EP1503612B1 - Prothèse auditive et méthode à l'opération d'une prothèse auditive avec un système de microphone dans lequel de différentes caractéristiques directionnelles sont sélectionnables - Google Patents

Prothèse auditive et méthode à l'opération d'une prothèse auditive avec un système de microphone dans lequel de différentes caractéristiques directionnelles sont sélectionnables Download PDF

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Publication number
EP1503612B1
EP1503612B1 EP04014898A EP04014898A EP1503612B1 EP 1503612 B1 EP1503612 B1 EP 1503612B1 EP 04014898 A EP04014898 A EP 04014898A EP 04014898 A EP04014898 A EP 04014898A EP 1503612 B1 EP1503612 B1 EP 1503612B1
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EP
European Patent Office
Prior art keywords
microphone
microphones
microphone unit
unit
hearing aid
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Revoked
Application number
EP04014898A
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German (de)
English (en)
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EP1503612A3 (fr
EP1503612A2 (fr
Inventor
Tom Weidner
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Sivantos GmbH
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Siemens Audioligische Technik GmbH
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Application filed by Siemens Audioligische Technik GmbH filed Critical Siemens Audioligische Technik GmbH
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Publication of EP1503612A3 publication Critical patent/EP1503612A3/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers
    • 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
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers

Definitions

  • the invention relates to a hearing aid as well as a method for operating a hearing aid with at least three microphones, which are electrically interconnected to form a directional microphone system.
  • the transmission parameters of the hearing aid are automatically varied.
  • the classification can have an influence on the mode of operation of noise suppression algorithms as well as on the microphone system. For example, depending on the detected hearing situation selected (discretely switched or continuously faded) between an omnidirectional directional characteristic (directional characteristic of zero order) and a clear directivity of the microphone system (directivity of the first or higher order).
  • To generate the directional characteristic gradient microphones are used or interconnected several omnidirectional microphones with each other.
  • Such microphone systems show a frequency-dependent transmission behavior, in which a significant drop to low frequencies is recorded.
  • the noise behavior of the microphones is independent of frequency and slightly amplified compared to an omnidirectional microphone.
  • the high-pass frequency response of the microphone system must be balanced by amplifying the low frequencies.
  • the noise in the low frequency range is also amplified and, under certain circumstances, clearly and disturbingly audible, while quiet noises are obscured by the noise.
  • a hearing aid is known with a signal processing unit and at least two microphones, which are interconnected to form directional microphone systems of different order, the directional microphone systems in turn are interconnected in dependent on the frequency of the votes of the microphones microphone signals weighting.
  • the cut-off frequency between adjacent frequency bands, in which a different weighting of the microphone signals is provided can be set.
  • From the EP 0 942 627 A2 is a hearing aid with directional microphone system with a signal processing device, a handset and a plurality of microphones known whose output signals for generating an individual directional microphone characteristic via delay means and the signal processing means in different weighting are interconnected.
  • the preferred direction of reception (main direction) can be set individually in adaptation to a present hearing situation.
  • the microphone signal of the directional microphone is amplified in the region of low signal frequencies in amplitude and matched to the microphone signal of the omnidirectional microphone.
  • Both the microphone signal of the omnidirectional microphone and the microphone signal of the directional microphone are supplied to a switching unit. In a first switching position of the switching unit, the omnidirectional microphone and in a second switching position of the switching unit, the directional microphone is connected to a hearing aid amplifier.
  • the switching unit can automatically switch depending on the signal level of a microphone signal.
  • a disadvantage of the known hearing aid devices with a directional microphone system is that in certain listening situations either the directivity of the microphone system is not optimally used or that a high degree of directivity leads to a clearly audible deterioration of the sound quality.
  • Object of the present invention is to improve the sound quality of a hearing aid with directional microphone system.
  • a hearing aid with at least three microphones, which are electrically interconnected to form a directional microphone system, characterized in that at least two microphones are connected to a first microphone unit with a directional characteristic of a particular order and that at least two microphones to a second microphone unit with a directional characteristic of the same order are connected, wherein the two microphone units are connected to form a third microphone unit with a directional characteristic of the same order.
  • the object in a method for operating a hearing aid with at least three microphones, which are electrically interconnected to form a directional microphone system achieved in that at least two microphones are connected to a first microphone unit with a directional characteristic of a particular order and that at least two microphones are connected to a second microphone unit with a directional characteristic of the same order, wherein the two microphone units are electrically interconnected to form a third microphone unit having a directional characteristic of the same order.
  • the hearing aid according to the invention comprises a microphone system with at least three microphones in order to realize directional characteristics zeroth to second order. However, there may be more than three microphones, so that directional characteristics of higher order are possible.
  • the hearing aid device comprises a signal processing unit for processing and frequency-dependent amplification of the microphone signal generated by the microphone system.
  • the signal output is usually carried out by an acoustic output signal by means of a handset. But there are also other, eg vibration generating output transducer known.
  • a microphone unit with a directional pattern of first order can be realized for example by a single gradient microphone or the electrical interconnection of two omnidirectional microphones.
