EP0601934B1 - Perfectionnements aux procédés et dispositifs pour protéger des bruits extérieurs un volume donné, de préférence disposé à l'intérieur d'un local - Google Patents

Perfectionnements aux procédés et dispositifs pour protéger des bruits extérieurs un volume donné, de préférence disposé à l'intérieur d'un local Download PDF

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Publication number
EP0601934B1
EP0601934B1 EP93402974A EP93402974A EP0601934B1 EP 0601934 B1 EP0601934 B1 EP 0601934B1 EP 93402974 A EP93402974 A EP 93402974A EP 93402974 A EP93402974 A EP 93402974A EP 0601934 B1 EP0601934 B1 EP 0601934B1
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EP
European Patent Office
Prior art keywords
sources
sensors
acoustic
function
volume
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.)
Expired - Lifetime
Application number
EP93402974A
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German (de)
English (en)
French (fr)
Other versions
EP0601934A1 (fr
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
Original Assignee
Decaux Jean-Claude
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 Decaux Jean-Claude filed Critical Decaux Jean-Claude
Publication of EP0601934A1 publication Critical patent/EP0601934A1/fr
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Publication of EP0601934B1 publication Critical patent/EP0601934B1/fr
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 notably those intended to be occupied by the head of an individual, especially when seated or lying down: when the desired acoustic protection is obtained, the individual concerned is safe from acoustic aggression outside as long as his head remains at inside such a volume.
  • the random noises could not be treated properly in this way and when volumes considered are inside premises, laterally delimited by partitions, lower by a floor and above by a ceiling, one is hardly managed until today to control the phenomena of reflection or reverberation of the noises to neutralize 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 as defined in the claims is, above all, to remedy all of these disadvantages by protecting a volume arranged inside a room opposite noises of all kinds produced outside this room, and in particular from certain directions privileged 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 g ki (t) which are used for the preparation of the signals S .
  • the invention includes, apart from these arrangements main, certain other provisions which preferably used at the same time and which will be more explicitly question below.
  • Figure 1 of this drawing shows very schematically a room equipped with a device to protect outside noise a limited volume of this room.
  • Figure 2 is a diagram of the electronic circuit understood by this device.
  • the noises E are for example those which come from from outside the room through an open window 5 or closed.
  • Volume 2 presents for example the form of a sphere or 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 we want to isolate noise E, this person being by example sitting in front of a desk or lying in a bed.
  • the present invention proposes to solve the problem of attenuation, even deletion, of unwanted noise in volume 2 above defined, and even if these noises are random and if they are reflected or reverberated by the walls 4 of room 3.
  • volume 2 to be acoustically protected Interpose between volume 2 to be acoustically protected and the source of the noise E towards which we wishes to ensure said protection two "barriers" or “drums” 6 and 8 each made up of acoustic elements distinct kept separate from each other by a rigid frame (respectively 7.9) openwork opposite sounds.
  • the first 6 of these two batteries defines a reticulated network, generally three-dimensional, of points or distinct "nodes" i-1, i, i + 1 ... occupying at least in part of 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 i .
  • 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.
  • Each of the sources 10 i of the battery 6 is then replaced by acoustic sensors 12 i 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 g ki (t) corresponding to the noise which is generated on the sensor 12 i is then determined by the emission of a short acoustic pulse from the source 15 k .
  • each function g ki (t) is strictly identical to the reciprocal function g ik (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 corresponding reverse wavefront to these counter signals successively occupies the various positions that the front occupied in the past initial "direct” wave, the observed phenomenon being comparable to the projection of a cinematographic film at 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 clears 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.
  • the range of frequencies to which are sensitive the sensors is advantageously between 10 Hz and 10,000 Hz.
  • the sampling frequency is equal at 80 kHz, which corresponds to a sampling carried out every 12 microseconds.
  • these distances are advantageously given a value equal to half of the longest wavelength small of the affected frequency range.
  • the distance in question can be of the order of 10 centimeters, which provides protection especially good acoustics compared to the components of low frequency of noises to be neutralized: the length wave is indeed 33 centimeters for a frequency 1000 Hz.
  • this number is equal to several tens, being in particular of the order from 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 includes 2,080x15,000 bytes, i.e. 31.20 megabytes, which represents quite a reasonable number.
  • This device presents compared to those previously known many advantages and in particular that of ensuring acoustic protection even vis-à-vis random noises and even if the volume considered is arranged inside a room whose walls are not specially treated to oppose reflections acoustic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (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)
  • Buffer Packaging (AREA)
  • Braking Arrangements (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Tires In General (AREA)
  • Secondary Cells (AREA)
  • Fuses (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Casings For Electric Apparatus (AREA)
  • Materials For Medical Uses (AREA)
  • Fluid-Damping Devices (AREA)
  • Transmitters (AREA)
EP93402974A 1992-12-11 1993-12-09 Perfectionnements aux procédés et dispositifs pour protéger des bruits extérieurs un volume donné, de préférence disposé à l'intérieur d'un local Expired - Lifetime EP0601934B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214952 1992-12-11
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.

