EP1571881A2 - Verfahren und Vorrichtung zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons - Google Patents
Verfahren und Vorrichtung zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons Download PDFInfo
- Publication number
- EP1571881A2 EP1571881A2 EP05101246A EP05101246A EP1571881A2 EP 1571881 A2 EP1571881 A2 EP 1571881A2 EP 05101246 A EP05101246 A EP 05101246A EP 05101246 A EP05101246 A EP 05101246A EP 1571881 A2 EP1571881 A2 EP 1571881A2
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- microphone
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 17
- 230000006978 adaptation Effects 0.000 description 8
- 230000004044 response Effects 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000001934 delay Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
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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
- 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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
- H04R29/005—Microphone arrays
- H04R29/006—Microphone matching
Definitions
- the present invention relates to a method of adaptation the phases of microphones of a directional microphone from a hearing aid. Moreover, the present invention relates to a corresponding device for adjusting the phases.
- the directivity of differential multi-microphone systems depends crucially depends on how well the microphones used in their amplitude and phase response match. Only if the Microphones amplify incoming signals in a frequency-dependent manner and delay, can by subtraction the microphone signals an exact cancellation in one or several directions (spatial Notches) are generated.
- the amplitudes of the microphones used become one of the microphones that you define as a reference microphone, equalized.
- the for adjusting / readjusting the microphones necessary amplification factors are formed by quotient the time-averaged amplitudes of the microphone signals and the reference microphone signal.
- FIG. 1 In the left part of FIG. 1, a loudspeaker L is shown shown, the frontal two microphones M1 and M2 sonicated.
- the microphone M1 provides an output signal x1.
- the output signal of the second microphone M2 is structurally conditioned by ⁇ T delayed, so that an output signal x2 results.
- the same signals x1 and x2 are determined by the arrangement in the right half of FIG 1 obtained. Since the speaker L of the second microphone M2 is further away, has the signal x2 due to the sound propagation time between the microphone M1 and the microphone M2 against the signal x1 a delay or a phase difference. A phase or delay fit So the two microphones is not possible if the position of the speaker is unknown.
- the object of the present invention is therefore to an effective phase adjustment even without knowledge of the position to be able to carry out the sound source with a directional microphone.
- this object is achieved by a method for adjusting the phases of microphones of a hearing aid optical microphone to each other by measuring or predetermining a first Level of an omnidirectional signal of the directional microphone, Measuring a second level of a directional signal of the directional microphone and adjusting the second level to the first level by changing the propagation time of an output signal from one the microphone of the directional microphone without consideration of one Position information about a sound source.
- a corresponding device for adjusting the phases of microphones of a hearing aid mic with each other Measuring device for measuring or predetermining a first level an omnidirectional signal of the directional microphone and the Measuring a second level of a directional signal of the directional microphone and a fitting device for adjusting the second Level to the first level by changing the runtime of a Output signal from one of the microphones of the directional microphone without consideration of position information about a Sound source.
- the above object is achieved by a method for adjusting the phases of microphones of a hearing aid light microphone to each other by specifying a maximum Delay difference between a first output signal of a first microphone and a second output of a second microphone of the directional microphone, measuring an actual transit time difference the two output signals and delay one of the two output signals, so that the actual transit time difference not greater than the maximum runtime difference is.
- a device for fitting is also provided the phases of microphones of a hearing aid light microphone to each other with a provisioning means for providing a maximum runtime difference between one first output of a first microphone and a second output signal of a second microphone of the directional microphone, a measuring device for measuring an actual transit time difference the two output signals and a delay device for delaying one of the two output signals, so the actual runtime difference is not greater than the maximum runtime difference is.
- the adjustment of the microphone phases by Determine the difference of the first level of the omnidirectional Signal and the second level of the directional signal and minimize this difference.
- the advantage of this is that the level difference can be easily determined, so that is a Phase adaptation can be carried out easily.
- the maximum transit time difference is the sound transit time from the first to the second microphone specified. This allows the individual positioning of the Microphones in the hearing aid are exactly taken into account.
