EP0601934A1 - Verbesserung der Verfahren und Vorrichtung, von aussen Gerauschen einen bestimmten, vorzugweise in einem Raum angenordnete, zum schutzen - Google Patents

Verbesserung der Verfahren und Vorrichtung, von aussen Gerauschen einen bestimmten, vorzugweise in einem Raum angenordnete, zum schutzen Download PDF

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Publication number
EP0601934A1
EP0601934A1 EP93402974A EP93402974A EP0601934A1 EP 0601934 A1 EP0601934 A1 EP 0601934A1 EP 93402974 A EP93402974 A EP 93402974A EP 93402974 A EP93402974 A EP 93402974A EP 0601934 A1 EP0601934 A1 EP 0601934A1
Authority
EP
European Patent Office
Prior art keywords
sources
sensors
acoustic
battery
function
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
Application number
EP93402974A
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English (en)
French (fr)
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EP0601934B1 (de
Inventor
Jacques Lewiner
Mathias Fink
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.)
Decaux Jean-Claude
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Decaux Jean-Claude
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Filing date
Publication date
Application filed by Decaux Jean-Claude filed Critical Decaux Jean-Claude
Publication of EP0601934A1 publication Critical patent/EP0601934A1/de
Application granted granted Critical
Publication of EP0601934B1 publication Critical patent/EP0601934B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G10K11/346—Circuits therefor using phase variation
    • 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
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • 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
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • 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
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • 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
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/02—Synthesis of acoustic waves
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/103—Three dimensional
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/119—Radiation control, e.g. control of sound radiated by vibrating structures
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3023—Estimation of noise, e.g. on error signals
    • G10K2210/30232—Transfer functions, e.g. impulse response
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3041—Offline
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3047—Prediction, e.g. of future values of noise

