EP3614689A1 - Écouteur anc - Google Patents

Écouteur anc Download PDF

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Publication number
EP3614689A1
EP3614689A1 EP18189719.0A EP18189719A EP3614689A1 EP 3614689 A1 EP3614689 A1 EP 3614689A1 EP 18189719 A EP18189719 A EP 18189719A EP 3614689 A1 EP3614689 A1 EP 3614689A1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
anc
headphones
microphone
impedance
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.)
Withdrawn
Application number
EP18189719.0A
Other languages
German (de)
English (en)
Inventor
Bernhard Pinter
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.)
Austrian Audio GmbH
Original Assignee
Austrian Audio GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Austrian Audio GmbH filed Critical Austrian Audio GmbH
Priority to EP18189719.0A priority Critical patent/EP3614689A1/fr
Priority to US16/541,051 priority patent/US11189260B2/en
Publication of EP3614689A1 publication Critical patent/EP3614689A1/fr
Withdrawn legal-status Critical Current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; 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
    • 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
    • G10K11/1781—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
    • 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
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • 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
    • H04R1/1016—Earpieces of the intra-aural type
    • 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
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3026—Feedback
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3035—Models, e.g. of the acoustic system
    • G10K2210/30351—Identification of the environment for applying appropriate model characteristics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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; DEAF-AID SETS; 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
    • H04R2460/15—Determination of the acoustic seal of ear moulds or ear tips of hearing devices
    • 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

