EP0618564A1 - Verfahren zur aktiven Steuerung des von einem Gerät erzeugten Lärms und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zur aktiven Steuerung des von einem Gerät erzeugten Lärms und Vorrichtung zur Durchführung des Verfahrens Download PDF

Info

Publication number
EP0618564A1
EP0618564A1 EP94400688A EP94400688A EP0618564A1 EP 0618564 A1 EP0618564 A1 EP 0618564A1 EP 94400688 A EP94400688 A EP 94400688A EP 94400688 A EP94400688 A EP 94400688A EP 0618564 A1 EP0618564 A1 EP 0618564A1
Authority
EP
European Patent Office
Prior art keywords
noise
source
noisy
counter
room
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Withdrawn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
EP94400688A
Other languages
English (en)
French (fr)
Inventor
Nathalie Cuny
Stephen Haentjens
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.)
Alstom Transport SA
Original Assignee
GEC Alsthom Transport SA
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 GEC Alsthom Transport SA filed Critical GEC Alsthom Transport SA
Publication of EP0618564A1 publication Critical patent/EP0618564A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • G10K11/16—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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G10K2210/12821—Rolling noise; Wind and body noise
    • 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
    • G10K2210/128—Vehicles
    • G10K2210/1283—Trains, trams or the like
    • 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
    • G10K2210/321—Physical
    • G10K2210/3224—Passive absorbers

