EP1192838A2 - Hearing aid device, comprising a directional microphone system and a method for operating a hearing aid device - Google Patents
Hearing aid device, comprising a directional microphone system and a method for operating a hearing aid deviceInfo
- Publication number
- EP1192838A2 EP1192838A2 EP00927233A EP00927233A EP1192838A2 EP 1192838 A2 EP1192838 A2 EP 1192838A2 EP 00927233 A EP00927233 A EP 00927233A EP 00927233 A EP00927233 A EP 00927233A EP 1192838 A2 EP1192838 A2 EP 1192838A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- hearing aid
- microphone
- directional microphone
- order
- frequency
- 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
Links
Classifications
-
- 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
- H04R25/40—Arrangements for obtaining a desired directivity characteristic
- H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers
Definitions
- the invention relates to a hearing aid with the features of the preamble of claim 1. Furthermore, the invention relates to a method for operating a hearing aid.
- Hearing aid devices with at least two microphones for achieving directional microphone characteristics of first or higher order are known as prior art.
- second-order or higher-order directional microphone systems are used, an undesired reduction in the directivity index (directional index) occurs in individual frequency ranges of the input signal.
- the frequency range from 100 Hz to 6 kHz is particularly interesting for improving hearing.
- a directivity index that falls slightly towards higher frequencies is obtained over this frequency range.
- Di values of about 5 dB are obtained.
- Directional microphone systems of the n-th order with n> l have a negative directivity index due to the high sensitivity to component tolerances at low frequencies.
- DI values of 7 dB and more can be achieved for frequencies from 1 kHz to 5 kHz.
- a hearing aid is known from US Pat. No. 5,757,933 in which it is possible to switch manually between a zero-order microphone (microphone without directional effect) and a first-order microphone system. The switch is made by the hearing aid wearer.
- the invention has for its object to provide a hearing aid and a method for operating a hearing aid, in which a high directivity index is achieved over a wide frequency range of the input signal.
- the hearing aid according to the invention comprises at least two microphones in order to be able to implement directional microphone systems of zero, first or higher order.
- a zero-directional microphone system in the sense of the invention is to be understood as a microphone system without directional effect, for example an omnidirectional microphone that is not connected to other microphones.
- first-order directional microphone systems is a theoretically achievable maximum value of the directivity index
- DI DI of 6 dB (hypermere).
- KEMAR a standard research manikin
- Directional microphone systems of the second and higher order have Di values of 10 dB and more, which are advantageous, for example, for better speech intelligibility.
- a hearing aid contains, for example, three omnidirectional microphones
- directional microphone systems of zero to second order can be formed on this basis. Microphone signals can thus be simultaneously received from these directional microphone systems with zero to second order polar patterns.
- the microphone signals emanating from microphone systems of different orders are weighted and summed differently depending on the frequency.
- a hearing aid with directional microphone systems of first and second order essentially the first order microphone signal is further processed at low frequencies and the second order microphone signal is processed at higher frequencies.
- the weighting is preferably carried out by filter elements, the microphone signal of the first-order directional microphone system being subjected to low-pass filtering and the microphone signal of the second-order directional microphone system being subjected to high-pass filtering.
- the microphone signal of the directional microphone of the first order is passed on at low frequencies and the microphone signal of the directional microphone system of the nth order is passed on for further processing, where n stands for the highest occurring order.
- essentially the microphone signals of the directional microphone systems between the first and the highest occurring order are preferably processed further.
- the cut-off frequencies of the filter elements connected downstream of the directional microphone systems are adjustable.
- the limit frequencies in the audible frequency range for example up to 10 kHz
- the associated frequency-dependent selection of directional microphone systems of different orders directional properties can be achieved for the overall system, which are clearly superior to conventional hearing aids, viewed over the entire frequency range.
- An optimized directional effect can thus be achieved for each frequency of the input signal.
- Modern hearing aids allow the acoustic input signal to be divided into channels. Among other things, this enables different amplification of individual frequency ranges.
- the cutoff frequencies of the filter elements downstream of the directional microphone systems are coupled to cutoff cutoff frequencies of the hearing aid.
- each directional microphone system forms a channel.
- the filter elements for weighting the microphone signals then simultaneously effect the channel division, which means that additional filter elements for channel division can be omitted.
- the position of one or more cut-off frequencies can also be determined according to the situation and continuously checked and adjusted. This results in an optimized adaptation to different usable / noise situations.
- the environmental situation is preferably analyzed by means of a neural network and / or a fuzzy logic controller.
- the setting of the cut-off frequencies and the overall directional characteristic of the microphone system of a hearing aid according to the invention can also be carried out differently depending on the hearing program set.
