EP2786596B1 - Procédé et dispositif pour vérifier un système de haut-parleur - Google Patents

Procédé et dispositif pour vérifier un système de haut-parleur Download PDF

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Publication number
EP2786596B1
EP2786596B1 EP12791789.6A EP12791789A EP2786596B1 EP 2786596 B1 EP2786596 B1 EP 2786596B1 EP 12791789 A EP12791789 A EP 12791789A EP 2786596 B1 EP2786596 B1 EP 2786596B1
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EP
European Patent Office
Prior art keywords
loudspeaker
duty cycle
duration
time duration
test sequence
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EP12791789.6A
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German (de)
English (en)
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EP2786596A1 (fr
Inventor
Thomas LUKASCZYK
Waldemar REMPEL
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Continental Automotive GmbH
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Continental Automotive GmbH
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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
    • 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

Definitions

  • the invention relates to a method and a corresponding device for checking a loudspeaker arrangement with a loudspeaker having a loudspeaker diaphragm.
  • warning systems are, for example, parking assistance systems, distance and speed warning systems, ice alert systems and / or microsleep warning systems. These warning systems mostly use acoustic signals as a warning.
  • the acoustic warning signals are output via loudspeakers intended for the special output of the warning signals.
  • Safety requirements for motor vehicles require that these speakers must be checked regularly for their functionality.
  • the EP 1 564 561 A1 describes a method and a device having the features of the preamble of patent claims 1 and 7, respectively.
  • the EP 2 355 542 A1 describes a method for monitoring a speaker output by means of a plurality of measurement frequencies, wherein the impedance at the respective measurement frequency is determined from the respective measured voltages and currents.
  • the EP 2 023 670 A1 describes a method and apparatus for detecting the malfunction of a loudspeaker. In this case, an audio signal is generated, which is applied to the speaker and a feedback signal of the speaker is evaluated.
  • the EP 0 841 570 A2 describes an automatic detection of shorted loudspeakers in an audio system of an automobile. Here it is determined whether connections of the loudspeakers are short-circuited or whether connections of the loudspeakers are incorrectly connected to the supply voltage or to ground.
  • the object on which the invention is based is to provide a method and a device for checking a loudspeaker arrangement, which makes it possible to reliably check the operability of the loudspeaker arrangement.
  • the invention is characterized by a method and a corresponding device for checking a loudspeaker arrangement with a loudspeaker.
  • the loudspeaker has a loudspeaker diaphragm for generating an acoustic signal.
  • the loudspeaker arrangement comprises a drive circuit for electrical control of the loudspeaker.
  • the loudspeaker is supplied via the drive circuit during a respective test sequence duration with a digital pulse test signal having a predetermined changing duty cycle, wherein the duty cycle is changing such that at the beginning of the test sequence duration, the duty cycle increases over several periods of the test sequence duration and the end the test sequence duration reduces the duty cycle over several periods of the test sequence duration.
  • a measured variable representative of a voltage dropping at a reference circuit connected in series with the loudspeaker is detected, and depending on a comparison of the measured variable with a predetermined reference value, the loudspeaker arrangement is classified as functional.
  • this allows a continuity test and a short-circuit test of the loudspeaker as well as a loudspeaker connection, for example of plugs.
  • the drive circuit for the speaker is also checked, since the speaker is controlled via the drive circuit and thus includes the test also the drive circuit with.
  • the method according to the invention or the device according to the invention thus makes it possible to check the loudspeaker arrangement with a high test depth and test safety. In comparison to monitoring circuits which are designed to test the loudspeaker only for a circuit interruption, a significantly higher test depth and test safety can be achieved with the method according to the invention or the device according to the invention.
  • the method according to the invention or the device according to the invention enables a simple, and thus inexpensive, and reliable checking of the loudspeaker arrangement. For a check are in addition to a drive circuit, which is only designed to control the speaker in normal operation, only a few, simple electronic components necessary. Elaborate components, such as a microphone, are not required.
  • a further advantage is that the pulse duty factor can be set in such a way that the loudspeaker diaphragm of the loudspeaker is deflected in such a way that the deflection of the loudspeaker diaphragm and thus the impact of the loudspeaker on the pulse test signal with a human ear is imperceptible.
