EP2034769A2 - Frequency transformation by means of non-linear processes in the cochlea - Google Patents
Frequency transformation by means of non-linear processes in the cochlea Download PDFInfo
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- EP2034769A2 EP2034769A2 EP08105071A EP08105071A EP2034769A2 EP 2034769 A2 EP2034769 A2 EP 2034769A2 EP 08105071 A EP08105071 A EP 08105071A EP 08105071 A EP08105071 A EP 08105071A EP 2034769 A2 EP2034769 A2 EP 2034769A2
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- hearing aid
- hearing
- tone
- frequency
- tone generator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
- H04R25/353—Frequency, e.g. frequency shift or compression
Definitions
- the present invention relates to a hearing aid and an associated method for operating a hearing device.
- Hearing loss or hearing loss may be due to different causes and accordingly requires a hearing aid, which is adapted or adapted to the particular cause of hearing loss or hearing loss.
- a common problem that afflicts many people with hearing loss is high-frequency loss. This high tone loss is physiological.
- the so-called hair cells convert mechanical vibrations (sound) into electrical energy, which can then be passed on as a nerve impulse.
- this process is disturbed, due to the fact that in the areas in which higher frequencies are converted, only a few or no more hair cells are left. This sometimes leads to so-called dead zones, ie frequency ranges in which no mechanical energy can be transformed into electrical energy.
- the present invention is based on that no signal processing is used to perform the transformation, but that this transformation takes place by physiological processes in the inner ear itself.
- the object of the invention is achieved by a hearing aid according to claim 1 and a method for operating a hearing aid according to claim 6. Further developments of the present invention are described in the subclaims.
- the hearing aid according to the invention has an electro-acoustic output transducer, and is characterized in that the hearing aid has a tone generator for generating a continuous tone with a constant frequency.
- This tone generator can output the continuous tone via the electro-acoustic output transducer, eg a micro-speaker.
- the tone generator preferably comprises a switching element which generates electrical voltages with a characteristic time profile, whereby a continuous tone can be generated. This can be a sine wave generator, but it can also be generated voltages with other time profile, such as sawtooth, etc.
- high frequency frequencies can be transformed into audible ranges in the inner ear via nonlinear transformation processes.
- the hearing aid preferably comprises an electroacoustic input transducer, e.g. a microphone, and an amplifier device, so that also recorded sound signals can be amplified.
- an electroacoustic input transducer e.g. a microphone
- an amplifier device so that also recorded sound signals can be amplified.
- the tone generator is selectively activatable, so that the hearing aid wearer can use the tone generator only in certain listening situations, e.g. in talks.
- the tone generator may be e.g. be activated via a switching element on the hearing aid, or preferably via a remote control, which can carry the hearing aid with it to selectively activate the continuous tone generator.
- the method according to the invention for operating a hearing device is characterized in that at least in phases a continuous tone with a constant frequency is generated and conducted into the inner ear of the wearer.
- outside scarf signals may preferably also be amplified during operation.
- the continuous tone with a constant frequency is preferably in a range of 2 - 10 kHz, 2 - 6 kHz, 2 - 4 kHz, 4 - 10 kHz or 4 - 6 kHz. According to one embodiment of the invention, several continuous tones with different frequencies can be generated. Thus, an adaptation to the individual needs of the hearing aid wearer is made possible.
- This function can be used for a frequency transformation in which a high tone is offered, which can not be perceived by the hearing impaired person himself, since this falls within a frequency range in which the hearing impairment is very pronounced.
- this additional high tone together with the input signal (the sound coming from outside or possibly the sound amplified by the hearing aid) through the use of the non-linear processes in the inner ear corresponding difference tones, so that the input signal is transformed into a low frequency range , in which there are still inner hair cells that can pass on the information to the higher nerves.
- the outstanding feature of this distortion is that its volume is only 20 to 30 dB below the volume of the main frequencies.
- the cubic distortion produces a series of simple tones in the low frequency range. Is e.g.
- a tone generator may be provided in the hearing aid according to the invention, which can simultaneously give up several continuous tones with a constant sequence, in order to expand the spectrum of difference tones accordingly.
- the described solution is characterized on the one hand by the fact that it works much simpler than conventional methods, since only a sound must be generated, which generates the difference tones by the physiology of the inner ear.