  • DI directivity index
  • KEMAR a standard research dummy
  • Directional microphones of the second and higher order have DI values of 6 dB and more, which are advantageous for better speech intelligibility, for example. If a hearing aid device contains a microphone system with, for example, three omnidirectional microphones, microphone units with directional characteristics of zeroth to second order can be realized on this basis at the same time by suitable interconnection of the microphones.
  • a single omnidirectional microphone in itself represents a zero-order microphone unit. If two microphone omnidirectional delayed the microphone signal of a microphone, and subtracted from the microphone signal of the other microphone, a first-order microphone unit is created. If, in turn, the microphone signal of a microphone unit is delayed in two microphone units of the first order, and of the microphone signal of the second microphone unit of the first order subtracted, the result is a microphone unit with directivity second order. In this way - depending on the number of omnidirectional microphones - microphone units of any order can be realized.
  • a microphone system comprises microphone units of different order, it is possible to switch between different directional characteristics, e.g. by turning on or off one or more microphones. Furthermore, by means of a suitable electrical connection of the microphone units, it is also possible to produce any desired mixed forms between the directional characteristics of different order. For this purpose, the microphone signals of the microphone units are weighted differently and added before they are further processed and amplified in the signal processing unit of the hearing aid. Thus, a continuous, smooth transition between different directional characteristics can be realized, which can avoid disturbing artifacts when switching.
  • the basic idea of the invention is not to set the maximum possible order of the directivity with the given number of microphones in a directional microphone system with a plurality of microphones, but to form a plurality of microphone units with a lower order than the largest possible order and to provide the microphone signals emanating from these microphone units for further processing.
  • the different microphone units can be optimized for specific frequency ranges, so that after the merging of the microphone units with directional characteristics of the same order outgoing microphone signals a directional microphone of the same order arises, compared to the individual microphone units over a wide or the entire frequency range to be transmitted shows improved signal transmission behavior.
  • a different frequency response of the microphone units may e.g. by a suitable selection of the omnidirectional microphones, which are electrically interconnected to form the microphone unit.
  • two omnidirectional microphones are selected, which are located in a relatively short distance from each other, and in itself for the directivity not the distance of the microphones as such is crucial, but the distance of the sound inlet openings of these microphones.
  • hearing aids with a directional microphone system usually identical microphones are used and also the storage of microphones and the connection of these microphones, each with a sound inlet opening in the housing of the hearing aid is at least essentially the same for all microphones, the distance of the microphones corresponds to Distance of the sound inlets of these microphones.
  • the distance of the sound entry openings in the housing of the hearing aid device is to be understood in the context of the invention under the "distance between two microphones", these being connected in each case via a sound channel to a microphone.
  • a second microphone unit two omnidirectional microphones are interconnected, between which compared to the first microphone unit is a greater distance between the two omnidirectional microphones. Since the signal transmission behavior of a directional microphone constructed from two omnidirectional microphones depends on the distance of the microphones, the two microphone units thus formed differ in their signal transmission behavior, although both microphone units have the same order of directivity (first order in the example). In particular, with the short distance between the two omnidirectional microphones, the microphone unit is better for transmitting high frequencies and the microphone unit having the greater distance between the two omnidirectional ones used Microphones better suited for transmitting low frequencies. If the microphone signals emanating from both microphone units are subsequently combined, the result is a microphone system which exhibits good signal transmission behavior over a wide frequency range. Furthermore, in the microphone system thus formed, the signal-to-noise ratio is improved over a directional microphone, in which the maximum order of the directivity is set with the existing number of microphones.
  • the invention provides significant advantages for the hearing aid wearer.
