EP0802699A2 - Verfahren zum Elektronischerweitern des Abstands zwischen zwei akustischen/elektrischen Wandlern und einem Hörhilfegerät - Google Patents

Verfahren zum Elektronischerweitern des Abstands zwischen zwei akustischen/elektrischen Wandlern und einem Hörhilfegerät Download PDF

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Publication number
EP0802699A2
EP0802699A2 EP97112125A EP97112125A EP0802699A2 EP 0802699 A2 EP0802699 A2 EP 0802699A2 EP 97112125 A EP97112125 A EP 97112125A EP 97112125 A EP97112125 A EP 97112125A EP 0802699 A2 EP0802699 A2 EP 0802699A2
Authority
EP
European Patent Office
Prior art keywords
transducers
signal
frequency
acoustical
signals
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.)
Withdrawn
Application number
EP97112125A
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English (en)
French (fr)
Other versions
EP0802699A3 (de
Inventor
Joseph Maisano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonova Holding AG
Original Assignee
Phonak AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Phonak AG filed Critical Phonak AG
Priority to EP97112125A priority Critical patent/EP0802699A3/de
Publication of EP0802699A2 publication Critical patent/EP0802699A2/de
Publication of EP0802699A3 publication Critical patent/EP0802699A3/de
Priority to IL13399998A priority patent/IL133999A/en
Priority to CN98808183A priority patent/CN1267444A/zh
Priority to AU79281/98A priority patent/AU749652B2/en
Priority to EP98929585A priority patent/EP0997055B1/de
Priority to DE69805526T priority patent/DE69805526T2/de
Priority to JP2000503683A priority patent/JP2001510975A/ja
Priority to AT98929585T priority patent/ATE218025T1/de
Priority to PCT/IB1998/001069 priority patent/WO1999004598A1/en
Priority to TR2000/00119T priority patent/TR200000119T2/xx
Priority to NZ502350A priority patent/NZ502350A/xx
Priority to KR1020007000441A priority patent/KR20010021877A/ko
Priority to CA002296414A priority patent/CA2296414C/en
Priority to DK98929585T priority patent/DK0997055T3/da
Withdrawn legal-status Critical Current

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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
    • H04R3/00—Circuits for transducers, loudspeakers or 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
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing

