EP1651005B1 - Synchronisierung von erzeugtem Ton bei binauralem Hörsystem - Google Patents

Synchronisierung von erzeugtem Ton bei binauralem Hörsystem Download PDF

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Publication number
EP1651005B1
EP1651005B1 EP05027729.2A EP05027729A EP1651005B1 EP 1651005 B1 EP1651005 B1 EP 1651005B1 EP 05027729 A EP05027729 A EP 05027729A EP 1651005 B1 EP1651005 B1 EP 1651005B1
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EP
European Patent Office
Prior art keywords
hearing
hearing device
audio signals
signals
sound
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Expired - Lifetime
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EP05027729.2A
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English (en)
French (fr)
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EP1651005A2 (de
EP1651005A3 (de
Inventor
Hans-Ueli Roeck
Raoul Glatt
Micha Knaus
Rolf Laich
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Sonova Holding AG
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Sonova AG
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Priority to DK05027729.2T priority Critical patent/DK1651005T3/en
Priority to EP05027729.2A priority patent/EP1651005B1/de
Publication of EP1651005A2 publication Critical patent/EP1651005A2/de
Publication of EP1651005A3 publication Critical patent/EP1651005A3/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/55—Electric hearing aids using an external connection, either wireless or wired
    • H04R25/552—Binaural
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • a monaural hearing device which comprises a signal emission device by means of which a user of the hearing device can be informed that a particular setting of the hearing device has been selected.
  • WO 01/30127 A2 a monaural hearing device is known, which allows to play user-defined sequences for acknowledging an action that has been carried out on the hearing device.
  • a binaural hearing system in which audio signals obtained from digitizing output signals of a microphone of the hearing system are transmitted from one hearing device of the system to the other hearing device of the system via a communication link. Furthermore, control signals can be transmitted via said communication link.
  • control signals can, e.g., be signals for controlling a signal processor of a hearing device, or signals by means of which a first of the two hearing devices acknowledges to the second hearing device that is has received a control signal that was transmitted from the second hearing device to the first hearing device.
  • the two hearing devices are synchronized by a controlled time-multiplexer unit, which is operated by a respective time control unit, wherein the two time control units are synchronized via said communication link.
  • a binaural hearing system with two hearing devices in which a communication link is provided between the two hearing devices for transmitting control and audio signals.
  • a control signal is generated by this hearing device and sent to the other hearing device in order to cause the same adjustment to the other hearing device's operation.
  • audio signals coming from a signal processing unit in either of the hearing devices can be sent to a signal processing unit in the other hearing device via the communication link.
  • a goal of the invention is, to create a binaural hearing system and a method of operating a hearing system and a method of synchronization in a hearing system with enhanced possibilities for giving the user of the hearing system the impression that he perceives signals from a certain location or certain direction.
  • One object of the invention is to provide for a binaural hearing system and a method of operating a hearing system and a method of synchronization in a hearing system with improved possibilities for synchronizing the perception of sound in the user's left and the right ear.
  • Another object of the invention is to provide for a binaural hearing system and a method of operating a hearing system and a method of synchronization in a hearing system providing for a precisely predictable time difference between the user's perception of system-generated signals in the user's left and right ears.
  • the binaural hearing system comprises
  • tick period is typically of the order of 10 ms (some milliseconds to some ten milliseconds).
  • the threads in the two hearing devices are usually not in phase and do usually not even have a constant phase relation, and even the tick periods in the two hearing devices are usually somewhat different.
  • the two hearing devices are switched on at different times; the booting of the hearing device controlling software does not take exactly the same amount of time in both hearing devices; the clock oscillators in the two hearing devices show (different) drift; the clock oscillators in the two hearing devices are (slightly) differently tuned.
  • particular tasks may run along threads which are different from the thread of other parts of the hearing device software.
  • the thread may even have a different tick period than the hearing device control software.
  • some types of processes within a hearing device are deterministic (within the desired timing accuracy), e.g., signal processing, conversion, amplification or transmission of data or signals from one hearing device to the other.
