EP1406469A2 - Rückopplungskompensator in einem akustischen Verstärkungssystem, Hörhilfsgerät, Verfahren zur Rückopplungskompensation und Anwendung des Verfahrens in einem Hörhilfsgerät - Google Patents
Rückopplungskompensator in einem akustischen Verstärkungssystem, Hörhilfsgerät, Verfahren zur Rückopplungskompensation und Anwendung des Verfahrens in einem Hörhilfsgerät Download PDFInfo
- Publication number
- EP1406469A2 EP1406469A2 EP03021040A EP03021040A EP1406469A2 EP 1406469 A2 EP1406469 A2 EP 1406469A2 EP 03021040 A EP03021040 A EP 03021040A EP 03021040 A EP03021040 A EP 03021040A EP 1406469 A2 EP1406469 A2 EP 1406469A2
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- EP
- European Patent Office
- Prior art keywords
- feedback
- signal
- filter
- path
- compensation
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- 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.)
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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
- H04R25/45—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 feedback compensator in one acoustic amplification system for compensation of a feedback signal, that with an amplification of an input signal due to a feedback path from an amplified one Output signal on the input signal arises.
- the invention furthermore relates to a hearing aid with such a device Feedback compensator, based on a method of compensation a feedback signal in an acoustic amplification system and an application of the method in one Hearing aid.
- a Compensation signal generated by the input signal before the Reinforcement is subtracted and is such that a frequency causing a feedback to a Intensity is reduced below a so-called Stability limit is.
- the generation of the compensation signal takes place along a feedback compensation path an adaptive feedback compensation filter, which by means of an adaptation unit is set and the feedback path replicates.
- a frequency cut filter in the feedback compensation path limits the frequency range, in which the compensation signal is generated.
- the implementation effort of feedback compensators is due to the generation of the feedback equivalent - feedback compensation path considerably.
- the generation of the Feedback compensation signal is usually done with a special adaptive feedback compensation filter, the so-called FIR filter (FIR: Finite Impulse Response).
- FIR filter Finite Impulse Response
- the effect of the FIR filter representative of most Feedback compensation filter, comes with an adaptation unit set, the so-called filter coefficients.
- the adaptation is based on a comparison of an error signal, mostly the input signal, with the amplified output signal.
- An important prerequisite for a successful Adaption is that the two signals before the comparison have experienced at least substantially the same filtering.
- Nodes are required for the construction of a feedback compensator and arithmetic operations in the signal or feedback path, that require space and computing capacity. Furthermore needs one buffer memory to the signal for example by means of Adaptation unit and the feedback compensation filter to edit. The memory takes up space on the hearing aid chip and must be supplied by the hearing aid battery become.
- Various feedback compensators are, for example, from the WO 00/19605 known.
- the bandwidth of the compensation signal limited by the feedback compensation filter generated interference on the amplified output signal minimized and be limited to the unstable frequency range.
- the feedback compensators specified in WO 00/19605 work memory efficient; however, they show complicated Signal or feedback paths with multiple, complex addition arithmetic operations and knots on.
- an input signal is split into three signals. The first both are merged again immediately after each filtering and form the input signal for the hearing aid signal processing.
- This input signal is used before Processing a compensation signal of an adjustable FIR filter subtracted for feedback compensation.
- the third Filtered signal serves an adaptation unit of the feedback compensation filter as an error signal.
- the one generated by the FIR filter Compensation signal not only from the input signal for the hearing aid signal processing subtracts, especially it is also subtracted from the error signal before it becomes the Adaptation unit is supplied.
- This version has three Addition nodes, three splitting nodes and three filters for the compensation of the input signal and is in the implementation accordingly expensive.
- Another version is based on the complex use of two hearing aid signal processing.
- This is an input signal split into two signals.
- the first signal after filtering a first hearing aid signal processing fed.
- the second signal becomes complementary filtered to the first signal before using a compensation signal is merged.
