EP1748678B1 - Appareil auditif et procédé pour la réduction des rétroactions - Google Patents

Appareil auditif et procédé pour la réduction des rétroactions Download PDF

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Publication number
EP1748678B1
EP1748678B1 EP06117366A EP06117366A EP1748678B1 EP 1748678 B1 EP1748678 B1 EP 1748678B1 EP 06117366 A EP06117366 A EP 06117366A EP 06117366 A EP06117366 A EP 06117366A EP 1748678 B1 EP1748678 B1 EP 1748678B1
Authority
EP
European Patent Office
Prior art keywords
sound
microphone
loudspeaker
location
hearing device
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.)
Not-in-force
Application number
EP06117366A
Other languages
German (de)
English (en)
Other versions
EP1748678A3 (fr
EP1748678A2 (fr
Inventor
Eghart Fischer
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.)
Sivantos GmbH
Original Assignee
Siemens Audioligische Technik GmbH
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Filing date
Publication date
Application filed by Siemens Audioligische Technik GmbH filed Critical Siemens Audioligische Technik GmbH
Publication of EP1748678A2 publication Critical patent/EP1748678A2/fr
Publication of EP1748678A3 publication Critical patent/EP1748678A3/fr
Application granted granted Critical
Publication of EP1748678B1 publication Critical patent/EP1748678B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
    • 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
    • H04R2460/11—Aspects relating to vents, e.g. shape, orientation, acoustic properties in ear tips of hearing devices to prevent occlusion
    • 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
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones
    • H04R29/005—Microphone arrays
    • H04R29/006—Microphone matching

