EP1489884B1 - Procédé de commande d'une prothèse auditive et prothèse auditive avec système de microphone dans lequel différentes caractéristiques directionnelles sont réglables - Google Patents

Procédé de commande d'une prothèse auditive et prothèse auditive avec système de microphone dans lequel différentes caractéristiques directionnelles sont réglables Download PDF

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Publication number
EP1489884B1
EP1489884B1 EP04013165A EP04013165A EP1489884B1 EP 1489884 B1 EP1489884 B1 EP 1489884B1 EP 04013165 A EP04013165 A EP 04013165A EP 04013165 A EP04013165 A EP 04013165A EP 1489884 B1 EP1489884 B1 EP 1489884B1
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EP
European Patent Office
Prior art keywords
microphone
signal
hearing aid
signal level
directional
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Expired - Lifetime
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EP04013165A
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German (de)
English (en)
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EP1489884A2 (fr
EP1489884A3 (fr
Inventor
Eghart Fischer
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Sivantos GmbH
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Siemens Audioligische Technik GmbH
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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
    • H04R25/43—Electronic input selection or mixing based on input signal analysis, e.g. mixing or selection between microphone and telecoil or between microphones with different directivity characteristics
    • 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
    • H04R2410/00—Microphones
    • H04R2410/01—Noise reduction using microphones having different directional characteristics

