EP1102243A2 - Verfahren und Vorrichtung zur Unterdrückung eines Störsignals im Ausgangssignal eines Schallwandlermittels - Google Patents
Verfahren und Vorrichtung zur Unterdrückung eines Störsignals im Ausgangssignal eines Schallwandlermittels Download PDFInfo
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- EP1102243A2 EP1102243A2 EP00125116A EP00125116A EP1102243A2 EP 1102243 A2 EP1102243 A2 EP 1102243A2 EP 00125116 A EP00125116 A EP 00125116A EP 00125116 A EP00125116 A EP 00125116A EP 1102243 A2 EP1102243 A2 EP 1102243A2
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- microphones
- pressure gradient
- pair
- sensitivity
- microphone
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000035945 sensitivity Effects 0.000 claims abstract description 31
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- 230000001629 suppression Effects 0.000 description 4
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
Definitions
- the invention relates to a method for suppressing a Interference signal component in the output signal of a sound transducer means according to Preamble of claim 1 and an associated device for Carrying out this method according to the preamble of claim 9.
- Known methods for suppressing an interference signal component are based on Part on the use of so-called directional microphones. In doing so Sound waves arriving at a certain angle, preferably in electrical signals converted. With so-called interference microphones becomes sound in at least two locations along a microphone tube axis tapped, delayed by acoustic delay elements and then subtracted from each other. Disadvantageous when using Directional microphones are the fixed axial preferred direction, the large design and the negative influence on the directivity when installing the Directional microphones in a surface or interface.
- US 5,610,991 shows a modification of the known Zelinski method, where the merging of the microphone signals of an array to calculate an interference power density by calculating the sum of all cross-power densities. So that the input signals at Interference signals are not too strongly correlated, is a distance between the Microphones necessary that are more than half the wavelength of the Input signals. The calculated interference power density is also depending on the useful or speech signal. For this reason, this must be in in a subsequent step as far as possible.
- DE 42 43 831 A1 shows a method for estimating the running time disturbed voice channels by calculating the cross correlation or Cross-power density.
- a noise reduction through spectral subtraction is only used in the preprocessing of the two input signals used so that an improved phase estimation can take place.
- DE 43 07 688 A1 shows a method for noise reduction for disturbed voice channels, with the preprocessing in each input signal a simple spectral subtraction is performed using a pause detector for estimating the interference reference.
- the preprocessed input signals are added to a constructive one To achieve superposition of the useful signals. This only makes sense if the microphones are relatively far apart and as many as possible Microphones are used. Undesirable forms Side lobes of sensitivity.
- DE 44 45 983 C2 shows a method for noise reduction and a device for performing the method. Doing so Spectral subtraction carried out, the interference reference by a Minimum search within the power density of the input signal is calculated.
- DE 196 50 410 C1 shows a method and a device for disturbance and Echo cancellation.
- the power density of the Differential signal used directly as an interference reference. To do this the microphone distances are large relative to the wavelength of the input signals be selected, at least larger than half the wavelength of the Input signals.
- the directional characteristic of the noise reduction system has strong side lobes, which are disadvantageous because they are too Sound discoloration and falsification of the output signal can.
- the signal analysis can, for example, with filter banks, wavelets or using a fast Fourier transform (FFT).
- FFT fast Fourier transform
- a Wavelet transformation can split the input signal into Frequency groups are eliminated.
- the generated by means of wavelet transformation Sub-signals of the total signal are referred to as The method described according to the invention as a function of the signal-to-noise ratio of the partial signals reduced.
- Wavelet transformations are in Combes, J. M .; Grossman, A .; Tchamitchian, Ph .: Wavelets: Time-Frequency Methods and Phase Space, Berlin, Heidelberg, Springer-Verl. 1989 and in Daubechies, I .: Ten Lectures on Wavelets, SIAM, 1992 described.
- the interference component is estimated by the amount of disturbed input signal is held at times which do not contain a useful signal in the input signal. This estimate is retained as a fault reference until the next useful signal pause. Therefore a current fault reference is not always available. Accordingly, the process cannot change quickly Interference scenarios react.
- the invention is therefore based on the problem of a method and a method Device for suppressing an interference signal component in the output signal to provide a transducer means which has the disadvantages of Overcome the state of the art.
- the method should be a reliable and highly effective suppression of the interference signal component ensure and the directivity in any solid angle can be aligned.
- the associated device is intended in particular in terms of sound transducer means should be compact and should be in one Surface or interface can be installed essentially flush.
