EP3068146B1 - Method for operating a hearing device and hearing device - Google Patents

Method for operating a hearing device and hearing device Download PDF

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Publication number
EP3068146B1
EP3068146B1 EP16158247.3A EP16158247A EP3068146B1 EP 3068146 B1 EP3068146 B1 EP 3068146B1 EP 16158247 A EP16158247 A EP 16158247A EP 3068146 B1 EP3068146 B1 EP 3068146B1
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EP
European Patent Office
Prior art keywords
noise
gain factor
intensity
ovd
parameter
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EP16158247.3A
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German (de)
French (fr)
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EP3068146A1 (en
Inventor
Homayoun KAMKAR-PARSI
Marko Lugger
Tobias Daniel Rosenkranz
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Sivantos Pte Ltd
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Sivantos Pte Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/30Monitoring or testing of hearing aids, e.g. functioning, settings, battery power
    • H04R25/305Self-monitoring or self-testing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/43Electronic input selection or mixing based on input signal analysis, e.g. mixing or selection between microphone and telecoil or between microphones with different directivity characteristics
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/35Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/35Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/353Frequency, e.g. frequency shift or compression
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/35Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/356Amplitude, e.g. amplitude shift or compression
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/48Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using constructional means for obtaining a desired frequency response
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/41Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/43Signal processing in hearing aids to enhance the speech intelligibility

