EP2839676B1 - Verfahren und vorrichtung zur regelung der betriebstemperatur eines lautsprechers - Google Patents

Verfahren und vorrichtung zur regelung der betriebstemperatur eines lautsprechers Download PDF

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Publication number
EP2839676B1
EP2839676B1 EP13716782.1A EP13716782A EP2839676B1 EP 2839676 B1 EP2839676 B1 EP 2839676B1 EP 13716782 A EP13716782 A EP 13716782A EP 2839676 B1 EP2839676 B1 EP 2839676B1
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EP
European Patent Office
Prior art keywords
loudspeaker
signal
power
impedance
excitation signal
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EP13716782.1A
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English (en)
French (fr)
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EP2839676A1 (de
Inventor
Ivan Bourmeyster
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Arkamys SA
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Arkamys SA
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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
    • 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
    • H04R29/003—Monitoring arrangements; Testing arrangements for loudspeakers of the moving-coil type
    • 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
    • H04R3/007—Protection circuits for transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the invention relates to a method and a device for controlling the operating temperature of a loudspeaker.
  • the invention is more particularly, but not exclusively, adapted to the field of electrodynamic loudspeakers for mobile phones.
  • the coil (130) and magnet (120) assembly constitutes a motor.
  • a periodic electric signal called the excitation signal
  • this motor transforms the electrical energy into mechanical energy, in the form of vibrations, which vibrations are transmitted to the membrane (140), which vibrates, produces fluctuations in air pressure, that is to say a sound.
  • the efficiency of this engine is not perfect, a portion of the electrical energy of the excitation signal is converted into heat, especially Joule effect.
  • This heat increases the temperature of the loudspeaker and leads, when said temperature reaches critical levels, to a distortion of the sound emitted, by the modification of the electromagnetic characteristics of the engine, the thermal expansion of the materials and the loss of linearity in the electromechanical transformation. excitation signal. This heating may even result in the irreversible degradation of the loudspeaker, for example, by the breaking of the constituent wire the turns of the coil.
  • the document EP 2369852 discloses a power management system for an audio system, comprising: a parameter computer configured to develop an estimated operational characteristic of a loudspeaker based on a measured actual parameter of an audio signal driving the loudspeaker; speaker, a threshold comparator in communication with the parameter computer, the threshold comparator being configured to develop and monitor a threshold based on the actual parameter measured and the estimated operational characteristic, and a limiter in communication with the comparator of threshold, the limiter being positioned between an audio source providing the audio signal and the loudspeaker upon receiving the audio signal, the limiter being configured to selectively adjust the audio signal according to the threshold.
  • the invention aims to solve the disadvantages of the prior art and for this purpose concerns a method according to claim 1 for controlling the temperature of an electrodynamic loudspeaker.
  • the method that is the subject of the invention makes it possible to determine the temperature of the loudspeaker without using a specific probe, and without increasing the size of said loudspeaker.
  • the invention can be implemented according to the advantageous embodiments described below, which can be considered individually or in any technically operative combination.
  • the temperature of said speaker can be controlled during its operation.
  • the method according to the invention allows, according to this embodiment, to provide for the heating of the loudspeaker when it is in operation.
  • the method according to the invention makes it possible to protect the loudspeaker against overheating by acting directly on the excitation signal, without integrating additional cooling device.
  • the method that is the subject of the invention makes it possible, by analyzing the signal in the same frequency band as for measuring the temperature, to mechanically protect the membrane of the loudspeaker.
  • the attenuation of the excitation signal is realized only when necessary in order to avoid “pumping” phenomena, that is to say close fluctuations in the sound level or the audio spectrum of the sound emitted from above. loudspeaker.
  • the selective action of the method that is the subject of the invention limits the audible effect of the thermal and mechanical protections on the sound emitted by the loudspeaker. Updating the characteristics of the filters makes it possible to adapt the protection and its effect to the real risk.
  • the excitation signal is a digital signal converted into an analog signal to excite the loudspeaker motor and the filters of steps o) and p) are digital filters applied to the excitation signal before it is converted into an analog signal.