- the problem is solved by a method of suppressing one Interference signal component in the output signal of a sound transducer means, which in addition receives the useful signal of a useful signal source from the interference signal Generation of an interference signal reference and spectral subtraction, thereby characterized in that the transducer means a Pressure gradient transducers with a minimum sensitivity, in particular a zero of the sensitivity, for a specifiable Has solid angle and that the sensitivity minimum the useful signal source is aligned.
- the pressure gradient transducer can be a Pressure gradient receiver, an array of pressure gradient receivers consisting of at least two pressure gradient receivers, the Sensitivity minimum each aligned in the direction of the useful signal or through an array of pressure receivers that are closely adjacent are arranged to each other, are provided.
- By subtracting the signals from the two pressure receivers is a Replica pressure gradient receiver.
- a typical example of one Pressure receiver is a microphone with a spherical characteristic, i. H. without Directivity.
- the signal of the pressure gradient sensor in particular by subtracting the preferably equalized microphone signals obtained signal, has a small solid angle range with a Sensitivity minimum, which can be placed so that the useful signal is weakened, in particular completely suppressed becomes.
- a Sensitivity minimum for example an angle with a multiple of 30 °, in particular Include 90 ° or 120 °, and in one area, especially one Surface or boundary surface, which can be flat or curved as desired, the solid angle range can be limited so that only a sensitivity minimum occurs in a single spatial direction. It is possible to share one of the two microphones Assign microphone pairs, so that a total of at least three microphones required are.
- the surface or interface can be, for example, by the dashboard of a motor vehicle be formed. In advantageous The directional characteristic of the pressure gradient sensor also remains the same when the microphones are installed flush in the surface or interface receive.
- the invention Method preferably no statistical power density data for Interference signal suppression used, but determined signals from the Time and / or frequency range.
- the calculated interference reference contains preferably no user signal or voice portion from the outset. For Hiding the useful signal portion becomes a destructive overlay Output signals of the array microphones carried out. It is also advantageous that in the method according to the invention difference signals two very close Adjacent microphones that are in particular less than have half the wavelength of the input signals, or signals from Gradient microphones are used and by adding the Power densities a disturbance reference is formed, which leads to a directivity of the overall system, which is largely independent of the frequency and has no side lobes.
- the pressure gradient sensor delivers a reference signal, in which Interference signals from all spatial directions with the exception of the direction Useful signal source are recorded.
- This reference signal stands for an exact fault reference is available at all times with which the spectral subtraction is performed.
- one of the pressure receivers for conversion composed of the interference signal component and the useful signal component Total signal can be used.
- acoustic Delay of the input signals for phase adjustment as in the Directional microphones are used, there is a delay electronic delay devices, in particular memories. This is the preferred direction of the pressure gradient transducer the processing of the electrical signals adjustable without the The position of the pressure gradient transducer can be changed got to.
- the device according to the invention can be in one surface be integrated and the directivity in any spatial direction be formed. It is also advantageous that the directivity with increasing angular distance from the preferred direction decreases monotonously and in particular has no secondary maxima.
- the output signals can then be recycled or merged separately.
- the method and the device according to the invention are, for example in hands-free systems, hearing aids and room monitoring systems applicable.
- the useful signal can be record each person separately from the other useful signals, if only a device according to the invention in the middle of the table is placed.
- the statistical ones are not Properties of the input signals for the separation of useful and Interference signal components, but the direction of incidence on the Incoming pressure fronts incoming wave fronts.
- a directed interference signal can also be suppressed, if the direction of incidence of the interference signal is different from that of the useful signal differs.
- a multi-channel method is used for spectral subtraction, since single-channel processes do not respond to rapidly changing interference scenarios can react.
- merging the signals of the Pressure gradient transducer are the squares of the amounts in the Frequency domain transformed signals are added, for example, at the merging of the signals from microphones first the differences of the signals of the Microphone pairs calculated and then the amount squares of the Differences added. This creates a directivity of the Overall arrangement in the direction of the useful signal source Minimum sensitivity, in particular a zero, and deviating from this preferably a monotonically increasing Has sensitivity.
- Fig. 1 shows a perspective view of an inventive Pressure gradient transducer 1 with a first pair of microphones with two microphones 2, 4 arranged at a distance from one another second pair of microphones with two spaced apart Microphones 2, 6, one microphone 2 common to the first and second Microphone pair is used. All are in the illustrated embodiment Microphones 2, 4, 6 in one of the connecting line 3 of the first Microphone pairs 2, 4 and the connecting line 5 of the second microphone pair 2, 6 spanned flat surface. Close the connecting lines 3, 5 an angle 7 of, for example, 90 °. The microphones 2, 4, 6 are located flush in the plane spanned by the connecting lines 3, 5.
