EP2945399A1 - Audiokopfhörer mit aktiver anc-geräuschkontrolle mit vorbeugung gegen sättigungseffekte eines feedback-mikrophonsignals - Google Patents

Audiokopfhörer mit aktiver anc-geräuschkontrolle mit vorbeugung gegen sättigungseffekte eines feedback-mikrophonsignals Download PDF

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Publication number
EP2945399A1
EP2945399A1 EP15166492.7A EP15166492A EP2945399A1 EP 2945399 A1 EP2945399 A1 EP 2945399A1 EP 15166492 A EP15166492 A EP 15166492A EP 2945399 A1 EP2945399 A1 EP 2945399A1
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EP
European Patent Office
Prior art keywords
signal
microphone
anc
feedback
filter
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Granted
Application number
EP15166492.7A
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English (en)
French (fr)
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EP2945399B1 (de
Inventor
Phong Hua
Vu Hoang Co Thuy
Pierre Guiu
Benoit Pochon
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Parrot Drones SAS
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Parrot SA
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    • 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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; DEAF-AID SETS; 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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/01—Input selection or mixing for amplifiers or loudspeakers

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 headset usually includes two headphones joined by a hoop.
  • 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
  • ear-type earphones with an element to be placed in the ear canal, thus having no cushion surrounding or covering the ear.
  • headphones type “headphones” with a transducer housed in a shell surrounding the ear helmet “circum-aural" or in support thereof (helmet “supra-aural")
  • this example should not be considered as limiting, the invention being able to be applied as well, as will be understood, to intra-ear headphones.
  • 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 EP 2 597 889 A1 (Parrot ) describes such a headset, equipped with an ANC system combining feedback type filtering , closed loop, and feed- forward, open loop.
  • the feedback filtering channel is based on a signal collected by a microphone placed inside the acoustic cavity delimited by the shell of the earphone, the circumaural pad and the transducer.
  • this microphone is disposed near the ear of the user, and mainly receives 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 to collect spurious noise in the helmet wearer's immediate environment.
  • a third filtering channel processes the audio signal from the music source to be reproduced.
  • the output signals of the three filter channels are combined and applied to the transducer to reproduce the signal of the musical source associated with a surrounding noise canceling signal.
  • the EP 2 518 724 A1 (Parrot ) describes a device of the microphone / headset combined type, used in particular for hands-free telephony functions.
  • the helmet is provided with a physiological sensor applied against the cheek or temple of the wearer of the helmet and receiving vocal vibrations which have the characteristic of being, by nature, very little corrupted by the surrounding noise.
  • the physiological sensor may be in particular an accelerometer placed on the inside of the skin of the earpiece of the earphone of the helmet, so as to be pressed against the cheek or the temple of the user with as close a coupling as possible .
  • the signal thus collected allows, after filtering and combination with signals picked up by conventional external microphones, to deliver to the communication system a speech signal from the nearby speaker (the helmet wearer) whose intelligibility has been greatly improved.
  • Another advantage of this sensor is the ability to use the signal it delivers to calculate a cutoff frequency of a dynamic filter.
  • the WO 2010/129219 A1 ( EP 2 425 421 A0 ) describes another apparatus, comprising an ANC system of adaptive type, that is to say using filters whose transfer function is dynamically modified, continuously, by a real-time analysis algorithm of the signal.
  • An external microphone placed on the shell of the earphones of the headset collects ambient noise, the level of which is analyzed to adjust the transfer function of the feedback filter to adapt to the noise prevailing in the external environment of the headphones.
  • This phenomenon occurs in particular when handling the helmet, or when the user is walking heavily or short.
  • the movements of the helmet then create excessive overpressures and depressions in the front cavity, which results in a strong electrical peak in the low frequencies.
  • the excessive signal picked up by the microphone creates in the ANC feedback filter a saturation leading to an audible signal or "plop" produced at the output by the transducer and unpleasant for the user.
  • the feedback ANC filter can attenuate these pitch noise resonances by amplifying the internal microphone signal but, when the steps become stronger, the electrical level of the microphone signal can exceed the limits of its normal operation and cause, here again, a saturation ANC filter and transducer.
  • This saturation can occur at several points in the signal processing chain: electrical overshoot of the input dynamics of the analog / digital converter, exceeding of the maximum digital value in the digital signal processor DSP, or else output saturation if the signal reproduced by the transducer exceeds the maximum value that can be produced by the digital / analog converter, each of these phenomena can cause a "plop" unpleasant.
  • Another object of the invention is to implement a digital (and not an analogue) technology as in the EP 2 597 889 A1 mentioned above) for such an ANC system, which can be implemented in particular within a digital signal processor (DSP).
  • DSP digital signal processor
  • 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.
