EP1469702A2 - Suppression de la réaction acoustique - Google Patents

Suppression de la réaction acoustique Download PDF

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Publication number
EP1469702A2
EP1469702A2 EP04006073A EP04006073A EP1469702A2 EP 1469702 A2 EP1469702 A2 EP 1469702A2 EP 04006073 A EP04006073 A EP 04006073A EP 04006073 A EP04006073 A EP 04006073A EP 1469702 A2 EP1469702 A2 EP 1469702A2
Authority
EP
European Patent Office
Prior art keywords
feedback
input
acoustical
output
converter arrangement
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.)
Granted
Application number
EP04006073A
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German (de)
English (en)
Other versions
EP1469702A3 (fr
EP1469702B1 (fr
Inventor
Hans-Ueli Roeck
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.)
Sonova Holding AG
Original Assignee
Phonak AG
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 Phonak AG filed Critical Phonak AG
Priority to EP04006073.3A priority Critical patent/EP1469702B1/fr
Priority to DK04006073.3T priority patent/DK1469702T3/en
Publication of EP1469702A2 publication Critical patent/EP1469702A2/fr
Publication of EP1469702A3 publication Critical patent/EP1469702A3/fr
Application granted granted Critical
Publication of EP1469702B1 publication Critical patent/EP1469702B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically

Definitions

  • the present invention deals with a method for suppressing feedback between an acoustical output of an electrical/acoustical output converter arrangement and an acoustical input of a acoustical/electrical input converter arrangement of a hearing device, wherein acoustical signals impinging on the input converter arrangement are converted into a first electrical signal, by a controllably variable transfer characteristic and which is dependent on the angle at which said acoustical signals impinge on the input converter arrangement.
  • the first electrical signal is processed and a resulting signal is applied to the output converter.
  • an electrical feedback-compensating signal generated in dependency of the result signal which is applied via a feedback signal path upstream the processing.
  • a unit to which the output of the input converter arrangement is input and which provides a signal transfer characteristic to its output which has an amplification dependent on spatial angle at which acoustical signals impinge on the acoustic input of the input converter arrangement is called a beamformer unit.
  • the transfer characteristic in polar representation is called the beam.
  • An adaptive beamformer unit is a beamformer unit, the beam generated therefrom being controllably variable.
  • the feedback-compensation process Due to the complex task of estimating the feedback-signal to be suppressed e.g. by correlation at the feedback-compensator, the feedback-compensation process has a relatively long adaptation time constant to adapt from one feedback situation to be suppressed to another by appropriately varying its gain.
  • Such an adaptation time constant is customarily in the range of hundreds of milliseconds.
  • a behind-the-ear hearing device 3 with an input converter arrangement 5 applied at the pinna 1 of an individual experiences feedback to be suppressed from a distinct direction as shown at d1.
  • An in-the-ear hearing device 7 according to Fig. 2 which has, as an example, a vent 9 and two acoustical ports 11 to the input converter arrangement, experiences feedback signals to be suppressed from the distinct directions d2.
  • a further approach for suppressing feedback is to install high signal attenuation between the input and the output converter of the device for signals which impinge on the input converter under such distinct spatial angles. This accords with applying a beamformer technique generating a beam having zero or minimum amplification at such angles.
  • Hearing devices which have adaptive beamformer ability are known e.g. from the WO 00/33634.
  • feedback compensation techniques as e.g. known from the EP 0 656 737 with adaptive beamformer technique as e.g. known from the WO 00/33634 and thereby to place minimum amplification of the beam at those angles which are specific for feedback signals to be suppressed impinging on the input converter. This especially because these angles are clearly different from the target direction range within which maximum amplification of the beam is to be variably set.
  • the adaptation time constant of an adaptive beamformer unit is considerably smaller, in the range of single to few dozen milliseconds, than the adaption time constant of a feedback-compensator which is, as mentioned above, in the range of hundreds of milliseconds.
  • a beamformer unit is provided, the input thereof being operationally connected to two mutually distant microphones of an input converter arrangement.
  • two feedback compensators are provided with inputs operationally connected to the input of the output converter arrangement. The respective output signals are superimposed to the respective output signals of the two microphones.
  • a third approach is proposed in M. Brandenstein et al. as mentioned and in W. Herbold et al. "Computationally efficient frequency domain combination of acoustic echo cancellation and robust adaptive beamforming".
  • a generalised side lobe cancelling technique for the beamformer is used whereat only a not-adaptive beamformer is placed upstream the compensation feedback path, thus eliminating the adaptation time problem as well as double computational load. Nevertheless, by this approach placing minimum amplification of the beam in the direction of feedback signal arrival may not be realised.
  • a method for suppressing feedback between an acoustical output of an electrical/acoustical output converter arrangement and an acoustical input of an acoustical/electrical input converter arrangement of a hearing device wherein acoustical signals impinging on the input converter arrangement are converted into a first electric signal by a controllably variable transfer characteristic which is dependent on the angle at which said acoustical signals impinge on said input converter arrangement.
  • the first electric signal is processed and a resulting signal is applied to the output converter arrangement.
  • the feedback to be suppressed is compensated by a feedback compensating signal which is generated in dependency of the resulting signal and is fed back by a feedback signal path to a location along the signal path upstream the processing.
  • the feedback-compensating signal is fed back to the first electric signal - thus downstream the beamformer - and the adaptation rate of converting to variations of the transfer characteristic - and thus of beamforming - is controlled in dependency of gain along the compensator feedback signal path.
  • the adaptation rate of the adaptive beamformer unit the speed with which the beamformer unit reacts on an adaptation command to change beamforming operation as e.g. changing target enhancement or noise suppression direction.
  • the adaptation rate accords with an adaptation time constant to change from one beamforming polar pattern to another.
  • the compensator thereby estimates the prevailing situation of feedback to be suppressed e.g. by a correlation technique between the signal applied to the output converter arrangement and the signal received from the input converter arrangement as e.g. described in the EP 0 656 737.
  • the adaptation rate of the compensator accords with an adaptation time constant too. Whenever the loop gain along the compensating feedback signal path increases, this is caused by an increasing amount of feedback to be suppressed and thus to be compensated.
  • the adaptation rate of the beamformer unit is to be slowed down so that the compensator feedback signal may model the response of the beamformer unit too.
  • the adaptation rate of converting i.e. of beamforming is slowed down with increasing loop gain along the feedback signal path.
  • amplification of the transfer characteristic representing beamforming is minimized at one or more than one specific angles which accord to angles at which the feedback to be suppressed predominantly impinges on the input converter arrangement.
  • the compensator may still model the beamformer without losing the established minimum or minima in the direction of the said specific angles.
  • the feedback to be suppressed is a narrow band acoustical signal, thus in a further improvement of the method according to the present invention, it is not necessary - so as to deal with a feedback to be suppressed - to control and especially to slow down the adaptation rate of beamforming conversion in the entire frequency range beamforming is effective at, but it suffices to controllably adapt the adaptation rate of the beamforming conversion at frequencies which are significant for the feedback signal to be suppressed. Therefore, in a further preferred embodiment of the present invention, controlling of the adaptation rate of the beamforming conversion is performed frequency selectively.
  • the principal according to the present invention may be applied at hearing devices where signal processing is performed in analog technique, it is preferred to perform the method in devices where signal processing is performed digitally.
  • at least signal processing in the beamforming conversion as well as along the feedback compensation path is performed in frequency domain, whereby time domain to frequency domain conversion may be realised in a known manner, be it by FFT, DCT, wavelet transform or other suitable transforms.
  • the respective reconversion for the signal applied to the output converter arrangement is performed with the respective inverse processes.
  • the adaptation rate is controlled at selected frequencies in dependency of the compensator gain at these selected frequencies.
  • beamforming is only effective with respect to the feedback to be suppressed at specific frequencies or at a specific frequency band on the one hand the control of the adaptation rate of beamforming is in fact only to be performed at these specific frequencies or for the addressed frequency band. Further, selecting minimum amplification at the specific feedback impingement angles must be provided at the beamformer only for the specific frequencies or for the frequency band of the feedback to be suppressed too. Thus, this leads to the recognition that in fact beamforming may be subdivided in beamforming for frequencies which are not significant for the feedback to be suppressed and beamforming for frequencies or the frequency band which is specific for the feedback signal to be suppressed.