- the distance 8 between the microphones 2, 4 of the first pair of microphones is correct illustrated embodiment with the distance 9 of the microphones 2, 6 of the second pair of microphones.
- the distances 8, 9 are smaller than half the wavelength of the maximum frequency to be recorded. Otherwise, a generally undesirable frequency-dependent is formed Polar pattern with side lobes. With decreasing intervals 8, 9 are also the difference signals of the first and second microphone pair less.
- Advantageous values for the distances 8, 9 are in the recording of hearing sound in air between 0.1 and 10 cm, in particular between 0.5 and 2.0 cm.
- the array of pressure receivers shown is therefore in able to gradient the incident sound waves in two to each other to determine orthogonal spatial directions (X, Y).
- the connecting line 3 the first pair of microphones determines the Y direction, and determines the connecting line 5 of the second pair of microphones the X direction.
- the microphones 2, 4, 6 are not by delay elements and / or equalizer delay results for the second pair of microphones the microphones 2, 6 the directional characteristic shown in FIG. 3A. Due to the installation of the microphones 2, 4, 6 in a flat interface the directivity is limited to the angular range 0 ⁇ ⁇ ⁇ / 2. In the first pair of microphones with the Microphones 2, 4 the directional characteristic shown in Fig. 3B. By Combination creates the overall directional characteristic of the Pressure gradient transducer with a minimum sensitivity, in particular a zero in which a right with the X and Y axes Angle enclosing the Z axis according to FIG. 3C. The in Fig.
- the overall directional characteristic shown is in particular independent of an interface spanned in the X / Y plane
- Direction of incidence which includes the angle ⁇ with the Y axis, but only depends on the angle ⁇ between an incident direction and the Z axis is included.
- 3C, 4C, 5C and 6C also show that sensitivity increases with increasing Angular distance from the minimum sensitivity increases monotonously. If the distance 8, 9 between the microphones 2, 4, 6 is clearly below the half the minimum wavelength of the sound waves to be processed, for example by a factor of 0.2, this leads to a large extent Independent of the directivity from the frequency.
- the preferably equalized signal 14 of the second microphone 4 of the first Microphone pair minus the signal 12 of the first microphone 2 is formed.
- the difference 15 is preferably equalized Signal 16 of the second microphone 6 of the second pair of microphones and the Signal 12 of the first microphone 2 is formed.
- the magnitude squares 13 ', 15' of the spectra are formed and added to the sum signal 17.
- the equalization of the signals with respect to their phase response aligned with each other It is possible to focus on equalization to do without at most one of the signals.
- the signal 12 not equalized.
- it can also be the signal 14 or the signal 16 not used equalized. Should the frequency response of the microphones or the room acoustics can also be compensated for, so are everyone Equalize input signals.
- a frequency response correction by multiplying by the Square of a filter vector 19, which is a function of Speed of sound, the microphone distance, the sampling frequency and the Frequency index. Due to the multiplication, the interference reference 21 independent of frequency.
- the filter vector creates depths Frequencies raised more than high frequencies. Through a Upstream integrator or RC low pass can use the microphone signals be pre-equalized. This is then too when choosing the filter vector take into account the frequency dependence of the difference signals 13, 15 and this results in particular when using analog / digital converters caused with low bit resolution Quantization noise in the lower frequencies, to reduce or even to eliminate.
- the useful signal 22 is determined by the spectral subtraction 20.
- the equalization of the microphone signals is particularly important when using Microphones of the lower quality class are recommended as they are in the Usually have large tolerances in the amplitude and phase response. Also in case of unsatisfactory room acoustics or acoustically unfavorable position of the Equalization can be beneficial to microphones.
- the equalizer and / or is a preferably adjustable delay element the sensitivity minimum of the pressure gradient transducer the position of the useful signal source can be aligned without the spatial position the microphones must be changed.
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- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Quality & Reliability (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Computational Linguistics (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Circuit For Audible Band Transducer (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
- Fig. 1
- zeigt in perspektivischer Ansicht einen erfindungsgemäßen Druckgradientenaufnehmer,
- Fig. 2
- zeigt ein Abarbeitungsschema für das erfindungsgemäße Verfahren, und
- Fig. 3A bis 6C
- zeigen die Richtcharakteristik des Druckgradientenaufnehmers für vier verschiedene Ausrichtungen des Empfindlichkeitsminimums.