Definitions

  • the invention relates to a method for operating a hearing device and a hearing aid suitable for this purpose.
  • a hearing aid is typically used by a user to improve their hearing.
  • the hearing device comprises at least one microphone for recording noises in the environment of the user, which are then amplified in the hearing aid by means of an amplifier and output via a receiver.
  • Different configurations are possible for the hearing aid, which are then carried in different ways by the user: for example, a CIC device is completely worn in the ear, in a RIC device, only the earpiece is worn in the ear and the other components in a common housing behind the ear and a BtE device all components are arranged in a common housing, wherein the sounds emitted by the listener are often passed through a sound tube or the like to the ear.
  • the gain of an input signal generated by the microphone is essentially determined by an amplification factor set in the amplifier.
  • an amplification factor set in the amplifier.
  • the amplification performed by the hearing aid changes when its own voice is detected.
  • the EP 1 744 589 A2 For example, a hearing apparatus and a method for self-detection are described.
  • the activity of one's own voice is permanently captured and included in the control of algorithms of the hearing device, thereby avoiding artifacts and false control triggered by one's own voice.
  • an automatic gain control of the hearing aid is frozen.
  • WO 2014/075195 discloses a hearing aid in which an automatic gain adjustment depends on the detection of the user's own voice and in addition on the ambient noise.
  • the disadvantages which result from a dynamic adaptation of the amplification factor as a function of the user's voice should at least be reduced and avoided as far as possible.
  • a suitable hearing aid should be specified.
  • the hearing aid is worn by a user and includes at least one microphone for receiving sounds from the environment of the user, an amplifier and a handset, to output amplified sounds.
  • an input signal is generated by the microphone, which is amplified in the amplifier with an adjustable gain factor.
  • the amplification factor can be adjusted manually by means of a control element on a housing of the hearing device or by means of a remote control by the user in the sense of a volume control.
  • the hearing aid further includes an OVD unit, where OVD stands for own voice detection.
  • OVD stands for own voice detection.
  • an OVD parameter is determined which indicates whether the user speaks for himself or not. In this way, an inherent voice recognition is realized in particular.
  • the OVD parameter is a first parameter here.
  • the OVD parameter is realized as a Boolean parameter, which is true if the user speaks for himself and otherwise is false.
  • a continuous OVD parameter is conceivable.
  • a suitable OVD unit is in particular in the above-mentioned, subsequently filed application with the file reference DE 10 2014 217 172.5 , described.
  • the amplification factor is set within a certain value range as a function of the OVD parameter, whereby a dynamic gain adaptation is realized in eigen providedsituationen.
  • Characteristic of an eigen providedsituation are in particular temporally alternating phases of speaking and silence of the user, ie this leads, for example, a conversation with another person.
  • the gain of the input signal then takes place depending on whether the user speaks or not.
  • the gain factor is reduced in a situation in which the user speaks, compared to a situation in which the user does not speak.
  • the amplification factor is additionally set as a function of a noise which is not the user's own voice, but rather a particular external noise, for example a fan or engine noise or generally a background noise.
  • a noise which is not the user's own voice, but rather a particular external noise, for example a fan or engine noise or generally a background noise.
  • a detection or an estimate of the noise occurs. It is therefore first determined whether a noise is present.
  • the noise is in particular a stationary noise, which does not change at all or only to a small extent over a longer period of time.
  • stationary is understood to mean that the noise has an acoustic frequency spectrum with an average level which does not change by more than 3 to 6 dB over a period of about 1 to 10 s. In other words, the statistical properties of the frequency spectrum of the noise remain essentially constant over a certain period of time.
  • an environmental noise at a substantially constant volume level i.e., an ambient noise level.
  • a stationary noise or interference signal so this is correspondingly times more and sometimes less amplified.
  • stationary noise are fan and engine noise in a vehicle. Due to the temporally varying amplification of the stationary ambient noise due to a constantly adjusted amplification factor as a function of the user's speech activity, this results in a perceived as unpleasant modulation of ambient noise. If no noise is present, especially no stationary noise, i. if no noise is detected, in particular a conventional gain adjustment is made as a function of the OVD parameter.
  • An essential advantage of the invention is now in particular that an unpleasant modulation of a stationary noise due to one of the own voice of the User-dependent dynamic gain adjustment is prevented, in particular by advantageously reducing the value range of the dynamic gain adjustment.
  • the additional adjustment as a function of a noise prevents its unpleasant modulation, in particular in that the modulation of the amplification factor due to the OVD unit is suitably reduced.
  • the amplified input signal, ie the output signal of the hearing aid has a modulation depth which is adjusted as a function of the noise, ie in particular reduced.
  • a hearing aid operated in this way offers significantly improved hearing comfort, in particular since the user's own voice is reproduced correctly and at the same time a modulation of otherwise stationary noise is avoided or at least reduced to an acceptable level.
  • the amplification factor is set not only independently of each other on the one hand as a function of the OVD parameter and, on the other hand, as a function of the noise. Rather, these two dependencies also affect each other, i. E. the setting of the gain as a function of the OVD parameter is itself dependent on the presence and / or the properties of a noise. Depending on what kind of noise situation is present, another dynamic gain adjustment based on the OVD parameter makes sense.
  • the adjustment of the amplification factor as a function of the noise thus altogether aims to modify that setting of the amplification factor which takes place as a function of the OVD parameter, namely as a function of the noise. This is done, for example, by setting the value range of the dynamic gain adjustment depending on the noise, ie by a direct intervention in the dynamic gain adjustment.
  • the amplification factor is additionally set in order to counteract the adjustment as a function of the OVD parameter, ie by superimposing the dynamic gain adjustment in order to modify it in the end result.
  • modify is generally understood that ultimately an adjustment, compensation or change takes place. In the present case, a modification of the gain adjustment by an additional adjustment in response to a noise occurs.
  • the gain adjustment due to the OVD unit is optimally modified as a function of the noise.
  • the gain is reduced if the user speaks for himself, and increased if the user does not speak himself.
  • the amplification factor for example, at a speech activity of the user is not reduced or less, compared to a hearing aid without such additional adjustment in response to a stationary noise.
  • a modulation of the noise when changing the user's speech activity is then reduced accordingly or avoided altogether and it results in a more pleasant and more natural reproduction of ambient noise for the user.
  • an intensity of the noise is determined by means of a noise estimator, also referred to as a noise estimator, and the amplification factor adjusted depending on the intensity.
  • the intensity is a second parameter which is used in addition to the OVD parameter for setting the amplification factor.
  • the user's own speech activity at a higher detected intensity, i. with a louder noise, set a larger gain than with a lower intensity, i. a lesser noise, and at a lower detected intensity a lower gain than at a higher intensity.
  • This advantageously reduces the difference between the amplification factor set during phases of one's own speech activity and the amplification factor set during phases of inherent inactivity when changing the amplification factor as a function of the OVD parameter.
  • Under his own speech activity is understood in particular that the user speaks himself, while this does not speak itself in own inactivity.
  • the described measure is based on the finding that the modulation of a noise with a lower volume, ie lower intensity is perceived as less disturbing than the modulation of a noise with higher intensity in comparison. Therefore, in an inherent voice situation with a loud noise, advantageously, the gain factor from the self-inactivity gain factor is less reduced than with a quieter noise, so that in particular the modulation of the noise due to the OVD unit switchover is advantageously reduced with noisy noise.
  • the gain factor from the self-inactivity gain factor is less reduced than with a quieter noise, so that in particular the modulation of the noise due to the OVD unit switchover is advantageously reduced with noisy noise.
  • the gain factor from the self-inactivity gain factor is less reduced than with a quieter noise, so that in particular the modulation of the noise due to the OVD unit switchover is advantageously reduced with noisy noise.
  • the gain factor from the self-inactivity gain factor is less reduced than with a quieter noise, so that in particular the modulation of the noise due to the OVD
  • the first intensity is about 50 dB and the second intensity is greater and about 80 dB, then a lower gain factor is set in the case of the first intensity than in the case of the second intensity, both gain factors being smaller than the gain factor which is set if the user does not speak himself. A louder noise is then less modulated compared to a quieter noise.
  • the change in the gain produced by the OVD unit is preferably reduced, thereby setting a higher gain factor at times of own speech activity.
  • the change in the amplification factor is correspondingly increased so that a lower amplification factor is set at times of one's own speech activity.
  • the setting of the amplification factor at times own speech activity is proportional to the determined intensity or alternatively under or disproportionately.
  • the noise estimator determines the intensity, ie the volume or the volume level of the noise, in particular from the input signal.
  • a method, in particular algorithm is used which takes into account only stationary portions of a noise.
  • the advantage in this case is, in particular, that such a method can be used in principle only to determine stationary noise and non-stationary noise can not be detected.
  • the gain factor will then be set substantially dependent on the OVD parameter. Only in the presence of a stationary signal, the gain is additionally adjusted depending on this only stationary noise. On the other hand, in the case of only modulated noise, an optimal OVD functionality of the hearing aid is thus ensured.
  • a particularly suitable method is a so-called minimum-statistics method. Therefore, in a suitable variant, the intensity of the noise is determined by means of a minimum statistics method. The noise estimator is then designed to carry out such a minimum statistics method and determines the intensity, ie the volume level, in particular by means of a corresponding statistical evaluation of the input signal.
  • a possible embodiment of a minimum-statistics method is described, for example, in: Martin, R. (1994), "Spectral subtraction based on minimum statistics
  • a minimum-statistics method is particularly simple to implement and, in principle, can only be used to detect stationary noise, while non-stationary noise is essentially ignored, which in turn results in the advantages mentioned above.
  • the input signal is first of all subdivided into a multiplicity of successive time intervals, from which a frequency spectrum is determined in each case by means of a Fourier transformation, ie a spectrum in which a specific level is assigned to each frequency.
  • the noise estimator the intensity is then determined in particular by measuring the level in a number of frequency ranges of a respective frequency spectrum which corresponds in particular to the intensity of the noise in the corresponding frequency range.
  • a certain and in particular frequency-dependent minimum intensity for example a sound pressure level of about 50 dB
  • a steady-state noise with a higher intensity than the minimum intensity is determined, an additional adaptation of the amplification factor to avoid or at least reduce a possible modulation of the noise by the OVD unit takes place.
  • a stationarity of the noise is determined as a third parameter by means of a stationarity detector and the amplification factor is set as a function of the stationarity.
  • the determination of the stationarity is suitably carried out by means of a statistical examination of the input signal. Therefore, in a suitable embodiment, the stationarity is determined as an intensity stability, for example as a variance of the mean level or the level in a certain frequency range and over a certain period of time, ie in particular over several frequency spectra. For example, the variance of the level is determined at about 1 kHz over a period of about 1 s.
  • the stationarity is suitably determined as a frequency stability.
  • a level maximum is determined, in particular in the frequency spectrum of the input signal, and the variance of the frequency assigned to this level maximum is determined.
  • the stationarity is suitably determined as the ratio of the levels of stationary and non-stationary portions of the noise.
  • the respective levels are determined and set in relation to each other.
  • a stationarity threshold value it is expedient to carry out a defined demarcation between stationary and non-stationary noise by specifying a stationarity threshold value. If a stationarity is then determined which exceeds the stationarity threshold, then the noise is regarded as non-stationary and no additional adjustment of the amplification factor takes place. However, if the stationarity is below the stationarity threshold, a stationary noise is correspondingly detected and the amplification factor is set accordingly.
  • the parameters are each mapped to a scaling factor, for example in the range from 0 to 1, and the amplification factor is set by multiplication by the scaling factors.
  • the amplification of the input signal is performed with the amplification factor specified by the amplifier.
  • the gain factor is set in a particularly simple manner depending on the parameters, namely depending on the OVD parameter, i. from an OVD situation, stationarity, i. the presence of a stationary noise, as well as the intensity, i. the volume of the stationary noise.
  • the mapping takes place in particular in the sense of a so-called mapping, in which a value of the dimensionless interval 0 to 1 is assigned to a specific value of a parameter.
  • a limited value range of a respective parameter is mapped to the interval. For example, a picture of the intensity only for sound pressure level from a range of about 50 to 80 dB, wherein at a higher sound pressure level, ie higher intensity and while the user does not speak even higher amplification to take place and assigned according to an intensity of 80 dB, the scaling factor 0 and, with an intensity of 50 dB, a scaling factor of 1.
  • the assignment takes place, for example, linearly or logarithmically; outside is correspondingly constant 0 or 1 assigned.
  • the scaling factors are first combined into a total scaling factor, and the gain factor is then set by multiplying by the total scaling factor.
  • the combining takes place in particular by means of a multiplier, with the scaling values as input values and the total scaling factor as the output value. This then forms in particular the result of a scene analysis, which is performed by the hearing aid in terms of the user's speech activity and the presence of stationary noise.
  • the input signal is typically composed of different frequencies, which in particular form an acoustic frequency spectrum with a number of frequency ranges. Frequently, moreover, different frequencies or frequency ranges of the frequency spectrum are amplified differently, since, for example, a particular frequency range is given greater importance.
  • the gain factor is set frequency-dependent, in particular the scaling factors are frequency-dependent, i. each a function of frequency.
  • an independent adjustment of the amplification factor is carried out in different frequency ranges, also referred to as frequency bands, of the input signal.
  • different significant frequency ranges are independent of each other and subject to a correspondingly adapted dynamic gain adjustment as needed.
  • the hearing device has a control unit for carrying out the method.
  • This is suitably connected to the amplifier and comprises corresponding modules for adjusting the amplification factor.
  • the modules are in particular the OVD unit as well as the noise estimator and / or the stationarity detector.
  • an embodiment of the control unit as an application-specific integrated circuit, so-called ASIC, conceivable, wherein the modules are each realized as part of this circuit.
  • ASIC application-specific integrated circuit
  • a configuration as a programmable microcontroller is possible, in which the modules are partially or completely implemented as program modules.
  • the advantages of the invention are, in particular, that in addition to a dynamic adjustment of the amplification factor as a function of the speech activity of the user of the hearing aid, an extended dynamic adjustment is made taking into account stationary noise.
  • the intensity and / or stationarity is determined as characteristic parameters of a respective stationary noise and used to adapt the amplification factor.
  • the determined parameters are mapped to scaling factors.
  • a hearing aid 2 which here is a so-called RIC device and comprises a housing 4, which is supported by a user, not shown, behind the ear.
  • the hearing device 2 further comprises a number of microphones 6, a control unit 8, an amplifier 10 and a receiver 12. Furthermore, a battery 14 for the power supply is present.
  • an input signal E is generated which, during operation, is passed on to the amplifier 10 for amplification and amplified there with a specific amplification factor V.
  • the thus amplified input signal E is then output via the handset 12, more precisely via a loudspeaker of the handset 12, not shown here in detail.
  • the handset 12 is worn by the user directly in the ear and is connected via a suitable lead 16 to the amplifier 10.
  • the hearing device 2 it is also possible for the hearing device 2 to be a BTE device, in which the handset 12 is mounted in or on the housing 4 and the supply line 16 is designed as a sound tube.
  • the hearing aid 2 is a CIC device, which is worn completely in the ear.
  • the amplification factor V is adjustable by means of the control unit 8.
  • the amplification factor may also be adjustable in another way, not shown in more detail, for example manually by an operating element (not shown) on the hearing device 2.
  • the amplification factor V is set by the control unit 8 FIG. 2 by an overall scaling factor G provided by the control unit 8.
  • the conventionally used amplification factor V is multiplied by the overall scaling factor G in order to obtain a matched amplification factor V.
  • the overall amplification factor G is the result of an analysis of the input signal E carried out by the control unit 8.
  • the analysis essentially takes place with regard to the speech activity of the user and possible noises in the environment of the user.
  • the control unit 8 comprises several, here three modules 20, 22, 24, namely an OVD unit 20, a noise estimator 22 and a stationarity detector 24. These each generate a scaling factor S1, S2, S3 on the basis of characteristic parameters derived from the input signal E can be determined. These three scaling factors S1, S2, S3 are combined by means of a multiplier 26 to the total scaling factor G.
  • an OVD parameter is first determined by means of the OVD unit 20, which indicates whether the user speaks for himself, that is, whether the user's speech activity is present. If this is the case, the gain factor V should be reduced, otherwise increased.
  • the OVD parameter is mapped to the scaling factor S1 in a range between 0 and 1. For example, the mapping takes place in such a way that the scaling factor S1 is 0 in the case of the user's own speech activity and otherwise 1.
  • the gain V is then adjusted according to the situation such that either no gain or maximum gain occurs.
  • a gradation, z. B. due to the level, ie the volume of the user's voice.
  • a possibly recorded noise is analyzed, with respect to its intensity.
  • the determined intensity as a characteristic parameter of the noise indicates in particular its volume and is thus a measure of the volume of stationary background noise.
  • the intensity is now mapped to the scaling factor S2, that stationary noise when modulating the scaling factor S1 by the OVD unit 22 are modulated as little as possible, and the less, the louder the noise.
  • no or only a slight adjustment of the amplification factor V is made via the scaling factor S2 of the noise estimator 22.
  • the predetermined by the OVD unit 20 scaling factor S1 is counteracted.
  • the stationarity detector 24 additionally determines to what extent the noise is actually a stationary noise.
  • the input signal E is examined with respect to its temporal evolution, to determine a stationarity.
  • the intensity and frequency stability in one or more frequency ranges are statistically investigated and, for example, variances of specific levels or frequencies in the frequency spectrum of the input signal E are determined. These variances are then mapped to a scaling factor S3 to exert further influence on the gain factor V.
  • the amplification factor V is adjusted as a function of the overall acoustic situation around the user.
  • an adjustment is made as a function of the speech activity of the user by the OVD unit 20 and a setting in response to a stationary noise by the modules 22, 24. It is possible by means of the modules 22, 24, negative effects in adjusting the gain V through compensate or at least reduce the OVD unit.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Neurosurgery (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betrieb eines Hörgeräts sowie ein dafür geeignetes Hörgerät.The invention relates to a method for operating a hearing device and a hearing aid suitable for this purpose.

Ein Hörgerät wird typischerweise von einem Anwender verwendet, um dessen Hörfähigkeit zu verbessern. Dazu umfasst das Hörgerät zumindest ein Mikrofon, zur Aufnahme von Geräuschen in der Umgebung des Anwenders, welche dann im Hörgerät mittels eines Verstärkers verstärkt und über einen Hörer ausgegebenen werden. Dabei sind für das Hörgerät verschiedene Ausgestaltungen möglich, die dann auf unterschiedliche Weise vom Anwender getragen werden: beispielsweise wird ein CIC-Gerät komplett im Ohr getragen, bei einem RIC-Gerät wird lediglich der Hörer im Ohr getragen und die übrigen Komponenten in einem gemeinsamen Gehäuse hinter dem Ohr und bei einem BtE-Gerät sind sämtliche Komponenten in einem gemeinsamen Gehäuse angeordnet, wobei die vom Hörer ausgegebenen Geräusche häufig über einen Schallschlauch oder Ähnliches zum Ohr geleitet werden.A hearing aid is typically used by a user to improve their hearing. For this purpose, the hearing device comprises at least one microphone for recording noises in the environment of the user, which are then amplified in the hearing aid by means of an amplifier and output via a receiver. Different configurations are possible for the hearing aid, which are then carried in different ways by the user: for example, a CIC device is completely worn in the ear, in a RIC device, only the earpiece is worn in the ear and the other components in a common housing behind the ear and a BtE device all components are arranged in a common housing, wherein the sounds emitted by the listener are often passed through a sound tube or the like to the ear.