- the device can be adapted to the hearing loss of the hearing impaired, and the input signal can be selectively shifted into the frequency ranges in which still functioning hair cells are present.
- the tone generator of the hearing device according to the invention is designed such that the frequency of the continuous tone to be generated can be adjusted. In this way, e.g. As the high-treble loss progresses, the hearing aid is continuously adjusted to the hearing aid wearer.
- the hearing aid Since the difference signal generated in the volume is slightly below the input signal, it is preferred that the hearing aid also has an amplifier device to amplify sound signals coming from the outside, so that a correspondingly adjusted stronger difference signal can be generated in the inner ear.
- FIG. 1 is a profile of a high-tone loss is shown, in which the person concerned in a range from 2 kHz upwards can no longer perceive sound signals (so-called dead zone). For example, signals from the hatched area of 2 to 3 kHz can no longer be perceived.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Hörgerät und ein zugehöriges Verfahren zum Betrieb eines Hörgeräts.The present invention relates to a hearing aid and an associated method for operating a hearing device.
Schwerhörigkeit oder Hörverlust kann durch unterschiedliche Ursachen bedingt sein und erfordert dementsprechend ein Hörgerät, welches auf die jeweilige Ursache des Hörverlusts oder der Schwerhörigkeit abgestimmt bzw. angepasst ist. Ein weit verbreitetes Problem, unter welchem viele Schwerhörige leiden, ist der Hochtonverlust. Dieser Hochtonverlust ist physiologisch bedingt. In der Cochlea werden durch die sog. Haarzellen mechanische Schwingungen (Schall) in elektrische Energie umgewandelt, welche dann als Nervenimpuls weiter gegeben werden kann. Bei Hochtonverlust ist dieser Vorgang gestört, dadurch bedingt, dass in den Bereichen, in welchen höhere Frequenzen gewandelt werden, nur noch wenige oder gar keine Haarzellen mehr vorhanden sind. Dies führt mitunter zu sog. Dead-Zones, also Frequenzbereiche, in denen gar keine mechanische Energie mehr in elektrische Energie transformiert werden kann.Hearing loss or hearing loss may be due to different causes and accordingly requires a hearing aid, which is adapted or adapted to the particular cause of hearing loss or hearing loss. A common problem that afflicts many people with hearing loss is high-frequency loss. This high tone loss is physiological. In the cochlea, the so-called hair cells convert mechanical vibrations (sound) into electrical energy, which can then be passed on as a nerve impulse. In the case of high-tone loss, this process is disturbed, due to the fact that in the areas in which higher frequencies are converted, only a few or no more hair cells are left. This sometimes leads to so-called dead zones, ie frequency ranges in which no mechanical energy can be transformed into electrical energy.
Es ist problematisch, Schwerhörige mit einem derartigen Hörverlust mit Hörgeräten zu versorgen, da auch eine Verstärkung des Schallsignals in diesen Frequenzbereichen nicht mehr weiter hilft. Daher wird versucht, die betroffenen Frequenzbereiche so zu transformieren, dass diese Frequenzbereiche in einen tieferen Frequenzbereich transponiert werden, in welchem noch Haarzellen für eine Übertragung zur Verfügung stehen. In bisherigen Ansätzen wurde dieses Problem technisch, d.h. mittels Signalverarbeitung gelöst. Entsprechende Hörgeräte weisen eine Signalverarbeitungseinrichtung auf, welche Schallwellen mit einem Wandler (Mikrofon) in ein elektrisches Signal verwandelt, dieses Signal rechentechnisch in einen anderen Frequenzbereich transponiert, und als tieferes Signal wieder ausgibt. Dadurch werden mittels Signalverarbeitung die hochfrequenten Anteile des Eingangssignals in einen tief frequenten Bereich verlagert, um so die noch aktiven Bereiche der Basilamembran bzw. der Haarzellen anzusprechen. Bisherige Versuche waren jedoch nicht besonders erfolgversprechend.It is problematic to provide hearing-impaired people with such a hearing loss, since amplification of the sound signal in these frequency ranges also no longer helps. Therefore, an attempt is made to transform the affected frequency ranges so that these frequency ranges are transposed to a lower frequency range in which hair cells are still available for transmission. In previous approaches, this problem was solved technically, ie by means of signal processing. Corresponding hearing aids have a signal processing device which converts sound waves with a transducer (microphone) into an electrical signal, this signal computationally into another Frequency range transposed, and outputs as a lower signal again. As a result, by means of signal processing, the high-frequency components of the input signal are shifted into a low-frequency range so as to address the still active regions of the basilar membrane or of the hair cells. However, previous attempts were not particularly promising.
