EP1269576A1 - Verfahren zur vorgabe der übertragungscharakteristik einer mikrophonanordnung und mikrophonanordnung - Google Patents
Verfahren zur vorgabe der übertragungscharakteristik einer mikrophonanordnung und mikrophonanordnungInfo
- Publication number
- EP1269576A1 EP1269576A1 EP00912317A EP00912317A EP1269576A1 EP 1269576 A1 EP1269576 A1 EP 1269576A1 EP 00912317 A EP00912317 A EP 00912317A EP 00912317 A EP00912317 A EP 00912317A EP 1269576 A1 EP1269576 A1 EP 1269576A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- output
- value
- microphone arrangement
- input
- submicrophone
- 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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
-
- 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 method according to the preamble of claim 1 and a microphone arrangement according to that of claim 9.
- microphone arrangements with a transmission characteristic which, in a predetermined or predefinable function of the direction of incidence of the acoustic signals, generate the electrical output signal.
- microphone arrangements with predetermined or predeterminable directional characteristics, in which acoustic signals from predetermined directional areas have a greater effect on the output signal from other directional areas, up to arrangements with reception characteristics that are practically focused in one direction.
- this object is achieved by a method of the type mentioned in the introduction, in which at least two submicrophone arrangements are provided on the microphone arrangement,
- a saturation of the mentioned product i.e. of the weighted quotient, to a minimum value may be sensible, it is preferably proposed that the product, in any case also, be saturated to a maximum value.
- the second factor of the saturated product can have any value other than zero, which means that it can also have the value 1.
- the function mentioned comprises a difference between an optionally adjustable constant and the saturated product, the value of the constant preferably being selected to be at least approximately equal to the saturation value.
- the quotient mentioned is preferably determined from the amplitude values of the output signals, without taking their phase position into account.
- the quotient mentioned is used in the context of the following function:
- c N amplitude value of the output signal of a first submicrophone arrangement, the transmission characteristics of which have maximum amplification at an angle of incidence, where the characteristic to be formed should also have maximum amplification
- satB Saturation of the quotient to a predetermined or predeterminable maximum signal value
- ⁇ Predeterminable or predefined factor.
- the transmission characteristics of the submicrophone arrangements are selected such that they each have maximum signal amplifications for acoustic signals incident from essentially inverse directions.
- a microphone arrangement of the type mentioned at the outset is characterized in that the processing unit comprises a weighted quotient formation unit with a Denominator input, a numerator input and a weighting input, numerator and denominator inputs being operatively connected to an input of the processing unit, the weighted quotient formation unit further producing an output signal saturated to a maximum and / or a minimum value at its output, which Output is operatively connected to the output of the processing unit.
- the method according to the invention and the microphone arrangement according to the invention are particularly suitable for use on hearing aids.
- signal processing in the frequency domain is carried out in a preferred embodiment, using time domain / frequency domain converters or frequency domain / time domain converters.
- FIG. 4 in a representation analogous to FIGS. 1 a and 1 b, shaded, a transmission characteristic implemented according to the invention
- FIG. 5 shows a representation analogous to FIG. 4, a further transmission characteristic implemented according to the invention.
- a first submicrophone arrangement has, with regard to its transmission or amplification characteristic with regard to acoustic signals incident on it from the direction ⁇ , the three-dimensional transmission characteristic shown in FIG. FIG. 1b shows, analogously to FIG. La, the transmission characteristic of a second submicrophone arrangement, which with respect to the axis ⁇ / 2; 3 ⁇ / 2 is a mirror image of the transmission characteristic of the first sub- microphone arrangement.
- the transfer characteristic according to FIG. La is denoted by c N , that according to lb by c z .
- a quotient is now formed from these two output signals, which is likewise denoted by c N or c z , for example
- the quotient function is preferably saturated to a predetermined or predeterminable value B, according to FIG. 1 preferably to the value "one", with the maximum value of the transfer functions according to FIGS. 1 a, b being "one".
- the denominator transmission characteristic in the present case c N , is that which is the dominant one for the transmission characteristic result to be achieved, that is to say a transmission characteristic which has a high signal gain in an angular range, in which also the realizing desired characteristics high signal Should have strengthening, the advantage of forming the quotient according to the invention is already evident. From this transmission characteristic, which is dominant for the desired result, a pole point of the quotient results in the zero angle range. However, the zero point angle range of the dominant transmission characteristic or those angle ranges with reduced signal amplification will be those which are to be changed, ie “improved”, in order to obtain the desired characteristic. There is the possibility to intervene simply, namely by saturation a predeterminable or predefined constant value of the quotient function.