Definitions

  • the present invention is generically directed on a technique according to which acoustical signals are received by at least two acoustical/electrical transducers as e.g. by multidirectional microphones, respective output signals of such transducers are electronically computed so as to generate a result signal which represents said acoustical signals weighted by a spatial characteristic of amplification as a function of spatial angle under which the acoustical signal impinges on the two transducers provided.
  • the result signal represents the received acoustical signal weighted by a spatial amplification characteristic as if reception of the acoustical signals had been done by means of e.g. an antenna with an according reception lobe or beam.
  • Figure 1 most generically shows such known technique for such "beam forming" on acoustical signals.
  • at least two multidirectional acoustical/electrical transducers 2 a and 2 b are provided, which both convert acoustical signal irrespective of their impinging direction ⁇ and thus substantially unweighted with respect to impinging direction ⁇ into electrical output signals A 1 and A 2 .
  • the output signals A 1 and A 2 are fed to an electronic signal processor unit 3 which generates from the input signals A 1 , A 2 a result signal A r .
  • acoustic signals may selectively be amplified dependent from the fact under which spatial angle ⁇ they impinge, i.e. under which spatial angle the transducer arrangement 2a, 2b "sees" an acoustical source.
  • Such processing of the output signals of two omnidirectional order transducers leads to a first order cardoid weighing function F 1 ( ⁇ ) as shown in Fig. 3.
  • F 1 ( ⁇ ) a first order cardoid weighing function
  • Fig. 3 By respectively selecting transducers with higher order acoustical to electrical conversion characteristic and/or by using more than two transducers, higher order - m - weighing functions F m ( ⁇ ) may be realised.
  • f r c/(4p) maximum amplification occurs of +6 dB at the first order cardoid and of +12 dB at a second order cardoid.
  • f r is about 7 kHz.
  • the distance p P is an important entity as may be seen e.g. from formula (8).
  • Formula (8) may be of no special handicap if such technique is used for narrow band signal detection or if no serious limits are encountered for geometrically providing the at least two transducers at a large mutual distance p P .
  • the first object of the present invention is reached by providing a method for electronically changing the distance between a first and a second acoustical/electrical transducer, generating, respectively, first and second electrical output signals which represent substantially simultaneously impinging acoustical signals, whereby the first and second electrical output signals are electronically treated so as to generate a result signal which result signal is a function of acoustical signals at least substantially simultaneously received at the two transducers and amplified by a spatial reception characteristic of amplification as a function of spatial angle under which the acoustical signals impinge on the two transducers, which method further comprises the steps of generating a third signal from at least one of the first and second output signals by shifting the phase of at least one of said output signals by an amount according to phase difference of the first and second output signals - being dependent from the physical distance p P of said two transducers - multiplied by a constant factor not equal to unity or by a factor which is a function of frequency, and generating the result signal from
  • Multiplying the phase difference by a constant factor does nevertheless not affect the roll-off according to fig. 4.
  • This roll-off is significantly improved, leading to an enlarged frequency band B r according to fig. 4 if the predetermined function of frequency is selected as a function which is at least in a first approximation inversely proportional to the frequency of the acoustic signal.
  • a hearing aid apparatus which comprises at least two acoustical/electrical transducers spaced from each other by a predetermined distance, whereby the at least two transducers generate, respectively, first and second electrical output signals and wherein the outputs of the acoustical/electrical transducers are operationally connected to a signal processing unit which generates a result output signal from the first and second output signals of the transducers, which result output signal being a function of acoustical signals received at least substantially simultaneously at the two transducers and amplified by a spatial reception characteristic of amplification as a function of spatial angle under which the acoustical signals impinge on the two transducers and which further comprises
  • This phase difference is determined and is multiplied by a value dependent from frequency, thus with the respective value of a function M( ⁇ ), which may be also a constant M o # 1.
  • f rV is reduced by the factor 1 M ⁇ , taken M ⁇ > 1.
  • fig. 7 there is schematically shown a preferred realisation form of an inventive apparatus in a simplified manner, especially for implementing the inventive method into an inventive hearing aid apparatus.
  • the output signals of the acoustical/electrical transducer 2 a and 2 b are fed to respective analogue to digital converters 20a, 20b, the outputs thereof being input to time domain to frequency domain - TFC - converter units as to Fast-Fourier Transform units 22a and 22b.
  • This multiplication according to (3 V ) is done at a spectral multiplication unit 28.
  • Signal A 1 in its spectral representation is then spectrally phase shifted at a spectral phase shifter unit 29 by the multiplied spectral phase difference signals output by multiplier unit 28.
  • the resulting spectrum is transformed back by a frequency to time domain converter - FTC - as by an Inverse-Fast-Fourier-Transform unit 24 to result in A r# .
  • the frequency dependent function M( ⁇ ) is selected to be, at least in a first approximation, M( ⁇ ) ⁇ 1 ⁇
  • the spatial weighing function may be selectively tailored, thereby e.g. to completely suppress signals from unwanted directions, e.g. only to pass signals from within a narrow range of target direction and suppress all others.
  • the present invention under its principal object makes it possible to realise beam forming with at least two transducers separated by only a predetermined small distance, due to the fact that electronically there is provided a virtual transducer distance from one of the two physically provided transducers.

Landscapes

  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Otolaryngology (AREA)
  • Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
EP97112125A 1997-07-16 1997-07-16 Verfahren zum Elektronischerweitern des Abstands zwischen zwei akustischen/elektrischen Wandlern und einem Hörhilfegerät Withdrawn EP0802699A3 (de)

Priority Applications (14)

