WO2000021332A2 - Feedback management for hearing aid - Google Patents

Feedback management for hearing aid Download PDF

Info

Publication number
WO2000021332A2
WO2000021332A2 PCT/DK1999/000536 DK9900536W WO0021332A2 WO 2000021332 A2 WO2000021332 A2 WO 2000021332A2 DK 9900536 W DK9900536 W DK 9900536W WO 0021332 A2 WO0021332 A2 WO 0021332A2
Authority
WO
WIPO (PCT)
Prior art keywords
gain
hearing aid
filter
volume control
frequency range
Prior art date
Application number
PCT/DK1999/000536
Other languages
French (fr)
Other versions
WO2000021332A3 (en
Inventor
Finn Danielsen
Ulrik Skov
Original Assignee
Oticon A/S
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 Oticon A/S filed Critical Oticon A/S
Priority to EP99970256A priority Critical patent/EP1120008B1/en
Priority to DK99970256.6T priority patent/DK1120008T3/en
Priority to AT99970256T priority patent/ATE518383T1/en
Priority to AU59694/99A priority patent/AU5969499A/en
Publication of WO2000021332A2 publication Critical patent/WO2000021332A2/en
Publication of WO2000021332A3 publication Critical patent/WO2000021332A3/en

Links

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
    • H04R25/45—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
    • H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/356—Amplitude, e.g. amplitude shift or compression
    • 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
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/502—Customised settings for obtaining desired overall acoustical characteristics using analog signal processing

Definitions

  • the present invention relates to a method of managing acoustic feedback in hearing aids.
  • Feedback is a problem, which occurs in a hearing aid when the acoustic output signal from the hearing aid propagates beside an ear mould or through a vent and consequently enter the hearing aid microphone as an acoustic input.
  • the hereby closed acoustic loop will especially for frequencies above 1-2 kHz often cause the hearing aid to howl, which disables the function of the hearing aid.
  • Previously known methods comprise the use of a high frequency cut-off filter to reduce the gain for the feedback management.
  • This method can have the form of an isolated filter to be individually adjusted, but suffer from a drawback in that when the volume control of the hearing aid is turned down and hereby reduces the gain of the feedback frequencies, the filter is still in action reducing the high frequency gain.
  • Another known method comprises a combination of the volume control and a high frequency cut-off filter meaning that when the volume control is turned up and hereby increases the gain of the hearing aid, the filter goes gradually into action and reduces the high frequency gain. The drawbacks of this scheme being that until now this could not be individually adjusted and secondly that the steepness of this filter was a modest 6 dB/octave.
  • the objective of the present invention is to provide a method for feedback management, which reduces the feedback problems without the previously mentioned drawbacks.
  • the determining of the maximum gain before feedback occurs and the controlling the volume control is applied for several channels.
  • a 1st or preferably higher order multi channel filter can be used for feedback management and adaptation purposes. This filter has shown to possess adequate properties for the purpose of the method according to the invention.
  • the hearing aid comprises a housing containing a microphone, an amplifier in connection with the microphone, a receiver in connection with the amplifier, where the amplifier comprises a multi channel type of filter, a control system for monitoring the gain in at least one channel, and control means for controlling the volume control in the at least one channel.
  • the determining of the maximum gain before feedback occurs and the controlling the volume control is applied for several channels.
  • the multi channel filter is adapted for both feedback management and adaptation purposes.
  • FIG. 1-2 are drawings showing the function of a method according to the invention:
  • the multi channel filter has as an example been chosen to be a two channel type filter along with a suitable crossover frequency.
  • volume control comprise in this example 15 steps, each step defining a 2 dB increase or decrease of gain. All frequencies are subjected to the same increase or decrease of gain depending on the setting of the volume control.
  • VC volume control
  • FIG. 2 a situation appears, where the maximum allowable gain in the high frequency channel before feedback occurs has been determined to volume control (VC) setting -12 dB. If the user exceeds this setting of the volume control, the control system takes over and for example keeps the gain in the high frequency channel constant and allows only an increase in gain for the low frequency channel.
  • the number of channels, step size, the number of steps etc. may in this connection be chosen different from the above example.

