WO1995034983A1 - Adaptive microphone arrangement and method for adapting to an incoming target-noise signal - Google Patents
Adaptive microphone arrangement and method for adapting to an incoming target-noise signal Download PDFInfo
- Publication number
- WO1995034983A1 WO1995034983A1 PCT/SE1995/000718 SE9500718W WO9534983A1 WO 1995034983 A1 WO1995034983 A1 WO 1995034983A1 SE 9500718 W SE9500718 W SE 9500718W WO 9534983 A1 WO9534983 A1 WO 9534983A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- calibration
- noise
- arrangement according
- beamformer
- Prior art date
Links
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims description 11
- 238000001914 filtration Methods 0.000 claims abstract description 29
- 238000003860 storage Methods 0.000 claims description 17
- 230000006978 adaptation Effects 0.000 claims description 13
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/26—Sound-focusing or directing, e.g. scanning
- G10K11/34—Sound-focusing or directing, e.g. scanning using electrical steering of transducer arrays, e.g. beam steering
- G10K11/341—Circuits therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H21/00—Adaptive networks
- H03H21/0012—Digital adaptive filters
-
- 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
-
- 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
- G10L2021/02166—Microphone arrays; Beamforming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
- H04R2201/403—Linear arrays of transducers
Definitions
- the present invention relates to an adaptive microphone ar ⁇ rangement as referred to in the first part of claim 1.
- the invention furthermore relates to a method for adapting to an incoming target signal.
- the conditions under which a microphone arrangement is to be used vary to a great extent. Sometimes the environment is very noisy, as for example in a car or any moving vehicle or simi ⁇ lar, moreover also in workshops, storehouses etc. When so called hands-free operation is applied, the requirements on the microphone arrangement is even more demanding among others due to the distance from the source of the speech or whatever it may, be to the microphones. E.g. the noisy environment in a car severely degrades the performance of so called hands free mobile telephones and speech recognition devices.
- a further object of the invention is to provide a method for adapting to an incoming target signal.
- the signal forming arrangement comprises an adaptive beamformer and a filtering beamformer.
- the calibration signal is a speech signal or even more particularly a typical speech signal or a signal with a speech influenced spectrum.
- the calibration signal is recorded on site, i.e. it is recorded using the same equipment and in an ad ⁇ vantageous embodiment at the same location as when the target target-noise signal is produced.
- the storage com ⁇ prises a digital storage, or even more particularly one digital storage for each input calibration signal, each for a separate microphone.
- the calibration signal may comprise a number of (secondary) calibration signals, i.e. calibration signals from each microphone which are combined into a so called desired signal.
- the adapting means uses an adaptive al ⁇ gorithm which e.g. may be the so called LMS (Least Mean Square) algorithm or some other algorithm, for example the RLS (Recu ⁇ rsive Least Square) or any other appropriate algorithm. Par- ticularly either one of the calibration signals or a combina ⁇ tion of two or more thereof often is used as a so called desired signal in the algorithm means with which the sum of the calibration signal and the noise signal is compared in a manner known per se.
- LMS Least Mean Square
- RLS Recu ⁇ rsive Least Square
- the adaptive beamformer During adaptation, during which no target signal or no speech is provided, a number of filtering coefficients are obtained in the adaptive beamformer in a manner known per se. The filtering coefficients are copied to and used in the second beamformer or the filtering beamformer.
- a target (target-noise) signal When a target (target-noise) signal is input, or a speaker or similar is active, the adaptation of the adaptive beamformer is switched off and no adaptation takes place. Then the target signal or e.g. the speech signal is filtered through the filtering beamformer.
- the first and second beamformers comprise filters such as e.g. FIR-filters (Finite Impulse Response), the adaptation coefficients thereof being optimized adaptively to the actual noise level or noise situation and to the equipment "on site".
- Fig. 1 illustrates a calibration phase
- Fig. 2 illustrates an adaptive filtering phase.
- an array of microphones is arranged for example in a car.
- an array comprising n microphones (MP X , MP 2 ,..., MP n ) is illustrated wherein n can be any number from one upwards and is chosen depending on the actual circumstances and the relev ⁇ ant environment. Thus there may be either one or more micro ⁇ phones.