Es ist daher die Aufgabe der vorliegenden Erfindung, ein Hörgerät und ein Verfahren zum Betrieb eines Hörgeräts bereitzustellen, welches eine verbesserte Versorgung von Hörgerätträgern bevorzugt mit Hochtonverlust ermöglicht.It is therefore the object of the present invention to provide a hearing aid and a method for operating a hearing device, which enables an improved supply of hearing aid wearers, preferably with high-tone loss.
Die vorliegende Erfindung basiert darauf, dass keine Signalverarbeitung zur Durchführung der Transformation verwendet wird, sondern dass diese Transformation durch physiologische Prozesse im Innenohr selber stattfindet.The present invention is based on that no signal processing is used to perform the transformation, but that this transformation takes place by physiological processes in the inner ear itself.
Die erfindungsgemäße Aufgabe wird gelöst durch ein Hörgerät gemäß Patentanspruch 1 und ein Verfahren zum Betrieb eines Hörgeräts gemäß Patentanspruch 6. Weiterbildungen der vorliegenden Erfindung sind in den Unteransprüchen beschrieben.The object of the invention is achieved by a hearing aid according to claim 1 and a method for operating a hearing aid according to claim 6. Further developments of the present invention are described in the subclaims.
Das erfindungsgemäße Hörgerät weist einen elektro-akustischen Ausgangswandler auf, und ist dadurch gekennzeichnet, dass das Hörgerät einen Tongenerator zur Erzeugung eines Dauertons mit konstanter Frequenz aufweist. Dieser Tongenerator kann den Dauerton über den elektro-akustischen Ausgangswandler, z.B. ein Mikrolautsprecher, ausgeben. Der Tongenerator umfasst dabei bevorzugt ein Schaltelement, welches elektrische Spannungen mit einem charakteristischen Zeitverlauf erzeugt, wodurch ein Dauerton erzeugt werden kann. Dies kann ein Sinus-Wellen-Generator sein, es können aber auch Spannungen mit anderen Zeitverlaufsprofil erzeugt werden, z.B. Sägezahn, etc.The hearing aid according to the invention has an electro-acoustic output transducer, and is characterized in that the hearing aid has a tone generator for generating a continuous tone with a constant frequency. This tone generator can output the continuous tone via the electro-acoustic output transducer, eg a micro-speaker. The tone generator preferably comprises a switching element which generates electrical voltages with a characteristic time profile, whereby a continuous tone can be generated. This can be a sine wave generator, but it can also be generated voltages with other time profile, such as sawtooth, etc.
Durch Erzeugen des Dauertons können im Innenohr über nichtlineare Transformationsprozesse Hochtonfrequenzen in hörbare Bereiche transformiert werden.By generating the continuous tone, high frequency frequencies can be transformed into audible ranges in the inner ear via nonlinear transformation processes.
Ferner umfasst das Hörgerät bevorzugt einen elektroakustischen Eingangswandler, z.B. ein Mikrofon, und eine Verstärkereinrichtung, so dass ebenfalls aufgenommene Schallsignale verstärkt werden können.Furthermore, the hearing aid preferably comprises an electroacoustic input transducer, e.g. a microphone, and an amplifier device, so that also recorded sound signals can be amplified.
Bevorzugt ist der Tongenerator selektiv aktivierbar, so dass der Hörgerätträger den Tongenerator nur in bestimmten Hörsituationen nutzen kann, z.B. bei Gesprächen. Dabei kann der Tongenerator z.B. über ein Schaltelement am Hörgerät aktiviert werden, oder bevorzugt über eine Fernsteuerung, welche der Hörgerätträger mit sich führen kann, um damit selektiv den Dauertongenerator zu aktivieren.Preferably, the tone generator is selectively activatable, so that the hearing aid wearer can use the tone generator only in certain listening situations, e.g. in talks. The tone generator may be e.g. be activated via a switching element on the hearing aid, or preferably via a remote control, which can carry the hearing aid with it to selectively activate the continuous tone generator.