  • beamforming in the addressed specific frequencies may be performed and its adaptation rate controlled independently from tailoring beamforming at frequencies which are not specific for the feedback signal to be suppressed.
  • This beamforming may be performed at adaption rates which are independent from feedback compensation and thus faster and which generates a beam which is not dealing with the specific impinging angles of the feedback signal to be suppressed.
  • performing controlling of beamforming is done selectively at frequencies which are significant for the feedback to be suppressed.
  • Further preferred minimalising the amplification of the beamforming transfer characteristic is only done at specific angles in a frequency selection manner.
  • two independent beamforming actions are superimposed, a first dealing with the generically desired beamforming behaviour, a second dealing with feedback suppression as concerns frequencies and as concerns beamshaping. It becomes possible e.g. to switch off first beamforming, thereby maintaining the second and thereby preventing acoustical feedback to become effective.
  • the method according to the present invention may be applied to behind-the-ear hearing devices or to in-the-ear hearing devices, monaural or binaural systems, and further may be applied to such devices which are conceived as ear protection devices i.e. protecting the human ear from excess acoustical load, or to hearing improvement devices be it just to improve or facilitate hearing by an individual, or in the sense of a hearing aid, to improve hearing of a hearing impaired individual.
  • ear protection devices i.e. protecting the human ear from excess acoustical load
  • hearing improvement devices be it just to improve or facilitate hearing by an individual, or in the sense of a hearing aid, to improve hearing of a hearing impaired individual.
  • a hearing device which comprises:
  • Fig. 3 there is schematically shown, by means of a signal flow-/functional block-diagram a device according to the present invention, whereat the method according to the invention is realised.
  • the device comprises an input acoustical/electrical converter arrangement 10, which cooperate with a beamformer unit 12.
  • the conversion characteristics of the input converter arrangement 10 together with signal processing in beamformer unit 12 provides a beamformer characteristic between acoustical input E 10 to input converter arrangement 10 and electrical output A 12 of the beamformer unit 12.
  • the beamformer unit 12 has an adaptation control input C 12A and ⁇ adaptation rate control input C 12R .
  • the transfer characteristic between E 10 and A 12 has an amplification which is dependent on the angle ⁇ at which acoustical signals impinge on the acoustical port of input converter 10.
  • ⁇ the angle at which acoustical signals impinge on the acoustical port of input converter 10.
  • the transfer characteristic in polar representation the beam B, may be varied with respect to its characteristics as e.g. with respect to target direction, maximum amplification etc. as shown in dotted line within block 12.
  • Variation of the beam characteristic B is controlled by control input C 12A which latter is, as shown in dotted line, normally connected to a processing unit 14 for adapting the beam characteristic B e.g. to prevailing acoustical situations automatically or program controlled or by an individual wearing the hearing device.
  • Beamforming units which may be adapted are known. One example thereof is described in the WO 00/33634.
  • Variation of the beam characteristic B may also be caused at the beamformer itself, i.e. by beamformer internal reasons.
  • the input C 12A and control signals applied thereto are merely a schematic representation of beam characteristic variation ability or occurrence.
  • the electrical output of beamforming unit 12, A 12 is operationally connected to an input E 14 , of the signal processing 14 unit whereat input signals are processed and output at an output A 14 operationally connected to an electric input E 16 of an output electrical to acoustical converter arrangement 16 so as to provide desired ear protections or hearing improvement to the individual carrying such device.
  • ear protecting ability the ability of reducing or even cancelling acoustical signals which impinge on the input converter arrangement 10, so as to protect individual's hearing or even provide the individual with silent perception in non-vanishing acoustical surroundings.
  • hearing improvement we understand the improvement of individual's hearing in an acoustical surrounding, be it for customary applications of normal hearing individual or be it in the sense of hearing aid to improve individual's impaired hearing.
  • acoustical feedback AFB between the acoustical output of the output converter 16 and acoustical input E 10 of the input converter arrangement 10.
  • a feedback compensator 18 whereat the prevailed acoustical feedback AFB, which is to be suppressed, is estimated e.g. with a correlation technique, correlating the signal applied to output converter 16 with a signal dependent on the output of input converter 10 as shown in dashed line at A.
  • the gain G of compensator 18 is estimated so a to compensate for the AFB by negative feedback.
  • compensator unit 18 By means of compensator unit 18, a signal as predicted is fed back to the input of processor unit 14 downstream the output of beamformer unit 12 so as to compensate for the feedback AFB.
  • the compensator unit 18 has an input E18 which is operationally connected to the output A 14 of the processing unit 14 and has an output A 18 which is superimposed to the output E 12 of beamformer unit 12, the result of such superimposing being input to input E 14 of processing unit 14.
  • the compensator unit 18 which computes estimation of the acoustical feedback to be suppressed, has an adaptation rate in the range of several hundred ms and is thus considerably slower than the adaptation rate of beamforer unit 12.
  • the compensator 18 will not be able to accurately rapidly deal with the varied situation with respect to acoustical feedback AFB.
  • the loop gain may at be least estimated e.g. by multiplying the linear gains along the loop, primarily consisting of the compensator 18 and the processing unit 14 in Fig. 3 or by adding these gains in dB.
  • adaptation rate control of beamformer unit 12 is performed in dependency of the loop gain along the feedback loop with compensator unit 18.
  • the rate control input C 12R to beamforming unit 12 is operationally connected to a loop gain output A G of unit 18.
  • the direction with which acoustical feedback signals AFB to be suppressed impinge on the acoustical port of the input converter 10 is specific. Therefore, at the beamformer unit 12, there is generated a beam characteristic B AFB , as shown in Fig. 4, which has minimum amplification for these specific angle or, as shown e.g. for an in-the-ear hearing device, at two specific angles ⁇ AFB .
  • B AFB beam characteristic B AFB
  • acoustical feedback AFB to be suppressed occurs substantially within a specific frequency band.
  • This frequency band is dependent, among others, on the specific output converter 16 used, the type of device e.g. in-the-ear or outside-the-ear device. Therefore, in a further improved embodiment, overall feedback suppression may be performed within that specific frequency band, thereby leaving beamforming in frequencies not within this specific frequency band unaffected and tailored according to needs different from acoustic feedback suppression.
  • beamforming B AFB for minimum amplification of acoustical feedback AFB to be suppressed is performed frequency selectively for frequencies f AFB of the acoustical feedback signal AFB. Beamforming for frequencies f AFB which are not significantly present in the acoustical feedback AFB is performed by a second beamforming B AFB which may be selected independently from B AFB .
  • Frequency selective feedback compensation and adaptation beamforming may easily be realised, if at least beamforming in unit 12 as well as compensation in unit 18 are performed in frequency domain respectively in sub-bands. Beamforming is then realised at the frequencies f AFB with minimum amplification at the specific angles ⁇ AFB , whereas beamforming at other frequencies f AFB is performed according to other needs. Consequently the adaptation rate of beamforming in unit 12 is only controlled by the gain of compensator unit 18 at the frequencies f AFB .
  • beamforming B AFB may be maintained active to suppress feedback also in such "quiet" mode.
  • the loop gain, as estimated in compensator unit 18, may be compared with a threshold value and adaptation rate control at C 12R is only established, if the instantaneous loop gain at least reaches such threshold.
  • the control of the adaptation rate may then be lowered to practically zero, which means that beamforming is switched off for frequencies f AFB .
  • such switching may be performed steadily which may be realised on the one hand by lowering the adaptation rate of B AFB steadily and/or by reducing beamforming amplification of B AFB steadily.