Definitions

  • the invention relates to an ANC headphone, which can also be part of a headset that is worn over or on the ear, or can be designed as in-ear headphones, in accordance with the introductory part of claim 1.
  • the loudspeaker or speakers, the microphone and the associated electronics are usually built into the headphone housing provided for this purpose.
  • the acoustic tuning must be done separately for each headphone housing, which means tests and a corresponding effort.
  • an ANC module also called an ANC component
  • this module optionally also having the microphone and electronics for active noise suppression and / or a data line for introducing the signal to be emitted acoustically and / or an energy supply or connections for such components.
  • This part of the ANC module is built into the headphones so that the front panel faces the user's ear when the headphones are used.
  • the invention relates to such modules as well as headphones that have such modules installed.
  • Such an ANC module which also represents an aspect of the invention, enables the impedance at the loudspeaker terminals, which changes when there is a change in relation to the starting situation, to be recognized and, depending on this, the parameters in the ANC loop accordingly be adapted for what models and control loops in electronics or their software are intended.
  • FIG. 1 shows the Fig. 1 , purely schematically, an ANC module according to the invention
  • the Fig. 2 an acoustic parameter model of the ANC module
  • the Fig. 3 a simulation of the frequency response with a front volume of 200 cm 3
  • the Fig. 4 an analog simulation of the frequency response with a front volume of 40 cm 3
  • the Fig. 5 a simulation of the frequency response of a headphone according to the prior art
  • the Fig. 6 an ANC block diagram regarding the feedback
  • the Fig. 7 the behavior of the frequency response when a leak occurs with original ideal tuning in the prior art
  • the Fig. 8 compared to the correction achieved according to the invention Fig. 7 ,
  • the microphone for the ANC loop can be part of the ANC module or can be mounted independently of it on the headphones, since the positioning of the microphone has no influence on the function of the ANC module. It is important that the impedance of the loudspeaker in this module reacts to leaks in the front volume or different wearing situations so that the state of the transmission path from the loudspeaker to the ANC microphone can be inferred. Even in the worst case scenario, it is possible for the listener's electronics to recognize when a certain leak has occurred and to switch off the ANC to protect the user before it becomes unstable.
  • the Fig. 1 shows, purely schematically, an ANC module according to the invention with an electrodynamic loudspeaker 1 which is arranged in a housing 14 which has an acoustically continuous front plate 16. An opening 15 is provided in the housing 4.
  • the electronics and the ANC microphone are located elsewhere in the headphones; if the headphones are also designed to transmit signals (voice, music, telephone, etc.), a data line according to the prior art is also provided, otherwise only the necessary compensation information led to the speaker 1 via a line (not shown).
  • the Fig. 2 shows an acoustic parameter model of an ANC module according to the invention:
  • the model shows the electrical feed by means of a generator via the coil 17.
  • the mechanical resonant circuit of the membrane and coil is simulated in FIG. This is coupled to the environment via the membrane surface 19.
  • Internal speaker geometries are shown at 20.
  • the pre-volume or the volume between loudspeaker and ear is shown at 21, which is short-circuited to ground via a simulated leak 22.
  • the back volume of the module is simulated in FIG. 23, which itself again via openings 24 (corresponds to opening 15 in FIG Fig.1 ) is connected to the free field (environment of the module).
  • the openings 24 In order to have a reaction of the leak 22 on the converter resonant circuit 18, the openings 24 must be matched accordingly or be open enough.
  • the Fig. 3 shows a simulation of the frequency response of a headphone according to the invention with an ANC module according to the invention with a front volume of 200 cm 3 .
  • the frequency response is plotted against the frequency on a logarithmic scale: the fully drawn line shows the completely open situation, the dotted line shows the completely closed situation and the dashed line shows a small leak.
  • the increase in the leak results in a significant increase in impedance in the range below 100 Hz. This can be measured and evaluated.
  • the increase in impedance in relation to the valley floor in the 70Hz range is + 25% for a small leak and + 44% for the completely open situation.
  • the Fig. 4 shows the frequency response with a front volume of only 40 cm 3 analogous to the situation of Fig. 3 , Here too you can see a significant increase in impedance by increasing the leakage below 100 Hz.
  • the increase in impedance in relation to the bottom of the valley is 150 Hz + 47% for a small leak and + 72% for the completely open situation.
  • the solid line shows the completely open situation
  • the dotted line shows the fully closed situation
  • the dashed line shows the situation with a small leak.
  • the Fig. 5 represents the frequency response of an otherwise identical headphone according to the state of the art.
  • the solid line shows the completely open situation
  • the dotted line shows the fully closed situation
  • the dashed line shows the situation with a small leak.
  • the Fig. 6 is a block diagram of the feedback loop used according to the invention: the sound of a loudspeaker 1 is superimposed by an interference signal 2 coming from outside, which picks up the feedback microphone 3 and forwards it to a feedback filter 4.
  • the corresponding secondary path 25 is shown between loudspeaker 1 and feedback microphone 3.
  • An ideal feedback filter is calculated by means of electronics known from the prior art and a corresponding signal is passed on to loudspeaker 1. Any audio signal to be emitted is indicated purely schematically by the arrow in the filter 4, because it is not essential to the invention.
  • the evaluation of the impedance response of the loudspeaker in the evaluation unit 5 leads to an adaptation of the feedback filter 4.
  • This adaptation can vary depending on the recognizable wearing situation and / or the desired behavior. For example, individual filter groups can be changed or deactivated. A reduction in the total loop gain or a complete deactivation of the loop is also conceivable or feasible. Knowing the invention and the field of application, it is easy for a person skilled in the field of ANC headphones to take the appropriate precautions here.
  • the evaluation unit 5 can react to the change in the impedance in different ways and is not part of this invention.
  • An example would be to react to the impedance level and to deactivate / bypass a filter stage when a limit value is reached or exceeded, as with the Fig. 8 explained.
  • Figs. 7 and 8th show the frequency response, both amplitude and phase, with 11 and 11 'indicating the stability limit for the closed control loop, 9 and 9' the secondary path in the leaky state, 10 and 10 'the secondary path in the tight state, 7 and 7' the ideal State-of-the-art feedback filter.
  • the Fig. 7 shows the tight and leaky wearing situation shown in the secondary section with lines 10 and 9. If you put the ideal filter 7 (according to the state of the art, therefore ideally matched with a perfect fit) over it, you get the course 6 and it in the tight wearing situation no problem can be identified.
  • the control loop is thus stable.
  • the control loop is therefore unstable.
  • Fig. 8 analogous to Fig. 7 the tight and leaky wearing situation with the ideal filter (according to the state of the art) which leads to courses 6 and 8 as well as the adapted filter according to the invention which leads to courses 12 and 13.
  • the control loop with the adapted filter is thus stable again!
  • the curves with the ideal filter 6, 6 'and 8, 8' according to the prior art are also entered for comparison.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP18189719.0A 2018-08-20 2018-08-20 Écouteur anc Withdrawn EP3614689A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18189719.0A EP3614689A1 (fr) 2018-08-20 2018-08-20 Écouteur anc
US16/541,051 US11189260B2 (en) 2018-08-20 2019-08-14 Active noise-cancelling headphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18189719.0A EP3614689A1 (fr) 2018-08-20 2018-08-20 Écouteur anc

