EP2597889B1 - Kopfhörer mit nicht-adaptives aktiven geräuschkontrolle - Google Patents

Kopfhörer mit nicht-adaptives aktiven geräuschkontrolle Download PDF

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Publication number
EP2597889B1
EP2597889B1 EP20120193852 EP12193852A EP2597889B1 EP 2597889 B1 EP2597889 B1 EP 2597889B1 EP 20120193852 EP20120193852 EP 20120193852 EP 12193852 A EP12193852 A EP 12193852A EP 2597889 B1 EP2597889 B1 EP 2597889B1
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European Patent Office
Prior art keywords
filter
signal
audio
input
microphone
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Not-in-force
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EP20120193852
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English (en)
French (fr)
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EP2597889A1 (de
Inventor
Phong Hua
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Parrot SA
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Parrot SA
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1008—Earpieces of the supra-aural or circum-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
    • H04R2201/107—Monophonic and stereophonic headphones with microphone for two-way hands free communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07—Applications of wireless loudspeakers or wireless microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/05—Electronic compensation of the occlusion effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • the present invention relates to an audio headset comprising an "active noise control" system.
  • Such a headset can be used for listening to an audio source (music for example) from a device such as an MP3 player, radio, smart-phone, etc. to which it is connected by a wired connection or by a wireless link, in particular a connection of the Bluetooth type (trademark of the Bluetooth SIG).
  • the headset transducer then reproduces the voice of the remote speaker with which the wearer of the headset is in conversation.
  • the helmet includes two headphones joined by a bow.
  • Each earpiece comprises a closed shell housing a sound reproduction transducer (hereinafter simply referred to as a "transducer”) and intended to be applied around the user's ear with the interposition of a circumaural pad isolating the ear of the ear. external sound environment.
  • transducer a sound reproduction transducer
  • the headset When the headset is used in a noisy environment (metro, street, train, airplane, etc.) the wearer is partially protected from noise by the headphones headphones, which isolate it with the closed shell and the circumaural pad.
  • ANC Active Noise Control
  • the principle of which is to capture the incident noise component by means of a microphone placed on the hull helmet earphones and temporally and spatially superimposing on this noise component an acoustic wave which is ideally the inverted copy of the pressure wave of the noise component. This is to create in this manner a destructive interference with the noise component and reduce, ideally neutralize, the pressure variations of the parasitic acoustic wave.
  • a first category is that of ANC methods using adaptive filters, that is to say filters whose transfer function is dynamically changed, continuously, by a real-time analysis algorithm of the signal.
  • the DE 37 33 132 A1 is a typical example of an ANC processing implementing such adaptive filters.
  • Other examples of ANC methods involving adaptive filters are described in particular in the US 6,041,126 A , US 2003/0228019 A1 and WO 2005/112849 A2 .
  • the digital processing introduces significant delays in the compensation signal, and the adaptive character implies a minimum convergence time of the algorithms. All this hinders the responsiveness of the system, especially with regard to irregular noises. As a result, denoising is especially effective against essentially periodic noise in narrow bands.
  • the second category of ANC processes - to which belongs the technique of the invention - is that of non-adaptive fixed filtering systems, that is to say where the parameters of the various filters used are predetermined.
  • the feedback filtering channel is based on a signal collected by a microphone disposed within the acoustic cavity (hereinafter "front cavity") delimited by the shell of the earpiece, the circumaural pad and the transducer.
  • this microphone is arranged close to the ear of the user, and receives mainly the signal produced by the transducer and the residual noise signal, unneutralized, still noticeable in the front cavity.
  • the signal from this microphone from which the audio signal of the music source to be reproduced by the transducer is subtracted, constitutes an error signal for the feedback loop of the ANC system.
  • the feedforward filtering channel uses the signal picked up by the external microphone collecting the parasitic noise prevailing in the immediate environment of the helmet wearer.
  • a first disadvantage is the relatively high sensitivity to the variations of the electroacoustic paths between the transducer and the error microphone, that is to say the internal microphone placed in the front cavity.
