EP1398993B1 - Vorrichtung und Verfahren zur Rückkopplungskompensation in einem akustischen Verstärkungssystem, insbesondere in einem Hörgerät - Google Patents

Vorrichtung und Verfahren zur Rückkopplungskompensation in einem akustischen Verstärkungssystem, insbesondere in einem Hörgerät Download PDF

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Publication number
EP1398993B1
EP1398993B1 EP03019877A EP03019877A EP1398993B1 EP 1398993 B1 EP1398993 B1 EP 1398993B1 EP 03019877 A EP03019877 A EP 03019877A EP 03019877 A EP03019877 A EP 03019877A EP 1398993 B1 EP1398993 B1 EP 1398993B1
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EP
European Patent Office
Prior art keywords
filter
feedback
signal
compensator
compensation
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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.)
Revoked
Application number
EP03019877A
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German (de)
English (en)
French (fr)
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EP1398993A3 (de
EP1398993A2 (de
Inventor
Tom Weidner
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Sivantos GmbH
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Siemens Audioligische Technik GmbH
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Application filed by Siemens Audioligische Technik GmbH filed Critical Siemens Audioligische Technik GmbH
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Publication of EP1398993A3 publication Critical patent/EP1398993A3/de
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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback

Definitions

  • the invention relates to a feedback compensator in an acoustic amplification system for compensating a feedback signal resulting from amplification of an input signal due to a feedback path from an amplified output signal to the input signal, to an adaptive feedback compensation filter which generates a compensation signal from the amplified output signal, and to a first Filter that limits the frequency range in which the compensation signal is generated.
  • the invention also relates to a hearing aid with such a feedback compensator.
  • the invention relates to a method for compensating a feedback signal in an acoustic system, wherein the feedback signal is formed upon amplification of an input signal due to a feedback path from an amplified output signal to the input signal, and wherein an adaptive feedback compensation filter starts a compensation signal to emulate the feedback signal generated by the amplified output signal.
  • the invention also relates to an application of the method in a hearing aid.
  • a compensation signal is generated, which is subtracted from the input signal before amplification and which is such that a frequency causing a feedback is reduced to an intensity which is below a so-called stability limit.
  • the generation of the feedback compensation path takes place with the adaptive feedback compensation filter, which is usually a so-called FIR (Finite Impulse Response) filter.
  • FIR Finite Impulse Response
  • the feedback compensation filter is set with an adaptation unit which, for example, uses filter coefficients of the feedback compensation filter to adjust the effect of the feedback compensation filter so that an error signal, usually the input signal just before its entry into the amplification system, is minimized to the smallest signal energy.
  • the error signal and the output signal are compared by the adaptation unit by means of a least mean square (LMS) function.
  • LMS least mean square
  • the adaptation of the coefficients must not be too fast or too slow; it is characterized by the adaptation step size, i. the change in coefficients, and the speed at which new coefficients are sent to the feedback compensation filter.
  • the use of feedback compensation filters can cause artifacts and / or unwanted distortion of the input signal. Artefkte thus generated are perceived, for example, when using the feedback compensator in a hearing aid by a hearing aid wearer.
  • Various feedback compensators are, for example, from WO 00/19605 known.
  • the bandwidth of the compensation signal is limited in order to minimize interference due to the feedback compensation filter and to limit it to the unstable frequency range.
  • the limitation of the frequency range has the disadvantage that it is performed with a filter selecting the unstable frequency range.
  • the frequency range of the feedback may change during the application, for example because of an additionally occurring gap between an in-ear hearing aid and the ear canal of the hearing aid wearer or due to changing external acoustic conditions such as wearing a helmet. This quickly leads to a too wide, too narrow or completely wrong limitation of the frequency range with a correspondingly inadequate function of the feedback compensator and thus of the hearing aid.