  • the time required for such processes can be determined in advance; accordingly, they do not contribute to a (random) jitter.
  • Only one stream of audio signals (acoustic sound message data) is generated (issued), by only one of the two hearing devices, and this stream is delivered, via said communication link, to the other hearing device, in which it may undergo amplification and other processing and finally presentation to the user with near-negligible latency with respect to the contralateral side.
  • equal or similar processing of the audio signals may take place, and, if required, pre-determinable delays between the two sides may be accomplished for by introducing an according delay on the faster side.
  • An audio signal (or sound message) originating from a single source is presented to the user with a deterministic delay between the two sides.
  • the invention can be used in conjunction with acknowledge signals (or other sound messages) as the signals to be perceived by the hearing device user.
  • Acknowledge sounds also called feedback sounds, are played to the user upon a change in the hearing device's function, e.g., when the user changes the loudness (volume) or another setting or program of one or both hearing devices, or when some other user's manipulation shall be acknowledged, or when the hearing device by itself takes an action, e.g., by making a change, e.g., if, in the case of a hearing aid, the hearing aid chooses, in dependence of the acoustical environment, a different hearing program (frequency-volume settings and the like), or when the hearing device user shall be informed that a hearing device's battery is low.
  • a change in the hearing device's function e.g., when the user changes the loudness (volume) or another setting or program of one or both hearing devices, or when some other user's manipulation shall be acknowledged, or when the hearing device by itself takes an action, e.g., by making a change, e.g., if, in the case of a hearing aid, the hearing
  • Said signals to be perceived by the user are often acoustic signals (sound waves), but may be other signals as well, e.g., in the case of implanted hearing devices.
  • the hearing devices' output transducers can therefore be electro-to-mechanical converters (loudspeakers) or others, e.g., electrical-to-electrical converters.
  • Said audio signals are usually electrical signals, analogue and/or digital.
  • Said communication link may be wireless (typically electromagnetically; e.g., in the radio frequency range via frequency modulation, or Ultra-Wide-Band communication UWB), or wire-bound.
  • Said communication link allows for communication at least from said first hearing device to said second hearing device, but usually allows for bidirectional communication.
  • Said communication link may involve at least one transmitter comprised in said first hearing device and at least one receiver comprised in said second hearing device. It may, in addition, comprise at least one receiver comprised in said first hearing device and at least one transmitter comprised in said second hearing device.
  • Said sound generator may be implemented in software or (partially) in form of hardware.
  • said first and said second hearing devices each comprise an input transducer for receiving incoming signals and for converting said incoming signals into audio signals.
  • incoming signals are incoming sound
  • said input transducers are mechanical-to-electrical converters (microphones), but converters receiving electromagnetical waves and converting these into audio signals are also possible (e.g., in case of a telephone coil or reception of a remote microphone signal via a frequency modulation -FM- receiver).
  • At least one of said hearing devices each comprise a signal processor for processing audio signals.
  • the system comprises, comprised in said first hearing device, a first sound memory, which comprises a first set of data, which describe audio signals (in particular, first audio signals), and, comprised in said second hearing device, a second sound memory, which comprises a second set of data, which describe audio signals, wherein said first and second sets of data are substantially different from each other.
  • both hearing devices contain data describing (different) audio signals, and, accordingly, the required storage space in each hearing device can be (up to) halved (with respect to storing the same data in each hearing device).
  • the sound generator can produce the corresponding audio signal, which finally can be transmitted to the second hearing device and transduced into signals acknowledging said manipulation (on both sides).
  • the data sets can be considered first and second sets of acknowledge sound descriptions (or representations).
  • audio signals may be described, e.g., in a parametrized form (e.g., as a frequency to be played and a time for which it is to be played), or in a sampled form (e.g., compressed, like in MP3 format).
  • a parametrized form e.g., as a frequency to be played and a time for which it is to be played
  • sampled form e.g., compressed, like in MP3 format
  • At least one of said first and said second hearing devices comprises a storage unit containing information on the contents of said first sound memory and/or of said second sound memory.
