EP1041538B1 - Filtre mécanique pour systèmes acoustiques et téléviseur equipé de tels filtres - Google Patents

Filtre mécanique pour systèmes acoustiques et téléviseur equipé de tels filtres Download PDF

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Publication number
EP1041538B1
EP1041538B1 EP00201058A EP00201058A EP1041538B1 EP 1041538 B1 EP1041538 B1 EP 1041538B1 EP 00201058 A EP00201058 A EP 00201058A EP 00201058 A EP00201058 A EP 00201058A EP 1041538 B1 EP1041538 B1 EP 1041538B1
Authority
EP
European Patent Office
Prior art keywords
horn
acoustic
mechanical filter
flexible plate
rigid
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
EP00201058A
Other languages
German (de)
English (en)
Other versions
EP1041538A1 (fr
Inventor
Gilles Thomson Multimedia Bourgoin
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.)
Technicolor SA
Original Assignee
Thomson Multimedia 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 Thomson Multimedia SA filed Critical Thomson Multimedia SA
Publication of EP1041538A1 publication Critical patent/EP1041538A1/fr
Application granted granted Critical
Publication of EP1041538B1 publication Critical patent/EP1041538B1/fr
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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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • 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
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
    • G10K11/04—Acoustic filters ; Acoustic resonators
    • 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
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
    • 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
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2853—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line
    • H04R1/2857—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line for loudspeaker transducers
    • 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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Definitions

  • the present invention relates to a mechanical filter for acoustic systems.
  • a mechanical filter for acoustic systems Among the possible applications of such a filter, the case of television sets may be cited.
  • the loudspeakers As a result, one is compelled to site the loudspeakers somewhat behind the front face so as to profit from the spaces available between the electron tube and the side walls of the cabinet of the television set. Since the sound in the middle and high frequencies propagates by following a directional mode, it is preferable for the sound issuing from the loudspeakers to emerge into the sound columns on the front face of the television set.
  • sound guides are used, these being ducts linking the loudspeakers and the sound columns.
  • the ducts have a "horn" shape with one open end which is more flared than the other open end, and which will be called the "acoustic horn” hereinafter.
  • the acoustic horn is in general made by moulding a rigid plastic.
  • the flared end of the horn is secured to the edge of the diaphragm of a loudspeaker, by mechanical fastening, and the other end of the horn is of oblong cross section parallel to a sound column at the front face of the television set and emerging into this column (as for example has been disclosed by US A 5710394).
  • Such acoustic horns are certainly satisfactory from the mechanical and aesthetic standpoint, but exhibit distortions in the sound rendition which are perceptible to the listener.
  • Some state of the art loudspeakers comprise means modifying the acoustic response.
  • Examples of such loudspeakers are given in patent application JP10066182 (which discloses a loudspeaker including a space part absorbing some disturbances of peak dips), USA5432860 (disclosing an acoustic horn provided with apertures, which include passive radiators, modifying the acoustic response of the horn) and USA5479520 (illustrating a loud speaker system comprising a plurality of tubes of different length via which the sound is emitted in order to achieve frequency spreading of resonant peaks in the SPL (Sound pressure level) curve). Nevertheless, these loudspeakers exhibit also some distortions.
  • the object of the invention is also a mechanical filter for acoustic systems which eliminates the resonant peak(s) without introducing perturbation into the acoustic response of the system in the remainder of the acoustic frequency spectrum.
  • the mechanical filter for acoustic systems satisfies the following conditions.
  • the acoustic system comprises at least one loudspeaker and an acoustic horn associated with the loudspeaker, the one open end of the horn being secured to the edge of the diaphragm of the loudspeaker and the other open end of the horn defining an acoustic output.
  • the horn exhibits rigid walls a part of which is rendered flexible. The flexible part of the horn can vibrate under the acoustic pressure inside the horn so as to filter or absorb the resonant peak(s) in the acoustic response of the rigid horn.
  • Figure 1 shows a television set with a cabinet or box 1, enclosing an electron tube (not represented) whose display screen (not represented) emerges into the opening 2 of the front face or façade of the television set.
  • On either side of the opening 2 are two sound or acoustic columns 3 into each of which emerges the oblong open end 4 of an acoustic horn 5.
  • the other flared open end of the horn 5 is fastened to a loudspeaker 6.
  • the role of the horn 5 is to guide the sound produced by the loudspeaker 6 towards the corresponding sound column 3.
  • the acoustic horn 5 exhibits a part with constant oblong cross section 5a and a flared part 5b.
  • the flared open end 7 of the flared part 5b is mounted on the edge or rim 8 of the diaphragm 9 of the loudspeaker 6, with the aid of screws or mechanical clips.
  • the horn 5 is made by moulding of plastics, for example, polystyrene, with a thickness of walls of the order of 2.5 mm to 3 mm. The horn structure thus obtained is rigid.
  • the inventor has noted distortions in the acoustic response curve of a rigid horn 5 of this type. Indeed, for a horn length of around 180 mm, the acoustic response curve exhibits a resonant peak at roundabout 440 Hz (see Figure 4, curve A). This signifies that at the open end 4 of the acoustic horn 5, the sound around the frequency 440 Hz is excessively amplified to the detriment of the surrounding frequencies (150 Hz-300 Hz and 600 Hz-1 kHz). This creates acoustic distortion perceptible to the listener who may also be a television viewer.
  • the invention uses a mechanical vibrational phenomenon, obtained by exciting a slender plate via the acoustic pressure present in the horn 5 and generated by the loudspeaker 6, in such a way as to profit from its first few mechanical natural modes so as to absorb the unwanted peak of the acoustic response of the horn and improve its acoustic performance.
  • the invention can be applied to any acoustic system (sealed or bass-reflex enclosures, labyrinths, other acoustic guides, etc.), since it uses the overpressure created inside a volume (closed or otherwise) by a loudspeaker.
  • FIG. 3 An embodiment of the invention (Fig. 3), which gives a satisfactory solution, consists in making an opening 10 in the rigid walls of the flared part 5b of the horn 5 and in covering the opening 10 with a slender or flexible plate 11, in such a way that the first natural mode of mechanical vibration of this plate 11 (regarded as built in at the boundaries of the opening 10) is adjusted to the resonant frequency to be attenuated.
  • the desired filtering is carried out but without modifying the acoustic response of the system within the remainder of the acoustic frequency spectrum.
  • a simple embodiment consists in making the opening 10 on the horn 5 directly when moulding this component and using polystyrene plates provided with adhesives.
  • the vibrating function of the plate 11 is ensured by the polystyrene plate and the adhesive serves to fasten the plate to the horn 5 and to add damping to the plate, in such a way as to reduce any undesirable effects of the harmonics and other modes of vibration of the plate 11.
  • the plate 11 or vibrating diaphragm can be included directly in the component when moulding.
  • the dimensions of the system to be dealt with and the significance of defects to be eliminated may necessitate the multiplicity of this type of system, that is to say several openings 10 covered by several flexible plates 11.
  • These flexible plates may have the same dimensions so as to reinforce the filtering within a narrow band of frequencies, or different dimensions so as to broaden the frequency band to be filtered.
  • the thickness of the plate is preferably chosen between 10% and 30% of the thickness of the rigid walls surrounding the corresponding opening 10.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Claims (7)