Das erfindungsgemäße Verfahren zum Betrieb eines Hörgeräts ist dadurch gekennzeichnet, dass zumindest phasenweise ein Dauerton mit konstanter Frequenz erzeugt und in das Innenohr des Trägers geleitet wird.The method according to the invention for operating a hearing device is characterized in that at least in phases a continuous tone with a constant frequency is generated and conducted into the inner ear of the wearer.
Ferner können bevorzugt während des Betriebs von außen kommende Schalsignale ebenfalls noch verstärkt werden.Furthermore, during the operation, outside scarf signals may preferably also be amplified during operation.
Bevorzugt ist der Dauerton mit konstanter Frequenz in einem Bereich von 2 - 10 kHz, 2 - 6 kHz, 2 - 4 kHz, 4 - 10 kHz oder 4 - 6 kHz. Gemäß einer Weiterbildung der Erfindung können auch mehrere Dauertöne mit unterschiedlichen Frequenzen erzeugt werden. So wird eine Anpassung auf die individuellen Bedürfnisse des Hörgerätträgers ermöglicht.The continuous tone with a constant frequency is preferably in a range of 2 - 10 kHz, 2 - 6 kHz, 2 - 4 kHz, 4 - 10 kHz or 4 - 6 kHz. According to one embodiment of the invention, several continuous tones with different frequencies can be generated. Thus, an adaptation to the individual needs of the hearing aid wearer is made possible.
Im Ohr werden bei Erzeugung des Dauertons aufgrund nicht linearer Prozesse Verzehrungen erzeugt, bei denen zusätzliche Frequenzkomponenten erzeugt werden. Bei den im Folgenden beschriebenen Verzerrungen handelt es sich um Intermodulationsverzerrungen, durch die sog. Differenztöne erzeugt werden.In the ear, when the continuous tone is generated due to non-linear processes, consumptions are generated in which additional frequency components are generated. The distortions described below are intermodulation distortions that produce so-called difference tones.
Diese Funktion kann man sich für eine Frequenztransformation zu nutze machen, in dem ein hoher Ton angeboten wird, der vom Hörgeschädigten selber nicht mehr wahrgenommen werden kann, da dieser in einen Frequenzbereich fällt, in dem die Hörstörung sehr stark ausgeprägt ist. Nun bildet dieser zusätzliche hohe Ton zusammen mit dem Eingangssignal (dem von außen kommenden Schall oder ggf. dem durch das Hörgerät noch verstärkten Schall) durch die Ausnutzung der nicht linearen Prozesse im inneren Ohr entsprechende Differenztöne, so dass das Eingangssignal in einen niedrigen Frequenzbereich transformiert wird, in der noch innere Haarzellen vorhanden sind, die die Information an die höher Nerven weiterleiten können.This function can be used for a frequency transformation in which a high tone is offered, which can not be perceived by the hearing impaired person himself, since this falls within a frequency range in which the hearing impairment is very pronounced. Now, this additional high tone together with the input signal (the sound coming from outside or possibly the sound amplified by the hearing aid) through the use of the non-linear processes in the inner ear corresponding difference tones, so that the input signal is transformed into a low frequency range , in which there are still inner hair cells that can pass on the information to the higher nerves.