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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)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Amplifiers (AREA)
EP04006073.3A 2004-03-15 2004-03-15 Suppression de la réaction acoustique Expired - Lifetime EP1469702B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04006073.3A EP1469702B1 (fr) 2004-03-15 2004-03-15 Suppression de la réaction acoustique
DK04006073.3T DK1469702T3 (en) 2004-03-15 2004-03-15 Feedback suppression

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Application Number Priority Date Filing Date Title
EP04006073.3A EP1469702B1 (fr) 2004-03-15 2004-03-15 Suppression de la réaction acoustique

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EP1469702A2 true EP1469702A2 (fr) 2004-10-20
EP1469702A3 EP1469702A3 (fr) 2004-11-17
EP1469702B1 EP1469702B1 (fr) 2016-11-23

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007042025A1 (fr) * 2005-10-11 2007-04-19 Widex A/S Prothèse auditive et procédé de traitement de signaux d'entrée dans une prothèse auditive
EP2357850A3 (fr) * 2009-12-22 2011-09-21 Siemens Medical Instruments Pte. Ltd. Procédé et appareil auditif de reconnaissance et de soumission de contre-réactions à l'aide d'un microphone de guidage
WO2011027005A3 (fr) * 2010-12-20 2011-12-01 Phonak Ag Procédé et système d'amélioration de la voix dans une salle
EP2169984A3 (fr) * 2008-09-26 2012-05-30 Siemens Medical Instruments Pte. Ltd. Prothèse auditive avec système de microphone directif et procédé de fonctionnement d'une telle prothèse auditive
CN103797816A (zh) * 2011-07-14 2014-05-14 峰力公司 语音增强***和方法
US8804979B2 (en) 2010-10-06 2014-08-12 Oticon A/S Method of determining parameters in an adaptive audio processing algorithm and an audio processing system
EP3249955A1 (fr) * 2016-05-23 2017-11-29 Oticon A/s Prothèse auditive configurable comprenant une unité de filtrage à focalisateur et une unité d' amplification

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3787316A1 (fr) * 2018-02-09 2021-03-03 Oticon A/s Dispositif auditif comprenant une unité de filtrage formant des faisceaux afin de réduire le feedback

Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0656737A1 (fr) * 1993-11-10 1995-06-07 Phonak Ag Prothèse auditive avec suppression du couplage acoustique
WO2000019605A2 (fr) * 1998-09-30 2000-04-06 House Ear Institute Dispositif adaptatif de suppression de l'effet larsen a bande limitee destine aux protheses auditives
WO2000033634A2 (fr) * 2000-03-31 2000-06-15 Phonak Ag Procede pour predeterminer la caracteristique de transmission d'un ensemble microphone et ensemble microphone
EP1080606A1 (fr) * 1998-05-19 2001-03-07 Audiologic Hearing Systems, L.P. Ameliorations apportees a l'annulation de la reaction acoustique

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0656737A1 (fr) * 1993-11-10 1995-06-07 Phonak Ag Prothèse auditive avec suppression du couplage acoustique
EP1080606A1 (fr) * 1998-05-19 2001-03-07 Audiologic Hearing Systems, L.P. Ameliorations apportees a l'annulation de la reaction acoustique
WO2000019605A2 (fr) * 1998-09-30 2000-04-06 House Ear Institute Dispositif adaptatif de suppression de l'effet larsen a bande limitee destine aux protheses auditives
WO2000033634A2 (fr) * 2000-03-31 2000-06-15 Phonak Ag Procede pour predeterminer la caracteristique de transmission d'un ensemble microphone et ensemble microphone

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Title
HERBORDT W ET AL: "Computationally Efficient Frequency-Domain Combination of Acoustic Echo Cancellation and Robust Adaptive Beamforming" PROCEEDINGS EUROSPEECH, vol. 2, September 2001 (2001-09), pages 1001-1004, XP007004503 AALBORG, DANMARK *
HOSHUYAMA O ET AL: "A ROBUST ADAPTIVE BEAMFORMER FOR MICROPHONE ARRAYS WITH A BLOCKING MATRIX USING CONSTRAINED ADAPTIVE FILTERS" IEEE TRANSACTIONS ON SIGNAL PROCESSING, IEEE, INC. NEW YORK, US, vol. 47, no. 10, October 1999 (1999-10), pages 2677-2684, XP000947154 ISSN: 1053-587X *
HSIANG-FENG CHI, SHAWN X. GAO, SIGFRID D. SOLI, ABEER ALWAN: "Band-limited feedback cancellation with a modified filtered-X LMS algorithm for hearing aids" SPEECH COMMUNICATION, vol. 39, no. 1-2, January 2003 (2003-01), pages 147-161, XP002295470 ELSEVIER SCIENCE *
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8189833B2 (en) 2005-10-11 2012-05-29 Widex A/S Hearing aid and a method of processing input signals in a hearing aid
AU2005337382B2 (en) * 2005-10-11 2009-06-11 Widex A/S Hearing aid and a method of processing input signals in a hearing aid
CN101273663B (zh) * 2005-10-11 2011-06-22 唯听助听器公司 助听器和在助听器中处理输入信号的方法
WO2007042025A1 (fr) * 2005-10-11 2007-04-19 Widex A/S Prothèse auditive et procédé de traitement de signaux d'entrée dans une prothèse auditive
EP2169984A3 (fr) * 2008-09-26 2012-05-30 Siemens Medical Instruments Pte. Ltd. Prothèse auditive avec système de microphone directif et procédé de fonctionnement d'une telle prothèse auditive
EP2357850A3 (fr) * 2009-12-22 2011-09-21 Siemens Medical Instruments Pte. Ltd. Procédé et appareil auditif de reconnaissance et de soumission de contre-réactions à l'aide d'un microphone de guidage
US8588444B2 (en) 2009-12-22 2013-11-19 Siemens Medical Instruments Pte. Ltd. Method and hearing device for feedback recognition and suppression with a directional microphone
US8804979B2 (en) 2010-10-06 2014-08-12 Oticon A/S Method of determining parameters in an adaptive audio processing algorithm and an audio processing system
WO2011027005A3 (fr) * 2010-12-20 2011-12-01 Phonak Ag Procédé et système d'amélioration de la voix dans une salle
CN103329566A (zh) * 2010-12-20 2013-09-25 峰力公司 用于房间中的语音增强的方法和***
CN103797816A (zh) * 2011-07-14 2014-05-14 峰力公司 语音增强***和方法
CN103797816B (zh) * 2011-07-14 2017-02-15 索诺瓦公司 语音增强***和方法
EP3249955A1 (fr) * 2016-05-23 2017-11-29 Oticon A/s Prothèse auditive configurable comprenant une unité de filtrage à focalisateur et une unité d' amplification
US10484800B2 (en) 2016-05-23 2019-11-19 Oticon A/S Configurable hearing aid comprising a beamformer filtering unit and a gain unit

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Publication number Publication date
EP1469702A3 (fr) 2004-11-17
EP1469702B1 (fr) 2016-11-23
DK1469702T3 (en) 2017-02-13

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