  • the electro-acoustic response between these two elements can indeed be modified because of the volume variations of the front cavity and its sealing with respect to the outside.
  • the main factors likely to vary this electro-acoustic response are the positioning of the helmet on the head, the shape of the ear of the user, the different tightenings of the helmet on the head, and the presence of hair in the place where the circumaural pads come to bear.
  • Other variations may be due to the electronic components used (resistors, capacitors, transducer and microphone), whose electrical characteristics may fluctuate over time.
  • volume of the front cavity Another factor to take into account is the volume of the front cavity, since a reduced front volume increases the variability of the electroacoustic response between the transducer and the error microphone, since in this case the relative volume variation between the normal listening position and the transition position where the user approaches the helmet on his head will be more important.
  • a small front cavity volume is therefore an additional factor of loss of stability of the feedback loop, with the same consequences as those described above.
  • the settings of the various filter channels are adjusted to produce performance corresponding to a given electroacoustic response, for gain and phase margins to ensure sufficient stability and maximum performance.
  • a closed-loop system must generally have a phase margin greater than 45 ° and a gain margin of at least 10 dB. But these theoretical margins are often insufficient, because of the great variability of electroacoustic responses encountered in practice in the field of active noise control headphones.
  • the problem of the invention is, in such a non-adaptive ANC system, to fight against the risks of instability, with increased gain and phase margins allowing, despite a small front cavity volume, to avoid any appearance of effect waterbed or Larsen despite variations in the introduction of the helmet on the head, clamping headphones, sealing more or less good circumaural pads.
  • the audio signal from the music source (or the voice of the remote speaker, in a telephony application) should not be distorted and its spectrum should not be reduced by the ANC processing, although the signal of neutralization of noise and the audio signal to be reproduced are amplified by the same channel and reproduced by the same transducer.
  • the basic idea of the invention is to reduce the bandwidth of the feedback filter in the upper spectrum, that is to say in the unstable frequency zone, so as to reduce or even eliminate the risks of effect. water-bed or Larsen.
  • This limitation of the bandwidth can provide, as will be seen, an increase in the gain margin of at least 15 dB, preferably at least 17 dB, and the phase margin of at least 45 °, preferably at least 60 °.
  • the feedforward filter will compensate for the loss of performance in the higher frequencies of the noise spectrum to be eliminated (that is, around 1 kHz).
  • a stabilizing filter is arranged in parallel with the feedback filter .
  • This stabilizing filter makes it possible to increase the phase margin of the feed back filter by increasing the phase in the critical zone of the waterbed effect: to compensate for the phase decrease due to the acoustics, in particular due to the sound propagation path from the transducer to the error microphone, a limited resonance is created by the stabilizing filter to raise the phase and thus increase the phase margin.
  • These three channels are arranged in parallel, and the signals delivered at the output of the filters are combined with each other and with the audio signal to be reproduced by means of a combiner delivering a linear combination of these different signals, for amplification and reproduction by the transducer.
  • the predetermined instability zone in question is notably a zone of effect waterbed around a frequency of 1 kHz.
  • the upper cut-off frequency of the second filter is preferably less than 150 Hz, preferably less than 120 Hz, and its bandwidth less than 65 Hz, preferably less than 55 Hz.
  • the gain margin of the feedback branch of the active noise control is advantageously at least 15 dB, preferably at least 17 dB, and the phase margin of at least 45 °, preferably at least 60 °.
  • the audio signal to be reproduced is preferably inputted to both the second filter and the summing circuit, the second filter receiving as input a signal obtained by combining said error signal delivered by the internal microphone with at least a fraction of the signal audio to reproduce, and it is not applied to the third filter.
  • FIG. 1 there is shown a headphone placed on the head of his user.
  • This headset comprises, in a conventional manner, two earphones 10, 10 'joined by a holding bar 12.
  • Each of the earphones 10 comprises an outer shell 14 which is applied to the contour of the ear of the user. , with interposition between the shell 14 and the periphery of the ear of a flexible circumaural pad 16 for providing a sound seal, acoustically, between the region of the ear and the external sound environment.