Definitions

  • the present invention relates to a hearing apparatus and method for reducing feedback between a loudspeaker and a plurality of microphones.
  • the present invention particularly relates to a corresponding hearing aid.
  • the device has an additional handset, which is arranged in a ventilation channel.
  • This additional receiver is located approximately in the middle of the ventilation channel and symmetrically in the ventilation channel are two microphones.
  • One of the two microphones and the handset serve to avoid direct sound entering the ear canal, and the other microphone, together with the handset, serves to avoid feedback.
  • A1 is a hearing aid with a microphone, an amplifier and a receiver that passes amplified sound to the user known.
  • a second signal path is provided with a feedback suppressing microphone which is located at a location where it receives sound from the receiver causing the feedbacks.
  • the output of this microphone is correspondingly attenuated and delayed by a time P corresponding to the effective acoustic distance between the second and the main microphone. In this way, the signal component in the signal from the main microphone that can achieve feedback or whistling can be substantially eliminated.
  • the feedback cancellation arrangement comprises two microphones as well as a loudspeaker.
  • the object of the present invention is thus to propose a hearing device with a low tendency to feedback, wherein the directional effect of the pinna is exploited and an open supply is to be ensured.
  • this object is achieved by a hearing device according to claim 1.
  • the invention provides a method according to claim 5.
  • the hearing device is designed as a hearing aid.
  • the tubular earmold is, for example, part of an otoplastic for a BTE or part of an ITE (in-the-ear hearing device).
  • the hearing device has an amplifying device, with which a sound which penetrates from the outside into the earmold can be amplified differently than a sound originating from the loudspeaker.
  • a corresponding signal processing unit is included in the amplification device, which separates the individual sound sources, so that feedback as far as possible is prevented.
  • An advanced hearing device has a third microphone, so that sound that is reflected by an eardrum can be clearly recognized.
  • This third microphone is accordingly placed in the ear canal or the earmold, so that the microphones receive a directivity in the direction of the auditory canal axis. As a result, it can be calculated from which direction the sound comes.
  • the hearing device has a tubular earmold OP.
  • This earmold OP has at its end faces in each case an opening 01, 02.
  • a loudspeaker LS is located centrally. Its main emission direction is perpendicular to the axis of the earmold OP.
  • Acoustically symmetrical to the loudspeaker LS two microphones M1 and M2 are arranged inside the earmold OP. Acoustically symmetric means the sound from the loudspeaker LS to the microphone M1 is subjected to the same transfer function as the sound from the loudspeaker LS to the microphone M2.
  • Propagation directions of the sound from the speaker LS are indicated by simple arrows.
  • FIG. 1 Furthermore, a geometric line of symmetry GS is shown, which is defined by the loudspeaker LS and to which the microphones M1 and M2 are arranged symmetrically.
  • the acoustic symmetry differs slightly from the geometric symmetry, since the hearing device or the earmold OP is located in an ear canal GG, which is completed by an eardrum TF. This results in a closed space at one end of the earmold OP, while the space at the other end of the earmold OP is open.
  • This asymmetry requires a geometric asymmetry of the locations of the microphones M1, M2 with respect to the loudspeaker LS.
  • the amplitude and phase response of the sound from the loudspeaker LS are then the same in the acoustically symmetrical arrangement in both microphones M1 and M2.
  • the microphones M1 and M2 are in FIG. 1 geometrically symmetrically drawn.
  • the specific arrangement of the two microphones M1, M2 and the handset or loudspeaker LS in the tubular earmold OP makes it possible to use signal processing algorithms which avoid the occurrence of feedback despite - or precisely because of - the spatial proximity of microphone and loudspeaker.
  • the cause lies in particular in the clear definition of the feedback path.
  • the principle according to the invention thus consists in symmetrically arranging a plurality of microphones in an earmold piece which is open on both sides.
  • a similar type of processing will now be applied to the applied by the microphones M1 and M2 obtained microphone signals. Since there are no further sound sources within the tube of the earmold OP, the sound from the loudspeaker LS can be influenced by external sound or useful sound (see double arrows in FIG FIG. 1 ). Often, the sound from the speaker can be largely removed from the overall signal being processed and amplified.
  • FIG. 2 shows the directional characteristic RC of the microphone array of FIG. 1 for the center of the earmold OP, in which the loudspeaker LS is located. This results in the highest attenuation in the 90 ° or 270 ° direction in which the loudspeaker LS is located or from which the sound of the loudspeaker arrives. The useful sound, however, which arrives from the 0 ° direction is recorded almost undamped.
  • This directional characteristic RC is in FIG. 1 also indicated in the middle of the earmold.
  • FIG. 1 is also the entire signal processing, as is typical for a hearing aid indicated. Accordingly, the signals of the microphones M1 and M2 are subjected to a so-called microphone matching MM, in which an adaptation of the amplitude and phase response of the signals takes place.
  • a downstream signal processing algorithm SA which also uses the signal of the microphone M1 for processing, generates the desired directivity. The resulting signal is supplied via a low-pass filter LP and a signal processor SP to the loudspeaker LS.
  • the microphone matching unit MM adjusts the amplitude and phase responses of the microphone signals to each other or notes their differences.
  • the signal processing algorithm SA can then be used to remove signals which have a running direction from the eardrum TF to the outwardly directed opening 01 of the earmold OP, from the useful signal. For this purpose, at least three microphone input signals are necessary.
  • the loudspeaker LS is then supplied with the reflection-free useful signal.
  • FIG. 4 again shows the directional characteristic RC of the microphone assembly of the hearing of FIG. 3 , Accordingly, not only from the direction of the loudspeaker LS, but also from the direction of reflection, high degrees of attenuation result, while the useful sound is absorbed virtually unattenuated.
  • This directional characteristic is also in FIG. 3 for the middle of the earmold OP indicated.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Claims (5)

