EP2373065B1 - Dispositif auditif et procédé de production d'une caractéristique de direction omnidirectionnelle - Google Patents

Dispositif auditif et procédé de production d'une caractéristique de direction omnidirectionnelle Download PDF

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Publication number
EP2373065B1
EP2373065B1 EP11155306.1A EP11155306A EP2373065B1 EP 2373065 B1 EP2373065 B1 EP 2373065B1 EP 11155306 A EP11155306 A EP 11155306A EP 2373065 B1 EP2373065 B1 EP 2373065B1
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EP
European Patent Office
Prior art keywords
microphone
signal
microphones
coupling
directivity
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EP11155306.1A
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German (de)
English (en)
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EP2373065B2 (fr
EP2373065A1 (fr
Inventor
Georg-Erwin Arndt
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Sivantos Pte Ltd
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Sivantos 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
    • H04R25/40—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
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/41—Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest
    • 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
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility

Definitions

  • the invention relates to a hearing device according to the preamble of claim 1.
  • the invention also relates to a method for generating an omnidirectional directional characteristic for such a hearing device.
  • the term hearing device is understood in particular to mean a hearing device.
  • the term includes other portable acoustic devices such as headsets, headphones and the like.
  • Hearing aids are portable hearing aids that are used to care for the hearing impaired.
  • different types of hearing aids such as behind-the-ear hearing aids (BTE), hearing aid with external receiver (RIC: receiver in the canal) and in-the-ear hearing aids (ITE), e.g. Concha hearing aids or canal hearing aids (ITE, CIC).
  • BTE behind-the-ear hearing aids
  • RIC hearing aid with external receiver
  • ITE in-the-ear hearing aids
  • ITE in-the-ear hearing aids
  • ITE in-the-ear hearing aids
  • ITE concha hearing aids or canal hearing aids
  • the hearing aids listed by way of example are worn on the outer ear or in the ear canal.
  • bone conduction hearing aids, implantable or vibrotactile hearing aids are also available on the market. The stimulation of the damaged hearing takes place either mechanically or electrically.
  • Hearing aids have in principle as essential components an input transducer, an amplifier and an output transducer.
  • the input transducer is usually a sound receiver, z. As a microphone, and / or an electromagnetic receiver, for. B. an induction coil.
  • the output transducer is usually used as an electroacoustic transducer, z. As miniature speaker, or as an electromechanical transducer, z. B. bone conduction, realized.
  • the amplifier is usually integrated in a signal processing unit. This basic structure is in FIG. 1 shown using the example of a behind-the-ear hearing aid. In a hearing aid housing 1 for Carrying behind the ear are one or more microphones 2, 2 'installed for receiving the sound from the environment.
  • a signal processing unit 3 which is also integrated in the hearing aid housing 1, processes the microphone signals and amplifies them.
  • the output signal of the signal processing unit 3 is transmitted to a loudspeaker or earpiece 4, which outputs an acoustic signal.
  • the sound is optionally transmitted via a sound tube, which is fixed with an earmold in the ear canal, to the eardrum of the device carrier.
  • the power supply of the hearing device and in particular the signal processing unit 3 is effected by a likewise integrated into the hearing aid housing 1 battery. 5
  • a sound usually produces a microphone signal in both microphones 2, 2 '.
  • the microphone signals differ depending on which direction the sound hits the device.
  • By combining the individual microphone signals into a single signal it is possible to achieve attenuation in the combined signal, which depends on the direction of incidence of the sound.
  • Such directional damping is called directivity or directional characteristic of the microphone assembly.
  • FIG. 2 shows a signal flow graph for a typical processing of microphone signals, as it can be performed to produce such a directivity by a corresponding device 10.
  • the device 10 comprises delay elements 20, 22. With a delay element, it is possible to generate an output signal which is modified with respect to an input signal in such a way that it would cause a delay of the signal by a time duration ⁇ i . This can be effected, for example, by changing a phase of spectral components of the signal.
  • the delay ⁇ i for example, to a Duration must be set, which requires a sound to overcome the distance 36 of the microphones 2, 2 '.
  • the device 10 further comprises adders 24, 26, 28 for superimposing two signals each.
  • An input signal of a summer can be inverted before the overlay. In FIG. 2 such an inversion is indicated by a minus sign.
  • the device 10 comprises a multiplier 30 for scaling a signal. In the multiplier 30, the signal is multiplied by the factor a.
  • the output signal generated by the device 10 can be forwarded via an output 32 to a downstream device. This may be, for example, a digital-to-analog converter, which generates an analog signal for a listener, such as the handset 4.
  • a cardioid branch 34 the signals of the microphones 2 and 2 'are processed such that a signal results at the adder 28 in which a direction-dependent attenuation results in a cardioid-shaped directional characteristic of the arrangement the microphones 2 and 2 'results.