  • the loudspeaker arrangement can be arranged in a vehicle, for example in a motor vehicle.
  • the loudspeaker arrangement can be provided for the output of acoustic warning signals and, for example, can be signal-technically coupled to a control and / or monitoring unit of the motor vehicle by signal technology.
  • a pulse frequency of the pulse test signal is greater than a natural frequency of the speaker diaphragm.
  • this makes it possible to avoid self-oscillation of the loudspeaker diaphragm and to prevent the loudspeaker diaphragm from falling back into its rest position between two pulses.
  • the pulse frequency of the pulse test signal is greater than a maximum audible frequency of a human.
  • the maximum listening frequency of the human being is approximately 20 kHz.
  • the pulse frequency which can also be referred to as the carrier frequency of the pulse test signal, thus lies outside an audible range of the human.
  • the respective test sequence duration comprises a first time duration, a second time duration Time duration immediately following the first time duration and a third time duration immediately following the second time duration.
  • the duty cycle increases from 0% to 100%, within the second time period the duty cycle is constant 100% and during a third time duration the duty cycle decreases from 100% to 0%.
  • a speed at which the duty cycle changes during the first time period and / or the third time duration is selected such that the reciprocal of the speed represents a frequency that is less than a minimum human listening frequency.
  • the minimum human listening frequency is equal to approximately 16 Hz.
  • the rate at which the duty cycle changes during the time period and / or the third time period may also be referred to as the rate of change.
  • this makes it possible to predetermine the deflection of the loudspeaker diaphragm in such a way that no sound waves are generated by the loudspeaker diaphragm which are perceptible to the human ear.
  • the duty cycle is set such that the deflection of the loudspeaker diaphragm increases monotonically from a rest position value of the loudspeaker diaphragm to a predefined deflection value during the first time period, while the deflection of the loudspeaker diaphragm has the predefined deflection value during the second time duration third time period, the deflection of the predetermined deflection value monotonically drops to the rest position value.
  • the deflection of the loudspeaker diaphragm can thus be predetermined in such a way that higher and audible frequency components can be avoided and thus no sound waves can be generated by the loudspeaker diaphragm, which are perceptible to the human ear.
  • the duty cycle is so changing that the deflection the loudspeaker diaphragm rises from the rest position value during the first time period up to the predefined deflection value according to an increasing sin 2 function profile, during the second time period the deflection of the loudspeaker diaphragm has the predefined deflection value and during the third time period the deflection from the predefined deflection value to the rest position value falls off according to a decreasing sin 2- function curve.
  • FIG. 1 shows a speaker assembly (10) with a speaker (20) and a drive circuit (30) for the speaker (20) and a device (15) for checking the speaker assembly (10).
  • the device (15) comprises, for example a signal generator (50) and a measuring and evaluation device (60).
  • the signal generator (50) is designed, for example, to generate a digital pulse test signal (P) during a respective test sequence duration (TS) which has a predetermined changing duty cycle, wherein the duty cycle is preset in such a way that at the beginning of the test sequence duration (TS) the duty cycle increases over several periods of the test sequence duration (TS) and at the end of the test sequence duration (TS) the duty cycle decreases over several periods of the test sequence duration (TS).
  • the signal generator (50) can also be used, for example, during normal operation of the loudspeaker arrangement (10) to output digital signals representing predetermined warning signals to the drive circuit (30).
  • the drive circuit (30) is preset coupled to the signal generator (50).
  • the drive circuit (30) is electrically coupled to the speaker (20).
  • the loudspeaker arrangement (10) and the device (15) are arranged, for example, in a motor vehicle. An arrangement in another vehicle, for example in an airplane, or in a building, is also possible.
  • the loudspeaker (20) is coupled via the drive circuit (30), for example, to a warning system of the motor vehicle, for example a distance warning system.
  • the loudspeaker (20) is designed to generate acoustic signals depending on one or more control signals of the warning system.
  • the loudspeaker (20) has a loudspeaker membrane.
  • the loudspeaker (20) is designed, for example, as an electrodynamic loudspeaker (20).
