EP3979663A1 - Kopfhörer mit geräuschdämpfung - Google Patents

Kopfhörer mit geräuschdämpfung Download PDF

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Publication number
EP3979663A1
EP3979663A1 EP21200269.5A EP21200269A EP3979663A1 EP 3979663 A1 EP3979663 A1 EP 3979663A1 EP 21200269 A EP21200269 A EP 21200269A EP 3979663 A1 EP3979663 A1 EP 3979663A1
Authority
EP
European Patent Office
Prior art keywords
transfer function
noise
filter
microphone
secondary path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21200269.5A
Other languages
English (en)
French (fr)
Other versions
EP3979663B1 (de
Inventor
Vu Hoang Co Thuy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Devialet SA
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Devialet SA
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Filing date
Publication date
Application filed by Devialet SA filed Critical Devialet SA
Publication of EP3979663A1 publication Critical patent/EP3979663A1/de
Application granted granted Critical
Publication of EP3979663B1 publication Critical patent/EP3979663B1/de
Active legal-status Critical Current
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Classifications

    • 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
    • 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
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • 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
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17827—Desired external signals, e.g. pass-through audio such as music or speech
    • 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
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • 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
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • H04R3/00—Circuits for transducers
    • H04R3/04—Circuits for transducers for correcting frequency response
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • 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
    • H04R25/00—Electric hearing aids
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically

Definitions

  • the noise reduction audio headset comprises at least one microphone placed either inside the cavity between the electro-acoustic transducer and the auditory canal, or outside this cavity. Ideally, such a headset has microphones placed in both positions.
  • the signals coming from the two microphones are processed by digital filters which may be the combination of one or more filters.
  • Headsets with an internal microphone generally have good performance in terms of noise reduction level, commonly of the order of 20 to 30 dB, but in a limited frequency range, typically 50 to 1000 Hz, due to the instability of the feedback loop formed by the internal microphone and its filter directly receiving the signals emitted by the electro-acoustic transducer. This instability can cause feedback and the filters therefore have a range of action deduced to avoid this phenomenon.
  • Headsets with an external microphone do not have this restriction in terms of instability in that there is only a very attenuated signal of the order of 50 dB coming from the electro-acoustic transducer picked up by the external microphone. , which does not create feedback. They generally provide attenuations of up to only 10 dB, since the microphone favors a direction for picking up external noise coming towards the ear.
  • Earmuffs with an external microphone can theoretically attenuate noises above 1 kHz, but the performance is highly dependent on the direction of the noise source, especially at higher frequencies.
  • the filters used at the output of the external or internal microphones are designed to seek to overcome the problems previously mentioned, namely feedback for the internal microphones and reduced performance due to the strong directivity of the measurements in the case of the external microphone.
  • the object of the invention is to propose a solution to this problem of feedback for interior microphones, and of the difficulty of constructing a high-performance filter taking into account the directivity for external microphones while allowing the satisfactory frequency ranges of the reducer to be widened. noise.
  • the method comprises the measurement of the transfer function of the processed secondary path is carried out on a complete headset but devoid of the or each anti-noise processing filter by excitation of the transducer by a sinusoidal function of variable frequency over the entire audio range and measurement of the signal obtained on an artificial ear.
  • FIG. 1 schematically illustrated is a noise reduction headset 10.
  • It comprises a cavity 12 for sound reproduction inside which is schematized an ear 14 of the wearer of the helmet.
  • this cavity comprises an electro-acoustic transducer 16 arranged facing the auditory canal of the ear.
  • This cavity 12 is formed for example by a shell covering most of the ear in the case of an external audio headset or takes the form of an anatomical box that can be introduced into the entrance to the auditory canal in the case of an in-ear headphone.
  • the transducer 16 is connected, for its excitation, to an amplifier 18, assumed to have unity gain, receiving a digital signal to be reproduced through a digital/analog converter 20.
  • the headphones have an input 22 for a musical signal to be reproduced connected to the input of the digital/analog converter 20 through an equalization filter 24.
  • the helmet 10 comprises an internal anti-noise treatment chain 30 comprising an internal microphone 31 arranged inside the cavity 12 facing the electro-acoustic transducer 16.
  • the external microphone 31 is capable of picking up the sound produced by the transducer 16 and the external noise at the level of the outer envelope of the cavity 12, denoted bext, filtered by the cavity 12 whose transfer function is denoted HPA.
  • the path formed between the transducer 16 and the user's eardrum is called the “secondary path” and its transfer function is denoted Ha.
  • the transfer function between the measurement point of the internal microphone 31 and the eardrum is denoted Hmici-t.
  • Hmici-t The transfer function between the transducer 16 and the measurement point of the microphone 31 is equal to Ha/Hmici-t.
  • Hmici-t the distance between the internal microphone 31 and the eardrum being very small, Hmici-t is substantially equal to 1. Consequently, it is considered in practice and in the rest of the document that the transfer function of the secondary path and the transfer function between the transducer 16 and the measurement point of the internal microphone 31 are both equal to Ha.
  • the microphone 31 is connected, in the chain 30, to an internal signal processing filter 34 capable of supplying an anti-noise signal, with the interposition of an analog/digital converter 32.
  • the output of the internal processing filter 34 is connected to the amplifier 18 through an adder 38 arranged upstream of the digital/analog converter 20. This adder ensures the addition of the equalized signals coming from the input 22 and the signals anti-noise from the internal processing chain 30.
  • the headset 10 includes an external noise-cancelling processing chain 40 including an external microphone 41 installed outside the cavity 12.
  • the external microphone 41 is capable of picking up the external noise bext affected by a transfer function Hbext.
  • Hbext is the transfer function between the external surface of the cavity 12 where the external noise bext applies and the external microphone 41, as illustrated in the figure 1 .
  • the external microphone 41 is connected through an analog/digital converter 42 to an external processing filter 44 whose output is connected to the adder 38.
  • the adder 38 thus ensures a routing to the amplifier 18, through the analog/digital converter 20, of the anti-noise signals produced at the output of the filters 34 and 44 and of the equalized musical signal to be reproduced from the input 22.
  • the filters and equalizers described here are digital filters implemented in a digital signal processor (DSP).
  • DSP digital signal processor
  • the helmet 10 comprises the two internal 30 and external 40 anti-noise treatment chains or either the internal 30 anti-noise treatment chain or the external 40 anti-noise treatment chain is eliminated and only one of the two associated microphones and filters is retained.
  • the transfer function of the processed secondary path is the transfer function of the secondary path affected by the transfer functions of the various components ensuring the processing up to the transducer 16, with the exception of the internal 34 or external 44 processing filter depending on the case.
  • it is in particular the transfer functions of the microphone 31 or 41 depending on the case, of the analog/digital converter 32 or 42 depending on the case and of the digital/analog converter 20.
  • the amplifier 18 is assumed to be unitary and if such n is not the case, its transfer function is also integrated into the transfer function of the secondary path processed.
  • the inverse of the transfer function of the processed secondary path is applied by a stabilization filter denoted respectively 34A and 44A for the filters 34 and 44.
  • These filters 34A, 34B have a stabilization transfer function denoted HFBcorr and HFFcorr respectively.
  • Each stabilization filter 34A, 44A is followed, at the output, respectively in the processing filter 34, 44, by a noise cancellation filter 34B, 44B whose transfer function is denoted respectively HFB2, HFF2.
  • the digital filters 34A, 44A and 34B, 44B used are for example infinite impulse response (IIR) filters or finite impulse response (FIR) filters.
  • HPA the transfer function s/bext in the absence of an active noise reduction device, in other words, it is the passive attenuation of the cavity, bext being the ambient noise on the external envelope of this cavity.
  • This HPA transfer function is generally close to a low-pass filter, which means that the structure forming the cavity mainly reduces high frequencies.
  • a stabilization filter 34A is then constructed, with a transfer function HFBcorr reproducing as faithfully as possible the transfer function PlantFB -1 .
  • the stabilization filter 34A is constructed so that its transfer function is substantially equal to the inverse of the transfer function of the secondary path, over the entire audio range, and in particular from 5 Hz to 50 Hz and from 1 kHz to 10 kHz, to within an error on the gain of 5 dB, advantageously of 1 dB, and with a phase shift of +45 to -45° on the corrected phase of the linear phase due to the pure delay resulting from the propagation in air and processor delay.
  • the filter is programmed and implemented in the digital signal processor (DSP). It is advantageously produced by a combination of several cascaded filters.
  • DSP digital signal processor
  • the action of the stabilization filter 34A is applied over the entire range of frequencies authorized by the sampling frequency (Fs) of the digital signal processor (DSP).
  • Fs sampling frequency
  • DSP digital signal processor
  • the second part of the filter 34 consisting of the noise cancellation filter 34B with transfer function HFB2, is designed so that stability is ensured for all frequencies, while applying the highest possible gain in the audio band and in particular greater than 20dB to provide maximum noise cancellation performance.
  • the filter 34B is advantageously formed of a proportional integral (PI) filter or of a stepped filter known under the terms of shelving filter in English.
  • phase of the denominator is only dependent on a pure delay, which is the sum of the time T FB of physical propagation of the acoustic wave and the time D FB of processing of the digital signal processor (DSP in English), and the phase of the noise cancellation filter HFB2 pushing back into the frequency band, a cancellation of the denominator, which is at the origin of the feedback. This is thus avoided, even if the anti-noise has a high gain over a wide frequency range.
  • the actual HFBcorr transfer function of the implemented stabilization filter 34A is shown as a dotted line. These two curves are very close as explained previously.
  • HFF HFFcorr * HFF2
  • PlantFF Gadce * gdac * Hmice * Ha
  • the filter 44A one proceeds first, on a complete helmet in the absence of the internal processing filter 44, to the measurement of the transfer function PlantFF of the secondary path processed by subjecting the transducer 16 to a variable frequency sweeping the audio range and measuring the signal obtained by an artificial ear 14
  • the stabilization filter 44A is constructed so that, as in the previous embodiment, its transfer function is substantially equal to the inverse of the transfer function of the secondary path, from 5 Hz to 50 Hz and from 1 kHz to 10 kHz, and advantageously over the entire audio range, to within an error on the gain of 5 dB, advantageously 1 dB, and with a phase shift of +45 to -45° on the phase without taking the phase into account linear due to the pure delay resulting from the propagation in the air and the delay due to the processor.
  • HFB HFBcorr * HFB 2