- 8 microphone are used but this of course merely constitutes an example.
- the microphones may be of any appropriate quality or of any kind. If however they are of a standard quality, they generally have a con- siderable spread in performance which in turn poses high demands on the beamformer as to easily incorporate a calibra ⁇ tion step.
- training sequences are recorded from different positions in the environment of e.g. a true speaker position in a real situation with the actual system and with no noise present.
- the training sequences or the calibration signals are then gathered into a storage and later used as so called training signals in the adaptive phase. Therethrough an inherent calibration signal is obtained and it is generally possible to wheigh interesting frequency bands and spatial points.
- the arrangement according to the invention is accurate for the actual situation and it does not depend on the geometry of the array of microphones or similarities between elements or on calibration or matching of amplifiers or other electronic equipment etc.
- the microphone arrangement generally uses two sets of input data, namely the target-noise signals in a filtering beamformer and the recorded calibrations signals plus the noise signals in the adaptive beamformer.
- the signals are filtered with so called FIR-filters or Finite Impulse Response filters or a so called tapped delay line, which carries out a linear combination of input data.
- the microphone arrangement may particularly be used for so called hands free operation.
- the microphone arrangement according to Fig. 1 comprises a number of microphones MP j , MP 2 , ..., MP n wherein the micropho ⁇ nes are arranged and placed in any desired manner.
- the input calibration signals M l r ..., M n undergo, an anti - aliasing operation and an A/D conversion in a conversion block 1 where ⁇ after the signals, now designated m l r m 2 , ..., m n are recorded in a calibration signal storage 2.
- the calibration signals m l f ... , m n are also used in the adaptive means as will be further described later on.
- the calibration signal is to be provided as a pure calibration signal, i.e.
- a typical speech signal or signal with a speech influenced spectrum, from the typical speaker position is recorded in the calibration signal storage 2.
- This is preferab ⁇ ly a digital storage or more particularly a number of digital storages, each for one microphone channel.
- These recorded signals form calibration signals l r ..., ⁇ L,.
- the adaptive means or the adaptive beamformer 4 can advantageously be calibrated on-site in a car or similar e.g. by using either a loudspeaker or letting the speaker read a representative sequence. The sequences received in each microphone channel are gathered into the calibration signal storage 2.
- the channels from the speaker or the loudspeaker or similar to A/D converters are included.
- the environmental noise level should be as low as possible in order to obtain a good signal-to-noise ratio in a desired signal which may be either one of the input calibration signals m l r ... , m nl , or a combination of two or more of the calibration signals m x , m 2 , .... , ⁇ ,.
- the situa ⁇ tion as well as the equipment is generally time-invariant wherethrough the microphone arrangement has been provided with calibration signals which can be combined to form the desired signals as referred to above.
- the separate microphones MP X , MP 2 , ..., MP n and their placement can be chosen in any appropriate manner.
- the speaker position or the loudspeaker position is changed in such way that it is moved around and in the vicinity of the speakers normal position during the recording of the calibration signal into the storage.
- the recorded calibration signals from different positions are according to a preferred embodiment superimposed to provide weighted average training signals or calibration signals or reference signals. As already referred to above, these signals are gathered into the storage- 2. As can be seen from Fig.
- those signals, m,, m 2 , m n and m r which forms so called calibration signals, or reference sig ⁇ nals, are then used as well as training signals as, e.g. in a combined form, as a desired signal or reference signal for use during adaptation.
- an adaptive phase follows. During this phase there is no calibration input signal.
- the situation is very generally a noisy situation, in the case of the car it may relate to a situation wherein the speaker is silent and wherein the car is moving, i.e. the motor is running etc.
- the input signals to the adapting beamformer 4 are formed by the sum of the in the storage 2 stored calibra ⁇ tion signals m l r m 2 , ...,11 ⁇ and the noise signals H l r N 2 , ..., N n respectively.
- the storage also comprises an arrangement (not shown) wherein e.g. a combined desired signal m r is formed.
- a known reference signal or a desired signal m r which has passed through the same electronic equipment when no noise was present is also obtained.