Claims (18)
- Verfahren zur Unterdrückung eines Störsignalanteils im Ausgangssignal eines Schallwandlermittels, das neben dem Störsignal ein Nutzsignal einer Nutzsignalquelle empfängt, durch Generierung einer Störsignalreferenz (21) und Spektralsubtraktion (20), dadurch gekennzeichnet, daß das Schallwandlermittel einen Druckgradientenaufnehmer (1) mit einem Empfindlichkeitsminimum für einen vorgebbaren Raumwinkel aufweist, daß das Empfindlichkeitsminimum auf die Nutzsignalquelle ausgerichtet wird und daß die Störsignalreferenz (21) aus einem Ausgangssignal des Druckgradientenaufnehmers (1) generiert wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Empfindlichkeitsminimum eine Nullstelle der Empfindlichkeit ist.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Druckgradientenaufnehmer (1) ein erstes Mikrofonpaar mit zwei voneinander beabstandet angeordneten ersten Mikrofonen (2, 4) aufweist, und der Druckgradient in Richtung einer Verbindungslinie (3) des ersten Mikrofonpaares durch Subtraktion der vorzugsweise entzerrten Ausgangssignale der beiden Mikrofone (2, 4) gebildet wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Druckgradientenaufnehmer (1) ein zweites Mikrofonpaar mit zwei voneinander beabstandet angeordneten zweiten Mikrofonen (2, 6) aufweist, wobei eine Verbindungslinie (5) des zweiten Mikrofonpaares die Verbindungslinie (3) des ersten Mikrofonpaares schneidet, insbesondere die Verbindungslinien (3, 5) einen rechten Winkel (7) einschließen.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß ein Mikrofon (2) gemeinsam für das erste und das zweite Mikrofonpaar eingesetzt wird und daß alle Mikrofone (2, 4, 6) in einer Fläche, insbesondere einer Grenzfläche, liegen.
- Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Betragsquadrate (13', 15') der in den Frequenzbereich transformierten Ausgangssignale der beiden Mikrofonpaare addiert werden.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Ausrichtung des Empfindlichkeitsminimums bei unveränderter Stellung des Druckgradientenaufnehmers durch vorzugsweise elektrische Laufzeitglieder und/oder Entzerrmittel erfolgt.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß ausgehend vom Empfindlichkeitsminimum mit zunehmendem Abstand vom Raumwinkel die Empfindlichkeit des Druckgradientenaufnehmers (1) monoton ansteigt.
- Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß für die Spektralsubtraktion (20) ein mehrkanaliges Verfahren eingesetzt wird.
- Vorrichtung zur Unterdrückung eines Störsignalanteils im Ausgangssignal eines Schallwandlermittels, mit dem neben dem Störsignal ein Nutzsignal einer Nutzsignalquelle empfangbar ist, mit Mitteln zur Generierung einer Störsignalreferenz (21) und Mitteln zur Spektralsubtraktion (20), dadurch gekennzeichnet, daß das Schallwandlermittel einen Druckgradientenaufnehmer (1) mit einem Empfindlichkeitsminimum, insbesondere einer Nullstelle der Empfindlichkeit, für einen vorgebbaren Raumwinkel aufweist, daß das Empfindlichkeitsminimum auf die Nutzsignalquelle ausrichtbar ist und daß die Störsignalreferenz (21) aus einem Ausgangssignal des Druckgradientenaufnehmers (1) generierbar ist.
- Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß der Druckgradientenaufnehmer (1) ein erstes Mikrofonpaar mit zwei voneinander beabstandet angeordneten ersten Mikrofonen (2, 4) aufweist, und der Druckgradient in Richtung einer Verbindungslinie (3) des ersten Mikrofonpaares durch Subtraktion der vorzugsweise entzerrten Ausgangssignale der beiden Mikrofone (2, 4) bildbar ist.
- Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß der Druckgradientenaufnehmer (1) ein zweites Mikrofonpaar mit zwei voneinander beabstandet angeordneten zweiten Mikrofonen (2, 6) aufweist, wobei eine Verbindungslinie (5) des zweiten Mikrofonpaares die Verbindungslinie (3) des ersten Mikrofonpaares schneidet, insbesondere die Verbindungslinien (3, 5) einen rechten Winkel (7) einschließen.
- Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß ein Mikrofon (2) gemeinsam für das erste und das zweite Mikrofonpaar einsetzbar ist und daß alle Mikrofone (2, 4, 6) in einer Ebene liegen.
- Vorrichtung nach Anspruch 12 oder 13, dadurch gekennzeichnet, daß der Druckgradientenaufnehmer (1) Mittel zum Addieren der Betragsquadrate der in den Frequenzbereich transformierten Ausgangssignale der beiden Mikrofonpaare aufweist.