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Headphones And Earphones (AREA)
EP21200269.5A 2020-10-01 2021-09-30 Kopfhörer mit geräuschreduzierung Active EP3979663B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2010064A FR3114935B1 (fr) 2020-10-01 2020-10-01 Casque audio à réducteur de bruit

Publications (2)

Publication Number Publication Date
EP3979663A1 true EP3979663A1 (de) 2022-04-06
EP3979663B1 EP3979663B1 (de) 2024-07-17

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EP21200269.5A Active EP3979663B1 (de) 2020-10-01 2021-09-30 Kopfhörer mit geräuschreduzierung

Country Status (4)

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US (1) US11678105B2 (de)
EP (1) EP3979663B1 (de)
CN (1) CN114268869B (de)
FR (1) FR3114935B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115567843B (zh) * 2022-09-27 2026-02-10 立讯精密科技(南京)有限公司 具有扬声器的头戴装置及其信号处理方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1923864A2 (de) * 2006-11-14 2008-05-21 Sony Corporation Rauschreduzierende Vorrichtung, rauschreduzierendes Verfahren, rauschreduzierendes Programm und rauschreduzierende Audio-Ausgabevorrichtung
US20090080670A1 (en) * 2007-09-24 2009-03-26 Sound Innovations Inc. In-Ear Digital Electronic Noise Cancelling and Communication Device
US20100274369A1 (en) * 2009-04-28 2010-10-28 Kabushiki Kaisha Toshiba Signal processing apparatus, sound apparatus, and signal processing method
EP2830324A1 (de) * 2013-07-23 2015-01-28 Sennheiser electronic GmbH & Co. KG Kopfhörer und Headset

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108140380B (zh) * 2015-08-20 2022-05-27 思睿逻辑国际半导体有限公司 具有部分地由固定响应滤波器提供的反馈响应的自适应消噪反馈控制器及方法
FR3044197A1 (fr) * 2015-11-19 2017-05-26 Parrot Casque audio a controle actif de bruit, controle anti-occlusion et annulation de l'attenuation passive, en fonction de la presence ou de l'absence d'une activite vocale de l'utilisateur de casque.
DE112018000717T5 (de) * 2017-02-14 2020-01-16 Avnera Corporation Verfahren, vorrichtungen, anordnungen und komponenten zur aktivitätsermittlung von nutzerstimmaktivität
CN108540895B (zh) * 2018-07-17 2019-11-08 会听声学科技（北京）有限公司 智能均衡器设计方法及具有智能均衡器的降噪耳机

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1923864A2 (de) * 2006-11-14 2008-05-21 Sony Corporation Rauschreduzierende Vorrichtung, rauschreduzierendes Verfahren, rauschreduzierendes Programm und rauschreduzierende Audio-Ausgabevorrichtung
US20090080670A1 (en) * 2007-09-24 2009-03-26 Sound Innovations Inc. In-Ear Digital Electronic Noise Cancelling and Communication Device
US20100274369A1 (en) * 2009-04-28 2010-10-28 Kabushiki Kaisha Toshiba Signal processing apparatus, sound apparatus, and signal processing method
EP2830324A1 (de) * 2013-07-23 2015-01-28 Sennheiser electronic GmbH & Co. KG Kopfhörer und Headset

Also Published As

Publication number Publication date
FR3114935B1 (fr) 2022-12-09
CN114268869B (zh) 2025-10-28
CN114268869A (zh) 2022-04-01
EP3979663B1 (de) 2024-07-17
FR3114935A1 (fr) 2022-04-08
US11678105B2 (en) 2023-06-13
US20220124431A1 (en) 2022-04-21

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