- the adaptive filters of the adapting beamformer 4 therethrough are provided with all the information that is needed to adapt to the correct filter coefficients e.g. in the least square sense or applying the LMS-algorithm (or any other appropriate algorithm).
- the adaptive microphone arrangement will be calibrated "on site” to the prevailing acoustic enviro ⁇ nment and to the placement of the microphones etc. as well as to the individual properties of the microphones, amplifiers, A/D - converters and so on.
- the coefficients of the digital filters of the adaptive beamformer 4 has been optimized adaptively to the current noise situation and to the actual equipment, these are copied to the second beamformer or the filtering beamformer 5.
- the filtering beamformer 5 operates when the speaker or similar is active.
- the adaptation is switched off, either automatically or manually e.g. by a "push- to-talk"-function. This relates to a preferred embodiment; it is however not necessary. If the adaptation is switched off, however, this is done to avoid echo-effects and/or to provide a more robust system so that the adaptive filters cannot operate on the real speech signal.
- the target signal or the speech signal comprising speech plus noise, sn 1( sn 2 , ..., sn 3 is merely filtered through the filtering beamformer 5.
- the filtering coefficients are fixed and the output signal is obtained from the filtering beamformer 5.
- the filtering beamformer preferably works continuously and without any calibration signal.
- the different components of the microphone arrangement can be of any desired kind. A number of different known microphone types can be used. Different filters can also be used of which so called FIR-fliters merely constitute one example. Also the storage can be chosen in any appropriate way. The sampling frequency may likewise take a number of different values. The invention may also in a number of other aspect be varied in a number of different ways merely being limited by the scope of the claims.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Computational Linguistics (AREA)
- Quality & Reliability (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
- Filters That Use Time-Delay Elements (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU27594/95A AU2759495A (en) | 1994-06-14 | 1995-06-13 | Adaptive microphone arrangement and method for adapting to an incoming target-noise signal |
EP95922851A EP0765562A1 (en) | 1994-06-14 | 1995-06-13 | Adaptive microphone arrangement and method for adapting to an incoming target-noise signal |
JP8502045A JPH10501668A (en) | 1994-06-14 | 1995-06-13 | Adaptive microphone device and incoming target noise signal adaptation method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9402088-0 | 1994-06-14 | ||
SE9402088A SE502888C2 (en) | 1994-06-14 | 1994-06-14 | Adaptive microphone device and method for adapting to an incoming target noise signal |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995034983A1 true WO1995034983A1 (en) | 1995-12-21 |
Family
ID=20394386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1995/000718 WO1995034983A1 (en) | 1994-06-14 | 1995-06-13 | Adaptive microphone arrangement and method for adapting to an incoming target-noise signal |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0765562A1 (en) |
JP (1) | JPH10501668A (en) |
AU (1) | AU2759495A (en) |
SE (1) | SE502888C2 (en) |
WO (1) | WO1995034983A1 (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0883325A2 (en) * | 1997-06-02 | 1998-12-09 | The University Of Melbourne | Multi-strategy array processor |
WO1999003091A1 (en) * | 1997-07-11 | 1999-01-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for measuring signal level and delay at multiple sensors |
DE19801389A1 (en) * | 1998-01-16 | 1999-07-22 | Cit Alcatel | Echo cancellation method with adaptive FIR filters |
WO1999039497A1 (en) * | 1998-01-30 | 1999-08-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Generating calibration signals for an adaptive beamformer |
