EP1853089B2 - Méthode pour la suppression de la rétroaction et pour l'éxpansion spéctrale pour des appareils de correction auditive - Google Patents

Méthode pour la suppression de la rétroaction et pour l'éxpansion spéctrale pour des appareils de correction auditive Download PDF

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Publication number
EP1853089B2
EP1853089B2 EP07106332.5A EP07106332A EP1853089B2 EP 1853089 B2 EP1853089 B2 EP 1853089B2 EP 07106332 A EP07106332 A EP 07106332A EP 1853089 B2 EP1853089 B2 EP 1853089B2
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Prior art keywords
signal
feedback
spectral
input signal
mixing
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EP07106332.5A
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German (de)
English (en)
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EP1853089B1 (fr
EP1853089A2 (fr
EP1853089A3 (fr
Inventor
Ulrich Kornagel
Tom Weidner
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Sivantos GmbH
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Siemens Audiologische Technik 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
    • H04R25/45—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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band processing

Definitions

  • the present invention relates to a method for suppressing feedback whistles in hearing devices by determining or predetermining a frequency range that is subject to feedback risk, and receiving an input signal having a spectral component in the feedback-prone frequency range.
  • the present invention relates to corresponding hearing devices.
  • the feedback whistles could be suppressed for example by so-called notch filter.
  • the loop gain is reduced at the frequency at which feedback or feedback whistles would occur. Due to this reduction, the amplitude condition for feedback whistles is no longer met.
  • Another way to suppress the feedback whistles is to perform a corresponding signal compensation.
  • This feedback compensation approach digitally replicates the feedback path and compensates for its effect.
  • these approaches to feedback reduction can significantly audibly distort the output signal, especially if the input stage of the acoustic system is designed for only a low spectral bandwidth.
  • EP 0 969 692 A1 an apparatus and method for processing speech.
  • LPC analysis Linear Predictive Coding
  • the object of the present invention is therefore to improve the signal quality of acoustic systems which are subject to feedback.
  • this object is achieved by a method according to claim 1.
  • the invention is based on the idea to substitute a part of an internal signal of the hearing by a synthetic signal and to mix with this. By substituting, the amplitude condition for the feedback whistling is no longer satisfied.
  • the synthetic signal is generated with a nonlinearity from the input signal.
  • a synthetic signal in response to the input signal can be generated.
  • the synthetic signal may also be generated by frequency shifting a spectral band of the input signal. Also by this can be easily generated in the desired frequency range, a synthetic signal in response to the input signal.
  • the spectral envelope of a signal mixed from the synthetic signal and a part of the input signal is corrected by means of LPC analysis.
  • the signal character of the original input signal can be well maintained without feedback.
  • the correction can be done in combination with a common shape filtering.
  • further processing of the reduced signal and mixing is performed by adding the synthetic signal to the further processed, reduced signal just prior to signal output to an output transducer.
  • the suppression of the feedback whistle can be completely independent of the internal signal processing. This means that existing systems can also be easily retrofitted.
  • the input signal can be processed in a plurality of channels, wherein the substitution or mixing takes place only in that channel with the backward-endangered frequency range.
  • the effect of the feedback suppression can be selectively limited to one or more channels. It is advantageous if one or more features of the respective signal are obtained from at least two of the channels and considered for substitution or mixing. On the basis of the characteristics from the other channels, the quality of the synthetic signal can be improved.
  • signal components which cause the feedback whistling should be substituted.
  • This signal substitution should take place in the feedback-endangered frequency range. In this frequency range, therefore, not only the signal picked up by the microphone is processed and delivered via the receiver, but also the synthetically generated signal is processed or output.
  • the feedback loop can be interrupted and it can be prevented in case of linear system behavior unwanted oscillation.
  • the signal picked up by the microphone can be mixed with the synthetic signal in any ratio. This mixing can also be considered as a partial substitution. In this case, the effective amplification can be lowered to such an extent in the feedback loop that the amplitude condition for feedback is no longer satisfied. As a result, a certain proportion of the natural signal is retained.
