EP1239700B2 - Verfahren zum Betrieb eines Hörhilfegerätes oder Hörgerätesystem sowie Hörhilfegerät oder Hörgerätesystem - Google Patents

Verfahren zum Betrieb eines Hörhilfegerätes oder Hörgerätesystem sowie Hörhilfegerät oder Hörgerätesystem Download PDF

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Publication number
EP1239700B2
EP1239700B2 EP02003475.7A EP02003475A EP1239700B2 EP 1239700 B2 EP1239700 B2 EP 1239700B2 EP 02003475 A EP02003475 A EP 02003475A EP 1239700 B2 EP1239700 B2 EP 1239700B2
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EP
European Patent Office
Prior art keywords
feedback
hearing aid
hearing
oscillations
microphone
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.)
Expired - Lifetime
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EP02003475.7A
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German (de)
English (en)
French (fr)
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EP1239700A2 (de
EP1239700B1 (de
EP1239700A3 (de
Inventor
Volker Dr. Hohmann
Volkmar Hamacher
Inga Dr. Holube
Birger Prof. Kollmeier
Thomas Wittkop
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Sivantos GmbH
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Sivantos GmbH
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    • 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
    • H04R25/55—Electric hearing aids using an external connection, either wireless or wired
    • H04R25/552—Binaural
    • 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
    • H04R25/40—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; 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 invention relates to a method for operating a hearing aid system having a first hearing aid device which has at least a first microphone for generating a first microphone signal, and to a second hearing aid device having at least one second microphone for generating a second microphone signal.
  • Feedback can occur when sound picked up from the hearing aid microphone, amplified by a signal amplifier and output through the handset, returns to the microphone and is amplified again.
  • the so-called loop gain of the system i. the product of the hearing aid gain and the attenuation of the feedback path must be greater than 1.
  • the phase shift of this loop gain must correspond to any integer multiple of 360 °.
  • the simplest approach to reducing feedback-induced oscillations is to permanently reduce the hearing aid gain so that the loop gain remains below the critical limit even in adverse situations.
  • the decisive disadvantage, however, is that the hearing aid reinforcement required for severe deafness can no longer be achieved by this limitation.
  • the first class includes the so-called compensation algorithms, which use adaptive filters to estimate the feedback component in the microphone signal and neutralize it by subtraction, thus not impairing hearing aid amplification.
  • these compensation methods use uncorrelated, i. ideally "white", input signals ahead. Tonal input signals, which always have a high temporal correlation, lead to an erroneous estimation of the feedback path, which can lead to the erroneous subtraction of the tonal input signal itself.
  • the second class contains the algorithms, which become active only if there are feedback-induced oscillations. They generally include a mechanism for detecting oscillations that continuously monitors the microphone signal. If feedback-typical oscillations are detected, the hearing aid gain is reduced to such an extent that the loop gain drops below the critical limit.
  • the gain reduction may be e.g. by lowering a frequency channel or by activating a suitable narrow-band blocking filter (notch filter).
  • notch filter narrow-band blocking filter
  • the disadvantage here is that the oscillation detectors can not distinguish between tonal input signals and feedback whistles in principle. The result is that tonal input signals are held for feedback oscillations and then inadvertently lowered in level by the reduction mechanism (e.g., notch filters).
  • an adaptive filtering feedback cancellation device for a hearing prosthesis which in a particular embodiment comprises two microphones. A detection of oscillations is not performed.
  • a hearing aid with an oscillation detector is known. This device has only one microphone, so that a comparison of several microphone signals is not possible.
  • WO 99/43185 A1 From the WO 99/43185 A1 is a binaural digital hearing aid system with two head-worn hearing aids known. A microphone signal obtained in a hearing aid device of the hearing aid system is also transmitted to the respective other hearing aid device and further processed in it. There is thus a parallel processing of the microphone signals generated in both hearing aids in both hearing aids.
  • a hearing aid with an oscillation detector and a method for detecting oscillations in a hearing aid is known.
  • digitized samples are determined in successive periods of the input signal and a long-term mean value and a short-term mean value thereof are formed. From the comparison of the long-term average value with the short-term mean value, it is possible to deduce the presence of feedback-induced oscillations.
  • the object of the present invention is to specify a method for operating a hearing aid system, in which feedback-induced oscillations are avoided without noticeably impairing the sound quality.
  • the invention can be applied to all common types of hearing aid devices, for example hearing aid devices that can be worn behind the ear, hearing aid devices that can be worn in the ear or implantable hearing aid devices.
  • a multi-device hearing aid system is used to supply a hearing-impaired person, e.g. a hearing aid system with two worn on the head hearing aids for binaural care.
  • the microphone signals which are analyzed to detect feedback-induced oscillations, are based on different devices.
  • microphone signals are generated in two spaced-apart hearing aids.
  • at least one microphone must be arranged so that it does not or at most absorbs feedback-induced oscillations of a hearing aid in greatly attenuated form.