  • a cardioid directional characteristic is typical of a first order differential microphone arrangement.
  • the cardioid directional characteristic is here oriented such that a signal of a sound propagating along a direction 38 is attenuated least. In the event that a user in the FIG. 1 worn hearing aid, the direction 38 corresponds to that of a sound that hits the front of the user from the front.
  • an anti-cardioid branch 40 effects a directional characteristic of an anti-cardioid. This means that a sound coming from the direction 38 on the front of the user is attenuated the most. On the other hand, a sound which propagates counter to the direction 38, that is to say hits the user from behind, produces the clearest signal in the branch 40.
  • Changing a directional characteristic in the device 10 between a cardioid directional characteristic and an omnidirectional directional characteristic may be very important to a user of a hearing aid.
  • a directional sound detection is preferably desired. If, on the other hand, it is important to be able to perceive sounds from all directions, it may be desirable for a user to be able to set an omnidirectional directional characteristic.
  • a microphone system with the in FIG. 2 shown construction is z. B. from the WO 2004/057914 A1 known.
  • a method for operating a hearing aid in which different directional characteristics are adjustable.
  • the hearing aid has three microphones, which are connected in pairs to directional microphones of the first order. From two microphone units with directional characteristics of the first order then a microphone unit is formed with directivity second order.
  • a hearing system in which a noise reduction based on an adaptive filter unit is made possible.
  • the adaptive filter unit has a first input for a noisy useful signal and a second input for an estimate of the interference signal.
  • the input for the noisy useful signal can be coupled with different microphone devices.
  • the input for the interference signal can be coupled by means of the switching device with one of the microphone devices.
  • the adaptive filter unit scales the interference signal and subtracts it from the noisy useful signal in order to obtain an improved useful signal.
  • the object is achieved by a hearing device according to claim 1. It is also achieved by a method for generating an omnidirectional directional characteristic according to claim 8. Advantageous developments of the hearing device according to the invention are given by the dependent claims.
  • the hearing device has a microphone arrangement of at least a first and a second microphone and a device for generating a directivity of the microphone arrangement.
  • the first microphone may be coupled to a first input of the device and the second microphone coupled to a second input of the device.
  • the means for coupling are designed such that the first microphone can be coupled to both inputs at the same time.
  • the microphone arrangement may comprise more than two microphones.
  • the means for coupling are configured to couple each of the microphones to a respective input of the device.
  • the means for coupling are additionally designed to also couple the second microphone with both inputs. This results in the advantage that the omnidirectional directivity can be effected either with the first or with the second microphone. Depending on which of the two microphones is covered, for example, by hair, then the other microphone can be used. Furthermore, it is possible to continuously vary between a directional characteristic with a high directivity, i. a pronounced directional selectivity, and the omnidirectional directional characteristic overlap.
  • the phases of the signals in individual channels of an analysis-synthesis filter bank arrangement are always changed in the same way by the device for generating the directivity. It is thus possible to provide omnidirectional sound detection in one channel and directional sound detection in, for example, a spectrally adjacent channel.
  • the phase of the microphone signal is also changed by the means for generating the directivity, it is ensured that the individual channels can be combined artifact-free in the synthesis filter bank.
  • the means for coupling it is preferably made possible to selectively interrupt a signal path from the second microphone to the device for generating the directional characteristic. Then there is no disturbance of the microphone signal of the first microphone by an overlay with the microphone signal of the second microphone.
  • the interruption is optional, i. the second microphone can be coupled to generate a directional characteristic at any time again with the device.
  • the means for coupling comprise a delay element, via which the first microphone can be coupled to the second input.
  • a particular advantage results when the delay element is a part of the device itself. Then, no additional delay element needs to be provided, but a delay element already provided by the device for generating the directivity is used. This results in a particularly easy to implement hearing device according to the invention.
  • the means for coupling preferably comprise at least one means for multiplying an amplitude of a microphone signal by a weighting factor.
  • the weighting factor can also be a complex number.
  • This combination of the weighting factors has the advantage that for effecting an omnidirectional directional characteristic, a component the respective microphone signals in an output signal of the device can be changed continuously, without causing unwanted side effects or artifacts. Such a side effect may be, for example, an undesirably loud output signal at the output of the device.
