EP0723381B1 - Dispositif d'assistance auditive - Google Patents

Dispositif d'assistance auditive Download PDF

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Publication number
EP0723381B1
EP0723381B1 EP94120781A EP94120781A EP0723381B1 EP 0723381 B1 EP0723381 B1 EP 0723381B1 EP 94120781 A EP94120781 A EP 94120781A EP 94120781 A EP94120781 A EP 94120781A EP 0723381 B1 EP0723381 B1 EP 0723381B1
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EP
European Patent Office
Prior art keywords
control unit
region
microphones
ear
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94120781A
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German (de)
English (en)
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EP0723381A1 (fr
EP0723381B2 (fr
Inventor
Markus Poetsch
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to DE59402320T priority Critical patent/DE59402320D1/de
Priority to AT94120781T priority patent/ATE151217T1/de
Priority to DK94120781T priority patent/DK0723381T4/da
Priority to EP94120781A priority patent/EP0723381B2/fr
Publication of EP0723381A1 publication Critical patent/EP0723381A1/fr
Application granted granted Critical
Publication of EP0723381B1 publication Critical patent/EP0723381B1/fr
Publication of EP0723381B2 publication Critical patent/EP0723381B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R25/04—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception comprising pocket amplifiers
    • 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
    • H04R25/552—Binaural
    • 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
    • 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
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/602—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of batteries

