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EP2124481B1 - Apparatus for reducing interferences in a wireless data transmission in hearing aid applications - Google Patents

Apparatus for reducing interferences in a wireless data transmission in hearing aid applications Download PDF

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Publication number
EP2124481B1
EP2124481B1 EP09155631.6A EP09155631A EP2124481B1 EP 2124481 B1 EP2124481 B1 EP 2124481B1 EP 09155631 A EP09155631 A EP 09155631A EP 2124481 B1 EP2124481 B1 EP 2124481B1
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EP
European Patent Office
Prior art keywords
interference
hearing device
field
hearing aid
antenna
Prior art date
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EP09155631.6A
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German (de)
French (fr)
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EP2124481A3 (en
EP2124481A2 (en
Inventor
Volker Gebhardt
Peter Nikles
Gottfried Rückerl
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Sivantos Pte Ltd
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Siemens Medical Instruments Pte Ltd
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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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/49—Reducing the effects of electromagnetic noise on the functioning of hearing aids, by, e.g. shielding, signal processing adaptation, selective (de)activation of electronic parts in hearing aid
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/51—Aspects of antennas or their circuitry in or for hearing aids

Definitions

  • ⁇ -metal contains metal alloys of high permeability ⁇ .
  • ferromagnetic shielding For details, for example, in Zimmermann, JE, SQUID Instruments and Shielding for low-level magnetic measurements. J. Appl. Phys .; 48: 702-710, 1977 ,
  • Another known measure is - where possible - a sufficient distance of the transmitting or receiving coil to the source of interference.
  • FIG. 1 is shown schematically the principle of a geometric adjustment between the receiving antenna and functioning as a source of interference hearing aid.
  • the coupling into the antenna is recorded metrologically, the position of the antenna optimized until the minimum coupling is achieved.
  • the position of the antenna with respect to the source of interference is then firmly fixed by suitable measures (adhesive, holder).
  • a hearing aid is disclosed with a line loop to compensate for inductive interference. It is proposed to deliberately lay cable loops with supply lines of the hearing aid device an opposing field for attenuation or compensation of interference fields present at the location of a transmitting and / or receiving antenna is generated in order to attenuate or compensate an electromagnetic interference field generated in the hearing aid itself and act on the transmitting and / or receiving antenna.
  • the publication DE 198 54 201 A1 describes a hearing aid with an induction coil to reduce magnetic interference.
  • a compensation inductance is arranged in a receiver signal line.
  • the compensation inductance generates a compensation field directed against a magnetic field of the induction coil, which acts against a magnetic field of the listener and forms an active shielding of the handset.
  • WO 2005/020549 A1 is a behind-the-ear hearing aid with external handset is known in which a radiation problem with respect to the speaker through a surrounding screen housing, which is connected by means of a shielding line to a zero potential or ground of the hearing aid is solved. But this is another line between the hearing aid housing and speakers necessary. This not only leads to a thicker speaker cable, but also to the need for a larger cable connector or a larger speaker jack on the hearing aid.
  • the present invention has for its object to avoid the described difficulties as effectively and inexpensively.
  • the invention claims a device for reducing interference caused by unbalanced field lines of at least one hearing device component in a receiving antenna of a wireless data transmission device of a hearing aid.
  • All components of a hearing aid which are current-carrying or charged with electrical charge emit electromagnetic interference fields.
  • Starting point of such interference signals are electrical leads (wires, strands, conductors) or passive and active components.
  • Strong interference signal sources in hearing aids are, for example, clocked voltage regulators, analog and digital semiconductor components, supply and output lines of clocked circuits and the hearing device handset.
  • the field line course of the radiated electrical and magnetic interference fields of a component depends on the shape of the corresponding electrically conductive and / or magnetic parts and of electrically conductive and / or magnetic components in their vicinity.
  • the presence of the electrically conductive and / or magnetic components in the hearing aid leads to a field bending of the interference field. On the one hand, this shifts local zeros of the electrical or magnetic interference field or is lost. On the other hand, the bending of the field lines leads to an asymmetry of the coupling into the receiving antenna. In both cases, the interference coupling increases in the receiving antenna.
  • the receiving antenna or a receiving coil of a wireless signal transmission system which uses the inductive range or the typical RF range, the outgoing electromagnetic interference signal is received.
