EP2169984A2 - Prothèse auditive avec système de microphone directif et procédé de fonctionnement d'une telle prothèse auditive - Google Patents

Prothèse auditive avec système de microphone directif et procédé de fonctionnement d'une telle prothèse auditive Download PDF

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Publication number
EP2169984A2
EP2169984A2 EP09170157A EP09170157A EP2169984A2 EP 2169984 A2 EP2169984 A2 EP 2169984A2 EP 09170157 A EP09170157 A EP 09170157A EP 09170157 A EP09170157 A EP 09170157A EP 2169984 A2 EP2169984 A2 EP 2169984A2
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EP
European Patent Office
Prior art keywords
directivity
hearing aid
gain
signal
function
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.)
Granted
Application number
EP09170157A
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German (de)
English (en)
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EP2169984A3 (fr
EP2169984B1 (fr
Inventor
Herve Schulz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sivantos Pte Ltd
Original Assignee
Siemens Medical Instruments Pte Ltd
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Publication of EP2169984A2 publication Critical patent/EP2169984A2/fr
Publication of EP2169984A3 publication Critical patent/EP2169984A3/fr
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Publication of EP2169984B1 publication Critical patent/EP2169984B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—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
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically

Definitions

  • the invention relates to a hearing aid and a method for operating a hearing aid with a directional microphone system for receiving an acoustic input signal and generating at least one electrical microphone signal, a signal processing unit for processing and amplifying the electrical microphone signal and generating an electrical output signal and a receiver for converting the electrical output signal in an acoustic output signal, wherein in the directional microphone system different directional effects are adjustable and wherein the gain is adjustable in dependence on the result of an analysis of the microphone signal.
  • an input signal is recorded by means of an input transducer and converted into an electrical input signal.
  • an input transducer usually serves as an input transducer at least one microphone which receives an acoustic input signal and converts it into an electrical input signal.
  • Modern hearing aids often comprise a directional microphone system with a plurality of microphones in order to achieve a direction dependent on the direction of arrival of acoustic signals reception, a directional characteristic.
  • telephone coils or antennas for receiving electromagnetic input signals and conversion to electrical input signals are also common as input transducers.
  • the input signals converted by the input transducer into electrical input signals are fed to a signal processing unit for further processing and amplification.
  • the further processing and amplification takes place to compensate for the individual hearing loss of a user usually in response to the signal frequency of the input signal.
  • the signal processing unit supplies at its output an electrical output signal, which via at least one output transducer the hearing of the hearing aid wearer is supplied so that it perceives the output signal as an acoustic signal.
  • output transducers usually listeners are used, which generate an acoustic output signal.
  • output transducers for generating mechanical vibrations are also known which directly excite certain parts of the ear, such as the ossicles, to vibrate.
  • output transducers are known which directly stimulate neurons of the ear.
  • a hearing aid further includes a voltage source (battery or rechargeable battery) for powering the electronic components.
  • controls on / off switch, program switch, volume control, etc. may be present.
  • the classification may include u.a. Influence on the amplification of the electrical input signal, the operation of noise canceling algorithms or on the directional microphone system.
  • the classification may include u.a. Influence on the amplification of the electrical input signal, the operation of noise canceling algorithms or on the directional microphone system.
  • a hearing aid is known with a directional microphone system comprising a plurality of electrically interconnected omnidirectional microphones and in which different directivity can be adjusted.
  • the sound quality is to be improved, in particular in a quiet, listening environment.
  • it is proposed to increase the signal delay in at least one microphone signal such that an increase in the transfer function in the frequency response of the microphone system takes place, which also improves the signal-to-noise ratio by reducing the proportion of microphone noise in the microphone output signal.
  • the hearing aid professional is known that a hearing aid tends to tend to feedback at a very high gain, if in the directional microphone system used a high degree of directivity is set. Therefore, at very high gains (e.g., greater than 100 dB), the directional microphone system is used only in omnidirectional operation, i. without directivity.
  • very high gains e.g., greater than 100 dB
  • the directional microphone system is used only in omnidirectional operation, i. without directivity.
  • adjustment of the directivity has hitherto been carried out as a function of the signal level of the acoustic input signal.
  • the maximum directivity of the directional microphone system used was allowed only above a certain signal level of the acoustic input signal, or, if a high degree of directivity was required even at a lower signal level of the acoustic input signal, the gain correspondingly decreased.
  • the maximum possible directivity was determined by the signal level of the acoustic input signal.
  • the object of the present invention is always to provide the hearing aid wearer with the greatest possible degree of reinforcement and directivity.
  • This object is achieved by a hearing aid with the features of claim 1. Furthermore, the object is achieved by a method for operating a hearing aid with the method steps according to claim 5.
  • the invention has the advantage that the greatest possible degree of directivity, in particular with a high gain of the acoustic input signal by the hearing aid, is no longer directly coupled to the signal level of the input signal. Rather, the greatest possible degree of directivity in the hearing aid according to the invention now depends directly on the set gain.
