EP3576433A1 - Procédé de réduction de la présence d'une rétroaction acoustique dans un appareil auditif - Google Patents

Procédé de réduction de la présence d'une rétroaction acoustique dans un appareil auditif Download PDF

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Publication number
EP3576433A1
EP3576433A1 EP19174570.2A EP19174570A EP3576433A1 EP 3576433 A1 EP3576433 A1 EP 3576433A1 EP 19174570 A EP19174570 A EP 19174570A EP 3576433 A1 EP3576433 A1 EP 3576433A1
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EP
European Patent Office
Prior art keywords
hearing aid
situation
frequency
criticality
feedback
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Granted
Application number
EP19174570.2A
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German (de)
English (en)
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EP3576433B1 (fr
Inventor
Stefan Aschoff
Stefan Petrausch
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Sivantos Pte Ltd
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Sivantos Pte Ltd
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Publication of EP3576433A1 publication Critical patent/EP3576433A1/fr
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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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17819—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the reference signals, e.g. to prevent howling
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L21/0232—Processing in the frequency domain
    • 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
    • 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
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/41—Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation
    • 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
    • H04R25/30—Monitoring or testing of hearing aids, e.g. functioning, settings, battery power
    • H04R25/305—Self-monitoring or self-testing

Definitions

  • the invention relates to a method for reducing the occurrence of acoustic feedback in a hearing aid, wherein a first wearing situation is established, which defines a positioning of the hearing aid relative to the wearer, wherein for the first wearing situation, a first usage situation is established, and wherein a default for a Adjusting at least one hearing aid parameter takes place.
  • the occurrence of acoustic feedbacks presents a particular problem.
  • the sound generated by an output transducer of the hearing aid which is intended for the hearing of the wearer of the hearing aid, propagates in part to an input transducer of the hearing aid, and thereby passes again into the Signal processing of the hearing aid, in which a gain is applied to the signal of the input transducer.
  • the attenuation factor by which the sound of the output transducer is attenuated on the sound path to the input transducer is less than the amplification factor of the signal processing, the system may become unstable as a result of the closed amplification loop. This is audible as a whistling sound at the respective frequencies, and therefore leads to a significant impairment of the hearing of the wearer.
  • One of the common measures for suppressing such acoustic feedback is to reduce the signal processing gain when the feedback is registered.
  • the reduction of the gain can be limited to those frequency ranges in which the feedback occurs.
  • this has the disadvantage that the amplification of the signal processing is no longer selected exclusively as a function of the individual hearing impairment of the wearer, so that an output sound signal generated by the output transducer is no longer optimally tuned to the audiological needs of the wearer.
  • the occurrence of acoustic feedback is to a considerable extent tied to the specific situation of use.
  • the acoustic feedback path may change with changes such as making a phone call or putting on a headgear be changed, that the attenuation is reduced, and thus it comes to a critical feedback loop.
  • a spontaneous occurrence of feedback often leads in the described measures for suppression to a perceived as unpleasant whistling.
  • the invention has for its object to provide a method by which a spontaneous occurrence of feedback in certain situations is reduced, which should have the least possible impact on the generated according to the individual hearing impairment of the wearer of the hearing aid based on the input signals.
  • a method for reducing the occurrence of acoustic feedback in a hearing aid wherein a first wearing situation is established, which defines a positioning of the hearing aid relative to the carrier, wherein for the first wearing situation, a first use situation is produced by at least one body movement the wearer of the hearing device and / or at least one relative position of an external object to the body of the wearer is characterized, and wherein a first number of frequency-resolved curves of a feedback tendency of the hearing aid is determined for the first use situation.
  • a first criterion of criticality is determined from the or each frequency-resolved curve for the first use situation, which contains information about a frequency range critical with respect to an occurrence of an acoustic feedback and a corresponding relative probability for occurrence of an acoustic feedback, and with reference to the first Criticalticianshuses a default for adjusting at least one hearing aid parameter takes place.
  • a wearing situation here is to be understood in particular as the entirety of the circumstances under which the hearing aid is fixed locally on the wearer, and in particular an optionally present, exchangeable acoustic coupling piece (such as an ear mold piece or a so-called "dome") assumes a specific position ,
  • two carrying situations may differ with respect to the exact spatial position of the hearing device and / or the acoustic coupling piece, or may be given by the use of different acoustic coupling pieces.
  • a use situation here and hereinafter includes in particular that the wearer of the hearing device performs body movements during operation, in particular in a given carrying situation, or moves himself relative to limiting objects such as walls or windows, so that the movements taking place in the use situation are particularly suitable are to influence an acoustic Studcckopplungspfad the hearing aid.
