EP2161949A2 - Procédé de fonctionnement d'un dispositif auditif ayant une directivité et dispositif auditif correspondant - Google Patents

Procédé de fonctionnement d'un dispositif auditif ayant une directivité et dispositif auditif correspondant Download PDF

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Publication number
EP2161949A2
EP2161949A2 EP09167068A EP09167068A EP2161949A2 EP 2161949 A2 EP2161949 A2 EP 2161949A2 EP 09167068 A EP09167068 A EP 09167068A EP 09167068 A EP09167068 A EP 09167068A EP 2161949 A2 EP2161949 A2 EP 2161949A2
Authority
EP
European Patent Office
Prior art keywords
microphone
hearing
frequency
signal
output signal
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Withdrawn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
EP09167068A
Other languages
German (de)
English (en)
Other versions
EP2161949A3 (fr
Inventor
Andreas Tiefenau
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
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 Siemens Medical Instruments Pte Ltd filed Critical Siemens Medical Instruments Pte Ltd
Publication of EP2161949A2 publication Critical patent/EP2161949A2/fr
Publication of EP2161949A3 publication Critical patent/EP2161949A3/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/06—Transformation of speech into a non-audible representation, e.g. speech visualisation or speech processing for tactile aids
    • G10L2021/065—Aids for the handicapped in understanding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/021—Behind the ear [BTE] hearing aids
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band processing
    • 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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/552—Binaural