  • the hearing device according to the invention is also developed in an advantageous manner, when the means for coupling a weighting of an amplitude of a microphone signal and / or a delay of the microphone signal is a function of a frequency of the microphone signal.
  • This has the advantage that a ratio of a distance of the microphones to a wavelength of a sound can be taken into account by which the microphone signals are caused.
  • the invention also includes a method for generating an omnidirectional directional characteristic for a hearing device.
  • the method is suitable for such a hearing device, in which microphones of a microphone arrangement can be coupled to respective inputs of a device for generating a directivity of the microphone arrangement.
  • the device therefore has a separate input for each of the microphones, via which a microphone signal can be received by the device.
  • two of the microphones are respectively coupled to at least two of the inputs of the device for generating an omnidirectional directional characteristic.
  • the advantage is achieved that an omnidirectional directivity based on a microphone signal can be generated only one of the microphones.
  • the method according to the invention can be developed in accordance with the already described developments of the hearing device according to the invention. Then there are the corresponding further advantages.
  • FIG. 3 shows a signal flow graph for signal processing, which can be performed in a hearing aid, such as a behind-the-ear hearing aid.
  • the hearing aid has an arrangement of two microphones 2, 2 ', which in their operation in the Figures 1 and 2 correspond represented microphones. Because of this, are in FIG. 3 the microphones 2 and 2 'provided with the same reference numerals. In the FIG. 3 shown microphones 2, 2 'may be microphones without their own directional characteristic, ie a sound then causes in each of the microphones 2, 2' a microphone signal which is independent of a direction from which the sound hits the respective microphone.
  • the hearing aid also has a device 10 for generating a directivity of the arrangement of the two microphones 2 and 2 '.
  • the device 10 may be provided, for example, as a signal processing program in the signal processing unit of the hearing device.
  • the device 10 corresponds in its operation in connection with FIG. 2 explained device. Because of this, are in FIG. 3 Elements, what elements the in FIG. 2 correspond to the device shown, with the same reference numerals as in FIG. 2 Mistake.
  • the means 42 comprise summers 44, 46 and multipliers 48, 50, 52, 54.
  • the microphone 2 is coupled to the summer 44 via the multiplier 48. With the multiplier 48, the microphone signal of the microphone 2 can be weighted with a weighting factor b.
  • the summer 44 is coupled to the input 12 of the device 10.
  • the means 42 also comprise the delay element 20 of the device 10.
  • An output of the delay element 20 is coupled to the summer 46 via the multiplier 54.
  • the multiplier 54 By the multiplier 54, the output signal of the delay element 20 is weighted with a weighting factor e.
  • the summer 46 is coupled to input 14 of the device 10.
  • the means 42 may each comprise a plurality of further elements, which in FIG. 3 are not shown in detail.
  • they may each comprise a microphone preamplifier and an analog-to-digital converter.
  • the means 42 make it possible, by adjusting the factors b, c, d and e, to produce an omnidirectional directional characteristic of the arrangement of the microphones 2, 2 '.
  • the following settings are possible:
  • the microphone 2 is coupled to both inputs 12, 14. It is directly coupled to the input 12. With the input 14, the microphone 2 is coupled via the delay element 20. The microphone 2 ', however, is not coupled to the device 10.
  • the delay ⁇ i of the delay element 20 may correspond to a transit time of a sound signal between the two microphones 2 and 2 '. Then there is a delay of the signals at the two inputs 12 and 14, as it also results when the in FIG. 2 shown microphone assembly, a sound signal from the direction 38 hits the microphone assembly.
  • both the signal at the input 12 and the signal 14 at the setting 1 on the microphone signal of the microphone 2 is based. This is for example advantageous if the hearing aid is slipped on the ear of a user and thus the microphone 2 'is shaded , In such a case, an omnidirectional directivity with the device 10 alone can no longer be effected.
  • an omnidirectional directivity can be provided.
  • the factors b, c, d and e can be set to any desired values.
  • the factor a can also be set to values other than zero and one.
  • an adjustment of the values can be done automatically depending on environmental parameters.
  • the factors of the multipliers are then adjusted adaptively, e.g. depending on other control parameters during operation of the hearing aid.
  • the delay ⁇ i and the factors a, b, c, d and e may be used as a function be provided a frequency. This results in a correspondingly different processing for signal components of different frequencies.
  • adjustable coupling of the microphones with the inputs of the device 10 can provide an omnidirectional directivity in a particularly reliable manner. But also a conventional processing of the signals is possible.
  • Frequency-dependent processing can be enabled, for example, by subband processing, in which the microphone signals are broken down into individual frequency channels.
  • means 10 for generating a directional effect may also have a different arrangement of delay elements, summers and multipliers as well as further elements. Then, directional characteristics other than a cardioid directivity can be generated.