- It then becomes an adaptation unit an adjustable FIR filter as an error signal and on the other hand a second hearing aid signal processing fed.
- the output signal of the second signal processing is filtered on the one hand on the FIR filter and on the adaptation unit is guided and on the other hand it is with one Output signal of the first hearing aid signal processing merged.
- the choice of complementary filter the hearing aid signal processing is based on the complex use of two hearing aid signal processing.
- the invention is based on the object of a feedback compensator, a hearing aid with a feedback compensator, a method for compensating a feedback signal in an acoustic amplification system and use the procedure in a hearing aid to indicate the little Use memory and with a simple structure or Process with just a few nodes and add arithmetic operations.
- This task is accomplished by a feedback compensator in one acoustic amplification system to compensate for a Feedback signal that occurs when an input signal is amplified due to a feedback path from an amplified one Output signal to the input signal arises, solved, an adaptive feedback compensation filter for Formation of a feedback compensation path simulating the feedback path, an adaptation unit for adapting the Feedback compensation filter and a frequency limiting filter to limit the Frequency range of the feedback compensation path includes.
- An input signal path of the input signal points to one Splitting two signal paths, the first signal path a first filter and the second signal path a second Have filters.
- the first signal path is after the first filter at a first node for subtracting a compensation signal with the feedback compensation filter and on one second node for error signal delivery with the adaptation unit operatively connected.
- An exit of the second node and the second signal paths are with a third node for addition connected and an output of this third node is connected to one Input of the amplification system connected.
- a feedback compensator enables the adaptation unit and the feedback compensation filter to supply an output signal filtered with the same filter, so only one buffer memory for feedback compensation necessary is. This is based on the invention Arrangement of the filters, nodes and addition arithmetic operations in the signal path.
- the feedback compensator is also required according to the invention only two addition nodes and Splitting nodes, as well as a complementary filter pair. Corresponding The arrangement can be inexpensive and with little effort be implemented.
- in the Feedback compensation path - only one filter is used to limit the frequency range. This has the advantage of being artifacts in the low frequency Area can be reduced.
- the control of the amplification system takes place regardless of the parameters of the first and the second filter and the frequency limiting filter, because the feedback compensation on the entire amplification system refers. This allows a flexible choice of filters.
- the task regarding a hearing aid is performed by a hearing aid solved that a feedback compensator of the above described type.
- the invention can be used in all known hearing aid types are used, for example in the case of hearing aids worn behind the ear, in the ear portable hearing aids, implantable hearing aids, Hearing aid systems or pocket hearing aids.
- this acts on Multi-channel amplification system, for example from a filter bank consists of the input signal on several frequency specific customized reinforcement systems distributed. This has the advantage that the feedback compensator is all frequency specific adapted reinforcement systems simultaneously.
- the frequency limiting filter between the output of the Amplification system and the feedback compensator and the Adaptation unit arranged. This has the advantage that the Frequency limit filter only on the feedback compensation path acts.
- the feedback compensator In a special embodiment of the feedback compensator have the first filter and the frequency limiting filter an at least essentially the same filter function. The then pass through both inputs to the adaptation unit in the essentially the same filtering, firstly the input signal the first filter and the amplified output signal the frequency limiting filter. This leads to particularly good ones Requirements for a quick and good adaptation by means of the adaptation unit.
- An advantageous embodiment of the method has another procedural feature on that the amplified output signal via the frequency limiting filter to the adaptation unit and passed to the feedback compensation filter becomes. This reduces the influence of the method on frequency ranges, where feedback is rare and diminished there the creation of artifacts.
- the reinforcement performed with a multi-channel amplification system so that the process also has all of its advantages on use a multi-channel amplification system can transmit.
- the task is accomplished by using the method in solved a hearing aid.
- Figure 1 shows a schematic structure of a feedback compensator 1, which is a good quality reinforcement of a acoustic input signal 3 with a hearing aid signal processing 5 allows even if a feedback path 7 is present.