Die Verstärkung eines vom Mikrofon generierten Eingangssignals wird wesentlich durch einen im Verstärker eingestellten Verstärkungsfaktor bestimmt. Zur optimalen Verstärkung in unterschiedlichen Situationen ist es prinzipiell bekannt, den Verstärkungsfaktor je nach Situation automatisch geeignet einzustellen. Beispielsweise wird der Verstärkungsfaktor in solchen Situationen reduziert, in denen der Anwender des Hörgerätes selbst spricht, da ansonsten die Wiedergabe der eigenen Stimme häufig verzerrt wahrgenommen wird, was vom Anwender üblicherweise als unangenehm empfundenen wird.The gain of an input signal generated by the microphone is essentially determined by an amplification factor set in the amplifier. For optimum amplification in different situations, it is known in principle to adjust the gain automatically depending on the situation. For example, the amplification factor is reduced in those situations in which the user of the hearing aid speaks for himself, since otherwise the reproduction of his own voice is often perceived distorted, which is usually perceived as unpleasant by the user.

Eine solche Anpassung in Abhängigkeit der Sprechaktivität des Anwenders ist beispielsweise in der nachveröffentlichten und auf die Anmelderin zurückgehenden Anmeldung mit dem Aktenzeichen DE 10 2014 217 172.5 vom 28.8.2014 beschrieben. So wird in einer Ausgestaltung die vom Hörgerät durchgeführte Verstärkung verändert, wenn die eigene Stimme erkannt wird. In der EP 1 744 589 A2 werden eine Hörvorrichtung und ein Verfahren zur Eigenstimmendetektion beschrieben. Die Aktivität der eigenen Stimme wird permanent erfasst und in die Steuerung von Algorithmen der Hörvorrichtung einbezogen, wodurch Artefakte und Fehlsteuerungen vermieden werden, welche durch die eigene Stimme ausgelöst werden. Beispielsweise wird bei Präsenz der eigenen Stimme des Hörgeräteträgers eine automatische Verstärkungsregelung des Hörgeräts eingefroren. Durch ein dynamisches, d.h. situationsbedingtes Einstellen des Verstärkungsfaktors werden allerdings auch Umgebungsgeräusche entsprechend mehr oder weniger verstärkt. Besonders in Kommunikationssituationen, in welchen der Anwender im Wechsel mit einem anderen Menschen spricht, erfolgt dann ein häufiger Wechsel des Verstärkungsfaktors. WO 2014/075195 offenbart ein Hörgerät, in dem eine automatische Verstärkungsanpassung von der Erfassung der Eigenstimme des Benutzers und zusätzlich von den Umgebungsgeräuschen abhängig ist. Vor diesem Hintergrund ist es eine Aufgabe der Erfindung, ein verbessertes Verfahren zum Betrieb eines Hörgeräts anzugeben. Dabei sollen insbesondere die Nachteile, welche sich aus einer dynamischen Anpassung des Verstärkungsfaktors in Abhängigkeit der Stimme des Anwenders ergeben, zumindest verringert und möglichst vermieden werden. Weiterhin soll ein geeignetes Hörgerät angegeben werden.Such an adaptation depending on the speech activity of the user, for example, in the post-published and the applicant with the application file number DE 10 2014 217 172.5 dated 28.8.2014 described. So will In one embodiment, the amplification performed by the hearing aid changes when its own voice is detected. In the EP 1 744 589 A2 For example, a hearing apparatus and a method for self-detection are described. The activity of one's own voice is permanently captured and included in the control of algorithms of the hearing device, thereby avoiding artifacts and false control triggered by one's own voice. For example, in the presence of the hearing aid wearer's own voice, an automatic gain control of the hearing aid is frozen. By a dynamic, ie situational adjustment of the gain but also ambient noise are correspondingly more or less amplified. Especially in communication situations in which the user speaks in alternation with another person, then takes place a frequent change of the gain factor. WO 2014/075195 discloses a hearing aid in which an automatic gain adjustment depends on the detection of the user's own voice and in addition on the ambient noise. Against this background, it is an object of the invention to specify an improved method for operating a hearing device. In particular, the disadvantages which result from a dynamic adaptation of the amplification factor as a function of the user's voice should at least be reduced and avoided as far as possible. Furthermore, a suitable hearing aid should be specified.

Die Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren mit den Merkmalen gemäß Anspruch 1. Vorteilhafte Ausgestaltungen, Weiterbildungen und Varianten sind Gegenstand der Unteransprüche. Weiter wird die Aufgabe gelöst durch ein Hörgerät mit den Merkmalen gemäß Anspruch 14. Dabei ergeben sich weitere Vorteile und geeignete Weiterbildungen sinngemäß aus der Beschreibung im Zusammenhang mit dem Verfahren und umgekehrt.The object is achieved by a method with the features of claim 1. Advantageous embodiments, developments and variants are the subject of the dependent claims. Furthermore, the object is achieved by a hearing aid having the features according to claim 14. In this case, further advantages and suitable developments emerge mutatis mutandis from the description in connection with the method and vice versa.

Das Hörgerät wird von einem Anwender getragen und umfasst zumindest ein Mikrofon zur Aufnahme von Geräuschen aus der Umgebung des Anwenders, einen Verstärker und einen Hörer, zur Ausgabe verstärkter Geräusche. Bei dem Verfahren wird mittels des Mikrofons ein Eingangssignal erzeugt, welches im Verstärker mit einem einstellbaren Verstärkungsfaktor verstärkt wird. Insbesondere ist der Verstärkungsfaktor mittels eines Bedienelementes an einem Gehäuse des Hörgerätes oder mittels einer Fernbedienung durch den Anwender im Sinne einer Lautstärkeregelung manuell einstellbar.The hearing aid is worn by a user and includes at least one microphone for receiving sounds from the environment of the user, an amplifier and a handset, to output amplified sounds. In the method, an input signal is generated by the microphone, which is amplified in the amplifier with an adjustable gain factor. In particular, the amplification factor can be adjusted manually by means of a control element on a housing of the hearing device or by means of a remote control by the user in the sense of a volume control.

Das Hörgerät umfasst weiterhin eine OVD-Einheit, wobei OVD kurz für own voice detection steht. Mittels der OVD-Einheit wird ein OVD-Parameter ermittelt, der angibt, ob der Anwender selbst spricht oder nicht. Auf diese Weise ist insbesondere eine Eigenstimmenerkennung realisiert. Der OVD-Parameter ist hierbei ein erster Parameter. Beispielsweise ist der OVD-Parameter als Boolescher Parameter realisiert, der wahr beträgt, falls der Anwender selbst spricht und andernfalls falsch beträgt. Alternativ ist z.B. auch ein kontinuierlicher OVD-Parameter denkbar. Eine geeignete OVD-Einheit ist insbesondere in der oben bereits erwähnten, nachveröffentlichten Anmeldung mit dem Aktenzeichen DE 10 2014 217 172.5 . beschrieben.The hearing aid further includes an OVD unit, where OVD stands for own voice detection. By means of the OVD unit, an OVD parameter is determined which indicates whether the user speaks for himself or not. In this way, an inherent voice recognition is realized in particular. The OVD parameter is a first parameter here. For example, the OVD parameter is realized as a Boolean parameter, which is true if the user speaks for himself and otherwise is false. Alternatively, for example, a continuous OVD parameter is conceivable. A suitable OVD unit is in particular in the above-mentioned, subsequently filed application with the file reference DE 10 2014 217 172.5 , described.

Der Verstärkungsfaktor wird in Abhängigkeit des OVD-Parameters innerhalb eines bestimmten Wertebereichs eingestellt, wodurch eine dynamische Verstärkungsanpassung in Eigenstimmensituationen realisiert ist. Kennzeichnend für eine Eigenstimmensituation sind insbesondere zeitlich abwechselnde Phasen des Redens und Schweigens des Anwenders, d.h. dieser führt beispielsweise eine Unterhaltung mit einer anderen Person. Im Rahmen der dynamischen Verstärkungsanpassung erfolgt die Verstärkung des Eingangssignals dann abhängig davon, ob der Anwender selbst spricht oder nicht. Vorzugsweise wird der Verstärkungsfaktor in einer Situation, in welcher der Anwender spricht, reduziert im Vergleich zu einer Situation, in welcher der Anwender nicht spricht.The amplification factor is set within a certain value range as a function of the OVD parameter, whereby a dynamic gain adaptation is realized in eigenstimmensituationen. Characteristic of an eigenstimmensituation are in particular temporally alternating phases of speaking and silence of the user, ie this leads, for example, a conversation with another person. As part of the dynamic gain adjustment, the gain of the input signal then takes place depending on whether the user speaks or not. Preferably, the gain factor is reduced in a situation in which the user speaks, compared to a situation in which the user does not speak.

Erfindungsgemäß wird der Verstärkungsfaktor zusätzlich in Abhängigkeit eines Störgeräuschs eingestellt, welches nicht die eigene Stimme des Anwenders ist, sondern vielmehr ein insbesondere externes Störgeräusch, beispielsweise ein Lüfter- oder Motorengeräusch oder allgemein ein Hintergrundgeräusch. Dazu erfolgt insbesondere eine Messung, eine Detektion oder eine Abschätzung des Störgeräuschs. Es wird also zunächst ermittelt, ob ein Störgeräusch vorliegt. Das Störgeräusch ist insbesondere ein stationäres Störgeräusch, welches sich über einen längeren Zeitraum gar nicht oder lediglich in geringem Maße ändert. Insbesondere wird dabei unter stationär verstanden, dass das Störgeräusch ein akustisches Frequenzspektrum aufweist, mit einem mittleren Pegel, welcher sich in einem Zeitraum von etwa 1 bis 10 s um nicht mehr als 3 bis 6 dB verändert. Mit anderen Worten: die statistischen Eigenschaften des Frequenzspektrums des Störgeräusches bleiben über einen bestimmten Zeitraum im Wesentlichen konstant.According to the invention, the amplification factor is additionally set as a function of a noise which is not the user's own voice, but rather a particular external noise, for example a fan or engine noise or generally a background noise. For this purpose, in particular a measurement, a detection or an estimate of the noise occurs. It is therefore first determined whether a noise is present. The noise is in particular a stationary noise, which does not change at all or only to a small extent over a longer period of time. In particular, stationary is understood to mean that the noise has an acoustic frequency spectrum with an average level which does not change by more than 3 to 6 dB over a period of about 1 to 10 s. In other words, the statistical properties of the frequency spectrum of the noise remain essentially constant over a certain period of time.