  • the characteristics of the filtering can be adapted very precisely to obtain the mechanical and thermal protection of the speaker by limiting the audible effect of these filters on the sound emitted by the loudspeaker.
  • the predefined frequency range of step c) is between 300 Hz and 1000 Hz.
  • the Applicant has determined that the impedance peaks in this frequency range are particularly correlated with the speaker temperature. .
  • ⁇ t is equal to 5.10 -3 seconds. This delay is at the same time sufficient to carry out the calculations necessary for the analysis of the signals and sufficiently short to realize the thermal and mechanical protections of the loudspeaker without it being necessary to significantly reduce the power of the excitation signal. that is, without degrading too much the excitation signal and hence the sound.
  • the frequency range framing the thermal band is centered on a frequency of 3.10 3 Hz.
  • This frequency of 3 kHz is greater than the the majority of the human voice, the attenuation of the signal power in this frequency band thus makes it possible to effectively limit the heating of the loudspeaker without degrading the sound volume felt by the listener, particularly in the case of a loudspeaker. application on mobile phone in conference mode.
  • the spectral distribution of the impedance is obtained in step a) of the method that is the subject of the invention, by measuring a transfer function between a signal proportional to the current of the analog excitation signal of the loudspeaker. and the delayed digital excitation signal of said loudspeaker.
  • the method can be implemented easily on any device comprising a digital audio source, by adapting the delay time, without significant branch on the speaker side.
  • the device of the invention can be easily adapted to a device without significant modification.
  • the invention also relates to a sound diffusion apparatus, in particular a mobile telephone, comprising a loudspeaker, which apparatus comprises a device according to one of the embodiments of the invention.
  • the apparatus forming the subject of the invention comprises means capable of implementing a mode of over-amplification of the sound diffusion and means able to implement a method of attenuation of the excitation signal according to one of the embodiments of the method which is the subject of the invention, when said over-amplification mode is selected.
  • the apparatus of the invention can be used at a high volume without risk of overheating.
  • FIG. 2 according to an exemplary embodiment of the device (200) object of the invention, it is inserted into the audio processing chain of an apparatus such as a telephone.
  • the device according to the invention receives as input a digital signal (211) coming from an audio source, and outputs a digital signal (212) that has been processed according to one of the embodiment of the method which is the subject of the invention.
  • This digital signal (212) at the output of the device (200) which is the subject of the invention is amplified and converted into a signal (221) for excitation of the loudspeaker (100) by a module (220) for converting and amplification according to a method known from the prior art.
  • the device according to the invention comprises means (230) for measuring the spectral distribution of the impedance of the loudspeaker (100), a computer (240), and a means (250) for processing the signal.
  • the computer (240) is able to modify the characteristics of the processing performed by the signal processing means (250) on the signal (211) introduced into the device that is the subject of the invention.
  • the means (230) for measuring the spectral distribution of the impedance comprises a measurement resistor (331) connected in series with the loudspeaker (100) at the output of the module (220) conversion and amplification. Said measurement resistor (331) is thus traversed by the excitation signal (221). The resistance value of this resistance (331) measurement is low, of the order of 50 to 100 times lower than the speaker impedance (100). Thus for a loudspeaker (100) whose electrical impedance is of the order of 8 ohms, the impedance of the resistor (331) measurement is chosen to be of the order of 0.1 Ohm.
  • Said spectral distribution measuring means (230) comprises a module (332) voltmeter, connected in shunt across the resistor (331) measurement, and delivering a signal (340) proportional to the voltage across said resistor ( 331), ie proportional to the intensity of the loudspeaker excitation signal (221), which intensity is a function of the electrical impedance of said loudspeaker (100).
  • the signal (340) from the module (332) voltmeter is amplified by a low noise amplifier (333) and converted by an analog / digital converter (334) into a digital signal (341).
  • FIG. 4A according to an exemplary embodiment of the computer (240) of the device according to the invention, the latter comprises a processor, memory means for storing data and instruction programs of the processor for performing calculations as well as input and output ports and a clock.