- a zero-order microphone signal microphone signal with no directional effect
- FIG. 1 shows a basic circuit diagram for the generation and frequency-dependent combination of directional microphone systems of different orders
- Figure 2 is a schematic diagram of a hearing aid with three microphones
- Figure 3 shows a frequency-specific curve of the directivity index (DI).
- the microphones of a hearing aid are labeled MIK1, MIK2, ...., MIKm.
- the electronic circuit arrangement ES for forming directional microphone systems can include electronic components such as delay elements, summation elements or inverters.
- the directional microphone signals thus formed at the output of the electronic circuit ES are referred to as zero-order directional microphone signal RSO, first-order directional microphone signal RS1,..., N-order directional microphone signal RSn.
- Several directional microphone signals of the same order can also be formed. In the hearing aid according to the invention, however, at least two directional microphone signals differ in terms of their order.
- the filter bank FB has filter elements, for example high-pass, low-pass or bandpass filters.
- the directional microphone signals are attenuated differently by the filter bank FB depending on their order and their signal frequency.
- the cut-off frequencies and filter coefficients of the individual filter elements can preferably be set.
- the output signals (AS0, AS1 ... ASn) of the filter bank FB are fed to a summation element S in order to form the overall microphone microphone signal GRS.
- the principle circuit diagram shown for processing the microphone signals of a hearing aid can be implemented both in digital and in analog circuitry. There can also be other elements Components such as A / D converters, D / A converters, switches, amplifiers, etc. (not shown here).
- the circuit will be set in such a way that the first-order directional microphone signal is transmitted at least essentially up to a lower limit frequency fgl, for example 1 kHz.
- fgl a lower limit frequency
- the directional microphone signal of the first order is increasingly mixed with directional microphone signals of a higher order and possibly the directional microphone signals are even attenuated.
- FIG. 2 shows an exemplary embodiment of a hearing aid with three microphones 1, 2 and 3.
- a signal line 11 there is a signal of a first order system with the directional microphone characteristic “undelayed eight” when the input signals of the microphones 1, 2 follow Inversion in the inverter 4 can be added via the sum element 7.
- a signal with the directional microphone characteristic "delayed eight" of a first-order directional microphone system is present in the signal line 13 when the signals of the microphones 2 and 3 are added in the sum element 8 after inverting the signal of the microphone 3 in the inverter 5 and subsequently inverted in the inverter 6 and delayed in the delay element 10.
- the microphone pairs 1, 2 and 2, 3 thus each form a first-order directional microphone system due to the circuitry shown.
- the mentioned signals of the directional microphone systems of the first order are processed in a signal processing unit 14 (channel-specific zifisch) processed and supplied as an output signal to the speaker 16.
- the circuit diagram according to FIG. 2 also allows a. To be implemented by suitably interconnecting all three microphones
- Directional microphone system of the second order in that the signals of the signal lines 11, 13 are combined in the sum element 9 to form the signal line 12.
- the signal processing unit 14 comprises a filter element
- the signal processing unit 14 can essentially further process the signals in the signal lines 11 or 13. If the signal frequency exceeds the limit frequency fg, the filter element 17 essentially further processes the signal of the signal line 12, and thus a signal of a second-order directional microphone system.
- the signal lines 11 and 13 in the filter element 17 are connected to low-pass filters, while the signal line 12 is fed to a high-pass filter.
- the filtered signals are summed (not shown).
- DI directivity index
- neural networks and fuzzy logic controls can be present to control the respective Limit frequencies fg to be determined again and again in accordance with the situation by signal-analytical assessment of the useful / storage noise and, if necessary, continuously adapted.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19925392 | 1999-06-02 | ||
DE19925392 | 1999-06-02 | ||
