EP0842508B1 - Procede et dispositif de focalisation d'ondes acoustiques - Google Patents

Procede et dispositif de focalisation d'ondes acoustiques Download PDF

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Publication number
EP0842508B1
EP0842508B1 EP96925774A EP96925774A EP0842508B1 EP 0842508 B1 EP0842508 B1 EP 0842508B1 EP 96925774 A EP96925774 A EP 96925774A EP 96925774 A EP96925774 A EP 96925774A EP 0842508 B1 EP0842508 B1 EP 0842508B1
Authority
EP
European Patent Office
Prior art keywords
sound
signal
acoustic
loudspeakers
space
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
EP96925774A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0842508A1 (fr
Inventor
Mathias Fink
Jacques Lewiner
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.)
POUR LES APPLICATIONS DU RETOURNEMENT TEMPOREL Ste
Original Assignee
POUR LES APPLICATIONS DU RETOURNEMENT TEMPOREL Ste
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Application filed by POUR LES APPLICATIONS DU RETOURNEMENT TEMPOREL Ste filed Critical POUR LES APPLICATIONS DU RETOURNEMENT TEMPOREL Ste
Priority to EP99111417A priority Critical patent/EP0944035B1/fr
Publication of EP0842508A1 publication Critical patent/EP0842508A1/fr
Application granted granted Critical
Publication of EP0842508B1 publication Critical patent/EP0842508B1/fr
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems

Definitions

  • the present invention relates to methods and acoustic wave focusing devices.
  • the invention relates more particularly to a method for sounding a space disturbing the propagation of acoustic waves in order to transmit in this space information in the form of acoustic waves by means of a number n of loudspeakers, n being a natural integer at less equal to 1, this method comprising sound stages during which at least one acoustic signal S (t) carrying information is transmitted in at least one area, called “target area", which belongs to the space to be sounded , this transmission being carried out by causing acoustic signals s i (t) to be emitted by at least one subset of so-called "active" loudspeakers, which subset comprises at least one loudspeaker chosen from among the n loudspeakers mentioned above.
  • the object of the present invention is in particular to optimize the transmission of information inside such space.
  • this device also comprises means to select the target area within the space to sound.
  • the space to be sounded is a train station 101 equipped of a large number of n of speakers 102, n being a natural integer for example greater than 10.
  • speakers 102 are signaling audible, for example an information message for the attention travelers 103
  • the resulting sound waves reach travelers 103 with significant distortions which are due to the fact that these sound waves undergo multiple paths and therefore arrive so inconsistent in travelers' ears 103.
  • the information message, or any other sound signal from the speakers is often difficult for travelers to understand 103.
  • an acoustic "calibration" operation is first carried out on the station 101, by determining the impulse response h ij (t) between each loudspeaker i and each point j being part of a set of predetermined points 107 said to be "calibration" distributed inside the station 1.
  • the calibration points 107 are preferably located approximately at breast height, for example at a height between 1.50 m and 1.75 m above the ground, and they are distributed in the various parts of the station 101 which are frequented by travelers 103.
  • the impulse response h ij (t) corresponds to the acoustic signal received at point j when the loudspeaker i emits a short acoustic pulse (ideally a Dirac pulse) or vice versa to the acoustic signal received at the loudspeaker i when emits at point j a short acoustic pulse (the impulse response is the same in both directions of propagation).