  • the interference of the magnetic field with the receiving antenna depends on the amplitude and direction of the magnetic field with respect to the orientation of the antenna.
  • the magnetic field is preferably perpendicular to the receiving antenna, the interfering field influence is minimized.
  • the interference of the magnetic field in the receiving antenna can also be reduced by geometric arrangements are used in which a symmetrical coupling of the field lines takes place and thus largely extinguished in the coil induced interference currents. For this purpose, symmetry or emission characteristic of the hearing device components can be exploited.
  • the device according to the invention comprises at least one first means arranged in the hearing device, by means of which the asymmetry of the field lines is reduced and the field bending is corrected.
  • the receiving antenna can also be geometrically adapted to the external interference field of the hearing device components in such a way that the interference currents induced in the antenna are compensated by field coupling. As a result, the interference is reduced in the receiving antenna.
  • the receiving antenna comprises a coil core whose winding has a variable density. This compensates for the resulting induced interference currents in the antenna in the case of asymmetrical interference field coupling.
  • the first means for reducing the asymmetry of the field lines preferably has metallic properties.
  • a compensating plate is used as the first means, which corrects the field bending in such a way that the coupling is again symmetrical and the disturbing influence is reduced.
  • a compensating plate for the purpose of miniaturization, as a first means, instead of a compensating plate, already existing suitable metallic or magnetic hearing device components (for example microphone, shielding plates) can be used to compensate the field imbalance. As a result, an additional component can be avoided and the small available space in the hearing device can be used optimally for other hearing aid components or the design of the devices can be reduced.
  • suitable metallic or magnetic hearing device components for example microphone, shielding plates
  • the coil core is asymmetrical, for example in a conical shape. This embodiment is selected when the external field has a field gradient in the coil direction.
  • FIG. 2a shows the ideal state of an interference field of a listener.
  • the interference in an antenna is minimal due to a symmetrical coupling, since induced interference currents compensate each other.
  • an interference field of a listener is deformed by a metallization of a printed circuit board so that the interference in the antenna increases by unbalanced coupling.
  • the field deformation is compensated such that the coupling is again symmetrical and compensates induced interference currents.
  • FIG. 3 illustrates how for the purpose of miniaturization in place of a compensation plate also existing suitable metallic or magnetic hearing aid components (eg microphone, shielding plates) can be used to compensate for a Feldunsymmetrie.
  • suitable metallic or magnetic hearing aid components eg microphone, shielding plates
  • the receiving antenna can be geometrically designed so that compensate for asymmetrical Störfeldeinkopplung the resulting induced noise currents in the antenna.
  • FIGS. 4a-4d Conceivable with an antenna coil are all possible combinations of the geometry of the coil core and the winding density of the coil turns.
  • the coil core may be tapered or the winding density may be gradually reduced when the outer field has a corresponding field gradient in the coil direction.
  • the optimization of both parameters with known interference field can also be computer-aided.
  • the adaptation of the coil geometry to the interference field has the advantage that no additional components such as sheets for field shielding or to compensate for Feldunsymmetrie must be introduced into the hearing aid.
  • the small available space in the hearing aid can in turn be used optimally for other hearing aid components or the design of the hearing aids can be further minimized.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Health & Medical Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Details Of Aerials (AREA)
  • Near-Field Transmission Systems (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Description

Bei der induktiven drahtlosen Übertragung von Daten von einem Hörgerät, einer Relay-Station, einem Programmiergerät oder einer Fernbedienung an ein mit einer geeigneten Empfangseinrichtung ausgestattetes Hörgerät besteht die Schwierigkeit, dass sowohl die maximale Sendeleistung als auch die Empfangsempfindlichkeit begrenzt sind. Aufgrund der relativ geringen Kapazität, Spannung und Spitzenstrombelastbarkeit der verfügbaren Hörgeräte-Batterien ist die maximale Sendeleistung von Hörgeräten begrenzt.In the inductive wireless transmission of data from a hearing aid, a relay station, a programming device or a remote control to a hearing aid equipped with a suitable receiving device, there is the difficulty that both the maximum transmission power and the reception sensitivity are limited. Due to the relatively low capacitance, voltage and peak current capability of the available hearing aid batteries, the maximum transmit power of hearing aids is limited.

