EP1458216A2 - Vorrichtung und Verfahren zur Adaption von Hörgerätemikrofonen - Google Patents
Vorrichtung und Verfahren zur Adaption von Hörgerätemikrofonen Download PDFInfo
- Publication number
- EP1458216A2 EP1458216A2 EP04003637A EP04003637A EP1458216A2 EP 1458216 A2 EP1458216 A2 EP 1458216A2 EP 04003637 A EP04003637 A EP 04003637A EP 04003637 A EP04003637 A EP 04003637A EP 1458216 A2 EP1458216 A2 EP 1458216A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- microphone
- microphones
- amplitude
- output signal
- polynomial
- 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
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
- H04R29/005—Microphone arrays
-
- 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
Definitions
- the present invention relates to a mutual method Adaptation of several microphones of one hearing aid. About that the present invention also relates to a corresponding one Device for adapting the microphones.
- Directional microphones are sensitive to upsets the transfer functions of the microphones by amount and Phase.
- the sensitivity to upset increases the order of the directional microphone system and with falling frequency.
- Such directional microphone systems are used at low frequencies most sensitive.
- a microphone at low frequencies by one First order high pass can be determined.
- a first microphone 1 can be activated by a Characterize the high pass with the transfer function s / s-pol_ac1.
- the microphone 1 picks up a first input signal 2.
- This input signal filtered with the high pass filter of the microphone 1 2 is using a first compensation filter 3 converted into a first microphone output signal 4.
- the Compensation filter 3 has the transfer function s-pol_ac1 / s-pol_ideal. Both numerator and denominator can be used as Polynomial.
- the counter polynomial of the compensation filter 3 is chosen so that it corresponds to the denominator polynomial of the acoustic high pass of the microphone 1 corresponds.
- the denominator polynomial of the compensation filter 3 corresponds to the denominator polynomial the high pass of an ideal microphone.
- the specific high pass with the transfer function s / s-pol_ac2 of the second microphone 5 a second compensation filter 6 with the transfer function s-pol_ac2 / s-pol_ideal compensated so that from the second Microphone input signal 7 a corresponding second microphone output signal 8 arises.
- the denominator polynomial of the high pass 5 by the counter polynomial of the second Compensation filter 6 eliminated.
- the object of the present invention is that Simplify compensation of microphone differences in hearing aids.
- this object is achieved by a method for mutual adaptation of several microphones of a hearing aid, by measuring a first amplitude of a first output signal from a first of the several microphones in one predetermined frequency range, measuring a second amplitude a second output signal from a second one of the plurality Microphones in the specified frequency range and filtering the first output signal as a function of the first amplitude and the second amplitude, so the difference between the two output signals is reduced.
- a device for mutual adaptation of several microphones of a hearing aid with a first measuring device for measuring a first amplitude a first output signal from a first one of the plurality Microphones in a given frequency range, one second measuring device for measuring a second amplitude a second output signal from a second one of the plurality Microphones in the specified frequency range and a filter device, to the first and second measuring devices is connected to filter the first output signal in Dependence on the first amplitude and the second amplitude, so the difference between the two output signals is reducible.
- a compensation filter in a microphone path the reference path.
- One compensation filter each is in every path except the reference path, contain. This means that for example with three microphones to provide a compensation filter in two microphone paths while the third microphone path is the reference path is used.
- the predetermined frequency range preferably corresponds to measuring the amplitudes of the two output signals of the microphones a frequency band below 150 Hz.
- the frequency band is between 40 and 60 Hz or 80 to 120 Hz. This is the area where there are differences in the Corner frequency of the high-pass filter of the microphones is particularly strong to make noticable.
- the filtering can be adjusted by a control loop, so that the first and second amplitudes correspond to each other. This makes it possible to change the transfer function over time of the microphones, for example due to dirt or counteract aging effectively.
- the compensation filtering can be divided into two partial filterings become.
- a first partial filtering is done by a Denominator polynomial, which is the high pass frequency of the reference path modeled, realized.
- a second sub-filter is replaced by a Counter polynomial that is adapted so that the averaged level difference between the microphone paths is minimal.
- the adaptation takes place through the formation of the amount of the signals instead, which eliminates phase dependency. So that can to a unit like the "acoustical delay" mentioned above compensation "block.
- the coefficients of the counter polynomial are only dependent on a single parameter. This leads to one little effort for adaptation. Is just the counter polynomial adaptable, this does not lead to identical in principle same microphone signals because of an error between the Characteristic of the reference microphone and that in the denominator polynomial described filter effect can exist. The effect of this good approximation is sufficient to directivity to improve significantly with minimal effort.