  • the first filter is adaptable in its filter function during operation of the feedback compensator.
  • the filter function of a filter describes the transfer function, ie the transmission of the filter at a given frequency. It also determines the frequency range in which the filter works. 'Adaptable in its filter function' in the sense of the invention means that the filter function can be changed due to the feedback situation.
  • An adaptability of the first filter has the advantage that the first filter to the currently present unstable frequency range automatically can be adjusted. As a result, the course of the feedback compensation with respect to the frequency range can also be optimized automatically so that the feedback compensation can be carried out very effectively and quickly with minimal artifacts in the amplified output signal.
  • the feedback compensator may have a filter capability learning capability due to an adaptation process. This allows the first filter initially to be set to an experience or measurement based default. If, during use of the feedback compensation filter, feedback occurs at another frequency not covered by the feedback compensator, the filter function can be extended to this frequency range. Such an adaptive system may e.g. also perform tests that check that the frequency range detected by the filter function is too wide. If so, the frequency range can be reduced accordingly. This causes accelerated and artifact poorer feedback compensation.
  • the first filter consists of a plurality of individual filters. These together give the filter function of the first filter.
  • the advantage of such a modular filter construction lies in the versatile adjustment of the filter function.
  • a simple realization of the adaptability of the frequency range of the first filter then consists in adapting to the frequency range of the present feedback by switching between two or more individual filters.
  • the filter function of the first filter is variable by means of adjustable coefficients. This has the advantage that you can realize all the necessary filter functions with a single adjustable filter.
  • the amplified output signal is connected via the first filter to the feedback compensation filter. This has the advantage that the first filter primarily affects the feedback compensation path.
  • the feedback compensator has a control unit for adapting the first filter.
  • a control unit may for example be a switch for selecting the individual filters or it may comprise means for setting filter coefficients of the first filter.
  • the feedback compensator comprises an analysis unit for checking the feedback compensation.
  • an analysis unit can, for example, check the parameters of the adaptive feedback compensation filter and compare these with the filter parameters of the first filter. From a good match of the filter functions, it can be inferred, for example, that the first filter is ideally matched to the feedback compensation filter. A bad match of the filter functions may indicate the need for a further adaptation step to match the filter function of the first filter.
  • the analysis unit has means for comparing the input signal with the filtered output signal. By such a comparison it can be found out whether and in which frequency range there is feedback. The frequency range of the first filter can then be adjusted.
  • the analysis unit comprises an oscillation detector which is used for measuring feedback in the amplified frequency range.
  • an oscillation detector which is used for measuring feedback in the amplified frequency range.
  • the feedback compensator suppresses feedback caused by an acoustic feedback path.
  • the acoustic feedback path is understood as meaning both the transmission of the feedback via structure-borne noise and airborne sound.
  • the structure-borne sound can be detected, for example, by suitable reinforcements of the hearing aid housing, i. be prevented by structural measures.
  • airborne sound is generally harder to control.
  • it depends on the adaptation of an in-ear hearing aid to the anatomical conditions and on the other hand, it may, for example, due to deformations of the anatomy when chewing or yawning or due to changes in the acoustic environment change.
  • An exception is airborne sound, e.g. along the vent hole leads to feedback. Since this feedback path does not change, it can already be taken into account during signal processing, for example.
  • the feedback compensator is for compensation of an electromagnetic feedback path.
  • an electromagnetic feedback path is meant, for example, the feedback from the loudspeaker coil to the telecoil by electromagnetic fields emitted in the function of the loudspeaker and received by the telecoil.