Auf der anderen Seite existieren gesetzliche Beschränkungen bezüglich der maximalen Sendeleistung von Funksystemen. Dadurch ergibt sich eine entsprechend eingeschränkte Sendereichweite. Bei den heutzutage gebräuchlichen induktiven Systemen kommt hinzu, dass im normalerweise verwendeten Nahfeld die Reduzierung der Feldstärke in Abhängigkeit von der Entfernung stark ins Gewicht fällt.On the other hand, there are legal restrictions on the maximum transmission power of radio systems. This results in a correspondingly limited transmission range. In the inductive systems commonly used today, in the normally used near field, the reduction of the field strength as a function of the distance is very important.

Aufgrund des daraus resultierenden geringen Pegels des Nutzsignals am Empfänger können schon sehr leistungsarme Störquellen die Übertragungsqualität massiv beeinflussen. Wesentliche Komponenten sowohl des Sendesystems als auch des empfangenden Hörgeräts erzeugen jedoch konstruktionsbedingt elektromagnetische Emissionen, die im Empfangssystem als Störquellen wirken. Solche Störquellen sind z.B. die Induktivitäten getakteter Spannungsregler, Halbleiterbauteile oder Versorgungs- und Ausgangsleitungen praktisch aller getakteten elektronischer Schaltkreise. Im Hörgerät kommt als weitere Störquelle der sogenannte Hörer der Hörgeräte hinzu.Due to the resulting low level of the useful signal at the receiver, very low-power sources of interference can massively affect the transmission quality. However, essential components of both the transmission system and the receiving hearing aid generate by design electromagnetic emissions that act as sources of interference in the receiving system. Such sources of interference include, for example, the inductances of clocked voltage regulators, semiconductor components or supply and output lines of virtually all clocked ones electronic circuits. In the hearing aid comes as a further source of interference, the so-called listener hearing aids added.

Nach dem Stand der Technik ist als Maßnahme die Schirmung der Störquelle mit geeigneten Materialien, z.B. mit einem µ-Metall oder einem anderen geeigneten elektrisch leitfähigen Material. Ein sogenanntes µ-Metall enthält Metalllegierungen hoher Permeabilität µ. Diese schirmen niederfrequente Magnetfelder ab (sog. Ferromagnetische Abschirmung). Näheres hierzu beispielsweise in Zimmermann, J. E., SQUID Instruments and Shielding for low-level magnetic measurements. J. Appl. Phys.; 48:702-710, 1977 .According to the prior art is as a measure the shielding of the source of interference with suitable materials, for example with a μ-metal or other suitable electrically conductive material. A so-called μ-metal contains metal alloys of high permeability μ. These shield low-frequency magnetic fields (so-called ferromagnetic shielding). For details, for example, in Zimmermann, JE, SQUID Instruments and Shielding for low-level magnetic measurements. J. Appl. Phys .; 48: 702-710, 1977 ,

Eine weitere bekannte Maßnahme ist - wo dies möglich ist - ein hinreichender Abstand der Sende- bzw. Empfangsspule zur Störquelle.Another known measure is - where possible - a sufficient distance of the transmitting or receiving coil to the source of interference.

Aus der Druckschrift DE 10 2006 049 471 A1 ist ein Verfahren zur Schätzung eines Störfeldes für eine Antennenspule bekannt. Damit können Antenne und Hörgeräthörer derart positioniert werden, dass die Störung durch den Hörgeräthörer minimiert wird. In Figur 1 ist in schematischer Weise das Prinzip eines geometrischen Abgleichs zwischen Empfangsantenne und als Störquelle fungierendem Hörgerätehörer dargestellt. Die Einkopplung in die Antenne wird messtechnisch aufgenommen, die Position der Antenne solange optimiert, bis die minimale Einkopplung erreicht wird. Die Position der Antenne bzgl. der Störquelle wird dann durch geeignete Maßnahmen (Kleber, Halterung) fest fixiert.From the publication DE 10 2006 049 471 A1 For example, a method for estimating an interference field for an antenna coil is known. In this way, the antenna and the hearing device handset can be positioned in such a way that the interference by the hearing device handset is minimized. In FIG. 1 is shown schematically the principle of a geometric adjustment between the receiving antenna and functioning as a source of interference hearing aid. The coupling into the antenna is recorded metrologically, the position of the antenna optimized until the minimum coupling is achieved. The position of the antenna with respect to the source of interference is then firmly fixed by suitable measures (adhesive, holder).