  • a storage unit containing information on the contents of said first sound memory and/or of said second sound memory.
  • the storage unit may be a table or a look-up table.
  • the system furthermore comprises a second sound generator for generating second audio signals, which is comprised in said second hearing device, and wherein said second hearing device is adapted to transmitting said second audio signals to said first hearing device via said communication link.
  • both hearing devices comprise a sound generator, and sound generated in either sound generator may be transmitted to the other hearing device.
  • Said first audio signals, and also said second audio signals may comprise or be acknowledge sound signals.
  • the corresponding time delays in each hearing device can be calculated in advance, and corresponding delays may be used in order to let the user perceive the sounds in each ear with a well-defined time delay.
  • the features of the method of synchronization in a hearing system corresponds to the features of the method for operating a hearing system.
  • the method allows for a synchronized perception of signals to be perceived by the user in each ear.
  • the method may furthermore comprise the steps of
  • said first hearing device comprises a first sound memory, which comprises a first set of data, which describe audio signals (first and/or second audio signals)
  • said second hearing device comprises a second sound memory, which comprises a second set of data, which describe audio signals (first and/or second audio signals)
  • said first and second sets of data are substantially different from each other, further comprises the step of
  • This method wherein at least one of said first and said second hearing devices comprises a storage unit containing information on the contents of said first sound memory and (or and/or) of said second sound memory, may further comprise the steps of
  • a command can be transmitted (via said communication link) to the other hearing device (which comprises the sound memory comprising said data) in order to retrieve the desired sound memory data.
  • FIGs. 1 and 2 show schematic diagrams of hearing systems 1.
  • a hearing system 1 comprises two hearing devices 10L and 10R, which may be similarly or identically structured.
  • the hearing device 10L of Figs. 1 and 2 may comprise some more elements, in particular such, which are only drawn in the first hearing device 10R.
  • audio signals (audio data streams) are drawn as solid arrows; control signals or data are represented by dashed arrows. Not all possible signal flows are indicated, but only some, which are required to explain the invention.
  • the hearing devices 10R, 10L comprise controllers or control softwares 15L, 15R.
  • the hearing devices 10L, 10R comprise input transducers 11L, 11R, typically microphones, which convert incoming sound 5 into audio signals (analogue and/or digital electrical signals).
  • audio signals may be processed in signal processors 13L, 13R, preferably digital signal processors (DSP), and are possibly amplified in amplifiers 14L, 14R before being converted into signals 7,8 to be perceived by a user of the hearing system 1 by output transducers 12L,12R, typically loudspeakers.
  • DSP digital signal processors
  • Hearing device 10L comprises a receiver Re.
  • Fig. 1 it is sketched, how a concurrent or (practically) jitter-free perception by the user of an acknowledge sound, e.g. upon a volume change in hearing device 10R, can be achieved.
  • the user manipulates the user interface 16R in order to change the volume (loudness) of signals 7,8 he perceives (typically the loudness in both hearing devices shall be changed).
  • This generates a control signal, whereupon the sound generator 17R is instructed by the controller 15R to generate an appropriate sound message (acknowledge signal), which is referred to as first audio signals 30.
  • the first audio signals 30 are, on the one hand, fed to the output transducer 12R (e.g., via DSP 13R and amplifier 14R, or directly, or in between the two) to be converted into signals 7 to be perceived by the user, and on the other hand, fed to the transmitter Tr of the hearing device 10R.
  • the output transducer 12R e.g., via DSP 13R and amplifier 14R, or directly, or in between the two
  • the transmitter Tr of the hearing device 10R instead of adding the first audio signals 30 to audio signals obtained from incoming sound 5, they may as well replace those audio signals.
  • the first audio signals 30 are made available in the hearing device 10L, where they are, in analogy to the hearing device 10R, converted into signals 8 to be perceived by the user.
  • the (first) audio signals may be processed using Head-Related Transfer Functions (HRTF) in the sense that not only interaural time differences (ITD) are applied as described above, but also interaural level differences (ILD), or, more generally speaking, frequency dependent interaural amplitude and phase differences.