- the value of the maximum runtime difference can be in one be provided special memory. This store can also be described arbitrarily, so that the circuit suitable for phase adjustment for any microphone spacing is.
- FIG. 4 shows several directional diagrams shown, which differ in different propagation delays of microphones of the directional microphone.
- a directional diagram is shown at a time difference or a phase delay of the microphone signals from each other by 0.3 T0 lets, where T0 is the duration of the sound from a microphone to the other corresponds.
- the 0dB line in the polar diagram corresponds to the omnidirectional signal.
- An ideal directional diagram a differential directional microphone would have the form a 8. Due to the maturity phase difference of the Both microphones, the 8-shape is slightly deformed.
- the guideline cuts the 0dB line.
- the level of the directional microphone is above the 0dB line, i. above the level of the omnidirectional Microphone.
- the directional diagram of the directional microphone is further deformed, as shown in the upper right image of FIG 4 is.
- the area in which the directional signal is higher than that omnidirectional signal is, in this case lies between about 285 ° and 75 °.
- this range is between about 240 ° and 120 °, as shown in the lower left image of FIG. 4 is reproduced.
- the directional signal is always above the omnidirectional signal, what in the right lower directional diagram of FIG 4 through a circulating circle is indicated.
- the minimum and maximum directional signals S min and S max are shown as a function of the phase shift.
- the signal of an omnidirectional microphone S omni is drawn on the 0dB line.
- the maximum signal is 0dB and thus corresponds to the omnidirectional signal.
- the minimum signal is very low and is below -30 dB.
- the directional signals S min and S max are above the 0 dB line, as already explained for the specific phase delay of 2.3 T 0 in the lower right-hand directional diagram of FIG ,
- a first embodiment of the present invention therefore, it is checked whether the level of the output signal of the differential directional microphone is higher than that of the omnidirectional signal. If this is the case, this level difference is minimized by adaptive, frequency-selective delay compensation in individual frequency bands and thus a phase matching or a phase matching of the microphones is achieved.
- An ideal adaptation is possible if the signal waves are at some point during the adaptation in the 0 ° direction to the directional microphone. In this situation, the overshoot of the output signal of the differential directional microphone relative to the omnidirectional signal is greatest since the directional signal then corresponds to the signal S max of FIG. 5 (compare also the directional diagrams of FIG.
- FIG. 1 A basic circuit diagram for this method is shown in FIG.
- the microphone output signals x1 and x2 of the microphones M1 and M2 are first subjected to a directional processing DV according to the principle of FIG.
- the output signal X2 is delayed by the delay unit D for phase matching by the delay .DELTA.T.
- T0 means the sound propagation time between the two microphones and a, an adaptive control parameter.
- the resulting signal y2 '(t) is then also estimated in level by a level estimator PSO.
- the two estimated levels are in a comparison unit V compared with each other. If the level of the directional Signal greater than that of the omnidirectional signal is, an enable signal is generated, with which a phase adjustment is activated in a fitting unit A. Another one Input signal of the adjustment unit A is the level difference between the two estimated levels, with the help of a Subtracter is determined. In the fitting unit A becomes from this a suitable new transit time difference ⁇ T is determined and transmitted to the delay unit D.
- This second method is the Thought that in the event that the level of the differential Directional microphones above the level of the omnidirectional Signal lies, the microphones in individual frequency bands have a runtime difference that is greater than the physically possible sound propagation time between the microphones is determined by the microphone distance. You can therefore The microphone adaptation also achieve that one adaptively the measurable delay of the two microphone signals in individual frequency bands on this physically possible Value limited. At the latest when a signal from the 0 ° direction you can achieve an ideal match.
- a treasure unit SE is first the transit time difference T1 between the output signal x1 of the Microphone M1 and the output signal x2 of the microphone M2 estimated.
- a comparison unit V the estimated Running time T1 with a maximum possible running time T0, the in a memory SP1 is stored compared.