  • this example configuration of "headphone” type with a transducer housed in a shell surrounding the ear or resting on it should not be considered as limiting, the invention can also be well applied to ear-phones including an element to place in the ear canal, so headphones devoid of shell and cushion surrounding or covering the ear.
  • 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 20, 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 making it possible to obtain a reinforcement low frequencies in the front cavity 22 of the earpiece.
  • an internal microphone 28 disposed closer to the auditory canal of the ear, to capture the residual noise present in the internal cavity 22, which noise will be perceived by the user.
  • the neutralization of the noise by the sound wave 34 is never perfect, the internal microphone 28 collects a residual signal which is used as an error signal e applied to a feedback filter branch 36 closed loop.
  • an external microphone 38 may be placed on the shell of the earphones of the headset, to capture the surrounding noise outside the earpiece, schematized by the wave 30.
  • the signal collected by this external microphone 38 is applied to a feedforward 40 filter stage of the active noise control system.
  • the signals from the feedback branch 36 and, if present, from the feedforward branch 40 are combined at 42 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. Since this signal experiences the effects of the closed loop distorting it, it will have to be preprocessed by an equalization so as to present the desired transfer function, determined by the gain of the open loop and the target response without active control.
  • the helmet may possibly wear, as shown Figure 1 , another external microphone 44 for communication functions, for example if the headset is provided with "hands-free" telephony functions.
  • This additional external microphone 44 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 Next, it will be considered as an external microphone possibly used by the ANC system that the microphone 38 dedicated to active noise control.
  • the Figure 3 illustrates, in section, an exemplary embodiment of the various mechanical and electroacoustic elements schematically represented on the Figure 2 for one of the headphones 10 (the other headphone 10 'being made identically). It contains 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 28 carried by a gate 48 maintaining it nearby. of the ear canal of the user.
  • the object of the invention is to overcome the phenomenon, explained in the introduction, resulting from the sudden surges / depressions in the front cavity 22 which are likely to produce, especially in the low frequencies below 100 Hz, extreme overruns in the value the signal delivered by the internal microphone 28.
  • the Figure 4 illustrates an example of a signal delivered by the internal microphone 28, in this case an electret microphone which delivers a signal not exceeding 100 mV for a sound pressure of 110 dB SPL (Sound Pressure Leve /).
  • this value can be very much exceeded (in the example, it reaches and exceeds 600 mV), which can produce after amplification saturation effects in several places of the chain treatment.
  • the basic idea of the invention is to detect upstream of the feedback filter , with a very low latency time, the situations likely to produce such signal peaks, in order to avoid all saturation phenomena during sudden movements. helmet, especially while the user is walking or running.
  • the Figure 5 schematically illustrates, in the form of functional blocks, the active noise control system ANC incorporating, according to the invention, an anti-saturation function to compensate for this phenomenon.
  • the feedback branch whose principle was described above with reference to the Figure 2 after scanning by means of an ADC converter 52 of the error signal e picked up by the internal microphone 28.
  • the digitized error signal is processed by a feedback filter 54, then converted into analog by the DAC 56 to be returned by the transducer 18 in the cavity of the earpiece 10.
  • the reproduced signal is optionally combined with a music signal M which, after equalization at 58, is combined at 60 with the noise cancellation signal for conversion by the DAC 56 and reproduction by the transducer 18.
  • the filtering operated by the blocks 54 (transfer function H feedback FB2 on the microphone signal) and 58 (transfer function H equalizer EQ2 music M) can be realized in particular as described in the application FR 14 53284 of 11.04.2014, in the name of the Applicant, entitled “Active noise control ANC noise headphones with electric breath reduction”, which proposes to implement a plurality of predetermined filter configurations, selectively switchable according to the signal captured by the internal microphone 28, so as to optimize the compromise between the more or less attenuation of the ambient noise and that of an electric breath also more or less strong, depending on the level and the spectral content of the signal returned to the user as collected by the microphone 28 placed in the front cavity 22 of the earpiece.
  • the active noise control ANC is controlled by an ANC module 62 which analyzes the signal e and adapts accordingly the transfer functions H FB2 of the feedback branch 54 and H EQ2 of the equalization branch 58 of the music signal.
  • the active noise control processing ANC uses an accelerometer 64 mounted on the helmet ( Figures 2 and 5 ), the role of which will be to detect with a very low latency the movements of the earphone likely to produce saturation effects of the signal picked up by the internal microphone 28, typically movements resulting from the movements of the user while the latter walk, short, jump ... or when it manipulates the headphones, for example to readjust their position on his ears.
  • the EP 2 518 724 A1 (Parrot ) describes a headset with an accelerometer built into an earpiece, but in this document the accelerometer is used as a physiological sensor to collect voice components non-acoustically transmitted by bone conduction, so not noisy, a speech signal emitted by the user, for example in the case where the headset is used as a "hands-free" device in combination with a mobile phone.
  • this same accelerometer can be used, but with a different role, namely the improvement of the ANC function of the headphones, in a configuration of listening (sound reproduction) and not of speech (voice of the user).