Ist insbesondere in einer Kommunikationssituation, in welcher der Anwender wechselweise selbst spricht und nicht spricht, zusätzlich ein Umgebungsgeräusch mit einem im Wesentlichen konstanten Lautstärkepegel vorhanden, d.h. ein stationäres Störgeräusch oder Störsignal, so wird auch dieses entsprechend mal mehr und mal weniger verstärkt. Beispiele für solche stationären Störgeräusche sind Lüfter- und Motorgeräusche in einem Fahrzeug. Durch die zeitlich variierende Verstärkung des stationären Umgebungsgeräuschs aufgrund eines ständig angepassten Verstärkungsfaktors in Abhängigkeit der Sprechaktivität des Anwenders, ergibt sich für diesen dann eine als unangenehm empfundene Modulation des Umgebungsgeräuschs. Ist kein Störgeräusch vorhanden, insbesondere kein stationäres Störgeräusch, d.h. falls kein Störgeräusch ermittelt wird, wird insbesondere eine herkömmliche Verstärkungsanpassung in Abhängigkeit des OVD-Parameters vorgenommen.In particular, in a communication situation in which the user alternately speaks and does not speak, in addition there is an environmental noise at a substantially constant volume level, i.e., an ambient noise level. a stationary noise or interference signal, so this is correspondingly times more and sometimes less amplified. Examples of such stationary noise are fan and engine noise in a vehicle. Due to the temporally varying amplification of the stationary ambient noise due to a constantly adjusted amplification factor as a function of the user's speech activity, this results in a perceived as unpleasant modulation of ambient noise. If no noise is present, especially no stationary noise, i. if no noise is detected, in particular a conventional gain adjustment is made as a function of the OVD parameter.

Ein wesentlicher Vorteil der Erfindung besteht nun insbesondere darin, dass eine unangenehme Modulation eines stationären Störgeräuschs aufgrund einer von der eigenen Stimme des Anwenders abhängigen dynamischen Verstärkungsanpassung verhindert wird, insbesondere indem auf vorteilhafte Weise der Wertebereich der dynamischen Verstärkungsanpassung verringert wird. Mit anderen Worten: bei einem Hörgerät mit OVD-Funktionalität und entsprechender Verstärkungsanpassung wird durch das zusätzliche Einstellen in Abhängigkeit eines Störgeräuschs dessen unangenehme Modulation verhindert, insbesondere dadurch, dass die Modulation des Verstärkungsfaktors aufgrund der OVD-Einheit geeignet reduziert wird. Aufgrund der Verstärkungsanpassung in Abhängigkeit des OVD-Parameters weist das verstärkte Eingangssignal, d.h. das Ausgangssignal des Hörgeräts, eine Modulationstiefe auf, welche in Abhängigkeit des Störgeräuschs eingestellt, d.h. insbesondere verringert wird. Ein auf diese Weise betriebenes Hörgerät bietet einen deutlich verbesserten Hörkomfort, insbesondere da die eigene Stimme des Anwenders korrekt wiedergegeben wird und gleichzeitig eine Modulation ansonsten stationärer Störgeräusche vermieden oder zumindest auf ein erträgliches Maß reduziert wird.An essential advantage of the invention is now in particular that an unpleasant modulation of a stationary noise due to one of the own voice of the User-dependent dynamic gain adjustment is prevented, in particular by advantageously reducing the value range of the dynamic gain adjustment. In other words: in a hearing aid with OVD functionality and corresponding gain adjustment, the additional adjustment as a function of a noise prevents its unpleasant modulation, in particular in that the modulation of the amplification factor due to the OVD unit is suitably reduced. Due to the gain adaptation as a function of the OVD parameter, the amplified input signal, ie the output signal of the hearing aid, has a modulation depth which is adjusted as a function of the noise, ie in particular reduced. A hearing aid operated in this way offers significantly improved hearing comfort, in particular since the user's own voice is reproduced correctly and at the same time a modulation of otherwise stationary noise is avoided or at least reduced to an acceptable level.

Ein Kerngedanke hierbei ist insbesondere, dass der Verstärkungsfaktor nicht lediglich unabhängig voneinander einerseits in Abhängigkeit des OVD-Paramaters und andererseits in Abhängigkeit des Störgeräuschs eingestellt wird. Vielmehr beeinflussen sich diese beiden Abhängigkeiten auch gegenseitig, d.h. das Einstellen des Verstärkungsfaktors in Abhängigkeit des OVD-Parameters ist selbst abhängig vom Vorliegen und/oder den Eigenschaften eines Störgeräuschs. Je nachdem, was für eine Störgeräuschsituation vorliegt, ist eine andere dynamische Verstärkungsanpassung aufgrund des OVD-Parameters sinnvoll.A central idea here is, in particular, that the amplification factor is set not only independently of each other on the one hand as a function of the OVD parameter and, on the other hand, as a function of the noise. Rather, these two dependencies also affect each other, i. E. the setting of the gain as a function of the OVD parameter is itself dependent on the presence and / or the properties of a noise. Depending on what kind of noise situation is present, another dynamic gain adjustment based on the OVD parameter makes sense.

Das Einstellen des Verstärkungsfaktors in Abhängigkeit des Störgeräuschs zielt somit insgesamt darauf ab, dasjenige Einstellen des Verstärkungsfaktors, welches in Abhängigkeit des OVD-Parameters erfolgt, zu modifizieren, nämlich in Abhängigkeit des Störgeräuschs. Dies erfolgt beispielsweise durch ein Einstellen des Wertebereichs der dynamischen Verstärkungsanpassung in Abhängigkeit des Störgeräuschs, d.h. durch einen direkten Eingriff in die dynamische Verstärkungsanpassung. Alternativ oder zusätzlich hierzu erfolgt ein zusätzliches Einstellen des Verstärkungsfaktors, um dem Einstellen in Abhängigkeit des OVD-Parameters entgegenzuwirken, d.h. durch eine Überlagerung der dynamischen Verstärkungsanpassung, um diese im Endergebnis zu modifizieren. Unter "modifizieren" wird allgemein verstanden, dass letztendlich eine Anpassung, ein Ausgleich oder eine Änderung erfolgt. Im vorliegenden Fall erfolgt eine Modifikation der Verstärkungsanpassung durch ein zusätzliches Einstellen in Abhängigkeit eines Störgeräuschs. Demzufolge wird nicht lediglich der Verstärkungsfaktor in Abhängigkeit des OVD-Parameters eingestellt, sondern der Verstärkungsfaktor wird in Abhängigkeit des OVD-Parameters unter Berücksichtigung eines Störgeräuschs eingestellt. Dadurch ist dann vorteilhaft gewährleistet, dass in unterschiedlichen Störgeräuschsituationen die Verstärkungsanpassung aufgrund der OVD-Einheit in Abhängigkeit des Störgeräuschs optimal modifiziert wird.The adjustment of the amplification factor as a function of the noise thus altogether aims to modify that setting of the amplification factor which takes place as a function of the OVD parameter, namely as a function of the noise. This is done, for example, by setting the value range of the dynamic gain adjustment depending on the noise, ie by a direct intervention in the dynamic gain adjustment. Alternatively or additionally, the amplification factor is additionally set in order to counteract the adjustment as a function of the OVD parameter, ie by superimposing the dynamic gain adjustment in order to modify it in the end result. By "modify" is generally understood that ultimately an adjustment, compensation or change takes place. In the present case, a modification of the gain adjustment by an additional adjustment in response to a noise occurs. As a result, not only is the gain adjusted in accordance with the OVD parameter, but the gain is adjusted in accordance with the OVD parameter taking into account a noise. This advantageously ensures that in different noise situations, the gain adjustment due to the OVD unit is optimally modified as a function of the noise.

Üblicherweise wird im Rahmen einer Einstellung des Verstärkungsfaktors mittels der OVD-Einheit der Verstärkungsfaktor reduziert, falls der Anwender selbst spricht, und erhöht, falls der Anwender nicht selbst spricht. Liegt allerdings ein stationäres Störgeräusch vor, wird nun erfindungsgemäß der Verstärkungsfaktor beispielsweise bei einer Sprechaktivität des Anwenders gar nicht verringert oder weniger verringert, im Vergleich zu einem Hörgerät ohne solch zusätzliche Einstellung in Abhängigkeit eines stationären Störgeräuschs. Dadurch ist dann eine Modulation des Störgeräuschs bei wechselnder Sprechaktivität des Anwenders entsprechend reduziert oder gänzlich vermieden und es ergibt sich für den Anwender eine angenehmere und natürlichere Wiedergabe von Umgebungsgeräuschen.Usually, in the context of adjustment of the gain by means of the OVD unit, the gain is reduced if the user speaks for himself, and increased if the user does not speak himself. However, if there is a stationary noise, according to the invention, the amplification factor, for example, at a speech activity of the user is not reduced or less, compared to a hearing aid without such additional adjustment in response to a stationary noise. As a result, a modulation of the noise when changing the user's speech activity is then reduced accordingly or avoided altogether and it results in a more pleasant and more natural reproduction of ambient noise for the user.

In einer bevorzugten Ausgestaltung wird mittels eines Störgeräuschschätzers, auch als noise estimator bezeichnet, eine Intensität des Störgeräuschs ermittelt und der Verstärkungsfaktor in Abhängigkeit der Intensität eingestellt. Dabei ist die Intensität ein zweiter Parameter, welcher zusätzlich zum OVD-Parameter zur Einstellung des Verstärkungsfaktors herangezogen wird. Diese intensitätsabhängige Anpassung des Verstärkungsfaktors ermöglicht auf vorteilhafte Weise einen optimalen Kompromiss zwischen einer Reduzierung des Verstärkungsfaktors aufgrund der eigenen Stimme und einer Nicht-Reduzierung zur Vermeidung einer Modulation des Störgeräuschs.In a preferred embodiment, an intensity of the noise is determined by means of a noise estimator, also referred to as a noise estimator, and the amplification factor adjusted depending on the intensity. The intensity is a second parameter which is used in addition to the OVD parameter for setting the amplification factor. This intensity-dependent adjustment of the amplification factor advantageously enables an optimum compromise between a reduction of the amplification factor due to the own voice and a non-reduction to avoid a modulation of the noise.

