EP1571880A2 - Hörgerät mit mehreren Mikrofonen und entsprechendes Signalerzeugungsverfahren - Google Patents
Hörgerät mit mehreren Mikrofonen und entsprechendes Signalerzeugungsverfahren Download PDFInfo
- Publication number
- EP1571880A2 EP1571880A2 EP05101230A EP05101230A EP1571880A2 EP 1571880 A2 EP1571880 A2 EP 1571880A2 EP 05101230 A EP05101230 A EP 05101230A EP 05101230 A EP05101230 A EP 05101230A EP 1571880 A2 EP1571880 A2 EP 1571880A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- microphone
- hearing aid
- microphones
- signal
- aid according
- 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
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Electric hearing aids
- H04R25/40—Arrangements for obtaining a desired directivity characteristic
- H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Electric hearing aids
- 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
- H04R2410/01—Noise reduction using microphones having different directional characteristics
Definitions
- the present invention relates to a hearing aid with a first microphone for providing a first microphone signal, a second microphone for providing a second one Microphone signal and a signal processing device for Generating a hearing aid output signal from the first and the second microphone signal.
- the concerns present invention a corresponding method for Generating a hearing aid output signal.
- the inherent noise of the microphones in hearing aids limits the Dynamic range, especially when differential Directional microphone algorithms are used. These have to Result that at low frequencies the noise of the microphones is raised significantly.
- the directivity for low frequencies is limited, as is known, for example, from "Threemicrophone instrument is designed to extend benefits of directionality", The Hearing Journal, October 2002, Vol. 55, No. 10, pages 38-45 only a directional microphone of the first order and for high frequencies a directional microphone of the second order calculated.
- the attenuation of the interference signals which do not occur from the preferred direction, is lower for low frequencies.
- the directivity is completely removed at low input levels, so that the noise caused by a directional microphone is eliminated.
- the microphone characteristic in this case corresponds to an omnidirectional microphone.
- the object of the present invention is therefore to a directional effect in the low-frequency range to ensure reduced noise and a corresponding Hearing aid or a corresponding method for generating a To provide hearing aid output signal.
- a hearing aid with a first microphone means for providing a first Microphone signal, a second microphone device for Supplying a second microphone signal and a Signal processing device for generating a Hearing aid output signal from the first and the second Microphone signal, the first microphone device a Electret microphone and the second microphone device Includes silicon microphone.
- the favorable noise behavior of the silicon microphones at low frequencies allows a better directivity (larger directivity index) with the same noise. In other words, there is less noise with the same directivity.
- the signal quality at higher frequencies will not influenced because in this area the conventional electret microphone is used for signal recording.
- first microphone device directly a high-pass filter downstream.
- the microphone noise of the Electret microphone suppressed at low frequencies.
- the signal processing device may be an adder include, with the optionally filtered Microphone signals are added. That way you can the two microphone signals in a relatively simple manner combine.
- the Signal processing device for the first and the second Microphone signal in each case an analog / digital converter have, so that the two microphone signals digital can be combined with each other. This allows the Benefits of digital signal processing are used.
- the first microphone device at least two electret microphones.
- directional microphones of first order with two Electret microphones, directional microphones of the second order with three Electret microphones, etc. for the high-frequency range realize.
- the second microphone device include at least two silicon microphones. Leave it Directional microphones of the first order, second order, etc. for realize the low frequency range.
- the input components of a hearing aid according to the invention are outlined simplified.
- the hearing aid has a silicon microphone SM and an electret microphone EM.
- the output signal of the silicon microphone SM is fed to a low-pass filter TP.
- the output signal of the electret microphone EM is in turn directed into a high-pass filter HP.
- the cut-off frequency f G of both filters TP and HP is chosen to be approximately the same, so that, in a first approximation, a flat transmission function results for both filters together in the sum.
- the two output signals of the filters TP and HP are added in an adder A.
- the sum signal of the adder A is supplied to the further hearing aid signal processing SV.
- the illustrated combination of the two types of microphone allows that the low frequencies of the silicon microphone SM and the high frequencies recorded by the electret microphone be the broadband hearing aid input signal for the Signal processing SV to produce.
- the combination can take place analogously in the form of a crossover, or else be realized digitally.
- For the digital Signal processing are analog to digital converter additionally required.
- a directional microphone of the first or second order realize two or three such combined Silicon electret microphones each including high and low Lowpass and adder needed.
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)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Circuit For Audible Band Transducer (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
Dadurch ist für tiefe Frequenzen auch die Dämpfung der Störsignale, die nicht aus der Vorzugsrichtung einfallen, geringer. Um das Rauschen für den Hörgeräteträger zu reduzieren, wird deshalb bei leisen Eingangspegeln die Richtwirkung ganz weggenommen, so dass das durch ein Richtmikrofon hervorgerufene Rauschen wegfällt. Die Mikrofoncharakteristik entspricht in diesem Fall einem omnidirektionalen Mikrofon.
beeinflusst, weil in diesem Bereich das herkömmliche Elektretmikrofon zur Signalaufnahme verwendet wird.
Claims (7)
- Hörgerät mitdadurch gekennzeichnet, dasseiner ersten Mikrofoneinrichtung (EM) zum Liefern eines ersten Mikrofonsignals,einer zweiten Mikrofoneinrichtung (SM) zum Liefern eines zweiten Mikrofonsignals undeiner Signalverarbeitungseinrichtung (SV, A) zum Erzeugen eines Hörgeräteausgangssignals aus dem ersten und dem zweiten Mikrofonsignal,die erste Mikrofoneinrichtung (EM) ein Elektretmikrofon und die zweite Mikrofoneinrichtung (SM) ein Silizium-Mikrofon umfasst.