- Vorrichtung nach einem der Ansprüche 11 bis 14, dadurch gekennzeichnet, daß der Abstand (8, 9) zwischen den Mikrofonen des ersten und zweiten Mikrofonpaares kleiner als die halbe Wellenlänge der höchsten auftretenden Frequenz in den erfaßbaren Stör- und Nutzsignalen ist, und vorzugsweise bei Hörschall in Luft zwischen 0,1 und 10 cm, insbesondere zwischen 0,5 und 2,0 cm, beträgt.
- Vorrichtung nach einem der Ansprüche 11 bis 15, dadurch gekennzeichnet, daß die Mikrofone (2, 4, 6) im wesentlichen bündig mit einer sie umgebenden Fläche, insbesondere einer Grenz- oder Oberfläche, abschließen.
- Vorrichtung nach einem der Ansprüche 11 bis 16, dadurch gekennzeichnet, daß das Empfindlichkeitsminimum bei unveränderter Stellung des Druckgradientenaufnehmers (1) durch vorzugsweise elektrische Laufzeitglieder und/oder Entzerrmittel ausrichtbar ist.
- Vorrichtung nach einem der Ansprüche 11 bis 17, dadurch gekennzeichnet, daß durch die Mittel für die Spektralsubtraktion (20) ein mehrkanaliges Verfahren zur Spektralsubtraktion (20) einsetzbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999155156 DE19955156A1 (de) | 1999-11-17 | 1999-11-17 | Verfahren und Vorrichtung zur Unterdrückung eines Störsignalanteils im Ausgangssignal eines Schallwandlermittels |
DE19955156 | 1999-11-17 |
Publications (2)
Publication Number | Publication Date |
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EP1102243A2 true EP1102243A2 (de) | 2001-05-23 |
EP1102243A3 EP1102243A3 (de) | 2001-11-07 |
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EP00125116A Withdrawn EP1102243A3 (de) | 1999-11-17 | 2000-11-17 | Verfahren und Vorrichtung zur Unterdrückung eines Störsignals im Ausgangssignal eines Schallwandlermittels |
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EP (1) | EP1102243A3 (de) |
DE (1) | DE19955156A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006027707A1 (en) * | 2004-09-07 | 2006-03-16 | Koninklijke Philips Electronics N.V. | Telephony device with improved noise suppression |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10310580A1 (de) | 2003-03-11 | 2004-10-07 | Siemens Audiologische Technik Gmbh | Vorrichtung und Verfahren zur Adaption von Hörgerätemikrofonen |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5610991A (en) * | 1993-12-06 | 1997-03-11 | U.S. Philips Corporation | Noise reduction system and device, and a mobile radio station |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4243831A1 (de) * | 1992-12-23 | 1994-06-30 | Daimler Benz Ag | Verfahren zur Laufzeitschätzung an gestörten Sprachkanälen |
DE4307688A1 (de) * | 1993-03-11 | 1994-09-15 | Daimler Benz Ag | Verfahren zur Geräuschreduktion für gestörte Sprachkanäle |
DE4445983C2 (de) * | 1994-12-22 | 1998-10-15 | Becker Gmbh | Verfahren zur Rauschunterdrückung und Vorrichtungen zur Durchführung der Verfahren |
DE19650410C1 (de) * | 1996-12-05 | 1998-05-07 | Deutsche Telekom Ag | Verfahren und Vorrichtung zur Stör- und Echounterdrückung |
-
1999
- 1999-11-17 DE DE1999155156 patent/DE19955156A1/de not_active Withdrawn
-
2000
- 2000-11-17 EP EP00125116A patent/EP1102243A3/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5610991A (en) * | 1993-12-06 | 1997-03-11 | U.S. Philips Corporation | Noise reduction system and device, and a mobile radio station |
Non-Patent Citations (1)
Title |
---|
ELKO G W: "Microphone array systems for hands-free telecommunication" SPEECH COMMUNICATION, ELSEVIER SCIENCE PUBLISHERS, AMSTERDAM, NL, Bd. 20, Nr. 3, 1. Dezember 1996 (1996-12-01), Seiten 229-240, XP004016547 ISSN: 0167-6393 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006027707A1 (en) * | 2004-09-07 | 2006-03-16 | Koninklijke Philips Electronics N.V. | Telephony device with improved noise suppression |
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Publication number | Publication date |
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DE19955156A1 (de) | 2001-06-21 |
EP1102243A3 (de) | 2001-11-07 |
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