  • the Figure 2 is a schematic representation showing the different acoustic and electrical signals as well as the various functional blocks involved in the operation of an active noise control headphones.
  • the earphone 10 encloses a sound reproduction transducer 18, hereinafter referred to simply as a "transducer”, carried by a partition 20 defining two cavities, namely a front cavity 22 on the side of the ear and a rear cavity 24 on the opposite side. .
  • the front cavity 22 is defined by the inner partition 18, the wall 14 of the earpiece, the pad 16 and the outer face of the user's head in the region of the ear. This cavity is a closed cavity, with the exception of the inevitable acoustic leaks in the region of contact of the pad 16.
  • the rear cavity 24 is a closed cavity, with the exception of an acoustic vent 26 for obtaining a strengthening of low frequencies in the front cavity 22 of the earpiece.
  • acoustic reinforcement is more advantageous than electric amplification, because it allows an improvement of the effect of suppression of ambient noise by the active control system, without saturation and with less electrical noise.
  • the earpiece 10 For active noise control, the earpiece 10 carries an external microphone 28 for sensing the surrounding noise outside the earpiece, schematized by the wave 30. The signal collected by this external microphone 28 is applied to a microphone. feedforward 32 filter stage of active noise control system.
  • Each earphone 10, 10 ' is provided with its own active noise control system, the respective external microphones 28, 28' ( Figure 1 ) being independent of each other.
  • the helmet may possibly wear, as shown Figure 1 , another external microphone 34 for communication functions, for example if the headset is provided with "hands-free" telephony functions.
  • This additional external microphone 34 is intended to capture the voice of the wearer of the helmet, it does not intervene in the active control of the noise and in the following we will only consider as external microphone that the microphone (s) 28 dedicated (s) ) active noise control.
  • the headset is also provided with an internal microphone 36 disposed as close as possible to the auditory canal of the ear, to capture the residual noise present in the internal cavity 22, noise that will be perceived by the user.
  • the internal microphone 36 collects a residual signal which is used as an error signal e applied to a feedback filter branch 42 in a closed loop and to a stabilizing branch 44 (Specific to the invention) whose signals are combined at 46 with the signal of the open loop feedforward branch 32 to drive the transducer 18.
  • the transducer 18 receives an audio signal to be reproduced from a musical source (walkman, radio, etc.), or the voice of the remote speaker, in a telephony application. As this signal experiences the effects of the closed loop distorting it, it will be preprocessed upstream by equalization in a digital signal processor, so as to present the desired transfer function, determined by the gain of the open loop and the response. target without active control.
  • FIGs 3 to 6 illustrate, according to several angles of view, an embodiment of the different mechanical and electroacoustic elements schematically represented on the Figure 2 , for one of the headphones 10 (the other headphone 10 'being made identically).
  • the partition 20 dividing the inside of the shell 14 into a front cavity 22 and a rear cavity 24 with, mounted on this partition, the transducer 18 and the internal microphone 36 carried by a grid 48 maintaining it nearby. of the ear canal of the user.
  • the external microphone 28 dedicated to the active noise control and the additional microphone 34 for the communication functions "hands-free", and the vent 26, consisting for example of a series of small holes covered with an acoustically resistive plastic gate.
  • the Figure 7 illustrates in block diagram form the active noise control circuit according to the invention, with the electrical and acoustic transfer functions involved in the operation of this circuit.
  • the circuit essentially comprises three branches arranged in parallel, with a feedforward filter 32, a feedback filter 42 and a stabilizing filter 44.
  • the injection of the audio signal to be reproduced S in two different places of the circuit makes it possible to obtain a balanced equalization between the low frequencies and the high frequencies. Indeed, the portion of the signal injected at the input of the general adder 46 will undergo attenuation of the active control, which will give acute frequency components; in contrast, the part of the signal injected on the adder 52 at the input of the feedback filter 42 will undergo the low-pass filtering of the circuit, giving serious frequency components.
  • the respective gains G8 and G4 applied to these two signal parts can balance the bass and treble spectrum of the signal to reproduce.
