudspeaker of the plurality of HP loudspeakers is adjustable around the resting resonance frequency of the HP loudspeaker considered in a predetermined frequency range (this frequency range therefore defining a frequency band).
  • the [ Fig. 11 ] represents the frequency response of eight HP loudspeakers, each curve being associated with one HP loudspeaker, each peak corresponding to the speaker's resting resonant frequency, the gray band surrounding each of the peaks representing the frequency band of the loudspeaker in which the resonant frequency can be adjusted.
  • the quiescent resonant frequencies of the plurality of HP speakers are distributed according to the harmonics of a string instrument, e.g., a guitar, a piano, etc.
  • a string instrument e.g., a guitar, a piano, etc.
  • [ Fig. 12 ] which represents the amplitude of the signal in time/frequency

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (13)

  1. Elektromechanische Vorrichtung, umfassend:
    - Mindestens eine bewegliche mechanische Struktur, die mindestens ein bewegliches mechanisches Element (EM) umfasst;
    - Für jedes bewegliche mechanische Element (EM) jeder beweglichen mechanischen Struktur (SM):
    ∘ eine erste piezoelektrische Schicht (CP1), wobei die erste Schicht (CP1) auf einem ersten Teil des beweglichen Elements (EM) angeordnet ist, so dass das bewegliche mechanische Element (EM) betätigt werden kann;
    ∘ eine zweite piezoelektrische Schicht (CP2), wobei die zweite Schicht (CP2) auf einem zweiten Teil des beweglichen Elements (EM) angeordnet ist, der sich von dem ersten Teil unterscheidet, so dass sie die mechanische Energie, die mit der Bewegung des beweglichen mechanischen Elements (EM) verbunden ist, in elektrische Energie umwandeln kann, wobei die Schicht eine Kapazität bildet;
    wobei die Vorrichtung dadurch gekennzeichnet ist, dass sie einen elektrischen Schaltkreis umfasst, der mit der zweiten piezoelektrischen Schicht (CP2) parallel zu der von der Schicht (CP2) gebildeten Kapazität verbunden ist und eine einstellbare Kapazität aufweist, die einen negativen Wert annehmen kann.
  2. Vorrichtung nach dem vorhergehenden Anspruch, bei der die einstellbare Kapazität, die einen negativen Wert annehmen kann, mithilfe eines Operationsverstärkers realisiert wird.
  3. Vorrichtung nach Anspruch 1, bei der die einstellbare Kapazität, die einen negativen Wert annehmen kann, durch Mikrofertigung hergestellt wird.
  4. Vorrichtung nach einem der drei vorhergehenden Ansprüche, bei der die bewegliche mechanische Struktur (SM) aus einem beweglichen Element (EM) in Form einer scheibenförmigen Membran besteht, wobei die erste piezoelektrische Schicht (CP1) und die zweite piezoelektrische Schicht (CP2) an der Oberfläche dieser Membran angeordnet sind.
  5. Vorrichtung nach dem vorhergehenden Anspruch, bei der die erste piezoelektrische Schicht (CP1) einen ersten Ring bildet und die zweite piezoelektrische Schicht (CP2) einen zweiten Ring bildet, der den ersten Ring umgibt.
  6. Vorrichtung nach Anspruch 1, Anspruch 2 oder Anspruch 3, bei der die bewegliche mechanische Struktur (SM) eine starre Oberfläche (SR) umfasst, die so gestaltet ist, dass sie eine Translationsbewegung senkrecht zu ihrer Oberfläche ausführen kann, wobei das oder die beweglichen mechanischen Elemente (EM) der beweglichen mechanischen Struktur (SM) so gestaltet sind, dass sie die starre Oberfläche (SR) gemäß dieser Bewegung betätigen.
  7. Vorrichtung nach dem vorhergehenden Anspruch, bei der jedes bewegliche Element (EM) mithilfe eines an einem seiner Enden eingebetteten und geführten Balkens hergestellt ist, wobei die erste piezoelektrische Schicht (CP1) auf einem ersten Teil einer oberen Oberfläche des Balkens angeordnet ist und die zweite piezoelektrische Schicht (CP2) auf einem zweiten Teil der oberen Oberfläche des Balkens angeordnet ist, der sich von dem ersten Teil unterscheidet.
  8. Vorrichtung nach Anspruch 6, bei der jedes bewegliche mechanische Element (EM) mithilfe eines an seinen beiden Enden eingebetteten Trägers hergestellt wird.
  9. Lautsprecher mit mindestens einer Vorrichtung nach einem der vorhergehenden Ansprüche.
  10. Akustische Vorrichtung (DA), umfassend:
    - Einen Eingangsanschluss (IN) zum Empfang eines elektrischen Audiosignals;
    - Einen Lautsprecher (HP) nach dem vorhergehenden Anspruch, wobei der Lautsprecher mit einer Ruhe-Resonanzfrequenz verbunden ist und ein Messmittel (CP2) umfasst, das ausgebildet ist, um die Bewegung des Lautsprechers (HP) zu messen;