- the amount and / or Phase of the first output signal are modified. In order to the setting of the directional microphone can be improved.
- each Microphone can be characterized by a characteristic in the low-frequency range acoustic high pass, whose corner frequency is about 50 Hz and an electrical high pass, whose corner frequency is about 100 Hz. Both the acoustic as well as the electrical high passes of the several hearing aid microphones are slightly different and can be adapted to each other in the following way.
- the microphone input signal 2 with an acoustic high pass 1 of the first Filtered microphone 1 with the transfer function s / s-pol_ac1 becomes.
- the subsequent compensation filter 3 ' has the transfer function s-pol_ac1 / s-pol_ac2.
- This Transfer function becomes the second microphone path, which in FIG 2 is shown below, taken into account.
- the second microphone path is the signal as in the prior art 7 of a reference microphone 5 corresponding to high-pass filtering subjected to the transfer function s / s-pol_ac2.
- the denominator polynomial of the second acoustic high pass of the second microphone 5 is used to standardize the compensation filter 3 'used in the first microphone path. With this standardization the compensation filter 3 'does not have to be ideal Microphone can be normalized to the first microphone output signal 4 to get. In the second microphone path, this can result in a Compensation filters are dispensed with the second microphone output signal 8 to get.
- the compensation filter 3 ' has a transfer function with a numerator polynomial s-pol_ac1 and a denominator polynomial s-pol_ac2. With simplified compensation, only the Numerator and not the denominator and the numerator adjusted.
- the denominator of the compensation filter 3 ' is at a nominal frequency established. In the acoustic case, the nominal frequency is at 50 Hz and in the electrical case at 100 Hz. With this fixed nominal frequency is however only an approximation Compensation possible. This approximate compensation is as mentioned, sufficiently good, for example, for directivity of a directional microphone.
- the functions p 1 and p 0 and the parameter q 0 result from the European patent application EP 0982971 A2 mentioned at the beginning.
- the variable z represents the frequency variable of the microphone input signal.
- the parameter Xp corresponds to a manipulated variable of the compensation filter. The denominator cannot be varied in this simplified approach.
- an improved adaptation of the compensation filter results from the fact that the denominator in its transfer function can also be varied as follows by means of a parameter Xq: p 1 ( X p ) ⁇ z + p 0 ( X p ) z + q 0 ( X p )
- FIG 3 An implementation to adapt the high pass of a microphone according to the first embodiment, in which the denominator of the Transfer function of the compensation filter is fixed shown in FIG 3 as a block diagram.
- the input unit forms the compensation filter 3 ', which is already related was explained with FIG 2.
- Input signal is also here the signal 2 of a first microphone, with this representation in contrast to FIG 2 on the reproduction of an acoustic High pass, which represents the microphone, is dispensed with has been.
- a subsequent bandpass filter 12 there is a frequency range between 40 and 60 Hz from the output signal of the multiplication unit 10 cut out and a level meter 13 fed. There is the level of the frequency range to be analyzed determined from the signal of the first microphone 2.
- a band pass 14 also cuts the frequency range between 40 and 60 Hz from the output signal of the microphone and delivers the filtered signal also to a level meter 15.
- a subtraction unit those from the level meters 13 and 15 measured levels subtracted from each other and the resulting level difference for an update unit for updating the Xp variable.
- An update of the Xp value should, however, only take place if the microphone signals have a correspondingly high level.
- the microphone levels become an input level query block 18 fed, which generates an enable Xp signal when both signal levels exceed a certain threshold. Thereby can be prevented in cases where no acoustic input signals but only microphone noise there is a microphone adaptation.
- the enable Xp signal is therefore looped through to the Xp update block.
- the value Xp possibly updated in block 17 is now to complete the control loop on the compensation filter 3 'delivered.
- the determination of the Xp value and thus the adaptation of the microphones to one another in the Xp update block 17 can be achieved by a (N) LMS (Normalized Leased Meansquare), whereby an "acoustical delay" block is necessary is.
- FIG. 4 shows a circuit diagram of an improved version of a matching circuit.
- the essential structure corresponds to that of FIG. 3, the function blocks corresponding to one another performing essentially the same functions.
- the output signal of the input level interrogation block 18, with which it is determined whether the two microphone signals have a sufficiently high level is forwarded to a switch 19.
- This switch 19 alternately generates an enable-X q signal and an enable-X p signal if it receives an enable-X p -X q signal from block 18.