Definitions

  • the invention relates to a device for hearing support, which has two microphones, which are coupled to a control unit and feed the control unit with input signals and in which the control unit transmits at least one output signal to at least one transmission element and in which the control unit is arranged spatially separate from the microphones , and in which the microphones are accommodated in ear housings which can be arranged in the region of a human ear and in which the ear housings are each provided with a transmitter which communicates with a receiver in the region of the control unit, and in which at least one of the ear housings has one of the transmission elements is arranged, which is provided with a receiver which communicates with a transmitter in the area of the control unit and in which an analyzer is arranged in the area of the control unit for evaluating the signals of the microphones.
  • a device for hearing support in which a microphone is coupled to a control unit and in which the control unit is arranged spatially separate from the microphone.
  • the microphone is arranged in the area of an ear housing that can be picked up by a human ear.
  • Communication takes place via a receiver and a transmitter and is in the area of the control unit an analyzer for evaluating the signals of the microphone is arranged.
  • DE-A-2 406 218 describes a device for hearing support in which two microphones are already used. However, both microphones are arranged in a common ear housing. At least one of the microphones has a directional characteristic. The signals from the two microphones are processed in the area of a control unit.
  • a microphone is arranged in the area of an ear housing, which communicates with a spatially separated control unit via a transmitter and a receiver.
  • a comparable device is known from DE-OS 35 12 999.
  • a different orientation of the microphones and a subsequent subtraction of the output signals of the microphones from one another should make it possible to eliminate ambient noise that is effective in all listening directions.
  • the transmission element is designed here as a loudspeaker.
  • DE-OS 35 08 830 From DE-OS 35 08 830 it is known, locally separated from a loudspeaker, which is arranged in an ear housing, which in turn can be picked up by a human ear or can be arranged behind a human ear, in the area of a separate control unit, a microphone, a To arrange amplifiers and a power source.
  • This device makes it possible to construct the component to be arranged in the region of the human ear relatively easily.
  • a wireless transmission of signals to a hearing aid is described in DE-OS 30 32 311. In this case, signals to be transmitted wirelessly are provided, which are provided, for example, by a telecommunications system or a radio.
  • Another construction, in which a spatial separation of loudspeaker and control unit is provided, is described in DE-OS 28 44 979.
  • the microphone is arranged in the area of the control unit.
  • a device for hearing support which has two microphones which are coupled to a control unit.
  • the microphones feed the control unit with input signals.
  • the control unit transmits at least one output signal to at least one transmission element.
  • the control unit is spatially separated from the microphones and each of the microphones is accommodated in a housing.
  • One of the transmission elements is arranged in the area of an ear housing.
  • a comparator for evaluating the signals of the microphones is provided in the area of the control unit, which modifies the output power of the control unit to adapt to a sound reproduction.
  • DE 30 27 384 describes a method for reshaping sound signals in which unnatural directional sensations can be converted into more natural hearing sensations by reshaping the directional impressions in the natural hearing sensations.
  • a 1 describes a control unit for directional microphone signals for generating virtual directional characteristics with an adjustable main reception direction.
  • the output signal is multiplied by Evaluation of the input signals with control parameters formed.
  • a microphone system with a variable directional characteristic which has a series of microphones which are arranged at the same distance from one another.
  • the directional characteristic is realized by a special row-like arrangement of the microphones and by using a weighting network with weighting factors.
  • DE 29 28 845 A1 describes an audiovocal integration device which has a microphone which is coupled via a special device to a vibrator which can apply vibrations to the skin of a user.
  • the acoustic as well as the sensitive signal transmission is coordinated via a corresponding control.
  • either devices for hearing support are known in which all components are arranged in the area of the human ear, or in which only one loudspeaker is provided in the case of spatial separation of components in the area of the ear and the other components, in particular the Amplifiers and the microphones are provided in the area of a control unit arranged spatially separate from the loudspeaker.
  • these devices it is not possible in a satisfactory manner to enable a user to have a spatial hearing modeled on the natural hearing sensation and at the same time to suppress interference noises.
  • the object of the present invention is to provide a device of the type mentioned in the introduction construct that both a good acoustic quality is guaranteed and a user experience perceived as pleasant is realized.
  • the analyzer modifies the output power of the control unit to adapt to a spatial sound reproduction, that the output signals of the microphones are evaluated by the analyzer and that an ear amplifier is arranged in the area of at least one of the transmission elements.
  • the sound reception is aligned in different directions in accordance with customary listening habits. In particular, this makes it possible to compensate for noise by targeted directional hearing. It is possible to carry out a central evaluation of the signals from the individual microphones.