  • the digital signal (341) from the analog / digital converter (334) is introduced into said computer (240), which computer comprises a spectral analysis program (441).
  • the digital excitation signal (212) of the loudspeaker is delayed by a delay module (440) and the delayed signal (412) is also inputted to the spectral analysis program (441). .
  • the delay applied by the delay module (440) to the digital excitation signal (212) of the loudspeaker makes it possible to compensate the processing time of the excitation signal (221) until the delivery of the digital signal (341) from the measurement module of the spectral distribution.
  • the spectral analysis program (441) determines the transfer function of the loudspeaker from the ratio of the two signals (341, 412) at the input of said program and delivers information corresponding to the spectral distribution of the electrical impedance of the loudspeaker. speaker.
  • the time delay applied by the delay module (440) is adjusted to the application.
  • the device of the invention makes it possible, by a simple method, a limited number of components and without significant intervention on the audio circuit, to obtain, in real time, the spectral distribution of the electrical impedance of the loudspeaker.
  • a program (442) included in the computer memory determines, from the spectral distribution provided by the spectral analysis program (441), the position of the center frequency Fc 1 and the half-height width, l 1 , an impedance peak, in a frequency range comprised, according to an exemplary embodiment, between 300 Hz and 1000 Hz.
  • a comparison program (444) compares the position of the center frequency Fc 1 of the last impedance peak recorded at time t 1 with the position of the center frequency Fc 0 of the impedance peak in the previous record. at time t 0 in the same frequency range. Said program (444) delivers information, for example the quantity (Fc 1 -Fc 0 ), relative to the impedance peak displacement.
  • a correlation program (445) determines the temperature, T, of the loudspeaker, at time t 1 of the recording, by reading a correlation table connecting the impedance peak displacement and the temperature of the speaker. Said correlation table is read by said program (445) in a memory (446), called a characteristics memory, accessible in read-only mode, preferably of type ROM (according to the acronym for " Read Only Memory” ) or EPROM ( according to the English acronym of " Erasable Programmable Read Only Memory ”) and having a record of the correlation table for the speaker model considered.
  • Figure 4B according to an exemplary behavior of the loudspeaker, when the temperature of said loudspeaker increases, the spectral distribution of the impedance at time t 1 is plotted (471) in a diagram having on the abscissa the frequency (480) and the ordinate impedance (490), a peak centered on a frequency Fc 1 , which frequency Fc 1 is greater than the center frequency Fc 0 of the peak detected in the plot (470) of the impedance at time t 0 prior to t 1 .
  • the center frequency of the peak impedance goes from 800 Hz to 400 Hz when the temperature of the speaker passes 70 ° C to 120 ° C .
  • the signal processing means (250) is a program implemented by the computer (240) and which performs a digital filtering of the audio signal (211).
  • the filtering comprises a low-pass filter, a band-cut filter or a single-band or multi-band band rejection filter.
  • the filter applied to the audio signal is a low-pass filter whose Bode diagram (570) in a logarithmic reference with the abscissa frequency (580) and the ordinate (590) the gain, comprises a band pass (571) and a rejected band (572) beyond a cut-off frequency (575) corresponding to an attenuation of -3 dB relative to the gain of the pass-through portion.
  • said cut-off frequency (575) is chosen in the upper part of the spectrum of the speech signal, which is greater than or equal to 3.10 3 Hz for a high used to essentially broadcast conversations.
  • the attenuation of the filter is -6 dB / octave.
  • the parameter adjusted as a function of the temperature of the loudspeaker is, on the one hand, the application of the filter to the signal, cutting frequencies above 3.10 3 Hz essentially affecting the tone of the voice without affecting the volume felt by the listener, while reducing the signal excitation power, then the gain in the bandwidth (571) of the filter, this gain then being adjusted to a value less than 0 dB.
  • the filter applied is a band rejection filter.
  • the plot (577) of the Bode diagram of such a filter has attenuation centered on a frequency (576) characterized by a bandwidth l f about this center frequency (576) at -3 dB relative to the gain in the bandwidth.
  • the adjustable parameters of such a filter are the gain in the pass-through portion, the center frequency (576) of the rejected band, and the bandwidth 1 f around this center frequency.