- Hörgerät nach Anspruch 1, wobei der ersten Mikrofoneinrichtung (EM) unmittelbar ein Hochpassfilter (HP) nachgeschaltet ist.
- Hörgerät nach Anspruch 1 oder 2, wobei der zweiten Mikrofoneinrichtung (SM) unmittelbar ein Tiefpassfilter (TP) nachgeschaltet ist.
- Hörgerät nach einem der vorhergehenden Ansprüche, wobei die Signalverarbeitungseinrichtung (SV, A) einen Addierer (A) umfasst, mit dem die gegebenenfalls gefilterten Mikrofonsignale addierbar sind.
- Hörgerät nach einem der Ansprüche 1 bis 3, wobei die Signalverarbeitungseinrichtung (SV, A) für das erste und das zweite Mikrofonsignal jeweils einen Analog/Digital-Wandler aufweist, so dass die beiden Mikrofonsignale digital miteinander kombinierbar sind.
- Hörgerät nach einem der vorhergehenden Ansprüche, wobei die erste Mikrofoneinrichtung (EM) mindestens zwei Elektretmikrofone umfasst.
- Hörgerät nach einem der vorhergehenden Ansprüche, wobei die zweite Mikrofoneinrichtung (SM) mindestens zwei Silizium-Mikrofone umfasst.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004010863A DE102004010863B3 (de) | 2004-03-05 | 2004-03-05 | Hörgerät mit mehreren Mikrofonen |
| DE102004010863 | 2004-03-05 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1571880A2 true EP1571880A2 (de) | 2005-09-07 |
| EP1571880A3 EP1571880A3 (de) | 2009-07-29 |
| EP1571880B1 EP1571880B1 (de) | 2010-07-21 |
Family
ID=34745410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05101230A Revoked EP1571880B1 (de) | 2004-03-05 | 2005-02-18 | Hörgerät mit mehreren Mikrofonen |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7756282B2 (de) |
| EP (1) | EP1571880B1 (de) |
| DE (2) | DE102004010863B3 (de) |
| DK (1) | DK1571880T3 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009143434A3 (en) * | 2008-05-23 | 2010-05-27 | Analog Devices, Inc. | Wide dynamic range microphone |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US8233637B2 (en) | 2009-01-20 | 2012-07-31 | Nokia Corporation | Multi-membrane microphone for high-amplitude audio capture |
| JP5872163B2 (ja) | 2011-01-07 | 2016-03-01 | オムロン株式会社 | 音響トランスデューサ、および該音響トランスデューサを利用したマイクロフォン |
| US9380380B2 (en) | 2011-01-07 | 2016-06-28 | Stmicroelectronics S.R.L. | Acoustic transducer and interface circuit |
| DE102020202206A1 (de) * | 2020-02-20 | 2021-08-26 | Sivantos Pte. Ltd. | Verfahren zur Unterdrückung eines Eigenrauschens einer Mikrofonanordnung |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3458668A (en) * | 1966-12-06 | 1969-07-29 | Willco Horgerate Medizinische | Directional hearing aid |
| 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 |
| DE19635229C2 (de) * | 1996-08-30 | 2001-04-26 | Siemens Audiologische Technik | Richtungsempfindliche Hörhilfe |
| JP2003532881A (ja) * | 2000-05-08 | 2003-11-05 | マイクロブリッジ テクノロジーズ インコーポレイテッド | 絶対圧の時間的変動の測定を利用するガス流量センサ、スピーカシステム、およびマイクロホン |
| US20040101153A1 (en) * | 2001-05-08 | 2004-05-27 | Oleg Grudin | Gas flow sensor, speaker system and microphone, utilizing measurement absolute of time-variations in absolute pressure |
| US6870939B2 (en) * | 2001-11-28 | 2005-03-22 | Industrial Technology Research Institute | SMT-type structure of the silicon-based electret condenser microphone |
| DE10316287B3 (de) * | 2003-04-09 | 2004-07-15 | Siemens Audiologische Technik Gmbh | Richtmikrofon |
-
2004
- 2004-03-05 DE DE102004010863A patent/DE102004010863B3/de not_active Expired - Fee Related
-
2005
- 2005-02-18 DE DE502005009928T patent/DE502005009928D1/de not_active Expired - Lifetime
- 2005-02-18 EP EP05101230A patent/EP1571880B1/de not_active Revoked
- 2005-02-18 DK DK05101230.0T patent/DK1571880T3/da active
- 2005-03-03 US US11/073,044 patent/US7756282B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009143434A3 (en) * | 2008-05-23 | 2010-05-27 | Analog Devices, Inc. | Wide dynamic range microphone |
| US8223981B2 (en) | 2008-05-23 | 2012-07-17 | Analog Devices, Inc. | Wide dynamic range microphone |
| US9008323B2 (en) | 2008-05-23 | 2015-04-14 | Invensense, Inc. | Wide dynamic range microphone |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1571880B1 (de) | 2010-07-21 |
| DE102004010863B3 (de) | 2005-10-20 |
| DE502005009928D1 (de) | 2010-09-02 |
| US20050196001A1 (en) | 2005-09-08 |
| US7756282B2 (en) | 2010-07-13 |
| DK1571880T3 (da) | 2010-11-01 |
| EP1571880A3 (de) | 2009-07-29 |
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