Hierbei ist insbesondere die kubische Verzerrung von großer Bedeutung. Aus zwei gegebenen Hauptfrequenzen F1 und F2 berechnet sich die Verzerrungsfrequenz oder Differenzfrequenz FD = 2 x F1 - F2. Wenn beispielsweise ein Eingangssignal mit einer Komponente F1 = 1000 Hz und der vom Hörgerät erzeugte Dauerton mit konstanter Frequenz F2 = 1200 Hz vorliegt, dann entsteht im Ohr ein Differenzton von 800 Hz. Das herausragende dieser Verzerrung ist, dass sie in ihrer Lautstärke lediglich 20 bis 30 dB unter der Lautstärke der Hauptfrequenzen liegt. Damit erzeugt die kubische Verzerrung eine Reihe von einfachen Tönen im Bereich der niedrigen Frequenzen. Ist z.B. eine komplexe Wellenform durch F1 = 1000 Hz, F2 = 1200 Hz, F3= 1400 Hz und F4 = 1600 Hz gegeben, existiert ebenso ein 800 Hz Komponente aus 2 x F1 - F2, eine 600 Hz Komponente aus 2 x F1 - F3 und eine 1000 Hz Komponente aus 2 x F2 - F3.In particular, the cubic distortion is of great importance. From two given main frequencies F1 and F2, the distortion frequency or difference frequency FD = 2 × F1-F2 is calculated. If, for example, there is an input signal with a component F1 = 1000 Hz and the constant tone generated by the hearing aid at a constant frequency F2 = 1200 Hz, then a difference tone of 800 Hz results in the ear. The outstanding feature of this distortion is that its volume is only 20 to 30 dB below the volume of the main frequencies. Thus, the cubic distortion produces a series of simple tones in the low frequency range. Is e.g. Given a complex waveform represented by F1 = 1000 Hz, F2 = 1200 Hz, F3 = 1400 Hz and F4 = 1600 Hz, there is also an 800 Hz component of 2 x F1 - F2, a 600 Hz component of 2 x F1 - F3 and a 1000 Hz component from 2 x F2 - F3.
Dementsprechend kann auch ein Tongenerator in dem erfindungsgemäßen Hörgerät vorgesehen sein, welcher gleichzeitig mehrere Dauertöne mit konstanter Sequenz aufgeben kann, um entsprechend das Spektrum von Differenztönen zu erweitern.Accordingly, a tone generator may be provided in the hearing aid according to the invention, which can simultaneously give up several continuous tones with a constant sequence, in order to expand the spectrum of difference tones accordingly.
Die beschriebene Lösung zeichnet sich zum einen dadurch aus, dass sie wesentlich einfacher als herkömmliche Verfahren funktioniert, da lediglich ein Ton erzeugt werden muss, der durch die Physiologie des Innenohrs die Differenztöne erzeugt. Zusätzlich kann durch die Variation dieser Frequenz dieses zusätzlichen Tones das Gerät auf den Hörverlust des Schwerhörigen angepasst werden, und das Eingangssignal gezielt in die Frequenzbereiche verschoben werden, in der noch funktionierende Haarzellen vorhanden sind. Dementsprechend ist es bevorzugt, dass der Tongenerator des erfindungsgemäßen Hörgeräts derart ausgestaltet ist, dass sich die Frequenz des zu erzeugenden Dauertons einstellen lässt. Auf diese Weise kann, z.B. bei fortschreitendem Hochtonverlust, das Hörgerät kontinuierlich auf den Hörgerätträger angepasst werden.The described solution is characterized on the one hand by the fact that it works much simpler than conventional methods, since only a sound must be generated, which generates the difference tones by the physiology of the inner ear. In addition, by varying this frequency of this additional tone, the device can be adapted to the hearing loss of the hearing impaired, and the input signal can be selectively shifted into the frequency ranges in which still functioning hair cells are present. Accordingly, it is preferred that the tone generator of the hearing device according to the invention is designed such that the frequency of the continuous tone to be generated can be adjusted. In this way, e.g. As the high-treble loss progresses, the hearing aid is continuously adjusted to the hearing aid wearer.
Da das erzeugte Differenzsignal in der Lautstärke etwas unter dem Eingangssignal liegt, ist es bevorzugt, dass das Hörgerät ebenfalls eine Verstärkereinrichtung aufweist, um von außen kommende Schallsignale zu verstärken, so dass im Innenohr ein entsprechend angepasstes stärkeres Differenzsignal erzeugt werden kann.Since the difference signal generated in the volume is slightly below the input signal, it is preferred that the hearing aid also has an amplifier device to amplify sound signals coming from the outside, so that a correspondingly adjusted stronger difference signal can be generated in the inner ear.