Definitions

  • the volumes in question are in particular those intended to be occupied by the head of an individual, in particular in a seated or lying position: when the desired acoustic protection is obtained, the individual concerned is protected from external acoustic aggressions both that his head remains placed inside such a volume.
  • the random noises could not be treated correctly in this way and, when the volumes considered are inside rooms, delimited laterally by partitions, lower by a floor and higher by a ceiling, one does not To date, it has hardly managed to control the phenomena of reflection or reverberation of the noises to be neutralized on the various walls delimiting said premises as well as on other obstacles, such as furniture, present in these premises.
  • the object of the invention is, above all to remedy all of these drawbacks by making it possible to protect a volume placed inside a room from noise of any kind produced outside this room, and by particular from certain privileged directions corresponding for example to windows.
  • the invention also relates to the batteries of acoustic elements specially designed to equip the above devices as well as the methods for determining the impulse responses f ij (t) and gk (t) which are used for the preparation of the signals S.
  • the invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
  • the noises E are, for example, those which come from outside the premises through an open or closed window 5.
  • Volume 2 has for example the shape of a sphere or a cylinder of revolution whose diameter is of the order of 1 meter and whose central portion is intended to be occupied by the head of a person whom the we want to isolate noise E, this person being for example sitting in front of a desk or lying in a bed.
  • the present invention proposes to solve the problem of attenuation, or even suppression, of undesirable noise in the volume 2 defined above, even if these noises are random and if they are reflected or reverberated by the walls. 4 of room 3.
  • the first 6 of these two batteries defines a reticulated network, generally three-dimensional, of points or "nodes" distinct i-1, i, i + 1 ... occupying at least partially the volume 2 to be acoustically protected.
  • the acoustic elements which it comprises are, initially, acoustic sources (loudspeakers or the like) 10 i-1 , 10 i , 10 i + 1 ... which are located at said nodes.
  • Each of the impulse response laws is then determined as a function of the time tf ij (t) corresponding to each of the noises generated on each sensor 11 j by the emission of a short acoustic pulse from each source 10.
  • the resulting noise which arrives at each of the points i of the battery 6 is calculated for each given global noise E j (t) received at each of the points j.
  • the total noise F i (t) which would reach each of the points i is then determined in response to the noises E j (t) received by the set of points j, noises which are precisely those symbolized by the arrow 1 above.
  • This total noise F i (t) is equal to:
  • Each of the sources 10 of the battery 6 is then replaced by acoustic sensors 12 arranged in exactly the same locations i as these sources.
  • this battery 13 is constituted by a rigid frame 14 now separated the from each other a plurality of acoustic sources 15 k-1 , 15 k , 15 k + 1 ... located at distinct points or "nodes" k-1, k, k + 1 ... of said framework.
  • Each impulse response gk (t) corresponding to the noise which is generated on the sensor 12 by the emission of a short acoustic impulse from the source 15 k is then determined .
  • each function gk (t) is strictly identical to the reciprocal function gk (t).
  • This formula is precious because it makes it possible to determine in an extremely precise manner the noises which would result, at the level of the battery 13, from the production of the noises F i (t) at the level of the various points i of the first battery 6.
  • the reverse wavefront corresponding to these counter-signals successively occupies the various positions occupied in the past by the initial "direct" wavefront, the phenomenon observed being comparable to the projection of a cinematographic film upside down.
  • Volume 2 then remains silent and inaccessible to said noises E j (t), whatever their natures and intensities and whatever the reflections or reverberations undergone by some of their components before reaching said volume.
  • the battery 6 can be completely eliminated, which completely releases the surroundings of the acoustically isolated volume 2.
  • the counter-noises C To obtain the desired neutralization of each noise F i (t), the counter-noises C must reach the level of the points i at the same time as these noises.
  • Sampling is carried out at a rate which corresponds substantially to the eighth of the shortest period characterizing the sound waves to be processed, that is to say at the highest frequency of the range used for the sensitivity of the sensors.
  • the frequency range to which the sensors are sensitive is advantageously between 10 Hz and 10,000 Hz.
  • the sampling frequency is equal to 80 kHz, which corresponds to a sampling carried out every 12 microseconds.
  • these distances are advantageously given a value equal to half the smallest wavelength of the range of frequencies concerned.
  • the distance in question can be of the order of 10 centimeters, which provides specially good acoustic protection with respect to the low frequency components of the noises to be neutralized: the wavelength is indeed 33 centimeters. for a frequency of 1000 Hz.
  • this number is equal to several tens, being in particular of the order of 50 to 100.
  • a digital signal processor of the DSP (Digital Signal Processor) type can be assigned to each of the sensors 11 j.
  • the storage to be carried out for the actual implementation of the invention comprises 2,080 ⁇ 15,000 bytes, that is to say 31.20 mega-bytes, which represents a completely reasonable number.
  • This device has many advantages over those previously known and in particular that of providing acoustic protection even against random noise and even if the volume considered is placed inside a room whose walls are not specially treated to oppose acoustic reflections.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Building Environments (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Casings For Electric Apparatus (AREA)
  • Tires In General (AREA)
  • Fluid-Damping Devices (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Braking Arrangements (AREA)
  • Transmitters (AREA)
  • Secondary Cells (AREA)
  • Fuses (AREA)
  • Buffer Packaging (AREA)
  • Materials For Medical Uses (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
EP93402974A 1992-12-11 1993-12-09 Verbesserung des Verfahrens und der Vorrichtung zum Schutz eines vorzugsweise innerhalb eines Raumes angeordneten gegebenen Volumens von aussen kommenden Geräuschen Expired - Lifetime EP0601934B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214952A FR2699205B1 (fr) 1992-12-11 1992-12-11 Perfectionnements aux procédés et dispositifs pour protéger des bruits extérieurs un volume donné, de préférence disposé à l'intérieur d'un local.
FR9214952 1992-12-11

Publications (2)

Publication Number Publication Date
EP0601934A1 true EP0601934A1 (de) 1994-06-15
EP0601934B1 EP0601934B1 (de) 1998-09-02

Family

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Application Number Title Priority Date Filing Date
EP93402974A Expired - Lifetime EP0601934B1 (de) 1992-12-11 1993-12-09 Verbesserung des Verfahrens und der Vorrichtung zum Schutz eines vorzugsweise innerhalb eines Raumes angeordneten gegebenen Volumens von aussen kommenden Geräuschen