In der Schrift EP 1 651 006 A2 wird ein Hörhilfgerät mit einer Leitungsschleife zur Kompensation induktiver Störfelder offenbart. Es wird vorgeschlagen, mit Versorgungsleitungen des Hörhilfegerätes gezielt Leitungsschleifen zu legen, so dass ein Gegenfeld zur Abschwächung oder Kompensation von am Ort einer Sende- und/oder Empfangsantenne vorhandenen Störfelder erzeugt wird, um auf diese Weise ein in dem Hörhilfegerät selbst erzeugtes, auf die Sende- und/oder Empfangsantenne wirkendes, elektromagnetisches Störfeld abzuschwächen oder zu kompensieren.In Scripture EP 1 651 006 A2 a hearing aid is disclosed with a line loop to compensate for inductive interference. It is proposed to deliberately lay cable loops with supply lines of the hearing aid device an opposing field for attenuation or compensation of interference fields present at the location of a transmitting and / or receiving antenna is generated in order to attenuate or compensate an electromagnetic interference field generated in the hearing aid itself and act on the transmitting and / or receiving antenna.

Die Druckschrift DE 198 54 201 A1 beschreibt ein Hörhilfegerät mit einer Induktionsspule zur Reduzierung magnetischer Störfelder. Zur aktiven Schirmung eines Hörers des Hörhilfegerätes ist eine Kompensations-Induktivität in einer Hörersignalleitung angeordnet. Dabei erzeugt bei Betrieb der Induktionsspule die Kompensations-Induktivität ein gegen ein Magnetfeld der Induktionsspule gerichtetes Kompensationsfeld, das gegen ein Magnetfeld des Hörers wirkt und eine aktive Abschirmung des Hörers bildet.The publication DE 198 54 201 A1 describes a hearing aid with an induction coil to reduce magnetic interference. For active shielding of a receiver of the hearing aid, a compensation inductance is arranged in a receiver signal line. During operation of the induction coil, the compensation inductance generates a compensation field directed against a magnetic field of the induction coil, which acts against a magnetic field of the listener and forms an active shielding of the handset.

Aus der Schrift WO 2005/020549 A1 ist ein Hinter-dem-Ohr-Hörgerät mit externem Hörer bekannt, bei dem eine Abstrahlproblematik bezüglich des Lautsprechers durch ein diesen umgebendes Schirmgehäuse, das mittels einer Schirmleitung mit einem Nullpotenzial bzw. Erde des Hörgeräts verbunden ist, gelöst wird. Dazu ist aber eine weitere Leitung zwischen Hörgerätegehäuse und Lautsprecher notwendig. Dies führt nicht nur zu einem dickeren Lautsprecherkabel, sondern auch zur Notwendigkeit eines größeren Kabelsteckers bzw. einer größeren Lautsprecherbuchse am Hörgerät.From the Scriptures WO 2005/020549 A1 is a behind-the-ear hearing aid with external handset is known in which a radiation problem with respect to the speaker through a surrounding screen housing, which is connected by means of a shielding line to a zero potential or ground of the hearing aid is solved. But this is another line between the hearing aid housing and speakers necessary. This not only leads to a thicker speaker cable, but also to the need for a larger cable connector or a larger speaker jack on the hearing aid.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die geschilderten Schwierigkeiten möglichst effektiv und kostengünstig zu vermeiden.The present invention has for its object to avoid the described difficulties as effectively and inexpensively.

Gemäß der Erfindung wird diese Aufgabe durch eine Vorrichtung nach dem unabhängigen Patentanspruch gelöst. Vorteilhafte Weiterentwicklungen der Erfindung ergeben sich aus den Unteransprüchen.According to the invention, this object is achieved by a device according to the independent claim solved. Advantageous developments of the invention will become apparent from the dependent claims.

Die Erfindung beansprucht eine Vorrichtung zur Verminderung einer durch unsymmetrisch ausgebildete Feldlinien mindestens einer Hörgerätekomponente verursachte Störeinkopplung in eine Empfangsantenne einer drahtlosen Datenübertragungseinrichtung eines Hörgeräts.The invention claims a device for reducing interference caused by unbalanced field lines of at least one hearing device component in a receiving antenna of a wireless data transmission device of a hearing aid.