Definitions

  • the present invention relates to a method for active control of the noise produced by an apparatus. It also relates to a device for implementing this method.
  • the invention applies particularly well to the attenuation of the noises generated by the devices entering into the constitution of a train to reduce the rolling noise transmitted inside the vehicles.
  • the active noise control systems currently studied and even marketed for some consist to try to cancel the noise in the immediate vicinity of a person's ears or, if necessary, a few people.
  • Active noise control headphones have just been released. It makes it possible to superimpose, on the ears of the helmet wearer, an anti-noise signal with a surrounding noise.
  • Experiments are currently being carried out on small planes to reduce noise in the cabin. Acoustic sensors are used for this, roughly representing the ears of the passengers, and a relatively large number of speakers to generate an anti-noise signal in the cabin, this signal being superimposed on the surrounding noise.
  • the present invention provides a solution to these problems. It consists in using an active noise control process, not to cancel or reduce the noise in certain determined places of an occupied room, but to cancel or reduce the noise around the noise generating device in order to prevent its spread to the room in question. Since the noisy device generally occupies a limited space in relation to the room occupied, the noise canceling device then uses a reduced number of detectors and speakers.
  • the subject of the invention is therefore a method of active control of the noise transmitted in a room by a noisy source external to the room, consisting in capturing the noise produced by the noisy source and in electronically generating a counter-noise, that is to say -to say a noise in phase opposition with the noise of the source in order to cancel it, characterized in that the counter-noise is added to the source noise in an area located between the noisy source and the room to form a silent barrier present all along said zone and whose dimensions are those of said zone, so as to prevent the transmission of noise from source to the local.
  • the transducer means can be speakers directed towards the room.
  • the noisy source can be a component of a train. It can be a bogie located under the body of a railway vehicle. It may be a median bogie connecting two rail vehicles, the transducer means being arranged on the one hand on one of the two rail vehicles and on the other hand on the other rail vehicle.
  • a rail vehicle bogie will be chosen as the noisy source and the adjacent passenger compartment (or passenger compartments) as local.
  • the rolling noise of a train is transmitted, via the bogies, to the passenger compartments.
  • insulating panels are currently used arranged between bogies and compartments. These panels weigh relatively heavy (more than 30 kg / m2) and are between 10 and 15 cm thick.
  • the bogies can be connected to rail vehicles in two different ways illustrated in Figures 1 and 2.
  • Each end of a railway vehicle can rest on its own bogie. This is the case for non-articulated train sets.
  • the ends of two adjacent railway vehicles 1, 2 rest on bogies 3, 4 specific to each vehicle.
  • the transmission of the rolling noise coming from the bogies 3, 4 is stopped or greatly attenuated by the presence of silent barriers 5, 6 covering the bogies and separating them from the interior of the vehicles 1, 2.
  • Two adjacent ends of railway vehicles can rest on a common bogie. This is the case with articulated trains.
  • the adjacent ends of the vehicles 11 and 12 rest on a common bogie 13.
  • the adjacent ends of the vehicles 12 and 14 rest on a common bogie 15.
  • the transmission of rolling noise coming from bogies 13 and 15 is stopped or greatly attenuated by the presence of two silent barriers per bogie.
  • the silent barriers 16 and 17 oppose the propagation of the rolling noise coming from the bogie 13 and propagating towards the vehicles 11 and 12.
  • the silent barriers 18 and 19 oppose the propagation of the rolling noise coming bogie 15 and propagating towards vehicles 12 and 14.
  • Silent barriers oppose noise throughout the area between the noisy source and the room. Its dimensions are those of the area between the noisy source and the room.
  • the thickness of the acoustic barriers will depend on the problem dealt with, which is a function, for example, of the frequency range, of the extent of the source.
  • Silent barriers are present throughout the area. They therefore have dimensions corresponding to that of the wall.
  • the silent barriers have the function of fictitiously doubling the original wall.
  • the silent barrier may be equipped with control means (not shown), for example sensors. These control means are connected to the transducer means receiving the counter-noise signals and emitting the counter-noise.
  • FIGS 3 and 4 illustrate the application of the invention in the case of a two-level articulated train.
  • These figures show a bogie half 20 supporting the end of a vehicle 21.
  • a noise sensor 22 (or possibly several sensors) is placed near the bogie 20 constituting the noisy source.
  • This noise sensor delivers the detected signals to an on-board counter-noise generator which electronically produces counter-noise signals.
  • These signals are received by a set of transducers, loudspeakers 23 for FIG. 3, surrounding the part of the bogie 20 corresponding to the vehicle 21.
  • the loudspeakers emit the counter-noise in the direction of propagation of the rolling noise, that is to say towards the inhabited interior of the vehicle.
  • the loudspeakers 23 transmit a counter-noise which is equal to the rolling noise but in phase opposition, there is then at the level of the loudspeakers a silent barrier preventing the transmission of the source noise towards the interior of the vehicle.
  • the transducers consist of vibrating walls 24 surrounding the end of the bogie 20.
  • Noise control can therefore be of the aerial type by the use of loudspeakers. It can be of the integral type by the use of elements applied to the partitions adjacent to the bogie such as vibrating pots or piezoelectric elements which can be given the form of walls.
  • Active rolling noise control can be done according to known methods of active control, in open loop or closed loop.
  • the counter-noise generator 30 (see FIG. 5) can be made up of digital filters calculated by LMS algorithm (least squares method). It receives electrical signals representative of the rolling noise and transmitted by the sensor 22 and provides counter-noise signals in response to the speakers 23 (or to the other transducers used).
  • LMS algorithm least squares method
  • the invention can also be applied to the reduction of noise transmitted by other members, for example traction motors.
  • counter-noise generators can be used especially for low frequency noises. For the higher frequencies it is still necessary to interpose layers of insulating material. However, relatively thin layers are sufficient for these high noise frequencies.
  • the invention also makes it possible, if the silent barrier sufficiently envelopes the noisy source, to reduce the level of noise radiated outside the room concerned.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)
EP94400688A 1993-04-02 1994-03-30 Verfahren zur aktiven Steuerung des von einem Gerät erzeugten Lärms und Vorrichtung zur Durchführung des Verfahrens Withdrawn EP0618564A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9303905 1993-04-02
FR9303905A FR2703553B1 (fr) 1993-04-02 1993-04-02 Procédé de contrôle actif du bruit produit par un appareil et dispositif de mise en Óoeuvre du procédé.

Publications (1)

Publication Number Publication Date
EP0618564A1 true EP0618564A1 (de) 1994-10-05

Family

ID=9445686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400688A Withdrawn EP0618564A1 (de) 1993-04-02 1994-03-30 Verfahren zur aktiven Steuerung des von einem Gerät erzeugten Lärms und Vorrichtung zur Durchführung des Verfahrens

Country Status (4)