- This maximum Possible running time T0 again corresponds to the sound propagation time between the two microphones.
- Subtractor S is the difference between the estimated runtime T1 and the maximum possible running time T0 under formation a differential transit time T2 determined.
- the comparison unit V If the estimated Running time T1 is greater than the maximum possible running time T0, the comparison unit V outputs an enable signal to a memory SP2 off, which stores the differential transit time T2 that he receives from the subtracter S.
- the stored in the memory SP2 Term T2 is in the delay element D to used to delay the output signal x1.
- the invention thus makes it possible, adaptively, without knowledge of Position of the source (s), the phase of the microphones, in particular in the form of adjustable delays in sufficient compensate for narrow frequency bands.
- This makes it possible "ideal" notches in the directional characteristic at certain To place directions of incidence while ensuring that signals from the desired direction of incidence (e.g., 0 ° direction) will not be attenuated or distorted. requirement this is that once in one for the adaptation sufficiently long period of time a dominant signal from the 0 ° direction is present. The time when this is the case does not need to know the procedure. But the adaptation is completed only after the presence of this signal.
- a particular advantage is that Phase differences caused by effects on the head of a hearing aid wearer arise and the directivity also at massively restrict ideal balanced microphone triplets (especially with differential directional microphones second Okay, where three microphones are used), also can be compensated with the presented methods. Thus, in addition better directional effects when using to expect the directional microphones on the head.
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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)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims (13)
- Verfahren zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons aneinander gekennzeichnet durchMessen oder Vorgeben (PSO) eines ersten Pegels eines omnidirektionalen Signals (y1'(t)) des Richtmikrofons,Messen (PS) eines zweiten Pegels eines Richtsignals (y1 (t)) des Richtmikrofons undAnpassen (A) des zweiten Pegels an den ersten Pegel durch Verändern der Laufzeit eines Ausgangssignals (x2) von einem der Mikrofone (M2) des Richtmikrofons ohne Berücksichtigung einer Positionsinformation über eine Schallquelle.
- Verfahren nach Anspruch 1, wobei das Anpassen (A) durch Bestimmen der Differenz (S) des ersten und des zweiten Pegels und Minimieren dieser Differenz erfolgt.
- Verfahren nach Anspruch 1 oder 2, wobei bei dem Anpassen (A) festgestellt wird, ob der zweite Pegel über dem ersten Pegel liegt, und die Laufzeit des Ausgangssignals von dem einen der Mikrofone (M1, M2) nur dann verändert wird, wenn der zweite Pegel über dem ersten Pegel liegt.
- Vorrichtung zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons aneinander gekennzeichnet durcheine Messeinrichtung (PS, PSO) zum Messen oder Vorgeben eines ersten Pegels eines omnidirektionalen Signals (y1'(t)) des Richtmikrofons und zum Messen eines zweiten Pegels eines Richtsignals (y1(t)) des Richtmikrofons sowieeine Anpasseinrichtung (A) zum Anpassen des zweiten Pegels an den ersten Pegel durch Verändern der Laufzeit eines Ausgangssignals (x2) von einem der Mikrofone (M2) des Richtmikrofons ohne Berücksichtigung einer Positionsinformation über eine Schallquelle.
- Vorrichtung nach Anspruch 4, wobei mit der Anpasseinrichtung (A,S,V) eine Differenz des ersten und des zweiten Pegels bestimmbar und diese Differenz minimierbar ist.
- Vorrichtung nach Anspruch 4 oder 5, wobei mit der Anpasseinrichtung (A,S,V) feststellbar ist, ob der zweite Pegel über dem ersten Pegel liegt und die Laufzeit des Ausgangssignals (x2) von dem einen der Mikrofone (M2) nur dann verändert wird, wenn der zweite Pegel über dem ersten Pegel liegt.