- a feedback path 7 can an output signal 9 together with the acoustic input signal 3 Find entrance to hearing aid signal processing 5.
- the acoustic input signal 3 splits at one Splitting node 11 into two signal components, one in a feedback-prone signal component 13 and the other into a feedback-free signal portion 15.
- Two complementary Filters 17 and 19 carry out the splitting in the frequency domain, so that, for example, the first filter 17 only Transmits frequencies greater than one kilohertz.
- the signal component 13, which is at risk of feedback, is connected to an addition node 21 with an inverted compensation signal 23 summarized.
- the compensation signal 23 is by means of a Feedback compensation filter 25 generated.
- As an entrance in the feedback compensation filter 25 is used with a Frequency limiting filter 27 filtered output signal 29.
- a Adaptation unit 31 changes the coefficients of the feedback compensation filter 25, so the filtered output signal 29 after passing the feedback compensation filter 25 predominantly in the frequency range of energy feedback having.
- a prerequisite for a successful adaptation is a meaningful one Error signal 33. Such is the risk of feedback Signal portion 13 after the merge with the Compensation signal 23 taken and the adaptation unit 31 fed for evaluation.
- the feedback risk Signal portion 13 with the feedback risk Signal portion 15 merged at another node before it reaches the hearing aid signal processing 5. There it will correspond to the hearing loss of the hearing aid wearer amplified and forwarded to a speaker.
- This here executed signal course is particularly advantageous in its sequence, because it needs few nodes and arithmetic operations.
- the feedback path 7 can be based on two feedback mechanisms are based, on the one hand, on acoustic feedback directly from the Speakers on the input microphone and the other on electromagnetic Feedback from a loudspeaker coil, for example on a telephone coil inside a hearing aid.
- the feedback compensator 1 requires only one memory for the filtered output signal 29, since this for processing both the feedback compensation filter 25 and the adaptation unit 31 is forwarded.
- the first filter 17 and the frequency limiting filter 27 set essentially with the same filter function, because then the signal paths to the adaptation unit 31, which with the output signal 9, go through the same filters:
- the output signal 9 passes through the frequency limiting filter 27 and becomes the adaptation unit immediately afterwards 31 fed.
- the compensation signal 23 starting from the amplified output signal 9 first the frequency limiting filter 27 and then the feedback compensation filter 25 has gone through, together with the feedback-prone signal portion 13 of the adaptation unit 31 fed.
- the output signal passes through that along the feedback path 7 to the input signal 3 arrives, which is usually identical to the frequency limiting filter 27 selected first filter 17. In this way is a Feedback compensation system built up on is based on only two addition notes and only one buffer memory needed.
- FIG 2 is a schematic structure of a alternative - use of the feedback compensator 1 shown.
- the difference 1 is the signal processing using a Multi-channel hearing aid signal processing 34 performed.
- the advantage of this embodiment is that the adjustment the multi-channel hearing aid signal processing 34 to the Hearing loss of the hearing aid wearer regardless of the filter function of the frequency limiting filter 27 or the first filter 17 is. Influencing the parameters of multi-channel hearing aid signal processing 34 through the feedback compensator 1 is due to the inventive arrangement of the feedback compensator 1 prevents and allows a separate one Setting the parameters of the multi-channel hearing aid signal processing 34 and the parameters of the feedback compensator 1.