  • the difference to the previous procedure is particularly clear when the hearing aid adjusts only a relatively low gain despite a relatively quiet acoustic input signal, which would actually require a high gain. This is e.g. then the case when the classifier recognizes that in the acoustic input signal no or only a small useful signal component is present and thus is at least predominantly an interference signal in the input signal. In this case, it makes no sense if the hearing aid selects a high gain.
  • the hearing aid device retains the highest possible directivity in the directional microphone system used, especially in a hearing situation with a high interference signal component.
  • the greatest possible degree of directivity for a particular hearing situation no longer depends on the level of the acoustic input signal, but directly on the set gain. This fully exploits the technical possibilities of the hearing aid in question.
  • a function is stored in the hearing aid, which determines the dependence of the directivity of the gain.
  • this is a threshold value of the amplification above which an omnidirectional (and therefore no) directivity is always set.
  • a directional microphone system comprising more than two microphones
  • higher order directivity effects can be realized, e.g. in a directional microphone system with three omnidirectional microphones directional effects of first and second order.
  • two gain thresholds can be set, with the hearing aid concerned automatically a second order directivity at a gain below the lower threshold, a first order directivity at a gain between the two thresholds, and a directivity at a gain above the upper threshold zeroth order chooses.
  • This procedure can in principle be extended to directional microphone systems with an arbitrary number of microphones and thus arbitrary order of directivity.
  • the selected according to the invention the relationship between the directivity and the gain only the greatest possible degree of directivity at the respective gain.
  • This relationship can be determined, for example, by laboratory experiments, so that a stable operation of the respective hearing aid device is always ensured in the directivity associated with the respective amplification.
  • a smaller than the largest possible directivity can always be set in the respective gain. Detects the hearing aid by an analysis of one or more microphone signals or from these signals, for example, that in the current hearing situation, a directivity is not required is, then automatically no or a lower than the maximum directivity at the instantaneous gain can be set.
  • the invention has hitherto been explained for the complete frequency spectrum which can be transmitted with the relevant hearing aid device.
  • the signal processing usually takes place in parallel within individual frequency bands, the so-called channels. Both the setting of the gain and the directivity between the individual channels can vary.
  • the considerations explained so far with reference to a frequency band can also be applied to a number of parallel frequency bands.
  • FIG. 1 shows a highly simplified block diagram of a hearing aid 1 with three microphones M1, M2 and M3, which receive an acoustic input signal and generate three electrical microphone signals S1, S2 and S3.
  • the microphone interconnection unit 4 delivers at its output a directional microphone signal R, which is for further processing and frequency-dependent amplification of a signal processing unit 2 is supplied.
  • the processed and amplified directional microphone signal is finally converted by an earphone 3 into an acoustic output signal and supplied to the hearing of a user of the hearing aid device 1.
  • the hearing aid 1 is manually (by manual program switching) and automatically adaptable to different listening situations.
  • the adaptation takes place in particular by setting parameters which determine the signal processing in the signal processing unit 2.
  • an analysis of the microphone signals S1, S2 and S3 takes place in an analysis and control unit 6.
  • the hearing situation in which the relevant hearing aid device 1 is currently located is automatically recognized and suitable Parameter settings determined and set in the signal processing unit 2.
  • the amount of amplification of an acoustic input signal is determined by the hearing aid 1, wherein in addition to the signal analysis also other factors can influence the gain, such as a manual volume adjustment, which the user makes, for example by means of a remote control on the hearing aid 1.
  • a further automatic adaptation of the hearing aid device 1 to the current hearing situation concerns the directional microphone system.
  • the control takes place on the basis of a signal analysis of the microphone signals S1, S2 and S3, which takes place in a directional microphone control unit 5 for this purpose.
  • the interference signal component and the directions of incidence of acoustic signals in the directional microphone system determine the directivity, which is then adjusted by means of the microphone circuit unit 4.
  • the diagrams only give the maximum possible directional effect as a function of the amplification, in which a stable operation of the relevant hearing aid device is ensured.
  • a lower directivity can be set.
  • FIG. 3 Another example of a variety of possible functions shows FIG. 3 , Also, a directivity index RI is plotted against the gain V. A difference from the example according to FIG. 2 results in the range between the threshold values V1 and V2, wherein here a linear decrease of the directivity of a directional characteristic of the second order to a directional characteristic of zero order is given.
  • Such a connection can be achieved, for example, by a targeted control of the time constants in the microphone interconnection unit 4 FIG. 1 be achieved.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic System (AREA)
EP09170157.3A 2008-09-26 2009-09-14 Prothèse auditive avec système de microphone directif et procédé de fonctionnement d'une telle prothèse auditive Active EP2169984B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008049086A DE102008049086B4 (de) 2008-09-26 2008-09-26 Hörhilfegerät mit einem Richtmikrofonsystem sowie Verfahren zum Betrieb eines derartigen Hörhilfegerätes