  • a useful sound / interference sound selection method can be carried out which, if there is hearing impairment, enables the person concerned to predominantly perceive a sound source which is considered to be dominant by moving the head or making a corresponding setting in the area of the control unit. It does not matter whether the acoustic signals are speech, music or typical background noises. In particular, it is possible to simulate a hearing sensation in a mono-aurally treated hearing impairment that largely corresponds to normal spatial hearing. This results from the fact that the hearing impaired by a movement of his head and by the corresponding signal evaluation can locate a sound source.
  • the arrangement of the microphones in ear housings which can be inserted into the ear and the shifting of all other elements into the area of the spatially separated control unit, creates an optically barely perceptible hearing aid that, with high sound quality, does not limit the appearance of the sound Device equipped people.
  • a particularly high level of user convenience is provided in that a transmission path is provided for data transmission from the transmitters to the receivers. This can be wireless.
  • the transmitters may be connected to the receivers via a line.
  • the comparator be provided with an envelope correlator.
  • Directional hearing can also be improved further by providing the comparator with a time correlator.
  • control unit takes place in that the control unit is arranged in the region of a bracelet that can be worn on a wrist.
  • control unit for manual inputs have an operating unit.
  • a directional microphone is arranged in the area of the control unit.
  • an ear battery is arranged in the area of at least one of the ear housings.
  • a level limiter be provided in the area of the control unit for at least one transmission channel.
  • a sufficient intensity of the signals emitted by the control unit can take place in that a main amplifier is provided in the area of the control unit.
  • Adequate sound energy in the area of the earhousing is provided in that an ear amplifier is arranged in the area of at least one of the transmission elements.
  • the device for hearing support consists of a control unit (1), two microphones (2, 3) and earhouses (4, 5) in which the microphones (2, 3) are installed and which have a shape which makes it possible to arrange the ear housings (4, 5) in the area of an ear cup or an auditory canal of a human ear.
  • Each of the microphones (2, 3) is assigned a transmitter (6) in the area of the ear housings (4, 5), which communicates with a respective receiver (7) in the area of the control unit (1).
  • a transmission element (8) is additionally arranged in the area of each of the earhouses (4, 5), which is connected to a receiver (9) likewise arranged in the area of the earhousing (4, 5).
  • the receivers (9) receive their signals from transmitters (10) which are arranged in the area of the control unit (1).
  • ear amplifiers (11) are arranged in the area of the ear housing (4, 5).
  • the control unit (1) is provided with a comparator (12), which enables the signals from the microphones (2, 3) to be evaluated relative to one another in order to simulate spatial hearing and to suppress noise. If the transmission elements (8) are designed as loudspeakers, level limiters (13) are provided in the control unit (1) in order to limit the sound energy emitted in the region of the loudspeakers.
  • the control unit (1) has a main battery (14) for the energy supply.
  • the ear housings (4, 5) can be provided with ear batteries (15) for supplying energy to the components.
  • the transmission elements (8) can also be designed as electrodes which act electrically on the auditory nerves.
  • control unit (1) The detailed structure of the control unit (1) is shown in FIG. 2.
  • the overall function is monitored by a controller (16).
  • a service unit (17) and a display (18) are further modules
  • Directional microphone (19) and a frequency filter (20) are provided.
  • Level adjustment takes place via a main amplifier (34).
  • predefined tables can be accessed via the controller (16), by means of which the frequency filter (20) and the level limiter (13) can be set.
  • FIG. 3 A schematic diagram to illustrate spatial hearing is shown in FIG. 3.
  • An individual (21) has his ears (22) aligned in a listening direction (23).
  • a sound pulse strikes the ears (22) at different times.
  • Sound pressure profiles (25) thus have a time in the area of the ears (22) offset course and different levels.
  • frontal sound radiation 26
  • the sound pressure profiles (25) in the area of the ears (22) are essentially congruent in time.
  • control unit (1) in the area of a bracelet (27), which in turn can be fastened in the area of a human wrist (28). If space is restricted, it is also possible to mount some of the components of the control unit (1) in the area of links of the bracelet (27).
  • FIG. 5 a circuit variant for an envelope correlation is shown in FIG. 5 and a circuit variant for a time correlation is shown in FIG. 6.
  • the frequency separator (29) has separate outputs (30) assigned to individual frequency ranges. For example, it is possible to assign a separator output to the frequency range from 0 to 0.5 kHz, the next separator output (30) to the frequency range from 0.5 to 1 kHz and the further frequency ranges to additional separator outputs (30).
  • Envelope correlators (31) are used to analyze sound pressure level differences between the microphones (2, 3).
  • a time correlator (32) is used and a coupling takes place according to a bypass via attenuators (33).
  • Both the envelope correlation and the time correlation can be implemented in analog or digital circuitry.
  • a combination of the two methods can improve sound detection.
  • the control unit (1) carried in the area of the wrist (28), it is possible to change the settings made without changing the position of the microphones (2, 3).