WO1999049698A1 (en) * | 1998-03-23 | 1999-09-30 | Volkswagen Aktiengesellschaft | Method and device for operating a microphone system, especially in a motor vehicle |
EP1057291A1 (en) * | 1997-12-22 | 2000-12-06 | Malcolm W. P. Strandberg | System and method for factoring a merged wave field into independent components |
EP0974329A3 (en) * | 1998-07-02 | 2001-09-12 | Altura Leiden Holding B.V. | Control apparatus for sanitary installations |
EP1224837A2 (en) * | 1999-10-25 | 2002-07-24 | Andrea Electronics Corporation | Super directional beamforming design and implementation |
KR100338657B1 (en) * | 1996-07-24 | 2002-09-19 | 에릭슨 인코포레이티드 | Echo Canceller for Nonlinear Circuits |
WO2003015457A2 (en) * | 2001-08-10 | 2003-02-20 | Rasmussen Digital Aps | Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment |
WO2003073786A1 (en) * | 2002-02-27 | 2003-09-04 | Shure Incorporated | Multiple beam microphone array having automatic mixing processing via speech detection |
WO2004025989A1 (en) * | 2002-09-13 | 2004-03-25 | Koninklijke Philips Electronics N.V. | Calibrating a first and a second microphone |
US6836243B2 (en) | 2000-09-02 | 2004-12-28 | Nokia Corporation | System and method for processing a signal being emitted from a target signal source into a noisy environment |
EP2040486A2 (en) * | 2007-09-18 | 2009-03-25 | Starkey Laboratories, Inc. | Method and apparatus for microphone matching for wearable directional hearing device using wearers own voice |
EP2245861B1 (en) * | 2008-01-29 | 2017-03-22 | QUALCOMM Incorporated | Enhanced blind source separation algorithm for highly correlated mixtures |
CN106710603A (en) * | 2016-12-23 | 2017-05-24 | 上海语知义信息技术有限公司 | Speech recognition method and system based on linear microphone array |
EP3255902A1 (en) * | 2016-06-06 | 2017-12-13 | Starkey Laboratories, Inc. | Method and apparatus for improving speech intelligibility in hearing devices using remote microphone |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4956867A (en) * | 1989-04-20 | 1990-09-11 | Massachusetts Institute Of Technology | Adaptive beamforming for noise reduction |
-
1994
- 1994-06-14 SE SE9402088A patent/SE502888C2/en not_active IP Right Cessation
-
1995
- 1995-06-13 AU AU27594/95A patent/AU2759495A/en not_active Abandoned
- 1995-06-13 JP JP8502045A patent/JPH10501668A/en active Pending
- 1995-06-13 EP EP95922851A patent/EP0765562A1/en not_active Withdrawn
- 1995-06-13 WO PCT/SE1995/000718 patent/WO1995034983A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4956867A (en) * | 1989-04-20 | 1990-09-11 | Massachusetts Institute Of Technology | Adaptive beamforming for noise reduction |
Non-Patent Citations (2)
Title |
---|
IEEE TRANSACTION ON VEHICULAR TECHNOLOGY, Volume 42, No. 4, November 1993, SVEN NORDHOLM et al., "Adaptive Array Noise Suppression of Handsfree Speaker Input in Cars", pages 514-518. * |
SPEECH COMMUNICATION, Volume 9, 1990, (North-Holland), DIRK VAN COMPERNOLLE et al., "Speech Recognition in Noisy Environments with the Aid of Microphone Arrays", pages 433-442. * |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100338657B1 (en) * | 1996-07-24 | 2002-09-19 | 에릭슨 인코포레이티드 | Echo Canceller for Nonlinear Circuits |
EP0883325A3 (en) * | 1997-06-02 | 2000-12-27 | The University Of Melbourne | Multi-strategy array processor |
US6603858B1 (en) | 1997-06-02 | 2003-08-05 | The University Of Melbourne | Multi-strategy array processor |
EP0883325A2 (en) * | 1997-06-02 | 1998-12-09 | The University Of Melbourne | Multi-strategy array processor |
AU747618B2 (en) * | 1997-07-11 | 2002-05-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for measuring signal level and delay at multiple sensors |
WO1999003091A1 (en) * | 1997-07-11 | 1999-01-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for measuring signal level and delay at multiple sensors |
US6430295B1 (en) | 1997-07-11 | 2002-08-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for measuring signal level and delay at multiple sensors |
EP1057291A1 (en) * | 1997-12-22 | 2000-12-06 | Malcolm W. P. Strandberg | System and method for factoring a merged wave field into independent components |
