EP2357850A2 - Procédé et appareil auditif de reconnaissance et de soumission de contre-réactions à l'aide d'un microphone de guidage - Google Patents

Procédé et appareil auditif de reconnaissance et de soumission de contre-réactions à l'aide d'un microphone de guidage Download PDF

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Publication number
EP2357850A2
EP2357850A2 EP10191186A EP10191186A EP2357850A2 EP 2357850 A2 EP2357850 A2 EP 2357850A2 EP 10191186 A EP10191186 A EP 10191186A EP 10191186 A EP10191186 A EP 10191186A EP 2357850 A2 EP2357850 A2 EP 2357850A2
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EP
European Patent Office
Prior art keywords
signal
feedback
compensation filter
detection unit
acoustic feedback
Prior art date
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Granted
Application number
EP10191186A
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German (de)
English (en)
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EP2357850B1 (fr
EP2357850A3 (fr
Inventor
Sebastian Pape
Stefan Petrausch
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 Pte Ltd
Original Assignee
Siemens Medical Instruments Pte Ltd
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Publication of EP2357850A3 publication Critical patent/EP2357850A3/fr
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    • 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
    • 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
    • H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers

Definitions

  • the invention relates to a method and a hearing device with an improved feedback detection and feedback suppression by the use of a directional microphone.
  • FIG. 1 shows the principle of acoustic feedback.
  • a hearing device 1 has a microphone 2, which receives an acoustic useful signal 10, converts it into an electrical microphone signal 11 and emits it to a signal processing unit 3.
  • the microphone signal 11 is, among other things, processed and amplified and delivered to a receiver 4 as an electrical receiver signal 12.
  • the electrical receiver signal 12 is again converted into an acoustic output signal 13 and delivered to the eardrum 7 of a hearing aid wearer.
  • the acoustic feedback path 14 is reproduced digitally in the hearing aid 1.
  • the replication takes place, for example, by means of an adaptive compensation filter 5, which is fed by the receiver signal 12.
  • a filtered compensation signal 15 is subtracted from the microphone signal 11.
  • the effect of the acoustic feedback path 14 is thereby canceled and there is a feedback-free input signal 16 for the signal processing unit.
  • the microphone signal 11 is evaluated with the aid of a detection unit 6 and examined for possible feedback.
  • artefacts can also be created, however, since additional signal components are generated or feedback whistling occurs in the case of an adaptive compensation filter which is not set optimally.
  • EP 1 033 063 B1 discloses a hearing aid with a feedback suppression, wherein two parallel adaptive compensation filters are used to improve the feedback suppression.
  • the useful signal 10 is the biggest problem because it represents a noise signal from the perspective of a feedback suppression system.
  • the feedback signal 14 is highly correlated with the useful signal 10, as a result of which the detection unit 6 can make it more difficult to distinguish between the feedback 14 and the useful signal 10.
  • Directional microphone systems are one of the methods of noise suppression that has been established for years and demonstrably improve speech intelligibility in listening situations in which the useful signal and the interference signals come from different directions.
  • the directivity is generated by differential processing of two or more adjacent microphones with omnidirectional characteristics.
  • FIG. 2 shows a simplified block diagram of a directional microphone system 1st order with two microphones 21, 22 at a distance of about 10 to 15 mm.
  • This results for sound signals coming from the front V an external delay of T2 between the first and the second microphone 21, 22, which corresponds for example to the distance of the microphones 21, 22 to each other.
  • the signal R2 of the second microphone 22 is delayed by the time T1 in a delay unit 23, inverted in the inverter 24 and added to the signal R1 of the first microphone 21 in the first adder 25.
  • the sum results in the directional microphone signal RA, which can be supplied to a listener, for example via signal processing.
  • the direction-dependent sensitivity arises essentially from a subtraction of the second microphone signal R2 delayed by the time T2 from the first signal R1. Sound signals from the front V are thus, after appropriate equalization, not attenuated, while, for example, sound signals are extinguished from behind S.