Claims (8)

  1. Ensemble d'audition présentant :
    un agencement de microphones constitué d'au moins un premier microphone (2) et d'un deuxième microphone (2'),
    un dispositif (10) qui exerce un effet directionnel sur l'agencement de microphones,
    des moyens (42) qui raccordent le premier microphone (2) à une première entrée (12) du dispositif (10) et qui raccordent le deuxième microphone (2') à une deuxième entrée (14) du dispositif (10),
    les moyens (42) de raccordement étant conçus pour raccorder également le premier microphone (2) aux deux entrées (12, 14) du dispositif (10),
    caractérisé en ce que
    les moyens (42) de raccordement sont conçus pour raccorder également le deuxième microphone (2') aux deux entrées (12, 14).
  2. Ensemble d'audition selon la revendication 1, caractérisé en ce que les moyens (42) de raccordement permettent d'interrompre sélectivement un parcours de signalisation allant du deuxième microphone (2') au dispositif (10) pour former une caractéristique directionnelle.
  3. Ensemble d'audition selon les revendications 1 ou 2, caractérisé en ce que les moyens (42) de raccordement comprennent un élément de ralentissement (20) par lequel le premier microphone (2) peut être raccordé à la deuxième entrée (14).
  4. Ensemble d'audition selon la revendication 3, caractérisé en ce que l'élément de ralentissement (20) fait partie du dispositif (10) de formation d'un effet directionnel.
  5. Ensemble d'audition selon l'une des revendications précédentes, caractérisé en ce que les moyens (42) de raccordement présentent au moins un dispositif (48, 50, 52, 54) de multiplication par un facteur de pondération (b, c, d, e) de l'amplitude des signaux de microphone.
  6. Ensemble d'audition selon la revendication 5, caractérisé en ce que les moyens (42) de raccordement sont conçus pour pondérer un signal du premier microphone (2) par un facteur de pondération b, 0 < b < 1, et un signal du deuxième microphone (2') par un facteur de pondération c, c = 1 - b.
  7. Ensemble d'audition selon l'une des revendications précédentes, caractérisé en ce que pour les moyens de raccordement, une pondération de l'amplitude d'un signal de microphone et/ou un ralentissement du signal de microphone sont une fonction de la fréquence du signal de microphone.
  8. Procédé de formation d'une caractéristique directionnelle omnidirectionnelle pour un ensemble d'audition, dans lequel des microphones (2, 2') d'un agencement de microphones peuvent être raccordés à des entrées respectives (12, 14) d'un dispositif (10) de formation d'un effet directionnel de l'agencement de microphones,
    caractérisé en ce que
    deux des microphones (2, 2') sont raccordés chacun à au moins deux des entrées (12, 14) du dispositif (10).
EP11155306.1A 2010-03-17 2011-02-22 Dispositif auditif et procédé de production d'une caractéristique de direction omnidirectionnelle Active EP2373065B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010011730A DE102010011730A1 (de) 2010-03-17 2010-03-17 Hörvorrichtung und Verfahren zum Erzeugen einer omnidirektionalen Richtcharakteristik

Publications (3)

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EP2373065A1 EP2373065A1 (fr) 2011-10-05
EP2373065B1 true EP2373065B1 (fr) 2016-01-13
EP2373065B2 EP2373065B2 (fr) 2018-10-03

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US (1) US8477974B2 (fr)
EP (1) EP2373065B2 (fr)
DE (1) DE102010011730A1 (fr)
DK (1) DK2373065T4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010011730A1 (de) † 2010-03-17 2011-11-17 Siemens Medical Instruments Pte. Ltd. Hörvorrichtung und Verfahren zum Erzeugen einer omnidirektionalen Richtcharakteristik
DE102019205709B3 (de) * 2019-04-18 2020-07-09 Sivantos Pte. Ltd. Verfahren zur direktionalen Signalverarbeitung für ein Hörgerät