Definitions

  • the invention relates to a specified in claim 1 method for operating a hearing with a first and a second omnidirectional microphone and a specified in claim 8 associated hearing with directivity.
  • the speech behavior in a noise-filled environment is a common problem of hearing-impaired people, who need a signal-to-noise ratio of up to 10 dB to achieve the same speech intelligibility as normal hearing people.
  • the natural directivity of the outer ear is lost.
  • rehabilitation with hearing aids should not only include the individual compensation of hearing loss through amplification and dynamic compression, but also the reduction of noise in order to significantly improve speech intelligibility in situations with background noise.
  • Modern digital hearing aids have noise cancellation techniques that meet the hearing aid-specific requirements for efficacy, sound quality, and artifact freedom.
  • Directional microphone systems are among the methods of noise suppression that have 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. 1 shows a simplified block diagram of a directional microphone system 1st order with two microphones 1, 2 at a distance from about 10 to 15 mm.
  • This creates an external delay of T2 between the first and the second microphone for sound signals coming from the front V, which for example corresponds to the distance of the microphones 1, 2 from each other.
  • the signal R2 of the second microphone 2 is delayed by the time T1 in the delay unit 3, inverted in the inverter 4 and added to the signal R1 of the first microphone 1 in the first adder 5.
  • 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.
  • Structure and mode of action of directional microphone systems for hearing aids are, for example, in the patent DE 103 31 956 B3 described.
  • a disadvantage of directional microphone systems is that they become unstable at high amplification as a result of feedback.
  • the amplification can be selected to be larger, which brings advantages in particular in the case of extreme deafness.
  • the DE 102 49 416 A1 discloses a method for adjusting and operating a hearing aid worn on a volunteer's body with a microphone system located outside the auditory canal of the subject while wearing a hearing aid.
  • the DE 698 03 933 T2 indicates an arrangement and method for forming a given gain characteristic depending on the direction from which acoustic signals are received. Delays of acoustic signals relative to each other are determined for this purpose.
  • the DE 603 16 474 T2 a method and a microphone system for providing a directional response, wherein an output signal is energy minimized.
  • the CH 693 759 A5 an apparatus and a method for the suppression of noise, wherein an output signal is formed from two microphones by filtering and interconnection.
  • the stated object is achieved with the method of independent claim 1 and the hearing device of independent claim 8.
  • the directivity can be effected by shielding against ambient sound.
  • a microphone directivity can be generated without additional measures.
  • the ambient sound can be received predominantly from behind. This makes it possible, for example, to recognize speech from the front during signal processing.
  • the hearing device may comprise at least a third, a third microphone signal emitting microphone.
  • body microphones and hearing aid microphones can be combined.
  • the frequency-dependent amplification can be determined from a difference between the first and the second microphone signal. This allows, for example, sound from the front to be separated from the sound from behind.
  • the invention also provides a hearing device with a first and a second, a first and a second microphone signal releasing microphone.
  • the first and the second microphone have different directivity.
  • the two microphone signals can be transformed into the frequency domain by means of a fast Fourier transformation or a filter bank, and a frequency-dependent amplification can be determined for an output signal of the hearing apparatus from the two microphone signals transformed into the frequency domain.
  • the directivity can be achieved by shielding against ambient sound.
  • the first microphone receives the ambient sound predominantly from the front and the second microphone receives the ambient sound predominantly from behind.
  • the output signal can be formed from the first and / or second microphone signal and the output signal can be amplified with the frequency-dependent amplification.
  • the hearing device can be designed as a behind-the-ear hearing device, with the two microphones being arranged in the behind-the-ear hearing device.
  • the different shielding can be achieved by an outer shade.
  • the first and the second microphone may be embodied as body microphones, and the hearing device may comprise a hearing device with at least one third microphone emitting a third microphone signal.
  • the output signal can be formed from the at least one third microphone signal and the output signal can be amplified with the frequency-dependent amplification.
  • the different shielding can be effected by the body of a hearing aid wearer.
  • the first and the second microphone may each comprise a radio transmitting device which transmits a frequency-dependent level information to the hearing aid for determining the frequency-dependent amplification. This data can be transmitted bandwidth-saving.
  • the first and the second microphone may be located in different hearing aids and the hearing aids may each comprise a radio transmitting device which transmits a frequency-dependent level information to the other hearing aid for determining the frequency-dependent amplification.
  • the hearing aids may each comprise a radio transmitting device which transmits a frequency-dependent level information to the other hearing aid for determining the frequency-dependent amplification.
  • FIG. 2 shows a behind-the-ear hearing aid 6 of a hearing device according to the invention.
  • the hearing device 6 comprises an earhook 10 and a base unit 20.
  • the base unit 20 comprises an MTO switch 7 for switching off the hearing device 6 and for manual mode selection of the signal recording via a built-in microphone 1, 2 or a telecoil, not shown, a volume control 8 and a program selector switch 9 for setting different programs.
  • Two spaced-apart microphones 1, 2, a first microphone 1 and a second microphone 2 due to different shading by an outer ear of a hearing device user on an ambient sound substantially from different directions.
  • the first microphone 1 preferably detects sound from the front, the second microphone 2 preferably from behind.
  • the signals of the two microphones 1, 2 are frequency-dependent evaluated and used for a frequency-dependent amplification of one or both microphone signals. For example, it can be determined from the difference of the two microphone signals whether a sound signal to be amplified comes from the front or from behind. For frequency components from the front, the signal routed to a receiver is correspondingly more amplified.
  • FIG. 3 an embodiment of the invention is shown with body microphones.
  • a first microphone 1 is attached to the body 11 of a human at the front, a second microphone 2 to the human back.
  • the first microphone 1 preferably receives ambient sound from the front, while the second microphone 2 essentially receives ambient sound from behind.
  • Behind the human ear a hearing aid 6 is arranged with a third microphone.
  • the two body microphones 1, 2 send frequency-dependent level information by radio FS to the hearing aid 6, where the information for the determination of a frequency-dependent amplification of the microphone signal of the third microphone 13 are evaluated.
  • FIG. 4 shows a block diagram of the arrangement according to FIG. 3 , From the outputs of the two microphones 1, 2 with directional effect, the microphone signals reach a first filter bank 15, in which a frequency analysis takes place. From outputs of the first filter bank 15, the frequency-dependent level information is transmitted by radio to a gain detection unit 16 of the hearing aid 6. In the gain determination unit 16, the level information of the first and second microphone 1, 2 are analyzed and evaluated and frequency-dependent gain factors determined. These are fed to an input of a multiplier 18.
  • the signal of the third microphone 13 of the hearing device 6 is decomposed into its frequency components in a second filter bank and fed to a further input of the multiplier 18.
  • the signal of the third microphone 13 is amplified according to the amplification factor, and the amplified signal is subsequently subjected to an inverse Fourier transformation fed.
  • the converted back into the time domain output signal is supplied to an input of a handset 12.
  • the electrical signals are converted back into acoustic. A sound signal with direction information is thus provided to a hearing device user.
  • the frequency-transformed first and second microphone signal are transformed into a frequency-dependent level information (eg by low-pass filtering):
  • L 1 t ⁇ n Level S 1 t ⁇ n
  • L 2 t ⁇ n Level S 2 t ⁇ n ,
  • a frequency-dependent gain g () is determined, which is multiplied together with a basic gain gain () by the third microphone signal S 3 (t)
  • S A t ⁇ n S 3 t ⁇ n ⁇ gain n + G L 1 t ⁇ n . L 2 t ⁇ n ,
  • the output signal S A (t) is then determined by recovery from the individual channel signals S A (t, n).
  • the weighting of the frequency-dependent gain can be adjusted to the long-term spectrum of speech. This makes it easier to detect from the front coming voice-relevant signal components.
  • the use of additional, external microphones can be avoided.
  • level information is exchanged between a left and a right hearing aid.
  • laterally incident sound can be detected.
  • FIG. 5 a head of a hearing device user is shown with two behind-the-ear hearing aids 6.
  • one of the two hearing aids 6 is at least a first microphone 1, in the other hearing aid 6 is a second microphone 2.
  • the two microphones 1, 2 are shadowed differently due to their arrangement against ambient sound.
  • the microphone signals are processed and the level information is transmitted to the respective other hearing device via radio signal FS for further processing.
  • a directivity can be generated in each hearing aid 6.