- an Xq update block 20 for changing or updating the X q value is consequently also provided here. If the switch 19 now emits an enable-X q signal, the X q value is changed in accordance with the level difference from the subtractor 16. Otherwise, if the switch 19 emits an enable X p signal, the X p value in the X p update block 17 is changed in accordance with the level difference. If the level difference is less than 0, the X p or X q value is changed in one direction, and if the level difference is greater than 0 in the corresponding other direction.
- the compensation filter 3 receives the changed or updated X p and X q values as manipulated variables.
- the different high-pass corner frequencies of the microphones in a narrow frequency range around the corner frequencies mean different averaged output levels of the two microphone signals. This means that the level difference depends directly on the difference in the corner frequencies. To adapt the cutoff frequencies, the difference between the levels is simply formed (power difference).
- the total distance of a directional microphone from the microphone input up to the exit is often with other at low frequencies First-order high passes described.
- the microphone still has an electrical one First-order high-pass filter with a corner frequency of approx. 180 Hz.
- Another high pass results from a coupling capacitor and input resistance of an IC input stage.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Neurosurgery (AREA)
- Circuit For Audible Band Transducer (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Transmitters (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
- FIG 1
- ein Blockschaltbild zur Kompensation von Verschiebungen von Hochpasseckfrequenzen gemäß dem Stand der Technik;
- FIG 2
- ein Blockschaltbild zur Kompensation von Verschiebungen von Hochpasseckfrequenzen gemäß der vorliegenden Erfindung;
- FIG 3
- ein Schaltungsdiagramm einer Kompensationsschaltung gemäß einer ersten Ausführungsform der vorliegenden Erfindung; und
- FIG 4
- ein Schaltungsdiagramm einer Kompensationsschaltung gemäß einer zweiten Ausführungsform der vorliegenden Erfindung.
Claims (16)
- Verfahren zur wechselseitigen Adaption mehrerer Mikrofone (1, 5) eines Hörgeräts,
gekennzeichnet durchMessen (13) einer ersten Amplitude eines ersten Ausgangssignals von einem ersten der mehreren Mikrofone (1) in einem vorgegebenen Frequenzbereich (12),Messen (15) einer zweiten Amplitude eines zweiten Ausgangssignals von einem zweiten der mehreren Mikrofone (5) in dem vorgegebenen Frequenzbereich (14) undFiltern (3') des ersten Ausgangssignals in Abhängigkeit von der ersten Amplitude und der zweiten Amplitude, so dass die Differenz (16) zwischen den beiden Ausgangssignalen reduziert wird. - Verfahren nach Anspruch 1, wobei der vorgegebene Frequenzbereich (12, 14) einem oder mehreren Frequenzbändern unterhalb von 150 Hz entspricht.
- Verfahren nach Anspruch 2, wobei das Frequenzband/die Frequenzbänder zwischen 40 und 60 Hz und/oder 80 bis 120 Hz liegt.
- Verfahren nach einem der Ansprüche 1 bis 3, wobei Parameter zum Filtern (3') in einer Regelschleife derart angepasst werden, so dass die erste und zweite Amplitude einander entsprechen.
- Verfahren nach einem der Ansprüche 1 bis 4, wobei das Filtern (3') durch Multiplizieren mit einem Nenner- und Zählerpolynom erfolgt.
- Verfahren nach Anspruch 5, wobei ausschließlich das Zählerpolynom durch eine Regelung variiert wird.
- Verfahren nach Anspruch 5, wobei das Zähler- und Nennerpolynom durch Regelung variiert werden.
- Verfahren nach einem der Ansprüche 1 bis 7, wobei durch das Filtern Betrag und/oder Phase des ersten Ausgangssignals modifiziert wird.
- Vorrichtung zur wechselseitigen Adaption mehrerer Mikrofone (1, 5) eines Hörgeräts,
gekennzeichnet durcheine erste Messeinrichtung (13) zum Messen einer ersten Amplitude eines ersten Ausgangssignals von einem ersten der mehreren Mikrofone (1) in einem vorgegebenen Frequenzbereich (12),eine zweite Messeinrichtung (15) zum Messen einer zweiten Amplitude eines zweiten Ausgangssignals von einem zweiten der mehreren Mikrofone (5) in dem vorgegebenen Frequenzbereich (14) undeine Filtereinrichtung (3'), die an die erste und zweite Messeinrichtung (13, 15) angeschlossen ist, zum Filtern des ersten Ausgangssignals in Abhängigkeit von der ersten Amplitude und der zweiten Amplitude, so dass die Differenz (16) zwischen den beiden Ausgangssignalen reduzierbar ist. - Vorrichtung nach Anspruch 9, wobei der vorgegebene Frequenzbereich (12, 14) einem oder mehreren Frequenzbändern unterhalb von 150 Hz entspricht.