  • a feedback tendency of the hearing aid includes, in particular, a frequency-dependent parameter, by means of which a quantitative probability for an occurrence of acoustic feedback at the relevant frequency can be determined.
  • a feedback tendency may be given by a ratio or a difference of an attenuation of the acoustic Feedback path and a gain by a hearing aid in the signal processing.
  • a frequency-resolved curve of a feedback slope may be given by the respective values of the feedback slope over the corresponding frequency spectrum, or by the values of the feedback slope at a plurality of nodes for the frequency to be selected, which are to be selected in a sufficiently high frequency resolution.
  • such a curve in particular such a curve can be chosen as the first criterion of criticality for which the amplification of the signal processing in the hearing device is greatest in frequency bands compared with the attenuation by the acoustic feedback path.
  • Such a curve can be created in particular from the maximum values over the individual curves at each frequency.
  • the first criterion of criticality may also be determined by weighting the values of the various curves at a given frequency.
  • the risk of feedback occurring at the corresponding frequency for the first usage situation may be inferred.
  • the relative probability of a Such an occurrence of the feedback can in this case also be related to other frequency ranges, ie the first criterion of criticality in particular to the effect that a feedback for a first frequency is then more probable than for a second frequency if the value of the first criterion of criticality at the first frequency is greater than the value at the second frequency.
  • the at least one hearing aid parameter is adjusted in accordance with the specification made on the basis of the first criterion of criticality, wherein the adaptation can be effected in particular automatically.
  • the adjustment according to the specification can also be followed manually by a hearing care professional.
  • the at least one hearing aid parameter is preferably adjusted under the additional specification to impair as little as possible a signal amplification and a playback dynamics in the hearing aid. This can be done, in particular, by adapting the at least one hearing aid parameter only for that frequency range for which, based on the first criterion of criticality, an occurrence of a feedback in the first use situation is considered to be sufficiently probable.
  • the evaluation can be carried out by a threshold value comparison of the frequency-resolved first criterion of criticality over the entire spectrum.
  • the probability of an occurrence of feedback can thus be limited purposefully to those frequency ranges in which a change of the present hearing aid parameters to avoid feedback is even necessary, whereby the adaptation with regard to the reproduction properties of the hearing aid "minimally invasive" can be configured.
  • Previous methods of reducing or suppressing feedback based on adaptation of hearing aid parameters typically check the occurrence of feedbacks frequency band wise.
  • the adaptation of the hearing aid parameters for the signals involved takes place with the least possible time delay for their verification, since it takes place during the ongoing operation of the hearing aid.
  • the hearing aid parameters are set frequency-bandwise at the level of the adaptation, whereby the reproduction for the entire frequency band is affected, for example, with a reduction of a gain in a frequency band, while possibly only for a narrow frequency interval within this frequency band, a critical probability for occurrence of a Feedback exists, and thus an adjustment of the gain would be sufficient only over this interval.
  • a plurality of frequency-resolved feedback slope curves are determined, wherein at a given frequency, the first criticality measure for the first user situation is formed based on a measure of the spread of the plurality of frequency resolved waveforms of the feedback slope at that frequency.
  • the first use situation is continuously maintained, for example by maintaining and / or repeating a corresponding body movement. Concretely, this can be done in such a way that the body movement, by which the first usage situation is characterized, is repeated several times, and a plurality of curves of the feedback tendency are thereby determined.
  • the scattering measure eg the variance of the values which the different curves for the feedback slope have at this frequency, is calculated, and the first criterion of criticality is formed on the basis of the determined variances for different frequencies.
  • the at least one hearing aid parameter may be adjusted even if, for a given frequency, none of the determined values for the feedback slope are immediately critical to feedback.
  • the degree of scattering of the values of the feedback slope can be considered as an indicator of the stability of the feedback path in the first use situation.
  • an attenuation of an acoustic feedback path is measured, wherein the feedback tendency to a given frequency is determined in each case on the basis of a signal amplification in the hearing aid and on the basis of the attenuation of the acoustic feedback path.
  • the feedback slope is determined as a sum or product of the attenuation of the acoustic feedback path and the signal gain in the hearing aid.
  • the attenuation of the acoustic feedback path can in this case be determined in particular by means of an adaptive filter, or be measured directly by means of a modulated test signal.
  • the first situation of use is established by the wearing of a headgear by the wearer, and / or a jaw movement of the wearer, and / or the use of a mobile telephone in the vicinity of the hearing aid by the wearer, and / or a sporty one Actuation of the carrier, and / or positioning of the carrier in the immediate vicinity of a spatial boundary.
  • a hat, a cap, and a headscarf are included as a headgear.
  • the jaw movement may consist of chewing or speaking.
  • Under a spatial boundary here in particular a window and a wall are included. The positioning is not bound to the movement process, but it can be turned off especially on a purely static situation in the vicinity of the boundary.
  • a cumulative existence of said conditions is possible, for example, by having a head covering sold off for an incipient telephone conversation.