Definitions

  • the invention relates to a method for operating a hearing aid with a microphone system, a signal processing unit and an output transducer, wherein the microphone system comprises at least two microphone units from which emit microphone signals and the directional characteristics of different order, and wherein the directional characteristic of the microphone system during operation of the hearing aid changed is. Furthermore, the invention relates to a hearing aid for performing the method.
  • the transmission parameters of the hearing aid are automatically varied.
  • the classification may have an influence on the mode of operation of noise suppression algorithms as well as on the microphone system.
  • an omnidirectional directional characteristic directional characteristic of zero order
  • a clear directivity of the microphone system directivity of the first or higher order.
  • To generate the directional characteristic gradient microphones are used or interconnected several omnidirectional microphones with each other.
  • Such microphone systems show a frequency-dependent transmission behavior, in which a significant drop to low frequencies is recorded.
  • the noise behavior of the microphones is independent of frequency and slightly amplified compared to an omnidirectional microphone.
  • the high-pass frequency response of the microphone system must be balanced by amplifying the low frequencies.
  • the noise in the low frequency range is also amplified and, under certain circumstances, clearly and disturbingly audible, while quiet noises are obscured by the noise.
  • a hearing aid with at least two microphones for forming a directional microphone system known.
  • characteristic values of the signals of both microphones are detected via a comparison element, a control element and an adjusting element and adjusted to one another in case of deviation.
  • a hearing aid is known with a signal processing unit and at least two microphones, which are interconnected to form directional microphone systems of different order, the directional microphone systems in turn are interconnected in dependent on the frequency of the votes of the microphones microphone signals weighting.
  • the cut-off frequency between adjacent frequency bands, in which a different weighting of the microphone signals is provided can be set.
  • From the EP 0 942 627 A2 is a hearing aid with directional microphone system with a signal processing device, a handset and a plurality of microphones known whose output signals for generating an individual directional microphone characteristic via delay means and the signal processing means in different weighting are interconnected.
  • the preferred direction of reception (main direction) can be set individually in adaptation to a present hearing situation.
  • a hearing aid with an omnidirectional microphone and a directional microphone first or higher order known.
  • the microphone signal of the directional Microphones are amplified in the range of low signal frequencies in amplitude and matched to the microphone signal of the omnidirectional microphone.
  • an equalizer is provided in the microphone signal path of the directional microphone, which raises the microphone signal in the lower frequency range.
  • Both the microphone signal of the omnidirectional microphone and the microphone signal of the directional microphone are finally fed to a switching unit. In a first switching position of the switching unit, the omnidirectional microphone and in a second switching position of the switching unit, the directional microphone is connected to a hearing aid amplifier.
  • the switching unit can automatically switch depending on the signal level of a microphone signal.
  • a disadvantage of the known hearing aid devices with a directional microphone system is that when switching between different directional characteristics of the microphone system or in a rapid transition from a directional characteristic to another level jumps and thus artefacts are caused.
  • the object of the present invention is to avoid artifacts in a hearing aid with rapid changes in the directional characteristic of the microphone system.
  • This object is achieved in a method for operating a hearing aid with a microphone system, a signal processing unit and an output transducer, wherein the microphone system comprises at least two microphone units from which emit microphone signals and the directional characteristics of different order, and wherein the directional characteristic of the microphone system during operation of the hearing aid can be changed, achieved by microphone units outgoing with directional characteristics of different order outgoing microphone signals are adjusted in their signal levels, wherein at least one microphone unit, the signal level of the microphone unit outgoing microphone signal is equalized to the signal level of a reference signal.
  • the object is in a hearing aid for performing the method with a microphone system, a signal processing unit and an output transducer, wherein the microphone system comprises at least two microphone units from which emit microphone signals and the directional characteristics have different order, and wherein the directional characteristic of the microphone system during operation of the Hearing aid device is variable, solved by means for equalizing the signal level of at least one outgoing microphone unit of a microphone signal to the signal level of a reference signal.
  • the hearing aid according to the invention comprises a microphone system with at least two microphones in order to realize directional characteristics zeroth and first order. Preferably, however, more than two microphones are present, so that directional characteristics of second and higher order are possible.
  • the hearing aid device comprises a signal processing unit for processing and frequency-dependent amplification of the microphone signal generated by the microphone system.
  • the signal output is usually carried out by an acoustic output signal by means of a handset.
  • other types of output transducers are also known, e.g. Generate vibrations.
  • a microphone unit with a directional pattern of first order can be realized for example by a single gradient microphone or the electrical interconnection of two omnidirectional microphones.
  • DI directivity index
  • KEMAR a standard research dummy
  • Directional microphones of the second and higher order have DI values of 10 dB and more, which are advantageous for better speech intelligibility, for example. If a hearing aid device contains a microphone system with, for example, three omnidirectional microphones, microphone units with directional characteristics of zeroth to second order can be realized on this basis at the same time by suitable interconnection of the microphones.
  • a single omnidirectional microphone represents a zeroth-order microphone unit. If two microphone omnidirectional microphones, the microphone signal of a microphone delayed, inverted and added to the microphone signal of the other microphone, creating a first-order microphone unit. If, in turn, the microphone signal of a microphone unit is delayed, inverted and added to the microphone signal of the second microphone unit of the first order in the case of two microphone units of the first order, the result is a microphone unit with a directional characteristic of second order. In this way - depending on the number of omnidirectional microphones - microphone units of any order can be realized.
  • a microphone system comprises microphone units of different order, it is possible to switch between different directional characteristics, for example by switching on or off one or more microphones. Furthermore, by means of a suitable electrical connection of the microphone units, it is also possible to produce any desired mixed forms between the directional characteristics of different order. For this purpose, the microphone signals of the microphone units are weighted differently and added before they are further processed and amplified in the signal processing unit of the hearing aid. Thus, a continuous, smooth transition between different directional characteristics can be realized, which can avoid disturbing artifacts when switching.
  • an equalization of the signal levels of the microphone signals emanating from microphone units of different order advantageously takes place. This makes it possible to switch between the microphone signals or to quickly change the weighting of the individual microphone signals while simultaneously processing several microphone signals, without causing level jumps and associated artifacts.