Country Link
EP (1) EP0618564A1 (de)
JP (1) JPH06308979A (de)
CA (1) CA2120409A1 (de)
FR (1) FR2703553B1 (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016048A1 (en) * 1995-10-20 1997-05-01 C.R.F. Societa' Consortile Per Azioni Sound reproduction system for vehicles
DE19824125C1 (de) * 1998-05-29 1999-09-16 Eras Entwicklung Und Realisati Verfahren und Schienenfahrzeug zur aktiven Unterdrückung von fahrwerksbedingten Schwingungsanregungen im Fahrgastraum von Schienenfahrzeugen
DE10049819A1 (de) * 2000-10-09 2002-04-18 Siemens Ag Drehgestell eines Triebfahrzeugs
US6490696B1 (en) 1999-12-15 2002-12-03 Electronics For Imaging, Inc. System and method for printer output regression testing using display lists
EP1693704A2 (de) 2005-02-02 2006-08-23 Fuji Photo Film Co., Ltd. Resistzusammensetzung und Verfahren zur Strukturformung damit
EP1700890A2 (de) 2005-03-08 2006-09-13 Fuji Photo Film Co., Ltd. Tintenzusammensetzung, Tintenstrahldruckverfahren, bedrucktes Material, Methode zur Herstellung einer planograohischen Druckplatte, planographische Druckplatte
EP1757635A1 (de) 2005-08-23 2007-02-28 Fuji Photo Film Co., Ltd. Härtbare modifizierte Oxetane und Tinten enthaltend diese
EP1762599A1 (de) 2005-09-07 2007-03-14 FUJIFILM Corporation Tintenzusammensetzung, Tintenstrahldruckverfahren, bedrucktes Material, Methode zur Herstellung einer lithographischen Druckplatte, lithographische Druckplatte
EP1829684A1 (de) 2006-03-03 2007-09-05 FUJIFILM Corporation Härtbare Zusammensetzung, Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren und Flachdruckplatte
EP1952982A1 (de) 2007-02-02 2008-08-06 FUJIFILM Corporation Strahlungshärtbare polymerisierbare Zusammensetzung, Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren, gedruckte Materialien, Flachdruckplatte und Verfahren zur Herstellung einer Flachdruckplatte
EP1964894A2 (de) 2007-02-27 2008-09-03 FUJIFILM Corporation Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren, Drucksachen, Verfahren zur Herstellung einer Flachdruckplatte und Flachdruckplatte
EP1975212A2 (de) 2007-03-30 2008-10-01 FUJIFILM Corporation Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren, Drucksachen, Flachdruckplatte und Verfahren zur Herstellung einer Flachdruckplatte
EP2042570A1 (de) 2007-09-27 2009-04-01 FUJIFILM Corporation Lichthärtbare Zusammensetzung mit polymerisierbarem Verbundstoff, Polymerisierungsinitiator und Farbstoff
EP2065449A2 (de) 2007-11-29 2009-06-03 FUJIFILM Corporation Tintenzusammensetzung zur Tintenstrahlaufzeichnung, Tintenstrahlaufzeichnungsverfahren und gedrucktes Material
EP2103639A1 (de) 2005-11-04 2009-09-23 Fujifilm Corporation Härtbare polyzyklische Epoxidzusammensetzung, Tinte und Tintenstrahldruckverfahren damit
EP2166049A1 (de) 2008-09-19 2010-03-24 Fujifilm Corporation Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren und Herstellungsverfahren für einen druckgeformten Artikel
EP2169018A2 (de) 2008-09-26 2010-03-31 Fujifilm Corporation Tintenzusammensetzung und Tintenaufzeichnungsverfahren
EP2169022A1 (de) 2008-09-29 2010-03-31 Fujifilm Corporation Tintenzusammensetzung und Tintenaufzeichnungsverfahren
EP2278398A2 (de) 2002-05-31 2011-01-26 Fujifilm Corporation Positiv arbeitende Resistzusammensetzung
EP2477073A1 (de) 2002-02-13 2012-07-18 Fujifilm Corporation Resistzusammensetzung für einen Elektronen-, EUV- oder Röntgen-Strahlen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1494967A (fr) * 1966-08-04 1967-09-15 Centre Nat Rech Scient Procédé électroacoustique d'absorption des sons et bruits gênants dans des zonesétendues
WO1990010926A1 (de) * 1989-03-16 1990-09-20 Laukien Guenther Verfahren und vorrichtung zur verminderung der schallemission getauchter unterseeboote
GB2242098A (en) * 1990-03-12 1991-09-18 Toshiba Kk Refrigerating apparatus with a noise attenuating function
US5135079A (en) * 1990-02-28 1992-08-04 Kabushiki Kaisha Toshiba Noise prevention apparatus for a cable winch elevator
WO1992020063A1 (en) * 1991-05-08 1992-11-12 Sri International Method and apparatus for the active reduction of compression waves
GB2256111A (en) * 1991-04-11 1992-11-25 Univ Southampton Distributed sensors for active vibration control
GB2257601A (en) * 1991-07-09 1993-01-13 Honda Motor Co Ltd Active vibration control system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1494967A (fr) * 1966-08-04 1967-09-15 Centre Nat Rech Scient Procédé électroacoustique d'absorption des sons et bruits gênants dans des zonesétendues
WO1990010926A1 (de) * 1989-03-16 1990-09-20 Laukien Guenther Verfahren und vorrichtung zur verminderung der schallemission getauchter unterseeboote
US5135079A (en) * 1990-02-28 1992-08-04 Kabushiki Kaisha Toshiba Noise prevention apparatus for a cable winch elevator
GB2242098A (en) * 1990-03-12 1991-09-18 Toshiba Kk Refrigerating apparatus with a noise attenuating function
GB2256111A (en) * 1991-04-11 1992-11-25 Univ Southampton Distributed sensors for active vibration control
WO1992020063A1 (en) * 1991-05-08 1992-11-12 Sri International Method and apparatus for the active reduction of compression waves
GB2257601A (en) * 1991-07-09 1993-01-13 Honda Motor Co Ltd Active vibration control system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
D. FÖLLER: "Antischall-Chancen und Grenzen", ATZ AUTOMOBILTECHNISCHE ZEITSCHRIFT, vol. 94, no. 2, February 1992 (1992-02-01), STUTTGART DE, pages 88 - 93, XP000246531 *