  • impulse responses can therefore be measured relatively simply, preferably at night or at least at a time when station 101 is not receiving audience, having each speaker emit successively 102 a short acoustic pulse, and by measuring the acoustic signals received following this pulse at the various calibration points 107, using 108 microphones ( Figure 3) previously arranged at the points 107.
  • each speaker 102 receives successively from a computer 109 the impulse signal to be sent, the computer 109 being connected, for example by a connection in bus, to a plurality of digital-to-analog converters 110, each of these digital-to-analog converters being connected to a speaker 102 via an amplifier 111, and each of these converters digital-analog 110 being addressable and controlled independently by the computer 109, so that each speaker 102 can emit a signal independent of other speakers.
  • the various microphones 108 located at level of the calibration points 107 are each connected to a analog to digital converter 112 via an amplifier 113, the converters 112 can be for example addressable converters connected by bus to computer 109, so that the signals picked up by the microphones 108 can be memorized by the computer 109 for each calibration point 107.
  • the impulse responses h ij (t) thus memorized by the computer 109 are then time inverted by this computer, which finally stores the time inversions of the impulse responses h ij (-t).
  • the sound signal S (t) is broadcast at by means of the computer 109, which receives the signal S (t) by through at least one entry route 117 comprising for example a microphone 118 or another source sending the signal S (t) to the computer, an amplifier 119 and a analog-to-digital converter 120.
  • the computer 109 is also connected to a interface 121 comprising for example a keyboard and a screen which allows an operator to choose the target area 114, 115 in which he wishes to broadcast a message or other audible signal.
  • a interface 121 comprising for example a keyboard and a screen which allows an operator to choose the target area 114, 115 in which he wishes to broadcast a message or other audible signal.
  • this message S (t) is received by the computer 109 , which calculates the signals s i (t) to be transmitted by each speaker 102 and transmits these signals to the corresponding speakers 102 via digital-analog converters 110 and amplifiers 111.
  • the signals s i (t) emitted only by some of the loudspeakers of the station 101, called active speakers, for example the loudspeakers closest to the target area.
  • each active loudspeaker that is to say in general each loudspeaker of the station 101, emits an acoustic signal
  • the method according to the invention can also be used to send a message particularly clear and possibly particularly strong at a given individual 122 ( Figure 2) or to a given group of individuals.
  • it may be a service message intended for a particular employee, or a message deterrent to an individual committing a offense or recklessness.
  • the operator identifies the position of individual 122 or the group of individuals receiving the message, this identification can be carried out by vision direct or indirectly by viewing one or more control screens linked to one or more cameras monitoring.
  • the operator indicates the position of the individual 122 to the computer 109 via interface 121, after which the computer 109 automatically determines a target area 123 of size collapsed, containing individual 122 and at least one dot calibration 107, then the operator broadcasts to the individual 122 his dissuasive message.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Surgical Instruments (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
EP96925774A 1995-07-13 1996-07-11 Procede et dispositif de focalisation d'ondes acoustiques Expired - Lifetime EP0842508B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99111417A EP0944035B1 (fr) 1995-07-13 1996-07-11 Procédé et dispositif de focalisation d'ondes acoustiques