Publications (1)

Publication Number Publication Date
EP3614689A1 true EP3614689A1 (fr) 2020-02-26

Family

ID=63363892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18189719.0A Withdrawn EP3614689A1 (fr) 2018-08-20 2018-08-20 Écouteur anc

Country Status (2)

Country Link
US (1) US11189260B2 (fr)
EP (1) EP3614689A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11115749B2 (en) 2018-09-07 2021-09-07 Austrian Audio Gmbh In-ear active noise-cancelling earphone
EP3905721A1 (fr) 2020-04-27 2021-11-03 Jacoti BV Procédé d'étalonnage d'un dispositif de traitement audio de niveau d'oreille
CN114040284B (zh) * 2021-09-26 2024-02-06 北京小米移动软件有限公司 噪声的处理方法、噪声的处理装置、终端及存储介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110116643A1 (en) * 2009-11-19 2011-05-19 Victor Tiscareno Electronic device and headset with speaker seal evaluation capabilities
EP3001695A1 (fr) * 2014-09-29 2016-03-30 Harman Becker Automotive Systems GmbH Ecouteurs actifs avec contrôle de l'utilisation d'énergie
US9894452B1 (en) * 2017-02-24 2018-02-13 Bose Corporation Off-head detection of in-ear headset

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US5182774A (en) 1990-07-20 1993-01-26 Telex Communications, Inc. Noise cancellation headset
KR20080105813A (ko) 2007-06-01 2008-12-04 엘지전자 주식회사 귓속 음성 송수신 장치
US8385560B2 (en) 2007-09-24 2013-02-26 Jason Solbeck In-ear digital electronic noise cancelling and communication device
US8737636B2 (en) * 2009-07-10 2014-05-27 Qualcomm Incorporated Systems, methods, apparatus, and computer-readable media for adaptive active noise cancellation
US8755558B2 (en) 2010-03-18 2014-06-17 Panasonic Corporation Speaker, hearing aid, earphone, and portable terminal device
US9357283B2 (en) 2011-03-07 2016-05-31 Soundchip Sa Earphone apparatus
JP2014155145A (ja) 2013-02-13 2014-08-25 Funai Electric Co Ltd イヤホンマイク
JP2015023495A (ja) 2013-07-22 2015-02-02 船井電機株式会社 イヤホンマイク
KR101469908B1 (ko) 2013-08-21 2014-12-08 크레신 주식회사 이어폰
US20160330546A1 (en) * 2015-05-06 2016-11-10 Aliphcom Headset with leakage detection
US10075783B2 (en) * 2016-09-23 2018-09-11 Apple Inc. Acoustically summed reference microphone for active noise control
US11115749B2 (en) 2018-09-07 2021-09-07 Austrian Audio Gmbh In-ear active noise-cancelling earphone

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110116643A1 (en) * 2009-11-19 2011-05-19 Victor Tiscareno Electronic device and headset with speaker seal evaluation capabilities
EP3001695A1 (fr) * 2014-09-29 2016-03-30 Harman Becker Automotive Systems GmbH Ecouteurs actifs avec contrôle de l'utilisation d'énergie
US9894452B1 (en) * 2017-02-24 2018-02-13 Bose Corporation Off-head detection of in-ear headset

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Publication number Publication date
US20200058287A1 (en) 2020-02-20
US11189260B2 (en) 2021-11-30

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