- Verfahren zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons aneinander gekennzeichnet durchVorgeben eines maximalen Laufzeitunterschieds (T0) zwischen einem ersten Ausgangssignal (x1) eines ersten Mikrofons (M1) und einem zweiten Ausgangssignal (x2) eines zweiten Mikrofons (M2) des Richtmikrofons,Messen eines Ist-Laufzeitunterschieds (T1) der beiden Ausgangssignale (x1,x2) undVerzögern (D) eines der beiden Ausgangssignale (x1), so dass der Ist-Laufzeitunterschied (T1) nicht größer als der maximale Laufzeitunterschied (T0) ist.
- Verfahren nach Anspruch 7, wobei der maximale Laufzeitunterschied (T0) der Schalllaufzeit von dem ersten (M1) zu dem zweiten Mikrofon (M2) entspricht.
- Verfahren nach Anspruch 7 oder 8, wobei ein Wert des maximalen Laufzeitunterschieds (T0) in einem Speicher (SP1) bereitgestellt wird.
- Vorrichtung zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons aneinander gekennzeichnet durcheine Bereitstellungseinrichtung (SP1) zum Bereitstellen eines maximalen Laufzeitunterschieds (T0) zwischen einem ersten Ausgangssignal (x1) eines ersten Mikrofons (M1) und einem zweiten Ausgangssignal (x2) eines zweiten Mikrofons (M2) des Richtmikrofons,eine Messeinrichtung (SE) zum Messen oder Schätzen eines Ist-Laufzeitunterschieds (T1) der beiden Ausgangssignale (x1, x2) undeine Verzögerungseinrichtung (D) zum Verzögern eines der beiden Ausgangssignale (x1), so dass der Ist-Laufzeitunterschied (T1) nicht größer als der maximale Laufzeitunterschied (T0) ist.
- Vorrichtung nach Anspruch 10, wobei der maximale Laufzeitunterschied (T0) der Schalllaufzeit von dem ersten (M1) zu dem zweiten Mikrofon (M2) entspricht.
- Vorrichtung nach Ansprüch 10 oder 11, wobei die Bereitstellungseinrichtung (SP1) einen Speicher umfasst.
- Verfahren nach einem der Ansprüche 1 - 3 und 7 - 9, das mehrfach wiederholt wird.
Applications Claiming Priority (2)
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DE102004010867A DE102004010867B3 (de) | 2004-03-05 | 2004-03-05 | Verfahren und Vorrichtung zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons |
DE102004010867 | 2004-03-05 |
Publications (3)
Publication Number | Publication Date |
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EP1571881A2 true EP1571881A2 (de) | 2005-09-07 |
EP1571881A3 EP1571881A3 (de) | 2008-05-28 |
EP1571881B1 EP1571881B1 (de) | 2013-03-27 |
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EP05101246A Active EP1571881B1 (de) | 2004-03-05 | 2005-02-18 | Verfahren und Vorrichtung zum Anpassen der Phasen von Mikrofonen eines Hörgeräterichtmikrofons |
Country Status (7)
Country | Link |
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US (2) | US7587058B2 (de) |
EP (1) | EP1571881B1 (de) |
JP (1) | JP4563218B2 (de) |
CN (1) | CN100584113C (de) |
AU (1) | AU2005200996B2 (de) |
DE (1) | DE102004010867B3 (de) |
DK (1) | DK1571881T3 (de) |
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CN102422652A (zh) * | 2009-04-28 | 2012-04-18 | 松下电器产业株式会社 | 助听装置和助听方法 |
EP2506603A3 (de) * | 2011-03-31 | 2016-04-20 | Sivantos Pte. Ltd. | Hörhilfegerät mit einem Richtmikrofonsystem sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Richtmikrofonsystem |
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EP1773098B1 (de) * | 2005-10-06 | 2012-12-12 | Oticon A/S | Vorrichtung und Verfahren zur Anpassung von Mikrofonen |
CN101321413B (zh) * | 2008-07-04 | 2012-03-28 | 瑞声声学科技(深圳)有限公司 | 电容式麦克风 |