  • the adaptive feedback compensation filter comprises an adaptation unit, e.g. for minimizing the error signal energy is connected to the input signal acting as an error signal.
  • an adaptation unit e.g. for minimizing the error signal energy is connected to the input signal acting as an error signal.
  • the adaptation unit is connected to the output of the first filter via a third filter. This has the advantage that the adaptation unit and the feedback compensation filter can be operated with differently filtered signals.
  • the filter function of the third filter is at least substantially equal to the filter function of the second filter.
  • the second and / or the third filter are adaptable filters in their filter function.
  • These adaptable filters can also be adapted with a control unit, for example the same as for the first filter.
  • the adaptation can, for example, again take place via a changeover between different filters or by setting the filter coefficients of the second and / or third filter.
  • a system in which all three filters are adaptable has the advantage of maximum freedom over the filter functions needed for high quality feedback compensation.
  • the interaction of filters which can be changed in their filter function, control unit and analysis unit always guarantees the optimal use of the bandwidth limiting filter, so that the optimal function of the adaptation unit is ensured.
  • the object relating to a hearing aid is solved by a hearing aid having a feedback compensator of the type described above.
  • the invention can be used in all known types of hearing aid devices, for example in behind the ear portable hearing aids, in the ear portable hearing aids, implantable hearing aids, hearing aid devices or Taschenbuchn.
  • the advantage of the learning ability of the feedback compensator is transferred to the hearing aid.
  • the frequency range in the delivery state of the device in its default setting can be particularly narrow to ensure the best possible sound. Only after feedback problems occur, the device adapts itself to the new acoustic conditions.
  • a simplified variant to exploit the adaptivity of the first filter is to adjust the frequency range manually or automatically by means of an in-situ measurement of the feedback path.
  • the object is achieved by a method for compensating a feedback signal in an acoustic system, the feedback signal resulting from amplification of an input signal due to a feedback path from an amplified output signal to the input signal, wherein an adaptive feedback compensation filter for simulating the feedback path generates a compensation signal from the amplified signal Output signal generated, and wherein the frequency range in which the compensation signal is generated during the compensation is adapted.
  • frequency domain adaptation is switched over between a plurality of filters or filter sets present in parallel.
  • the frequency range of the compensation signal is then passed through the filter sets, i. several filters, determined.
  • the frequency domain adaptation is performed with a variable in its filter function first filter.
  • the filter function can be changed, for example by means of coefficients. This allows adjustment of the frequency range with a single filter.
  • the feedback compensation is continuously checked by means of signal analysis.
  • parameters of the adaptive feedback compensation filter are compared with the frequency range in which the feedback path simulation takes place. This provides important information as to whether the frequency range of the feedback signal matches the frequency range required by the feedback compensation filter or whether adaptation of the frequency range is necessary.
  • the input signal is checked for feedback signal components by means of a signal analysis.
  • the input signal is examined for oscillations, which give an indication of feedback.
  • an error signal filtered with a second filter is compared with the signal for simulating the feedback path during the adaptation.
  • the signal for simulating the feedback path can be filtered before the comparison with a third filter.
  • the filter functions of the second and / or third filter are adapted.
  • the filter function of the second and / or third filter can be selected by means of a changeover switch from a selection of individual filters.
  • its filter functions can also be set by means of filter coefficients.
  • all three filters are controlled by the same control unit and adapted in their frequency range.
