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FR2699205B1 - 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.

Info

Publication number
FR2699205B1
FR2699205B1 FR9214952A FR9214952A FR2699205B1 FR 2699205 B1 FR2699205 B1 FR 2699205B1 FR 9214952 A FR9214952 A FR 9214952A FR 9214952 A FR9214952 A FR 9214952A FR 2699205 B1 FR2699205 B1 FR 2699205B1
Authority
FR
France
Prior art keywords
sources
volume
room
located inside
protecting
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 - Fee Related
Application number
FR9214952A
Other languages
English (en)
Other versions
FR2699205A1 (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR9214952A priority Critical patent/FR2699205B1/fr
Priority to CA002110763A priority patent/CA2110763A1/fr
Priority to TW082110364A priority patent/TW293059B/zh
Priority to IL10791993A priority patent/IL107919A/en
Priority to ES93402974T priority patent/ES2123040T3/es
Priority to DK93402974T priority patent/DK0601934T3/da
Priority to US08/163,508 priority patent/US5438624A/en
Priority to AU52302/93A priority patent/AU669020B2/en
Priority to AT93402974T priority patent/ATE170655T1/de
Priority to DE69320770T priority patent/DE69320770T2/de
Priority to NO934511A priority patent/NO301086B1/no
Priority to FI935515A priority patent/FI935515A7/fi
Priority to EP93402974A priority patent/EP0601934B1/fr
Priority to NO934511D priority patent/NO934511D0/no
Priority to BR9305018A priority patent/BR9305018A/pt
Priority to RU93054520A priority patent/RU2132089C1/ru
Priority to PL93301416A priority patent/PL173598B1/pl
Priority to JP5345734A priority patent/JPH06236191A/ja
Priority to CN93121692A priority patent/CN1092128A/zh
Priority to KR1019930027354A priority patent/KR100306270B1/ko
Publication of FR2699205A1 publication Critical patent/FR2699205A1/fr
Application granted granted Critical
Publication of FR2699205B1 publication Critical patent/FR2699205B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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

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)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Casings For Electric Apparatus (AREA)
  • Buffer Packaging (AREA)
  • Transmitters (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Secondary Cells (AREA)
  • Fuses (AREA)
  • Materials For Medical Uses (AREA)
FR9214952A 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. Expired - Fee Related FR2699205B1 (fr)

Priority Applications (20)

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.
CA002110763A CA2110763A1 (fr) 1992-12-11 1993-12-06 Procedes servant a proteger contre les bruits exterieurs un volume donne, de preference dispose a l'interieur d'une piece, et dispositifs connexes
IL10791993A IL107919A (en) 1992-12-11 1993-12-07 Processes and devices for protecting a given volume from outside noises
TW082110364A TW293059B (fr) 1992-12-11 1993-12-07
FI935515A FI935515A7 (fi) 1992-12-11 1993-12-09 Parannuksia menetelmiin ja laitteisiin, joilla suojataan tietty tila, etenkin huoneen sisälle järjestetty tila, ulkopuoliselta melulta
US08/163,508 US5438624A (en) 1992-12-11 1993-12-09 Processes and devices for protecting a given volume, preferably arranged inside a room, from outside noises
AU52302/93A AU669020B2 (en) 1992-12-11 1993-12-09 Improvements to the processes and devices for protecting a given volume, preferably arranged inside a room, from outside noises
AT93402974T ATE170655T1 (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
DE69320770T DE69320770T2 (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
NO934511A NO301086B1 (no) 1992-12-11 1993-12-09 Fremgangsmåte og anordning for å beskytte et gitt volum, fortrinnsvis anordnet innenfor et rom, mot stöy fra utsiden
ES93402974T ES2123040T3 (es) 1992-12-11 1993-12-09 Perfeccionamientos en los procedimientos y dispositivos para proteger contra los ruidos exteriores un volumen determinado, preferentemente situado dentro de un local.
EP93402974A 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
NO934511D NO934511D0 (no) 1992-12-11 1993-12-09 Fremgangsmaate og anordning for aa beskytte et gitt volum, fortrinnsvis anordnet inne nfor et rom, mot underliggende stoey
DK93402974T DK0601934T3 (da) 1992-12-11 1993-12-09 Forbedringer ved fremgangsmåder og indretninger til at beskytte et givet rumfang, fortrinsvis anbragt inden i et lokale, mo
BR9305018A BR9305018A (pt) 1992-12-11 1993-12-10 Dispositivo para proteger dos ruidos externos um volume determinado, processo para determinar as respostas impulsionais, bateria reticulada e processo para a aplicaçao desse dispositivo.
RU93054520A RU2132089C1 (ru) 1992-12-11 1993-12-10 Устройство, способ и сетчатая батарея для защиты заданного объема от внешних шумов
PL93301416A PL173598B1 (pl) 1992-12-11 1993-12-10 Sposób i urządzenie do zabezpieczania przed szumami zewnętrznymi ograniczonej przestrzeni
JP5345734A JPH06236191A (ja) 1992-12-11 1993-12-10 所定の空間を外部の騒音から保護するための装置および方法
CN93121692A CN1092128A (zh) 1992-12-11 1993-12-11 防护某一给定的特别是设置在室内的空间免除外部噪声的改进方法和装置
KR1019930027354A KR100306270B1 (ko) 1992-12-11 1993-12-11 바람직하게는방의내부에배열된주어진특정공간을외부노이즈로부터보호하기위한방법및장치