- Vorrichtung nach Anspruch 10, wobei das Frequenzband/die Frequenzbänder zwischen 40 und 60 Hz und/oder 80 bis 120 Hz liegt.
- Vorrichtung nach einem der Ansprüche 9 bis 11, wobei die Filtereinrichtung (3') in einer Regelschleife derart anpassbar ist, dass erste und zweite Amplitude einander entsprechen.
- Vorrichtung nach einem der Ansprüche 9 bis 12, wobei die Filtereinrichtung (3') durch ein Nenner- und Zählerpolynom modellierbar ist.
- Vorrichtung nach Anspruch 13, wobei ausschließlich das Zählerpolynom variierbar ist.
- Vorrichtung nach Anspruch 13, wobei das Zähler- und Nennerpolynom variierbar sind.
- Vorrichtung nach einem der Ansprüche 9 bis 15, wobei mit der Filtereinrichtung Betrag und/oder Phase des ersten Ausgangssignals modifizierbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10310580 | 2003-03-11 | ||
DE10310580A DE10310580A1 (de) | 2003-03-11 | 2003-03-11 | Vorrichtung und Verfahren zur Adaption von Hörgerätemikrofonen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1458216A2 true EP1458216A2 (de) | 2004-09-15 |
EP1458216A3 EP1458216A3 (de) | 2005-12-14 |
EP1458216B1 EP1458216B1 (de) | 2008-08-06 |
Family
ID=32748191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04003637A Expired - Lifetime EP1458216B1 (de) | 2003-03-11 | 2004-02-18 | Vorrichtung und Verfahren zur Adaption von Hörgerätemikrofonen |
Country Status (5)
Country | Link |
---|---|
US (1) | US7254245B2 (de) |
EP (1) | EP1458216B1 (de) |
AT (1) | ATE404032T1 (de) |
DE (2) | DE10310580A1 (de) |
DK (1) | DK1458216T3 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006021555A1 (en) * | 2004-08-24 | 2006-03-02 | Oticon A/S | Low frequency phase matching for microphones |
WO2006042540A1 (en) * | 2004-10-19 | 2006-04-27 | Widex A/S | System and method for adaptive microphone matching in a hearing aid |
EP1773098A1 (de) * | 2005-10-06 | 2007-04-11 | Oticon A/S | Vorrichtung und Verfahren zur Anpassung von Mikrofonen |
RU2449497C1 (ru) * | 2008-01-31 | 2012-04-27 | Квэлкомм Инкорпорейтед | Оповещение пользователя о прикрытии микрофона |
EP3852388A1 (de) * | 2020-01-17 | 2021-07-21 | Sivantos Pte. Ltd. | Verfahren zur abstimmung der jeweiligen phasengänge eines ersten mikrofones und eines zweiten mikrofons |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8031881B2 (en) | 2007-09-18 | 2011-10-04 | Starkey Laboratories, Inc. | Method and apparatus for microphone matching for wearable directional hearing device using wearer's own voice |
US9838783B2 (en) * | 2015-10-22 | 2017-12-05 | Cirrus Logic, Inc. | Adaptive phase-distortionless magnitude response equalization (MRE) for beamforming applications |
CN108235818B (zh) * | 2018-01-05 | 2020-02-21 | 万魔声学科技有限公司 | 主动降噪方法、设备及耳机 |
US11070907B2 (en) | 2019-04-25 | 2021-07-20 | Khaled Shami | Signal matching method and device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0982971A2 (de) * | 1998-08-25 | 2000-03-01 | Knowles Electronics, Inc. | Vorrichtung und Verfahren zur Anpassung Phasen und Amplituden-Frequenzgang eines Mikrofon |
EP1191817A1 (de) * | 2000-09-22 | 2002-03-27 | GN ReSound as | Hörhilfegerät mit adaptiver Mikrofonanpassung |
Family Cites Families (9)
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US5402496A (en) * | 1992-07-13 | 1995-03-28 | Minnesota Mining And Manufacturing Company | Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adaptive filtering |
US5550923A (en) | 1994-09-02 | 1996-08-27 | Minnesota Mining And Manufacturing Company | Directional ear device with adaptive bandwidth and gain control |