  • useful signals should be recorded by the respective microphones in a similar manner. By analyzing and comparing the microphone signals or signals derived therefrom, it is possible to distinguish between feedback-induced oscillations and useful signals with high reliability. In particular, even with tonal useful signals, the microphone signals generated by the microphones hardly differ, so that they are recognized as useful signals. In contrast, due to the arrangement of the microphones feedback-related signals are recorded by the microphones very different, so that they can be detected from the comparison of the microphone signals as a feedback condition and reduced by appropriate measures.
  • a hearing aid system with two hearing aid devices for binaural supply
  • the comparison between a microphone signal or a signal derived therefrom of the one hearing aid device with a microphone signal or a signal derived therefrom of the second hearing aid device Useful signals are then received by the two microphones in approximately the same and feedback-induced oscillations that arise at a hearing aid are not detected by the other hearing aid.
  • a signal path is provided between the hearing aids. In this case, the signal transmission takes place wirelessly
  • the microphone signal does not directly transmit the microphone signal, but derived therefrom specific characteristics of the microphone signal, which are relevant for detecting oscillations.
  • an oscillation is detected on one side, then it is only a feedback signal if no oscillation at this frequency is detected from the microphone signal of the other hearing aid device. If, on the other hand, an oscillation at the same frequency can be detected on both hearing aids, then it is most certainly a sinusoidal input signal.
  • the reduction of the hearing aid amplification forms a possibility of suppressing them. If the signal processing in a hearing aid device takes place in several parallel channels of a signal processing unit, according to a variant of the invention, the hearing aid amplification can be reduced only in the frequency channels in which feedback-induced oscillations are present.
  • a further possibility for reducing feedback-induced oscillations forms the invention in eliminating them by means of narrow-band filters whose cut-off frequencies approximately coincide with the oscillation frequencies.
  • the filters may e.g. be executed as a notch filter. If a notch filter is insufficient, further notch filters at the respective frequency are activated when new oscillations are detected.
  • the adaptive compensation filter is adapted according to a variant of the invention when detected feedback-induced oscillations.
  • the operating parameters of the filter can be changed such that an increase in the adaptation speed takes place.
  • the adaptation speed of the adaptive compensation filter is reduced if no feedback-induced oscillations are detected.
  • This principle can also be applied analogously to frequency-domain-based compensation filters.
  • the regulation of the adaptation speed can advantageously be frequency-specific.
  • the figure shows two hearing aids, between which a signal exchange is provided for detecting feedback-induced oscillations.
  • the figure shows two hearing aids 11 and 11 ', each with a microphone 12 or 12', a signal processing unit 13 or 13 'and a receiver 14 or 14'.
  • an oscillation detector 15 and 15 ' continuously monitors the microphone signal for oscillations and determines the oscillation frequencies at detected oscillations.
  • a signal path 17 for signal exchange between the hearing aids which takes place wirelessly.
  • an exchange of the detected oscillation frequencies via the signal path 17, an exchange of the detected oscillation frequencies.
  • the comparison units 16 and 16 ' the oscillation frequencies of the relevant hearing aid device are compared with the oscillation frequencies of the respective other hearing aid device.
  • notch filters Since very narrow band notch filters can be used, the effect is limited to a narrow frequency range, so that significant gain losses or loss of sound are avoided. If a notch filter is not sufficient, further notch filters N2 to NN or N2 'to NN' at the respective frequencies can be activated when new oscillations are detected.
  • the invention is not limited to the illustrated embodiment, but to a variety of variants expandable.
  • the specific characteristics of the microphone signals derived from more than two microphone signals can also be compared with one another.
  • the signal processing in a hearing aid according to the invention can be carried out in parallel in several channels of the signal processing unit.
  • the comparison of derived from the microphone signals specific characteristics of the microphone signals can then also be done in parallel in multiple channels. Measures for reducing detected feedback-induced oscillations are then advantageously limited only to the respective channels.
  • the comparison of derived from the microphone signals specific characteristics of the microphone signals continuously or in dependence certain parameters (eg the selected hearing program or the volume setting) are only temporary.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Electrically Operated Instructional Devices (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
EP02003475.7A 2001-03-02 2002-02-14 Verfahren zum Betrieb eines Hörhilfegerätes oder Hörgerätesystem sowie Hörhilfegerät oder Hörgerätesystem Expired - Lifetime EP1239700B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10110258A DE10110258C1 (de) 2001-03-02 2001-03-02 Verfahren zum Betrieb eines Hörhilfegerätes oder Hörgerätesystems sowie Hörhilfegerät oder Hörgerätesystem
DE10110258 2001-03-02

Publications (4)

Publication Number Publication Date
EP1239700A2 EP1239700A2 (de) 2002-09-11
EP1239700A3 EP1239700A3 (de) 2006-08-02
EP1239700B1 EP1239700B1 (de) 2008-05-07
EP1239700B2 true EP1239700B2 (de) 2017-07-26