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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)
- Amplifiers (AREA)
Abstract
Description
- FIG 1
- einen schematischen Aufbau eines Rückkopplungskompensators zur Verdeutlichung von Signal- und Rückkopplungskompensationspfad und
- FIG 2
- einen schematischen Aufbau eines Rückkopplungskompensators für den Fall einer Mehrkanalhörhilfsgerätsignalverarbeitung
Claims (10)
- Rückkopplungskompensator (1) in einem akustischen Verstärkungssystem zur Kompensation eines Rückkopplungssignals,
das bei einer Verstärkung eines Eingangssignals aufgrund eines Rückkopplungspfads (7) von einem verstärkten Ausgangssignal (9) auf das Eingangssignal (3) entsteht,
mit einem adaptiven Rückkopplungskompensationsfilter (25) zur Bildung eines den Rückkopplungspfad (7) nachbildenden Rückkopplungskompensationswegs,
mit einer Adaptionseinheit (31) zur Adaption des Rückkopplungskompensationsfilters (25) und
mit einem Frequenzbegrenzungsfilter (27) zur Begrenzung des Frequenzbereichs des Rückkopplungskompensationswegs,
wobei ein Eingangssignalweg des Eingangssignals (3) nach einer Aufspaltung zwei Signalwege aufweist,
wobei der erste Signalweg einen ersten Filter (17) sowie der zweite Signalweg einen zweiten Filter (19) aufweisen,
wobei der erste Signalweg nach dem ersten Filter an einem ersten Knoten zur Subtraktion eines Kompensationssignals (23) mit dem Rückkopplungskompensationsfilter (25) und an einem zweiten Knoten zur Fehlersignalabgabe mit der Adaptionseinheit (31) wirkverbunden ist, und
wobei ein Ausgang des zweiten Knotens und der zweite Signalweg mit einem dritten Knoten zur Addition verbunden sind,
wobei ein Ausgangs des dritten Knotens mit einem Eingang des Verstärkungssystems verbunden ist. - Rückkopplungskompensator (1) nach Anspruch 1,
dadurch gekennzeichnet, dass das Verstärkungssystem ein Mehrkanalverstärkungssystem umfasst. - Rückkopplungskompensator (1) nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Frequenzbegrenzungsfilter (27) zwischen dem Ausgang des Verstärkungssystems und dem Rückkopplungskompensationsfilter (25) angeordnet ist. - Rückkopplungskompensator (1) nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der erste Filter (17) und der Frequenzbegrenzungsfilter (27) eine zumindest im wesentlichen gleiche Filterfunktion aufweisen. - Hörhilfsgerät mit einem Rückkopplungskompensator (1) nach einem der Ansprüche 1 bis 4.
- Verfahren zur Kompensation eines Rückkopplungssignals in einem akustischen System, wobei das Rückkopplungssignal bei einer Verstärkung eines Eingangssignals (3) aufgrund eines Rückkopplungspfads (7) von einem verstärkten Ausgangssignal (9) auf das Eingangssignal (3) entsteht, wobei mittels eines mit einer Adaptionseinheit (31) gesteuerten, adaptiven Rückkopplungskompensationsfilters (25) der Rückkopplungspfad (7) nachgebildet wird, und wobei ein Frequenzbegrenzungsfilter (27) den Frequenzbereich eines den Rückkopplungspfad (7) nachbildenden Rückkopplungskompensationswegs begrenzt, mit folgenden Verfahrensmerkmalen:Aufspalten des Eingangssignals (3) in einen rückkopplungsgefährdeten (13) und in einen rückkopplungsungefährdeten Signalanteil (15).Zusammenführen des rückkopplungsgefährdeten Signalanteils (13) mit einem Kompensationssignal (23) des Rückkopplungskompensationsfilters (25) zu einem rückkopplungskompensierten Signalanteil.Zuführen des rückkopplungskompensierten Signalanteils mit der Adaptionseinheit (31) zur Fehlersignalauswertung.Zusammenführen des rückkopplungsungefährdeten (15) mit dem rückkopplungskompensierten Signalanteil zu einem rückkopplungskompensierten Signal, das anschließend verstärkt wird.
- Verfahren nach Anspruch 6, wobei das verstärkte Ausgangssignal (9) über den Frequenzbegrenzungsfilter (27) an die Adaptionseinheit (31) und an den Rückkopplungskompensationsfilter (25) geleitet wird.