Alle stromdurchflossenen oder mit elektrischer Ladung belegten Komponenten eines Hörgeräts senden elektromagnetische Störfelder aus. Ausgangspunkt solcher Störsignale sind elektrische Zuleitungen (Drähte, Litzen, Leiterbahnen) oder passive und aktive Bauteile. Starke Störsignalquellen in Hörgeräten sind beispielsweise getaktete Spannungsregler, analoge und digitale Halbleiterbauteile, Versorgungs- und Ausgangsleitungen von getakteten Schaltkreisen sowie der Hörgerätehörer. Der Feldlinienverlauf der abgestrahlten elektrischen und magnetischen Störfelder einer Komponente hängt von der Form der entsprechenden elektrisch leitenden und/oder magnetischen Teile sowie von elektrisch leitenden und/oder magnetischen Komponenten in deren Nähe ab.All components of a hearing aid which are current-carrying or charged with electrical charge emit electromagnetic interference fields. Starting point of such interference signals are electrical leads (wires, strands, conductors) or passive and active components. Strong interference signal sources in hearing aids are, for example, clocked voltage regulators, analog and digital semiconductor components, supply and output lines of clocked circuits and the hearing device handset. The field line course of the radiated electrical and magnetic interference fields of a component depends on the shape of the corresponding electrically conductive and / or magnetic parts and of electrically conductive and / or magnetic components in their vicinity.

Die Anwesenheit der elektrisch leitenden und/oder magnetischen Komponenten im Hörgerät führt zu einer Feldverbiegung des Störfeldes. Einerseits verschieben sich dadurch lokale Nullstellen des elektrischen bzw. magnetischen Störfeldes oder gehen verloren. Andererseits führt die Verbiegung der Feldlinien zu einer Unsymmetrie der Einkopplung in die Empfangsantenne. In beiden Fällen steigt die Störeinkopplung in die Empfangsantenne. Am Ort der Empfangsantenne oder einer Empfangsspule eines drahtlosen Signalübertragungssystems, das den induktiven Bereich oder den typischen HF-Bereich nutzt, wird das ausgehende elektromagnetische Störsignal empfangen. Der Störeinfluss des Magnetfeldes auf die Empfangsantenne hängt von der Amplitude und der Richtung des Magnetfeldes in Bezug auf Ausrichtung der Antenne ab. Oftmals gelingt es durch geeignete Schirmmaßnahmen nicht, die Amplitude des Störfeldes am Ort der Antenne weit genug zu verringern. Steht das Magnetfeld vorzugsweise senkrecht zur Empfangsantenne, wird die Störfeldbeeinflussung minimiert. Die Störeinkopplung des Magnetfeldes in die Empfangsantenne kann jedoch auch dadurch verringert werden, indem geometrische Anordnungen verwendet werden, bei denen eine symmetrische Einkopplung der Feldlinien stattfindet und sich somit die in die Spule induzierten Störströme weitgehend auslöschen. Hierzu können Symmetrie bzw. Abstrahlcharakteristik der Hörgerätekomponenten ausgenutzt werden.The presence of the electrically conductive and / or magnetic components in the hearing aid leads to a field bending of the interference field. On the one hand, this shifts local zeros of the electrical or magnetic interference field or is lost. On the other hand, the bending of the field lines leads to an asymmetry of the coupling into the receiving antenna. In both cases, the interference coupling increases in the receiving antenna. At the location of the receiving antenna or a receiving coil of a wireless signal transmission system, which uses the inductive range or the typical RF range, the outgoing electromagnetic interference signal is received. The interference of the magnetic field with the receiving antenna depends on the amplitude and direction of the magnetic field with respect to the orientation of the antenna. Often it is not possible by appropriate shielding measures to reduce the amplitude of the interference field at the location of the antenna far enough. If the magnetic field is preferably perpendicular to the receiving antenna, the interfering field influence is minimized. However, the interference of the magnetic field in the receiving antenna can also be reduced by geometric arrangements are used in which a symmetrical coupling of the field lines takes place and thus largely extinguished in the coil induced interference currents. For this purpose, symmetry or emission characteristic of the hearing device components can be exploited.