    - Eine digitale Signalverarbeitungseinrichtung (MT), die so gestaltet ist, dass sie die momentane Frequenz des elektrischen Audiosignals bestimmt, das über den Eingangsanschluss (IN) empfangen wird;
    wobei die Vorrichtung dadurch gekennzeichnet ist, dass die Resonanzfrequenz des Lautsprechers (HP) um die Ruhefrequenz des Lautsprechers (HP) einstellbar ist und die digitale Signalverarbeitungseinrichtung (MT) so gestaltet ist, dass sie die momentane Frequenz des Signals an den Lautsprecher (HP) sendet, wobei der Lautsprecher (HP) so gestaltet ist, dass er ausgehend von dieser momentanen Frequenz seine Resonanzfrequenz einstellt.
  11. Akustische Vorrichtung (DA) nach dem vorhergehenden Anspruch, die ein Bandpassfilter (FPB) umfasst, das so gestaltet ist, dass es in dem am Eingangsanschluss (IN) empfangenen elektrischen Audiosignal das elektrische Audiosignal mit einer vorbestimmten Frequenz isoliert, wobei das elektrische Signal am Ausgang des Bandpassfilters (FPB) dem Lautsprecher (HP) zugeführt wird, wobei das Bandpassfilter (FPB) so gestaltet ist, dass es seine vorbestimmte Frequenz an die momentane Frequenz des am Eingangsanschluss (IN) empfangenen elektrischen Audiosignals anpasst.
  12. Akustische Vorrichtung (DA), umfassend:
    - Einen Eingangsanschluss (IN) zum Empfang eines elektrischen Audiosignals;
    - Eine Vielzahl von Lautsprechern (HP) nach Anspruch 9, wobei jeder Lautsprecher (HP) der Vielzahl von Lautsprechern (HP) mit einer Ruhe-Resonanzfrequenz verbunden ist, die sich von der Ruhe-Resonanzfrequenz der anderen Lautsprecher (HP) unterscheidet, und eine Messeinrichtung (CP2) umfasst, die so gestaltet ist, dass sie die Bewegung des betreffenden Lautsprechers (HP) misst;
    - Eine digitale Signalverarbeitungseinrichtung (MT), die so gestaltet ist, dass sie den Frequenzinhalt des elektrischen Audiosignals bestimmt, das über den Eingangsanschluss (IN) empfangen wird;
    - Für jeden Lautsprecher (HP) der Vielzahl von Lautsprechern (HP) ein Bandpassfilter (FPB), das so gestaltet ist, dass es in dem am Eingangsanschluss (IN) empfangenen elektrischen Audiosignal das elektrische Audiosignal mit einer vorbestimmten Frequenz isoliert, wobei das elektrische Signal am Ausgang des Bandpassfilters (FPB) dem betreffenden Lautsprecher (HP) zugeführt wird;
    wobei die Vorrichtung (DA) dadurch gekennzeichnet ist, dass die Resonanzfrequenz jedes Lautsprechers (HP) der Vielzahl von Lautsprechern (HP) um die Ruhe-Resonanzfrequenz des betreffenden Lautsprechers (HP) innerhalb eines vorbestimmten Frequenzbereichs einstellbar ist, und die digitale Signalverarbeitungseinrichtung (MT) so gestaltet ist, dass sie an jeden Lautsprecher (HP) der Vielzahl von Lautsprechern die momentane Frequenz des am Eingangsanschluss (IN) empfangenen Signals mit der höchsten Amplitude innerhalb des dem betreffenden Lautsprecher (HP) zugeordneten vorbestimmten Frequenzbereichs überträgt, wobei der Lautsprecher (HP) so gestaltet ist, dass er seine Resonanzfrequenz an diese momentane Frequenz anpasst, wobei das dem betreffenden Lautsprecher (HP) zugeordnete Bandpassfilter (FPB) so gestaltet ist, dass es seine vorbestimmte Frequenz an dieselbe momentane Frequenz anpasst.
  13. Vorrichtung (DA) nach dem vorhergehenden Anspruch, bei der die Ruhe-Resonanzfrequenzen der Lautsprecher (HP) der Vielzahl von Lautsprechern (HP) entsprechend den Obertönen eines Saiteninstruments verteilt sind.
EP23215142.3A 2022-12-12 2023-12-08 Elektromechanische vorrichtung mit variabler resonanzfrequenz und akustische vorrichtung damit Active EP4386741B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2213178A FR3143170B1 (fr) 2022-12-12 2022-12-12 Dispositif électromécanique à fréquence de résonance variable et dispositif acoustique associé

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EP4386741A1 EP4386741A1 (de) 2024-06-19
EP4386741B1 true EP4386741B1 (de) 2025-09-03

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US (1) US12470876B2 (de)
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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8520869B2 (en) * 2010-03-29 2013-08-27 Panasonic Corporation Piezoelectric acoustic transducer
FR3000354B1 (fr) * 2012-12-20 2015-01-30 Commissariat Energie Atomique Dispositif a membrane a deplacement controle
DE102014106753B4 (de) 2014-05-14 2022-08-11 USound GmbH MEMS-Lautsprecher mit Aktuatorstruktur und davon beabstandeter Membran

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FR3143170A1 (fr) 2024-06-14
US12470876B2 (en) 2025-11-11
EP4386741A1 (de) 2024-06-19
US20240196136A1 (en) 2024-06-13
FR3143170B1 (fr) 2024-11-29

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