  • the audio signal to be reproduced is injected only at the input of the feedback filter 42 (via the adder 52), but is not input into the branch of the stabilizing filter 44, which makes it possible to adjust this stabilizing filtering without disturbing the equalization of the music to be reproduced: in fact, the stabilizing filter 44 receives only the sound picked up by the internal microphone 36, excluding the audio signal to be reproduced, which does not interfere with the stabilization function.
  • the output signal of the general adder 46 which is a linear combination of the signals from the three feedforward, feedback and stabilization filtering channels as well as the audio signal to be reproduced, is applied to the transducer 18 after amplification by a power stage. 54.
  • FIGS 8, 9 and 10 illustrate examples of embodiments, in analog technology, of the feedforward 32, feedback 42 and stabilizer 44 filters respectively.
  • V i and V o indicate the voltages respectively of the input and the output of the filters
  • V mid indicates the voltage middle between the positive and negative terminals of the power supply of the operational amplifier used by the filter.
  • these three filters can be made with a minimum of components, so with a very low material cost.
  • the feedforward 32 and feedback filters 42 are made as first-order low-pass filters, but it is possible without difficulty to carry out second-order bandpass filters by modification. resistive and capacitive elements.
  • ⁇ represents all loopbacks of orders greater than or equal to 2; concretely, this term is negligible in the other terms of the numerator and will be ignored.
  • because H o contains the additional attenuation due to the shell of the earpiece.
  • the Figure 8 illustrates an example of a survey according to the frequency of the H o lH a module , which therefore represents the attenuation of the shell of the earpiece relative to the internal attenuation of the cavity.
  • the stability of the feedforward H FF is greater than that of the H FB feedback due to the absence of a feedback loop (the feedforward operates in an open loop).
  • feedforward and feedback tend to produce an undesirable effect of noise amplification in a small band of frequencies beyond the noise suppression band, usually around 1 kHz ( “waterbed effect” ).
  • this effect can quickly run out and turn into a feedback effect.
  • the noise suppression by a feedforward filter alone is typically close to 10 dB, while with a feedback it is possible to reach 20 dB.
  • the increase of the gain and phase margins by a reduction of the bandwidth was chosen in preference to a reduction of the open-loop gain (which would also have made it possible to increase these margins): a reduction of the gain in An open loop has the disadvantage of reducing the maximum performance of the active noise control, as opposed to a reduction in the bandwidth, which only reduces the attenuation frequency band of the noise control circuit. Therefore, in order not to reduce the maximum attenuation of the noise, the reduction of the bandwidth has been chosen in preference to a reduction of the open loop gain of the feedback filter .
  • This feedforward filter As far as the feedforward filter is concerned , it is more stable because it operates in an open loop. It can therefore be used in the highest frequencies (up to 1 kHz) to compensate for the bandwidth loss of the feedback filter .
  • This feedforward filter has a low gain and a low quality factor compared to the feedback filter , and its performance is adjusted to cover a wide band of frequencies.
  • the Figure 12 illustrates the Bode (amplitude and phase versus frequency) diagram of this feedforward 32 filter.
  • the stabilizing filter 44 its paralleling with the feedback filter 42 increases the phase margin of the latter in particular in the critical zone of the waterbed effect . And to compensate for the phase decrease due to acoustics, in particular because of the sound propagation path of the sound of the transducer to the error microphone (transfer function Ha ) the stabilizing filter creates a local resonance in this area allowing increase the phase and thus increase the phase margin.
  • the Figure 13 illustrates the place of Black of the system, that is to say the Cartesian representation of the module of the open loop ( H to H FB ) according to its phase, by varying the frequency from 0 Hz to infinity.
  • the theoretical attenuation curve of the Figure 17 shows that the area of the waterbed effect at 1 kHz is decreased. It can be noted that the waterbed effect area at 6 kHz is degraded but does not exceed 4 dB, like that at 1 kHz.
  • This figure illustrates the simulated attenuation of the closed loop, where we can see a reduction in the depth of the waterbed effect in the 1 kHz zone from system A to system B (4 dB improvement) and the system B to system C (+3 dB improvement).
  • the attenuation loss of about -5 dB found in the 100-800 Hz zone between system A and system B or C will be offset by the active control provided by the fixed feedforward filter 32.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Headphones And Earphones (AREA)