- Verfahren nach Anspruch 6 oder 7, wobei der rückkopplungsgefährdete Signalanteil (13) und der Rückkopplungskompensationsweg zumindest näherungsweise auf den gleichen Frequenzbereich beschränkt werden.
- Verfahren nach einem der Ansprüche 6 bis 8, wobei die Verstärkung mit einem Mehrkanalverstärkungssystem durchgeführt wird.
- Anwendung des Verfahrens nach einem der Ansprüche 1 bis 9 in einem Hörhilfsgerät.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10245667 | 2002-09-30 | ||
DE10245667A DE10245667B4 (de) | 2002-09-30 | 2002-09-30 | Rückkopplungkompensator in einem akustischen Verstärkungssystem, Hörhilfsgerät, Verfahren zur Rückkopplungskompensation und Anwendung des Verfahrens in einem Hörhilfsgerät |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1406469A2 true EP1406469A2 (de) | 2004-04-07 |
EP1406469A3 EP1406469A3 (de) | 2008-03-26 |
EP1406469B1 EP1406469B1 (de) | 2010-04-07 |
Family
ID=31984303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03021040A Revoked EP1406469B1 (de) | 2002-09-30 | 2003-09-17 | Rückkopplungskompensator in einem akustischen Verstärkungssystem, Hörhilfsgerät, Verfahren zur Rückkopplungskompensation und Anwendung des Verfahrens in einem Hörhilfsgerät |
Country Status (5)
Country | Link |
---|---|
US (2) | US6931137B2 (de) |
EP (1) | EP1406469B1 (de) |
AT (1) | ATE463934T1 (de) |
DE (2) | DE10245667B4 (de) |
DK (1) | DK1406469T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1718113A3 (de) * | 2005-04-25 | 2009-11-04 | Siemens Audiologische Technik GmbH | Hörhilfevorrichtung mit Kompensation von akustischen und elektromagnetischen Rückkopplungssignalen |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6876751B1 (en) * | 1998-09-30 | 2005-04-05 | House Ear Institute | Band-limited adaptive feedback canceller for hearing aids |
DK1119218T3 (en) * | 2000-01-21 | 2018-09-10 | Oticon As | Electromagnetic feedback reduction in a communication device |
US20040231862A1 (en) * | 2003-05-22 | 2004-11-25 | Kirn Michael D. | Corrosion monitoring station |
KR100678770B1 (ko) * | 2005-08-24 | 2007-02-02 | 한양대학교 산학협력단 | 궤환 신호 제거 기능을 구비한 보청기 |
US20070183609A1 (en) * | 2005-12-22 | 2007-08-09 | Jenn Paul C C | Hearing aid system without mechanical and acoustic feedback |
DE102006020832B4 (de) * | 2006-05-04 | 2016-10-27 | Sivantos Gmbh | Verfahren zum Unterdrücken von Rückkopplungen bei Hörvorrichtungen |
US8280088B2 (en) * | 2006-05-19 | 2012-10-02 | Siemens Audiologische Technik Gmbh | Hearing apparatus with feedback detection and corresponding method |
EP1976334A3 (de) * | 2007-03-29 | 2016-10-05 | Sivantos GmbH | Verfahren zur Anpassung eines Hörgeräts mit einer Normalisierung von Verarbeitungswerten |
JP5136396B2 (ja) * | 2008-12-25 | 2013-02-06 | ヤマハ株式会社 | ハウリング抑制装置 |
DE102009031135A1 (de) * | 2009-06-30 | 2011-01-27 | Siemens Medical Instruments Pte. Ltd. | Hörvorrichtung und Verfahren zur Unterdrückung von Rückkopplungen |
EP2284833A1 (de) * | 2009-08-03 | 2011-02-16 | Bernafon AG | Verfahren zur Überwachung des Einflusses von Umgebungsgeräuschen auf ein adaptives Filter zur akustischen Rückkoplungsunterdrückung |
Citations (1)
