EP0622777A1 - Vorrichtung zur Dämpfung der Energie akustischer Wellen, die von einer Tonquelle in mindestens eine vorbestimmte Richtung ausgesendet wurden - Google Patents

Vorrichtung zur Dämpfung der Energie akustischer Wellen, die von einer Tonquelle in mindestens eine vorbestimmte Richtung ausgesendet wurden Download PDF

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Publication number
EP0622777A1
EP0622777A1 EP94490011A EP94490011A EP0622777A1 EP 0622777 A1 EP0622777 A1 EP 0622777A1 EP 94490011 A EP94490011 A EP 94490011A EP 94490011 A EP94490011 A EP 94490011A EP 0622777 A1 EP0622777 A1 EP 0622777A1
Authority
EP
European Patent Office
Prior art keywords
hand
waves
loudspeaker
face
conduits
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Withdrawn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
EP94490011A
Other languages
English (en)
French (fr)
Inventor
Roland Lecompte
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
Publication of EP0622777A1 publication Critical patent/EP0622777A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2803—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means for loudspeaker transducers
    • 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
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • H04R1/347—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers for obtaining a phase-shift between the front and back acoustic wave
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/027—Electrical or mechanical reduction of yoke vibration

Definitions

  • the invention relates to a device for attenuating the energy of the acoustic waves emitted by a sound source in at least one determined direction.
  • the invention applies, more particularly but not exclusively, to the attenuation of the sound energy emitted by the rear face of the membrane of an ultrasonic transducer, such as a loudspeaker comprising a rigid structure which is open to the 'back.
  • loudspeaker will designate both an active transducer, that is to say provided with an excitation coil, and a passive transducer, that is to say without such a coil.
  • Another result which the invention aims to obtain is a device which makes it possible to increase the clarity of the sound message emitted by the loudspeaker.
  • the sound waves are emitted in at least one zone of the sound source 2.
  • the sound source 2 consists of a loudspeaker, that is to say, an assembly comprising a membrane 3 substantially frustoconical whose edge 4 of the largest base 5 is elastically connected to that 6 homologous to a part.
  • frustoconical 7 concave which, rigid and perforated, largely envelopes the rear 8, rear 8 and front 9 of said membrane 3 and carries to the right of its small base 10 a motor means 11 comprising a movable member 12 meanwhile connected to the small base 13 of the membrane 3.
  • the motor means 11 forms an approximately cylindrical projection at the rear of the loudspeaker.
  • the movable member 12 of the motor means 11 moves in a rectilinear direction approximately coincident with the longitudinal axis 14 of the membrane 3.
  • the application by motor means 11 of electrical signals generates the displacement of the membrane and the production of acoustic waves at each of the two front 9 and rear 8 faces of the membrane 3.
  • the means 18, 19 for selection and capture are oriented towards zones of the source 2 which produce sound waves generating variations in acoustic pressure of the same frequency, in phase and of the same amplitude and , on the other hand, the means 20 is positioned to collect the aforementioned waves and deflect them towards at least one point 21, called a confrontation point, by placing them in phase opposition.
  • the conduits 19A make it possible to guide the waves to points distant from this face 8 and obviate the return of a wave towards said rear face 8.
  • the device of the invention comprises, on the one hand, a plurality of pairs 19 of conduits 19A, in each of which the conduits are diametrically opposite with respect to an axis 14 passing approximately through the center of the source 2 and, on the other hand, a plurality of pairs of deflecting surfaces 20A associated with each of the pairs of conduits 19A.
  • the body 30 and the drive means 11 cooperate by means of a seal 41 which ensures continuity between their peripheral faces 29 and 11A.
  • the deflecting surfaces 20A each consist of one of the substantially planar and contiguous surfaces 20A which, in a way forming facets, form the internal face 32 of a ring 33 of substantially frustoconical envelope, which internal face 32 connects, by the internal one 34 of the edges of the largest of its bases, to the internal face 27 of the tubular wall 28.
  • the deflecting surfaces 20A are oriented relative to the direction "D" in which the device must produce its function so as to induce the confrontation of the waves picked up and guided by the conduits 19 at a point 21 which is located on an axis approximately coaxial with that longitudinal 14 of the diaphragm of the speaker 3.
  • the deflecting surfaces 20A are of such shape and extent that, taking into account their orientation relative to the direction "D" in which the device 1 must produce the desired attenuation, the projection of each of them in a plane orthogonal to the longitudinal axis of the tubular wall is at least inscribed in the cross section of a conduit 19A.
  • the body 30, the peripheral face 29 of which is connected to that of the means 11 loudspeaker motor 3, has a face 35 which lies approximately in a plane passing through the internal edge 34 of the largest of the bases of the crown 33 which carries.
  • the deflecting surfaces 20A and, on the other hand, the smallest of the bases of the abovementioned crown comprises an orifice 36.
  • the body 30 associated with the motor means 11 of the loudspeaker is substantially frustoconical and, on the one hand, the diameter of its largest base is approximately equal to the product of the half square root of two by the internal diameter of the tubular wall 28 while, on the other hand, its height is substantially equal to the external diameter of the motor means 11.
  • the frustoconical body 30 is hollow and the cavity which it comprises is filled with acoustically absorbent material.
  • the device of the invention equips a loudspeaker used in the construction of an acoustic enclosure, it advantageously allows at least part of the acoustic waves which are refracted in the enclosure, cannot return to the rear 8 of the membrane 3
  • the deflecting surfaces 20A and the partitions 31 are angularly arranged around the longitudinal axis of the tubular wall 28, so that the projection of the cross section of each partition 31 is located approximately on an axis of symmetry d 'a deflecting surface 20A.
  • the determination of the thickness of the partitions 31 is within the reach of those skilled in the art.
  • the device of the invention can be easily manufactured by molding numerous materials as diverse as plastics, metals, compressed rigid foams, rubber, molded organic fibers, etc.
  • the invention can also be applied in fields other than that of loudspeakers.
  • a device according to the invention can be integrated into a grid 37 for ventilating a room (not shown).
  • FIGS. 5 and 6 one sees such a grid 37 placed in a cutout 38 of a partition 39.
  • FIG. 7 we see another type of application in which the device according to the invention achieves sound attenuation at the level of an electric motor 40.
  • the device attenuates the sound flux coming from the source which constitutes the engine, without impeding the circulation of air through the latter.
  • the device according to the invention can be used to attenuate the sound level of gas passing through a duct, for example, an exhaust manifold duct of an internal combustion engine.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP94490011A 1993-04-27 1994-03-25 Vorrichtung zur Dämpfung der Energie akustischer Wellen, die von einer Tonquelle in mindestens eine vorbestimmte Richtung ausgesendet wurden Withdrawn EP0622777A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305190A FR2704675B1 (fr) 1993-04-27 1993-04-27 Dispositif d'atténuation de l'énergie des ondes acoustiques émise par une source sonore dans au moins une direction déterminée.
FR9305190 1993-04-27

