EP1489884A2 - 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
EP1489884A2
EP1489884A2 EP04013165A EP04013165A EP1489884A2 EP 1489884 A2 EP1489884 A2 EP 1489884A2 EP 04013165 A EP04013165 A EP 04013165A EP 04013165 A EP04013165 A EP 04013165A EP 1489884 A2 EP1489884 A2 EP 1489884A2
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EP
European Patent Office
Prior art keywords
microphone
signal
signal level
directional
signals
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
EP04013165A
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German (de)
English (en)
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EP1489884A3 (fr
EP1489884B1 (fr
Inventor
Eghart Fischer
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Sivantos GmbH
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Siemens Audioligische Technik GmbH
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Publication date
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Publication of EP1489884A2 publication Critical patent/EP1489884A2/fr
Publication of EP1489884A3 publication Critical patent/EP1489884A3/fr
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Publication of EP1489884B1 publication Critical patent/EP1489884B1/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
    • H04R25/43—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 converter, the microphone system comprises at least two microphone units, of which Microphone signals go out and the directional characteristics different Have order, and being the directional characteristic the microphone system during operation of the hearing aid is changeable.
  • the invention further relates to a Hearing aid for performing the method.
  • Classification devices are found in modern hearing aids of listening situations use. Depending on the listening situation the transmission parameters of the hearing aid are automatic varied.
  • the classification can include influence have on the operation of noise suppression algorithms as well as the microphone system. For example selected depending on the recognized hearing situation (switched discretely or continuously blended) between one omnidirectional polar pattern (polar pattern zero order) and a clear directivity of the microphone system (Polar pattern of first or higher order).
  • Gradient microphones are used to generate the directional characteristic used or multiple omnidirectional microphones electrically interconnected.
  • Such microphone systems show a frequency-dependent transmission behavior in which a there is a clear drop to low frequencies.
  • the noise behavior of the microphones is frequency-independent and slightly compared to an omnidirectional microphone strengthened. To achieve a natural sound impression the high-pass frequency response of the microphone system can be compensated for by amplifying the low frequencies.
  • the noise present in the low frequency range is thereby also reinforced and, under certain circumstances, clear and disturbing audible, while soft noises are masked by the noise.
  • a hearing aid with a Signal processing unit and at least two microphones the different to form directional microphone systems Order can be interconnected, the directional microphone systems in turn in the frequency of that of the Microphones emitted microphone signals depending on the weighting are interconnectable. Depending on the result the cutoff frequency between adjacent Frequency bands where a different Weighting of the microphone signals is provided become.
  • a hearing aid with directional microphone system is known from EP 0 942 627 A2 with a signal processing device, a handset and several microphones known, the output signals for Generation of an individual directional microphone characteristic via Delay devices and the signal processing device Can be interconnected in different weightings are.
  • the preferred one Reception direction (main direction) in adaptation to one present hearing situation can be adjusted individually.
  • the directional microphone signal Microphones will be in the range of low signal frequencies Amplitude amplified and the microphone signal of the omnidirectional Microphones adjusted. To generate one if possible linear frequency response is in the directional microphone signal path Microphones provided an equalizer, the microphone signal in the lower frequency range. Both that Microphone signal of the omnidirectional microphone as well The directional microphone microphone signal is finally a switching unit fed. In a first switch position the switchover unit is the omnidirectional microphone and in a second switch position of the switchover unit Directional microphone connected to a hearing aid amplifier. The switching unit can depend on the signal level automatically switch a microphone signal.
  • a disadvantage of the known hearing aids with a directional microphone system is that when switching between different Directional characteristics of the microphone system or with a quick transition from a directional characteristic to a different level jump and thus artifacts become.
  • the object of the present invention is in a hearing aid Artifacts from rapid changes in the directional characteristic to avoid the microphone system.
  • the microphone system comprises at least two microphone units, of which Microphone signals go out and the directional characteristics different Have order, and being the directional characteristic the microphone system during operation of the hearing aid is changeable, solved in that at least a microphone unit the signal level of the microphone unit outgoing microphone signal the signal level of a Reference signal is adjusted.