Es wird auf die angehängten Figuren verwiesen, in welchen zeigen:
- FIG 1
- eine schematische Darstellung in graphischer Form eines Hochtonverlusts mit einer Dead-Zone oberhalb von 2 kHz; und
- FIG 2
- eine schematische Darstellung in graphischer Form der Transformation von Signalen aus einem nicht hörbaren Bereich in einen hörbaren Bereich durch kubische Verzerrung.
- FIG. 1
- a schematic representation in graphical form of a Hochtonverlusts with a dead zone above 2 kHz; and
- FIG. 2
- a schematic representation in graphical form of the transformation of signals from a non-audible range in an audible range by cubic distortion.
In
Nun wird, wie in
Auf diese Weise wird eine Transformation der Signale durch lineare Prozesse im Innenohr des Hörgerätträgers erreicht. Bevorzugt weist das Hörgerät zusätzlich eine Verstärkereinrichtung auf, welche das Eingangssignal entsprechend verstärken kann, so dass das erzeugte Differenzsignal für den Hörgerätträger gut hörbar ist. Dabei ist es bevorzugt, dass das Hörgerät eine Signalverarbeitungseinrichtung aufweist, welche eine frequenzspezifische Verstärkung ermöglicht, so dass Frequenzen in bestimmten Bereichen stärker verstärkt werden können, als in anderen Bereichen. Ganz besonders bevorzugt weist das Hörgerät eine digitale Signalverarbeitungseinrichtung auf, welche z.B. von einem Hörgeräte-Akustiker rechnergestützt über eine Software programmiert und auf den Hörgerätträger angepasst werden kann.In this way, a transformation of the signals by linear processes in the inner ear of the hearing aid wearer is achieved. Preferably, the hearing device additionally has an amplifier device, which can amplify the input signal accordingly, so that the generated difference signal for the hearing aid wearer is well audible. In this case, it is preferred that the hearing device has a signal processing device which enables a frequency-specific amplification, so that frequencies in certain areas can be amplified more strongly than in other areas. Most preferably, the hearing aid has a digital signal processing device, which, e.g. computer-aided by a hearing aid acoustician computer-aided and can be adapted to the hearing aid wearer.
Claims (6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007042106A DE102007042106A1 (en) | 2007-09-05 | 2007-09-05 | Frequency transformation by nonlinear processes in the cochlea |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2034769A2 true EP2034769A2 (en) | 2009-03-11 |
| EP2034769A3 EP2034769A3 (en) | 2013-04-17 |
Family
ID=40090346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08105071.8A Withdrawn EP2034769A3 (en) | 2007-09-05 | 2008-08-19 | Frequency transformation by means of non-linear processes in the cochlea |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20090060239A1 (en) |
| EP (1) | EP2034769A3 (en) |
| DE (1) | DE102007042106A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012041372A1 (en) * | 2010-09-29 | 2012-04-05 | Siemens Medical Instruments Pte. Ltd. | Method for frequency compression, adjustment device and hearing device |
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| US5167236A (en) * | 1988-12-22 | 1992-12-01 | Franz Junker | Tinnitus-masker |
| EP0820211A1 (en) * | 1996-07-09 | 1998-01-21 | Siemens Audiologische Technik GmbH | Programmable hearing aid |
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| DE102006016440A1 (en) * | 2006-04-07 | 2007-10-11 | Siemens Audiologische Technik Gmbh | hearing Aid |
-
2007
- 2007-09-05 DE DE102007042106A patent/DE102007042106A1/en not_active Withdrawn
-
2008
- 2008-08-19 EP EP08105071.8A patent/EP2034769A3/en not_active Withdrawn
- 2008-09-02 US US12/231,415 patent/US20090060239A1/en not_active Abandoned
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| US5167236A (en) * | 1988-12-22 | 1992-12-01 | Franz Junker | Tinnitus-masker |
| EP0820211A1 (en) * | 1996-07-09 | 1998-01-21 | Siemens Audiologische Technik GmbH | Programmable hearing aid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012041372A1 (en) * | 2010-09-29 | 2012-04-05 | Siemens Medical Instruments Pte. Ltd. | Method for frequency compression, adjustment device and hearing device |
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| Publication number | Publication date |
|---|---|
| US20090060239A1 (en) | 2009-03-05 |
| DE102007042106A1 (en) | 2009-03-26 |
| EP2034769A3 (en) | 2013-04-17 |
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