  • a sudden change in the directional characteristic can e.g. caused by switching to another listening program. In this case, the program change can both be triggered manually as well as done due to an automatic situation detection by the hearing aid.
  • a rapid change in the directional characteristic takes place in particular when the hearing aid detects sudden noise.
  • the forward directional microphone is switched or the weight of the microphone signal emitted by the directional microphone relative to the weight of the omnidirectional microphone outgoing microphone signal increases.
  • the signal level of the microphone units of different order outgoing microphone signals normalized.
  • the reference signal used is, for example, the signal level of an omnidirectional microphone.
  • the signal level of a directional microphone and in particular the signal level of the directional microphone with the largest directivity is used as the reference signal.
  • the signal levels of the microphone signals emanating from the different microphone units are adjusted to the signal level of the reference signal.
  • the microphone signal to be processed is usually first divided into Frecruenzb.
  • the output signals of the individual microphones are divided into individual frequency bands.
  • the microphone signals in the individual frequency bands for the production of microphone units with directional characteristics of different order are interconnected.
  • Another embodiment of the invention provides that initially microphone units are provided which differ with respect to their directional characteristics, in order subsequently to subdivide the output signals of these microphone units into frequency bands.
  • the frequency-dependent, different weighting of the microphone signals of the microphone units of different order or the switching between different orders then advantageously takes place in these frequency bands, wherein preferably both the weights of the microphone signals of different microphone units in a frequency band and the weights of the emanating from a microphone microphone signals are independently adjustable in different frequency bands.
  • the normalization of the signal level then take place in the individual frequency bands.
  • the procedure is basically the same as in the previously described approximation of the signal level of the microphone signals emanating from different microphone units. The only difference is that the alignment does not take place over the entire bandwidth of the acoustic input signal, but is limited to only one frequency band.
  • the equalization then takes place in parallel in all frequency bands into which the input signal to be processed is divided.
  • the invention can be applied to all known hearing aid types with a directional microphone system, for example, in behind the ear portable hearing aids, in the ear portable hearing aids, implantable hearing aids or Taschenbuch confusetechnikn.
  • the hearing aid according to the invention may also be part of a plurality of devices for supplying a hearing aid comprising comprehensive hearing aid system, e.g. Part of a hearing aid system with two worn on the head hearing aids for binaural care or part of a hearing aid system, consisting of a portable on the head device and a wearable processor unit.
  • FIG. 1 shows the simplified block diagram of a hearing aid with two omnidirectional microphones 1 and 2.
  • the microphone signals generated by the microphones 1 and 2 are first signal pre-processing units 3 and 4, respectively. In these, for example, a pre-amplification and A / D conversion of the electrical output signals of the microphones take place.
  • a directional microphone unit 1, 2 having the directional characteristic of the first order arises from the microphones 1 and 2. from which the microphone signal R1 emerges.
  • the factor is calculated from the quotient of the signal level of the microphone signal R1 generated by the directional microphone 1, 2 in the counter and the signal level of the microphone signal R0 in the denominator produced by the omnidirectional microphone 1.
  • the microphone signal R1 of the microphone unit 1, 2 formed from the microphones 1 and 2 and the microphone signal R0 of the omnidirectional microphone 1 multiplied by the calculated factor are weighted and summed differently in the weighting unit 11.
  • the sum of the weights always yields 1.
  • the output signal of the weighting unit 11 is fed to a signal processing unit 12 for further processing and frequency-dependent amplification. Subsequently, the processed signal is converted back into an acoustic signal by a receiver 13 and delivered to an auditory canal of a hearing aid wearer.
  • the hearing aid shown has the advantage that in this by a shift of the weights in the weighting unit 11 and a hard switching can be changed quickly between different directional characteristics without this level jumps and associated audible distortions are caused by the change in the directional characteristic.
  • FIG. 2 Another embodiment of the invention shows FIG. 2 , Also in this a microphone system with two omnidirectional microphones 21 and 22 is present.
  • a signal preprocessing of the relevant microphone signal such as a preamplification and A / D conversion takes place, and in the circuit unit 25, the microphone signal generated by the microphone 22 is delayed and inverted and in the summer 26 to the microphone signal R0 'of the microphone 21 adds, resulting in the microphone signal R1' emerges.
  • both the microphone signal R0 'emanating from the omnidirectional microphone 21 and the microphone signal R1' generated by the directional microphone unit 21, 22 are available for further processing.
  • the microphone signals are now divided into frequency bands, which in order to improve the clarity in the embodiment, only a division into two frequency bands takes place, whereas in practice a division in eight and more frequency bands in hearing aids is common.
  • the microphone signal R0 'of the omnidirectional microphone 21 is fed to a filter bank 27 and the microphone signal R1' to the directional microphone unit 21, 22 to a filter bank 28.
  • From the filter bank 27 go the microphone signals R0A 'and R0B' and from the filter bank 28, the microphone signals R1A 'and R1B' out.
  • the outputs of the filter banks 27 and 28 are each connected to a level detector 29, 30, 31, 32.
  • the signal levels of the relevant microphone signals R0A ', R0B' or R1A ', R1B' are determined in the respective frequency band. Subsequently, the signal level of the microphone signal R0 'of the omnidirectional microphone 21 is adjusted to the signal level of the microphone signal R1' of the directional microphone unit 21, 22 in the respective frequency band.
  • the factor required for the respective frequency band results from the quotient of the signal level of the microphone signal R1A 'or R1B' of the directional microphone 21, 22 in the counter and the signal level of the microphone signal R0A 'or R0B' of the omnidirectional microphone 21 in FIG Denominator. Circuit units 33 and 34 are provided for determining the equalization factor.
  • the multiplication of the respective microphone signal R0A 'or R0B' with the calculated factor then takes place in the multiplier 35 or 36.
  • the (normalized) microphone signals adjusted for the respective frequency band are finally fed to signal processing units 37 and 38 in which the microphone signals are weighted differently and be summed or in which is switched between the different microphone signals.
  • a frequency-dependent further processing and amplification of the microphone signals to compensate for the individual hearing loss of a hearing aid wearer can take place in the signal processing units 37 and 38.
  • the separate frequency channels are recombined in the summer 39, the output signal of which is fed to a signal processing unit 40 in which, for example, a signal end amplification and D / A conversion takes place.
  • a conversion of the electrical output signal into an acoustic output signal takes place in a receiver 41.
  • the invention provides that outgoing microphone signals from microphone units with directional characteristics of different order outgoing microphone signals in their signal levels. The switching or cross-fading is then always between microphone signals with the same signal level, so that no level jumps occur due to the switching or cross-fading.