Die erfindungsgemäße Vorrichtung umfasst mindestens ein im Hörgerät angeordnetes erstes Mittel, durch das die Unsymmetrie der Feldlinien reduziert und die Feldverbiegung korrigiert wird. Zusätzlich oder alternativ kann auch die Empfangsantenne geometrisch derart an das äußere Störfeld der Hörgerätekomponenten angepasst werden, dass sich die durch Feldeinkopplung induzierten Störströme in der Antenne kompensieren. Dadurch wird die Störeinkopplung in die Empfangsantenne reduziert.The device according to the invention comprises at least one first means arranged in the hearing device, by means of which the asymmetry of the field lines is reduced and the field bending is corrected. Additionally or alternatively, the receiving antenna can also be geometrically adapted to the external interference field of the hearing device components in such a way that the interference currents induced in the antenna are compensated by field coupling. As a result, the interference is reduced in the receiving antenna.

Erfindungsgemäß umfasst die Empfangsantenne einen Spulenkern, dessen Wicklung eine variable Dichte aufweist. Hierdurch werden bei unsymmetrischer Störfeldeinkopplung die resultierenden induzierten Störströme in der Antenne kompensiert.According to the invention, the receiving antenna comprises a coil core whose winding has a variable density. This compensates for the resulting induced interference currents in the antenna in the case of asymmetrical interference field coupling.

Vorzugsweise weist das erste Mittel zur Reduzierung der Unsymmetrie der Feldlinien metallische Eigenschaften auf.The first means for reducing the asymmetry of the field lines preferably has metallic properties.

Vorzugsweise wird als erstes Mittel ein Kompensationsblech verwendet, das die Feldverbiegung derart korrigiert, so dass die Einkopplung wieder symmetrisch ist und sich der Störeinfluss verringert.Preferably, a compensating plate is used as the first means, which corrects the field bending in such a way that the coupling is again symmetrical and the disturbing influence is reduced.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung können zum Zweck der Miniaturisierung als erstes Mittel anstelle eines Kompensationsbleches auch bereits vorhandene geeignete metallische bzw. magnetische Hörgerätekomponenten (z.B. Mikrofon, Schirmbleche) zur Kompensation der Feldunsymmetrie verwendet werden. Dadurch kann eine zusätzliche Komponente vermieden und der geringe zur Verfügung stehende Platz im Hörgerät optimal für andere Hörgerätekomponenten genutzt werden bzw. die Bauform der Geräte verringert werden.In a further advantageous embodiment of the invention, for the purpose of miniaturization, as a first means, instead of a compensating plate, already existing suitable metallic or magnetic hearing device components (for example microphone, shielding plates) can be used to compensate the field imbalance. As a result, an additional component can be avoided and the small available space in the hearing device can be used optimally for other hearing aid components or the design of the devices can be reduced.

In einer weiteren vorteilhaften Ausführungsform ist der Spulenkern unsymmetrisch, z.B. in konischer Form, ausgeführt. Diese Ausgestaltung wird dann gewählt, wenn das äußere Feld einen Feldgradienten in Spulenrichtung aufweist.In a further advantageous embodiment, the coil core is asymmetrical, for example in a conical shape. This embodiment is selected when the external field has a field gradient in the coil direction.

Weitere Besonderheiten und Vorteile der Erfindung werden aus den nachfolgenden Erläuterungen zu mehreren Ausführungsbeispielen anhand von schematischen Zeichnungen ersichtlich.Other features and advantages of the invention will become apparent from the following explanations to several embodiments with reference to schematic drawings.

Es zeigen:Show it:

Figur 1:FIG. 1:
eine perspektivische Ansicht einer Empfangsantenne und eines als Störquelle fungierenden Hörgerätehörers,a perspective view of a receiving antenna and acting as a source of interference hearing aid,
Figur 2a:FIG. 2a:
in schematischer Ansicht eine idealisierte symmetrische Einkopplung in eine Antenne,in a schematic view an idealized symmetrical coupling into an antenna,
Figur 2b:FIG. 2b:
in schematischer Ansicht eine unsymmetrische Feldverbiegung durch eine Metallisierung einer Leiterplatte,a schematic view of an unbalanced field bending by a metallization of a printed circuit board,
Figur 2c:FIG. 2c:
in schematischer Ansicht eine Kompensation einer Feldunsymmetrie durch ein Metallblech gemäß eines Ausführungsbeispiels der Erfindung,a schematic view of a compensation of a Feldunsymmetrie by a metal sheet according to an embodiment of the invention,
Figur 3:FIG. 3:
in schematischer Ansicht einen Einsatz von Hörgerätekomponenten zur Kompensation der Unsymmetrie einer Störfeldeinkopplung gemäß einem Ausführungsbeispiel der Erfindung,1 is a schematic view of a use of hearing device components to compensate for the asymmetry of a Störfeldeinkopplung according to an embodiment of the invention,
Figur 4a:FIG. 4a
in schematischer Ansicht eine Variation der Wicklungsdichte eines Spulenkerns gemäß eines Ausführungsbeispiels der Erfindung,a schematic view of a variation of the winding density of a spool core according to an embodiment of the invention,
Figur 4b:FIG. 4b:
in schematischer Ansicht eine unsymmetrische Wicklung eines Spulenkerns gemäß eines Ausführungsbeispiels der Erfindung,a schematic view of an asymmetrical winding of a coil core according to an embodiment of the invention,
Figur 4c:FIG. 4c:
in schematischer Ansicht einen unsymmetrischen Spulenkern gemäß eines Ausführungsbeispiels der Erfindung undin a schematic view of an asymmetrical coil core according to an embodiment of the invention and
Figur 4d:FIG. 4d:
in schematischer Ansicht eine Kombination einer Variation der Wicklungsdichte eines Spulenkerns und eines unsymmetrischen Spulenkerns gemäß eines Ausführungsbeispiels der Erfindung.a schematic view of a combination of a variation of the winding density of a spool core and a single-ended spool core according to an embodiment of the invention.

Figur 2a zeigt den Idealzustand eines Störfelds eines Hörers. Der Störeinfluss in eine Antenne ist aufgrund einer symmetrischen Einkopplung minimal, da sich induzierte Störströme kompensieren. FIG. 2a shows the ideal state of an interference field of a listener. The interference in an antenna is minimal due to a symmetrical coupling, since induced interference currents compensate each other.

In Figur 2b wird ein Störfeld eines Hörers durch eine Metallisierung einer Leiterplatte so verformt, dass der Störeinfluss in der Antenne durch unsymmetrische Einkopplung steigt. Durch zusätzlichen Einsatz eines dünnen metallischen Kompensationsbleches wird die Feldverformung so kompensiert, dass die Einkopplung wieder symmetrisch ist und sich induzierte Störströme kompensieren.In FIG. 2b an interference field of a listener is deformed by a metallization of a printed circuit board so that the interference in the antenna increases by unbalanced coupling. By additional use of a thin metal compensation plate, the field deformation is compensated such that the coupling is again symmetrical and compensates induced interference currents.

In Figur 2c erfolgt der Einsatz eines Kompensationsbleches, durch das eine Feldverbiegung korrigiert wird, so dass die Einkopplung wieder symmetrisch ist und sich der Störeinfluss verringert.In Figure 2c the use of a compensation plate, by which a field bending is corrected, so that the coupling is symmetrical again and reduces the interference.

Figur 3 veranschaulicht, wie zum Zweck der Miniaturisierung an Stelle eines Kompensationsbleches auch bereits vorhandene geeignete metallische bzw. magnetische Hörgerätekomponenten (z.B. Mikrofon, Schirmbleche) zur Kompensation einer Feldunsymmetrie verwendet werden können. Dadurch kann eine zusätzliche Komponente vermieden und der geringe zur Verfügung stehende Platz im Hörgerät optimal für andere Hörgerätekomponenten genutzt werden bzw. die Bauform der Geräte verringert werden. FIG. 3 illustrates how for the purpose of miniaturization in place of a compensation plate also existing suitable metallic or magnetic hearing aid components (eg microphone, shielding plates) can be used to compensate for a Feldunsymmetrie. As a result, an additional component can be avoided and the small available space in the hearing device optimally for other hearing aid components be used or the design of the devices are reduced.

Die Empfangsantenne kann geometrisch so ausgeführt werden, dass sich bei unsymmetrischer Störfeldeinkopplung die resultierenden induzierten Störströme in der Antenne kompensieren.The receiving antenna can be geometrically designed so that compensate for asymmetrical Störfeldeinkopplung the resulting induced noise currents in the antenna.