  • HRTF Head-Related Transfer Functions
  • Fig. 2 shows, in the manner of Fig. 1 , a schematic diagram of another hearing system 1.
  • the embodiment is similar to the one of Fig. 1 , and mainly the additional or different features will be described.
  • Both hearing devices 10L, 10R comprise a sound memory 18L, 18R, in each of which a set of data describing audio signals (e.g., acknowledge sounds and/or speech sounds) are contained.
  • the sound memory 18R may contain (data describing) acknowledge sounds, which are to be played when the volume is increased, when the volume is decreased, or when the battery level is low, whereas in the sound memory 18L, (data describing) acknowledge sounds may be stored, which acknowledge a change from one hearing program to another hearing program.
  • Both hearing devices comprise a transmitter Tr and a receiver Re each, thus enabling a bidirectional communication link 20.
  • Fig. 2 it is sketched, how a concurrent or (practically) jitter-free perception by the user of an acknowledge sound, e.g. upon a volume change in hearing device 10L, can be achieved.
  • the user manipulates the second hearing device's user interface 16L.
  • the controller checks the storage unit (table, LUT) 19L and finds out, that the appropriate acknowledge sound (first audio signals 30) is not stored in the sound memory 18L, but in the sound memory 18R of the contralateral hearing device 10R. Thereupon, a control signal is transmitted via the second hearing device's transmitter Tr and the first hearing device's receiver Re to the second hearing device's controller 15R.
  • the controller 15R ensures that the requested data 40 representing (describing) the requested first audio signals 30 are loaded from the sound memory 18R and that the requested audio signals 30 are generated.
  • the requested audio signals 30 are fed towards the output transducer 12R and, in addition, transmitted to the second hearing device 10L via the communication link 20, from where it is transmitted to the output transducer 12L
  • the second hearing device 10L may comprise a sound generator.
  • data and/or audio signals have to be transmitted via the communication link 20.
  • Fig. 3 shows a block diagram of a simple method of operating a hearing system 1.
  • the steps 100 - 300 are self-explaining.
  • the invention enables for a deterministic (predictable) latency and negligible jitter for signals to be perceived by the user's two ears.
  • the invention is particularly useful, when speech signals or more complex sounds are to be generated and presented to the user.
  • the complexity of a sound may manifest in its (large) spectral content, its structure in time or rhythmic or percussive structure.
  • Speech sounds may be used for guiding the user, informing the user and acknowledging events in the hearing system. Requirements for latency and jitter are less tough for simple sounds, like sine tones that fade in and fade out.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic System (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Claims (11)

  1. Binaurales Hörsystem (1), umfassend
    - ein erstes Hörgerät (10R) und ein zweites Hörgerät (10L), die jeweils Folgendes umfassen: einen Eingangswandler (11L, 11R), um eingehende Signale (5) zu empfangen und die eingehenden Signale (5) in Eingangs-Audiosignale umzuwandeln, und einen Ausgangswandler (12L, 12R), um Audiosignale in Signale (7, 8) umzuwandeln, die von einem Benutzer des Hörsystems wahrgenommen werden sollen;
    - eine Kommunikationsverbindung (20), welche das erste (10R) und das zweite (10L) Hörgerät miteinander verbindet; und
    - einen Tongenerator (17R), der in dem ersten Hörgerät (10R) enthalten ist, um in dem ersten Hörgerät (10R) Tonnachrichten, insbesondere Bestätigungstonsignale, als erste Audiosignale (30) zu erzeugen;
    dadurch gekennzeichnet, dass
    das erste Hörgerät (10R) dafür eingerichtet ist, die ersten Audiosignale (30) über die Kommunikationsverbindung (20) zu dem zweiten Hörgerät (10L) zu übertragen.
