EP1017253A2 - Séparation aveugle de sources pour prothéses auditives - Google Patents

Séparation aveugle de sources pour prothéses auditives Download PDF

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Publication number
EP1017253A2
EP1017253A2 EP99310611A EP99310611A EP1017253A2 EP 1017253 A2 EP1017253 A2 EP 1017253A2 EP 99310611 A EP99310611 A EP 99310611A EP 99310611 A EP99310611 A EP 99310611A EP 1017253 A2 EP1017253 A2 EP 1017253A2
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EP
European Patent Office
Prior art keywords
signal
unmixing
input signals
microphones
common axis
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
EP99310611A
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German (de)
English (en)
Other versions
EP1017253A3 (fr
EP1017253B1 (fr
Inventor
Justinian Rosca
Christian Darken
Thomas Petsche
Inga Holube
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.)
Sivantos GmbH
Siemens Corp
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Siemens Corporate Research Inc
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Publication date
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Application filed by Siemens Corporate Research Inc filed Critical Siemens Corporate Research Inc
Publication of EP1017253A2 publication Critical patent/EP1017253A2/fr
Publication of EP1017253A3 publication Critical patent/EP1017253A3/fr
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Publication of EP1017253B1 publication Critical patent/EP1017253B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • H04R25/507—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing implemented by neural network or fuzzy logic