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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)

Claims (11)

  1. Procédé pour faire fonctionner une prothèse auditive ayant un système ( 1, 2 ; 21, 22 ) de microphone, une unité ( 12, 40 ) de traitement du signal et un transducteur ( 13, 41 ) de sortie, le système ( 1, 2 ; 21, 22 ) de microphone comprenant au moins deux unités ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone dont partent des signaux ( R0, R1 ; R0', R1' ) de microphone et qui ont des caractéristiques directionnelles d'ordre différent et dans lequel la caractéristique directionnelle du système ( 1, 2 ; 21, 22 ) de microphone peut être modifiée pendant le fonctionnement de la prothèse auditive, caractérisé en ce que des signaux de microphone partant d'unité de microphone ayant des caractéristiques directionnelles d'ordre différent peuvent être égalisées dans leur niveau de signal, au moins une unité ( 1 ; 21 ) de microphone égalisant le signal ( R0 ; R0' ) de microphone sortant de l'unité ( 1 ; 21 ) de microphone au niveau d'un signal de référence.
  2. Procédé suivant la revendication 1, caractérisé en ce que le niveau du signal de référence provient du niveau ( R1 ; R' ) de microphone de l'une des unités ( 1, 2 ; 21, 22 ) de microphone ou lui correspond.
  3. Procédé suivant la revendication 2, caractérisé en ce que le niveau du signal de référence provient du niveau de signal d'un microphone ( 1 ; 21 ) omnidirectionnel ou lui correspond.
  4. Procédé suivant la revendication 2, caractérisé en ce que le niveau du signal de référence provient du niveau de signal d'une unité ( 1, 2 ; 21, 22 ) de microphone directionnelle ou lui correspond.
  5. Procédé suivant la revendication 4, caractérisé en ce que le niveau du de référence provient du niveau de signal d'une unité ( 1, 2 ; 21, 22 ) de microphone directionnelle ayant l'ordre de caractéristique directionnelle le plus grand possible pouvant être atteint par le système ( 1, 2 ; 21, 22 ) de microphone ou lui correspond.
  6. Procédé suivant l'une des revendications 1 à 5, caractérisé en ce que les niveaux des signaux ( R0, R1 ; R0' , R1' ) de microphone des unités ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone sont égalisés respectivement au niveau du signal de référence et les signaux ( R0, R1 ; R0', R1') de microphone des unités ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone sont pondérés différemment et sommés.
  7. Procédé suivant la revendication 6, dans lequel la somme des pondérations est toujours égale à un.
  8. Procédé suivant l'une des revendications 1 à 7, caractérisé en ce que les niveaux des signaux ( R0, R1 ; R0', R1' ) de microphone partant des unités ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone d'ordre différent sont déterminés en utilisant comme signal de référence l'un des signaux ( R0, R1 ; R0', R1' ) de microphone et en utilisant des facteurs de manière à ce que les signaux ( R0 ; R0' ) de microphone des unités ( 1 ; 21 ) de microphone soient mises en coïncidence avec le niveau du signal de référence par multiplication par le facteur respectif dans son niveau de signal.
  9. Procédé suivant l'une des revendications 1 à 8, caractérisé en ce que les signaux ( R0, R1 ; R0', R1' ) de microphone partant des unités ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone sont répartis en plusieurs bandes de fréquence et pour au moins l'une des unités ( 1 ; 21 ) de microphone dans au moins une bande de fréquence le niveau du signal ( R0 ; R0' ) de microphone partant de l'unité ( 1 ; 21 ) de microphone est égalisé au niveau d'un signal de référence.
  10. Prothèse auditive pour effectuer le procédé suivant l'une des revendications 1 à 9, comprenant un système ( 1, 2 ; 21, 22 ) de microphone, une unité ( 12, 40 ) de traitement du signal et un transducteur ( 13, 41 ) de sortie, le système ( 1, 2 ; 21, 22 ) de microphone comprenant au moins deux unités ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone dont partent des signaux ( R0, R1 ; R0', R1' ) de microphone et qui ont des caractéristiques directionnelles d'ordre différent et dans lequel la caractéristique directionnelle du système ( 1, 2 ; 21, 21 ) de microphone peut être modifiée pendant le fonctionnement de la prothèse auditive caractérisé par des moyens d'égalisation du niveau du signal ( R0, R1 ; R0', R1' ) de microphone partant d'au moins une unité ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone à un niveau d'un signal de référence.
  11. Prothèse auditive suivant la revendication 10, caractérisé par des dispositifs ( 7, 8 ; 29, 30,31, 32 ) de mesure de niveau montés en aval des unités ( ( 1 ; 1, 2 ), ( 21 ; 21, 22 ) ) de microphone, ainsi que par au moins une unité ( 9 ; 33, 34 ) de circuit pour la détermination d'un facteur, ainsi qu'au moins un multiplicateur ( 10 ; 35, 36 ) pour la multiplication d'un signal ( R0 ; R0A', RB' ) de microphone par le facteur.
EP04013165A 2003-06-20 2004-06-03 Procédé de commande d'une prothèse auditive et prothèse auditive avec système de microphone dans lequel différentes caractéristiques directionnelles sont réglables Expired - Lifetime EP1489884B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10327890 2003-06-20
DE10327890A DE10327890A1 (de) 2003-06-20 2003-06-20 Verfahren zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteristiken einstellbar sind