Abstract

The invention relates to a method of managing acoustic feedback in a hearing aid, characterised by using a multi (two or more) channel type of filter hereby splitting the frequency range up in two or more separate parts; determining the maximum allowable gain in at least one frequency range before feedback occurs; monitoring the volume control in such a way, that if the maximum allowable gain before feedback occurs is reached, the gain is manipulated for the offending frequency range. The determination of maximum allowable gain and the monitoring of the volume control is applied for several channels. The invention further relates to hearing aid implementing the method according to the method according to the invention.

Description

TITLE
Feedback management for hearing aid
BACKGROUND OF THE INVENTION
The present invention relates to a method of managing acoustic feedback in hearing aids. Feedback is a problem, which occurs in a hearing aid when the acoustic output signal from the hearing aid propagates beside an ear mould or through a vent and consequently enter the hearing aid microphone as an acoustic input. The hereby closed acoustic loop will especially for frequencies above 1-2 kHz often cause the hearing aid to howl, which disables the function of the hearing aid.
During time several attempts have been made to avoid or to reduce the feedback problems of hearing aids. Previously known methods comprise the use of a high frequency cut-off filter to reduce the gain for the feedback management. This method can have the form of an isolated filter to be individually adjusted, but suffer from a drawback in that when the volume control of the hearing aid is turned down and hereby reduces the gain of the feedback frequencies, the filter is still in action reducing the high frequency gain. Another known method comprises a combination of the volume control and a high frequency cut-off filter meaning that when the volume control is turned up and hereby increases the gain of the hearing aid, the filter goes gradually into action and reduces the high frequency gain. The drawbacks of this scheme being that until now this could not be individually adjusted and secondly that the steepness of this filter was a modest 6 dB/octave.
The objective of the present invention is to provide a method for feedback management, which reduces the feedback problems without the previously mentioned drawbacks. SUMMARY OF THE INVENTION
The objective of the invention is achieved by a method, which is characterised by:
• using a multi (two or more) channel type of filter hereby splitting the frequency range up in two or more separate parts
• determining the maximum allowable gain in at least one frequency range before feedback occurs
• monitoring the volume control in such a way, that if the maximum allowable gain before feedback occurs is reached or exceeded, the gain is manipulated for an offending frequency range.
By such a method the above mentioned drawbacks of the previously known methods are remedied and the feedback management may be adjusted individually for the actual user.
In a further embodiment the determining of the maximum gain before feedback occurs and the controlling the volume control is applied for several channels.
By using a multi channel type of filter it is possible by proper selection of the crossover frequencies to use the same type of filter for both feedback and adaption purposes. Using the same filter for both purposes reduces the size of the amplifier and to some extent also the cost of the amplifier.
A 1st or preferably higher order multi channel filter can be used for feedback management and adaptation purposes. This filter has shown to possess adequate properties for the purpose of the method according to the invention.
According to the invention the hearing aid comprises a housing containing a microphone, an amplifier in connection with the microphone, a receiver in connection with the amplifier, where the amplifier comprises a multi channel type of filter, a control system for monitoring the gain in at least one channel, and control means for controlling the volume control in the at least one channel.
In a further embodiment the determining of the maximum gain before feedback occurs and the controlling the volume control is applied for several channels.
In a preferred embodiment the multi channel filter is adapted for both feedback management and adaptation purposes.
The invention will be explained more detailed in the following with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1-2 are drawings showing the function of a method according to the invention:
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the FIGS. 1 to 2 the multi channel filter has as an example been chosen to be a two channel type filter along with a suitable crossover frequency.
From FIG. 1 a situation appears where the feedback management has been disabled and the volume control functions in a conventional manner. The volume control comprise in this example 15 steps, each step defining a 2 dB increase or decrease of gain. All frequencies are subjected to the same increase or decrease of gain depending on the setting of the volume control. From FIG. 2 a situation appears, where the maximum allowable gain in the high frequency channel before feedback occurs has been determined to volume control (VC) setting -12 dB. If the user exceeds this setting of the volume control, the control system takes over and for example keeps the gain in the high frequency channel constant and allows only an increase in gain for the low frequency channel.
The number of channels, step size, the number of steps etc. may in this connection be chosen different from the above example.