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016048A1 (en) * 1995-10-20 1997-05-01 C.R.F. Societa' Consortile Per Azioni Sound reproduction system for vehicles
DE19824125C1 (de) * 1998-05-29 1999-09-16 Eras Entwicklung Und Realisati Verfahren und Schienenfahrzeug zur aktiven Unterdrückung von fahrwerksbedingten Schwingungsanregungen im Fahrgastraum von Schienenfahrzeugen
US6490696B1 (en) 1999-12-15 2002-12-03 Electronics For Imaging, Inc. System and method for printer output regression testing using display lists
DE10049819A1 (de) * 2000-10-09 2002-04-18 Siemens Ag Drehgestell eines Triebfahrzeugs
EP2477073A1 (de) 2002-02-13 2012-07-18 Fujifilm Corporation Resistzusammensetzung für einen Elektronen-, EUV- oder Röntgen-Strahlen
EP2278398A2 (de) 2002-05-31 2011-01-26 Fujifilm Corporation Positiv arbeitende Resistzusammensetzung
EP2278399A2 (de) 2002-05-31 2011-01-26 Fujifilm Corporation Positiv arbeitende Resistzusammensetzung
EP2278400A2 (de) 2002-05-31 2011-01-26 Fujifilm Corporation Positiv arbeitende Resistzusammensetzung
EP1693704A2 (de) 2005-02-02 2006-08-23 Fuji Photo Film Co., Ltd. Resistzusammensetzung und Verfahren zur Strukturformung damit
EP1700890A2 (de) 2005-03-08 2006-09-13 Fuji Photo Film Co., Ltd. Tintenzusammensetzung, Tintenstrahldruckverfahren, bedrucktes Material, Methode zur Herstellung einer planograohischen Druckplatte, planographische Druckplatte
EP1757635A1 (de) 2005-08-23 2007-02-28 Fuji Photo Film Co., Ltd. Härtbare modifizierte Oxetane und Tinten enthaltend diese
EP1762599A1 (de) 2005-09-07 2007-03-14 FUJIFILM Corporation Tintenzusammensetzung, Tintenstrahldruckverfahren, bedrucktes Material, Methode zur Herstellung einer lithographischen Druckplatte, lithographische Druckplatte
EP2103639A1 (de) 2005-11-04 2009-09-23 Fujifilm Corporation Härtbare polyzyklische Epoxidzusammensetzung, Tinte und Tintenstrahldruckverfahren damit
EP1829684A1 (de) 2006-03-03 2007-09-05 FUJIFILM Corporation Härtbare Zusammensetzung, Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren und Flachdruckplatte
EP1952982A1 (de) 2007-02-02 2008-08-06 FUJIFILM Corporation Strahlungshärtbare polymerisierbare Zusammensetzung, Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren, gedruckte Materialien, Flachdruckplatte und Verfahren zur Herstellung einer Flachdruckplatte
EP1964894A2 (de) 2007-02-27 2008-09-03 FUJIFILM Corporation Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren, Drucksachen, Verfahren zur Herstellung einer Flachdruckplatte und Flachdruckplatte
EP1975212A2 (de) 2007-03-30 2008-10-01 FUJIFILM Corporation Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren, Drucksachen, Flachdruckplatte und Verfahren zur Herstellung einer Flachdruckplatte
EP2042570A1 (de) 2007-09-27 2009-04-01 FUJIFILM Corporation Lichthärtbare Zusammensetzung mit polymerisierbarem Verbundstoff, Polymerisierungsinitiator und Farbstoff
EP2065449A2 (de) 2007-11-29 2009-06-03 FUJIFILM Corporation Tintenzusammensetzung zur Tintenstrahlaufzeichnung, Tintenstrahlaufzeichnungsverfahren und gedrucktes Material
EP2166049A1 (de) 2008-09-19 2010-03-24 Fujifilm Corporation Tintenzusammensetzung, Tintenstrahlaufzeichnungsverfahren und Herstellungsverfahren für einen druckgeformten Artikel
EP2169018A2 (de) 2008-09-26 2010-03-31 Fujifilm Corporation Tintenzusammensetzung und Tintenaufzeichnungsverfahren
EP2169022A1 (de) 2008-09-29 2010-03-31 Fujifilm Corporation Tintenzusammensetzung und Tintenaufzeichnungsverfahren