Vorzugsweise wird bei eigener Sprechaktivität des Anwenders bei einer höheren ermittelten Intensität, d.h. bei einem lauteren Störgeräusch, ein größerer Verstärkungsfaktor eingestellt als bei einer im Vergleich geringeren Intensität, d.h. einem leiseren Störgeräusch, und bei einer geringeren ermittelten Intensität ein geringerer Verstärkungsfaktor als bei einer im Vergleich höheren Intensität. Dadurch wird vorteilhafterweise beim Wechsel des Verstärkungsfaktors in Abhängigkeit des OVD-Parameters der Unterschied zwischen dem bei Phasen eigener Sprechaktivität eingestellten Verstärkungsfaktor und dem bei Phasen eigener Inaktivität eingestellten Verstärkungsfaktor verringert. Unter eigener Sprechaktivität wird insbesondere verstanden, dass der Anwender selbst spricht, während dieser bei eigener Inaktivität entsprechend nicht selbst spricht.Preferably, at the user's own speech activity at a higher detected intensity, i. with a louder noise, set a larger gain than with a lower intensity, i. a lesser noise, and at a lower detected intensity a lower gain than at a higher intensity. This advantageously reduces the difference between the amplification factor set during phases of one's own speech activity and the amplification factor set during phases of inherent inactivity when changing the amplification factor as a function of the OVD parameter. Under his own speech activity is understood in particular that the user speaks himself, while this does not speak itself in own inactivity.

Der beschriebenen Maßnahme liegt die Erkenntnis zugrunde, dass die Modulation eines Störgeräusches mit geringerer Lautstärke, also geringerer Intensität als weniger störend empfunden wird als die Modulation eines Störgeräusches mit im Vergleich dazu höherer Intensität. Daher wird in einer Eigenstimmensituation bei einem lauteren Störgeräusch vorteilhafterweise der Verstärkungsfaktor ausgehend vom Verstärkungsfaktor bei eigener Inaktivität weniger reduziert als bei einem leiseren Störgeräusch, sodass insbesondere die Modulation des Störgeräusches aufgrund des Umschaltens mittels der OVD-Einheit bei lauteren Störgeräuschen vorteilhaft verringert ist. In einer bevorzugten Ausgestaltung wird somit zu Zeiten eigener Sprechaktivität des Anwenders bei einer ersten ermittelten Intensität ein erster Verstärkungsfaktor eingestellt und bei einer zweiten Intensität ein zweiter Verstärkungsfaktor, wobei der erste Verstärkungsfaktor größer ist als der zweite Verstärkungsfaktor falls die erste Intensität größer ist als die zweite Intensität und geringer, falls die erste Intensität geringer ist als die zweite Intensität. Beispielsweise beträgt die erste Intensität etwa 50 dB und die zweite Intensität ist größer und beträgt etwa 80 dB, dann wird im Falle der ersten Intensität ein geringerer Verstärkungsfaktor eingestellt als im Falle der zweiten Intensität, wobei beide Verstärkungsfaktoren jeweils geringer sind als derjenige Verstärkungsfaktor, welcher eingestellt wird, falls der Anwender selbst nicht spricht. Ein lauteres Störgeräusch wird dann im Vergleich zu einem leiseren Störgeräusch weniger moduliert.The described measure is based on the finding that the modulation of a noise with a lower volume, ie lower intensity is perceived as less disturbing than the modulation of a noise with higher intensity in comparison. Therefore, in an inherent voice situation with a loud noise, advantageously, the gain factor from the self-inactivity gain factor is less reduced than with a quieter noise, so that in particular the modulation of the noise due to the OVD unit switchover is advantageously reduced with noisy noise. In a preferred embodiment is thus at times own speech activity of the user at a first detected intensity set a first gain and at a second intensity, a second gain, wherein the first gain is greater than the second gain if the first intensity is greater than the second intensity and less if the first intensity is lower is as the second intensity. For example, the first intensity is about 50 dB and the second intensity is greater and about 80 dB, then a lower gain factor is set in the case of the first intensity than in the case of the second intensity, both gain factors being smaller than the gain factor which is set if the user does not speak himself. A louder noise is then less modulated compared to a quieter noise.

Somit wird allgemein bei höherer ermittelter Intensität die durch die OVD-Einheit erzeugte Änderung des Verstärkungsfaktors vorzugsweise reduziert und dabei zu Zeiten eigener Sprechaktivität ein höherer Verstärkungsfaktor eingestellt. Bei geringerer Intensität wird entsprechend die Änderung des Verstärkungsfaktors vergrößert, sodass zu Zeiten eigener Sprechaktivität ein geringerer Verstärkungsfaktor eingestellt wird. Vorzugsweise erfolgt die Einstellung des Verstärkungsfaktors zu Zeiten eigener Sprechaktivität proportional zur ermittelten Intensität oder alternativ unter- oder überproportional.Thus, generally with a higher detected intensity, the change in the gain produced by the OVD unit is preferably reduced, thereby setting a higher gain factor at times of own speech activity. At lower intensity, the change in the amplification factor is correspondingly increased so that a lower amplification factor is set at times of one's own speech activity. Preferably, the setting of the amplification factor at times own speech activity is proportional to the determined intensity or alternatively under or disproportionately.

Der Störgeräuscheschätzer ermittelt die Intensität, d.h. die Lautstärke oder den Lautstärkepegel des Störgeräuschs insbesondere aus dem Eingangssignal. Zur Ermittlung der Intensität, wird vorzugsweise ein Verfahren, insbesondere Algorithmus verwendet, welches bzw. welcher lediglich stationäre Anteile eines Störgeräuschs berücksichtigt. Der Vorteil besteht hierbei insbesondere darin, dass ein solches Verfahren prinzipbedingt lediglich zur Ermittlung stationärer Störgeräusche verwendbar ist und nicht-stationäre Störgeräusche nicht erfasst werden. Da eine Modulation nicht-stationärer, d.h. insbesondere bereits modulierter Störgeräusche üblicherweise vom Anwender nicht als störend empfunden wird, brauchen diese entsprechend beim Verfahren zum Betrieb des Hörgerätes nicht beachtet zu werden; stattdessen wird dann der Verstärkungsfaktor im Wesentlichen abhängig vom OVD-Parameter eingestellt. Erst bei Vorliegen eines stationären Signals wird der Verstärkungsfaktor zusätzlich abhängig von diesem lediglich stationären Störgeräusch eingestellt. Andersherum ist somit im Falle von lediglich modulierten Störgeräuschen eine optimale OVD-Funktionalität des Hörgerätes gewährleistet.The noise estimator determines the intensity, ie the volume or the volume level of the noise, in particular from the input signal. To determine the intensity, preferably a method, in particular algorithm is used which takes into account only stationary portions of a noise. The advantage in this case is, in particular, that such a method can be used in principle only to determine stationary noise and non-stationary noise can not be detected. Because a modulation is non-stationary, ie in particular already modulated noise is usually not perceived by the user as disturbing, they need not be considered accordingly in the method for operating the hearing aid; instead, the gain factor will then be set substantially dependent on the OVD parameter. Only in the presence of a stationary signal, the gain is additionally adjusted depending on this only stationary noise. On the other hand, in the case of only modulated noise, an optimal OVD functionality of the hearing aid is thus ensured.

Ein besonders geeignetes Verfahren ist ein sogenanntes minimum-statistics-Verfahren. Daher wird in einer geeigneten Variante die Intensität des Störgeräuschs mittels eines minimum-statistics-Verfahrens ermittelt. Der Störgeräuscheschätzer ist dann zur Durchführung eines solchen minimum-statistics-Verfahren ausgebildet und ermittelt die Intensität, d.h. den Lautstärkepegel insbesondere durch eine entsprechende statistische Auswertung des Eingangssignals. Eine mögliche Ausgestaltung eines minimum-statistics-Verfahrens ist beispielsweise beschrieben in: Martin, R. (1994), "Spectral subtraction based on minimum statistics .". Ein minimum-statistics-Verfahren ist besonders einfach zu implementieren und ist prinzipbedingt lediglich zur Ermittlung stationärer Störgeräusche verwendbar, während nicht-stationäre Störgeräusch im Wesentlichen ignoriert werden, wodurch sich wiederum die oben erwähnten Vorteile ergeben.A particularly suitable method is a so-called minimum-statistics method. Therefore, in a suitable variant, the intensity of the noise is determined by means of a minimum statistics method. The noise estimator is then designed to carry out such a minimum statistics method and determines the intensity, ie the volume level, in particular by means of a corresponding statistical evaluation of the input signal. A possible embodiment of a minimum-statistics method is described, for example, in: Martin, R. (1994), "Spectral subtraction based on minimum statistics A minimum-statistics method is particularly simple to implement and, in principle, can only be used to detect stationary noise, while non-stationary noise is essentially ignored, which in turn results in the advantages mentioned above.

Das Eingangssignal wird zunächst insbesondere in eine Vielzahl von aufeinanderfolgenden Zeitintervallen unterteilt, aus denen jeweils mittels einer Fourier-Transformation ein Frequenzspektrum ermittelt wird, d.h. ein Spektrum, bei dem jeder Frequenz ein bestimmter Pegel zugeordnet ist. Mittels des Störgeräuscheschätzers wird dann die Intensität insbesondere dadurch ermittelt, dass in einer Anzahl von Frequenzbereichen eines jeweiligen Frequenzspektrums jeweils der Pegel gemessen wird, welcher dann insbesondere der Intensität des Störgeräusches im entsprechenden Frequenzbereich entspricht.The input signal is first of all subdivided into a multiplicity of successive time intervals, from which a frequency spectrum is determined in each case by means of a Fourier transformation, ie a spectrum in which a specific level is assigned to each frequency. By means of the noise estimator, the intensity is then determined in particular by measuring the level in a number of frequency ranges of a respective frequency spectrum which corresponds in particular to the intensity of the noise in the corresponding frequency range.

