EP1853089A2 - 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
EP1853089A2
EP1853089A2 EP07106332A EP07106332A EP1853089A2 EP 1853089 A2 EP1853089 A2 EP 1853089A2 EP 07106332 A EP07106332 A EP 07106332A EP 07106332 A EP07106332 A EP 07106332A EP 1853089 A2 EP1853089 A2 EP 1853089A2
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Prior art keywords
signal
input signal
mixing
spectral
feedback
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EP07106332A
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German (de)
English (en)
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EP1853089B2 (fr
EP1853089B1 (fr
EP1853089A3 (fr
Inventor
Ulrich Kornagel
Tom Weidner
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Sivantos GmbH
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Siemens Audioligische Technik GmbH
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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
    • 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. Moreover, the present invention relates to a method for spectral expansion in a hearing device whose input signal has a limited frequency range. In addition, 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.
  • the object of the present invention is therefore to improve the signal quality of acoustic systems which are subject to feedback or whose input stage is relatively narrow-band.
  • this object is achieved by a method for suppressing feedback whistling in a hearing device by determining or predetermining a frequency range that is subject to feedback, and receiving an input signal with a spectral component in the feedback-prone frequency range, and reducing said spectral component of the input signal and mixing the reduced spectral component with a synthetic signal, so that in the said spectral range the power of the total signal substantially corresponds to the power before reducing.
  • the invention provides a hearing device with a feedback suppression device and a signal input device for receiving an input signal
  • the feedback suppression means comprises a reduction unit for reducing a spectral component of the input signal and a mixing unit for mixing the reduced spectral component with a synthetic signal, such that in said spectral range the power of the overall signal substantially corresponds to the power before reduction.
  • 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 from the input signal. This also makes it possible to generate a synthetic signal as a function of the input signal in a simple manner in the desired frequency range.
  • 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.
  • a method for spectral expansion in a hearing apparatus by receiving an input signal whose spectrum has a limited a priori a limited frequency range and mixing the input signal or the input signal in a further processed form with a synthetic signal whose spectrum is at least partially outside the limited frequency range.
  • the invention provides a corresponding hearing device with a signal input device for receiving an input signal whose spectrum a priori has a limited frequency range and a mixer for mixing the input signal or the input signal in a further processed form with a synthetic signal whose spectrum is at least partially outside the limited Frequency range is.
  • the inventive mixing of the input signal with a synthetic signal a spectral expansion is achieved, which leads to an output signal, which is perceived as a higher quality. This is the spectral expansion achieved by a relatively small amount of hardware.
  • the inventive spectral extension can be used to the extent that the bandwidth is not limited in the output signal.
  • the synthetic signal is generated by copying a portion of the limited frequency range of the input signal. Specifically, mirror frequencies can be used when copying. Thus, an input signal dependency of the synthetic signal can be easily generated.
  • the mixing of the input signal with the synthetic signal can be interrupted if a non-linear behavior of the hearing device is detected. In this way, a noisy feedback signal can be prevented, which would not tear off by itself.
  • signal components which cause the feedback whistling are to be substituted become.
  • 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.
  • One tool for this is, for example, the LPC analysis (linear predictive coding) in combination with shape filtering.
  • a concrete implementation example is presented.
  • 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.
  • 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 shown in the lower path of the circuit diagram of FIG.
  • 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 output converter, not shown in FIG 1.
  • 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 shows a circuit diagram of a multi-channel device with subband synthesis and feature extraction.
  • 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, is between the high-pass filter 21 and the hearing aid signal processing unit 23 a mixer 28 connected, with which a synthetic signal can be mixed in the high-frequency channel.
  • a mixer 28 connected, with which a synthetic signal can be mixed in 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 device.
  • the invention can also be applied to any other devices with two or more channels.
  • the above-mentioned mixing or substitution can also be used for spectral broadening.
  • an acoustic system having at least one input (eg microphone, receiver) and at least one output (eg listener) one or more frequency ranges of the signal to be output are to be generated synthetically.
  • the input stage of the acoustic system can be designed for a lower spectral bandwidth or in systems whose input stage can not technically exceed a certain bandwidth, it is possible to extend the bandwidth of the output signal to a larger target bandwidth.
  • the advantage of this is that the spectral expansion is possible by a relatively small amount of hardware.
  • the bandwidth of the input stage does not include the bandwidth of the output signal.
  • wireless audio connection wireless audiolink
  • the limiting element in the input stage is the receiver, which delivers a maximum of 8 kHz. Since frequencies up to 12 kHz are required in hi-fi operation, the band is synthesized from 8 kHz to 12 kHz.
  • Another implementation variant for the spectral expansion according to the invention relates to hearing aids.
  • the synthetic generation of spectral components above 8 kHz is very advantageous for hearing aids, since above this frequency is to be feared feedback whistles.
  • Even without correction of the spectral envelope a clear spectral expansion can be perceived by copying lower frequency bands into the band above 8 kHz.
  • the utilization of image frequencies outside of the Nyquist band can serve as the copying process, and the "by-products" of frequency shift operations are purposefully exploited.
  • a closed feedback loop may arise as follows: a natural spectral component becomes a synthetic one according to a given algorithm Spectral component generated; interfering non-linearity, in turn, generates out-of-band spectral components with synthetic spectral components; the newly generated spectral components are fed back to the microphone; The newly generated spectral components again serve as the basis for the generation of synthetic spectral components, whereby the loop is closed. In extreme cases, this creates a noisy feedback signal that does not break off on its own.
  • a remedy against the noise-like feedback signal can be provided that the non-linear behavior of the system is detected, for example by overdrive detection. If the system behaves non-linearly for some time (eg, oversteer), the synthetic generation is momentarily interrupted (eg, ⁇ 1 second) so that the self-stabilized feedback noise can be broken off.