  • the loudspeaker diaphragm of the electrodynamic loudspeaker is characterized by an interaction driven between an electric current and a DC magnetic field.
  • the electrodynamic loudspeaker (20) has a coil which is arranged in a direct magnetic field of a magnet. The coil can be charged with an alternating current, so that a Lorenz force is generated, which exerts a force on the speaker diaphragm, which causes them to vibrate.
  • the drive circuit (30) comprises, for example, a full-bridge circuit for driving the loudspeaker (20).
  • the drive circuit (30) may comprise another suitable amplifier circuit known to the person skilled in the art, for example a half-bridge circuit.
  • the loudspeaker (20) is arranged, for example, in a diagonal of the full-bridge circuit.
  • the full-bridge circuit has, for example, four switching elements (31, 33, 35, 37), a first (31), second (33), third (35) and fourth switching element (37).
  • the first (31) and the second switching element (33) comprise, for example, in each case a driver circuit with, for example, in each case a pnp bipolar transistor.
  • the third (35) and fourth (37) switching elements each comprise a driver circuit with, for example, an npn bipolar transistor.
  • transistors of a different type, for example field effect transistors can also be used for the driver circuits.
  • the drive circuit (30) comprises a fifth switching element (38) and a reference circuit (39).
  • the fifth switching element (38) comprises, for example, a driver circuit with, for example, an npn bipolar transistor.
  • the reference circuit (39) has, for example, an impedance.
  • the impedance is chosen to be at least approximately equal to an input impedance of the loudspeaker (20). is.
  • the impedance may include, for example, a 10 ohm resistor.
  • a respective first connection node (31_1), (33_1) of the first switching element (31) and of the second switching element (33) are, for example, electrically coupled to the supply voltage VCC.
  • a second terminal node (31_2) of the first switching element (31) is electrically coupled to a first terminal node (37_1) of the fourth switching element (37).
  • a second terminal node (37_2) of the fourth switching element (37) is electrically coupled to a reference potential (GND).
  • a second connection node (33_2) of the second switching element (33) is electrically coupled to a first connection node (35_1) of the third switching element (35).
  • a second terminal node (35_2) of the third switching element (35) is electrically coupled to the reference potential (GND).
  • a first terminal (48) of the loudspeaker (20) is electrically coupled to the second terminal node (33_2) of the second switching element (33) and the first terminal node (35_1) of the third switching element (35).
  • a second terminal (49) of the loudspeaker (20) is electrically coupled to the second terminal node (31_2) of the first switching element (31), the first terminal node (37_1) of the fourth switching element (37) and to a first terminal (39_1) of the reference circuit (39).
  • a second connection point (39_2) of the reference circuit (39) is electrically coupled to a first connection node (38_1) of the fifth switching element (38).
  • the second terminal node (38_2) of the fifth switching element (38) is electrically coupled to the reference potential (GND).
  • the switching elements (31, 33, 35, 37, 38) each have a control terminal (31_3, 33_3, 35_3, 37_3, 38_3).
  • the control connections (31_3, 33_3, 35_3, 37_3, 38_3) of the switching elements (31, 33, 35, 37, 38) are predetermined electrically coupled to outputs of the signal generator (50).
  • the fifth switching element (38) has a blocking operation state, so that no current can flow away via the reference circuit (39) and the fifth switching element (38).
  • the first (31) and fourth switching element (37) are driven inversely to each other and the second (33) and third switching element (35) are also driven inversely to each other. This causes a current to flow alternately in a first direction and in a second direction through the speaker (20).
  • the fifth switching element (38) replaces the fourth switching element (37) or is activated in addition to the fourth switching element (37) analogously to the fourth switching element (37).
  • This allows the current to flow, at least in part, through the reference circuit (39) and to produce a voltage drop between the first connection point (39_1) and the second connection point (39_2) of the reference circuit (39), which is detected by the measuring and evaluation device (60 ) can be detected.
  • the measuring and evaluation device (60) may comprise, for example, a suitably designed analog-to-digital converter. Such an arrangement has the advantage that a separate test of an analog-to-digital converter input is not required, since only a functioning analog-to-digital converter can generate a suitable measurement signal.