  • the microphone system generates less noise than a microphone system with the maximum order of the directivity, which is possible with the existing number of microphones.
  • the microphone system shows a high degree of sensitivity over a wide frequency range. The typical for directional microphones existing high-pass effect, which leads to a falsification of the usual sound, can be mitigated.
  • the directivity is improved.
  • the AI-DI of a directional microphone system constructed according to the invention is higher than in a conventional directional microphone system of the same order.
  • a further development of the invention provides for a weighting unit connected downstream of the different microphone units, by means of which the microphone signals emanating from the different microphone units can be weighted differently before the addition.
  • the hearing aid device is, for example, a hearing aid worn behind the ear, a hearing aid that can be worn in the ear, an implantable hearing aid, a pocket hearing device or a hearing aid.
  • the hearing aid according to the invention may also be part of a plurality of devices for supplying a hearing aid comprising comprehensive hearing aid system, e.g. Part of a hearing aid system with two worn on the head hearing aids for binaural care, part of a hearing aid with a head-worn hearing and a portable external processor unit, part of a fully or partially implantable hearing aid system with multiple components or part of a hearing aid system with external auxiliary components such as remote control unit or external microphone unit.
  • FIG. 1 shows a behind the ear portable hearing aid 1, in whose housing three sound inlet openings 2, 3 and 4 are present.
  • the sound incident in the sound entry opening 2 is supplied to an omnidirectional microphone 7, the sound incident on the sound entry opening 3 to an omnidirectional microphone 6 and the sound incident into the sound entry opening 4.
  • the microphones 5-7 each convert an acoustic input signal into an electrical microphone signal, wherein different directional characteristics of the microphone system can be set by means of different electrical connections of the three microphones 5, 6 and 7.
  • the microphone signal resulting from the microphone system is fed to a signal processing unit 8 for further processing and frequency-dependent amplification.
  • the electrical output signal of the signal processing unit 8 is converted by an earphone 9 into an acoustic signal and fed via a sound channel 10 and an adjoining sound tube (not shown) to the hearing of a hearing aid wearer.
  • a battery 11 is provided to power the electrical components of the hearing aid 1.
  • the hearing aid 1 according to the embodiment comprises two operating elements 12 and 13, wherein the key switch 12 is used for program selection and the volume control 13 for adjusting the volume.
  • a hearing aid device 1 with a microphone system In a hearing aid device 1 with a microphone system according to the embodiment directional effects zeroth to second order can be generated. So far, was for an omnidirectional Reception (zero order directivity) only the microphone signal of a microphone, eg the microphone 5, further processed. In order to produce a directivity of first order, two microphones were electrically interconnected, for example, the microphones 5 and 7, and further processed the output of this microphone unit. The output signal of the third microphone (in the example the output signal of the microphone 6) was not used. Preferably, therefore, the microphone 6 is turned off in this mode of the hearing aid 1. Only to produce a second-order directivity, the output signals of all three microphones were used.
  • the microphones 5 and 6 can be connected to a first microphone unit with directivity of the first order by delaying the microphone signal emitted by the microphone 6 and being subtracted from the microphone signal emanating from the microphone 5.
  • the microphone signal emanating from the microphone 7 can be delayed and subtracted from the microphone signal emanating from the microphone 6. This creates a second microphone unit of the first order.
  • a directivity of the second order is obtained, for example, by delaying the microphone signal emanating from the second microphone unit and subtracting it from the microphone signal of the first microphone unit.
  • the three omnidirectional microphones 5, 6 and 7 are now electrically connected to one another in order to form two microphone units with directivity in at least one of several possible modes of operation of the hearing aid device 1.
  • the first microphone unit from the two microphones 5 and 6 and the second microphone unit from the two microphones 5 and 7 are formed.
  • the distance between the two microphones 5 and 6 (or the distance between the sound inlet openings 2 and 3 of the two microphones 5 and 6) of the first microphone unit small in relation to the distance of the two microphones 5 and 7 ( or to the distance of the sound inlet openings 2 and 4 of the microphones. 5 and 7) the second microphone unit.