  • the digital filtering of the signal makes it possible to combine the different types of filters according to the desired result in order to minimize the audible degradation of the sound emitted by the loudspeaker.
  • the appropriate filter combination is determined experimentally or by simulation.
  • Figure 6 according to an exemplary embodiment of the method which is the subject of the invention, implemented by a device as described above, said method comprises a first measurement step (610) of obtaining the spectral distribution of the electrical impedance of the speaker, preferably in a frequency range between 300 Hz and 1000 Hz.
  • an identification step (620) an impedance peak, centered on a frequency Fc 1 , is identified in the spectral distribution obtained during of step (610) of measurement.
  • a comparison step (630) the position of the center frequency Fc 1 of said peak is compared with the position of the center frequency Fc 0 of the impedance peak in the spectral distribution obtained at an earlier date t 0 .
  • a stability control step (635) the difference ⁇ Fc 1 - Fc 0 ⁇ is compared with a criterion of stability F stab .
  • the subsequent stages of signal processing are implemented only if the heating of the loudspeaker is proven.
  • the difference (Fc 1 -Fc 0 ) is correlated with the temperature T of the loudspeaker, thus determining the temperature of said loudspeaker at time t 1 .
  • a signal analysis step (650) the spectral distribution of the power of the excitation signal is obtained.
  • said spectral power distribution of the excitation signal is used to provide heating, ⁇ T, the speaker at time (t 1 + ⁇ ) with ⁇ ⁇ ⁇ t.
  • a thermal risk analysis step (665) the quantity ( T + ⁇ T ) is compared with a critical temperature Tc. If (T + ⁇ T ) ⁇ Tc then a filter aimed at reducing the power of the excitation signal according to a selected frequency spectrum is calculated during a parameterization step (670).
  • a step (680) of mechanical analysis the power of the excitation signal in a frequency band centered on Fc 1 according to a bandwidth 11 is analyzed.
  • the power determined during the mechanical analysis step is compared to a critical value defining a risk of displacement of the speaker diaphragm out of its allowable mechanical travel . If the power determined during the step (680) of mechanical analysis is greater than the allowable power, then the characteristics of a band rejection filter, centered on the frequency Fc 1 and in a bandwidth, called mechanical band, corresponding to l 1 are calculated during a step (690) of mechanical parameterization.
  • the filters calculated during the mechanical and thermal parameterization steps (670, 690) are applied to the signal during a filtering step (695).
  • the invention achieves the desired objectives, in particular, it makes it possible, particularly in the context of a mobile phone application, to protect the loudspeaker of said telephone when it is used in over-amplification, especially in meeting mode.
  • the selective action on the sound spectrum and the real-time control and anticipation of the heating of the loudspeaker allow to keep said speaker at an acceptable operating temperature while preserving the sound volume felt.
  • the fully digital signal processing allows great flexibility in the signal processing and in the selection of the parameterization of the filters applied to said signal.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (12)

  1. Verfahren zur Regelung der Temperatur eines elektrodynamischen Lautsprechers (100), der eine von einem mit einem Anregungssignal (221) gespeisten Elektromotor angeregte Membran (140) aufweist, dadurch gekennzeichnet, dass es die Schritte aufweist, die darin bestehen:
    a. die Spektralverteilung der elektrischen Impedanz des Motors in der Zeit t1 zu erhalten (610);
    b. eine Impedanzspitze in einem vordefinierten Frequenzbereich der im Schritt a) erhaltenen Spektralverteilung zu erkennen (620);
    c. die Frequenzabweichung zwischen der zentralen Frequenz Fc1 der im Schritt b) erkannten Impedanzspitze und der zentralen Frequenz FC0 einer Impedanzspitze zu bestimmen (630), die im gleichen vordefinierten Frequenzbereich in einer Spektralverteilung elektrischer Impedanz des Motors erkannt wird, die in einer Zeit t0 vor t1 erhalten wurde;