  • Measures for generating synthetic signal components include, for example, the use of non-linearities, i. H. non-linear components with, for example, quadratic characteristic, magnitude characteristic, etc., or modulation approaches in which frequency components are spectrally shifted.
  • a device for correcting the spectral envelope should be provided in order to preserve a natural sound as much as possible.
  • a tool for this is, for example, the LPC analysis (linear predictive coding) in combination with shape filtering.
  • FIG. 1 is presented a concrete implementation example.
  • the original input signal of a microphone 2 is split into two complementary spectral ranges.
  • the switch 1 contains a band-stop filter 3 and a band-pass filter 4.
  • the signal is divided into a band-pass signal S_fb and a spectrally complementary signal S_kompl.
  • bandpass filtering low-pass or high-pass filtering can also be used.
  • the spectral range of the bandpass signal S_fb represents the band in which feedback whistles would arise without countermeasures.
  • the bandpass signal S_fb is multiplied by a factor a in a multiplier 5. Multiplied by this factor a (where 0 ⁇ a ⁇ 1), the bandpass signal S_fb is partially added back to the complementary signal S_kompl in the adder 6. The signal thus obtained passes through the regular signal processing 7, which would pass through the original signal even without compensation measure for feedback whistles.
  • the output signal of the microphone 2 is also used to generate the synthetic signal in the spectral range of the bandpass signal S_fb corresponding to the lower path of FIG. 1 used.
  • a suitable spectral band is cut out by means of a filter and copied into the spectral band of interest.
  • Corresponding means for generating a synthetic signal 8 are in the lower path of the circuit diagram of FIG. 1 shown.
  • the synthetic signal is weighted by a factor b. This weighting with the aid of a multiplier 9 can take place prior to entry into the means for generating the synthetic signal 8.
  • the synthetic signal is adjusted by means of a signal processing module 10 so that it can be added to the signal of the signal processing 7 of the upper path. This addition takes place in an adder 11 immediately before the signal output to an in FIG. 1 not shown output transducer.
  • the factors a and b are coordinated. They define the mixing ratio of synthetic and real signal component in the spectral range of the bandpass signal S_fb. The larger the factor a, the smaller must be the factor b and vice versa, so that the feedback whistling can be suppressed. In a first extreme case, a is close to 1 and b is close to 0, so that practically no signal substitution by a synthetic signal takes place in the spectral range of the bandpass signal S_fb. In a second extreme case, a is close to 0 and b is close to 1, which results in almost complete signal substitution by the synthetic signal in the spectral range of the bandpass signal S_fb.
  • FIG. 2 is a circuit diagram of a multi-channel device with subband synthesis and feature extraction reproduced.
  • the output signal of a microphone 20 is again decomposed into two channels.
  • the first filter is, for example, a high-pass filter 21 and the second filter is a low-pass filter 22.
  • the high-pass signal corresponds to a channel A and the low-pass signal corresponds to a channel B.
  • a hearing aid signal processing unit 23 is arranged in the channel A and a hearing aid signal processing unit 24 in the channel B.
  • the output signals of the two signal processing units 23 and 24 are added in an adder 25 and sent the sum signal to a handset 26.
  • a part of the acoustic output signal of the handset 26 is fed back to the microphone 20 via a feedback path 27. Since the feedback takes place primarily in the high-frequency channel A, a mixing stage 28 is connected between the high-pass filter 21 and the hearing aid signal processing unit 23, with which a synthetic signal can be mixed into the high-frequency channel.
  • a mixing stage 28 is connected between the high-pass filter 21 and the hearing aid signal processing unit 23, with which a synthetic signal can be mixed into the high-frequency channel.
  • To generate the synthetic signal one or more features of the high-frequency channel A are obtained by a feature extraction unit 29 and also one or more features of the low-frequency channel B by a feature extraction unit 30.
  • the features obtained by the units 29 and 30 are evaluated or compared in an evaluation unit 31.
  • the evaluation unit 31 is based on a model 32. This model includes a prior knowledge of ratios of high-pass to low-pass shares.
  • the evaluation unit 31 determines, for example, based on the spectral envelope, which is available as a feature from the high-frequency channel A, and the model 32, a mixing ratio for the mixing stage 28.
  • the evaluation unit 31 controls a signal generator 33, for. As a vocoder.
  • the signal generator 33 then supplies the synthetic signal to the mixer 28.
  • FIG. 2 shows a two-channel hearing aid.
  • the invention can also be applied to any other devices with two or more channels.