DE102008053070B4 (de) * | 2008-10-24 | 2013-10-10 | Günter Hortmann | Hörgerät |
KR101601197B1 (ko) * | 2009-09-28 | 2016-03-09 | 삼성전자주식회사 | 마이크로폰 어레이의 이득 조정 장치 및 방법 |
US8515109B2 (en) * | 2009-11-19 | 2013-08-20 | Gn Resound A/S | Hearing aid with beamforming capability |
EP2360943B1 (de) | 2009-12-29 | 2013-04-17 | GN Resound A/S | Strahlformung in Hörgeräten |
US8588441B2 (en) | 2010-01-29 | 2013-11-19 | Phonak Ag | Method for adaptively matching microphones of a hearing system as well as a hearing system |
DK2843971T3 (en) * | 2013-09-02 | 2019-02-04 | Oticon As | Hearing aid device with microphone in the ear canal |
US10091579B2 (en) * | 2014-05-29 | 2018-10-02 | Cirrus Logic, Inc. | Microphone mixing for wind noise reduction |
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US10142730B1 (en) * | 2017-09-25 | 2018-11-27 | Cirrus Logic, Inc. | Temporal and spatial detection of acoustic sources |
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DE102019205709B3 (de) * | 2019-04-18 | 2020-07-09 | Sivantos Pte. Ltd. | Verfahren zur direktionalen Signalverarbeitung für ein Hörgerät |
US11070907B2 (en) | 2019-04-25 | 2021-07-20 | Khaled Shami | Signal matching method and device |
US11474970B2 (en) | 2019-09-24 | 2022-10-18 | Meta Platforms Technologies, Llc | Artificial reality system with inter-processor communication (IPC) |
US11487594B1 (en) | 2019-09-24 | 2022-11-01 | Meta Platforms Technologies, Llc | Artificial reality system with inter-processor communication (IPC) |
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US11190892B2 (en) * | 2019-11-20 | 2021-11-30 | Facebook Technologies, Llc | Audio sample phase alignment in an artificial reality system |
DE102020200553B3 (de) * | 2020-01-17 | 2021-05-12 | Sivantos Pte. Ltd. | Verfahren zur Abstimmung der jeweiligen Phasengänge eines ersten Mikrofones und eines zweiten Mikrofons |
WO2022150950A1 (zh) * | 2021-01-12 | 2022-07-21 | 华为技术有限公司 | 评估传声器阵列一致性的方法和装置 |
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-
2005
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- 2005-02-18 EP EP05101246A patent/EP1571881B1/de active Active
- 2005-03-01 JP JP2005055737A patent/JP4563218B2/ja active Active
- 2005-03-02 US US11/070,496 patent/US7587058B2/en active Active
- 2005-03-04 CN CN200510053194A patent/CN100584113C/zh not_active Expired - Fee Related
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CN102422652A (zh) * | 2009-04-28 | 2012-04-18 | 松下电器产业株式会社 | 助听装置和助听方法 |
CN102422652B (zh) * | 2009-04-28 | 2014-07-02 | 松下电器产业株式会社 | 助听装置和助听方法 |
EP2506603A3 (de) * | 2011-03-31 | 2016-04-20 | Sivantos Pte. Ltd. | Hörhilfegerät mit einem Richtmikrofonsystem sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Richtmikrofonsystem |
Also Published As
Publication number | Publication date |
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CN1665350A (zh) | 2005-09-07 |
US7970152B2 (en) | 2011-06-28 |
US20090285423A1 (en) | 2009-11-19 |
JP4563218B2 (ja) | 2010-10-13 |
US7587058B2 (en) | 2009-09-08 |
DK1571881T3 (da) | 2013-07-01 |
DE102004010867B3 (de) | 2005-08-18 |
CN100584113C (zh) | 2010-01-20 |
EP1571881A3 (de) | 2008-05-28 |
EP1571881B1 (de) | 2013-03-27 |
US20050244018A1 (en) | 2005-11-03 |
AU2005200996A1 (en) | 2005-09-22 |
AU2005200996B2 (en) | 2007-05-24 |
JP2005253079A (ja) | 2005-09-15 |
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