Unterhalb einer bestimmten und insbesondere frequenzabhängigen minimalen Intensität, beispielsweise einem Schalldruckpegel von etwa 50 dB, erfolgt zweckmäßigerweise keine Anpassung des Verstärkungsfaktors in Abhängigkeit der Intensität, da entsprechend leise Störgeräusche vom Anwender weniger stark wahrgenommen werden als solche mit einer höheren Intensität. Wird dagegen ein stationäres Störgeräusch mit einer höheren Intensität als der minimalen Intensität ermittelt, so erfolgt zusätzlich eine Anpassung des Verstärkungsfaktors zur Vermeidung oder zumindest Reduzierung einer möglichen Modulation des Störgeräuschs durch die OVD-Einheit.Below a certain and in particular frequency-dependent minimum intensity, for example a sound pressure level of about 50 dB, there is expediently no adjustment of the amplification factor as a function of the intensity, since correspondingly quieter noise is perceived by the user to be less pronounced than those with a higher intensity. If, on the other hand, a steady-state noise with a higher intensity than the minimum intensity is determined, an additional adaptation of the amplification factor to avoid or at least reduce a possible modulation of the noise by the OVD unit takes place.

In einer weiteren bevorzugten Ausgestaltung wird mittels eines Stationaritätsdetektors eine Stationarität des Störgeräuschs als ein dritter Parameter ermittelt und der Verstärkungsfaktor wird in Abhängigkeit der Stationarität eingestellt. Dadurch ist es in verbesserter Weise möglich, zwischen stationären und nicht-stationären Störgeräuschen zu unterscheiden. Die Ermittlung der Stationarität erfolgt geeigneterweise mittels einer statistischen Untersuchung des Eingangssignals.
Daher wird in einer geeigneten Ausgestaltung die Stationarität als eine Intensitätsstabilität ermittelt, beispielsweise als Varianz des mittleren Pegels oder des Pegels in einem bestimmten Frequenzbereich und über einen bestimmten Zeitraum, d.h. insbesondere über mehrere Frequenzspektren hinweg. Beispielsweise wird die Varianz des Pegels bei etwa 1 kHz über einen Zeitraum von etwa 1 s ermittelt.
In a further preferred embodiment, a stationarity of the noise is determined as a third parameter by means of a stationarity detector and the amplification factor is set as a function of the stationarity. This makes it possible in an improved way to distinguish between stationary and non-stationary noise. The determination of the stationarity is suitably carried out by means of a statistical examination of the input signal.
Therefore, in a suitable embodiment, the stationarity is determined as an intensity stability, for example as a variance of the mean level or the level in a certain frequency range and over a certain period of time, ie in particular over several frequency spectra. For example, the variance of the level is determined at about 1 kHz over a period of about 1 s.

Zusätzlich oder alternativ wird geeigneterweise die Stationarität als eine Frequenzstabilität ermittelt. Dazu wird insbesondere im Frequenzspektrum des Eingangssignals ein Pegelmaximum ermittelt und die Varianz der diesem Pegelmaximum zugeordneten Frequenz ermittelt.Additionally or alternatively, the stationarity is suitably determined as a frequency stability. For this purpose, a level maximum is determined, in particular in the frequency spectrum of the input signal, and the variance of the frequency assigned to this level maximum is determined.

Zusätzlich oder alternativ wird geeigneterweise die Stationarität als Verhältnis der Pegel von stationären und nicht-stationären Anteilen des Störgeräuschs ermittelt. Dazu werden insbesondere die jeweiligen Pegel ermittelt und zueinander ins Verhältnis gesetzt.Additionally or alternatively, the stationarity is suitably determined as the ratio of the levels of stationary and non-stationary portions of the noise. In particular, the respective levels are determined and set in relation to each other.

Desweiteren wird zweckmäßigerweise durch Vorgabe eines Stationaritäts-Schwellwerts eine definierte Abgrenzung zwischen stationären und nicht-stationären Störgeräuschen vorgenommen. Wird dann eine Stationarität ermittelt, welche den Stationaritäts-Schwellwert überschreitet, so wird das Störgeräusch als nicht-stationär angesehen und es erfolgt keine zusätzliche Einstellung des Verstärkungsfaktors. Liegt die Stationarität jedoch unterhalb des Stationaritäts-Schwellwerts, so wird entsprechend ein stationäres Störgeräusch erkannt und der Verstärkungsfaktor entsprechend eingestellt.Furthermore, it is expedient to carry out a defined demarcation between stationary and non-stationary noise by specifying a stationarity threshold value. If a stationarity is then determined which exceeds the stationarity threshold, then the noise is regarded as non-stationary and no additional adjustment of the amplification factor takes place. However, if the stationarity is below the stationarity threshold, a stationary noise is correspondingly detected and the amplification factor is set accordingly.

In einer bevorzugten Weiterbildung werden die Parameter jeweils auf einen Skalierungsfaktor beispielsweise im Bereich von 0 bis 1 abgebildet und der Verstärkungsfaktor wird durch Multiplikation mit den Skalierungsfaktoren eingestellt. Allgemein erfolgt die Verstärkung des Eingangssignals mit dem vom Verstärker vorgegebenen Verstärkungsfaktor. Dadurch, dass der zunächst vorgegebene Verstärkungsfaktor mit einer Anzahl von Skalierungsfaktoren multipliziert wird, wird der Verstärkungsfaktor auf besonders einfache Weise jeweils in Abhängigkeit der Parameter eingestellt, nämlich abhängig vom OVD-Parameter, d.h. von einer OVD-Situation, der Stationarität, d.h. dem Vorhandensein eines stationären Störgeräuschs, sowie der Intensität, d.h. der Lautstärke des stationären Störgeräuschs.In a preferred development, the parameters are each mapped to a scaling factor, for example in the range from 0 to 1, and the amplification factor is set by multiplication by the scaling factors. In general, the amplification of the input signal is performed with the amplification factor specified by the amplifier. By multiplying the initially specified gain factor by a number of scaling factors, the gain factor is set in a particularly simple manner depending on the parameters, namely depending on the OVD parameter, i. from an OVD situation, stationarity, i. the presence of a stationary noise, as well as the intensity, i. the volume of the stationary noise.

Die Abbildung erfolgt insbesondere im Sinne eines sogenannten mappings, bei welchem einem bestimmten Wert eines Parameters ein Wert des dimensionslosen Intervalls 0 bis 1 zugeordnet wird. Insbesondere wird lediglich ein beschränkter Wertebereich eines jeweiligen Parameters auf das Intervall abgebildet. Beispielsweise erfolgt eine Abbildung der Intensität lediglich für Schalldruckpegel aus einem Bereich von etwa 50 bis 80 dB, wobei bei höherem Schalldruckpegel, d.h. höherer Intensität und während der Anwender selbst nicht spricht eine höhere Verstärkung erfolgen soll und entsprechend einer Intensität von 80 dB der Skalierungsfaktor 0 zugeordnet wird und einer Intensität von 50 dB ein Skalierungsfaktor von 1. Innerhalb des beschränkten Wertebereichs erfolgt die Zuordnung beispielsweise linear oder logarithmisch; außerhalb wird entsprechend konstant 0 bzw. 1 zugeordnet.The mapping takes place in particular in the sense of a so-called mapping, in which a value of the dimensionless interval 0 to 1 is assigned to a specific value of a parameter. In particular, only a limited value range of a respective parameter is mapped to the interval. For example, a picture of the intensity only for sound pressure level from a range of about 50 to 80 dB, wherein at a higher sound pressure level, ie higher intensity and while the user does not speak even higher amplification to take place and assigned according to an intensity of 80 dB, the scaling factor 0 and, with an intensity of 50 dB, a scaling factor of 1. Within the limited value range, the assignment takes place, for example, linearly or logarithmically; outside is correspondingly constant 0 or 1 assigned.

Vorzugsweise werden die Skalierungsfaktoren zunächst zu einem Gesamt-Skalierungsfaktor zusammengefasst und der Verstärkungsfaktor wird dann durch Multiplikation mit dem Gesamt-Skalierungsfaktor eingestellt. Hierbei erfolgt das Zusammenfassen insbesondere mittels eines Multiplikators, mit den Skalierungswerten als Eingangswerten und dem Gesamt-Skalierungsfaktor als Ausgangswert. Dieser bildet dann insbesondere das Resultat einer Szenenanalyse ab, welche vom Hörgerät hinsichtlich der Sprechaktivität des Anwenders und dem Vorliegen von stationären Störgeräuschen durchgeführt wird.Preferably, the scaling factors are first combined into a total scaling factor, and the gain factor is then set by multiplying by the total scaling factor. In this case, the combining takes place in particular by means of a multiplier, with the scaling values as input values and the total scaling factor as the output value. This then forms in particular the result of a scene analysis, which is performed by the hearing aid in terms of the user's speech activity and the presence of stationary noise.

Das Eingangssignal ist typischerweise aus verschiedenen Frequenzen zusammengesetzt, welche insbesondere ein akustisches Frequenzspektrum mit einer Anzahl von Frequenzbereichen bilden. Häufig werden zudem verschiedene Frequenzen oder Frequenzbereiche des Frequenzspektrums unterschiedlich verstärkt, da beispielsweise einem bestimmten Frequenzbereich eine höhere Bedeutung beigemessen wird. Vorzugsweise wird daher auch der Verstärkungsfaktor frequenzabhängig eingestellt, insbesondere sind dazu die Skalierungsfaktoren frequenzabhängig, d.h. jeweils eine Funktion der Frequenz.The input signal is typically composed of different frequencies, which in particular form an acoustic frequency spectrum with a number of frequency ranges. Frequently, moreover, different frequencies or frequency ranges of the frequency spectrum are amplified differently, since, for example, a particular frequency range is given greater importance. Preferably, therefore, the gain factor is set frequency-dependent, in particular the scaling factors are frequency-dependent, i. each a function of frequency.

In einer zweckmäßigen Weiterbildung wird in unterschiedlichen Frequenzbereichen, auch als Frequenzbänder bezeichnet, des Eingangssignals jeweils eine unabhängige Einstellung des Verstärkungsfaktors vorgenommen. Vorzugsweise werden dabei unterschiedlich bedeutsame Frequenzbereiche unabhängig voneinander und je nach Bedarf einer entsprechend angepassten dynamischen Verstärkungsanpassung zu unterziehen.In an expedient development, an independent adjustment of the amplification factor is carried out in different frequency ranges, also referred to as frequency bands, of the input signal. Preferably, different significant frequency ranges are independent of each other and subject to a correspondingly adapted dynamic gain adjustment as needed.