Definitions

  • the present invention generally relates to electronic filtering for enhancing a desired signal component of a mixed signal, and more specifically to a method and apparatus for real-time unmixing (separation or deconvolving) of a desired signal from a mixture of independent signals, particularly useful, for example, in a hearing aid.
  • noise When one is listening to someone or something, "noise" or undesired signals that interfere with the voice or desired signal, are ubiquitous. People with hearing impairment are especially vulnerable to noise. Background conversations, interference from digital devices (mobile telephones), car, or other specific environment noises, can make it very difficult for a hearing impaired person to understand a desired speech signal.
  • a reduction in the noise level of a signal, coupled with an automatic focus on a desired signal component, can significantly improve the performance of an electronic voice processor, such as one used in an advanced hearing aid.
  • hearing aids using digital signal processing have been introduced. They contain one or more microphones, analog to digital converters, digital signal processors, and speakers. Usually the digital signal processors divide the incoming signals into several frequency regions using filter banks. Within each of those regions, signal gain and dynamic compression parameters can be individually adjusted in accordance with the requirement for a particular user of the hearing aid, in an attempt to improve intelligibility. Additionally, digital signal processing algorithms for feedback reduction and noise reduction are available, however they have major limitations. For example, some of the disadvantages of the currently available algorithms for noise reduction are the limited improvement they obtain when speech and background noise are in the same frequency region, due to their inability to distinguish between speech and background noise.
  • BSS Blind Source Separation
  • An electronic filtering device for performing real-time unmixing of a signal desired to be recovered by a user of the device, where the desired signal emanates from one of a plurality of independent signal sources.
  • Two microphones positioned along a common axis develop first and second electrical input signals in response to reception by the microphones of acoustic signals from the plurality of independent signal sources.
  • the spatial position of the common axis of the microphones is controllable in real time by the user to align the common axis so it points in the direction of the source of the desired signal, thereby imparting an inherent directionality to the input signals.
  • An adaptive unmixing signal processor responsive to the input signals develops output signals wherein the desired signal is separated from the mixture signal.
  • a preprocessor is provided to enhance the inherent directionality of the input signals by establishing a relative time delay therebetween. Furthermore, the preprocessor may subject the enhanced input signals to a decorrelation processing before their application to the unmixing signal processor.
  • a selected output of the unmixing signal processor can be applied as an input to a speaker for reproduction, or can be further processed for signal enhancement by an additional processor before reproduction.
  • FIG. 1 illustrates in block diagram form an application of the invention for use in hearing aids.
  • a hearing aid 10 includes two microphones 12 and 14 for developing two input signals 1 and 2, respectively.
  • the microphones are mounted in the hearing aid such that a common axis of their positioning always extends substantially in the direction in which the wearer of the hearing aid looks when being attentive to a signal source such as a voice.
  • This microphone positioning imparts an inherent directionality to input signals 1 and 2. Since each microphone develops electrical signals representative of the acoustic waves received thereby from sound sources within it's operating range, each input signal may comprise a mixture of unknown signals from an unknown number of signal sources.
  • Input signals 1 and 2 are processed in three main stages.
  • the input signals are preprocessed for enhancing the inherent directionality already imparted thereto by their positioning.
  • the resulting signals are subjected to an unmixing processing (sometimes referred to as separation processing), which is designed to produce estimates of the original unknown signals picked-up by microphones 12 and 14.
  • the outputs of the unmixing processing are preferably postprocessed to produce the desired signal 22, which can then be applied to a speaker 24 of the hearing aid 10 for reproduction and presentation to a user.
  • preprocessing stage 16 begins with normalization of the raw input signals.
  • Automatic Gain Control is used to normalize input signals 1 and 2 to a [-1,+1] range.
  • preprocessing stage 16 in order to adapt a blind source separation (BSS) technique for use in a device as small as a hearing aid, and to have it operate in real-time, preprocessing stage 16 also provides at least the first, and preferably both of the following additional processing:
  • the window D comprised 16,000 samples.
  • the above described preprocessing facilitates the subsequent BSS processing to arrive at a solution in a shorter time than if the preprocessing was not provided, and furthermore, increases the probability that the BSS processing will arrive at a valid solution instead of a local minimum.
  • Figure 3 illustrates the principles of the operation of a BSS algorithm upon which the unmixing or separation of the desired component from the input signals is based.
  • the technique is called Blind Source Separation because it makes few assumptions about the type of signals present in the mixture.
  • BSS processing is intended to recover the set of n unknown source signals from a set of their mixtures, assuming that the n source signals are independent.
  • FIG. 4 illustrates a block diagram of the main components of a BSS processor 400.
  • BSS processor 400 comprises: an unmixing component 402 for recording and updating the state of the unmixing process defined by parameters W and v; a nonlinear component 404 for generating statistics used in the adaptation process; and an adaptation component 406 for computing changes in the values of the unmixing parameters, ⁇ W and ⁇ v.
  • the BSS processor 400 continuously adapts two state variables: the 2 by 2 unmixing matrix W, and the 2 by 1 bias vector b .
  • the nonlinear component 404 transforms the output of the system using an invertible mapping.
  • the objective of component 404 is to avoid processing very large numeric values of the outputs, which may be infinities from a computational point of view. This objective is carried out by processing statistically equivalent quantities, obtained after running the outputs z through the invertible mapping.
  • the adaptation component 406 determines changes in the unmixing parameters W and v: i.e., ⁇ W and ⁇ v.
  • the objective is to maximize the mutual information that the outputs y contain about the inputs x , as well known to those skilled in this technology, and as described, for example by A.J. Bell and T.J. Sejnowski in their article entitled "An information-maximization approach to blind separation and blind deconvolution" published in Neural Computation, 7:1129--1159, 1995, and as also described in Bell's US patent 5,706,402.
  • a typical value for the learning rate ⁇ is 0.005.
  • unmixer 18 is the postprocessing step 20, wherein a determination is made of which output estimate of unmixer 18 is more likely to represent voice rather than noise, as well as a normalization of the power of the outputs by scaling them to the level of the input powers.
  • the output signal section can be based on multiple criteria using, for example, voice specific feature extraction and analysis, and/or dominant speaker detection, which can also be accomplished using feature extraction and analysis.
  • the BSS processing is applied for use in hearing aids.
  • the inputs to the system are given by two microphones which, with the present invention, can be situated very close to one another.
  • the present invention addresses the following problems:
  • teaching of the present invention can be extremely useful for interference cancellation, separation of one voice from a mixture of many voices ("cocktail party" problem), and for preprocessing sound mixtures for noise reduction in order to allow further processing of a desired sound signal. x . All such changes, modifications, variations and other uses and applications which do not depart from the teachings herein are deemed to be covered by this patent, which is limited only by the claims which follow as interpreted in light of the foregoing description.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP99310611A 1998-12-30 1999-12-24 Séparation aveugle de sources pour prothèses auditives Revoked EP1017253B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22348598A 1998-12-30 1998-12-30
US223485 1998-12-30

Publications (3)

Publication Number Publication Date
EP1017253A2 true EP1017253A2 (fr) 2000-07-05
EP1017253A3 EP1017253A3 (fr) 2003-03-26
EP1017253B1 EP1017253B1 (fr) 2012-10-31