  • Adaptive directional microphones are microphones that are able to adapt to different environmental conditions during operation.
  • the goal is usually pursued as well as possible to receive useful sound emitted by a useful sound source and forward, during the outgoing from one or more Störschallánn Störschall in the output from the adaptive directional microphone output signal should be as well attenuated.
  • a hearing aid with an adaptive directional microphone is known in which the directional gain / attenuation can be varied according to the result of a signal analysis.
  • the invention claims a method for operating a hearing device with at least two omnidirectional microphones emitting microphones and a detection unit for detecting or detecting or detecting an acoustic feedback.
  • the microphones are electrically interconnected to form a first directivity signal.
  • the directivity of the first signal is adjusted so that the acoustic feedback in the first signal is maximized or maximally amplified.
  • the first signal is analyzed by the detection unit for detecting a possible acoustic feedback.
  • the invention offers the advantage that a detection of the feedback by a signal with improved signal / noise ratio can be done. Feedback is thus detected more reliably and faster.
  • the microphones can be interconnected with each other to form a second signal with directivity.
  • the directivity of the second signal can be adjusted so that the acoustic feedback in the second signal is minimized, that is, that as far as possible only the useful signal is included.
  • the acoustic feedback in the second signal can be reduced by a second adaptive compensation filter, where it is detected by the detection unit is controllable. The advantage of this is that a feedback suppression is reliable and faster executable.
  • a second signal can be formed from one of the microphone signals.
  • the acoustic feedback in the second signal can be reduced by a second adaptive compensation filter controllable by the detection unit.
  • the acoustic feedback in the first signal may be reduced by a first adaptive compensation filter controllable by the detection unit.
  • the acoustic feedback in the second signal may be reduced by the second adaptive compensation filter controllable by the first compensation filter.
  • an acoustic output signal can be formed from the feedback-reduced second signal. This is presented to the eardrum of a hearing aid wearer.
  • the method can be carried out separately for several frequency bands.
  • the invention also provides a hearing aid with at least two omnidirectional microphones emitting microphones and a detection unit for detecting an acoustic feedback.
  • the hearing aid also includes a first directional microphone unit for electrically interconnecting the microphones with each other to form a first directivity signal, wherein the directivity of the first signal is adjusted to maximize the acoustic feedback in the first signal.
  • the hearing aid also includes a detection unit which analyzes the first signal for determining the acoustic feedback.
  • the hearing aid comprises a second directional microphone unit for electrically interconnecting the microphones with one another to form a second signal with directivity, wherein the directivity of the second signal is adjusted such that the acoustic feedback in the second signal is minimized.
  • the hearing aid also includes a second adaptive compensation filter for reducing the acoustic feedback in the second signal, wherein the second compensation filter is controllable by the detection unit.
  • the hearing device also comprises a second adaptive compensation filter for reducing the acoustic feedback in a second signal formed by one of the microphone signals, wherein the second compensation filter can be controlled by the detection unit.
  • the hearing device also comprises a first adaptive compensation filter for reducing the acoustic feedback in the first signal, wherein the first compensation filter is controllable by the detection unit, and wherein the acoustic feedback in the second signal is reduced by the second adaptive compensation filter controllable by the first compensation filter.
  • the hearing aid may comprise a receiver which forms an acoustic output signal from the feedback-reduced second signal.
  • FIG. 3 2 shows a block diagram of a hearing aid 30 with two microphones 31 for receiving an acoustic input signal 50 and with a receiver 32 for outputting an acoustic output signal 43.
  • a part of the acoustic output signal 43 is fed back to the microphones 31 via an acoustic feedback path 34, which leads to an undesired one Can cause feedback whistles.