  • the possibilities mentioned for the first situation of use cover a broad spectrum of situations which can occur in everyday life and in which an acoustic feedback path can in principle change.
  • the at least one hearing aid parameter is selected from a total gain at a frequency, and / or a compression characteristic at a frequency, and / or a readjustment speed.
  • the compression characteristic at a frequency is defined here in particular by a compression ratio and a knee point.
  • the total gain at a frequency may also include an immediately surrounding frequency interval. If the first criterion of criticality is determined essentially continuously over the frequency, then critical frequencies usually do not arise in isolation with respect to a probability for acoustic feedback - since at such a frequency the first criterion of criticality would have to assume its critical value exactly as the point of contact - but over an interval of frequencies.
  • a second usage situation is preferably produced for the first wearing situation, wherein a second criterion of criticality is determined for the second usage situation, wherein a specification for adjusting the at least one hearing aid parameter and / or a further hearing aid parameter takes place on the basis of the second criterion.
  • the second criterion of criticality for the second usage situation is determined in an analogous manner as the first criterion of criticality for the first usage situation. This makes it possible to individually evaluate the probability of an occurrence of feedback for different processes, and to specify the adaptation of one or more hearing device parameters depending on the totality of the evaluations.
  • the second use situation is particularly preferably produced by one of the operations mentioned for the first use situation.
  • the at least one hearing aid parameter is adjusted according to the specification made on the basis of the first criterion of criticality, wherein the hearing aid is operated with the adapted hearing aid parameter in a test operation, wherein the first use situation is established in test operation, and wherein for the first use situation in test operation a third criterion of criticality for, in particular, automatic verification of the adaptation is determined.
  • the third criterion of criticality is preferably determined in the manner described above, that is to say in a manner analogous to the first criterion of criticality, thereby ensuring comparability of the values at a given frequency.
  • the test operation can also consist in a resumption of the regular operation of the hearing aid, wherein first said by means of the third Comploiss damageses said review of the adjusted based on the first criterion of criticality Hörtechnikparameters, and the regular operation in the case of a positive review of the review is simply continued, and Case of a negative review of the review further action will be proposed.
  • the test operation can also be done by an independent routine be formed. In this case, the first situation of use is established in the context of the said routine, and by means of the third criterion of criticality the present setting of the hearing aid is checked, which comprises the adaptation of the at least one hearing aid parameter made on the basis of the first criterion of criticality.
  • a second wearing situation is established, wherein the first use situation is established for the second wearing situation, wherein a fourth criticality measure is determined for the first use situation in the second wearing situation, and wherein with reference to the fourth criterion of criticality a specification with respect to a suitability of the second carrying situation for the operation of the hearing aid takes place.
  • the fourth criterion of criticality is preferably determined in the manner described above, that is to say in a manner analogous to the first measure of criticality and particularly preferably also to the third criterion of criticality, thereby making it possible to compare the values of the first measure of criticality and at least the fourth measure of criticality, particularly preferably of the third criterion of criticality at a given frequency is ensured.
  • the production of a second carrying situation can be advantageous, in particular, if the probability of the occurrence of a feedback in the first use situation can not be significantly reduced by adapting the hearing device parameters, and this is determined in particular by checking the adaptation by means of the third criterion of criticality.
  • a specification can be made for changing the at least one hearing aid parameter, and this can be adapted accordingly under the secondary conditions which result from the requirement for the reproduction dynamics and volume for the wearer.
  • the first usage situation is established in the test mode, and the third criticality measure for the adjusted settings is determined here. If now it is found that feedback is still critically probable even after a successful adaptation of the settings, preferably within the audiologically acceptable framework, this is considered to be an indication of an im the broadest sense of the mechanical problem, which can therefore be remedied by changing the wearing situation.
  • the second carrying situation is produced by a position correction of an acoustic coupling piece of the hearing aid, and / or a use of an acoustic coupling piece with changed dimensions, and / or a use of an acoustic coupling piece with a modified ventilation opening.
  • an ear coupling, a so-called “dome” and a so-called “ear mold” are in particular included under an acoustic coupling piece.
  • acoustic feedbacks through the use of another acoustic coupling piece are particularly efficient in correcting that these can usually be replaced simply and without great expertise - that is to say, the measures mentioned are frequently sources of error when the hearing device is put into its regular carrying position by the wearer himself or a trusted person, without requiring a visit to a hearing care professional - and no further, more complex interventions on the hearing aid are required.
  • the first wearing situation is produced in particular by a simple application of the hearing aid - according to the present mechanical configuration - in the supposed wearing position.
  • At least the first carrying situation and the first use situation are detected by means of a video recording system.