Claims

1. A method of managing acoustic feedback in a hearing aid, characterised by
• using a multi (two or more) channel type of filter hereby splitting the frequency range up in two or more separate parts
• determining the maximum allowable gain in at least one frequency range before feedback occurs
• monitoring the volume control in such a way, that if the maximum allowable gain before feedback occurs is reached or exceeded, the gain is manipulated for an offending frequency range.
2. A method according to claim 1, characterized in that the determination of maximum allowable gain and the monotoring of the volume control is applied for several channels.
3. A method according to claim 1 or 2, characterised in that the multi channel filter is of 1. st order or higher.
4. A method according to claim 1, 2 or 3, characterised in that the multi channel filter is used for feedback management or for adaptation purposes or both.
5. A method according to any of the claims 1-4, characterized in that the gain in a manipulated frequency range is kept constant or only increased slightly.
6. A hearing aid comprising a housing containing a microphone, an amplifier in connection with the microphone, a receiver in connection with the amplifier, characterized in that the amplifier comprises a multi channel type of filter, a control system for monitoring the gain in at least one channel, and control means for controlling the volume control in the at least one channel.
7. A hearing aid according to claim 6, characterized in that the determining of the maximum gain before feedback occurs and the controlling the volume control is applied for several channels.
8. A hearing aid according to claim 6 or 7, characterized in that the multi channel filter is of 1. st order or higher order.
9. A hearing aid according to claim 6,7 or 8, characterized in that the multi channel filter is adapted for both feedback management and adaptation purposes.
PCT/DK1999/000536 1998-10-07 1999-10-07 Feedback management for hearing aid WO2000021332A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP99970256A EP1120008B1 (en) 1998-10-07 1999-10-07 Feedback management for hearing aid
DK99970256.6T DK1120008T3 (en) 1998-10-07 1999-10-07 Feedback management for a hearing aid
AT99970256T ATE518383T1 (en) 1998-10-07 1999-10-07 FEEDBACK TREATMENT FOR A HEARING AID
AU59694/99A AU5969499A (en) 1998-10-07 1999-10-07 Feedback management for hearing aid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA199801274 1998-10-07
DKPA199801274 1998-10-07

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09807000 A-371-Of-International 2001-05-21
US10/760,385 Continuation US20040151332A1 (en) 1998-10-07 2004-01-21 Feedback management for hearing aid

Publications (2)

Publication Number Publication Date
WO2000021332A2 true WO2000021332A2 (en) 2000-04-13
WO2000021332A3 WO2000021332A3 (en) 2000-07-27

Family

ID=8103013

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1999/000536 WO2000021332A2 (en) 1998-10-07 1999-10-07 Feedback management for hearing aid

Country Status (5)