- the range of the quotient function set according to the invention to the specified saturation value is used to achieve a defined minimum gain of the desired transmission characteristic there, ie in this angular range
- this is achieved in that the saturated quotient function is subtracted from a predetermined or predeterminable fixed value A, for example and preferably in the example presented with the value “one”. This results in the function shown again in solid form in FIG. 3
- the transmission characteristic to be implemented is implemented on the output side of the microphone arrangement according to the invention as a function of the quotient of the output signals of two submicrophone arrangements with different transmission characteristics, which is saturated to a predetermined or predeterminable maximum value.
- the quotient function Q is multiplied by a further predetermined or adjustable weighting factor before the resulting product saturates.
- the weighting factor mentioned is 1.
- sub-microphone arrangements are preferably used whose transmission characteristics are identical, but are inversely directed with respect to the direction of incidence of acoustic signals.
- the inverse-acting microphone arrangements just mentioned can in particular also be implemented in this embodiment with two microphones, the outputs of which, as will be shown below, are each time-delayed and appropriately added to form the two sub-microphone arrangements. • It goes without saying that further development of the procedure according to the invention with three or more submicrophone arrangements makes it possible to implement highly complex transfer functions and transfer function combinations.
- FIG. 6 shows, for example, a microphone arrangement operating according to the method according to the invention on the basis of a simplified signal flow / function block diagram, in particular also for use on a hearing aid.
- an arrangement 1 with at least two sub-microphone arrangements 1 a and 1 b is provided on the input side of the microphone arrangement according to the invention.
- output signals appear as a function of the direction ⁇ of acoustic impinging on the input-side microphones Signals.
- the two Submikrophonan isten may well be realized by means of a single pair of microphones whose outputs are coupled to one another according to the technique "delay and add" It is essential that b basically signals at the outputs A ia and A ⁇ with. Different transmission characteristics with respect to the direction ⁇ incoming acoustic signals are generated.
- the outputs A ia and A lb are preferably routed to the time range / frequency range converter units FFT 3a and 3b, if, as preferred, the subsequent signal processing in the frequency range is to take place.
- the outputs mentioned are operatively connected to inputs E 5a and E 5b of amount formation units 5a and 5b.
- the outputs of the aforementioned amount formation units are routed to the denominator and numerator inputs N and Z of a division unit 7. Multiplied by a weighting unit 9 by a weighting factor ⁇ which can be predetermined at a control input S 9 , the output A 7 is operatively connected to the one input E ila of a subtraction unit 11.
- division unit 7 and weighting unit 9 form a weighted quotient formation unit 10.
- the factor ⁇ that can be set on the weighting unit 9, for example, shown in FIG. 6, can have any values that differ from 0.
- the signal at the output A 9 of the weighted quotient formation unit 10 is fed to a saturation unit 12, the output of which is only fed to the input E 11a .
- the saturation unit 12 which can of course be integrated integrally with the weighted quotient formation unit 10, the output signal of the weighted quotient formation unit 10 is down (in
- the signal present there is subtracted from a fixed value A set or adjustable at the second input E11b .
- the output A X1 of the subtraction unit 11 is operatively connected to the one input E i3a of a multiplication unit 13, with the second input E ⁇ 3b of which the output signal of the submicrophone arrangement la which is also operatively connected to the denominator input N of the division unit 7 is operatively connected.
- the denominator signal optionally also the numerator signal, can be fed to the input N or the input Z of the division input 7, as shown in dashed lines at 15.
- the output signal S 0 ut of the microphone arrangement according to the invention appears on the output side of the multiplication unit 13. It has the desired transmission characteristic as a function of the spatial angle ⁇ with which acoustic signals strike the microphone arrangement 1 on the input side.
- Transmission characteristics of the submicrophone arrangements la and lb selected identical, directionally inverse characteristics.
- the desired transmission characteristic is set on the output signal S ou t.