  • the signal of the accelerometer 64 after scanning by means of an ADC converter 66, is applied to an "anti-saturation" module 68 which also receives the signal e collected by the internal microphone 28, after scanning by the ADC converter 52 .
  • the two acceleration and microphonic signals are analyzed jointly by the anti-saturation module 68, which controls a filter 70 (transfer function H FB1 ) placed in the feedback branch upstream of the actual feedback filter (block 54, function transfer H FB2 ) , and likewise an equalization filter 72 (transfer function H EQ1 ) placed in the equalization branch upstream of the equalization filter (block 58, transfer function H EQ2 ) .
  • the anti-saturation module 68 from these signals, defines the one of the X filters of the block 70 of the feedback branch that should be selected and, likewise, that of the Y filters of the block 72 of the equalization branch of the a music signal that should be selected ( Y can be equal to X, but not necessarily).
  • the selection between the X filters of the transfer function H FB1 of the block 70 (or Y filters of the transfer function H EQ1 of the block 72) is as follows.
  • IIR infinite impulse response filter
  • the Figure 6 illustrates more precisely the elements implemented by the anti-saturation module 68 for the analysis of the signal and the selection of the filters of the blocks 70 and 72.
  • the digitized signal e collected by the internal microphone 28 is subjected to a frequency decomposition by a battery of filters 74 in order to calculate at 76 the energy Rms i of this signal e in each of its N frequency components.
  • Rms 1 may be the power of the microphone signal below 100 Hz
  • Rms 2 the signal power around 800 Hz, etc. which allows via spectral analysis to distinguish various significant situations: for example, for use of the headset in a noisy environment of transportation type (plane, train), the ratio between low and high frequencies is much greater than in an environment quieter as in an office.
  • the obtained values Rms 1 , Rms 2 ... Rms N are applied to a state machine 78, which compares these energy values with respective thresholds and determines, according to these comparisons, that of the X filters of the block 70 of the branch feedback and if appropriate (if music is present) that of Y filters block 72 of the equalization branch to be selected.
  • the Figure 7 illustrates more precisely how this state machine operates 78.
  • the power RMS acc of the signal of the accelerometer present on the helmet is, possibly after prefiltering, analyzed constantly. If this power exceeds a predetermined threshold Seuil_a (test 80) then the state machine considers that the headset undergoes a movement likely to cause saturation of the ANC control and triggers an anti-saturation control process, corresponding to the left side of the algorithm of the Figure 7 .
  • the state machine In the presence of an acceleration exceeding the prescribed threshold, the state machine analyzes the signal of the internal microphone 28. If the power RMS 1 (power of the microphonic signal in a certain frequency range) exceeds a predetermined threshold Threshold_1 (test 82) , then the state machine modifies the transfer function H FB1 of the feedback branch , for example by selecting one of the X filters which has the effect of reducing the attenuation ANC in the low frequencies, and also modifies the function of H EQ1 transfer of the equalizer branch to keep the same perception of the music (block 84).
  • Threshold_1 test 82
  • the RMS power 2 of the microphonic signal in another frequency band is tested in the same way (block 82 ') with respect to a second threshold Threshold_2 (with Threshold_2 ⁇ Threshold_1 ) . If RMS 2 > Threshold_2, then a modification of the transfer functions H FB1 and H EQ1 (block 84 ') is also applied, typically with an attenuation of the feedback ANC present, but less important than in the previous case.
  • test 82 iteratively with progressively lower thresholds, so as to choose, among the X selectable filters of the feedback branch H FB1 , that which will optimize the compromise between the attenuation of the ANC control and protection against saturation of it (block 84 ").
  • the state machine disables the anti-saturation modules 70 and 72 (block 88).
  • test 80 Assuming that, in test 80, the signal analysis of the accelerometer indicates that it does not exceed the prescribed threshold, if the anti-saturation treatment was active (test 90), then at the expiration of a timer of X1 seconds (test 92), this control is automatically deactivated by the state machine (block 94).
  • the Figures 8 and 9 illustrate two examples of transfer functions H FB1 applied to the feedback branch of the control ANC, without (A) and with (B) modification by the anti-saturation module 68: the Figure 8 represents, in amplitude and in phase, the transfer function H FB1 in these two cases, while the Figure 9 illustrates the corresponding attenuations obtained. It is found that the detection of an acceleration triggers an attenuation of the gain of the feedback ANC branch of the order of 12 to 15 dB at 40 Hz between the curve A (without anti-saturation control) and the curve B (with anti-control -saturation). The change is mainly made in the low frequencies, below 150 Hz, because it is in this range of frequencies that the resonances of footsteps, etc. are located.
  • the anti-saturation control decreases, certainly, the attenuation performance of the ANC control but, in return, avoids the production of a very unpleasant "plop" output by the transducer due to the saturation of the control branch ANC feed -back.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Headphones And Earphones (AREA)
EP15166492.7A 2014-05-16 2015-05-06 Audiokopfhörer mit aktiver anc-geräuschkontrolle mit vorbeugung gegen sättigungseffekte eines feedback-mikrophonsignals Not-in-force EP2945399B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1454406A FR3021180B1 (fr) 2014-05-16 2014-05-16 Casque audio a controle actif de bruit anc avec prevention des effets d'une saturation du signal microphonique "feedback"