Application Number Priority Date Filing Date Title
EP97112125A EP0802699A3 (de) 1997-07-16 1997-07-16 Verfahren zum Elektronischerweitern des Abstands zwischen zwei akustischen/elektrischen Wandlern und einem Hörhilfegerät
DK98929585T DK0997055T3 (da) 1997-07-16 1998-07-14 Fremgangsmåde til elektronisk udvælgelse af afhængigheden af et udgangssignal fra den rumlige indfaldsvinkel af et akustisk signal samt høreapparat
CA002296414A CA2296414C (en) 1997-07-16 1998-07-14 Method for electronically selecting the dependency of an output signal from the spatial angle of acoustic signal impingement and hearing aid apparatus
DE69805526T DE69805526T2 (de) 1997-07-16 1998-07-14 Verfahren zur elektronischen auswahl der abhängigkeit eines ausgangssignals vom räumlichen winkel des akustischen aufprallsignals und hörhilfegerät
PCT/IB1998/001069 WO1999004598A1 (en) 1997-07-16 1998-07-14 Method for electronically selecting the dependency of an output signal from the spatial angle of acoustic signal impingement and hearing aid apparatus
AU79281/98A AU749652B2 (en) 1997-07-16 1998-07-14 Method for electronically selecting the dependency of an output signal from the spatial angle of acoustic signal impingement and hearing aid apparatus
EP98929585A EP0997055B1 (de) 1997-07-16 1998-07-14 Verfahren zur elektronischen auswahl der abhängigkeit eines ausgangssignals vom räumlichen winkel des akustischen aufprallsignals und hörhilfegerät
IL13399998A IL133999A (en) 1997-07-16 1998-07-14 Method for electronically selecting the dependence of the outgoing signal from a spatial angle of an intrusive acoustic signal and a hearing aid
JP2000503683A JP2001510975A (ja) 1997-07-16 1998-07-14 音響信号衝突の空間角に対する出力信号の従属関係を電子的に選択する方法および補聴器装置
AT98929585T ATE218025T1 (de) 1997-07-16 1998-07-14 Verfahren zur elektronischen auswahl der abhängigkeit eines ausgangssignals vom räumlichen winkel des akustischen aufprallsignals und hörhilfegerät
CN98808183A CN1267444A (zh) 1997-07-16 1998-07-14 用来电子选择输出信号与声信号碰撞空间角的相关性的方法和助听器设备
TR2000/00119T TR200000119T2 (tr) 1997-07-16 1998-07-14 Akustik sinyal çarpmasının mesafeli açısından, çıktı sinyalinin bağımlılığının elektronik seçimi
NZ502350A NZ502350A (en) 1997-07-16 1998-07-14 Processing of hearing aid transducer inputs to enhance directional response
KR1020007000441A KR20010021877A (ko) 1997-07-16 1998-07-14 음향 신호 충돌의 공간각 및 보청기로부터의 출력 신호의의존성을 전기적으로 선택하는 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97112125A EP0802699A3 (de) 1997-07-16 1997-07-16 Verfahren zum Elektronischerweitern des Abstands zwischen zwei akustischen/elektrischen Wandlern und einem Hörhilfegerät

Publications (2)

Publication Number Publication Date
EP0802699A2 true EP0802699A2 (de) 1997-10-22
EP0802699A3 EP0802699A3 (de) 1998-02-25

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EP97112125A Withdrawn EP0802699A3 (de) 1997-07-16 1997-07-16 Verfahren zum Elektronischerweitern des Abstands zwischen zwei akustischen/elektrischen Wandlern und einem Hörhilfegerät
EP98929585A Expired - Lifetime EP0997055B1 (de) 1997-07-16 1998-07-14 Verfahren zur elektronischen auswahl der abhängigkeit eines ausgangssignals vom räumlichen winkel des akustischen aufprallsignals und hörhilfegerät

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP98929585A Expired - Lifetime EP0997055B1 (de) 1997-07-16 1998-07-14 Verfahren zur elektronischen auswahl der abhängigkeit eines ausgangssignals vom räumlichen winkel des akustischen aufprallsignals und hörhilfegerät

Country Status (13)