  • the unwanted feedback signal superimposes a desired payload signal 49 on the input signal 50.
  • the feedback path 34 is reproduced as exactly as possible with the aid of a second adaptive compensation filter 39.
  • An output of the second compensation filter 39 supplies a compensation signal 48, which is subtracted from a second signal 42 at an input of a signal processor 33 of the hearing device 30.
  • the second signal 42 may be either one of the microphone signals 40 of the microphones 31 (in FIG FIG. 3 dashed lines drawn), or it is a signal formed by the two microphone signals 40 by means of a second adaptive directional microphone unit 36 with directivity.
  • the directivity of the second signal 42 is set such that the useful signal 49 is as strong as possible and the feedback signal 34 is as weak as possible.
  • the second adaptive compensation filter 39 is controlled by a first control signal 44 of a detection unit 37. That is, the filter parameters of the second compensation filter 39 may be changed by the detection unit 37.
  • the task of the detection unit 37 is to effectively detect feedback in the input signal 50.
  • a first adaptive directional microphone unit 35 the two microphone signals 40 are electrically interconnected, so that a first signal 41 with directional effect is formed.
  • the directional microphone unit 35 is adapted such that in the first signal 41, the acoustic feedback occurs maximally amplified. In other words, the directional microphone formed by the two microphones 31 "looks" in the direction of the feedback path 34. Thus, the signal-to-noise ratio of the first signal 41 is maximized.
  • the first signal 41 is then fed to the detection unit 37, which can detect acoustic feedback in a known manner.
  • FIG. 4 2 shows a block diagram of a hearing aid 30 with two microphones 31 for receiving an acoustic input signal 50 and with a receiver 32 for outputting an acoustic output signal 43.
  • a part of the acoustic output signal 43 is fed back to the microphones 31 via an acoustic feedback path 34, resulting in an undesired one Can cause feedback whistles.
  • the unwanted feedback signal superimposes a desired payload signal 49 on the input signal 50.
  • the feedback path 34 is reproduced as exactly as possible with the aid of a second adaptive compensation filter 39.
  • An output of the second compensation filter 39 supplies a compensation signal 48, which is subtracted from a second signal 42 at an input of a signal processor 33 of the hearing device 30.
  • the second signal 42 may be either one of the microphone signals 40 of the microphones 31 (in FIG FIG. 4 dashed lines drawn), or it is a signal formed by the two microphone signals 40 by means of a second adaptive directional microphone unit 36 with directivity.
  • the directivity of the second signal 42 is adjusted the useful signal 49 is as strong as possible and the feedback signal 34 is as weak as possible.
  • the second adaptive compensation filter 39 is controlled by a first control signal 44 of a detection unit 37. That is, the filter parameters of the second compensation filter 39 may be changed by the detection unit 37.
  • the task of the detection unit 37 is to effectively detect feedback in the input signal 50.
  • a first adaptive directional microphone unit 35 the two microphone signals 40 are electrically interconnected, so that a first signal 41 with directional effect is formed.
  • the directional microphone unit 35 is adapted such that in the first signal 41, the acoustic feedback occurs maximally amplified. In other words, the directional microphone formed by the two microphones 31 "looks" in the direction of the feedback path 34. Thus, the signal-to-noise ratio of the first signal 41 is maximized.
  • the first signal 41 is then fed to the detection unit 37, which can detect acoustic feedback in a known manner.
  • the hearing aid 30 also comprises a first adaptive compensation filter 38, which is arranged in the path between the output of the signal processing unit 33 and the first signal 41.
  • This so-called “shadow filter” 38 is controlled by a second control signal 45 of the detection unit 37 in such a way that a first compensation signal 47 of the first compensation filter 38 corresponds as accurately as possible to the fed-back signal.
  • the first compensation signal 47 is subtracted from the first signal 41 and fed to an input of the first compensation filter 46.
  • An output of the first compensation filter 46 provides a third control signal 46 which is used to control the second compensation filter 39.
  • the second compensation filter 39 is controlled both by the detection unit 37 directly and indirectly via the "shadow filter" 38.