Country Link
EP (1) EP1120008B1 (en)
AT (1) ATE518383T1 (en)
AU (1) AU5969499A (en)
DK (1) DK1120008T3 (en)
WO (1) WO2000021332A2 (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6718301B1 (en) 1998-11-11 2004-04-06 Starkey Laboratories, Inc. System for measuring speech content in sound
US6829363B2 (en) 2002-05-16 2004-12-07 Starkey Laboratories, Inc. Hearing aid with time-varying performance
US7010136B1 (en) 1999-02-17 2006-03-07 Micro Ear Technology, Inc. Resonant response matching circuit for hearing aid
US7010135B2 (en) 2002-10-02 2006-03-07 Phonak Ag Method to determine a feedback threshold in a hearing device
US7139403B2 (en) 2000-12-05 2006-11-21 Ami Semiconductor, Inc. Hearing aid with digital compression recapture
US7162044B2 (en) 1999-09-10 2007-01-09 Starkey Laboratories, Inc. Audio signal processing
EP1909534A2 (en) * 2006-10-02 2008-04-09 Siemens Audiologische Technik GmbH Hearing device with asymmetric audio balance and corresponding adjusting method
US7369669B2 (en) 2002-05-15 2008-05-06 Micro Ear Technology, Inc. Diotic presentation of second-order gradient directional hearing aid signals
EP1278396A3 (en) * 2001-07-16 2008-12-10 Panasonic Corporation Howling detecting and suppressing apparatus, method and computer program product
US7536022B2 (en) 2002-10-02 2009-05-19 Phonak Ag Method to determine a feedback threshold in a hearing device
US7650004B2 (en) 2001-11-15 2010-01-19 Starkey Laboratories, Inc. Hearing aids and methods and apparatus for audio fitting thereof
US7756276B2 (en) 2003-08-20 2010-07-13 Phonak Ag Audio amplification apparatus
US7778426B2 (en) 2003-08-20 2010-08-17 Phonak Ag Feedback suppression in sound signal processing using frequency translation
US8351626B2 (en) 2004-04-01 2013-01-08 Phonak Ag Audio amplification apparatus
US8359283B2 (en) 2009-08-31 2013-01-22 Starkey Laboratories, Inc. Genetic algorithms with robust rank estimation for hearing assistance devices
US8965016B1 (en) 2013-08-02 2015-02-24 Starkey Laboratories, Inc. Automatic hearing aid adaptation over time via mobile application
US8971559B2 (en) 2002-09-16 2015-03-03 Starkey Laboratories, Inc. Switching structures for hearing aid
US9036823B2 (en) 2006-07-10 2015-05-19 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US9204227B2 (en) 2009-12-30 2015-12-01 Starkey Laboratories, Inc. Noise reduction system for hearing assistance devices
US9215534B2 (en) 2002-09-16 2015-12-15 Starkey Laboratories, Inc. Switching stuctures for hearing aid
US9282416B2 (en) 2007-01-03 2016-03-08 Starkey Laboratories, Inc. Wireless system for hearing communication devices providing wireless stereo reception modes
US9344817B2 (en) 2000-01-20 2016-05-17 Starkey Laboratories, Inc. Hearing aid systems
US9774961B2 (en) 2005-06-05 2017-09-26 Starkey Laboratories, Inc. Hearing assistance device ear-to-ear communication using an intermediate device
US10003379B2 (en) 2014-05-06 2018-06-19 Starkey Laboratories, Inc. Wireless communication with probing bandwidth

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US5016280A (en) * 1988-03-23 1991-05-14 Central Institute For The Deaf Electronic filters, hearing aids and methods
US5111419A (en) * 1988-03-23 1992-05-05 Central Institute For The Deaf Electronic filters, signal conversion apparatus, hearing aids and methods
DK169958B1 (en) * 1992-10-20 1995-04-10 Gn Danavox As Hearing aid with compensation for acoustic feedback
JP3398156B2 (en) * 1995-05-02 2003-04-21 ヴェーデクス・アクティーセルスカプ Method for controlling a hearing aid that is programmable or programmed to be adjusted to normal volume

Non-Patent Citations (1)