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ID=22836713

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EP99310611A Revoked EP1017253B1 (fr) 1998-12-30 1999-12-24 Séparation aveugle de sources pour prothèses auditives

Country Status (3)

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EP (1) EP1017253B1 (fr)
CN (1) CN1261759A (fr)
DK (1) DK1017253T3 (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1196009A2 (fr) * 2000-10-04 2002-04-10 TOPHOLM & WESTERMANN APS Prothèse auditive avec ajustement adaptatif des transducteurs d'entrée
WO2002030150A2 (fr) * 2000-10-04 2002-04-11 Widex A/S Prothese auditive avec adaptation des transducteurs d'entree
WO2003059010A1 (fr) * 2002-01-12 2003-07-17 Oticon A/S Appareil auditif insensible au bruit du vent
WO2004057914A1 (fr) * 2002-12-20 2004-07-08 Oticon A/S Systeme de microphone a reponse directionnelle
WO2005029914A1 (fr) * 2003-09-19 2005-03-31 Widex A/S Procede de commande de la directionnalite de la caracteristique de reception sonore d'une protese auditive et appareil de traitement d'un signal pour prothese auditive presentant une caracteristique directionnelle pouvant etre commandee
EP1530402A2 (fr) 2003-11-05 2005-05-11 Siemens Audiologische Technik GmbH Procédé pour l'adaptation d'une prothèse auditive en tenant compte de la position de la tête et prothèse auditive correspondente
EP1912472A1 (fr) * 2006-10-10 2008-04-16 Siemens Audiologische Technik GmbH Procédé pour le fonctionnement d'une prothèse auditive and prothèse auditive
EP1912474A1 (fr) 2006-10-10 2008-04-16 Siemens Audiologische Technik GmbH Procédé pour le fonctionnement d'une prothèse auditive et prothèse auditive
EP1912473A1 (fr) * 2006-10-10 2008-04-16 Siemens Audiologische Technik GmbH Traitement du signal d'entrée dans un appareil auditif
WO2008043731A1 (fr) 2006-10-10 2008-04-17 Siemens Audiologische Technik Gmbh Procédé de fonctionnement d'une aide auditive et aide auditive
DE102006047986A1 (de) * 2006-10-10 2008-04-24 Siemens Audiologische Technik Gmbh Verarbeitung eines Eingangssignals in einer Hörhilfe
JP2010506526A (ja) * 2006-10-10 2010-02-25 シーメンス アウディオローギッシェ テヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング 補聴器の動作方法、および補聴器
US7761291B2 (en) 2003-08-21 2010-07-20 Bernafon Ag Method for processing audio-signals
DE102009043775A1 (de) 2009-09-30 2011-04-07 Siemens Medical Instruments Pte. Ltd. Verfahren zum Einstellen einer Hörvorrichtung anhand eines emotionalen Zustandes und entsprechende Hörvorrichtung
US8139787B2 (en) 2005-09-09 2012-03-20 Simon Haykin Method and device for binaural signal enhancement
WO2012152625A1 (fr) 2011-05-06 2012-11-15 Rhein Chemie Rheinau Gmbh Nouveaux plastiques biosourcés durables, stables à l'hydrolyse, à base de polyhydroxyalcanoate (pha), procédé pour la fabrication desdits plastiques et utilisation de ces derniers
EP1744589B2 (fr) † 2005-07-11 2014-04-23 Siemens Audiologische Technik GmbH Appareil auditif et procédé correspondant pour la détection de voix-propres
EP2445230A4 (fr) * 2009-06-17 2016-05-18 Panasonic Ip Corp America Appareil auditif

Families Citing this family (10)