Publications (2)

Publication Number Publication Date
EP2945399A1 true EP2945399A1 (de) 2015-11-18
EP2945399B1 EP2945399B1 (de) 2016-10-12

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EP15166492.7A Not-in-force EP2945399B1 (de) 2014-05-16 2015-05-06 Audiokopfhörer mit aktiver anc-geräuschkontrolle mit vorbeugung gegen sättigungseffekte eines feedback-mikrophonsignals

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US (1) US9466281B2 (de)
EP (1) EP2945399B1 (de)
JP (1) JP2015219527A (de)
CN (1) CN105100990A (de)
FR (1) FR3021180B1 (de)

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EP3171612A1 (de) 2015-11-19 2017-05-24 Parrot Drones Audio-headset mit aktiver geräuschkontrolle, anti-okklusionskontrolle und löschung der passiven schalldämpfung je nach vorliegen oder nicht-vorliegen einer stimmaktivität des headset-benutzers
US9973870B2 (en) 2014-05-20 2018-05-15 Bugatone Ltd. Aural measurements from earphone output speakers
US10097914B2 (en) 2016-05-27 2018-10-09 Bugatone Ltd. Determining earpiece presence at a user ear
US10187719B2 (en) 2014-05-01 2019-01-22 Bugatone Ltd. Methods and devices for operating an audio processing integrated circuit to record an audio signal via a headphone port
GB2589802A (en) * 2014-12-01 2021-06-09 Soundchip Sa Earphone system
US11178478B2 (en) 2014-05-20 2021-11-16 Mobile Physics Ltd. Determining a temperature value by analyzing audio
CN114501291A (zh) * 2022-02-25 2022-05-13 深圳市豪恩声学股份有限公司 耳机抗干扰测试方法及装置