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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)
EP09167068A 2008-09-05 2009-08-03 Procédé de fonctionnement d'un dispositif auditif ayant une directivité et dispositif auditif correspondant Withdrawn EP2161949A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008046040A DE102008046040B4 (de) 2008-09-05 2008-09-05 Verfahren zum Betrieb einer Hörvorrichtung mit Richtwirkung und zugehörige Hörvorrichtung

Publications (2)

Publication Number Publication Date
EP2161949A2 true EP2161949A2 (fr) 2010-03-10
EP2161949A3 EP2161949A3 (fr) 2010-04-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09167068A Withdrawn EP2161949A3 (fr) 2008-09-05 2009-08-03 Procédé de fonctionnement d'un dispositif auditif ayant une directivité et dispositif auditif correspondant

Country Status (4)

Country Link
US (1) US20100046775A1 (fr)
EP (1) EP2161949A3 (fr)
CN (1) CN101711007A (fr)
DE (1) DE102008046040B4 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013034957A1 (fr) * 2011-09-07 2013-03-14 Iti Infotech Industries Limited Appareil d'amplification sonore portable pour personnes atteintes d'une déficience auditive
WO2016156595A1 (fr) 2015-04-02 2016-10-06 Sivantos Pte. Ltd. Appareil auditif

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102783184B (zh) * 2010-02-19 2015-11-25 西门子医疗器械公司 用于助听设备的双耳侧面感知的方法
DE102017221006A1 (de) * 2017-11-23 2019-05-23 Sivantos Pte. Ltd. Verfahren zum Betrieb eines Hörgerätes
EP3503581B1 (fr) * 2017-12-21 2022-03-16 Sonova AG Réduction du bruit dans un signal sonore d'un dispositif auditif
DK181045B1 (en) * 2020-08-14 2022-10-18 Gn Hearing As Hearing device with in-ear microphone and related method

Citations (5)

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Publication number Priority date Publication date Assignee Title
DE69803933T2 (de) 1997-08-20 2002-10-10 Phonak Ag, Staefa Verfahren zur elektronischen strahlformung von akustischen signalen und akustisches sensorgerät
CH693759A5 (de) 1999-01-06 2004-01-15 Martin Kompis Vorrichtung und Verfahren zur Unterdrueckung von St oergeraeuschen.
DE10249416A1 (de) 2002-10-23 2004-05-19 Siemens Audiologische Technik Gmbh Verfahren zum Einstellen und zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät
DE10331956B3 (de) 2003-07-16 2005-01-27 Siemens Audiologische Technik Gmbh Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteistiken einstellbar sind
DE60316474T2 (de) 2002-12-20 2008-06-26 Oticon A/S Mikrofonsystem mit richtansprechverhalten