Country Link
EP (2) EP0802699A3 (de)
JP (1) JP2001510975A (de)
KR (1) KR20010021877A (de)
CN (1) CN1267444A (de)
AT (1) ATE218025T1 (de)
AU (1) AU749652B2 (de)
CA (1) CA2296414C (de)
DE (1) DE69805526T2 (de)
DK (1) DK0997055T3 (de)
IL (1) IL133999A (de)
NZ (1) NZ502350A (de)
TR (1) TR200000119T2 (de)
WO (1) WO1999004598A1 (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000019770A1 (de) * 1998-09-29 2000-04-06 Siemens Audiologische Technik Gmbh Hörgerät und verfahren zum verarbeiten von mikrofonsignalen in einem hörgerät
EP1035752A1 (de) * 1999-03-05 2000-09-13 Phonak Ag Verfahren zur Formgebung der Empfangsverstärkungsraumcharakteristik einer Umwandleranordnung und Umwandleranordnung
WO2001052596A2 (en) * 2001-04-18 2001-07-19 Phonak Ag A method for analyzing an acoustical environment and a system to do so
WO2001087011A2 (en) * 2000-05-10 2001-11-15 The Board Of Trustees Of The University Of Illinois Interference suppression techniques
EP1351544A2 (de) * 2002-03-08 2003-10-08 Gennum Corporation Rauscharmes Richtmikrofonsystem
WO2005109951A1 (en) * 2004-05-05 2005-11-17 Deka Products Limited Partnership Angular discrimination of acoustical or radio signals
US6987856B1 (en) 1996-06-19 2006-01-17 Board Of Trustees Of The University Of Illinois Binaural signal processing techniques
US7206423B1 (en) 2000-05-10 2007-04-17 Board Of Trustees Of University Of Illinois Intrabody communication for a hearing aid
EP1916872A2 (de) * 2006-10-23 2008-04-30 Siemens Audiologische Technik GmbH Differentielles Richtmikrofonsystem und Hörhilfsgerät mit einem solchen differentiellen Richtmikrofonsystem
US7502479B2 (en) 2001-04-18 2009-03-10 Phonak Ag Method for analyzing an acoustical environment and a system to do so
US7945064B2 (en) 2003-04-09 2011-05-17 Board Of Trustees Of The University Of Illinois Intrabody communication with ultrasound
US20110158426A1 (en) * 2009-12-28 2011-06-30 Fujitsu Limited Signal processing apparatus, microphone array device, and storage medium storing signal processing program
US8103030B2 (en) 2006-10-23 2012-01-24 Siemens Audiologische Technik Gmbh Differential directional microphone system and hearing aid device with such a differential directional microphone system
US8565445B2 (en) 2008-11-21 2013-10-22 Fujitsu Limited Combining audio signals based on ranges of phase difference
DE102010023615B4 (de) * 2009-06-23 2014-01-02 Fujitsu Limited Signalverarbeitungsvorrichtung und Signalverarbeitungsverfahren
GB2575491A (en) * 2018-07-12 2020-01-15 Centricam Tech Limited A microphone system

Families Citing this family (17)

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US6307901B1 (en) * 2000-04-24 2001-10-23 Motorola, Inc. Turbo decoder with decision feedback equalization
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
US20040175008A1 (en) 2003-03-07 2004-09-09 Hans-Ueli Roeck Method for producing control signals, method of controlling signal and a hearing device
US7286672B2 (en) 2003-03-07 2007-10-23 Phonak Ag Binaural hearing device and method for controlling a hearing device system
US8027495B2 (en) 2003-03-07 2011-09-27 Phonak Ag Binaural hearing device and method for controlling a hearing device system
EP1326478B1 (de) 2003-03-07 2014-11-05 Phonak Ag Verfahren zur erzeugung von kontrollsignalen und binaurales hörgerätesystem
DE10331956C5 (de) * 2003-07-16 2010-11-18 Siemens Audiologische Technik Gmbh Hörhilfegerät sowie Verfahren zum Betrieb eines Hörhilfegerätes mit einem Mikrofonsystem, bei dem unterschiedliche Richtcharakteistiken einstellbar sind
EP1513371B1 (de) 2004-10-19 2012-08-15 Phonak Ag Verfahren zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät
US7472041B2 (en) * 2005-08-26 2008-12-30 Step Communications Corporation Method and apparatus for accommodating device and/or signal mismatch in a sensor array
US7415372B2 (en) 2005-08-26 2008-08-19 Step Communications Corporation Method and apparatus for improving noise discrimination in multiple sensor pairs
US7619563B2 (en) 2005-08-26 2009-11-17 Step Communications Corporation Beam former using phase difference enhancement
EP2095678A1 (de) 2006-11-24 2009-09-02 Rasmussen Digital APS Signalverarbeitung unter verwendung eines räumlichen filters
EP2262277B1 (de) * 2007-11-13 2012-01-04 AKG Acoustics GmbH Mikrofonanordnung
WO2009062213A1 (en) 2007-11-13 2009-05-22 Akg Acoustics Gmbh Microphone arrangement, having two pressure gradient transducers
WO2009105793A1 (en) 2008-02-26 2009-09-03 Akg Acoustics Gmbh Transducer assembly
JP5388379B2 (ja) * 2009-04-28 2014-01-15 パナソニック株式会社 補聴装置、及び補聴方法
JP5368272B2 (ja) * 2009-11-20 2013-12-18 ジェイ・アール・シー特機株式会社 音響信号処理装置