DE19810043A1 (de) * | 1998-03-09 | 1999-09-23 | Siemens Audiologische Technik | Hörgerät mit einem Richtmikrofon-System |
DE19814180C1 (de) * | 1998-03-30 | 1999-10-07 | Siemens Audiologische Technik | Digitales Hörgerät sowie Verfahren zur Erzeugung einer variablen Richtmikrofoncharakteristik |
DE19849739C2 (de) * | 1998-10-28 | 2001-05-31 | Siemens Audiologische Technik | Adaptives Verfahren zur Korrektur der Mikrofone eines Richtmikrofonsystems in einem Hörgerät sowie Hörgerät |
DE19918883C1 (de) | 1999-04-26 | 2000-11-30 | Siemens Audiologische Technik | Hörhilfegerät mit Richtmikrofoncharakteristik |
DE19927278C1 (de) * | 1999-06-15 | 2000-12-14 | Siemens Audiologische Technik | Verfahren zum Anpassen eines Hörhilfegeräts sowie Hörhilfegerät |
DK1198974T3 (da) * | 1999-08-03 | 2003-06-23 | Widex As | Høreapparat med adaptiv tilpasning af mikrofonerne |
DE19955156A1 (de) * | 1999-11-17 | 2001-06-21 | Univ Karlsruhe | Verfahren und Vorrichtung zur Unterdrückung eines Störsignalanteils im Ausgangssignal eines Schallwandlermittels |
-
2003
- 2003-03-11 DE DE10310580A patent/DE10310580A1/de not_active Withdrawn
-
2004
- 2004-02-18 DE DE502004007757T patent/DE502004007757D1/de not_active Expired - Lifetime
- 2004-02-18 EP EP04003637A patent/EP1458216B1/de not_active Expired - Lifetime
- 2004-02-18 DK DK04003637T patent/DK1458216T3/da active
- 2004-02-18 AT AT04003637T patent/ATE404032T1/de not_active IP Right Cessation
- 2004-03-11 US US10/798,179 patent/US7254245B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0982971A2 (de) * | 1998-08-25 | 2000-03-01 | Knowles Electronics, Inc. | Vorrichtung und Verfahren zur Anpassung Phasen und Amplituden-Frequenzgang eines Mikrofon |
EP1191817A1 (de) * | 2000-09-22 | 2002-03-27 | GN ReSound as | Hörhilfegerät mit adaptiver Mikrofonanpassung |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006021555A1 (en) * | 2004-08-24 | 2006-03-02 | Oticon A/S | Low frequency phase matching for microphones |
WO2006042540A1 (en) * | 2004-10-19 | 2006-04-27 | Widex A/S | System and method for adaptive microphone matching in a hearing aid |
US8374366B2 (en) | 2004-10-19 | 2013-02-12 | Widex A/S | System and method for adaptive microphone matching in a hearing aid |
EP1773098A1 (de) * | 2005-10-06 | 2007-04-11 | Oticon A/S | Vorrichtung und Verfahren zur Anpassung von Mikrofonen |
US7831053B2 (en) | 2005-10-06 | 2010-11-09 | Oticon A/S | System and method for matching microphones |
AU2006225279B2 (en) * | 2005-10-06 | 2010-12-16 | Oticon A/S | A system and method for matching microphones |
RU2449497C1 (ru) * | 2008-01-31 | 2012-04-27 | Квэлкомм Инкорпорейтед | Оповещение пользователя о прикрытии микрофона |
US8374362B2 (en) | 2008-01-31 | 2013-02-12 | Qualcomm Incorporated | Signaling microphone covering to the user |
EP3852388A1 (de) * | 2020-01-17 | 2021-07-21 | Sivantos Pte. Ltd. | Verfahren zur abstimmung der jeweiligen phasengänge eines ersten mikrofones und eines zweiten mikrofons |
US11234084B2 (en) | 2020-01-17 | 2022-01-25 | Sivantos Pte. Ltd. | Method of adjusting the respective phase responses of a first microphone and a second microphone |
Also Published As
Publication number | Publication date |
---|---|
DE502004007757D1 (de) | 2008-09-18 |
DE10310580A1 (de) | 2004-10-07 |
EP1458216A3 (de) | 2005-12-14 |
ATE404032T1 (de) | 2008-08-15 |
EP1458216B1 (de) | 2008-08-06 |
US7254245B2 (en) | 2007-08-07 |
DK1458216T3 (da) | 2008-11-24 |
US20040228495A1 (en) | 2004-11-18 |
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