  • the ear housings (4, 5) arranged inside the ears (22) need not be accessed.
  • the directional microphone (19) can be positioned by a corresponding movement of a forearm of the individual (21).
  • External audio inputs and audio outputs can also be implemented. With the help of these additional devices, it is possible to generate, send, receive and listen to warning signals or telephone signals.
  • the operating unit (17) in the area of the control unit (1) makes it possible to carry out a predefinable amplification of signals from one of the microphones (2, 3). This allows the user to avoid turning his head in the direction of the desired sound source. It is also possible to use the control unit (17) to adjust the volume, select a microphone or specify a sound group program.
  • the transmitters (6, 10) are implemented, for example, as output amplifiers and the receivers (7, 9) as input amplifiers.
  • a wireless connection standardized and therefore inexpensive radio elements can be used.
  • certain transmission frequencies can be reserved to suppress interference, and it is also possible to provide alternative transmission channels or to provide alternative modulation frequencies.
  • Wireless transmission can also take place via IR or HF signals.
  • the device can be used for various applications. When using the device as a hearing aid already described, it is possible to record the sound via the microphones (2, 3) in the area of the ear housing (4, 5). Alternatively, it is possible to record sound using a microphone arranged in the area of the bracelet (27). Further sound recordings can be made externally, for example via a telephone, a radio, a surveillance microphone, consumer electronics devices, personal computers or alarm detectors.
  • the signal processing takes place in the area of the central unit, which can have the comparator (12), the level limiter (13), the frequency filter (20) and a corresponding amplifier (34).
  • the comparison of the time and level difference between the spectral components of the left and right microphone signals optionally leads to noise suppression.
  • the signal components with time and level difference are not amplified. A user of the device is thus able to primarily perceive the sound source to which he is turning the front of his head.
  • the microphones (2, 3) are arranged inside the auricles, the signals coming from behind are attenuated by the auricle. If the comparator (12) recognizes that signals with time and level differences are almost exclusively present, no noise suppression is carried out. This happens, for example, when a conversation partner sits and talks on the left or right side of the user and a conversation partner sitting opposite is silent. Noise suppression is not carried out when recording sound via the microphone arranged in the area of the bracelet (27) or when recording sound from external audio units.
  • sound is recorded via a microphone in the area of the central unit.
  • the signal processing in the area of the central unit can optionally be used to suppress noise.
  • the sound is reproduced externally, for example via the same device, a telephone, a radio, a personal computer or an alarm detector.
  • the signal transmission between the microphones (2, 3) in the area of the ear housing (4, 5) and the central unit can take place both analog and digital. It is also possible to implement signal processing in analog or digital form. Mixed analog and digital processing is also possible depending on the respective boundary conditions. Analog-to-digital conversions are made in accordance with the processing sequence selected in each case or digital-analog conversions performed. In the case of a partial analog design, particular consideration is given to performing amplification operations analog.
  • the signals picked up by the microphones (2, 3) are digitized and broken down into individual frequency bands.
  • the breakdown can be done, for example, by Fast Fourier Transformations (FFT) or by using filter banks.
  • FFT Fast Fourier Transformations
  • the necessary dynamic corrections are carried out for the individual frequency ranges in accordance with an existing hearing impairment. It is advisable not to exceed a maximum value to ensure sufficient hearing comfort.
  • Dynamic compression takes into account the fact that a dynamic range for normal hearing is within 0 dB to 130 dB. If there is hearing impairment, noises are only perceived from a certain threshold value of the volume. This is also frequency dependent. The dynamic range is limited. If, for example, a linear amplification of all noises is carried out, then amplitudes above the discomfort threshold, for example above a limit value of 130 dB, would have to be cut off. It is therefore cheaper to use the amplitude curve maintain and compress the limited dynamic range.
  • the signal is digitized, it can be determined whether there are reverberation influences and the reverberation effect can be minimized. Digitization enables the signals to be assessed. In addition, it can be determined whether additional amplification of the already amplified signals has been carried out by the amplifier. A time delay of the signal makes it possible to suppress feedback effects that may occur.
  • the improvement of speech intelligibility can be carried out by special algorithms that lead to an increase in speech sharpness.
  • All of the measures described above for influencing the signal can be formulated as algorithms for processing with a digital computer. It is advisable to assign the algorithms to a specific spectral component in order to increase or decrease the dynamic value. After appropriate splitting of the signal into the spectral components and application of the algorithms described, a recombination takes place to form a resulting overall signal. This can be done for example by inverse Fast Fourier Transformation or an inverse filtering corresponding to the initial filtering.