    d. eine Korrelationsbeziehung zwischen der Frequenzabweichung (Fc0 - Fc1) und der Temperatur des Lautsprechers zu erhalten;
    e. die Temperatur des Lautsprechers abhängig vom Ergebnis des Schritts c) und der Korrelation des Schritts d) zu bestimmen (640, 670);
    dass die Schritte a) bis e) für jeden Zeitraum δt = (t1-t0) wiederholt werden, wenn der Lautsprecher in Betrieb ist;
    dass es nach dem Schritt e) einen Schritt enthält, der darin besteht:
    f. die Leistung des Anregungssignals in einem Frequenzband, Thermalband genannt, zu reduzieren (670, 695), wenn die im Schritt e) festgestellte Temperatur eine kritische Schwelle überschreitet;
    und dass die Spektralverteilung der Impedanz im Schritt a) durch die Messung einer Transferfunktion zwischen einem Signal (340) proportional zum Strom des analogen Anregungssignals (221) des Lautsprechers und dem verzögerten (412) digitalen Anregungssignal (212) des Lautsprechers erhalten wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Schritt e) die Schritte enthält, die darin bestehen:
    ei. eine Augenblickstemperatur T zum Zeitpunkt t1 durch die Frequenzabweichung zwischen den Impedanzspitzen zu bestimmen (640);
    eii. die Leistung des Anregungssignals zu bestimmen (650) und den Energieteil dieses Signals in Wärme umgewandelt zu bestimmen;
    eiii.abhängig vom Ergebnis des Schritts eii) die Temperatur des Lautsprechers zu einem Zeitpunkt (t1 + ε) so zu bestimmen (660), dass gilt ε ≥ δt.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es die Schritte enthält, die darin bestehen:
    g. die Spektralverteilung der Leistung des Anregungssignal zu erhalten (650);
    h. ausgehend von der im Schritt g) erhaltenen Verteilung die Leistung des Signals in einem Frequenzband, mechanisches Band genannt, zentriert auf die zentrale Frequenz Fc1 der im Schritt b) erhaltenen Impedanzspitze zu bestimmen (680);
    i. eine zulässige Anregungsleistung für das Verhalten der Membran des Lautsprechers zu erhalten;
    j. wenn (685) die im Schritt h) erhaltene Leistung größer als die oder gleich der im Schritt i) erhaltenen zulässigen Leistung ist, die Leistung des Anregungssignals im mechanischen Band zu reduzieren (690, 695).
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es nach dem Schritt c) und vor dem Schritt d) die Schritte enthält, die darin bestehen:
    k. einen Frequenzwert, Fstab , Stabilitätskriterium genannt, zu erhalten;
    l. die im Schritt c) erhaltene Frequenzabweichung mit dem Stabilitätskriterium zu vergleichen (635);
    m. die Schritte d), e) und f) auszuführen, wenn die Bedingung (∥Fc0-Fc1∥≤Fstab) wahr ist, und zum Schritt a) zurückzukehren, wenn diese Bedingung nicht erfüllt ist.
  5. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Leistungsreduzierungen des Anregungssignals der Schritte f) und j) durch Filterungen des Signals in selektiven Frequenzbändern durchgeführt werden, und dass das Verfahren die Schritte enthält, die darin bestehen:
    o. vor dem Schritt f) die Merkmale eines Filters, das selektiv die spektrale Leistung des Signals während des Schritts f) reduzieren kann, zu bestimmen (670);
    p. vor dem Schritt j) die Merkmale eines Filters, das selektiv die spektrale Leistung des Anregungssignals während des Schritts j) reduzieren kann, zu bestimmen (690).
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass das Anregungssignal (221) ein in ein analoges Signal umgewandeltes digitales Signal (212) ist, um den Motor des Lautsprechers anzuregen, und dass die Filter der Schritte o) und p) digitale Filter sind, die an das Anregungssignal (211) vor seiner Umwandlung in ein analoges Signal angewendet werden.
  7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der vordefinierte Frequenzbereich des Schritts c) zwischen 300 Hz und 1 000 Hz liegt.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass δt gleich 5.10-3 Sekunden ist.
  9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der umrahmende Frequenzbereich aus Thermalband auf eine Frequenz von 3,103 Hz zentriert ist.