  • the task is also carried out with a hearing aid of the method with a microphone system, a signal processing unit and an output converter, the Microphone system comprises at least two microphone units, from which emit microphone signals and the directional characteristics have different order, and being the directional characteristic the microphone system during the operation of the Hearing aid is changeable, solved by means of adjustment the signal level of at least one from a microphone unit outgoing 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 for directional characteristics zero and first order. Preferably however, there are more than two microphones, so that directional characteristics of second and higher order possible are.
  • the hearing aid device further comprises a signal processing unit for processing and frequency dependent Amplification of the microphone signal generated by the microphone system.
  • the signal is usually output by an acoustic signal Output signal using a handset. But there are also known other types of output converters, e.g. vibrations produce.
  • a microphone unit with a directional characteristic first order can for example through a single gradient microphone or the electrical Connection of two omnidirectional microphones implemented become.
  • first order directional microphones is a theoretical one achievable maximum value of the directive index (DI) of 6 dB (hypercardioid).
  • DI directive index
  • Directional microphones second and higher order have DI values of 10 dB and more, for example for better speech intelligibility are advantageous.
  • a hearing aid contains a microphone system with three omnidirectional microphones, for example can be based on this by suitable connection of the microphones at the same time microphone units with directional characteristics zero to second order can be realized.
  • a single omnidirectional microphone provides one Microphone unit represents zero order. Is with two omnidirectional Microphones delay the microphone signal of a microphone, inverted and to the microphone signal of the other microphone added, this creates a first-order microphone unit. Again, with two first order microphone units the microphone signal of a microphone unit is delayed, inverted and the microphone signal of the second microphone unit added first order, this results in a microphone unit with second order polar pattern. Leave this way itself - depending on the number of omnidirectional microphones - Realize microphone units of any order.
  • a microphone system comprises different microphone units Order, so there can be between different directional characteristics can be switched, e.g. by switching on or off one or more microphones. Furthermore, a suitable electrical connection of the microphone units also any mixed forms between the directional characteristics different order are generated. For this, the Microphone signals of the microphone units weighted differently and added before being in the signal processing unit of the hearing aid are processed and amplified. So a continuous, smooth transition between different directional characteristics can be realized, thereby avoiding annoying artifacts when switching to let.
  • the hearing aid according to the invention advantageously takes place an approximation of the signal levels of that of microphone units microphone signals originating in different orders. Thereby it becomes possible to switch between the microphone signals or when processing several Microphone signals the weighting of the individual microphone signals to change quickly without making level jumps and thus associated artifacts.
  • a sudden one Changing the directional characteristic can e.g. by switching caused by another hearing program. It can the program change can both be triggered manually as well due to an automatic situation detection by the Hearing aid done.
  • a quick change in the directional characteristic takes place especially when the hearing aid recognizes suddenly occurring noise.
  • the reference signal is e.g. the signal level an omnidirectional microphone.
  • the Signal level from the different microphone units outgoing microphone signals become the signal level of the reference signal equalized.
  • the microphone signal to be processed is used usually first divided into frequency bands.
  • the output signals of each Microphones divided into individual frequency bands.
  • the microphone signals in the individual frequency bands for the generation of microphone units with directional characteristics different order interconnected.
  • Another Embodiment of the invention provides that initially Microphone units are provided that are related differentiate their directional characteristics to subsequently the output signals of these microphone units in frequency bands to divide.
  • both the weights the microphone signals of different microphone units in a frequency band as well as the weights of a microphone unit outgoing microphone signals in different Frequency bands can be set independently of one another.
  • at a hearing aid according to the invention can standardize the signal level then also in the individual frequency bands respectively.
  • the procedure is basically the same as in the previously described adjustment of the signal levels that originating from different microphone units Microphone signals. The only difference is that that alignment doesn't span the full range of the acoustic input signal takes place, but only on a frequency band is restricted.
  • the adjustment is preferably carried out then parallel in all frequency bands in which the input signal to be processed is divided.