  • An essential aspect of the invention therefore consists in the control of the filter or filters which carry out the frequency selection for the actual feedback compensation filter. If the frequency range is changed, the adaptation speed can also be changed at the same time, for example to effect a faster adaptation to the new frequency range.
  • This can be done in different ways. For example, it can be determined by continuous evaluation of the coefficients of the feedback compensation filter in which frequency range the greatest feedback risk is present. If it is now recognized that an amplified feedback tendency exists in the region of the previous cutoff frequency, an extended frequency range can now be offered to the feedback compensation filter by means of another filter behavior, other coefficients or another filter. Another possibility is in the presence of an oscillation detector. Here it can monitor the frequency ranges outside the feedback compensation range. If this oscillation detector now detects an oscillation on the edges or outside the frequency range currently being processed by the feedback compensator, the frequency range of the compensation signal can again be adapted.
  • This learning capability allows e.g. the selection of a clearly limited frequency range in the delivery state of the hearing aid. This minimizes possible artifacts and allows for good sound, even with tonal input signals. If the hearing aid wearer has no feedback problems or only in the very restricted frequency range of the basic setting, then everything remains unchanged. However, if feedback occurs elsewhere, the hearing aid adjusts, expands or shifts the frequency range covered by the feedback compensation filter, and controls the feedback. The hearing aid stores this change in the frequency range and uses the new cutoff frequencies as new presets.
  • FIG. 1 shows a schematic overview of a feedback compensator 1, which also allows a good quality amplification of an acoustic input signal 3 with a hearing aid signal processing 5, if there is a feedback path 7, the frequency range may vary due to varying external conditions.
  • the feedback path 7 is determined, for example, by the diameter and by the position of the ventilation ventilation bore of an in-ear hearing aid device and by a changing inadequate completion of the in-ear hearing aid device with the ear. Changes in the feedback path 7 also occur when the acoustic Environment changes, eg when a helmet is put on or taken off.
  • the feedback compensator 1 is characterized in that it can adapt the frequency range of the compensation signal 8 to the changing frequency range of the feedback path 7.
  • the feedback compensator 1 generates the compensation signal 8 as follows.
  • a small part of the output signal 11 of the hearing aid signal processing 5 is separated at a node 12 for the feedback compensator 1.
  • There it is restricted with a filter 13 in the frequency domain and fed to a FIR filter 15. This generates from the filtered signal by means of its filter function, the compensation signal 8.
  • the compensation signal 8 is subtracted from the input signal 3, even before this the Höros réellesignal kau 5 was supplied.
  • the adjustment of the filter function of the FIR filter 15 takes place by means of filter coefficients 16, which are transmitted from an adaptation unit 17 to the FIR filter 15.
  • the adaptation unit 17 compares an error signal 19 which originates from the input signal 3 after being combined with the compensation signal 8, and the output signal 11 filtered with the filter 13. Both signals are further limited in the frequency domain by a respective filter 21 and 23, respectively.
  • the control variable for example, is the signal energy of the error signal 19 normalized to the filtered output signal 11 filtered by the filter 13.
  • the coefficients 16 of the FIR filter 15 are modified so that the signal energy of the error signal 19 is minimal, ie. free from feedback.
  • the Filter 13, 21 and 23 are adaptable in their filter function.
  • the adaptation takes place via the filter coefficients of the filters which are set by an analysis and control unit 25.
  • the analysis and control unit 25 is connected to the adaptation unit 17 for information exchange via, for example, the filter coefficients 16 of the FIR filter 15.
  • a comparison of the coefficients 16 with the coefficient or filter functions of the three filters 13, 21 and 23 enables the analysis and control unit 25 to adjust the three filters 13, 21 and 23 in their filter function in such a way that they optimally match the filter function superimpose the FIR filter 15.
  • the analysis and control unit 25 then informs the adaptation unit 17 about the adaptation step size and adaptation speed which best fit the frequency ranges set by the three filters 13, 21 and 23.
  • FIG. 2 illustrates the operation of the adaptation of the filter function by means of coefficients using the example of the filter 13.