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Publication number Priority date Publication date Assignee Title
US4751738A (en) * 1984-11-29 1988-06-14 The Board Of Trustees Of The Leland Stanford Junior University Directional hearing aid
JPH0579899A (ja) * 1991-09-24 1993-03-30 Ono Sokki Co Ltd 音響インテンシテイ計測装置
EP0557166A1 (de) * 1992-02-18 1993-08-25 Alcatel Mobile Communication France Rauchverminderungsverfahren in einem Sprachsignal
EP0652686A1 (de) * 1993-11-05 1995-05-10 AT&T Corp. Adaptive Mikrophongruppierung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4751738A (en) * 1984-11-29 1988-06-14 The Board Of Trustees Of The Leland Stanford Junior University Directional hearing aid
JPH0579899A (ja) * 1991-09-24 1993-03-30 Ono Sokki Co Ltd 音響インテンシテイ計測装置
EP0557166A1 (de) * 1992-02-18 1993-08-25 Alcatel Mobile Communication France Rauchverminderungsverfahren in einem Sprachsignal
EP0652686A1 (de) * 1993-11-05 1995-05-10 AT&T Corp. Adaptive Mikrophongruppierung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELECTRONICS & COMMUNICATIONS IN JAPAN, vol. 67, no. 12, December 1984, SILVER SPRING , MARYLAND , U.S.A., pages 19-28, XP002050302 Y.KANEDA AND M.TOHYAMA: "NOISE SUPPRESSION SIGNAL PROCESSING USING 2-POINT RECEIVED." *