Publications (2)

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

Family

ID=9436486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402974A Expired - Lifetime EP0601934B1 (fr) 1992-12-11 1993-12-09 Perfectionnements aux procédés et dispositifs pour protéger des bruits extérieurs un volume donné, de préférence disposé à l'intérieur d'un local

Country Status (19)

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

Families Citing this family (27)

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Publication number Priority date Publication date Assignee Title
WO1995026102A1 (en) * 1994-03-24 1995-09-28 Philips Electronics N.V. Audio-visual arrangement and system in which such an arrangement is used
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
FR2732807B1 (fr) * 1995-04-04 1997-05-16 Technofirst Procede et dispositif personnels d'attenuation acoustique active, siege equipe du dispositif correspondant, et espace a attenuation acoustique active obtenu
DE69638347D1 (de) * 1995-07-13 2011-05-12 Applic Du Retournement Temporel Soc Pour Verfahren und Anordnung zur Fokussierung akustischer Welle
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
US5699437A (en) * 1995-08-29 1997-12-16 United Technologies Corporation Active noise control system using phased-array sensors
FR2771541B1 (fr) * 1997-11-21 2000-10-20 Jean Claude Decaux Procede et dispositif d'insonorisation active
ATE376892T1 (de) 1999-09-29 2007-11-15 1 Ltd Verfahren und vorrichtung zur ausrichtung von schall mit einer gruppe von emissionswandlern
FR2799873B1 (fr) * 1999-10-18 2002-02-08 Comptoir De La Technologie Dispositif actif d'attenuation de l'intensite sonore
GB2376595B (en) * 2001-03-27 2003-12-24 1 Ltd Method and apparatus to create a sound field
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
US10304473B2 (en) 2017-03-15 2019-05-28 Guardian Glass, LLC Speech privacy system and/or associated method
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
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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US5233540A (en) * 1990-08-30 1993-08-03 The Boeing Company Method and apparatus for actively reducing repetitive vibrations
JPH0739968B2 (ja) * 1991-03-25 1995-05-01 日本電信電話株式会社 音響伝達特性模擬方法
US5216721A (en) * 1991-04-25 1993-06-01 Nelson Industries, Inc. Multi-channel active acoustic attenuation system
US5224168A (en) * 1991-05-08 1993-06-29 Sri International Method and apparatus for the active reduction of compression waves
US5216722A (en) * 1991-11-15 1993-06-01 Nelson Industries, Inc. Multi-channel active attenuation system with error signal inputs

Also Published As

Publication number Publication date
TW293059B (zh) 1996-12-11
FR2699205A1 (fr) 1994-06-17
US5438624A (en) 1995-08-01
RU2132089C1 (ru) 1999-06-20
FI935515A (fi) 1994-06-12
AU5230293A (en) 1994-06-23
NO934511D0 (no) 1993-12-09
IL107919A0 (en) 1994-04-12
NO301086B1 (no) 1997-09-08
KR940015967A (ko) 1994-07-22
PL301416A1 (en) 1994-06-13
DE69320770T2 (de) 1999-05-06
KR100306270B1 (ko) 2001-11-30
NO934511L (no) 1994-06-13
CA2110763A1 (en) 1994-06-12
FI935515A0 (fi) 1993-12-09
DE69320770D1 (de) 1998-10-08
FR2699205B1 (fr) 1995-03-10
PL173598B1 (pl) 1998-03-31
CN1092128A (zh) 1994-09-14
JPH06236191A (ja) 1994-08-23
IL107919A (en) 1996-07-23
ES2123040T3 (es) 1999-01-01
BR9305018A (pt) 1994-06-14
DK0601934T3 (da) 1999-05-31
ATE170655T1 (de) 1998-09-15
EP0601934A1 (fr) 1994-06-15
AU669020B2 (en) 1996-05-23

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