  • the amplitude of the feedback path 7 is plotted as a function of the frequency, in the case of feedback in a narrow frequency range (feedback amplitude 27) and in the event of a change in the acoustic environment leading to a feedback risk in a wider frequency range (feedback amplitude 29).
  • the transmission of the filter 13 is also shown.
  • the transmission curve 31 for the first case is centered around 2kHz. The transmission drops sharply to lower frequencies in accordance with the feedback amplitude, so that only above 1 kHz signal energy for feedback compensation to the FIR filter 15 is forwarded.
  • FIG. 3 shows a schematic overview of a feedback compensator 39, which is substantially in construction and in its operation with the feedback compensator 1 in FIG. 1 matches.
  • the decisive difference lies in the realization of the filters 13, 21 and 23 and in the adaptation of their filter functions for limiting the frequency range of the feedback compensation.
  • the filters 13, 21 and 23 each comprise a filter set 41, 43 and 45 and a respective changeover switch 47, 49 and 51.
  • the filters of the filter sets 41, 43 and 45 cover the frequency range relevant for the feedback.
  • the adaptation of the filter functions is done by switching between the different filters of the filter sets 41, 43 and 45 or by the combined use of a selection of filters to add their effect.
  • the switches 47, 49 and 51 are controlled by the analysis and control unit 25.
  • the analysis and control unit 25 compares to it as in FIG. 1 the various filter functions with the coefficients of the FIR filter 15 and adapts the filter functions of the three filters 13, 21 and 23 as best as possible to the filter function of the FIR filter 15.
  • the feedback compensator 39 has the advantage over the feedback compensator 1 that the realization of the filter 13 , 21 and 23 by means of the switches 47, 49 and 51 and the fixed preset filters of the filter sets 41, 43 and 45 simpler, space and energy-saving.
  • the filter functions in their course can not be adapted as accurately as with the feedback compensator 1 of FIG. 1 is possible.
  • FIG. 4 is a possible distribution of the feedback frequency range between 0.5kHz and 6kHz on the filter of a filter set using the example of the four filters 53, 55, 57 and 59 of the filter set 41 shown.
  • the transmission areas the filters 53, 55, 57 and 59 extend from different lower limit frequencies to the common upper limit of 6 kHz.
  • the use of the filter 57 is sufficient.
  • the analysis and control unit 25 recognizes this broadening and controls the switch 47 such that the filter 53 is used for frequency limiting.
  • FIG. 5 shows an alternative division of the frequency range with the filters 53, 55, 57 and 59, which are narrow-band filters in this case.
  • the transmission ranges of the filters 53, 55, 57 and 59 together cover the relevant frequency range for the feedback.
  • the transmission areas overlap in the peripheral zones.
  • the feedback amplitude 27 is sufficiently compensated by the use of the filters 53 and 55, while for the feedback amplitude 29 all four filters 53, 55, 57 and 59 are used by the switch 47 at the same time.
  • a feedback compensator 65 is shown whose functionality and operation substantially resemble those of the feedback compensators 1 and 39 of FIGS. 1 and 3 correspond.
  • the analysis and control unit 25 additionally has an oscillation detector 67, which is connected to the input signal after the supply of the compensation signal 8.
  • the oscillation detector 67 examines the input signal 3 for oscillations which dominate the input signal 3 and give an indication of a feedback risk outside the covered frequency range. If the analysis and control unit 25 has detected a new feedback frequency with the aid of the oscillation detector 67, the filter function of the filters 13, 21 and 23 is extended to this new frequency range.
  • the advantage of this embodiment is that usually already present on a hearing aid Oscillation detector can be used. This simplifies the realization of the feedback compensator 65.
  • FIG. 7 a schematic structure of another embodiment of a feedback compensator is shown.
  • the feedback compensator 71 results essentially from the combination of the feedback compensators 39 FIG. 3 and 65 off FIG. 6 .
  • this particularly advantageous embodiment combines the easy-to-implement switching device between different filters and the use of an already existing oscillation detector for analyzing the feedback. Again, with the help of the frequency domain adaptation of the filters 13, 21 and 23, the quality and speed of the adaptation process for setting the filter function of the FIR filter 15 can be increased.