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  • Acoustics & Sound (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Steroid Compounds (AREA)
  • Amplifiers (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Networks Using Active Elements (AREA)

Claims (7)

  1. Procédé de suppression de sifflements de rétroaction dans une prothèse auditive,
    - en déterminant ou prescrivant un domaine de fréquences, qui est menacé de rétroaction, et
    - en recevant un signal d'entrée ayant une composante spectrale dans le domaine de fréquences menacé de rétroaction, caractérisé en ce que
    - on réduit l'amplitude ( 5 ) de la composante spectrale mentionnée du signal d'entrée de manière à ce qu'il reste une composante spectrale réduite, et
    - on mélange ( 11 ) la composante spectrale réduite à un signal ( 8 ) synthétique en un signal global dans le domaine de fréquences menacé de rétroaction, de manière à ce que, dans le domaine de fréquences menacé de rétroaction, la puissance du signal global, après le mélange, corresponde sensiblement à la puissance de la composante spectrale mentionnée avant la réduction
    - dans lequel on corrige l'enveloppe spectrale du signal mélangé à l'aide d'une analyse LPC.
  2. Procédé suivant la revendication 1, dans lequel on produit le signal synthétique ayant une non-linéarité à partir du signal d'entrée.
  3. Procédé suivant la revendication 1 ou 2, dans lequel on produit le signal synthétique par décalage de fréquences d'une bande spectrale du signal d'entrée.
  4. Procédé suivant la revendication 1, dans lequel on effectue la correction en combinaison avec un filtrage de forme.
  5. Procédé suivant l'une des revendications précédentes, dans lequel, avant le mélange, on effectue un traitement ( 7 ) supplémentaire du signal réduit et le mélange par addition ( 11 ) du signal synthétique en le signal réduit, retraité supplémentairement, juste avant l'émission du signal sur un convertisseur de sortie.
  6. Procédé suivant l'une des revendications précédentes, dans lequel on traite le signal d'entrée en plusieurs canaux ( A, B ) et on effectue le mélange seulement dans le canal ayant le domaine de fréquences menacé de rétroaction.
  7. Procédé suivant la revendication 6, dans lequel on obtient respectivement une ou plusieurs caractéristiques du signal (29, 30) respectif à partir d'au moins deux des canaux ( A, B ) et on en tient compte pour le mélange.
EP07106332.5A 2006-05-04 2007-04-17 Méthode pour la suppression de la rétroaction et pour l'éxpansion spéctrale pour des appareils de correction auditive Active EP1853089B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006020832.3A DE102006020832B4 (de) 2006-05-04 2006-05-04 Verfahren zum Unterdrücken von Rückkopplungen bei Hörvorrichtungen

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EP1853089A2 EP1853089A2 (fr) 2007-11-07
EP1853089A3 EP1853089A3 (fr) 2007-12-26
EP1853089B1 EP1853089B1 (fr) 2009-07-29
EP1853089B2 true EP1853089B2 (fr) 2013-09-25

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US (1) US8571243B2 (fr)
EP (1) EP1853089B2 (fr)
AT (1) ATE438267T1 (fr)
DE (2) DE102006020832B4 (fr)
DK (1) DK1853089T4 (fr)