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  • 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)
  • Circuit For Audible Band Transducer (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP10191186.5A 2009-12-22 2010-11-15 Procédé et appareil auditif de reconnaissance et de soumission de contre-réactions à l'aide d'un microphone de guidage Not-in-force EP2357850B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009060094A DE102009060094B4 (de) 2009-12-22 2009-12-22 Verfahren und Hörgerät zur Rückkopplungserkennung und -unterdrückung mit einem Richtmikrofon

Publications (3)

Publication Number Publication Date
EP2357850A2 true EP2357850A2 (fr) 2011-08-17
EP2357850A3 EP2357850A3 (fr) 2011-09-21
EP2357850B1 EP2357850B1 (fr) 2017-09-27

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EP10191186.5A Not-in-force EP2357850B1 (fr) 2009-12-22 2010-11-15 Procédé et appareil auditif de reconnaissance et de soumission de contre-réactions à l'aide d'un microphone de guidage

Country Status (5)

Country Link
US (1) US8588444B2 (fr)
EP (1) EP2357850B1 (fr)
CN (1) CN102104821B (fr)
DE (1) DE102009060094B4 (fr)
DK (1) DK2357850T3 (fr)

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
CN103329566A (zh) * 2010-12-20 2013-09-25 峰力公司 用于房间中的语音增强的方法和系统
EP2890154B1 (fr) * 2013-12-27 2017-12-13 GN Resound A/S Prothèse auditive avec suppression de rétroaction
US9628923B2 (en) 2013-12-27 2017-04-18 Gn Hearing A/S Feedback suppression
JP6019098B2 (ja) * 2013-12-27 2016-11-02 ジーエヌ リザウンド エー／エスＧｎ Ｒｅｓｏｕｎｄ Ａ／Ｓ フィードバック抑制
EP3038383A1 (fr) * 2014-12-23 2016-06-29 Oticon A/s Dispositif d'aide auditive avec des capacités de saisie d'image
DK3245797T3 (en) * 2015-01-14 2019-03-04 Widex As PROCEDURE TO OPERATE A HEARING SYSTEM AND HEARING SYSTEM
US9838804B2 (en) * 2015-02-27 2017-12-05 Cochlear Limited Methods, systems, and devices for adaptively filtering audio signals
CN108630216B (zh) * 2018-02-15 2021-08-27 湖北工业大学 一种基于双麦克风模型的mpnlms声反馈抑制方法
EP3582051A1 (fr) 2018-06-12 2019-12-18 Siemens Aktiengesellschaft Analyse complète des perturbations de dispositifs de commande et d'installations techniques industrielles
EP3799444A1 (fr) 2019-09-25 2021-03-31 Oticon A/s Prothèse auditive comportant un système de microphone directionnel
DE102020206367A1 (de) * 2020-05-20 2021-11-25 Sivantos Pte. Ltd. Verfahren zum Betrieb eines Hörgeräts und Hörgerät
EP4266706A4 (fr) * 2022-03-04 2024-04-10 Shenzhen Shokz Co., Ltd. Dispositif de correction auditive

Citations (2)

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WO2000019770A1 (fr) 1998-09-29 2000-04-06 Siemens Audiologische Technik Gmbh Prothese auditive et procede de traitement de signaux de microphone dans une prothese auditive
EP1033063B1 (fr) 1997-11-18 2003-05-02 GN ReSound as Appareil et procede de suppression de retroaction

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EP0855129A1 (fr) * 1995-10-10 1998-07-29 AudioLogic, Incorporated Prothese auditive a traitement de signaux numeriques et selection de strategie de traitement
US6275596B1 (en) * 1997-01-10 2001-08-14 Gn Resound Corporation Open ear canal hearing aid system
AU2003277877B2 (en) * 2003-09-19 2006-11-27 Widex A/S A method for controlling the directionality of the sound receiving characteristic of a hearing aid and a signal processing apparatus for a hearing aid with a controllable directional characteristic
EP1469702B1 (fr) * 2004-03-15 2016-11-23 Sonova AG Suppression de la réaction acoustique
US7324651B2 (en) * 2004-03-15 2008-01-29 Phonak Ag Feedback suppression
EP1730992B1 (fr) * 2004-03-23 2017-05-10 Oticon A/S Aide auditive avec systeme anti-retroaction
DE602005021259D1 (de) * 2005-10-11 2010-06-24 Widex As Hörgerät und verfahren zum verarbeiten von eingangssignalen in einem hörgerät
ATE511322T1 (de) * 2006-03-03 2011-06-15 Widex As Hörgerät und verfahren zur verwendung von verstärkungsbegrenzung in einem hörgerät
CA2647462C (fr) * 2006-04-01 2014-05-20 Widex A/S Appareil auditif et procede permettant de commander la vitesse d'adaptation dans des systemes anti-retroaction pour appareils auditifs
US7826632B2 (en) * 2006-08-03 2010-11-02 Phonak Ag Method of adjusting a hearing instrument
DK2046073T3 (en) * 2007-10-03 2017-05-22 Oticon As Hearing aid system with feedback device for predicting and canceling acoustic feedback, method and application

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
EP1033063B1 (fr) 1997-11-18 2003-05-02 GN ReSound as Appareil et procede de suppression de retroaction
WO2000019770A1 (fr) 1998-09-29 2000-04-06 Siemens Audiologische Technik Gmbh Prothese auditive et procede de traitement de signaux de microphone dans une prothese auditive

Also Published As

Publication number Publication date
EP2357850B1 (fr) 2017-09-27
CN102104821A (zh) 2011-06-22
US8588444B2 (en) 2013-11-19
DK2357850T3 (da) 2018-01-08
CN102104821B (zh) 2015-12-02
DE102009060094A1 (de) 2011-06-30
DE102009060094B4 (de) 2013-03-14
US20110150250A1 (en) 2011-06-23
EP2357850A3 (fr) 2011-09-21

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