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WO2000019605A2 (en) | 1998-09-30 | 2000-04-06 | House Ear Institute | Band-limited adaptive feedback canceller for hearing aids |
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DE1969580U (de) | 1967-04-25 | 1967-09-28 | Josef Steinke Maschinen Und Za | Stechstahl fuer rohrschneider zum abstechen von eternit- und kunststoffrohr. |
WO1995028034A2 (en) * | 1994-04-12 | 1995-10-19 | Philips Electronics N.V. | Signal amplifier system with improved echo cancellation |
DE19635878A1 (de) * | 1996-09-04 | 1998-03-05 | Deutsche Telekom Ag | Vorrichtung zur Verbesserung des Sendesignals einer Echoreduktionseinrichtung |
DE19639580C2 (de) * | 1996-09-26 | 1998-09-17 | Deutsche Telekom Ag | Vorrichtung zur Reduktion akustischer Echos |
DE19714966C2 (de) * | 1997-04-10 | 1999-04-01 | Siemens Ag | Vorrichtung zur Rückhördämpfung |
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 |
DE19805942C1 (de) | 1998-02-13 | 1999-08-12 | Siemens Ag | Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen |
US6434247B1 (en) * | 1999-07-30 | 2002-08-13 | Gn Resound A/S | Feedback cancellation apparatus and methods utilizing adaptive reference filter mechanisms |
EP1191814B2 (de) * | 2000-09-25 | 2015-07-29 | Widex A/S | Multiband-Hörgerät mit multiband adaptiv Filter zur Unterdrückung akustischer Rückkopplung. |
US20040029525A1 (en) * | 2002-08-05 | 2004-02-12 | Sun Microsystems, Inc. | Tuning engine and user interface for internet broadcasts on mobile devices |
AU2002951909A0 (en) * | 2002-10-04 | 2002-10-24 | Tenix Industries Pty Limited | A method of adaptively interfacing with data repository |
-
2002
- 2002-09-30 DE DE10245667A patent/DE10245667B4/de not_active Expired - Fee Related
-
2003
- 2003-09-17 AT AT03021040T patent/ATE463934T1/de not_active IP Right Cessation
- 2003-09-17 EP EP03021040A patent/EP1406469B1/de not_active Revoked
- 2003-09-17 DK DK03021040.5T patent/DK1406469T3/da active
- 2003-09-17 DE DE50312584T patent/DE50312584D1/de not_active Expired - Lifetime
- 2003-09-30 US US10/675,305 patent/US6931137B2/en not_active Expired - Lifetime
-
2004
- 2004-12-17 US US11/015,163 patent/US7174027B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000019605A2 (en) | 1998-09-30 | 2000-04-06 | House Ear Institute | Band-limited adaptive feedback canceller for hearing aids |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1718113A3 (de) * | 2005-04-25 | 2009-11-04 | Siemens Audiologische Technik GmbH | Hörhilfevorrichtung mit Kompensation von akustischen und elektromagnetischen Rückkopplungssignalen |
US7844063B2 (en) | 2005-04-25 | 2010-11-30 | Siemens Audiologische Technik Gmbh | Hearing and apparatus with compensation of acoustic and electromagnetic feedback signals |
Also Published As
Publication number | Publication date |
---|---|
DE50312584D1 (de) | 2010-05-20 |
EP1406469B1 (de) | 2010-04-07 |
ATE463934T1 (de) | 2010-04-15 |
DE10245667A1 (de) | 2004-04-15 |
US7174027B2 (en) | 2007-02-06 |
DE10245667B4 (de) | 2004-12-30 |
US20040101147A1 (en) | 2004-05-27 |
EP1406469A3 (de) | 2008-03-26 |
DK1406469T3 (da) | 2010-08-02 |
US6931137B2 (en) | 2005-08-16 |
US20050135646A1 (en) | 2005-06-23 |
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