  • the measuring and evaluation device (60) is designed, for example, during the respective test sequence duration (TS) to detect a measured quantity (U) which is representative of the voltage which is present at the reference circuit (39) connected in series with the loudspeaker (20). drops, and depending on a comparison the measured variable (U) with a predetermined reference value, the speaker assembly (10) classify as functional.
  • FIG. 2 shows by way of example a time course of the pulse test signal (P) during the respective test sequence duration (TS).
  • P pulse test signal
  • TS test sequence duration
  • the checking of the loudspeaker arrangement (10) can take place, for example, at predetermined time intervals during operation of the motor vehicle and / or at the beginning of operation of the motor vehicle and / or shortly before the start of operation of the motor vehicle. For example, it can be provided that in each case when a driver enters the motor vehicle, a review of the speaker assembly (10) is performed. For example, this can be detected by means of a suitably designed sensor, whether a occupancy of a vehicle steering seat has changed.
  • the Pulsprüfsignal (P) has a predetermined changing duty cycle.
  • the duty cycle is set such that at the beginning of the test sequence duration (TS) the duty cycle increases over several periods of the test sequence duration (TS) and at the end of the test sequence duration (TS) the duty cycle decreases over several periods of the test sequence duration (TS).
  • the respective test sequence duration (TS) may comprise a first time duration (T1), a second time duration (T2) immediately following the first time duration (T1), and a third time duration (T3) immediately following the second time duration (T2 ) follows.
  • T1 the duty cycle increases from 0% to 100%
  • T2 the duty cycle is constant 100%
  • T3 the duty cycle decreases from 100% to 0%.
  • a speed at which the duty cycle changes during each of the first time period (T1) and / or the third time duration (T3) is selected so that the reciprocal of the speed represents a frequency smaller than a minimum human listening frequency.
  • the test sequence duration (TS) can be 100 ms, for example.
  • the test sequence duration (TS) is to be selected such that the test sequence frequency corresponding to the test sequence duration (TS) is less than the minimum human listening frequency, so as to ensure that the deflection (L) of the loudspeaker diaphragm does not generate sound waves, the frequency components which are audible to human hearing.
  • the first (T1) and third time periods (T3) may last 25 ms, for example.
  • the measurand (U) representative of a voltage dropping at a reference circuit (39) connected in series to the loudspeaker (20) is detected and dependent on a comparison of the measurand (U) with a voltage predetermined reference value, the speaker assembly (10) is classified as functional.
  • the measured variable (U) can be detected and evaluated once or several times during the second time duration (T2).
  • FIG. 3 shows an exemplary time course of a deflection (L) of the speaker diaphragm.
  • the duty cycle may, for example, be changed so that the deflection (L) of the loudspeaker diaphragm increases monotonically from a rest position value of the loudspeaker diaphragm during the first time period (T1) to a predetermined deflection value, during the second time duration (T2) the deflection (L) the speaker diaphragm has the predetermined deflection value and during the third time period (T3), the deflection (L) from the predetermined deflection value decreases monotonically to the rest position value.
  • the duty cycle may be set to vary such that the deflection (L) of the speaker diaphragm during the first time period (T1) increases from the rest position value up to the predetermined deflection value according to an increasing sin 2 function curve, during the second time period (T2) Deflection (L) of the speaker diaphragm has the predetermined deflection value and during the third period of time (T3), the deflection (L) from the predetermined deflection value to the rest position value drops according to a falling sin 2 -functional course.
  • FIG. 4 shows a frequency diagram with an audible frequency range (B1) of humans and a functional frequency range (B2) of the speaker (20) in which the speaker diaphragm is deflectable.
  • the loudspeaker diaphragm has, for example, an upper maximum cutoff frequency, up to which a deflection of the loudspeaker diaphragm can take place.
  • a third frequency range (B3) is shown, which represents a transition region of the loudspeaker (20), in which the loudspeaker (20) is preferably operated.
  • FIG. 4 different frequencies with respect to the pulse test signal (P) and the loudspeaker (20).
  • a pulse frequency (fP) of the pulse test signal (P) is constant.
  • the pulse frequency (fP) of the pulse test signal (P) is greater than a natural frequency (fM) of the speaker diaphragm.