Zweckmäßigerweise ist dann z.B. auch die oben erwähnte Ermittlung der Intensität auf einen Frequenzbereich beschränkt, welcher von der Verstärkung am meisten beeinflusst wird, d.h. in welchem der frequenzabhängige Verstärkungsfaktor maximal ist.Conveniently, then, e.g. also limited the above-mentioned determination of the intensity to a frequency range which is most affected by the gain, i. in which the frequency-dependent amplification factor is maximal.

Das Hörgerät weist zur Durchführung des Verfahrens insbesondere eine Steuereinheit auf. Diese ist in geeigneter Weise mit dem Verstärker verbunden und umfasst entsprechende Module zum Einstellen des Verstärkungsfaktors. Die Module sind insbesondere die OVD-Einheit sowie der Störgeräuschschätzer und/oder der Stationaritätsdetektor. Dabei ist beispielsweise eine Ausgestaltung der Steuereinheit als anwendungsspezifische integrierte Schaltung, sogenannte ASIC, denkbar, wobei die Module jeweils als Teil dieser Schaltung realisiert sind. Alternativ ist auch eine Ausgestaltung als programmierbarer Mikrokontroller möglich, bei dem die Module teilweise oder vollständig als Programmmodule realisiert sind.In particular, the hearing device has a control unit for carrying out the method. This is suitably connected to the amplifier and comprises corresponding modules for adjusting the amplification factor. The modules are in particular the OVD unit as well as the noise estimator and / or the stationarity detector. In this case, for example, an embodiment of the control unit as an application-specific integrated circuit, so-called ASIC, conceivable, wherein the modules are each realized as part of this circuit. Alternatively, a configuration as a programmable microcontroller is possible, in which the modules are partially or completely implemented as program modules.

Zusammenfassend bestehen die Vorteile der Erfindung insbesondere darin, dass zusätzlich zu einer dynamischen Anpassung des Verstärkungsfaktors in Abhängigkeit der Sprechaktivität des Anwenders des Hörgeräts eine erweiterte dynamische Anpassung unter Berücksichtigung von stationären Störgeräuschen vorgenommen wird. Dazu wird insbesondere die Intensität und/oder Stationarität als charakteristische Parameter eines jeweiligen stationären Störgeräuschs ermittelt und zur Anpassung des Verstärkungsfaktors verwendet. Zur besonders effektiven Modifikation des Verstärkungsfaktors werden die ermittelten Parameter auf Skalierungsfaktoren abgebildet.In summary, the advantages of the invention are, in particular, that in addition to a dynamic adjustment of the amplification factor as a function of the speech activity of the user of the hearing aid, an extended dynamic adjustment is made taking into account stationary noise. For this purpose, in particular the intensity and / or stationarity is determined as characteristic parameters of a respective stationary noise and used to adapt the amplification factor. For a particularly effective modification of the amplification factor, the determined parameters are mapped to scaling factors.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher erläutert. Darin zeigen schematisch:

FIG 1
ein Hörgerät und
FIG 2
ein Schaltbild des Hörgeräts.
An embodiment of the invention will be explained in more detail with reference to a drawing. In it show schematically:
FIG. 1
a hearing aid and
FIG. 2
a circuit diagram of the hearing aid.

In FIG 1 ist ein Hörgerät 2 gezeigt, welches hier ein sogenanntes RIC-Gerät ist und ein Gehäuse 4 umfasst, welches von einem nicht gezeigten Anwender hinter dem Ohr getragen wird. Als wesentliche Komponenten umfasst das Hörgerät 2 weiterhin eine Anzahl von Mikrofonen 6, eine Steuereinheit 8, einen Verstärker 10 und einen Hörer 12. Weiterhin ist eine Batterie 14 zur Energieversorgung vorhanden.In FIG. 1 a hearing aid 2 is shown, which here is a so-called RIC device and comprises a housing 4, which is supported by a user, not shown, behind the ear. As essential components, the hearing device 2 further comprises a number of microphones 6, a control unit 8, an amplifier 10 and a receiver 12. Furthermore, a battery 14 for the power supply is present.

Mittels der Mikrofone 6 wird ein Eingangssignal E generiert, welches im Betrieb zur Verstärkung an den Verstärker 10 weitergegeben und dort mit einem bestimmten Verstärkungsfaktor V verstärkt wird. Das auf diese Weise verstärkte Eingangssignal E wird dann über den Hörer 12, genauer gesagt über einen hier nicht näher gezeigten Lautsprecher des Hörers 12 ausgegeben. In dem hier gezeigten Ausführungsbeispiel wird der Hörer 12 vom Anwender direkt im Ohr getragen und ist über eine geeignete Zuleitung 16 mit dem Verstärker 10 verbunden. Grundsätzlich ist es jedoch auch möglich, dass das Hörgerät 2 ein BtE-Gerät ist, bei dem der Hörer 12 im oder am Gehäuse 4 angebracht ist und die Zuleitung 16 als Schallschlauch ausgebildet ist. In einer weiteren möglichen Alternative ist das Hörgerät 2 dagegen ein CIC-Gerät, welches vollständig im Ohr getragen wird.By means of the microphones 6, an input signal E is generated which, during operation, is passed on to the amplifier 10 for amplification and amplified there with a specific amplification factor V. The thus amplified input signal E is then output via the handset 12, more precisely via a loudspeaker of the handset 12, not shown here in detail. In the embodiment shown here, the handset 12 is worn by the user directly in the ear and is connected via a suitable lead 16 to the amplifier 10. In principle, however, it is also possible for the hearing device 2 to be a BTE device, in which the handset 12 is mounted in or on the housing 4 and the supply line 16 is designed as a sound tube. In a further possible alternative, however, the hearing aid 2 is a CIC device, which is worn completely in the ear.

Im Folgenden wird ein Verfahren zum Betrieb des Hörgeräts 2 anhand des in FIG 2 gezeigten Schaltbildes näher erläutert. Deutlich zu erkennen ist zunächst die Generierung des Eingangssignals E durch zumindest ein Mikrofon 6, dessen Verstärkung mit dem Verstärkungsfaktor V im Verstärker 10 zum Ausgangssignal A und schließlich dessen Ausgabe über den Hörer 12. In dem hier gezeigten Ausführungsbeispiel erfolgt vor der Verstärkung zudem noch mittels eines Präprozessors 18 eine zusätzliche Bearbeitung, beispielsweise eine Filterung oder Ähnliches. Der Präprozessor 18 generiert somit ein modifiziertes Eingangssignal E, welches im Folgenden der Einfachheit halber ebenfalls als Eingangssignal E bezeichnet wird.In the following, a method for operating the hearing device 2 on the basis of in FIG. 2 shown circuit diagram explained in more detail. The generation of the input signal E by means of at least one microphone 6, its amplification with the amplification factor V in the amplifier 10 to the output signal A and finally its output via the receiver 12 can be clearly recognized. In the exemplary embodiment shown here, before the amplification, there is also a signal Preprocessor 18 additional processing, such as filtering or the like. The preprocessor 18 thus generates a modified one Input signal E, which is hereinafter also referred to as input signal E for the sake of simplicity.

Der Verstärkungsfaktor V ist mittels der Steuereinheit 8 einstellbar. Zusätzlich dazu ist der Verstärkungsfaktor möglicherweise auch in anderer, nicht näher gezeigter Weise einstellbar, beispielsweise manuell durch ein nicht dargestelltes Bedienelement am Hörgerät 2. Das Einstellen des Verstärkungsfaktors V durch die Steuereinheit 8 erfolgt in FIG 2 durch einen Gesamt-Skalierungsfaktor G, welcher von der Steuereinheit 8 bereitgestellt wird. Dabei wird der herkömmlicherweise verwendete Verstärkungsfaktor V mit dem Gesamt-Skalierungsfaktor G multipliziert, um einen angepassten Verstärkungsfaktor V zu erhalten.The amplification factor V is adjustable by means of the control unit 8. In addition to this, the amplification factor may also be adjustable in another way, not shown in more detail, for example manually by an operating element (not shown) on the hearing device 2. The amplification factor V is set by the control unit 8 FIG. 2 by an overall scaling factor G provided by the control unit 8. In this case, the conventionally used amplification factor V is multiplied by the overall scaling factor G in order to obtain a matched amplification factor V.

Der Gesamt-Verstärkungsfaktor G ist das Resultat einer von der Steuereinheit 8 durchgeführten Analyse des Eingangssignals E. Die Analyse erfolgt dabei im Wesentlichen hinsichtlich der Sprechaktivität des Anwenders und eventueller Störgeräusche im Umfeld des Anwenders. Dazu umfasst die Steuereinheit 8 mehrere, hier drei Module 20, 22, 24, nämlich eine OVD-Einheit 20, einen Störgeräuschschätzer 22 und einen Stationaritätsdetektor 24. Diese generieren jeweils einen Skalierungsfaktor S1, S2, S3 auf Grundlage charakteristischer Parameter, die aus dem Eingangssignal E ermittelt werden. Diese drei Skalierungsfaktoren S1, S2, S3 werden mittels eines Multiplikators 26 zum Gesamt-Skalierungsfaktor G zusammengefügt.The overall amplification factor G is the result of an analysis of the input signal E carried out by the control unit 8. The analysis essentially takes place with regard to the speech activity of the user and possible noises in the environment of the user. For this purpose, the control unit 8 comprises several, here three modules 20, 22, 24, namely an OVD unit 20, a noise estimator 22 and a stationarity detector 24. These each generate a scaling factor S1, S2, S3 on the basis of characteristic parameters derived from the input signal E can be determined. These three scaling factors S1, S2, S3 are combined by means of a multiplier 26 to the total scaling factor G.