  • a video recording system can in particular make it possible for visiting a specialist, eg a hearing aid acoustician, to avoid having to reduce the probability of feedback, which proves to be comfortable for the wearer.
  • image data generated by the video recording system are transmitted to and reproduced by a video playback system spatially separated from the carrier, and / or an automatic command for determining the number of frequency-resolved curves of a feedback tendency of the video data system generated by the video recording system Hearing aid is generated in the first use situation.
  • the automatic command can be generated in particular on the basis of a face or generally an image recognition, which determines the correct production of the first use situation, e.g. by detecting a chewing or speaking movement of the jaw or the introduction of a mobile phone to the ear by the wearer.
  • the video display system may be located at a hearing care professional in its work spaces while the wearer is at home in the detection area of the video recording system.
  • the wearer produces the first usage situation in the first wearing situation, eg by putting on a headgear or by guiding a mobile phone to his ear.
  • the first use situation can now be terminated on the one hand by the expiration of a fixed period of time, or on the other hand be terminated if the determined curves for the feedback tendency no longer exceed their own extreme values or envelopes for a certain measurement period.
  • the first criticality measure is then determined from the determined curves of the feedback tendency.
  • the adaptation itself can be done either by the wearer himself, by a trusted person of the wearer (in particular, if this even unable to do this) or via a suitable remote access by the hearing care professional.
  • the first use situation in the test mode can now be produced again on a further start signal, and further curves of the feedback tendency can be determined, from which the third criterion of criticality is then determined.
  • the hearing aid acoustician can instruct the wearer to produce the second wearing situation, where appropriate the concrete selection of the measure based on the third and possibly also on the basis of the first criterion of criticality - e.g. About characteristic for certain errors gradients -wird and can be specified in particular automatically.
  • a measure is specified which the wearer can not perform independently, his trusted person can, under the direction of the hearing aid acoustician, establish the second wearing situation via the video surveillance system.
  • the first usage situation is established in response to a start signal, and a renewed series of measurements of the feedback tendency for determining the fourth criterion of criticality is carried out, on the basis of which the suitability of the second carrying situation for suppressing the feedback is evaluated.
  • the invention further mentions a hearing device which is set up to carry out the method described above.
  • the hearing device has means for detecting at least the attenuation of an acoustic feedback from an output transducer of the hearing aid to an input transducer.
  • the hearing device preferably also has means for transmitting a signal amplification as well as the attenuation due to the acoustic feedback to an external detection unit.
  • parts of the above-described method such as determining the first and further criticality measures and the corresponding presets in the external detection unit, can take place.
  • the hearing device preferably comprises means for calculating the first and further criticality measures.
  • FIG. 1 is shown schematically in a block diagram of a hearing aid 1.
  • An input transducer 2 of the hearing aid 1 which is configured here as a microphone, converts a sound signal 4 of the environment into an input signal 6.
  • the input signal 6 is supplied in the hearing aid 1 a signal processing 8 and processed there according to the audiological needs of the wearer of the hearing aid 1 and in this case in particular amplified frequency band dependent.
  • the resulting from the signal processing 8 output signal 10 is converted by an output transducer 12 of the hearing aid 1 into an output sound signal 14, which is performed to the hearing of the wearer of the hearing aid 1, not shown.
  • the output transducer 14 is presently given by a loudspeaker, which is arranged in an acoustic coupling piece 15 of the hearing device 1.
  • the acoustic coupling piece is given here as an earmold.
  • a portion of the output sound signal 14 can now go again to the input converter 2, and thus find input into the input signal 6, whereby a closed feedback loop is formed, in which signal components are amplified by the signal processing 8 more and more.
  • the amplification can now be reduced on the one hand in the signal processing 8.
  • this is associated with a loss of gain also for other signal components not affected by the acoustic feedback, so that the signal processing 8 no longer operates optimally in accordance with the audiological specifications of the wearer of the hearing aid 1.
  • the output signal 10 is often branched off and fed to an adaptive filter 18. This generates a compensation signal 20, which is supplied to the input signal 6 and subtracted from this.
  • the signal resulting from this subtraction is input into the signal processing 8, and on the other hand is also supplied to the adaptive filter as an error signal 22.
  • the acoustic feedback path 16 or its frequency response is estimated in the adaptive filter 18.
  • the rate at which the estimate of the feedback path is updated forms as a variable time parameter of the adaptive filter 18.
  • This time parameter is set, the faster the suppression of feedback adapts to a change in the acoustic feedback path.
  • the quicker readjustment by the user can all the more frequently be perceived as a disturbing artifact.
  • a trade-off should be chosen here for a pleasant sense of sound, preferably without feedback.
  • an acoustic feedback sometimes also predominantly mechanical causes, such as a non-optimal fit of the acoustic coupling piece 15 of the hearing aid 1 in the ear of the wearer, whereby a particularly high proportion of the output sound signal 14 escape and can get back to the input transducer 2.
  • Other causes which may be described as mechanical, may depend on a specific situation of use such as, for example, a chewing or speaking movement or the influence of the acoustic feedback path 16 by a mobile telephone or other similar object in the vicinity of the hearing aid 1.