  • the invention can be used with all known hearing aid types be used with a directional microphone system, for example hearing aids worn behind the ear, in which Ear portable hearing aids, implantable hearing aids or pocket hearing aids.
  • the hearing aid according to the invention also part of a plurality of devices for Care of a hearing aid system that is comprehensive for the hearing impaired be, e.g. Part of a hearing aid system with two worn on the head Hearing aids for binaural care or part a hearing aid system consisting of a wearable on the head Device and a processor unit that can be worn on the body.
  • Figure 1 shows the simplified block diagram of a hearing aid with two omnidirectional microphones 1 and 2.
  • Die Microphone signals generated by microphones 1 and 2 are initially Signal preprocessing units 3 and 4 supplied. In this can be, for example, a preamplification and A / D conversion the electrical output signals of the microphones.
  • Signal preprocessing units 3 and 4 supplied. In this can be, for example, a preamplification and A / D conversion the electrical output signals of the microphones.
  • By delaying and inverting that of the omnidirectional Microphone 2 generated microphone signal in the Circuit unit 5 and subsequent summation with that of microphone signal R0 outgoing to microphone 1 in the summer 6 emerges from the microphones 1 and 2 a directional microphone unit 1,2 with directional characteristic of first order, off which produces the microphone signal R1.
  • a multiplier calculates the signal level of the microphone signal emanating from the omnidirectional microphone 1 R0 the signal level from the microphones 1 and 2 formed directional microphone unit 1, 2 aligns.
  • the Multiplication of the microphone signal emanating from the microphone 1 R0 with the calculated factor takes place in a multiplier 10.
  • the factor is calculated from the quotient of the signal level of the directional microphone 1, 2 generate Microphone signal R1 in the counter and the signal level of the by the omnidirectional microphone 1 generate microphone signal R0 in Denominator.
  • the microphone signal R1 the microphone unit 1, 2 formed from the microphones 1 and 2 and the microphone signal multiplied by the calculated factor R0 of the omnidirectional microphone 1 in the weighting unit 11 differently weighted and summed.
  • the sum of the weights always results in 1.
  • the hearing aid shown has the advantage that with this by shifting the weights in the weighting unit 11 or a hard switch quickly between different Directional characteristics can be changed, without any level jumps and associated audible Distortion caused by changing the directional characteristic are caused.
  • FIG. 2 Another exemplary embodiment of the invention is shown in FIG. 2. Also with this is a microphone system with two omnidirectional Microphones 21 and 22 available.
  • each one Signal preprocessing of the microphone signal in question e.g. a pre-amplification and A / D conversion
  • the circuit unit 25 becomes the microphone signal generated by the microphone 22 delayed and inverted and in the summer 26 to that Microphone signal R0 'of the microphone 21 added, resulting in the microphone signal R1 'emerges.
  • the omnidirectional microphone 21 Microphone signal R0 'as well as that of the directional Microphone unit 21, 22 generated microphone signal R1 'available.
  • the microphone signals are now divided into frequency bands, being to improve clarity in the embodiment only one division into two frequency bands takes place, whereas in practice a division common in eight and more frequency bands for hearing aids is.
  • the microphone signal R0 ' is omnidirectional Microphones 21 of a filter bank 27 and the microphone signal R1 'of the directional microphone unit 21, 22 one Filter bank 28 supplied.
  • the microphone signals go out of the filter bank 27 R0A 'and R0B' and from the filter bank 28 the Microphone signals R1A 'and R1B'.
  • the outputs of the filter banks 27 and 28 are each with a level detector 29, 30, 31, 32 connected.
  • the signal levels of the relevant microphone signals R0A ', R0B 'or R1A', R1B 'determined in the respective frequency band are adjusted in the respective frequency band.
  • the respective frequency band results for the respective frequency band to approximate required factor 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 the denominator. Circuit units are used to determine the approximation factor 33 and 34 available.
  • Frequency band adjusted (standardized) microphone signals are signal processing units 37 and 38, respectively supplied, in which the microphone signals weighted differently and be summed or in which between the different Microphone signals is switched.
  • Advantageous can also in the signal processing units 37 and 38 frequency-dependent processing and amplification of the microphone signals to compensate for the individual's hearing loss Hearing aid wearer.
  • the output signal of a signal processing unit 40 is supplied, in which, for example, a signal amplification and D / A conversion takes place.
  • the electrical output signal is converted into an acoustic output signal in a handset 41st
  • a hearing aid with a microphone system should Switch between different directional characteristics resulting artifacts can be avoided.
  • the invention provides for this before that of microphone units with directional characteristics microphone signals in different order be adjusted to their signal levels. Switching or Crossfading then always takes place between microphone signals same signal level, so that by switching or crossfading there are no level jumps.