PCT/EP2000/004648 WO2000076268A2 (en) | 1999-06-02 | 2000-05-22 | Hearing aid device, comprising a directional microphone system and a method for operating a hearing aid device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1192838A2 true EP1192838A2 (en) | 2002-04-03 |
EP1192838B1 EP1192838B1 (en) | 2003-08-06 |
EP1192838B2 EP1192838B2 (en) | 2013-09-04 |
Family
ID=7910100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00927233.7A Expired - Lifetime EP1192838B2 (en) | 1999-06-02 | 2000-05-22 | Hearing aid device, comprising a directional microphone system and a method for operating a hearing aid device |
Country Status (5)
Country | Link |
---|---|
US (2) | US7324649B1 (en) |
EP (1) | EP1192838B2 (en) |
DE (1) | DE50003206D1 (en) |
DK (1) | DK1192838T4 (en) |
WO (1) | WO2000076268A2 (en) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7050876B1 (en) | 2000-10-06 | 2006-05-23 | Phonak Ltd. | Manufacturing methods and systems for rapid production of hearing-aid shells |
DE10310579B4 (en) * | 2003-03-11 | 2005-06-16 | Siemens Audiologische Technik Gmbh | Automatic microphone adjustment for a directional microphone system with at least three microphones |
DE10327889B3 (en) | 2003-06-20 | 2004-09-16 | Siemens Audiologische Technik Gmbh | Adjusting hearing aid with microphone system with variable directional characteristic involves adjusting directional characteristic depending on acoustic input signal frequency and hearing threshold |
EP1489882A3 (en) * | 2003-06-20 | 2009-07-29 | Siemens Audiologische Technik GmbH | Method for operating a hearing aid system as well as a hearing aid system with a microphone system in which different directional characteristics are selectable. |
DE10327890A1 (en) * | 2003-06-20 | 2005-01-20 | Siemens Audiologische Technik Gmbh | Method for operating a hearing aid and hearing aid with a microphone system, in which different directional characteristics are adjustable |
ES2281816T3 (en) * | 2003-07-07 | 2007-10-01 | Koninklijke Philips Electronics N.V. | SYSTEM AND METHOD FOR AUDIO SIGNAL PROCESSING. |
DE10331956C5 (en) * | 2003-07-16 | 2010-11-18 | Siemens Audiologische Technik Gmbh | Hearing aid and method for operating a hearing aid with a microphone system, in which different Richtcharaktistiken are adjustable |
DE10334396B3 (en) * | 2003-07-28 | 2004-10-21 | Siemens Audiologische Technik Gmbh | Electrical hearing aid has individual microphones combined to provide 2 microphone units in turn combined to provide further microphone unit with same order directional characteristic |
CN1839661B (en) * | 2003-09-19 | 2012-11-14 | 唯听助听器公司 | A method for controlling the directionality of the sound receiving characteristic of a hearing aid and a signal processing apparatus for a hearing aid with a controllable directional characteristic |
EP1695590B1 (en) * | 2003-12-01 | 2014-02-26 | Wolfson Dynamic Hearing Pty Ltd. | Method and apparatus for producing adaptive directional signals |
ATE511321T1 (en) * | 2005-03-01 | 2011-06-15 | Oticon As | SYSTEM AND METHOD FOR DETERMINING THE DIRECTIONALITY OF SOUND USING A HEARING AID |
US7697827B2 (en) | 2005-10-17 | 2010-04-13 | Konicek Jeffrey C | User-friendlier interfaces for a camera |
US7936890B2 (en) | 2006-03-28 | 2011-05-03 | Oticon A/S | System and method for generating auditory spatial cues |
EP1841281B1 (en) * | 2006-03-28 | 2015-07-29 | Oticon A/S | System and method for generating auditory spatial cues |
US8189837B2 (en) | 2006-12-15 | 2012-05-29 | Phonak Ag | Hearing system with enhanced noise cancelling and method for operating a hearing system |
JP4367484B2 (en) | 2006-12-25 | 2009-11-18 | ソニー株式会社 | Audio signal processing apparatus, audio signal processing method, and imaging apparatus |
US8107654B2 (en) | 2008-05-21 | 2012-01-31 | Starkey Laboratories, Inc | Mixing of in-the-ear microphone and outside-the-ear microphone signals to enhance spatial perception |
DE102008049086B4 (en) * | 2008-09-26 | 2011-12-15 | Siemens Medical Instruments Pte. Ltd. | Hearing aid with a directional microphone system and method for operating such a hearing aid |
EP2262285B1 (en) * | 2009-06-02 | 2016-11-30 | Oticon A/S | A listening device providing enhanced localization cues, its use and a method |
JP5304571B2 (en) * | 2009-09-24 | 2013-10-02 | 沖電気工業株式会社 | Sound collector, acoustic communication system, and program |
US9055357B2 (en) | 2012-01-05 | 2015-06-09 | Starkey Laboratories, Inc. | Multi-directional and omnidirectional hybrid microphone for hearing assistance devices |
WO2015179914A1 (en) | 2014-05-29 | 2015-12-03 | Wolfson Dynamic Hearing Pty Ltd | Microphone mixing for wind noise reduction |
US9763016B2 (en) | 2014-07-31 | 2017-09-12 | Starkey Laboratories, Inc. | Automatic directional switching algorithm for hearing aids |