* Cited by examiner, † Cited by third party
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US7277554B2 (en) * 2001-08-08 2007-10-02 Gn Resound North America Corporation Dynamic range compression using digital frequency warping
US6711528B2 (en) * 2002-04-22 2004-03-23 Harris Corporation Blind source separation utilizing a spatial fourth order cumulant matrix pencil
US8767975B2 (en) 2007-06-21 2014-07-01 Bose Corporation Sound discrimination method and apparatus
US8611554B2 (en) 2008-04-22 2013-12-17 Bose Corporation Hearing assistance apparatus
US9078077B2 (en) 2010-10-21 2015-07-07 Bose Corporation Estimation of synthetic audio prototypes with frequency-based input signal decomposition
DE102016225207A1 (de) * 2016-12-15 2018-06-21 Sivantos Pte. Ltd. Verfahren zum Betrieb eines Hörgerätes
CN108597531B (zh) * 2018-03-28 2021-05-28 南京大学 一种通过多声源活动检测来改进双通道盲信号分离的方法
US11134350B2 (en) 2020-01-10 2021-09-28 Sonova Ag Dual wireless audio streams transmission allowing for spatial diversity or own voice pickup (OVPU)
US11083031B1 (en) 2020-01-10 2021-08-03 Sonova Ag Bluetooth audio exchange with transmission diversity
US11134349B1 (en) 2020-03-09 2021-09-28 International Business Machines Corporation Hearing assistance device with smart audio focus control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011533A1 (fr) * 1995-09-18 1997-03-27 Interval Research Corporation Dispositif de traitement de signaux acoustiques directionnels et procede correspondant
EP0848573A2 (fr) * 1996-12-11 1998-06-17 Micro Ear Technology, Inc. Prothèse auditive de type intra-auriculaire avec système de microphone directionnel
EP0883325A2 (fr) * 1997-06-02 1998-12-09 The University Of Melbourne Reseau de processeurs multi-strategie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011533A1 (fr) * 1995-09-18 1997-03-27 Interval Research Corporation Dispositif de traitement de signaux acoustiques directionnels et procede correspondant
EP0848573A2 (fr) * 1996-12-11 1998-06-17 Micro Ear Technology, Inc. Prothèse auditive de type intra-auriculaire avec système de microphone directionnel
EP0883325A2 (fr) * 1997-06-02 1998-12-09 The University Of Melbourne Reseau de processeurs multi-strategie