  • the natural frequency (fM) of the loudspeaker diaphragm is for example 3 kHz.
  • the pulse rate (fP) of the pulse test signal (P) is greater than a maximum human listening frequency.
  • the pulse rate (fP) is chosen such that that it is smaller than the upper maximum cutoff frequency of the loudspeaker (20).
  • the test sequence duration (TS) can be 100 ms, for example.
  • the test sequence is repeated, for example, at predetermined intervals.
  • the test sequence frequency corresponding to the test sequence duration (TS) is for example 10 Hz.
  • the test sequence frequency is preferably chosen such that it lies below the audible frequency range (B1) of the human.
  • a first pulse of the pulse test signal (P) has a very short pulse duration (td), for example 20 ns; that is, the lowest frequency component of the first pulse is approximately 20 MHz and thus far outside the audible frequency range (B1).
  • td very short pulse duration
  • Such a short pulse still does not allow membrane deflection.
  • the duty cycle is changed such that the deflection (L) of the loudspeaker diaphragm during the first time period (T1) increases from the rest position value to the predetermined deflection value according to an increasing sin 2 function curve ,
  • This type of deflection (L) means that higher and audible frequency components can be greatly reduced.
  • a frequency (fA) of the rise can be determined by means of a Fourier transformation of the course of the deflection (L) of the loudspeaker diaphragm.
  • the frequency of the increase in this case is smaller than a minimum human hearing frequency.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (7)

  1. Procédé de contrôle d'un arrangement de haut-parleur (10) comprenant un haut-parleur (20) qui possède une membrane de haut-parleur pour générer un signal sonore et un circuit d'excitation (30) destiné à exciter électriquement le haut-parleur (20), le procédé comprenant les étapes suivantes :
    - le haut-parleur (20) est alimenté avec un signal de contrôle impulsionnel (P) numérique par le biais du circuit d'excitation (30) pendant une durée de séquence d'impulsions (TS) correspondante,
    - une grandeur mesurée (U) est acquise pendant la durée de séquence d'impulsions (TS) correspondante, laquelle est représentative d'une chute de tension aux bornes d'un circuit de référence (39) branché en série avec le haut-parleur (20), et
    - l'arrangement de haut-parleur (10) est classifié comme étant fonctionnel en fonction d'une comparaison de la grandeur mesurée (U) avec une valeur de référence prédéfinie, caractérisé en ce que le signal de contrôle (P) possède un rapport cyclique à variation prédéfinie, la variation du rapport cyclique étant prédéfinie de telle sorte qu'au début de la durée de séquence d'impulsions (TS), le rapport cyclique augmente sur plusieurs durées de période de la durée de séquence d'impulsions (TS) et, à la fin de la durée de séquence d'impulsions (TS), le rapport cyclique diminue sur plusieurs durées de période de la durée de séquence d'impulsions (TS).
  2. Procédé selon la revendication 1, selon lequel une fréquence d'impulsion (fP) du signal de contrôle impulsionnel (P) est supérieure à une fréquence propre (fM) de la membrane du haut-parleur.
  3. Procédé selon la revendication 1 ou 2, selon lequel la fréquence d'impulsion (fP) du signal de contrôle impulsionnel (P) est supérieure à une fréquence audible maximale d'une personne.
  4. Procédé selon l'une des revendications précédentes, selon lequel
    - la durée de séquence d'impulsions (TS) correspondante comprend une première durée (T1), une deuxième durée (T2) qui suit immédiatement la première durée (T1), et une troisième durée (T3) qui suit immédiatement la deuxième durée (T2), et
    - pendant la première durée (T1), le rapport cyclique augmente de 0 % à 100 %,
    - le rapport cyclique est constant à 100 % au sein de la deuxième durée (T2) et
    - pendant la troisième durée (T3), le rapport cyclique diminue de 100 % à 0 %, une vitesse à laquelle le rapport cyclique varie respectivement pendant la première durée (T1) et/ou pendant la troisième durée (T3) étant choisie de telle sorte que la valeur inverse de la vitesse représente une fréquence qui est inférieure à une fréquence audible minimale de l'homme.