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EP02003475.7A Expired - Lifetime EP1239700B2 (de) 2001-03-02 2002-02-14 Verfahren zum Betrieb eines Hörhilfegerätes oder Hörgerätesystem sowie Hörhilfegerät oder Hörgerätesystem

Country Status (5)

Country Link
US (1) US7013015B2 (da)
EP (1) EP1239700B2 (da)
AT (1) ATE394896T1 (da)
DE (2) DE10110258C1 (da)
DK (1) DK1239700T4 (da)

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US7242778B2 (en) * 2003-04-08 2007-07-10 Gennum Corporation Hearing instrument with self-diagnostics
US7639827B2 (en) * 2003-10-01 2009-12-29 Phonak Ag Hearing system which is responsive to acoustical feedback
US20060139030A1 (en) * 2004-12-17 2006-06-29 Hubbard Bradley J System and method for diagnosing manufacturing defects in a hearing instrument
DE102005008318B4 (de) * 2005-02-23 2013-07-04 Siemens Audiologische Technik Gmbh Hörhilfegerät mit benutzergesteuerter Einmessautomatik
DE102005034646B3 (de) * 2005-07-25 2007-02-01 Siemens Audiologische Technik Gmbh Hörvorrichtung und Verfahren zur Reduktion von Rückkopplungen
US20070183609A1 (en) * 2005-12-22 2007-08-09 Jenn Paul C C Hearing aid system without mechanical and acoustic feedback
DE102006019694B3 (de) 2006-04-27 2007-10-18 Siemens Audiologische Technik Gmbh Verfahren zum Einstellen eines Hörgeräts mit Hochfrequenzverstärkung
US8767975B2 (en) * 2007-06-21 2014-07-01 Bose Corporation Sound discrimination method and apparatus
DE102007037659B4 (de) 2007-08-09 2013-06-13 Siemens Audiologische Technik Gmbh Verfahren zum Betrieb eines Hörgerätesystems und Hörgerätesystem
EP2046073B1 (en) * 2007-10-03 2017-03-08 Oticon A/S Hearing aid system with feedback arrangement to predict and cancel acoustic feedback, method and use
US8588445B2 (en) * 2008-01-10 2013-11-19 Panasonic Corporation Hearing aid processing apparatus, adjustment apparatus, hearing aid processing system, hearing aid processing method, and program and integrated circuit thereof
DK2086250T3 (da) * 2008-02-01 2020-07-06 Oticon As Lyttesystem med et forbedret feedback-undertrykkelsessystem, en fremgangsmåde og anvendelse
US8611554B2 (en) * 2008-04-22 2013-12-17 Bose Corporation Hearing assistance apparatus
WO2010019660A2 (en) * 2008-08-12 2010-02-18 Intricon Corporation A switch for a hearing aid
US8767987B2 (en) * 2008-08-12 2014-07-01 Intricon Corporation Ear contact pressure wave hearing aid switch
DK2190217T3 (da) * 2008-11-24 2012-05-21 Oticon As Fremgangsmåde til reduktion af tilbagekobling i høreapparater samt tilsvarende anordning og tilsvarende computerprogramprodukt
EP2246845A1 (en) * 2009-04-21 2010-11-03 Siemens Medical Instruments Pte. Ltd. Method and acoustic signal processing device for estimating linear predictive coding coefficients
DE112011102933T5 (de) * 2010-09-03 2013-07-18 Med-El Elektromedizinische Geräte GmbH Im Mittelohr implantierbares Mikrofon
US9078077B2 (en) 2010-10-21 2015-07-07 Bose Corporation Estimation of synthetic audio prototypes with frequency-based input signal decomposition
JP6069830B2 (ja) * 2011-12-08 2017-02-01 ソニー株式会社 耳孔装着型収音装置、信号処理装置、収音方法
US9654874B2 (en) * 2013-12-16 2017-05-16 Qualcomm Incorporated Systems and methods for feedback detection
US11109164B2 (en) * 2017-10-31 2021-08-31 Widex A/S Method of operating a hearing aid system and a hearing aid system
US20250080905A1 (en) * 2021-08-06 2025-03-06 Nippon Telegraph And Telephone Corporation Utterance feedback apparatus, utterance feedback method, and program

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Also Published As

Publication number Publication date
DE10110258C1 (de) 2002-08-29
US20020176594A1 (en) 2002-11-28
EP1239700A2 (de) 2002-09-11
DK1239700T3 (da) 2008-09-01
DK1239700T4 (da) 2017-11-06
EP1239700B1 (de) 2008-05-07
ATE394896T1 (de) 2008-05-15
EP1239700A3 (de) 2006-08-02
DE50212199D1 (de) 2008-06-19
US7013015B2 (en) 2006-03-14

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