  • the two microphone signals of the first-order microphone units are not electrically interconnected to form a directional second-order directional microphone, but merely summed, so the directional microphone system thus formed from the microphones 5, 6, and 7 also has only a first-order directional characteristic on, however, considered over the entire transmittable frequency range with an improved signal transmission behavior compared to the individual, each formed from two omnidirectional microphones microphone units.
  • this gain does not have to be paid for by an increased microphone noise, as would be the case with an electrical interconnection of the three omnidirectional microphones 5, 6 and 7 to a directional microphone system with directional characteristics of the second order.
  • the associated, pronounced high-pass characteristic of such a second-order directional microphone system with the associated unfamiliar sound pattern is also avoided by the invention.
  • FIG. 2 shows a simplified block diagram of the directional microphone system of a hearing aid with three omnidirectional microphones 20, 21 and 22, the example as in FIG. 1 illustrated in a hearing aid 1 may be arranged.
  • the three omnidirectional microphones 20, 21 and 22 each have a signal preprocessing unit 23, 24 and 25 connected downstream.
  • the signal preprocessing units 23-25 for example, an A / D conversion, a microphone adjustment to compensate for component tolerances in the microphones, a signal delay, etc.
  • the emanating from the omnidirectional microphone 21 electrical microphone signal is delayed in the signal preprocessing unit 24, inverted and in the adder 26 is added to the output from the omnidirectional microphone 20 electrical microphone signal.
  • the two omnidirectional microphones 20 and 21 form a first microphone unit with directivity of the first order.
  • the electrical microphone signal emanating from the omnidirectional microphone 22 is also delayed in the signal preprocessing unit 25 and inverted and added in an adder 27 to the electrical microphone signal emanating from the omnidirectional microphone 20.
  • the two microphones 20 and 22 thereby form a microphone unit with directivity of the first order.
  • the inversion of a microphone signal and subsequent addition with the respective other microphone signal actually corresponds to a subtraction of the two microphone signals.
  • the two microphone signals emanating from the microphone units with directional characteristics of the first order are each first supplied to a filter unit 28 or 29 and then added to an adder 30.
  • the filter device 28 is designed as a high pass and the filter device 29 as a low pass. Since neither of the two microphone signals at the input of the adder 30 is delayed and inverted, the microphone signal applied to the output of the adder 30 also originates from a microphone system having a directional characteristic of the first order.
  • FIG. 3 An alternative embodiment of the embodiment according to FIG. 2 shows FIG. 3 , Also in this embodiment, three omnidirectional microphones 40, 41 and 42 are interconnected with each other to form a directional microphone system having directivity.
  • the microphones 40, 41 and 42 are each followed by a signal preprocessing unit 43, 44 and 45, respectively.
  • each two microphones arranged next to each other form a first-order microphone unit.
  • the electrical microphone signal emanating from the omnidirectional microphone 41 is delayed in the signal preprocessing unit 44 and inverted and added in an adder 46 to the microphone signal output from the omnidirectional microphone 40.
  • the two omnidirectional microphones 40 and 41 thus form a first microphone unit with directivity of the first order.
  • the microphone signal emanating from the omnidirectional microphone 42 is also delayed in the signal pre-processing unit 45 and inverted and added in an adder 47 to the microphone signal output from the omnidirectional microphone 41.
  • the two microphones 41 and 42 form a microphone unit with directivity of the first order.
  • the not necessarily required filter devices 28 and 29 according to the embodiment according to FIG. 2 corresponding filter devices are in accordance with the embodiment FIG. 3 not provided.
  • a weighting unit 51 is present for different weighting of the microphone signals.
  • FIG. 4 the essential advantage of the invention is illustrated graphically. Shown is a diagram of the signal transmission behavior of two microphone units with directional characteristics of the first order as a function of the signal frequency.
  • the curve A represents the signal transmission behavior of a microphone unit with a relatively large distance between the individual microphones or a relatively large delay time.
  • curve B shows the signal transmission behavior with a small microphone spacing or a small delay time. Both curves have the typical high-pass characteristic of a directional microphone system.
  • a signal transmission behavior according to the curve C results overall, which essentially coincides with the curve A at low frequencies and substantially with the curve B at higher frequencies. Overall, thus results over a relatively wide frequency range, a good signal transmission behavior.
  • the invention is not limited to the embodiments with a directional microphone system with three microphones, but it can be transmitted in an analogous manner to directional microphone systems with more than three microphones.