Publications (3)

Publication Number Publication Date
EP2169984A2 true EP2169984A2 (fr) 2010-03-31
EP2169984A3 EP2169984A3 (fr) 2012-05-30
EP2169984B1 EP2169984B1 (fr) 2019-05-22

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EP09170157.3A Active EP2169984B1 (fr) 2008-09-26 2009-09-14 Prothèse auditive avec système de microphone directif et procédé de fonctionnement d'une telle prothèse auditive

Country Status (4)

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US (1) US20100080407A1 (fr)
EP (1) EP2169984B1 (fr)
DE (1) DE102008049086B4 (fr)
DK (1) DK2169984T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009143434A2 (fr) * 2008-05-23 2009-11-26 Analog Devices, Inc. Microphone à large gamme dynamique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10331956B3 (de) 2003-07-16 2005-01-27 Siemens Audiologische Technik Gmbh Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteistiken einstellbar sind

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
WO2000076268A2 (fr) * 1999-06-02 2000-12-14 Siemens Audiologische Technik Gmbh Prothese auditive a systeme de microphone directionnel et procede permettant de faire fonctionner ladite prothese
US7471798B2 (en) * 2000-09-29 2008-12-30 Knowles Electronics, Llc Microphone array having a second order directional pattern
DE10131964B4 (de) * 2001-07-02 2005-11-03 Siemens Audiologische Technik Gmbh Verfahren zum Betrieb eines digitalen programmierbaren Hörgerätes sowie digitales programmierbares Hörgerät
US7457426B2 (en) * 2002-06-14 2008-11-25 Phonak Ag Method to operate a hearing device and arrangement with a hearing device
DE10310579B4 (de) * 2003-03-11 2005-06-16 Siemens Audiologische Technik Gmbh Automatischer Mikrofonabgleich bei einem Richtmikrofonsystem mit wenigstens drei Mikrofonen
DE10327889B3 (de) * 2003-06-20 2004-09-16 Siemens Audiologische Technik Gmbh Verfahren zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteristiken einstellbar sind und Programmiergerät dafür
EP1489882A3 (fr) * 2003-06-20 2009-07-29 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.
US7324651B2 (en) * 2004-03-15 2008-01-29 Phonak Ag Feedback suppression
EP1469702B1 (fr) * 2004-03-15 2016-11-23 Sonova AG Suppression de la réaction acoustique
EP1827058A1 (fr) * 2006-02-22 2007-08-29 Oticon A/S Appareil acoustique avec une transition graduelle entre des modes d'opération d'une prothèse auditive
US7869606B2 (en) * 2006-03-29 2011-01-11 Phonak Ag Automatically modifiable hearing aid
ATE501604T1 (de) * 2007-10-16 2011-03-15 Phonak Ag Hörsystem und verfahren zum betrieb eines hörsystems
DE102008055760A1 (de) * 2008-11-04 2010-05-20 Siemens Medical Instruments Pte. Ltd. Adaptives Mikrofonsystem für ein Hörgerät und zugehöriges Verfahren zum Betrieb
DE102008064484B4 (de) * 2008-12-22 2012-01-19 Siemens Medical Instruments Pte. Ltd. Verfahren zum Auswählen einer Vorzugsrichtung eines Richtmikrofons und entsprechende Hörvorrichtung

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
DE10331956B3 (de) 2003-07-16 2005-01-27 Siemens Audiologische Technik Gmbh Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteistiken einstellbar sind

Also Published As

Publication number Publication date
EP2169984A3 (fr) 2012-05-30
DE102008049086A1 (de) 2010-04-08
DK2169984T3 (da) 2019-08-26
US20100080407A1 (en) 2010-04-01
EP2169984B1 (fr) 2019-05-22
DE102008049086B4 (de) 2011-12-15

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