Claims (8)

  1. Kopfhörer, der zwei Hörer (10) umfasst, die durch einen Haltebügel (12) miteinander verbunden sind und jeweils einen Wandler (18) zur Schallwiedergabe eines wiederzugebenden Audiosignals enthalten, wobei sich dieser Wandler in einem Schallhohlraum befindet, der durch eine Schale (14) begrenzt ist, der mit einem das Ohr umgebenden Kissen (16) versehen ist,
    wobei dieser Kopfhörer ein aktives Rauschsteuersystem umfasst, das seinerseits umfasst:
    - einen ersten Vorwärtskopplungszweig mit offener Schleife, der ein erstes Bandpassfilter (32) enthält, das an seinem Eingang ein Signal empfängt, das von einem externen Mikrophon (28) geliefert wird, das akustisches Rauschen (30) aufnehmen kann, das in der Umgebung des Kopfhörers herrscht;
    - einen zweiten Rückkopplungszweig mit geschlossener Schleife, der ein zweites Bandpassfilter (42) enthält, das am Eingang ein Fehlersignal (e) empfängt, das von einem Mikrophon (36) innerhalb des Hohlraums geliefert wird;
    - einen dritten Zweig mit einem dritten Filter (44) ; und
    - eine Mischungsschaltung (46), die am Eingang die von dem ersten, dem zweiten und dem dritten Filter gelieferte Signale sowie das wiederzugebende Audiosignal (S) empfängt und am Ausgang ein Signal liefert, das nach Verstärkung (54) den Wandler (18) steuern kann,
    dadurch gekennzeichnet, dass:
    - die aktive Rauschsteuerung eine nicht adaptive Steuerung ist, wobei die Parameter des ersten, des zweiten und des dritten Filters (32, 42, 44) vorgegebene Parameter sind;
    - das dritte Filter (44) ein Stabilisator-Bandpassfilter ist, das parallel zu dem zweiten Rückkopplungszweig angeordnet ist und am Eingang das von dem internen Mikrophon gelieferte Signal empfängt und am Ausgang ein Signal liefert, das in den Eingang der Kombiniererschaltung eingegeben wird,
    wobei dieses dritte Filter dafür ausgelegt ist, die Phase der Übertragungsfunktion des zweiten Filters in einer vorgegebenen Instabilitätszone lokal zu erhöhen;
    - wobei der erste, der zweite und der dritte Zweig parallel geschaltet sind und die Mischungsschaltung eine Summationsschaltung (46) ist, die am Ausgang eine Linearkombination der von dem ersten, dem zweiten und dem dritten Filter (32, 42, 44) gelieferten Signale sowie wenigstens einen Bruchteil des wiederzugebenden Audiosignals (S) mit Gewichtung der jeweiligen Verstärkungen (G5-G8), die auf diese Signale angewendet werden, liefert.
  2. Kopfhörer nach Anspruch 1, wobei die vorgegebene Instabilitätszone eine Zone mit Wasserbettwirkung um eine Frequenz von 1 kHz ist.
  3. Kopfhörer nach Anspruch 1, wobei die obere Kappungsfrequenz des zweiten Filters niedriger als 150 Hz, vorzugsweise niedriger als 120 Hz, ist.
  4. Kopfhörer nach Anspruch 1, wobei die Bandbreite des zweiten Filters kleiner als 65 Hz, vorzugsweise kleiner als 55 Hz, ist.
  5. Kopfhörer nach Anspruch 1, wobei der Verstärkungsbereich des Rückkopplungszweigs der aktiven Rauschsteuerung wenigstens 15 dB, vorzugsweise wenigstens 17 dB, ist.
  6. Kopfhörer nach Anspruch 1, wobei der Phasenbereich des Rückkopplungszweigs der aktiven Rauschsteuerung wenigstens 45°, vorzugsweise wenigstens 60°, ist.
  7. Kopfhörer nach Anspruch 1, wobei das wiederzugebende Audiosignal (S) in den Eingang sowohl des zweiten Filters (42) als auch der Summationsschaltung (46) eingegeben wird, wobei das zweite Filter am Eingang ein Signal empfängt, das durch Kombination (52) des von dem internen Mikrophon (36) gelieferten Fehlersignals (e) mit wenigstens einem Bruchteil des wiederzugebenden Audiosignals erhalten wird.
  8. Kopfhörer nach Anspruch 7, wobei das wiederzugebende Audiosignal (S) in das dritte Filter (44) nicht eingegeben wird.
EP20120193852 2011-11-22 2012-11-22 Kopfhörer mit nicht-adaptives aktiven geräuschkontrolle Not-in-force EP2597889B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1160642A FR2983026A1 (fr) 2011-11-22 2011-11-22 Casque audio a controle actif de bruit de type non-adaptatif, pour l'ecoute d'une source musicale audio et/ou pour des fonctions de telephonie "mains-libres"

Publications (2)

Publication Number Publication Date
EP2597889A1 EP2597889A1 (de) 2013-05-29
EP2597889B1 true EP2597889B1 (de) 2014-06-04

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US (1) US8948409B2 (de)
EP (1) EP2597889B1 (de)
JP (1) JP2013110746A (de)
CN (1) CN103139677A (de)
FR (1) FR2983026A1 (de)

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EP2597889A1 (de) 2013-05-29
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FR2983026A1 (fr) 2013-05-24
US20130129105A1 (en) 2013-05-23
US8948409B2 (en) 2015-02-03

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