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5757933A (en) 1996-12-11 1998-05-26 Micro Ear Technology, Inc. In-the-ear hearing aid with directional microphone system
WO2001001731A1 (fr) 1999-06-24 2001-01-04 Widex A/S Procede de commande de la directionalite de la caracteristique de reception de son d'une aide auditive, et aide auditive dans laquelle est applique ledit procede
WO2004057914A1 (fr) 2002-12-20 2004-07-08 Oticon A/S Systeme de microphone a reponse directionnelle
EP1489882A2 (fr) 2003-06-20 2004-12-22 Siemens Audiologische Technik GmbH Procédé pour l'opération d'une prothèse auditive aussi qu'une prothèse auditive avec un système de microphone dans lequel des diagrammes de rayonnement différents sont sélectionnables.
US20050008166A1 (en) 2003-06-20 2005-01-13 Eghart Fischer Hearing aid, method, and programmer for adjusting the directional characteristic dependent on the rest hearing threshold or masking threshold
WO2007137364A1 (fr) 2006-06-01 2007-12-06 Hearworks Pty Ltd Procédé et système pour améliorer l'intelligibilité de sons
WO2008071236A2 (fr) 2006-12-15 2008-06-19 Phonak Ag Système auditif à suppression de bruit améliorée
EP2182739A1 (fr) 2008-11-04 2010-05-05 Siemens Medical Instruments Pte. Ltd. Système de microphone adaptatif pour un appareil auditif et procédé correspondant destiné au fonctionnement
EP2200346A2 (fr) 2008-12-22 2010-06-23 Siemens Medical Instruments Pte. Ltd. Prothèse auditive avec commutation automatique à algorithme

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010011730A1 (de) † 2010-03-17 2011-11-17 Siemens Medical Instruments Pte. Ltd. Hörvorrichtung und Verfahren zum Erzeugen einer omnidirektionalen Richtcharakteristik

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5757933A (en) 1996-12-11 1998-05-26 Micro Ear Technology, Inc. In-the-ear hearing aid with directional microphone system
US6389142B1 (en) 1996-12-11 2002-05-14 Micro Ear Technology In-the-ear hearing aid with directional microphone system
WO2001001731A1 (fr) 1999-06-24 2001-01-04 Widex A/S Procede de commande de la directionalite de la caracteristique de reception de son d'une aide auditive, et aide auditive dans laquelle est applique ledit procede
WO2004057914A1 (fr) 2002-12-20 2004-07-08 Oticon A/S Systeme de microphone a reponse directionnelle
EP1489882A2 (fr) 2003-06-20 2004-12-22 Siemens Audiologische Technik GmbH Procédé pour l'opération d'une prothèse auditive aussi qu'une prothèse auditive avec un système de microphone dans lequel des diagrammes de rayonnement différents sont sélectionnables.
US20050008166A1 (en) 2003-06-20 2005-01-13 Eghart Fischer Hearing aid, method, and programmer for adjusting the directional characteristic dependent on the rest hearing threshold or masking threshold
WO2007137364A1 (fr) 2006-06-01 2007-12-06 Hearworks Pty Ltd Procédé et système pour améliorer l'intelligibilité de sons
WO2008071236A2 (fr) 2006-12-15 2008-06-19 Phonak Ag Système auditif à suppression de bruit améliorée
EP2182739A1 (fr) 2008-11-04 2010-05-05 Siemens Medical Instruments Pte. Ltd. Système de microphone adaptatif pour un appareil auditif et procédé correspondant destiné au fonctionnement
EP2200346A2 (fr) 2008-12-22 2010-06-23 Siemens Medical Instruments Pte. Ltd. Prothèse auditive avec commutation automatique à algorithme

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Multimicrophone adaptive beamforming for interference reduction in hearing aids", JOURNAL OF REHABILITATION RESEARCH AND DEVELOPMENT, vol. 24, no. 4, 1987, pages 103 - 110

Also Published As

Publication number Publication date
DE102010011730A1 (de) 2011-11-17
EP2373065B2 (fr) 2018-10-03
US20110228961A1 (en) 2011-09-22
DK2373065T4 (da) 2019-01-21
DK2373065T3 (da) 2016-04-18
EP2373065A1 (fr) 2011-10-05
US8477974B2 (en) 2013-07-02

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