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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)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP03019877A 2002-09-13 2003-09-01 Vorrichtung und Verfahren zur Rückkopplungskompensation in einem akustischen Verstärkungssystem, insbesondere in einem Hörgerät Revoked EP1398993B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10242700 2002-09-13
DE10242700A DE10242700B4 (de) 2002-09-13 2002-09-13 Rückkopplungskompensator in einem akustischen Verstärkungssystem, Hörhilfsgerät, Verfahren zur Rückkopplungskompensation und Anwendung des Verfahrens in einem Hörhilfsgerät

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EP1398993A2 EP1398993A2 (de) 2004-03-17
EP1398993A3 EP1398993A3 (de) 2009-03-25
EP1398993B1 true EP1398993B1 (de) 2011-08-17

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EP03019877A Revoked EP1398993B1 (de) 2002-09-13 2003-09-01 Vorrichtung und Verfahren zur Rückkopplungskompensation in einem akustischen Verstärkungssystem, insbesondere in einem Hörgerät

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US (2) US20040125966A1 (da)
EP (1) EP1398993B1 (da)
AT (1) ATE521197T1 (da)
DE (1) DE10242700B4 (da)
DK (1) DK1398993T3 (da)

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DK2986033T3 (da) * 2005-03-29 2020-11-23 Oticon As Høreapparat til registrering af data og læring der fra
AU2006339694B2 (en) * 2006-03-09 2010-02-25 Widex A/S Hearing aid with adaptive feedback suppression
US8280088B2 (en) * 2006-05-19 2012-10-02 Siemens Audiologische Technik Gmbh Hearing apparatus with feedback detection and corresponding method
US9271090B2 (en) * 2007-12-07 2016-02-23 Wolfson Dynamic Hearing Pty Ltd Entrainment resistant feedback cancellation
CN102047693A (zh) * 2008-04-10 2011-05-04 Gn瑞声达A/S 具有反馈消除的音频***
EP2329659A4 (en) * 2008-08-12 2012-01-25 Intricon Corp SWITCH FOR HEARING AID
US8767987B2 (en) * 2008-08-12 2014-07-01 Intricon Corporation Ear contact pressure wave hearing aid switch
DE102009014540A1 (de) * 2009-03-24 2010-10-07 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betreiben einer Hörvorrichtung mit verstärkter Rückkopplungskompensation und Hörvorrichtung
DE102009031135A1 (de) * 2009-06-30 2011-01-27 Siemens Medical Instruments Pte. Ltd. Hörvorrichtung und Verfahren zur Unterdrückung von Rückkopplungen
WO2010040863A2 (en) 2010-01-15 2010-04-15 Phonak Ag A method for operating a hearing device as well as a hearing device
US9351085B2 (en) 2012-12-20 2016-05-24 Cochlear Limited Frequency based feedback control

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US5717772A (en) * 1995-08-07 1998-02-10 Motorola, Inc. Method and apparatus for suppressing acoustic feedback in an audio system
US6072884A (en) * 1997-11-18 2000-06-06 Audiologic Hearing Systems Lp Feedback cancellation apparatus and methods
DE19635878A1 (de) * 1996-09-04 1998-03-05 Deutsche Telekom Ag Vorrichtung zur Verbesserung des Sendesignals einer Echoreduktionseinrichtung
DE19639580C2 (de) * 1996-09-26 1998-09-17 Deutsche Telekom Ag Vorrichtung zur Reduktion akustischer Echos
DE19714966C2 (de) * 1997-04-10 1999-04-01 Siemens Ag Vorrichtung zur Rückhördämpfung
JPH11127496A (ja) * 1997-10-20 1999-05-11 Sony Corp ハウリング除去装置
DE19805942C1 (de) * 1998-02-13 1999-08-12 Siemens Ag Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen
WO2000019605A2 (en) * 1998-09-30 2000-04-06 House Ear Institute Band-limited adaptive feedback canceller for hearing aids
US6876751B1 (en) * 1998-09-30 2005-04-05 House Ear Institute Band-limited adaptive feedback canceller for hearing aids
DE19904538C1 (de) * 1999-02-04 2000-07-13 Siemens Audiologische Technik Verfahren zur Rückkopplungserkennung in einem Hörgerät und Hörgerät
US6434247B1 (en) * 1999-07-30 2002-08-13 Gn Resound A/S Feedback cancellation apparatus and methods utilizing adaptive reference filter mechanisms
DK1119218T3 (da) * 2000-01-21 2018-09-10 Oticon As Elektromagnetisk tilbagekoblingsreduktion i en kommunikationsanordning
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US6831986B2 (en) * 2000-12-21 2004-12-14 Gn Resound A/S Feedback cancellation in a hearing aid with reduced sensitivity to low-frequency tonal inputs

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Publication number Publication date
EP1398993A3 (de) 2009-03-25
US20080123885A1 (en) 2008-05-29
DE10242700A1 (de) 2004-05-06
DK1398993T3 (da) 2011-12-05
US20040125966A1 (en) 2004-07-01
DE10242700B4 (de) 2006-08-03
ATE521197T1 (de) 2011-09-15
EP1398993A2 (de) 2004-03-17

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