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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6718301B1 (en) 1998-11-11 2004-04-06 Starkey Laboratories, Inc. System for measuring speech content in sound
US7010136B1 (en) 1999-02-17 2006-03-07 Micro Ear Technology, Inc. Resonant response matching circuit for hearing aid
US7162044B2 (en) 1999-09-10 2007-01-09 Starkey Laboratories, Inc. Audio signal processing
US9344817B2 (en) 2000-01-20 2016-05-17 Starkey Laboratories, Inc. Hearing aid systems
US9357317B2 (en) 2000-01-20 2016-05-31 Starkey Laboratories, Inc. Hearing aid systems
US7489790B2 (en) 2000-12-05 2009-02-10 Ami Semiconductor, Inc. Digital automatic gain control
US7139403B2 (en) 2000-12-05 2006-11-21 Ami Semiconductor, Inc. Hearing aid with digital compression recapture
US8009842B2 (en) 2000-12-05 2011-08-30 Semiconductor Components Industries, Llc Hearing aid with digital compression recapture
US9559653B2 (en) 2000-12-05 2017-01-31 K/S Himpp Digital automatic gain control
EP1278396A3 (en) * 2001-07-16 2008-12-10 Panasonic Corporation Howling detecting and suppressing apparatus, method and computer program product
US7650004B2 (en) 2001-11-15 2010-01-19 Starkey Laboratories, Inc. Hearing aids and methods and apparatus for audio fitting thereof
US9049529B2 (en) 2001-11-15 2015-06-02 Starkey Laboratories, Inc. Hearing aids and methods and apparatus for audio fitting thereof
US7822217B2 (en) 2002-05-15 2010-10-26 Micro Ear Technology, Inc. Hearing assistance systems for providing second-order gradient directional signals
US7369669B2 (en) 2002-05-15 2008-05-06 Micro Ear Technology, Inc. Diotic presentation of second-order gradient directional hearing aid signals
US7206424B2 (en) 2002-05-16 2007-04-17 Starkey Laboratories, Inc. Hearing aid with time-varying performance
US6829363B2 (en) 2002-05-16 2004-12-07 Starkey Laboratories, Inc. Hearing aid with time-varying performance
US9215534B2 (en) 2002-09-16 2015-12-15 Starkey Laboratories, Inc. Switching stuctures for hearing aid
US8971559B2 (en) 2002-09-16 2015-03-03 Starkey Laboratories, Inc. Switching structures for hearing aid
US7010135B2 (en) 2002-10-02 2006-03-07 Phonak Ag Method to determine a feedback threshold in a hearing device
US7536022B2 (en) 2002-10-02 2009-05-19 Phonak Ag Method to determine a feedback threshold in a hearing device
US7778426B2 (en) 2003-08-20 2010-08-17 Phonak Ag Feedback suppression in sound signal processing using frequency translation
US7756276B2 (en) 2003-08-20 2010-07-13 Phonak Ag Audio amplification apparatus
US8351626B2 (en) 2004-04-01 2013-01-08 Phonak Ag Audio amplification apparatus
US9774961B2 (en) 2005-06-05 2017-09-26 Starkey Laboratories, Inc. Hearing assistance device ear-to-ear communication using an intermediate device
US9510111B2 (en) 2006-07-10 2016-11-29 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US10051385B2 (en) 2006-07-10 2018-08-14 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US9036823B2 (en) 2006-07-10 2015-05-19 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US11678128B2 (en) 2006-07-10 2023-06-13 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US11064302B2 (en) 2006-07-10 2021-07-13 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US10728678B2 (en) 2006-07-10 2020-07-28 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US10469960B2 (en) 2006-07-10 2019-11-05 Starkey Laboratories, Inc. Method and apparatus for a binaural hearing assistance system using monaural audio signals
US8170235B2 (en) 2006-10-02 2012-05-01 Siemens Audiologische Technik Gmbh Hearing apparatus with unsymmetrical tone balance unit and corresponding control method
EP1909534A3 (en) * 2006-10-02 2010-12-01 Siemens Audiologische Technik GmbH Hearing device with asymmetric audio balance and corresponding adjusting method
EP1909534A2 (en) * 2006-10-02 2008-04-09 Siemens Audiologische Technik GmbH Hearing device with asymmetric audio balance and corresponding adjusting method
US10511918B2 (en) 2007-01-03 2019-12-17 Starkey Laboratories, Inc. Wireless system for hearing communication devices providing wireless stereo reception modes
US9854369B2 (en) 2007-01-03 2017-12-26 Starkey Laboratories, Inc. Wireless system for hearing communication devices providing wireless stereo reception modes
US11218815B2 (en) 2007-01-03 2022-01-04 Starkey Laboratories, Inc. Wireless system for hearing communication devices providing wireless stereo reception modes
US9282416B2 (en) 2007-01-03 2016-03-08 Starkey Laboratories, Inc. Wireless system for hearing communication devices providing wireless stereo reception modes
US11765526B2 (en) 2007-01-03 2023-09-19 Starkey Laboratories, Inc. Wireless system for hearing communication devices providing wireless stereo reception modes
US8359283B2 (en) 2009-08-31 2013-01-22 Starkey Laboratories, Inc. Genetic algorithms with robust rank estimation for hearing assistance devices
US9204227B2 (en) 2009-12-30 2015-12-01 Starkey Laboratories, Inc. Noise reduction system for hearing assistance devices
US8965016B1 (en) 2013-08-02 2015-02-24 Starkey Laboratories, Inc. Automatic hearing aid adaptation over time via mobile application
US10003379B2 (en) 2014-05-06 2018-06-19 Starkey Laboratories, Inc. Wireless communication with probing bandwidth

Also Published As

Publication number Publication date
ATE518383T1 (en) 2011-08-15
WO2000021332A3 (en) 2000-07-27
EP1120008A2 (en) 2001-08-01
DK1120008T3 (en) 2011-10-24
EP1120008B1 (en) 2011-07-27
AU5969499A (en) 2000-04-26

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