Applications Claiming Priority (1)

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.

Publications (2)

Publication Number Publication Date
FR2699205A1 FR2699205A1 (fr) 1994-06-17
FR2699205B1 true FR2699205B1 (fr) 1995-03-10

Family

ID=9436486

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9214952A Expired - Fee Related 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.

Country Status (19)

Country Link
US (1) US5438624A (fr)
EP (1) EP0601934B1 (fr)
JP (1) JPH06236191A (fr)
KR (1) KR100306270B1 (fr)
CN (1) CN1092128A (fr)
AT (1) ATE170655T1 (fr)
AU (1) AU669020B2 (fr)
BR (1) BR9305018A (fr)
CA (1) CA2110763A1 (fr)
DE (1) DE69320770T2 (fr)
DK (1) DK0601934T3 (fr)
ES (1) ES2123040T3 (fr)
FI (1) FI935515A7 (fr)
FR (1) FR2699205B1 (fr)
IL (1) IL107919A (fr)
NO (2) NO934511D0 (fr)
PL (1) PL173598B1 (fr)
RU (1) RU2132089C1 (fr)
TW (1) TW293059B (fr)

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Publication number Priority date Publication date Assignee Title
JP3795915B2 (ja) * 1994-03-24 2006-07-12 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 音声−映像装置及びこのような装置が用いられたシステム
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
JP5306565B2 (ja) 1999-09-29 2013-10-02 ヤマハ株式会社 音響指向方法および装置
FR2799873B1 (fr) * 1999-10-18 2002-02-08 Comptoir De La Technologie Dispositif actif d'attenuation de l'intensite sonore
AU2002244845A1 (en) * 2001-03-27 2002-10-08 1... Limited 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
WO2006016156A1 (fr) * 2004-08-10 2006-02-16 1...Limited Batterie de transducteurs non-planaires
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
US10373626B2 (en) 2017-03-15 2019-08-06 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
US10304473B2 (en) 2017-03-15 2019-05-28 Guardian Glass, LLC Speech privacy system and/or associated method
CN110164409B (zh) * 2019-06-14 2024-12-13 江苏中车机电科技有限公司 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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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
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Also Published As

Publication number Publication date
ATE170655T1 (de) 1998-09-15
FR2699205A1 (fr) 1994-06-17
KR100306270B1 (ko) 2001-11-30
FI935515A7 (fi) 1994-06-12
IL107919A (en) 1996-07-23
ES2123040T3 (es) 1999-01-01
DK0601934T3 (da) 1999-05-31
NO301086B1 (no) 1997-09-08
NO934511D0 (no) 1993-12-09
TW293059B (fr) 1996-12-11
IL107919A0 (en) 1994-04-12
CN1092128A (zh) 1994-09-14
RU2132089C1 (ru) 1999-06-20
AU5230293A (en) 1994-06-23
AU669020B2 (en) 1996-05-23
DE69320770D1 (de) 1998-10-08
CA2110763A1 (fr) 1994-06-12
FI935515A0 (fi) 1993-12-09
EP0601934B1 (fr) 1998-09-02
NO934511L (no) 1994-06-13
BR9305018A (pt) 1994-06-14
US5438624A (en) 1995-08-01
JPH06236191A (ja) 1994-08-23
PL173598B1 (pl) 1998-03-31
EP0601934A1 (fr) 1994-06-15
DE69320770T2 (de) 1999-05-06
KR940015967A (ko) 1994-07-22
PL301416A1 (en) 1994-06-13

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