  2. System (1) nach Anspruch 1, das derart eingerichtet ist, dass entweder eines oder beides von den ersten Audiosignalen (30) und den Eingangs-Audiosignalen als Audiosignale in den Ausgangswandler (12R) des ersten Hörgeräts (10R) eingespeist werden, um in die Signale (7) umgewandelt zu werden, die von dem Benutzer des Hörsystems wahrgenommen werden sollen.
  3. System (1) nach Anspruch 1 oder Anspruch 2, umfassend auf in dem ersten Hörgerät (10R) enthaltene Weise einen ersten Tonspeicher (18R), der einen ersten Satz von Daten umfasst, die Audiosignale beschreiben, und auf in dem zweiten Hörgerät (10L) enthaltene Weise einen zweiten Tonspeicher (18L), der einen zweiten Satz von Daten umfasst, die Audiosignale beschreiben, wobei der erste und zweite Datensatz im Wesentlichen voneinander verschieden sind.
  4. System (1) nach Anspruch 3, wobei wenigstens eines von dem ersten (10R) und dem zweiten (10L) Hörgerät eine Speichereinheit (19L, 19R) umfasst, die Informationen über den Inhalt des ersten Tonspeichers (18R) und/oder des zweiten Tonspeichers (18L) enthält.
  5. System (1) nach einem der vorhergehenden Ansprüche, ferner umfassend einen zweiten Tongenerator (17L) zum Erzeugen von zweiten Audiosignalen, der in dem zweiten Hörgerät (10L) enthalten ist, und wobei das zweite Hörgerät dafür eingerichtet ist, die zweiten Audiosignale über die Kommunikationsverbindung (20) zu dem ersten Hörgerät zu übertragen.
  6. System (1) nach Anspruch 5, wobei die zweiten Audiosignale Bestätigungstonsignale umfassen.
  7. Verfahren zum Betreiben eines Hörsystems (1), umfassend ein erstes (10R) und ein zweites (10L) Hörgerät und eine Kommunikationsverbindung (20), welche die zwei Hörgeräte (10L, 10R) miteinander verbindet, wobei das Verfahren die folgenden Schritte umfasst:
    - Umwandeln von eingehenden Signalen (5) in Eingangs-Audiosignale durch einen Eingangswandler (11R), der in dem ersten Hörgerät (10R) enthalten ist;
    - durch einen Tongenerator (17R) erfolgendes Erzeugen von Tonnachrichten, insbesondere Bestätigungstonsignalen, als erste Audiosignale (30) in dem ersten Hörgerät (10R);
    - Übertragen der ersten Audiosignale (30) zu dem zweiten Hörgerät (10L) über die Kommunikationsverbindung (20); und
    - in jedem der zwei Hörgeräte (10L, 10R) erfolgendes Umwandeln der ersten Audiosignale (30) in Signale (7, 8), die von einem Benutzer des Hörsystems wahrgenommen werden sollen.
  8. Verfahren nach Anspruch 7, ferner umfassend den folgenden Schritt:
    - Einspeisen von entweder einem oder beiden von den ersten Audiosignalen (30) und den Eingangs-Audiosignalen als Audiosignale in einen Ausgangswandler (12R) des ersten Hörgeräts (10R), um in die Signale (7) umgewandelt zu werden, die von dem Benutzer des Hörsystems wahrgenommen werden sollen.
  9. Verfahren nach Anspruch 7 oder 8, ferner umfassend die folgenden Schritte:
    - Erzeugen von zweiten Audiosignalen in dem zweiten Hörgerät (10L); und
    - Übertragen der zweiten Audiosignale zu dem ersten Hörgerät (10R) über die Kommunikationsverbindung (20).
  10. Verfahren nach einem der Ansprüche 7 bis 9, wobei das erste Hörgerät (10R) einen ersten Tonspeicher (18R) umfasst, der einen ersten Satz von Daten umfasst, die Audiosignale beschreiben, und wobei das zweite Hörgerät (10L) einen zweiten Tonspeicher (18L) umfasst, der einen zweiten Satz solcher Daten umfasst, die Audiosignale beschreiben, und wobei der erste und zweite Datensatz im Wesentlichen voneinander verschieden sind, ferner umfassend den folgenden Schritt:
    - Übertragen der Daten vom zweiten Tonspeicher (18L) über die Kommunikationsverbindung (20) zum ersten Hörgerät (10R).