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US20170110105A1 (en) 2015-10-16 2017-04-20 Avnera Corporation Active noise cancelation with controllable levels
CN106643454A (zh) * 2016-12-05 2017-05-10 中国空间技术研究院 一种兼容高频高压反馈的电容式检驱一体化电路
WO2018163423A1 (ja) 2017-03-10 2018-09-13 ヤマハ株式会社 ヘッドフォン
CN109729471A (zh) * 2017-10-27 2019-05-07 北京金锐德路科技有限公司 用于脖戴式语音交互耳机的anc降噪装置
WO2019134115A1 (zh) * 2018-01-05 2019-07-11 万魔声学科技有限公司 主动降噪方法、设备及耳机
CN108540887B (zh) * 2018-05-21 2019-12-20 歌尔股份有限公司 一种头戴式降噪耳机和降噪处理方法
JP7119210B2 (ja) 2018-08-02 2022-08-16 ドルビー ラボラトリーズ ライセンシング コーポレイション 能動ノイズ制御システムの自動較正
EP3742754B1 (de) * 2019-05-24 2023-09-27 Honeywell International Inc. Gehörschutzvorrichtungen, lautsprecher und lärmbelastungssensoren dafür sowie sensorgehäuse und zugehörige verfahren dafür
JPWO2022137654A1 (de) 2020-12-25 2022-06-30
WO2023274525A1 (en) * 2021-06-30 2023-01-05 Huawei Technologies Co., Ltd. Active noise reduction headphones and method
US11589154B1 (en) * 2021-08-25 2023-02-21 Bose Corporation Wearable audio device zero-crossing based parasitic oscillation detection
CN114501221B (zh) * 2022-02-28 2024-07-02 歌尔股份有限公司 耳机降噪方法、装置、耳机设备及存储介质

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WO2010129219A1 (en) 2009-04-28 2010-11-11 Bose Corporation Anr with adaptive gain
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WO2011157856A2 (en) * 2011-10-19 2011-12-22 Phonak Ag Microphone assembly
EP2597889A1 (de) 2011-11-22 2013-05-29 Parrot Kopfhörer mit nicht-adaptives aktiven Geräuschkontrolle

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10187719B2 (en) 2014-05-01 2019-01-22 Bugatone Ltd. Methods and devices for operating an audio processing integrated circuit to record an audio signal via a headphone port
US9973870B2 (en) 2014-05-20 2018-05-15 Bugatone Ltd. Aural measurements from earphone output speakers
US11178478B2 (en) 2014-05-20 2021-11-16 Mobile Physics Ltd. Determining a temperature value by analyzing audio
GB2589802A (en) * 2014-12-01 2021-06-09 Soundchip Sa Earphone system
GB2589802B (en) * 2014-12-01 2021-09-15 Soundchip Sa Earphone system
EP3171612A1 (de) 2015-11-19 2017-05-24 Parrot Drones Audio-headset mit aktiver geräuschkontrolle, anti-okklusionskontrolle und löschung der passiven schalldämpfung je nach vorliegen oder nicht-vorliegen einer stimmaktivität des headset-benutzers
US10097914B2 (en) 2016-05-27 2018-10-09 Bugatone Ltd. Determining earpiece presence at a user ear
US10334350B2 (en) 2016-05-27 2019-06-25 Bugatone Ltd. Identifying an acoustic signal for a user based on a feature of an aural signal
US10659867B2 (en) 2016-05-27 2020-05-19 Bugatone Ltd. Identifying an acoustic signal for a user based on a feature of an aural signal
CN114501291A (zh) * 2022-02-25 2022-05-13 深圳市豪恩声学股份有限公司 耳机抗干扰测试方法及装置
CN114501291B (zh) * 2022-02-25 2024-05-31 深圳市豪恩声学股份有限公司 耳机抗干扰测试方法及装置

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EP2945399B1 (de) 2016-10-12
FR3021180A1 (fr) 2015-11-20
FR3021180B1 (fr) 2016-06-03
CN105100990A (zh) 2015-11-25
US9466281B2 (en) 2016-10-11
US20150332662A1 (en) 2015-11-19

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