Also Published As

Publication number Publication date
CA2120409A1 (fr) 1994-10-03
FR2703553A1 (fr) 1994-10-07
JPH06308979A (ja) 1994-11-04
FR2703553B1 (fr) 1995-05-12

Similar Documents

Publication Publication Date Title
EP0618564A1 (de) Verfahren zur aktiven Steuerung des von einem Gerät erzeugten Lärms und Vorrichtung zur Durchführung des Verfahrens
US8565442B2 (en) Noise reduction device
US9462370B2 (en) Muting device
JPH0519160B2 (de)
Zhu et al. Active control of acoustic reflection, absorption, and transmission using thin panel speakers
US20030228019A1 (en) Method and system for reducing noise
JP2010188752A (ja) 騒音低減装置
WO1996031872A1 (fr) Procede et dispositif personnels d'attenuation acoustique active a reponse impulsionelle invariante
FR2704969A1 (fr) Dispositif d'atténuation acoustique à double paroi active.
EP3627492A1 (de) Rauschunterdrückungsvorrichtung, rauschunterdrückungssystem und schallfeldregelungsverfahren
JPWO2009078146A1 (ja) 騒音低減装置および騒音低減システム
EP0710946A1 (de) Doppelwandige Anordnung zur aktiven Schallunterdrückung
US20150358727A1 (en) Active buffeting control in an automobile
US20170278504A1 (en) Actively controlled quiet headspace
Rafaely et al. Combined feedback–feedforward active noise-reducing headset—The effect of the acoustics on broadband performance
JP2001245375A (ja) マイクロホン
JP4881896B2 (ja) ノイズキャンセル装置、ノイズキャンセル方法
Pan et al. Active noise control in workplaces
Zhu et al. Active control of glass panels for reduction of sound transmission through windows
JPH0511780A (ja) スピーチプライバシー保護装置
EP0539939B1 (de) Aktives Lärmunterdrückungssystem
JP2010083267A (ja) 騒音低減装置
EP3371519A1 (de) Mit einem schalldämpfer ausgestattete einheit zur natürlichen belüftung eines raumes
JP3311110B2 (ja) クロストーク音制御装置
JP7384272B2 (ja) 音響システム

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE FR IT SE

17P Request for examination filed

Effective date: 19950126

17Q First examination report despatched

Effective date: 19971119

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19980331