US10492008B2 (en) | 2016-04-06 | 2019-11-26 | Starkey Laboratories, Inc. | Hearing device with neural network-based microphone signal processing |
US10679640B2 (en) * | 2018-08-16 | 2020-06-09 | Harman International Industries, Incorporated | Cardioid microphone adaptive filter |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
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US4399327A (en) | 1980-01-25 | 1983-08-16 | Victor Company Of Japan, Limited | Variable directional microphone system |
US4751738A (en) | 1984-11-29 | 1988-06-14 | The Board Of Trustees Of The Leland Stanford Junior University | Directional hearing aid |
US4742548A (en) | 1984-12-20 | 1988-05-03 | American Telephone And Telegraph Company | Unidirectional second order gradient microphone |
JPS6223300A (en) | 1985-07-23 | 1987-01-31 | Victor Co Of Japan Ltd | Directional microphone equipment |
DE8529458U1 (en) * | 1985-10-16 | 1987-05-07 | Siemens AG, 1000 Berlin und 8000 München | Hearing aid |
US5121426A (en) | 1989-12-22 | 1992-06-09 | At&T Bell Laboratories | Loudspeaking telephone station including directional microphone |
DE69221762T2 (en) | 1991-04-18 | 1998-03-05 | Matsushita Electric Ind Co Ltd | Microphone apparatus |
US5524056A (en) | 1993-04-13 | 1996-06-04 | Etymotic Research, Inc. | Hearing aid having plural microphones and a microphone switching system |
EP0632586A1 (en) * | 1993-06-29 | 1995-01-04 | Laboratoires D'electronique Philips S.A.S. | Device for automatic control of sounds with fuzzy logic |
US5463694A (en) | 1993-11-01 | 1995-10-31 | Motorola | Gradient directional microphone system and method therefor |
US5473701A (en) * | 1993-11-05 | 1995-12-05 | At&T Corp. | Adaptive microphone array |
EP0712261A1 (en) | 1994-11-10 | 1996-05-15 | Siemens Audiologische Technik GmbH | Programmable hearing aid |
US5793875A (en) * | 1996-04-22 | 1998-08-11 | Cardinal Sound Labs, Inc. | Directional hearing system |
US5715319A (en) * | 1996-05-30 | 1998-02-03 | Picturetel Corporation | Method and apparatus for steerable and endfire superdirective microphone arrays with reduced analog-to-digital converter and computational requirements |
US5757933A (en) | 1996-12-11 | 1998-05-26 | Micro Ear Technology, Inc. | In-the-ear hearing aid with directional microphone system |
US6041127A (en) * | 1997-04-03 | 2000-03-21 | Lucent Technologies Inc. | Steerable and variable first-order differential microphone array |
US6236731B1 (en) * | 1997-04-16 | 2001-05-22 | Dspfactory Ltd. | Filterbank structure and method for filtering and separating an information signal into different bands, particularly for audio signal in hearing aids |
US6240192B1 (en) * | 1997-04-16 | 2001-05-29 | Dspfactory Ltd. | Apparatus for and method of filtering in an digital hearing aid, including an application specific integrated circuit and a programmable digital signal processor |
US6154552A (en) * | 1997-05-15 | 2000-11-28 | Planning Systems Inc. | Hybrid adaptive beamformer |
US6766029B1 (en) * | 1997-07-16 | 2004-07-20 | Phonak Ag | Method for electronically selecting the dependency of an output signal from the spatial angle of acoustic signal impingement and hearing aid apparatus |
US6603861B1 (en) * | 1997-08-20 | 2003-08-05 | Phonak Ag | Method for electronically beam forming acoustical signals and acoustical sensor apparatus |
EP0820210A3 (en) * | 1997-08-20 | 1998-04-01 | Phonak Ag | A method for elctronically beam forming acoustical signals and acoustical sensorapparatus |
NL1007858C2 (en) | 1997-12-19 | 1999-06-22 | Microtronic Nederland Bv | Directional hearing aid. |
JP4163294B2 (en) * | 1998-07-31 | 2008-10-08 | 株式会社東芝 | Noise suppression processing apparatus and noise suppression processing method |
-
2000
- 2000-05-22 EP EP00927233.7A patent/EP1192838B2/en not_active Expired - Lifetime
- 2000-05-22 DK DK00927233.7T patent/DK1192838T4/en active
- 2000-05-22 WO PCT/EP2000/004648 patent/WO2000076268A2/en active IP Right Grant
- 2000-05-22 US US09/979,966 patent/US7324649B1/en not_active Expired - Fee Related
- 2000-05-22 DE DE50003206T patent/DE50003206D1/en not_active Expired - Lifetime
-
2007
- 2007-10-22 US US11/876,142 patent/US7929721B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0076268A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP1192838B1 (en) | 2003-08-06 |
DE50003206D1 (en) | 2003-09-11 |
DK1192838T4 (en) | 2013-12-16 |
EP1192838B2 (en) | 2013-09-04 |
US7324649B1 (en) | 2008-01-29 |
WO2000076268A3 (en) | 2001-05-17 |
DK1192838T3 (en) | 2003-10-27 |
WO2000076268A2 (en) | 2000-12-14 |
US7929721B2 (en) | 2011-04-19 |
US20080044046A1 (en) | 2008-02-21 |
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