  11. Verfahren nach Anspruch 10, wobei wenigstens eines von dem ersten (10R) und dem zweiten (10L) Hörgerät eine Speichereinheit (19R; 19L) umfasst, die Informationen über den Inhalt des ersten Tonspeichers (18R) und/oder des zweiten Tonspeichers (18L) enthält, ferner umfassend die folgenden Schritte:
    - Abrufen von Informationen aus der Speichereinheit (19R; 19L), ob Audiosignale (7, 8), die in Signale umzuwandeln sind, die von einem Benutzer des Hörsystems (1) wahrgenommen werden sollen, aus den in dem ersten Tonspeicher (18R) enthaltenen Daten oder aus den in dem zweiten Tonspeicher (18L) enthaltenen Daten gewonnen werden sollen;
    - aus dem entsprechenden Tonspeicher (18R; 18L) erfolgendes Abrufen von Daten, welche die entsprechenden Audiosignale beschreiben.
EP05027729.2A 2005-12-19 2005-12-19 Synchronisierung von erzeugtem Ton bei binauralem Hörsystem Expired - Lifetime EP1651005B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK05027729.2T DK1651005T3 (en) 2005-12-19 2005-12-19 Synchronization of sound generated in binaural hearing aid system
EP05027729.2A EP1651005B1 (de) 2005-12-19 2005-12-19 Synchronisierung von erzeugtem Ton bei binauralem Hörsystem

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Application Number Priority Date Filing Date Title
EP05027729.2A EP1651005B1 (de) 2005-12-19 2005-12-19 Synchronisierung von erzeugtem Ton bei binauralem Hörsystem

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EP1651005A2 EP1651005A2 (de) 2006-04-26
EP1651005A3 EP1651005A3 (de) 2006-07-05
EP1651005B1 true EP1651005B1 (de) 2017-03-22

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Publication number Priority date Publication date Assignee Title
EP2039218B1 (de) 2006-07-12 2020-12-02 Sonova AG Verfahren zur bedienung eines binauralen hörsystems sowie binaurales hörsystem
DK1885156T3 (da) 2006-08-04 2013-07-29 Siemens Audiologische Technik Høreapparat med en audiosignalgenerator
US8526648B2 (en) 2007-01-22 2013-09-03 Phonak Ag System and method for providing hearing assistance to a user
DE102007015223B4 (de) * 2007-03-29 2013-08-22 Siemens Audiologische Technik Gmbh Verfahren und Einrichtung zur Wiedergabe synthetisch erzeugter Signale durch ein binaurales Hörsystem
US8477975B2 (en) 2007-12-20 2013-07-02 Phonak Ag Hearing system with joint task scheduling
EP2547122A4 (de) * 2010-03-08 2013-01-16 Panasonic Corp Hörgerät

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AU733433B2 (en) * 1998-02-18 2001-05-17 Widex A/S A binaural digital hearing aid system
DK0941014T3 (da) * 1998-03-03 2006-05-22 Siemens Audiologische Technik Höreapparatsystem med to höreapparater
US7254246B2 (en) 2001-03-13 2007-08-07 Phonak Ag Method for establishing a binaural communication link and binaural hearing devices
DE102004035046A1 (de) 2004-07-20 2005-07-21 Siemens Audiologische Technik Gmbh Hörhilfe-oder Kommunikationssystem mit virtuellen Signalquellen
DE102004035256B3 (de) * 2004-07-21 2005-09-22 Siemens Audiologische Technik Gmbh Hörhilfegerätesystem sowie Verfahren zum Betrieb eines Hörhilfegerätesystems bei Audio-Empfang

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EP1651005A2 (de) 2006-04-26
DK1651005T3 (en) 2017-07-10
EP1651005A3 (de) 2006-07-05

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