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EP1489884A2 EP1489884A2 (fr) 2004-12-22
EP1489884A3 EP1489884A3 (fr) 2007-04-18
EP1489884B1 true EP1489884B1 (fr) 2012-12-12

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US (1) US7340073B2 (fr)
EP (1) EP1489884B1 (fr)
CN (1) CN1575042B (fr)
AU (1) AU2004202688B2 (fr)
DE (1) DE10327890A1 (fr)
DK (1) DK1489884T3 (fr)

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DE19948907A1 (de) 1999-10-11 2001-02-01 Siemens Audiologische Technik Verfahren zur Signalverarbeitung in einer Hörhilfe sowie Hörhilfe
JP2003527012A (ja) 2000-03-14 2003-09-09 オーディア テクノロジー インク 多重マイクロフォン方向システムにおける順応型マイクロフォン・マッチング
US7116792B1 (en) 2000-07-05 2006-10-03 Gn Resound North America Corporation Directional microphone system
EP2348751A1 (fr) * 2000-09-29 2011-07-27 Knowles Electronics, LLC Réseau de microphones de deuxième ordre
DE10114101A1 (de) 2001-03-22 2002-06-06 Siemens Audiologische Technik Verfahren zum Verarbeiten eines Eingangssignals in einer Signalverarbeitungseinheit eines Hörgerätes sowie Schaltung zur Durchführung des Verfahrens
GB2378626B (en) * 2001-04-28 2003-11-19 Hewlett Packard Co Automated compilation of music
ATE381237T1 (de) 2001-10-17 2007-12-15 Siemens Audiologische Technik Verfahren zum betrieb eines hörgerätes sowie hörgerät

Also Published As

Publication number Publication date
US7340073B2 (en) 2008-03-04
DK1489884T3 (da) 2013-03-18
CN1575042A (zh) 2005-02-02
AU2004202688A1 (en) 2005-01-13
US20050025325A1 (en) 2005-02-03
EP1489884A2 (fr) 2004-12-22
EP1489884A3 (fr) 2007-04-18
CN1575042B (zh) 2010-09-29
DE10327890A1 (de) 2005-01-20
AU2004202688B2 (en) 2007-04-05

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