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US4622440A (en) * 1984-04-11 1986-11-11 In Tech Systems Corp. Differential hearing aid with programmable frequency response
US6068589A (en) * 1996-02-15 2000-05-30 Neukermans; Armand P. Biocompatible fully implantable hearing aid transducers
JPH10336285A (ja) * 1997-05-29 1998-12-18 Matsushita Electric Ind Co Ltd 携帯型電話装置
DE59911808D1 (de) * 1998-09-29 2005-04-28 Siemens Audiologische Technik Hörgerät und verfahren zum verarbeiten von mikrofonsignalen in einem hörgerät
JP2000322074A (ja) * 1999-05-13 2000-11-24 Denso Corp 音声入力区間判定装置，音声データ抽出装置，音声認識装置，車両用ナビゲーション装置及び入力用マイク
US6668062B1 (en) * 2000-05-09 2003-12-23 Gn Resound As FFT-based technique for adaptive directionality of dual microphones
WO2001097558A2 (fr) * 2000-06-13 2001-12-20 Gn Resound Corporation Directionnalite adaptative basee sur un modele polaire fixe
DE10327890A1 (de) * 2003-06-20 2005-01-20 Siemens Audiologische Technik Gmbh Verfahren zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteristiken einstellbar sind
DE10334396B3 (de) * 2003-07-28 2004-10-21 Siemens Audiologische Technik Gmbh Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteristiken einstellbar sind
ATE511321T1 (de) * 2005-03-01 2011-06-15 Oticon As System und verfahren zur bestimmung der direktionalität von schall mit einem hörgerät
JP4075951B2 (ja) * 2006-03-08 2008-04-16 ダイキン工業株式会社 負荷駆動装置及び空気調和機の室外機並びに負荷の駆動方法
JP2008035356A (ja) * 2006-07-31 2008-02-14 Ricoh Co Ltd ノイズキャンセラ、ノイズキャンセラを有する集音装置及びノイズキャンセラを有する携帯電話機
WO2008071236A2 (fr) * 2006-12-15 2008-06-19 Phonak Ag Système auditif à suppression de bruit améliorée
EP2238592B1 (fr) * 2008-02-05 2012-03-28 Phonak AG Procédé de réduction de bruit dans un signal d'entrée d'un dispositif auditif et dispositif auditif

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69803933T2 (de) 1997-08-20 2002-10-10 Phonak Ag, Staefa Verfahren zur elektronischen strahlformung von akustischen signalen und akustisches sensorgerät
CH693759A5 (de) 1999-01-06 2004-01-15 Martin Kompis Vorrichtung und Verfahren zur Unterdrueckung von St oergeraeuschen.
DE10249416A1 (de) 2002-10-23 2004-05-19 Siemens Audiologische Technik Gmbh Verfahren zum Einstellen und zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät
DE60316474T2 (de) 2002-12-20 2008-06-26 Oticon A/S Mikrofonsystem mit richtansprechverhalten
DE10331956B3 (de) 2003-07-16 2005-01-27 Siemens Audiologische Technik Gmbh Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteistiken einstellbar sind

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013034957A1 (fr) * 2011-09-07 2013-03-14 Iti Infotech Industries Limited Appareil d'amplification sonore portable pour personnes atteintes d'une déficience auditive
WO2016156595A1 (fr) 2015-04-02 2016-10-06 Sivantos Pte. Ltd. Appareil auditif
US10798494B2 (en) 2015-04-02 2020-10-06 Sivantos Pte. Ltd. Hearing apparatus

Also Published As

Publication number Publication date
EP2161949A3 (fr) 2010-04-07
DE102008046040A1 (de) 2010-03-18
CN101711007A (zh) 2010-05-19
DE102008046040B4 (de) 2012-03-15
US20100046775A1 (en) 2010-02-25

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Effective date: 20130316