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002030150A2 (fr) * 2000-10-04 2002-04-11 Widex A/S Prothese auditive avec adaptation des transducteurs d'entree
EP1196009A3 (fr) * 2000-10-04 2003-01-02 Widex A/S Prothèse auditive avec ajustement adaptatif des transducteurs d'entrée
WO2002030150A3 (fr) * 2000-10-04 2003-02-27 Widex As Prothese auditive avec adaptation des transducteurs d'entree
US6741714B2 (en) 2000-10-04 2004-05-25 Widex A/S Hearing aid with adaptive matching of input transducers
EP1196009A2 (fr) * 2000-10-04 2002-04-10 TOPHOLM & WESTERMANN APS Prothèse auditive avec ajustement adaptatif des transducteurs d'entrée
US7181030B2 (en) 2002-01-12 2007-02-20 Oticon A/S Wind noise insensitive hearing aid
WO2003059010A1 (fr) * 2002-01-12 2003-07-17 Oticon A/S Appareil auditif insensible au bruit du vent
WO2004057914A1 (fr) * 2002-12-20 2004-07-08 Oticon A/S Systeme de microphone a reponse directionnelle
US7212642B2 (en) 2002-12-20 2007-05-01 Oticon A/S Microphone system with directional response
US7761291B2 (en) 2003-08-21 2010-07-20 Bernafon Ag Method for processing audio-signals
US7933423B2 (en) 2003-09-19 2011-04-26 Widex A/S Method for controlling the directionality of the sound receiving characteristic of a hearing aid and a signal processing apparatus
WO2005029914A1 (fr) * 2003-09-19 2005-03-31 Widex A/S Procede de commande de la directionnalite de la caracteristique de reception sonore d'une protese auditive et appareil de traitement d'un signal pour prothese auditive presentant une caracteristique directionnelle pouvant etre commandee
US8600086B2 (en) 2003-09-19 2013-12-03 Widex A/S Method for controlling the directionality of the sound receiving characteristic of a hearing aid and a signal processing apparatus
EP1530402A2 (fr) 2003-11-05 2005-05-11 Siemens Audiologische Technik GmbH Procédé pour l'adaptation d'une prothèse auditive en tenant compte de la position de la tête et prothèse auditive correspondente
DE10351509B4 (de) * 2003-11-05 2015-01-08 Siemens Audiologische Technik Gmbh Hörgerät und Verfahren zur Adaption eines Hörgeräts unter Berücksichtigung der Kopfposition
US7295676B2 (en) 2003-11-05 2007-11-13 Siemens Audiologische Technik Gmbh Hearing aid and method of adapting a hearing aid
EP1530402A3 (fr) * 2003-11-05 2007-10-17 Siemens Audiologische Technik GmbH Procédé pour l'adaptation d'une prothèse auditive en tenant compte de la position de la tête et prothèse auditive correspondente
DE10351509A1 (de) * 2003-11-05 2005-06-09 Siemens Audiologische Technik Gmbh Verfahren zur Adaption eines Hörgeräts unter Berücksichtigung der Kopfposition und entsprechendes Hörgerät
EP1744589B2 (fr) † 2005-07-11 2014-04-23 Siemens Audiologische Technik GmbH Appareil auditif et procédé correspondant pour la détection de voix-propres
US8139787B2 (en) 2005-09-09 2012-03-20 Simon Haykin Method and device for binaural signal enhancement
US8325957B2 (en) 2006-10-10 2012-12-04 Siemens Audiologische Technik Gmbh Hearing aid and method for operating a hearing aid
US8325954B2 (en) 2006-10-10 2012-12-04 Siemens Audiologische Technik Gmbh Processing an input signal in a hearing aid
US8194900B2 (en) 2006-10-10 2012-06-05 Siemens Audiologische Technik Gmbh Method for operating a hearing aid, and hearing aid
DE102006047983A1 (de) * 2006-10-10 2008-04-24 Siemens Audiologische Technik Gmbh Verarbeitung eines Eingangssignals in einem Hörgerät
US8199949B2 (en) 2006-10-10 2012-06-12 Siemens Audiologische Technik Gmbh Processing an input signal in a hearing aid
DE102006047986A1 (de) * 2006-10-10 2008-04-24 Siemens Audiologische Technik Gmbh Verarbeitung eines Eingangssignals in einer Hörhilfe
EP1912471A3 (fr) * 2006-10-10 2011-05-11 Siemens Audiologische Technik GmbH Traitement d'un signal d'entrée dans une prothése auditive
WO2008043731A1 (fr) 2006-10-10 2008-04-17 Siemens Audiologische Technik Gmbh Procédé de fonctionnement d'une aide auditive et aide auditive
JP2010506526A (ja) * 2006-10-10 2010-02-25 シーメンス アウディオローギッシェ テヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング 補聴器の動作方法、および補聴器
EP1912472A1 (fr) * 2006-10-10 2008-04-16 Siemens Audiologische Technik GmbH Procédé pour le fonctionnement d'une prothèse auditive and prothèse auditive
EP1912474A1 (fr) 2006-10-10 2008-04-16 Siemens Audiologische Technik GmbH Procédé pour le fonctionnement d'une prothèse auditive et prothèse auditive
DE102006047986B4 (de) * 2006-10-10 2012-06-14 Siemens Audiologische Technik Gmbh Verarbeitung eines Eingangssignals in einem Hörgerät
DE102006047982A1 (de) * 2006-10-10 2008-04-24 Siemens Audiologische Technik Gmbh Verfahren zum Betreiben einer Hörfilfe, sowie Hörhilfe
JP2010506525A (ja) * 2006-10-10 2010-02-25 シーメンス アウディオローギッシェ テヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング 補聴器の駆動方法および補聴器
US8331591B2 (en) 2006-10-10 2012-12-11 Siemens Audiologische Technik Gmbh Hearing aid and method for operating a hearing aid
EP1912473A1 (fr) * 2006-10-10 2008-04-16 Siemens Audiologische Technik GmbH Traitement du signal d'entrée dans un appareil auditif
EP2445230A4 (fr) * 2009-06-17 2016-05-18 Panasonic Ip Corp America Appareil auditif
DE102009043775A1 (de) 2009-09-30 2011-04-07 Siemens Medical Instruments Pte. Ltd. Verfahren zum Einstellen einer Hörvorrichtung anhand eines emotionalen Zustandes und entsprechende Hörvorrichtung
WO2012152625A1 (fr) 2011-05-06 2012-11-15 Rhein Chemie Rheinau Gmbh Nouveaux plastiques biosourcés durables, stables à l'hydrolyse, à base de polyhydroxyalcanoate (pha), procédé pour la fabrication desdits plastiques et utilisation de ces derniers

Also Published As

Publication number Publication date
EP1017253A3 (fr) 2003-03-26
EP1017253B1 (fr) 2012-10-31
DK1017253T3 (da) 2013-02-11
CN1261759A (zh) 2000-08-02

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