Country Status (19)

Country Link
US (1) US5438624A (de)
EP (1) EP0601934B1 (de)
JP (1) JPH06236191A (de)
KR (1) KR100306270B1 (de)
CN (1) CN1092128A (de)
AT (1) ATE170655T1 (de)
AU (1) AU669020B2 (de)
BR (1) BR9305018A (de)
CA (1) CA2110763A1 (de)
DE (1) DE69320770T2 (de)
DK (1) DK0601934T3 (de)
ES (1) ES2123040T3 (de)
FI (1) FI935515A (de)
FR (1) FR2699205B1 (de)
IL (1) IL107919A (de)
NO (2) NO934511D0 (de)
PL (1) PL173598B1 (de)
RU (1) RU2132089C1 (de)
TW (1) TW293059B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031872A1 (fr) * 1995-04-04 1996-10-10 Technofirst Procede et dispositif personnels d'attenuation acoustique active a reponse impulsionelle invariante
WO1997003438A1 (fr) * 1995-07-13 1997-01-30 Societe Pour Les Applications Du Retournement Temporel Procede et dispositif de focalisation d'ondes acoustiques
WO1997008683A1 (en) * 1995-08-29 1997-03-06 United Technologies Corporation Active noise control system using phased-array sensors
FR2771541A1 (fr) * 1997-11-21 1999-05-28 Jean Claude Decaux Procede et dispositif d'insonorisation active

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EP0700620B1 (de) * 1994-03-24 2001-10-17 Koninklijke Philips Electronics N.V. Audiovisuelle vorrichtung und diese anwendendes system
FR2726115B1 (fr) * 1994-10-20 1996-12-06 Comptoir De La Technologie Dispositif actif d'attenuation de l'intensite sonore
GB9506725D0 (en) * 1995-03-31 1995-05-24 Hooley Anthony Improvements in or relating to loudspeakers
JPH0944168A (ja) 1995-08-03 1997-02-14 Taisei Denki Kogyo:Kk 複数階建築物における床衝撃音消音装置
WO2001023104A2 (en) 1999-09-29 2001-04-05 1...Limited Method and apparatus to direct sound using an array of output transducers
FR2799873B1 (fr) 1999-10-18 2002-02-08 Comptoir De La Technologie Dispositif actif d'attenuation de l'intensite sonore
CN100539737C (zh) * 2001-03-27 2009-09-09 1...有限公司 产生声场的方法和装置
GB0124352D0 (en) * 2001-10-11 2001-11-28 1 Ltd Signal processing device for acoustic transducer array
GB0203895D0 (en) * 2002-02-19 2002-04-03 1 Ltd Compact surround-sound system
GB0301093D0 (en) * 2003-01-17 2003-02-19 1 Ltd Set-up method for array-type sound systems
GB0321676D0 (en) * 2003-09-16 2003-10-15 1 Ltd Digital loudspeaker
GB0415626D0 (en) * 2004-07-13 2004-08-18 1 Ltd Directional microphone
US20070269071A1 (en) * 2004-08-10 2007-11-22 1...Limited Non-Planar Transducer Arrays
GB0514361D0 (en) * 2005-07-12 2005-08-17 1 Ltd Compact surround sound effects system
KR101295848B1 (ko) * 2008-12-17 2013-08-12 삼성전자주식회사 어레이스피커 시스템에서 음향을 포커싱하는 장치 및 방법
KR101613683B1 (ko) * 2009-10-20 2016-04-20 삼성전자주식회사 음향 방사 패턴 생성 장치 및 방법
TWI407430B (zh) * 2009-11-19 2013-09-01 Univ Nat Changhua Education 音波抑制裝置及其方法
US10134379B2 (en) 2016-03-01 2018-11-20 Guardian Glass, LLC Acoustic wall assembly having double-wall configuration and passive noise-disruptive properties, and/or method of making and/or using the same
US10354638B2 (en) * 2016-03-01 2019-07-16 Guardian Glass, LLC Acoustic wall assembly having active noise-disruptive properties, and/or method of making and/or using the same
US10726855B2 (en) 2017-03-15 2020-07-28 Guardian Glass, Llc. Speech privacy system and/or associated method
US10373626B2 (en) 2017-03-15 2019-08-06 Guardian Glass, LLC Speech privacy system and/or associated method
US10304473B2 (en) 2017-03-15 2019-05-28 Guardian Glass, LLC Speech privacy system and/or associated method
CN110164409A (zh) * 2019-06-14 2019-08-23 苏州中车建设工程有限公司 消声模块易拆防护套、阵列式消声器及安装拆除方法