EP1057291A4 (en) * | 1997-12-22 | 2004-09-08 | Malcolm W P Strandberg | System and method for factoring a merged wave field into independent components |
DE19801389A1 (en) * | 1998-01-16 | 1999-07-22 | Cit Alcatel | Echo cancellation method with adaptive FIR filters |
US6493448B1 (en) | 1998-01-16 | 2002-12-10 | Alcatel | Process for echo suppression with adaptive fir filters |
AU751626B2 (en) * | 1998-01-30 | 2002-08-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Generating calibration signals for an adaptive beamformer |
WO1999039497A1 (en) * | 1998-01-30 | 1999-08-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Generating calibration signals for an adaptive beamformer |
CN100446530C (en) * | 1998-01-30 | 2008-12-24 | 艾利森电话股份有限公司 | Generating calibration signals for an adaptive beamformer |
US6549627B1 (en) | 1998-01-30 | 2003-04-15 | Telefonaktiebolaget Lm Ericsson | Generating calibration signals for an adaptive beamformer |
US6748088B1 (en) | 1998-03-23 | 2004-06-08 | Volkswagen Ag | Method and device for operating a microphone system, especially in a motor vehicle |
WO1999049698A1 (en) * | 1998-03-23 | 1999-09-30 | Volkswagen Aktiengesellschaft | Method and device for operating a microphone system, especially in a motor vehicle |
EP0974329A3 (en) * | 1998-07-02 | 2001-09-12 | Altura Leiden Holding B.V. | Control apparatus for sanitary installations |
EP1224837A4 (en) * | 1999-10-25 | 2003-05-21 | Andrea Electronics Corp | Super directional beamforming design and implementation |
EP1224837A2 (en) * | 1999-10-25 | 2002-07-24 | Andrea Electronics Corporation | Super directional beamforming design and implementation |
US6836243B2 (en) | 2000-09-02 | 2004-12-28 | Nokia Corporation | System and method for processing a signal being emitted from a target signal source into a noisy environment |
WO2003015457A3 (en) * | 2001-08-10 | 2004-03-11 | Rasmussen Digital Aps | Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment |
WO2003015457A2 (en) * | 2001-08-10 | 2003-02-20 | Rasmussen Digital Aps | Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment |
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 |
WO2003073786A1 (en) * | 2002-02-27 | 2003-09-04 | Shure Incorporated | Multiple beam microphone array having automatic mixing processing via speech detection |
WO2004025989A1 (en) * | 2002-09-13 | 2004-03-25 | Koninklijke Philips Electronics N.V. | Calibrating a first and a second microphone |
EP2040486A3 (en) * | 2007-09-18 | 2010-10-20 | Starkey Laboratories, Inc. | Method and apparatus for microphone matching for wearable directional hearing device using wearers own voice |
EP2040486A2 (en) * | 2007-09-18 | 2009-03-25 | Starkey Laboratories, Inc. | Method and apparatus for microphone matching for wearable directional hearing device using wearers own voice |
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 |
US9210518B2 (en) | 2007-09-18 | 2015-12-08 | Starkey Laboratories, Inc. | Method and apparatus for microphone matching for wearable directional hearing device using wearer's own voice |
EP2245861B1 (en) * | 2008-01-29 | 2017-03-22 | QUALCOMM Incorporated | Enhanced blind source separation algorithm for highly correlated mixtures |
EP3255902A1 (en) * | 2016-06-06 | 2017-12-13 | Starkey Laboratories, Inc. | Method and apparatus for improving speech intelligibility in hearing devices using remote microphone |
US10244333B2 (en) | 2016-06-06 | 2019-03-26 | Starkey Laboratories, Inc. | Method and apparatus for improving speech intelligibility in hearing devices using remote microphone |
CN106710603A (en) * | 2016-12-23 | 2017-05-24 | 上海语知义信息技术有限公司 | Speech recognition method and system based on linear microphone array |
CN106710603B (en) * | 2016-12-23 | 2019-08-06 | 云知声(上海)智能科技有限公司 | Utilize the audio recognition method and system of linear microphone array |
Also Published As
Publication number | Publication date |
---|---|
JPH10501668A (en) | 1998-02-10 |
SE9402088D0 (en) | 1994-06-14 |
EP0765562A1 (en) | 1997-04-02 |
AU2759495A (en) | 1996-01-05 |
SE502888C2 (en) | 1996-02-12 |
SE9402088L (en) | 1995-12-15 |
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