- the method according to the invention and the microphone arrangement according to the invention are excellently suited for use on hearing aids, in particular also because of the low signal processing effort and, as was shown with reference to FIGS. 3 and 4, the possibility of signal transmission from undesired directions of incidence, such as from behind in terms of of a worn hearing aid to suppress.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CH2000/000190 WO2000033634A2 (de) | 2000-03-31 | 2000-03-31 | Verfahren zur vorgabe der übertragungscharakteristik einer mikrophonanordnung und mikrophonanordnung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1269576A1 true EP1269576A1 (de) | 2003-01-02 |
EP1269576B1 EP1269576B1 (de) | 2005-03-09 |
Family
ID=4358061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00912317A Expired - Lifetime EP1269576B1 (de) | 2000-03-31 | 2000-03-31 | Verfahren zur vorgabe der übertragungscharakteristik einer mikrophonanordnung und mikrophonanordnung |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1269576B1 (de) |
JP (1) | JP2003516646A (de) |
AU (2) | AU3414200A (de) |
CA (1) | CA2404863C (de) |
DE (1) | DE50009746D1 (de) |
DK (1) | DK1269576T3 (de) |
WO (1) | WO2000033634A2 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6687187B2 (en) | 2000-08-11 | 2004-02-03 | Phonak Ag | Method for directional location and locating system |
US6449216B1 (en) | 2000-08-11 | 2002-09-10 | Phonak Ag | Method for directional location and locating system |
US7274794B1 (en) | 2001-08-10 | 2007-09-25 | Sonic Innovations, Inc. | Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment |
US7076072B2 (en) * | 2003-04-09 | 2006-07-11 | Board Of Trustees For The University Of Illinois | Systems and methods for interference-suppression with directional sensing patterns |
US7324651B2 (en) | 2004-03-15 | 2008-01-29 | Phonak Ag | Feedback suppression |
EP1469702B1 (de) * | 2004-03-15 | 2016-11-23 | Sonova AG | Rückkopplungsunterdrückung |
EP2036396B1 (de) * | 2006-06-23 | 2009-12-02 | GN ReSound A/S | Hörinstrument mit adaptiver richtsignalverarbeitung |
WO2008061534A1 (en) | 2006-11-24 | 2008-05-29 | Rasmussen Digital Aps | Signal processing using spatial filter |
WO2010146857A1 (ja) * | 2009-06-17 | 2010-12-23 | パナソニック株式会社 | 補聴装置 |
WO2011107545A2 (de) * | 2010-03-05 | 2011-09-09 | Siemens Medical Instruments Pte. Ltd. | Verfahren zum einstellen einer hörvorrichtung mit richtwirkung |
EP2699020B1 (de) * | 2012-08-17 | 2016-04-13 | Sivantos Pte. Ltd. | Verfahren und Vorrichtung zum Bestimmen eines Verstärkungsfaktors eines Hörhilfegeräts |
DE102013201043B4 (de) | 2012-08-17 | 2016-03-17 | Sivantos Pte. Ltd. | Verfahren und Vorrichtung zum Bestimmen eines Verstärkungsfaktors eines Hörhilfegeräts |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2242790B2 (de) * | 1972-08-31 | 1976-10-21 | Hißen, Helmut, Dr.-Ing., 5481 Nierendorf; Kosel, Georg, Dr.-Ing., 5483 Bad Neuenahr; Krätzig, Gudrun, 5300 Bonn-Bad Godesberg | Digitaler peilempfaenger mit spektrumsauswertung |
DE3017797A1 (de) * | 1980-05-09 | 1981-11-12 | Fried. Krupp Gmbh, 4300 Essen | Verfahren zum bestimmen der einfallsrichtungen |
US4752961A (en) * | 1985-09-23 | 1988-06-21 | Northern Telecom Limited | Microphone arrangement |
US5289544A (en) * | 1991-12-31 | 1994-02-22 | Audiological Engineering Corporation | Method and apparatus for reducing background noise in communication systems and for enhancing binaural hearing systems for the hearing impaired |
US5473701A (en) * | 1993-11-05 | 1995-12-05 | At&T Corp. | Adaptive microphone array |
DE19730878B4 (de) * | 1996-07-20 | 2004-07-08 | Technische Universität Dresden | Anordnung zur objektiven Beurteilung des Funktionszustandes des menschlichen Hörorgans |
-
2000
- 2000-03-31 AU AU3414200A patent/AU3414200A/xx active Pending
- 2000-03-31 DE DE50009746T patent/DE50009746D1/de not_active Expired - Lifetime
- 2000-03-31 EP EP00912317A patent/EP1269576B1/de not_active Expired - Lifetime
- 2000-03-31 AU AU2000234142A patent/AU2000234142B2/en not_active Ceased
- 2000-03-31 JP JP2000586153A patent/JP2003516646A/ja active Pending
- 2000-03-31 WO PCT/CH2000/000190 patent/WO2000033634A2/de active IP Right Grant
- 2000-03-31 DK DK00912317T patent/DK1269576T3/da active
- 2000-03-31 CA CA002404863A patent/CA2404863C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0033634A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000033634A3 (de) | 2001-05-17 |
JP2003516646A (ja) | 2003-05-13 |
AU3414200A (en) | 2000-06-26 |
DE50009746D1 (de) | 2005-04-14 |
DK1269576T3 (da) | 2005-05-17 |
EP1269576B1 (de) | 2005-03-09 |
AU2000234142B2 (en) | 2005-05-19 |
WO2000033634A2 (de) | 2000-06-15 |
CA2404863C (en) | 2009-08-04 |
CA2404863A1 (en) | 2002-09-24 |
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