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WO1992020063A1 (en) * 1991-05-08 1992-11-12 Sri International Method and apparatus for the active reduction of compression waves

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GB2191063A (en) * 1986-05-01 1987-12-02 Plessey Co Plc Active noise suppression
EP0510864A2 (de) * 1991-04-25 1992-10-28 Nelson Industries, Inc. Mehrkanalige aktive Schalldämpfungsanordnung
WO1992020063A1 (en) * 1991-05-08 1992-11-12 Sri International Method and apparatus for the active reduction of compression waves

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Title
C. PRADA ET AL.: "The iterative time reversal mirror: Asolution to self-focusing in the pulse echo mode.", JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 90, no. 2, August 1991 (1991-08-01), NEW YORK US, pages 1119 - 1129, XP000222986, DOI: doi:10.1121/1.402301 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031872A1 (fr) * 1995-04-04 1996-10-10 Technofirst Procede et dispositif personnels d'attenuation acoustique active a reponse impulsionelle invariante
FR2732807A1 (fr) * 1995-04-04 1996-10-11 Technofirst Procede et dispositif personnels d'attenuation acoustique active, siege equipe du dispositif correspondant, et espace a attenuation acoustique active obtenu
US5987144A (en) * 1995-04-04 1999-11-16 Technofirst Personal active noise cancellation method and device having invariant impulse response
WO1997003438A1 (fr) * 1995-07-13 1997-01-30 Societe Pour Les Applications Du Retournement Temporel Procede et dispositif de focalisation d'ondes acoustiques
WO1997008683A1 (en) * 1995-08-29 1997-03-06 United Technologies Corporation Active noise control system using phased-array sensors
US5699437A (en) * 1995-08-29 1997-12-16 United Technologies Corporation Active noise control system using phased-array sensors
FR2771541A1 (fr) * 1997-11-21 1999-05-28 Jean Claude Decaux Procede et dispositif d'insonorisation active
WO1999027520A1 (fr) * 1997-11-21 1999-06-03 Decaux Jean Claude Procede et dispositif d'insonorisation active

Also Published As

Publication number Publication date
AU669020B2 (en) 1996-05-23
EP0601934B1 (de) 1998-09-02
CA2110763A1 (en) 1994-06-12
FI935515A (fi) 1994-06-12
IL107919A0 (en) 1994-04-12
ATE170655T1 (de) 1998-09-15
IL107919A (en) 1996-07-23
RU2132089C1 (ru) 1999-06-20
CN1092128A (zh) 1994-09-14
DE69320770D1 (de) 1998-10-08
FR2699205B1 (fr) 1995-03-10
US5438624A (en) 1995-08-01
TW293059B (de) 1996-12-11
DE69320770T2 (de) 1999-05-06
FI935515A0 (fi) 1993-12-09
KR100306270B1 (ko) 2001-11-30
PL173598B1 (pl) 1998-03-31
ES2123040T3 (es) 1999-01-01
NO934511L (no) 1994-06-13
DK0601934T3 (da) 1999-05-31
FR2699205A1 (fr) 1994-06-17
NO934511D0 (no) 1993-12-09
KR940015967A (ko) 1994-07-22
PL301416A1 (en) 1994-06-13
BR9305018A (pt) 1994-06-14
NO301086B1 (no) 1997-09-08
AU5230293A (en) 1994-06-23
JPH06236191A (ja) 1994-08-23

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