  10. Vorrichtung (200), die das Verfahren nach Anspruch 1 durchführen kann, in einem Lautsprecher (100), dessen Motor von einem Anregungssignal (221) gespeist wird, wobei die Vorrichtung enthält:
    i. eine Verarbeitungseinrichtung (250) des Signals;
    ii. einen Rechner (240), der die Merkmale der von der Verarbeitungseinrichtung (250) des Signals ausgeführten Verarbeitung verändern kann;
    iii. eine Messeinrichtung (230) der Spektralverteilung der Impedanz des Lautsprechers,
    dadurch gekennzeichnet, dass die Einrichtung (230) einen Messwiderstand (331) einer Impedanz von weniger als 1/50 der Impedanz des Lautsprechers, der in Reihe auf die Versorgung des Motors des Lautsprechers montiert ist und vom Anregungssignal (221) durchquert wird, und Einrichtungen (332, 333) aufweist, die ein Signal proportional zur Spannung an den Klemmen des Widerstands liefern kann.
  11. Schallausstrahlungsgerät, insbesondere ein Mobiltelefon, das einen Lautsprecher aufweist, dadurch gekennzeichnet, dass es eine Vorrichtung nach Anspruch 10 aufweist.
  12. Gerät nach Anspruch 11, dadurch gekennzeichnet, dass es Einrichtungen aufweist, die einen Höhenanhebungsmodus der Schallausstrahlung durchführen können, dadurch gekennzeichnet, dass es Einrichtungen enthält, die ein Verfahren nach Anspruch 1 durchführen können, wenn der Höhenanhebungsmodus ausgewählt wird.
EP13716782.1A 2012-04-20 2013-04-15 Verfahren und vorrichtung zur regelung der betriebstemperatur eines lautsprechers Not-in-force EP2839676B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1253670A FR2989858A3 (fr) 2012-04-20 2012-04-20 Procede de protection thermique d'un haut-parleur et dispositif de protection thermique d'un haut-parleur associe
FR1350321A FR2989859B1 (fr) 2012-04-20 2013-01-15 Procede de protection thermique d'un haut-parleur et dispositif de protection thermique d'un haut-parleur associe
PCT/EP2013/057801 WO2013156439A1 (fr) 2012-04-20 2013-04-15 Procédé et dispositif pour le contrôle de la température de fonctionnement d'un haut-parleur

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EP2839676A1 EP2839676A1 (de) 2015-02-25
EP2839676B1 true EP2839676B1 (de) 2017-06-14

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EP13716782.1A Not-in-force EP2839676B1 (de) 2012-04-20 2013-04-15 Verfahren und vorrichtung zur regelung der betriebstemperatur eines lautsprechers

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EP (1) EP2839676B1 (de)
CN (1) CN104429099A (de)
FR (2) FR2989858A3 (de)
WO (1) WO2013156439A1 (de)

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CN107172561A (zh) * 2017-07-10 2017-09-15 顾康 一种音箱数字显示仪
CN109297614B (zh) * 2018-08-13 2020-05-19 厦门傅里叶电子有限公司 基于相位变化测量的喇叭温度保护方法

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DE112009005469B4 (de) * 2009-12-24 2019-06-27 Nokia Technologies Oy Lautsprecherschutzvorrichtung und Verfahren dafür
US9253584B2 (en) * 2009-12-31 2016-02-02 Nokia Technologies Oy Monitoring and correcting apparatus for mounted transducers and method thereof
EP2357726B1 (de) * 2010-02-10 2016-07-06 Nxp B.V. System und Verfahren zur Anpassung eines Lautsprechersignals
US8194869B2 (en) * 2010-03-17 2012-06-05 Harman International Industries, Incorporated Audio power management system

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FR2989859A1 (fr) 2013-10-25
FR2989859B1 (fr) 2016-07-01
WO2013156439A1 (fr) 2013-10-24
EP2839676A1 (de) 2015-02-25
CN104429099A (zh) 2015-03-18
FR2989858A3 (fr) 2013-10-25

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