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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)
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

Publications (3)

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

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EP04013165A Expired - Lifetime EP1489884B1 (fr) 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

Country Status (6)

Country Link
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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WO2007057837A1 (fr) * 2005-11-18 2007-05-24 Koninklijke Philips Electronics N.V. Systeme de traitement des signaux, par exemple systeme de traitement des signaux sonores, ou dispositif d'aide auditive

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EP2897386B2 (fr) 2006-03-03 2021-08-04 GN Hearing A/S Commutation automatique entre des modes de microphone omnidirectionnels et directionnels dans une prothèse auditive
DE102008017552B3 (de) 2008-04-07 2009-10-15 Siemens Medical Instruments Pte. Ltd. Verfahren zum Umschalten eines Hörgeräts zwischen zwei Betriebszuständen und Hörgerät
DE102008022533B3 (de) * 2008-05-07 2009-10-08 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betrieb eines Hörgeräts und Mikrofonsystem für ein Hörgerät
DE102008046040B4 (de) * 2008-09-05 2012-03-15 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betrieb einer Hörvorrichtung mit Richtwirkung und zugehörige Hörvorrichtung
WO2010089821A1 (fr) * 2009-02-06 2010-08-12 パナソニック株式会社 Prothèse auditive
DE102009014053B4 (de) * 2009-03-19 2012-11-22 Siemens Medical Instruments Pte. Ltd. Verfahren zum Einstellen einer Richtcharakteristik und Hörvorrichtungen
EP2629551B1 (fr) * 2009-12-29 2014-11-19 GN Resound A/S Aide auditive binaurale
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CN102142256B (zh) * 2010-08-06 2012-08-01 华为技术有限公司 淡入时间的计算方法和装置
DE102013201043B4 (de) * 2012-08-17 2016-03-17 Sivantos Pte. Ltd. Verfahren und Vorrichtung zum Bestimmen eines Verstärkungsfaktors eines Hörhilfegeräts
DE102013207149A1 (de) * 2013-04-19 2014-11-06 Siemens Medical Instruments Pte. Ltd. Steuerung der Effektstärke eines binauralen direktionalen Mikrofons
DE102017221006A1 (de) * 2017-11-23 2019-05-23 Sivantos Pte. Ltd. Verfahren zum Betrieb eines Hörgerätes
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EP0942627A2 (fr) * 1998-03-09 1999-09-15 Siemens Audiologische Technik GmbH Prothèse auditive avec système de microphone directionnel et procédé de fonctionnement
DE19849739A1 (de) * 1998-10-28 2000-05-31 Siemens Audiologische Technik Adaptives Verfahren zur Korrektur der Mikrofone eines Richtmikrofonsystems in einem Hörgerät sowie Hörgerät
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Also Published As

Publication number Publication date
CN1575042A (zh) 2005-02-02
EP1489884A3 (fr) 2007-04-18
AU2004202688B2 (en) 2007-04-05
US7340073B2 (en) 2008-03-04
CN1575042B (zh) 2010-09-29
DE10327890A1 (de) 2005-01-20
DK1489884T3 (da) 2013-03-18
US20050025325A1 (en) 2005-02-03
AU2004202688A1 (en) 2005-01-13
EP1489884B1 (fr) 2012-12-12

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