Weitere Ausführungsbeispiele sind in den Figuren 4a-4d dargestellt. Denkbar bei einer Antennenspule sind alle möglichen Kombinationen aus der Geometrie des Spulenkerns und der Wicklungsdichte der Spulenwindungen. Beispielsweise kann der Spulenkern kegelförmig ausgeführt werden oder die Wicklungsdichte graduell verringert werden, wenn das äußere Feld einen dementsprechenden Feldgradienten in Spulenrichtung aufweist. Die Optimierung beider Parameter bei bekanntem Störfeld kann auch rechnergestützt erfolgen. Die Anpassung der Spulengeometrie an das Störfeld hat den Vorteil, dass keine zusätzlichen Komponenten wie Bleche zur Feldabschirmung oder zur Kompensation der Feldunsymmetrie in das Hörgerät eingebracht werden müssen. Der geringe zur Verfügung stehende Platz im Hörgerät kann wiederum optimal für andere Hörgerätekomponenten genutzt werden oder die Bauform der Hörgeräte kann weiter minimiert werden.Further embodiments are in the FIGS. 4a-4d shown. Conceivable with an antenna coil are all possible combinations of the geometry of the coil core and the winding density of the coil turns. For example, the coil core may be tapered or the winding density may be gradually reduced when the outer field has a corresponding field gradient in the coil direction. The optimization of both parameters with known interference field can also be computer-aided. The adaptation of the coil geometry to the interference field has the advantage that no additional components such as sheets for field shielding or to compensate for Feldunsymmetrie must be introduced into the hearing aid. The small available space in the hearing aid can in turn be used optimally for other hearing aid components or the design of the hearing aids can be further minimized.

Claims (7)

  1. Apparatus for reducing an interference input coupling produced by asymmetrically embodied field lines of at least one hearing device component into a receiving antenna of a wireless data transmission facility of a hearing device, having
    - at least one first means arranged in the hearing device, which reduces the asymmetry of the field lines and/or
    - a geometry of the receiving antenna, by means of which an induced interference current resulting from the asymmetrical interference field input coupling can be compensated, characterised in that
    the receiver antenna includes a coil bobbin and a winding surrounding it and that the winding surrounding the coil bobbin has a variable tightness.
  2. Apparatus according to claim 1, characterised in that the coil bobbin is asymmetrical.
  3. Apparatus according to claim 1 or 2,
    characterised in that
    the asymmetry of the field lines as a result of their distortion is caused by the presence of electrically conductive and/or magnetic components in the hearing device.
  4. Apparatus according to one of the preceding claims, characterised in that
    the hearing device components include clocked voltage controllers, semi-conductor components, supply and output lines of clocked switching circuits and a receiver.
  5. Apparatus according to one of the preceding claims, characterised in that
    the first means is metallic.
  6. Apparatus according to claim 5,
    characterised in that
    the first means includes a compensation plate.
  7. Apparatus according to one of the preceding claims, characterised in that
    the first means includes at least one metallic or magnetic hearing device component.
EP09155631.6A 2008-05-05 2009-03-19 Apparatus for reducing interferences in a wireless data transmission in hearing aid applications Active EP2124481B1 (en)

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DE102008022126 2008-05-05

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DE102009007233B4 (en) * 2009-02-03 2012-07-26 Siemens Medical Instruments Pte. Ltd. Hearing device with noise compensation and design method
SE537359C2 (en) 2011-02-24 2015-04-14 Craj Dev Ltd Device for hearing aid system
DE102013210689B3 (en) 2013-06-07 2014-10-02 Siemens Medical Instruments Pte. Ltd. Antenna device for hearing instruments
DE102014200524A1 (en) * 2014-01-14 2015-07-16 Siemens Medical Instruments Pte. Ltd. Antenna device for hearing instruments
DK3148219T3 (en) * 2015-09-28 2021-01-25 Oticon As HEARING DEVICE
US11131601B2 (en) * 2017-11-30 2021-09-28 Rain Tree Photonics Pte. Ltd. Method for in-line optical testing
US10511920B2 (en) 2018-04-13 2019-12-17 Starkey Laboratories, Inc. Ear-worn electronic device incorporating directional magnetic antenna
EP3831096A4 (en) 2018-07-31 2022-06-08 Earlens Corporation INTERMODULATION DISTORTITION REDUCTION IN A CONTACT HEARING AID

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EP2124481A3 (en) 2012-10-24
EP2124481A2 (en) 2009-11-25
DK2124481T3 (en) 2013-12-16
US20090274328A1 (en) 2009-11-05

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