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9508543 1995-07-13
FR9508543 1995-07-13
PCT/FR1996/001083 WO1997003438A1 (fr) 1995-07-13 1996-07-11 Procede et dispositif de focalisation d'ondes acoustiques

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP99111417A Division EP0944035B1 (fr) 1995-07-13 1996-07-11 Procédé et dispositif de focalisation d'ondes acoustiques

Publications (2)

Publication Number Publication Date
EP0842508A1 EP0842508A1 (fr) 1998-05-20
EP0842508B1 true EP0842508B1 (fr) 2000-01-12

Family

ID=9480993

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99111417A Expired - Lifetime EP0944035B1 (fr) 1995-07-13 1996-07-11 Procédé et dispositif de focalisation d'ondes acoustiques
EP96925774A Expired - Lifetime EP0842508B1 (fr) 1995-07-13 1996-07-11 Procede et dispositif de focalisation d'ondes acoustiques

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99111417A Expired - Lifetime EP0944035B1 (fr) 1995-07-13 1996-07-11 Procédé et dispositif de focalisation d'ondes acoustiques

Country Status (5)

Country Link
US (2) US6198829B1 (ja)
EP (2) EP0944035B1 (ja)
JP (1) JP3675836B2 (ja)
DE (2) DE69638347D1 (ja)
WO (1) WO1997003438A1 (ja)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69638347D1 (de) * 1995-07-13 2011-05-12 Applic Du Retournement Temporel Soc Pour Verfahren und Anordnung zur Fokussierung akustischer Welle
FR2815717B1 (fr) * 2000-10-20 2003-01-10 Centre Nat Rech Scient Procede et dispositif non invasif de focalisation d'ondes acoustiques
FR2830468B1 (fr) * 2001-10-04 2004-02-20 Inst Nat Sante Rech Med Dispositif et procede de production d'impulsions ultrasonores de forte pression
FR2840418B1 (fr) * 2002-06-04 2004-08-20 Centre Nat Rech Scient Procede pour generer un champ d'ondes predetermine
US20040059265A1 (en) * 2002-09-12 2004-03-25 The Regents Of The University Of California Dynamic acoustic focusing utilizing time reversal
FR2858099B1 (fr) 2003-07-25 2006-03-24 Centre Nat Rech Scient Procede et dispositif de focalisation d'ondes acoustiques
WO2005106842A2 (en) * 2004-04-16 2005-11-10 Raytheon Company Method and system for swimmer denial
FI20060910A0 (fi) * 2006-03-28 2006-10-13 Genelec Oy Tunnistusmenetelmä ja -laitteisto äänentoistojärjestelmässä
FR2912817B1 (fr) * 2007-02-21 2009-05-22 Super Sonic Imagine Sa Procede d'optimisation de la focalisation d'ondes au travers d'un element introducteur d'aberations.
US7613076B2 (en) * 2007-05-31 2009-11-03 Avago Technologies Wireless Ip (Singapore) Pte. Ltd. Acoustic power transformer including lens
EP2315458A3 (en) * 2008-04-09 2012-09-12 Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V. Apparatus and method for generating filter characteristics
TW201026009A (en) * 2008-12-30 2010-07-01 Ind Tech Res Inst An electrical apparatus, circuit for receiving audio and method for filtering noise
FR2977671B1 (fr) * 2011-07-08 2013-11-29 01Db Metravib Procede et dispositif pour controler des structures par retournement temporel
FR2991807B1 (fr) * 2012-06-06 2014-08-29 Centre Nat Rech Scient Dispositif et procede de focalisation d'impulsions
FR2991791B1 (fr) 2012-06-06 2014-08-08 Commissariat Energie Atomique Interface de stimulation tactile par retournement temporel
FR3076941B1 (fr) * 2018-01-12 2021-06-04 Valeo Systemes Dessuyage Procede de calibration pour systeme de focalisation acoustique
FR3076940B1 (fr) * 2018-01-12 2021-04-16 Valeo Systemes Dessuyage Procede d'emission sonore focalisee et systeme de focalisation acoustique

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FR2334953A1 (fr) * 1975-12-11 1977-07-08 Labo Electronique Physique Systeme d'analyse par ultrasons et son application a l'echographie
US4882714A (en) * 1984-02-07 1989-11-21 Nec Corporation Object detecting system using ultrasonic waves
FR2642640B1 (fr) * 1989-02-08 1991-05-10 Centre Nat Rech Scient Procede et dispositif de focalisation d'ultrasons dans les tissus
US5267320A (en) * 1991-03-12 1993-11-30 Ricoh Company, Ltd. Noise controller which noise-controls movable point
FR2683323B1 (fr) 1991-11-05 1994-02-11 Paris Vii Universite Procede et dispositif de controle interne de pieces par ultrasons.
FR2696573B1 (fr) * 1992-10-02 1996-08-30 Univ Paris Procede et dispositif d'examen acoustique a retournement temporel.
FR2699205B1 (fr) * 1992-12-11 1995-03-10 Decaux Jean Claude Perfectionnements aux procédés et dispositifs pour protéger des bruits extérieurs un volume donné, de préférence disposé à l'intérieur d'un local.
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FR2726115B1 (fr) * 1994-10-20 1996-12-06 Comptoir De La Technologie Dispositif actif d'attenuation de l'intensite sonore
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DE69638347D1 (de) * 1995-07-13 2011-05-12 Applic Du Retournement Temporel Soc Pour Verfahren und Anordnung zur Fokussierung akustischer Welle
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FR2749938B1 (fr) * 1996-06-13 1998-08-28 Fink Mathias Procede et dispositif de detection et de localisation de source sonore reflechissante
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Also Published As

Publication number Publication date
EP0944035B1 (fr) 2011-03-30
EP0944035A2 (fr) 1999-09-22
DE69638347D1 (de) 2011-05-12
WO1997003438A1 (fr) 1997-01-30
US20010001603A1 (en) 2001-05-24
JP3675836B2 (ja) 2005-07-27
DE69606179T2 (de) 2000-08-17
US6198829B1 (en) 2001-03-06
DE69606179D1 (de) 2000-02-17
JP2000501896A (ja) 2000-02-15
EP0842508A1 (fr) 1998-05-20
EP0944035A3 (fr) 2001-04-18
US6978028B2 (en) 2005-12-20

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