  • the suppression of the feedback by the adaptive filter 18 is not always expedient under the risk of artifacts in the output signal 10.
  • FIG. 2 shown in a block diagram, which has a corresponding method to the subject.
  • a first carrying situation 30 is produced, in which the wearer after the hearing aid 1 FIG. 1 regular.
  • the first wearing situation 30 is characterized in particular by the global position of the hearing aid 1 to the wearer, and also by the use of individual, reversibly exchangeable components such as the acoustic coupling piece 15 and their positioning relative to the carrier.
  • a first use situation 32 is now produced, which is characterized by at least one body movement of the carrier and / or by an external object.
  • a plurality of frequency-resolved waveforms 34a-c of a feedback slope of the hearing aid are determined. This is done by, for example, by repeating the movement, which of the first usage situations the measurement process is repeated for the feedback slope, and over time a plurality of "screenshots" of the feedback slope over the frequency is generated. From the frequency-resolved curves 34a-c of the feedback tendency, a first criticality measure 36 is generated in a manner to be described, on the basis of which a default 38 is made for adapting at least one hearing device parameter.
  • a second usage situation can also be established in the first carrying situation 30, in which frequency-resolved curves of a feedback tendency of the hearing aid 1 are also detected FIG. 1 are determined from which a second criterion of criticality is determined.
  • the second criterion of criticality determined in this way, it is then also possible to specify one or more hearing aid parameters, wherein the specification can relate to the hearing aid parameter or parameters for which a specification 38 is already made on the basis of the first criterion of criticality 36.
  • the prescription prepared on the basis of the second criterion of criticality may also relate to other hearing aid parameters for which no prescription exists yet.
  • the hearing aid parameter 40 can be, for example, an overall gain at a specific frequency, and / or a compression characteristic at a specific frequency, but also a parameter of the adaptive filter 18 FIG. 1 , For example, a Nachregelungs horrinus or a step size.
  • a test operation 42 is recorded, in which the hearing aid 1 is tested in the first use situation 32.
  • frequency-resolved curves 44a-c are determined for the feedback tendency of the hearing aid.
  • the frequency-resolved curves 44a-c are therefore generated while the movement corresponding to the first usage situation is repeated in the test mode 42.
  • a third criterion of criticality 46 is generated analogously to the first criterion of criticality 36. Based on the third Critik Rundschs damageses 46 can now it is determined whether the adaptation of the hearing aid parameter 40 according to the specification 38 has significantly reduced the probability of an occurrence of an acoustic feedback during the first use situation 32.
  • a second carrying situation 50 is proposed. This may be, for example, a position correction of the acoustic coupling piece 15 of the hearing aid 1, or a use of an acoustic coupling piece with changed dimensions and / or a modified ventilation openings.
  • the corresponding measure which characterizes the second carrying situation 50
  • the wearer of the hearing device 1 or a person of trust produces the second wearing situation.
  • the first usage situation is again produced by the corresponding movement.
  • frequency-resolved curves 54a-c for the feedback slope are determined, on the basis of which a fourth criticality measure 56 is determined.
  • the second carrying situation 50 can be identified as a carrying situation to be used from now on, for example by continuing to use an optionally exchanged acoustic coupling piece, or by continuously ensuring that it fits properly in the case of the application of the acoustic coupling piece Auditory canal penetrates.
  • a third carrying situation (not shown in detail) can be produced analogously to the second carrying situation 50, or the search for a hearing aid acoustician can be recommended as a "last resource" measure.
  • a feedback slope 60 in dB versus frequency f is plotted.
  • the feedback slope 60 which is a measure of a probability of occurrence of acoustic feedback, is formed here by the damping 62 of the acoustic feedback path 16 after FIG. 1 (dashed line) which takes place in the signal processing 8 gain 64 (dash-dotted line) is added.
  • a plurality of frequency-resolved curves 60a-m for the feedback tendency are shown. These correspond, for example, different individual measurements, which during the first use situation after FIG. 2 be performed. While in the frequency range up to about 3 kHz the individual curves 60a-m barely differ from each other, and thus the variance of the different curve values at a given frequency is hardly noticeable, the curves 60a-m drift apart noticeably from 3 kHz upwards. In particular, a narrow frequency range around 6 kHz should be mentioned, in which the individual curves differ in their values by up to 30 dB. From 7 kHz upwards, the course of the curves is almost uniform again.
  • a criticality measure 66 is now determined analogously to the first criterion of criticality 36, the third criterion of criticality 64, and the fourth criterion of criticality 56. This is done by adding at each frequency f to the maximum value 60m for the feedback slope (dotted line) a correction term that is monotonically dependent on the variance of the individual values of the curves 60a-m for a given frequency f. Thus, for the high variance, which is just below 6 kHz, the criticality measure 66 (dashed line) is maximal.
  • the criticality measure 66 is larger there than at 2 kHz due to the higher variance at 4 kHz. This takes into account the fact that over the entire range of possible values during the first use situation at 2 kHz a higher stability of the system is present than at 4 kHz, therefore it can be assumed that at 4 kHz the maximum value determined is not necessarily the absolute possible Maximum value, while this is probably the case because of the high stability at 2 kHz. Accordingly, the criticality measure is higher at 4 kHz.