Konkret wird in dem hier gezeigten Ausführungsbeispiel zunächst mittels der OVD-Einheit 20 ein OVD-Parameter ermittelt, der angibt, ob der Anwender selbst spricht, also ob eine Sprechaktivität des Anwenders vorliegt. Ist dies der Fall, soll der Verstärkungsfaktor V reduziert werden, ansonsten erhöht werden. Dazu wird der OVD-Parameter auf den Skalierungsfaktor S1 in einen Bereich zwischen 0 und 1 abgebildet. Beispielsweise erfolgt die Abbildung derart, dass bei eigener Sprechaktivität des Anwenders der Skalierungsfaktor S1 0 beträgt und andernfalls 1. Der Verstärkungsfaktor V wird dann je nach Situation derart eingestellt, dass entweder keine Verstärkung oder maximale Verstärkung erfolgt. Alternativ erfolgt eine Abstufung, z. B. aufgrund des Pegels, d. h. der Lautstärke der Stimme des Anwenders.Specifically, in the exemplary embodiment shown here, an OVD parameter is first determined by means of the OVD unit 20, which indicates whether the user speaks for himself, that is, whether the user's speech activity is present. If this is the case, the gain factor V should be reduced, otherwise increased. For this, the OVD parameter is mapped to the scaling factor S1 in a range between 0 and 1. For example, the mapping takes place in such a way that the scaling factor S1 is 0 in the case of the user's own speech activity and otherwise 1. The gain V is then adjusted according to the situation such that either no gain or maximum gain occurs. Alternatively, a gradation, z. B. due to the level, ie the volume of the user's voice.

Mittels des Störgeräuschschätzers 22 wird ein eventuell mit aufgenommenes Störgeräusch analysiert, und zwar bezüglich dessen Intensität. Von besonderem Interesse sind hierbei lediglich stationäre Störgeräusche. Daher erfolgt die Analyse hier mittels eines minimum-statistics-Verfahrens. Die ermittelte Intensität als charakteristischer Parameter des Störgeräuschs gibt insbesondere dessen Lautstärke an und ist somit ein Maß für die Lautstärke von stationären Hintergrundgeräuschen. Die Intensität wird nun derart auf den Skalierungsfaktor S2 abgebildet, dass stationäre Störgeräusche bei einem Anpassen des Skalierungsfaktors S1 durch die OVD-Einheit 22 möglichst wenig moduliert werden und zwar umso weniger, je lauter die Störgeräusche sind. Bei geringer Intensität wird demnach keine oder nur eine geringe Anpassung des Verstärkungsfaktors V über den Skalierungsfaktor S2 des Störgeräuscheschätzers 22 vorgenommen. Bei hoher Intensität wird dagegen dem durch die OVD-Einheit 20 vorgegebenen Skalierungsfaktor S1 entgegengewirkt.By means of the noise estimator 22, a possibly recorded noise is analyzed, with respect to its intensity. Of particular interest here are only stationary noise. Therefore, the analysis is done here by means of a minimum-statistics-method. The determined intensity as a characteristic parameter of the noise indicates in particular its volume and is thus a measure of the volume of stationary background noise. The intensity is now mapped to the scaling factor S2, that stationary noise when modulating the scaling factor S1 by the OVD unit 22 are modulated as little as possible, and the less, the louder the noise. At low intensity, therefore, no or only a slight adjustment of the amplification factor V is made via the scaling factor S2 of the noise estimator 22. At high intensity, however, the predetermined by the OVD unit 20 scaling factor S1 is counteracted.

Durch den Stationaritätsdetektor 24 wird zusätzlich ermittelt, inwiefern es sich bei dem Störgeräusch tatsächlich um ein stationäres Störgeräusch handelt. Dazu wird das Eingangssignal E hinsichtlich dessen zeitlicher Entwicklung untersucht, zur Ermittlung einer Stationarität. Dabei werden insbesondere die Intensitäts- und Frequenzstabilität in einem oder mehreren Frequenzbereichen statistisch untersucht und beispielsweise Varianzen bestimmter Pegel oder Frequenzen im Frequenzspektrum des Eingangssignals E ermittelt. Diese Varianzen werden dann auf einen Skalierungsfaktor S3 abgebildet, um weiteren Einfluss auf den Verstärkungsfaktor V auszuüben.The stationarity detector 24 additionally determines to what extent the noise is actually a stationary noise. For this purpose, the input signal E is examined with respect to its temporal evolution, to determine a stationarity. In particular, the intensity and frequency stability in one or more frequency ranges are statistically investigated and, for example, variances of specific levels or frequencies in the frequency spectrum of the input signal E are determined. These variances are then mapped to a scaling factor S3 to exert further influence on the gain factor V.

Auf diese Weise wird mittels der Module 20, 22, 24 der Verstärkungsfaktor V in Abhängigkeit der akustischen Gesamtsituation um den Anwender herum eingestellt. Dabei erfolgt eine Einstellung in Abhängigkeit der Sprechaktivität des Anwenders durch die OVD-Einheit 20 und eine Einstellung in Abhängigkeit eines stationären Störgeräusches durch die Module 22, 24. Dabei ist es mittels der Module 22, 24 möglich, negative Effekte beim Anpassen des Verstärkungsfaktors V durch die OVD-Einheit zu kompensieren oder zumindest zu reduzieren.In this way, by means of the modules 20, 22, 24, the amplification factor V is adjusted as a function of the overall acoustic situation around the user. In this case, an adjustment is made as a function of the speech activity of the user by the OVD unit 20 and a setting in response to a stationary noise by the modules 22, 24. It is possible by means of the modules 22, 24, negative effects in adjusting the gain V through compensate or at least reduce the OVD unit.

Claims (14)

  1. Method for operating a hearing aid (2), in which
    - an input signal (E) is generated by means of a microphone (6),
    - the input signal (E) is amplified in an amplifier (10) with an adjustable gain factor (V),
    - the amplified input signal (B) is output by way of a receiver (12),
    - an OVD parameter is established as a first parameter by means of an OVD unit (20), wherein the OVD parameter specifies whether or not the user themselves is speaking,
    - the gain factor (V) is adjusted in a manner dependent on the OVD parameter taking into account noise,
    - the adjustment of the gain factor in a manner dependent on the OVD parameter itself is dependent on the presence and/or the properties of the noise,
    - the adjustment of the gain factor (V) is modified in a manner dependent on the OVD parameter by virtue of the gain factor (V) additionally being adjusted in a manner dependent on the noise, by virtue of that adjustment of the gain factor which is carried out in a manner dependent on the OVD parameter being modified in a manner dependent on the noise.
  2. Method according to the preceding claim,
    characterized in that
    the gain factor (V) is adjusted within a value range, as a result of which a dynamic gain adaptation is realized within the value range in own voice situations, and
    in that the gain factor (V) is adjusted in a manner dependent on the noise by virtue of the value range of the gain adaptation being reduced so as to reduce a modulation of the noise due to the gain adaptation.
  3. Method according to one of the preceding claims,
    characterized in that the noise is stationary noise.
  4. Method according to one of the preceding claims,
    characterized in that an intensity of the noise is established as a second parameter by means of a noise estimator (22) and the gain factor (V) is adjusted in a manner dependent on the intensity.
  5. Method according to the preceding claim,
    characterized in that a higher gain factor is adjusted in the case of speech activity by the user in the case of a higher established intensity than in the case of a comparatively lower intensity and a lower gain factor is adjusted in the case of a lower established intensity than in the case of a comparatively higher intensity.
  6. Method according to one of the two preceding claims,
    characterized in that a method which only takes into account stationary components of noise is used to establish the intensity.
  7. Method according to one of Claims 4 to 6,
    characterized in that the intensity of the noise is established by means of a minimum statistics method.
  8. Method according to one of the preceding claims,
    characterized in that stationarity of the noise is established as a third parameter by means of a stationarity detector (24) and the gain factor (V) is adjusted in a manner dependent on the stationarity.
  9. Method according to the preceding claim,
    characterized in that the stationarity is established by virtue of a frequency stability and/or intensity stability of the noise being established.
  10. Method according to one of the preceding claims and at least either of claims 4 and 7,
    characterized in that the parameters are each mapped onto a scaling factor (S1, S2, S3) and the gain factor (V) is adjusted by multiplication by the scaling factors (S1, S2, S3).
  11. Method according to the preceding claim,
    characterized in that the scaling factors (S1, S2, S3) are initially combined to form an overall scaling factor (G) and the gain factor (V) is adjusted by multiplication by the overall scaling factor (G).
  12. Method according to one of the preceding claims,
    characterized in that the gain factor (V) is adjusted in a frequency-dependent manner.
  13. Method according to the preceding claim,
    characterized in that an independent adjustment of the gain factor (V) is undertaken in each case in different frequency ranges of the input signal (E).
  14. Hearing aid (2), operable by means of a method according to one of the preceding claims, comprising a microphone (6) for generating an input signal (E), comprising an amplifier (10) for amplifying the input signal (E) by a specific gain factor (V), comprising a receiver (12) for outputting the amplified input signal (E), and comprising a control unit (8), embodied in such a way that
    - an OVD parameter is established as a first parameter by means of an OVD unit(20), wherein the OVD parameter specifies whether or not the user themselves is speaking,
    - the gain factor (V) is adjusted in a manner dependent on the OVD parameter taking into account noise,
    - the adjustment of the gain factor in a manner dependent on the OVD parameter itself is dependent on the presence and/or the properties of a noise, and
    - the gain factor (V) is additionally adjusted in a manner dependent on the noise, by virtue of that adjustment of the gain factor which is carried out in a manner dependent on the OVD parameter being modified in a manner dependent on the noise.
EP16158247.3A 2015-03-13 2016-03-02 Method for operating a hearing device and hearing device Revoked EP3068146B1 (en)

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WO2021089108A1 (en) * 2019-11-04 2021-05-14 Sivantos Pte. Ltd. Method for operating a hearing system, and hearing system
DE102018216667B3 (en) 2018-09-27 2020-01-16 Sivantos Pte. Ltd. Process for processing microphone signals in a hearing system and hearing system
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DE102019214220A1 (en) * 2019-09-18 2021-03-18 Sivantos Pte. Ltd. Method for operating a hearing aid and hearing aid
KR102612709B1 (en) 2019-10-10 2023-12-12 썬전 샥 컴퍼니 리미티드 audio equipment
CN111243616A (en) * 2020-01-09 2020-06-05 广西民族大学 Constant volume output method based on automatic gain
DE102020201615B3 (en) 2020-02-10 2021-08-12 Sivantos Pte. Ltd. Hearing system with at least one hearing instrument worn in or on the user's ear and a method for operating such a hearing system
CN113132881B (en) * 2021-04-16 2022-07-19 深圳木芯科技有限公司 Method for adaptively controlling sound amplification degree of wearer based on multiple microphones

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JP6109985B2 (en) 2017-04-05
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US20160269834A1 (en) 2016-09-15
US9973861B2 (en) 2018-05-15

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