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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)
  • Circuit For Audible Band Transducer (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Stereophonic Arrangements (AREA)

Claims (10)

  1. Prothèse ( 1 ) auditive comprenant au moins trois microphones ( 5, 6, 7 ; 20, 21, 22 ; 40, 41, 42 ) qui sont connectés électriquement entre eux pour la formation d'un système de microphone directionnel, caractérisée en ce qu'au moins deux microphones ( 5, 6 ; 20, 21 ; 40, 41) sont connectés à une première unité de microphone ayant une caractéristique directionnelle d'un ordre déterminé et en ce qu'au moins deux microphones ( 5, 7 ; 20, 22 ; 41, 42 ) sont connectés à une deuxième unité de microphone ayant une caractéristique directionnelle du même ordre, dans laquelle les deux unités de microphone sont connectées aussi à une troisième unité de microphone ayant une caractéristique directionnelle du même ordre.
  2. Prothèse auditive suivant la revendication 1, caractérisée en ce que la distance entre les deux microphones ( 5, 6 ; 20, 21 ; 40, 41 ) de la première unité de microphone est différente de la distance entre les deux microphones ( 5, 7 ; 20, 22 ) de la deuxième unité de microphone.
  3. Prothèse auditive suivant la revendication 1 ou 2, caractérisée par un premier, un deuxième et un troisième microphones ( 5, 6, 7 ) omnidirectionnels, auquel est associé respectivement une ouverture ( 2, 3, 4 ) d'entrée du son, les ouvertures ( 2, 3, 4 ) d'entrée du son étant disposées au moins à peu près le long d'une droite, le premier et le deuxième microphones ( 5, 6 ) étant connectés à une première unité de microphone ayant une caractéristique directionnelle du premier ordre. Le premier et le troisième microphones ( 5, 7 ) étant connectés à une deuxième unité de microphone ayant une caractéristique directionnelle du premier ordre et les signaux de microphone de la première et de la deuxième unités de microphone étant envoyés à un additionneur ( 30, 50 ) sans retard relatif des signaux de microphone entre eux et sans inversion de l'un des signaux de microphone.
  4. Prothèse auditive suivant l'une des revendications 1 à 3, caractérisée par une première unité ( 28 ) de filtrage montée en aval de la première unité de microphone et par une deuxième unité ( 29 ) de filtrage montée en aval de la deuxième unité de microphone, des fonctions de filtrage différentes pouvant être réalisées par les unités ( 28, 29 ) de filtrage.
  5. Procédé pour faire fonctionner une prothèse ( 1 ) auditive ayant au moins trois microphones ( 5, 6, 7 ; 20, 21, 22 ; 40, 41, 42 ) qui sont connectées électriquement entre eux pour la formation d'un système de microphone directionnel, caractérisé en ce que l'on connecte au moins deux microphones ( 5, 6 ; 20, 21 ; 40, 41 ) à une première unité de microphone ayant une caractéristique directionnelle d'un ordre déterminé et en ce qu'on connecte au moins deux microphones ( 5, 7 ; 20, 22 ; 41, 42 ) à une deuxième unité de microphone ayant une caractéristique directionnelle du même ordre, les deux unités de microphone étant connectées aussi électriquement entre elles pour la formation d'une troisième unité de microphone ayant une caractéristique directionnelle du même ordre.
  6. Procédé pour faire fonctionner une prothèse auditive suivant la revendication 5, caractérisé en ce que l'on retarde respectivement un signal de microphone partant d'un microphone ( 6 ; 21 ; 41 ) de la première unité de microphone et on le soustrait du signal de microphone de l'autre microphone ( 5 ; 20 ; 40 ) de la première unité de microphone et en ce que l'on retarde respectivement un signal de microphone partant d'un microphone ( 7 ; 22 ; 42 ) de la deuxième unité de microphone et on le soustrait du signal de microphone de l'autre microphone ( 5 ; 20 ; 41 ) de la deuxième unité de microphone, le retard effectué dans la première unité de microphone étant différent du retard effectué dans la deuxième unité de microphone.
  7. Procédé pour faire fonctionner une prothèse auditive suivant la revendication 5 ou 6, caractérisé en ce que l'on filtre différemment et additionne des signaux de microphones partant de la première unité de microphone et de la deuxième unité de microphone.
  8. Procédé pour faire fonctionner une prothèse auditive suivant l'une des revendications 5 à 7, caractérisé en ce que l'on pondère différemment et on additionne les signaux partant de la première unité de microphone et de la deuxième unité de microphone.
  9. Procédé pour faire fonctionner une prothèse auditive suivant l'une des revendications 5 à 8, caractérisé en ce que la distance entre les deux microphones ( 5, 6 ; 20, 21 ) de la première unité de microphone est plus petite que la distance entre les deux microphones ( 5, 7 ; 20, 22 ) de la deuxième unité de microphone et en ce que l'on effectue, pour le signal de microphone partant de la première unité de microphone, un filtrage passe haut, et, pour le signal de microphone partant de la deuxième unité de microphone, un filtrage passe bas.
  10. Procédé pour faire fonctionner une prothèse auditive suivant l'une des revendications 6 à 9, caractérisé en ce que le retard effectué pour l'un des deux microphones ( 6 ; 21 ; 41 ) de la première unité de microphone est plus petit que le retard effectué pour l'un des deux microphones ( 7 ; 22 ; 42 ) de la deuxième unité de microphone et en ce que l'on effectue, pour le signal de microphone partant de la première unité de microphone, un filtrage passe haut et, pour le signal de microphone partant de la deuxième unité de microphone, un filtrage passe bas.
EP04014898A 2003-07-28 2004-06-24 Prothèse auditive et méthode à l'opération d'une prothèse auditive avec un système de microphone dans lequel de différentes caractéristiques directionnelles sont sélectionnables Revoked EP1503612B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10334396 2003-07-28
DE10334396A DE10334396B3 (de) 2003-07-28 2003-07-28 Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteristiken einstellbar sind

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EP1503612A2 EP1503612A2 (fr) 2005-02-02
EP1503612A3 EP1503612A3 (fr) 2009-01-21
EP1503612B1 true EP1503612B1 (fr) 2009-08-19

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US (1) US20050058312A1 (fr)
EP (1) EP1503612B1 (fr)
AT (1) ATE440456T1 (fr)
AU (1) AU2004203392B2 (fr)
DE (2) DE10334396B3 (fr)
DK (1) DK1503612T3 (fr)

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DE10331956C5 (de) * 2003-07-16 2010-11-18 Siemens Audiologische Technik Gmbh Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteistiken einstellbar sind

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ATE440456T1 (de) 2009-09-15
EP1503612A3 (fr) 2009-01-21
AU2004203392A1 (en) 2005-02-17
DE502004009913D1 (de) 2009-10-01
DE10334396B3 (de) 2004-10-21
US20050058312A1 (en) 2005-03-17
DK1503612T3 (da) 2009-11-23
EP1503612A2 (fr) 2005-02-02
AU2004203392B2 (en) 2007-01-04

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