  1. Appareil auditif comprenant
    - une pièce ( OP ) tubulaire d'adaptation à l'oreille à insérer dans un tuyau ( GG ) auditif,
    - un haut-parleur ( LS ), qui est disposé dans la pièce ( OP ) d'adaptation à l'oreille,
    - un premier et au moins un deuxième microphones ( M1, M2, M3 ) et
    - une unité ( SA ) de traitement du signal,
    caractérisé en ce que
    - le premier et le deuxième microphones ( M1, M2 ) sont disposés à l'état inséré de la prothèse auditive dans la pièce ( OP ) d'adaptation à l'oreille des deux côtés du haut-parleur ( LS ), et le son allant du haut-parleur ( LS ) au premier microphone ( M1 ) est soumis à la même fonction de transfert que le son allant du haut-parleur ( LS ) au deuxième microphone ( M2 ),
    - une unité ( MM ) d'adaptation des microphones, par laquelle des différences des signaux des au moins deux microphones peuvent être constatées et raccordées aux microphones, et
    - par l'unité ( SA ) de traitement du signal raccordée à l'unité ( MM ) d'adaptation des microphones, seules sont envoyées au haut-parleur ( LS ) en étant traitées les parties des signaux de microphone, qui se distinguent les unes des autres à un instant donné.
  2. Appareil auditif suivant la revendication 1, qui est conformé en prothèse auditive.
  3. Appareil auditif suivant la revendication 1 ou 2, qui comporte un dispositif d'amplification, par lequel un son, qui pénètre de l'extérieur dans la pièce d'adaptation à l'oreille, peut être amplifié autrement qu'un son qui provient du haut-parleur.
  4. Appareil auditif suivant l'une des revendications précédentes, qui comporte un troisième microphone ( M3 ), une combinaison du signal du troisième microphone ( M3 ) aux signaux des premier et deuxième microphones provoquant une atténuation du son, qui est réfléchi par une membrane du tympan.
  5. Procédé de réduction de réactions dans un appareil auditif par
    - émission d'un son dans un tuyau ( GG ) auditif en un premier emplacement,
    - réception d'un son, au moins en un deuxième et en un troisième emplacements du tuyau auditif, les deux emplacements étant des deux côtés du premier emplacement dans le tuyau ( GG ) auditif et le son allant du premier emplacement au deuxième emplacement étant soumis à la même fonction de transfert que le son allant du premier emplacement au troisième emplacement et dans lequel le son reçu comporte le son émis et un son pénétrant de l'extérieur dans le tuyau ( GG ) auditif et
    - amplification seulement des parties du son reçu, qui, à un instant donné, sont différentes au deuxième et au troisième emplacements.
EP06117366A 2005-07-25 2006-07-18 Appareil auditif et procédé pour la réduction des rétroactions Not-in-force EP1748678B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005034646A DE102005034646B3 (de) 2005-07-25 2005-07-25 Hörvorrichtung und Verfahren zur Reduktion von Rückkopplungen

Publications (3)

Publication Number Publication Date
EP1748678A2 EP1748678A2 (fr) 2007-01-31
EP1748678A3 EP1748678A3 (fr) 2009-09-23
EP1748678B1 true EP1748678B1 (fr) 2011-09-07

Family

ID=37188779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06117366A Not-in-force EP1748678B1 (fr) 2005-07-25 2006-07-18 Appareil auditif et procédé pour la réduction des rétroactions

Country Status (5)

Country Link
US (1) US7860263B2 (fr)
EP (1) EP1748678B1 (fr)
CN (1) CN1905762B (fr)
DE (1) DE102005034646B3 (fr)
DK (1) DK1748678T3 (fr)

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DE102009051200B4 (de) * 2009-10-29 2014-06-18 Siemens Medical Instruments Pte. Ltd. Hörgerät und Verfahren zur Rückkopplungsunterdrückung mit einem Richtmikrofon
KR20110106715A (ko) * 2010-03-23 2011-09-29 삼성전자주식회사 후방 잡음 제거 장치 및 방법
EP3758394A1 (fr) 2010-12-20 2020-12-30 Earlens Corporation Appareil auditif intra-auriculaire anatomiquement personnalisé
EP2843971B1 (fr) 2013-09-02 2018-11-14 Oticon A/s Prothèse auditive avec microphone intra-auriculaire
US10034103B2 (en) 2014-03-18 2018-07-24 Earlens Corporation High fidelity and reduced feedback contact hearing apparatus and methods
DK3169396T3 (da) 2014-07-14 2021-06-28 Earlens Corp Glidende forspænding og peak-begrænsning for optiske høreapparater
US9924276B2 (en) 2014-11-26 2018-03-20 Earlens Corporation Adjustable venting for hearing instruments
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KR101693483B1 (ko) 2015-05-22 2017-01-06 중소기업은행 헤드셋의 하울링 및 에코 제거 방법 및 컴퓨터 프로그램
EP3139637B1 (fr) * 2015-09-07 2019-11-06 Oticon A/s Unité d'adaptation de microphone et prothèse auditive
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CN112738700A (zh) 2016-09-09 2021-04-30 伊尔兰斯公司 智能镜系统和方法
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Also Published As

Publication number Publication date
EP1748678A3 (fr) 2009-09-23
CN1905762A (zh) 2007-01-31
US7860263B2 (en) 2010-12-28
DK1748678T3 (da) 2012-01-09
US20070030990A1 (en) 2007-02-08
CN1905762B (zh) 2011-05-18
EP1748678A2 (fr) 2007-01-31
DE102005034646B3 (de) 2007-02-01

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