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Telephone Function (AREA)
  • Headphones And Earphones (AREA)

Claims (11)

  1. Appareil d'assistance auditive qui comporte deux microphones (2,3) reliés à une unité de commande et qui alimentent l'unité de commande (1) en signaux d'entrée, appareil dans le cas duquel l'unité de commande (1) transmet au moins un signal de sortie à un élément de transmission au moins et dans le cas duquel l'unité de commande (1) a été prévue espacée des microphones (2,3), de même que dans le cas duquel les microphones (2,3) sont contenus dans des boîtiers d'écouteurs (4,5) qui peuvent être placés chacun dans la région d'une oreille humaine (22) et dans le cas duquel les boîtiers d'écouteurs (4,5) sont munis chacun d'un émetteur (6) qui communique avec un récepteur (7) prévu dans la région de l'unité de commande (1) et dans le cas duquel dans la région de l'un au moins des boîtiers d'écouteurs (4,5) a été prévu l'un des éléments de transmission (8), élément de transmission qui est muni d'un récepteur (9) qui communique avec un émetteur (10) prévu dans la région de l'unité de commande (1), de même que dans le cas duquel, dans la région de l'unité de commande (1), il a été prévu un analyseur (12) destiné à l'appréciation des signaux des microphones (2,3), l'appareil d'audition étant caractérisé en ce que l'analyseur (12) modifie la puissance de sortie de l'unité de commande (1) en vue de l'adaptation à une reproduction du son dans l'espace, en ce que les signaux de sortie des microphones (2,3) sont évalués avec comparaison par l'analyseur (12) et en ce que dans la région d'au moins un des éléments de transmission (8) il a été prévu un amplificateur d'écoute (11).
  2. Appareil suivant la revendication 1, caractérisé en ce que pour la transmission des données des émetteurs (6, 10) aux récepteurs (7,9), il a été prévu une zone de transmission.
  3. Appareil suivant la revendication 1, caractérisé en ce que les émetteurs (6,10) sont reliés aux récepteurs (7,9) par un conducteur.
  4. Appareil suivant l'une quelconque des revendications 1 à 3 caractérisé en ce que l'analyseur (12) est muni d'un corrélateur à enveloppante (31).
  5. Appareil suivant l'une quelconque des revendications 1 à 4 caractérisé en ce que l'analyseur (12) est muni d'un corrélateur de temps (32).
  6. Appareil suivant l'une quelconque des revendications 1 à 5 caractérisé en ce que l'unité de commande (1) est montée dans la région d'un bracelet (27) qui peut être porté au niveau de l'articulation du poignet (28).
  7. Appareil suivant l'une quelconque des revendications 1 à 6, caractérisé en ce que l'unité de commande (1) comporte une unité d'actionnement (17) pour les entrées manuelles.
  8. Appareil suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que dans la région de l'unité de commande (1) il a été prévu un microphone de correction (19).
  9. Appareil suivant l'une quelconque des revendications 1 à 8, caractérisé en ce que dans la région de l'unité de commande (1) il a été prévu, pour au moins un canal de transmission, un limiteur de niveau (13).
  10. Appareil suivant l'une quelconque des revendications 1 à 8, caractérisé en ce que dans la région de l'unité de commande (1) il a été prévu un amplificateur principal (43).
  11. Appareil suivant l'une quelconque des revendications 1 à 10, caractérisé en ce que dans la région de l'un au moins des boîtiers d'écouteurs (4,5), il a été monté une pile d'écoute (15).
EP94120781A 1994-12-27 1994-12-27 Dispositif d'assistance auditive Expired - Lifetime EP0723381B2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59402320T DE59402320D1 (de) 1994-12-27 1994-12-27 Vorrichtung zur Hörunterstützung
AT94120781T ATE151217T1 (de) 1994-12-27 1994-12-27 Vorrichtung zur hörunterstützung
DK94120781T DK0723381T4 (da) 1994-12-27 1994-12-27 Apparat til hørehjælp
EP94120781A EP0723381B2 (fr) 1994-12-27 1994-12-27 Dispositif d'assistance auditive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94120781A EP0723381B2 (fr) 1994-12-27 1994-12-27 Dispositif d'assistance auditive

Publications (3)

Publication Number Publication Date
EP0723381A1 EP0723381A1 (fr) 1996-07-24
EP0723381B1 true EP0723381B1 (fr) 1997-04-02
EP0723381B2 EP0723381B2 (fr) 2001-02-07

Family

ID=8216570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94120781A Expired - Lifetime EP0723381B2 (fr) 1994-12-27 1994-12-27 Dispositif d'assistance auditive

Country Status (4)

Country Link
EP (1) EP0723381B2 (fr)
AT (1) ATE151217T1 (fr)
DE (1) DE59402320D1 (fr)
DK (1) DK0723381T4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10344032A1 (de) * 2003-09-23 2005-06-23 Schlegel, Udo D. Hörsystem verwendbar für schwerhörige Personen
DE102005042430A1 (de) * 2005-09-07 2007-03-08 Fachhochschule Ulm Gehörschutz bei gleichzeitiger Sprachverständlichkeit mit Signalprozessor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2406218A1 (de) * 1974-02-09 1975-08-21 Micro Technic Hueber & Co Hoerhilfsgeraet fuer hoerbehinderte oder schwerhoerige
CA1149050A (fr) * 1980-02-08 1983-06-28 Alfred A.A.A. Tomatis Appareil auditif
EP0298323A1 (fr) * 1987-07-07 1989-01-11 Siemens Aktiengesellschaft Appareil aide ouie
US4887299A (en) * 1987-11-12 1989-12-12 Nicolet Instrument Corporation Adaptive, programmable signal processing hearing aid
US5029216A (en) * 1989-06-09 1991-07-02 The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration Visual aid for the hearing impaired
FR2651634B1 (fr) * 1989-09-06 1996-08-23 France Comte Universite Perfectionnements aux dispositifs de prothese auditive.
DE4327901C1 (de) * 1993-08-19 1995-02-16 Markus Poetsch Vorrichtung zur Hörunterstützung

Also Published As

Publication number Publication date
ATE151217T1 (de) 1997-04-15
DE59402320D1 (de) 1997-05-07
EP0723381A1 (fr) 1996-07-24
EP0723381B2 (fr) 2001-02-07
DK0723381T3 (da) 1997-10-06
DK0723381T4 (da) 2001-06-18

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