Publications (1)

Publication Number Publication Date
EP0622777A1 true EP0622777A1 (de) 1994-11-02

Family

ID=9446651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94490011A Withdrawn EP0622777A1 (de) 1993-04-27 1994-03-25 Vorrichtung zur Dämpfung der Energie akustischer Wellen, die von einer Tonquelle in mindestens eine vorbestimmte Richtung ausgesendet wurden

Country Status (2)

Country Link
EP (1) EP0622777A1 (de)
FR (1) FR2704675B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2391739A (en) * 2002-08-09 2004-02-11 Indrek Hilpus Speaker enclosure attenuates rear waves through destructive interference of the divided and then recombined wavefront
WO2016156697A1 (fr) * 2015-04-02 2016-10-06 Focal Jmlab Dispositif d'adaptation d'impédance acoustique et haut-parleur équipe d'un tel dispositif
CN111223254A (zh) * 2018-11-23 2020-06-02 无锡科晟光子科技有限公司 一种精准性高的声音报警传感器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293181A (en) * 1940-07-17 1942-08-18 Int Standard Electric Corp Sound absorbing apparatus
US4750585A (en) * 1987-06-03 1988-06-14 Collings Boyd E Loudspeaker enclosure for suppressing unwanted audio waves
FR2674092A3 (fr) * 1991-03-15 1992-09-18 Focal Sa Haut-parleur perfectionne.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293181A (en) * 1940-07-17 1942-08-18 Int Standard Electric Corp Sound absorbing apparatus
US4750585A (en) * 1987-06-03 1988-06-14 Collings Boyd E Loudspeaker enclosure for suppressing unwanted audio waves
FR2674092A3 (fr) * 1991-03-15 1992-09-18 Focal Sa Haut-parleur perfectionne.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2391739A (en) * 2002-08-09 2004-02-11 Indrek Hilpus Speaker enclosure attenuates rear waves through destructive interference of the divided and then recombined wavefront
WO2016156697A1 (fr) * 2015-04-02 2016-10-06 Focal Jmlab Dispositif d'adaptation d'impédance acoustique et haut-parleur équipe d'un tel dispositif
FR3034564A1 (fr) * 2015-04-02 2016-10-07 Focal Jmlab Dispositif d'adaptation d'impedance acoustique et haut-parleur equipe d'un tel dispositif
US10306353B2 (en) 2015-04-02 2019-05-28 Focal Jmlab Acoustic impedance matching device and loudspeaker provided with such a device
CN111223254A (zh) * 2018-11-23 2020-06-02 无锡科晟光子科技有限公司 一种精准性高的声音报警传感器
CN111223254B (zh) * 2018-11-23 2022-04-19 无锡科晟光子科技有限公司 一种精准性高的声音报警传感器

Also Published As

Publication number Publication date
FR2704675A1 (fr) 1994-11-04
FR2704675B1 (fr) 1995-07-07

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