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Otolaryngology (AREA)
  • Neurosurgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP19174570.2A 2018-05-30 2019-05-15 Procédé de réduction de la présence d'une rétroaction acoustique dans un appareil auditif Active EP3576433B1 (fr)

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DE102018208657.5A DE102018208657B3 (de) 2018-05-30 2018-05-30 Verfahren zur Verringerung eines Auftretens einer akustischen Rückkopplung in einem Hörgerät

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EP (1) EP3576433B1 (fr)
CN (1) CN110557708B (fr)
DE (1) DE102018208657B3 (fr)
DK (1) DK3576433T3 (fr)

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US10681458B2 (en) * 2018-06-11 2020-06-09 Cirrus Logic, Inc. Techniques for howling detection
EP4021017A1 (fr) * 2020-12-28 2022-06-29 Oticon A/s Prothèse auditive comprenant un système de commande de rétroaction

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DK2217007T3 (da) * 2009-02-06 2014-08-18 Oticon As Høreapparat med adaptiv tilbagekoblingsundertrykkelse
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EP2869600A1 (fr) * 2013-11-05 2015-05-06 GN Resound A/S Suppression adaptative de rétroaction résiduelle
EP2908549A1 (fr) * 2014-02-13 2015-08-19 Oticon A/s Dispositif de prothèse auditive comprenant un élément de capteur

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US10873817B2 (en) 2020-12-22
US20190373379A1 (en) 2019-12-05
DE102018208657B3 (de) 2019-09-26
CN110557708A (zh) 2019-12-10
CN110557708B (zh) 2021-10-22
EP3576433B1 (fr) 2021-08-11
DK3576433T3 (da) 2021-11-08

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