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6987856B1 (en) 1996-06-19 2006-01-17 Board Of Trustees Of The University Of Illinois Binaural signal processing techniques
WO2000019770A1 (de) * 1998-09-29 2000-04-06 Siemens Audiologische Technik Gmbh Hörgerät und verfahren zum verarbeiten von mikrofonsignalen in einem hörgerät
US6751325B1 (en) 1998-09-29 2004-06-15 Siemens Audiologische Technik Gmbh Hearing aid and method for processing microphone signals in a hearing aid
AU758366B2 (en) * 1999-03-05 2003-03-20 Phonak Ag Method for shaping the spatial reception amplification characteristic of a converter arrangement and converter arrangement
EP1035752A1 (de) * 1999-03-05 2000-09-13 Phonak Ag Verfahren zur Formgebung der Empfangsverstärkungsraumcharakteristik einer Umwandleranordnung und Umwandleranordnung
WO2000054553A1 (en) * 1999-03-05 2000-09-14 Phonak Ag Method for shaping the spatial reception amplification characteristic of a converter arrangement and converter arrangement
US6522756B1 (en) 1999-03-05 2003-02-18 Phonak Ag Method for shaping the spatial reception amplification characteristic of a converter arrangement and converter arrangement
US7206423B1 (en) 2000-05-10 2007-04-17 Board Of Trustees Of University Of Illinois Intrabody communication for a hearing aid
WO2001087011A2 (en) * 2000-05-10 2001-11-15 The Board Of Trustees Of The University Of Illinois Interference suppression techniques
WO2001087011A3 (en) * 2000-05-10 2003-03-20 Univ Illinois Interference suppression techniques
US7502479B2 (en) 2001-04-18 2009-03-10 Phonak Ag Method for analyzing an acoustical environment and a system to do so
US6947570B2 (en) 2001-04-18 2005-09-20 Phonak Ag Method for analyzing an acoustical environment and a system to do so
WO2001052596A3 (en) * 2001-04-18 2002-06-13 Phonak Ag A method for analyzing an acoustical environment and a system to do so
WO2001052596A2 (en) * 2001-04-18 2001-07-19 Phonak Ag A method for analyzing an acoustical environment and a system to do so
US7409068B2 (en) 2002-03-08 2008-08-05 Sound Design Technologies, Ltd. Low-noise directional microphone system
EP1351544A3 (de) * 2002-03-08 2008-03-19 Gennum Corporation Rauscharmes Richtmikrofonsystem
EP1351544A2 (de) * 2002-03-08 2003-10-08 Gennum Corporation Rauscharmes Richtmikrofonsystem
US7945064B2 (en) 2003-04-09 2011-05-17 Board Of Trustees Of The University Of Illinois Intrabody communication with ultrasound
WO2005109951A1 (en) * 2004-05-05 2005-11-17 Deka Products Limited Partnership Angular discrimination of acoustical or radio signals
US8275147B2 (en) 2004-05-05 2012-09-25 Deka Products Limited Partnership Selective shaping of communication signals
EP1916872A2 (de) * 2006-10-23 2008-04-30 Siemens Audiologische Technik GmbH Differentielles Richtmikrofonsystem und Hörhilfsgerät mit einem solchen differentiellen Richtmikrofonsystem
EP1916872A3 (de) * 2006-10-23 2011-08-17 Siemens Audiologische Technik GmbH Differentielles Richtmikrofonsystem und Hörhilfsgerät mit einem solchen differentiellen Richtmikrofonsystem
US8103030B2 (en) 2006-10-23 2012-01-24 Siemens Audiologische Technik Gmbh Differential directional microphone system and hearing aid device with such a differential directional microphone system
US8565445B2 (en) 2008-11-21 2013-10-22 Fujitsu Limited Combining audio signals based on ranges of phase difference
DE102009052539B4 (de) * 2008-11-21 2014-01-02 Fujitsu Ltd. Signalverarbeitungseinheit und Signalverarbeitungsverfahren
DE102010023615B4 (de) * 2009-06-23 2014-01-02 Fujitsu Limited Signalverarbeitungsvorrichtung und Signalverarbeitungsverfahren
US8638952B2 (en) 2009-06-23 2014-01-28 Fujitsu Limited Signal processing apparatus and signal processing method
US20110158426A1 (en) * 2009-12-28 2011-06-30 Fujitsu Limited Signal processing apparatus, microphone array device, and storage medium storing signal processing program
DE102010055476B4 (de) * 2009-12-28 2014-01-02 Fujitsu Ltd. Signalverarbeitungsgerät, Mikrofonarrayvorrichtung und Speichermedium, das ein Signalverarbeitungsprogramm speichert
GB2575491A (en) * 2018-07-12 2020-01-15 Centricam Tech Limited A microphone system

Also Published As

Publication number Publication date
DE69805526T2 (de) 2002-11-28
DK0997055T3 (da) 2002-07-22
WO1999004598A1 (en) 1999-01-28
IL133999A0 (en) 2001-04-30
AU749652B2 (en) 2002-06-27
CA2296414C (en) 2005-03-15
JP2001510975A (ja) 2001-08-07
EP0997055A1 (de) 2000-05-03
EP0997055B1 (de) 2002-05-22
NZ502350A (en) 2002-10-25
EP0802699A3 (de) 1998-02-25
KR20010021877A (ko) 2001-03-15
IL133999A (en) 2004-03-28
CN1267444A (zh) 2000-09-20
AU7928198A (en) 1999-02-10
CA2296414A1 (en) 1999-01-28
TR200000119T2 (tr) 2000-05-22
DE69805526D1 (de) 2002-06-27
ATE218025T1 (de) 2002-06-15

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