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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)
  • Networks Using Active Elements (AREA)
  • Spectrometry And Color Measurement (AREA)
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)

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DE102006020832.3A DE102006020832B4 (de) 2006-05-04 2006-05-04 Verfahren zum Unterdrücken von Rückkopplungen bei Hörvorrichtungen

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

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EP (1) EP1853089B2 (fr)
AT (1) ATE438267T1 (fr)
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DK (1) DK1853089T4 (fr)

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EP2309777A1 (fr) * 2009-09-14 2011-04-13 GN Resound A/S Appareil auditif permettant de dé-corréler les signaux d'entrée et de sortie
EP2164283A3 (fr) * 2008-09-12 2013-03-27 Siemens Medical Instruments Pte. Ltd. Appareil auditif et fonctionnement d'un appareil auditif doté d'une transposition de fréquence
US10524062B2 (en) 2009-09-14 2019-12-31 Gn Hearing A/S Hearing aid with means for adaptive feedback compensation

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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
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
US9025801B2 (en) 2009-08-31 2015-05-05 Massachusetts Eye & Ear Infirmary Hearing aid feedback noise alarms
DE102010006154B4 (de) 2010-01-29 2012-01-19 Siemens Medical Instruments Pte. Ltd. Hörgerät mit Frequenzverschiebung und zugehöriges Verfahren
JP5341128B2 (ja) 2010-04-08 2013-11-13 ジーエヌ リザウンド エー／エス 補聴器における安定性の改善
DK2579252T3 (da) * 2011-10-08 2020-06-02 Gn Hearing As Forbedringer af stabilitet og talehørbarhed for høreapparater
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
DK2874409T3 (en) * 2013-11-15 2018-12-10 Oticon As Hearing aid with adaptive feedback path estimation
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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Publication number Priority date Publication date Assignee Title
EP2164283A3 (fr) * 2008-09-12 2013-03-27 Siemens Medical Instruments Pte. Ltd. Appareil auditif et fonctionnement d'un appareil auditif doté d'une transposition de fréquence
EP2309777A1 (fr) * 2009-09-14 2011-04-13 GN Resound A/S Appareil auditif permettant de dé-corréler les signaux d'entrée et de sortie
CN102149038A (zh) * 2009-09-14 2011-08-10 Gn瑞声达A/S 一种带有用于对输入和输出信号去相关的装置的助听器
US8345902B2 (en) 2009-09-14 2013-01-01 Gn Resound A/S Hearing aid with means for decorrelating input and output signals
CN102149038B (zh) * 2009-09-14 2014-01-15 Gn瑞声达A/S 一种带有用于对输入和输出信号去相关的装置的助听器
US10524062B2 (en) 2009-09-14 2019-12-31 Gn Hearing A/S Hearing aid with means for adaptive feedback compensation

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US8571243B2 (en) 2013-10-29
DK1853089T3 (da) 2009-11-16
EP1853089B2 (fr) 2013-09-25
EP1853089B1 (fr) 2009-07-29
US20070269068A1 (en) 2007-11-22
EP1853089A3 (fr) 2007-12-26
ATE438267T1 (de) 2009-08-15
DE102006020832A1 (de) 2007-11-15
DE102006020832B4 (de) 2016-10-27
DK1853089T4 (da) 2014-01-06

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