  5. Procédé selon l'une des revendications précédentes, selon lequel la variation du rapport cyclique est prédéfinie de telle sorte que la déviation (L) de la membrane de haut-parleur pendant la première durée (T1) augmente de manière monotone depuis une valeur de position de repos de la membrane de haut-parleur jusqu'à une valeur de déviation prédéfinie, pendant la deuxième durée (T2) la déviation (L) de la membrane de haut-parleur présente la valeur de déviation prédéfinie et pendant la troisième durée (T3) la déviation (L) décroit de manière monotone depuis la valeur de déviation prédéfinie à la valeur de position de repos.
  6. Procédé selon l'une des revendications précédentes, selon lequel la variation du rapport cyclique est prédéfinie de telle sorte que la déviation (L) de la membrane de haut-parleur pendant la première durée (T1) augmente depuis la valeur de position de repos jusqu'à la valeur de déviation prédéfinie selon une courbe de fonction sin2 croissante, pendant la deuxième durée (T2) la déviation (L) de la membrane de haut-parleur présente la valeur de déviation prédéfinie et pendant la troisième durée (T3) la déviation (L) décroit selon une courbe de fonction sin2 décroissante depuis la valeur de déviation prédéfinie à la valeur de position de repos.
  7. Dispositif (15) de contrôle d'un arrangement de haut-parleur (10) comprenant un haut-parleur (20) qui possède une membrane de haut-parleur pour générer un signal sonore et un circuit d'excitation (30) destiné à exciter électriquement le haut-parleur (20), le dispositif (15) possédant un générateur de signal et étant configuré pour :
    - alimenter le haut-parleur (20) avec un signal de contrôle impulsionnel (P) numérique par le biais du circuit d'excitation (30) pendant une durée de séquence d'impulsions (TS) correspondante,
    - acquérir une grandeur mesurée (U) pendant la durée de séquence d'impulsions (TS) correspondante, laquelle est représentative d'une chute de tension aux bornes d'un circuit de référence (39) branché en série avec le haut-parleur (20), et
    - suivant une comparaison de la grandeur mesurée (U) avec une valeur de référence prédéfinie, classifier l'arrangement de haut-parleur (10) comme étant fonctionnel,
    caractérisé en ce que le générateur de signal (50) est configuré pour générer le signal de contrôle de telle sorte que le signal de contrôle (P) possède un rapport cyclique à variation prédéfinie, la variation du rapport cyclique étant prédéfinie de telle sorte qu'au début de la durée de séquence d'impulsions (TS), le rapport cyclique augmente sur plusieurs durées de période de la durée de séquence d'impulsions (TS) et, à la fin de la durée de séquence d'impulsions (TS), le rapport cyclique diminue sur plusieurs durées de période de la durée de séquence d'impulsions (TS).
EP12791789.6A 2011-12-02 2012-11-30 Procédé et dispositif pour vérifier un système de haut-parleur Active EP2786596B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011087676A DE102011087676A1 (de) 2011-12-02 2011-12-02 Verfahren und Vorrichtung zur Überprüfung einer Lautsprecheranordnung
PCT/EP2012/074020 WO2013079629A1 (fr) 2011-12-02 2012-11-30 Procédé et dispositif pour vérifier un système de haut-parleur

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EP2786596A1 EP2786596A1 (fr) 2014-10-08
EP2786596B1 true EP2786596B1 (fr) 2016-07-20

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US (1) US9277342B2 (fr)
EP (1) EP2786596B1 (fr)
CN (1) CN103959823B (fr)
DE (1) DE102011087676A1 (fr)
WO (1) WO2013079629A1 (fr)

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US9412390B1 (en) * 2010-04-12 2016-08-09 Smule, Inc. Automatic estimation of latency for synchronization of recordings in vocal capture applications
US11146901B2 (en) 2013-03-15 2021-10-12 Smule, Inc. Crowd-sourced device latency estimation for synchronization of recordings in vocal capture applications
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US20150036833A1 (en) 2015-02-05
CN103959823B (zh) 2016-09-07
WO2013079629A1 (fr) 2013-06-06
US9277342B2 (en) 2016-03-01
EP2786596A1 (fr) 2014-10-08
DE102011087676A1 (de) 2013-06-06

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