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US6810414B1 (en) * 2000-02-04 2004-10-26 Dennis A. Brittain System and methods for easy-to-use periodic network data capture engine with automatic target data location, extraction and storage
EP2148526B1 (fr) * 2008-07-24 2020-08-19 Oticon A/S Modification de contenu spectral pour évaluation de canal de réponse robuste
DE102008046966B3 (de) * 2008-09-12 2010-05-06 Siemens Medical Instruments Pte. Ltd. Hörgerät und Betrieb eines Hörgeräts mit Frequenztransposition
DK2200341T3 (en) 2008-12-16 2015-06-01 Siemens Audiologische Technik A method for driving of a hearing aid as well as the hearing aid with a source separation device
AU2009339343A1 (en) * 2009-02-06 2011-08-18 Oticon A/S Spectral band substitution to avoid howls and sub-oscillation
WO2011026113A2 (fr) * 2009-08-31 2011-03-03 Massachusetts Eye & Ear Infirmary Alertes associées à un effet larsen dans un appareil auditif
DK2309777T3 (da) * 2009-09-14 2013-02-04 Gn Resound As Et høreapparat med organer til at de-korrelere indgangs- og udgangssignaler
DK2309776T3 (da) 2009-09-14 2014-10-27 Gn Resound As Høreapparat med midler til adaptiv feedbackkompensation
DE102010006154B4 (de) 2010-01-29 2012-01-19 Siemens Medical Instruments Pte. Ltd. Hörgerät mit Frequenzverschiebung und zugehöriges Verfahren
EP2375785B1 (fr) 2010-04-08 2018-08-29 GN Hearing A/S Améliorations de la stabilité des appareils auditifs
EP2579252B1 (fr) * 2011-10-08 2020-04-22 GN Hearing A/S Améliorations de l'audibilité de la parole et de la stabilité dans les dispositifs auditifs
DE102011087692B4 (de) * 2011-12-05 2014-07-10 Siemens Medical Instruments Pte. Ltd. Hörvorrichtung und Verfahren zur Verbesserung der Wahrnehmbarkeit eines Anteils eines Eingangssignals für einen Benutzer der Hörvorrichtung
US9020172B2 (en) * 2013-03-15 2015-04-28 Cochlear Limited Methods, systems, and devices for detecting feedback
EP2874409B1 (fr) * 2013-11-15 2018-09-05 Oticon A/s Dispositif d'aide auditive avec une estimation de la voie de réaction adaptative
US9763006B2 (en) 2015-03-26 2017-09-12 International Business Machines Corporation Noise reduction in a microphone using vowel detection
TWI603627B (zh) * 2015-07-03 2017-10-21 元鼎音訊股份有限公司 處理聲音段之方法及其電腦程式產品及助聽器
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EP0415677B1 (fr) † 1989-08-30 1999-06-23 Gn Danavox A/S Prothèse auditive avec compensation de la réaction acoustique
US5305307A (en) † 1991-01-04 1994-04-19 Picturetel Corporation Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths
US5394475A (en) † 1991-11-13 1995-02-28 Ribic; Zlatan Method for shifting the frequency of signals
EP1216598B1 (fr) † 1999-09-10 2005-02-09 Starkey Laboratories, Inc. Traitement de signaux audio
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EP1471765A2 (fr) † 2003-03-31 2004-10-27 Unitron Hearing Ltd. Suppression adaptive de rétroaction
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Also Published As

Publication number Publication date
EP1853089B1 (fr) 2009-07-29
DK1853089T4 (da) 2014-01-06
DE502007001153D1 (de) 2009-09-10
ATE438267T1 (de) 2009-08-15
US8571243B2 (en) 2013-10-29
EP1853089A2 (fr) 2007-11-07
DE102006020832B4 (de) 2016-10-27
US20070269068A1 (en) 2007-11-22
DE102006020832A1 (de) 2007-11-15
DK1853089T3 (da) 2009-11-16
EP1853089A3 (fr) 2007-12-26

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