  1. Filtre mécanique pour systèmes acoustiques comprenant au moins un haut parleur (6) et un cornet acoustique (5) associé au haut parleur, l'une extrémité ouverte (7) du cornet étant rendue solidaire du bord (8) de la membrane (9) du haut parleur, et l'autre extrémité ouverte (4) du cornet constituant la sortie acoustique, caractérisé en ce que le cornet (5) présente des parois rigides dont une partie (10,11) est rendue souple, la partie souple du cornet pouvant vibrer sous la pression acoustique à l'intérieur du cornet pour exciter au moins le premier de ses modes mécaniques de façon à filtrer ou absorber le(s) pic(s) de résonance dans la réponse acoustique du cornet rigide.
  2. Filtre mécanique pour systèmes acoustiques selon la revendication 1, caractérisé en ce que la partie souple du cornet est formée par au moins une ouverture (10) dans les parois rigides du cornet (5), l'ouverture étant recouverte par une plaque souple (11).
  3. Filtre mécanique pour systèmes acoustiques selon la revendication 2, caractérisé en ce que la plaque souple (11) est collée sur les parois rigides du cornet.
  4. Filtre mécanique pour systèmes acoustiques selon la revendication 2, caractérisé en ce que la plaque souple (11) est obtenue directement par moulage du cornet.
  5. Filtre mécanique pour systèmes acoustiques selon l'une des revendications 2 à 4, caractérisé en ce que la plaque souple (11) présente une épaisseur comprise entre 10% et 30% de l'épaisseur des parois rigides entourant l'ouverture (10).
  6. Téléviseur comprenant un cabinet (1) cadrant un écran de visualisation, au moins une colonne acoustique (3) adjacente à l'écran, et au moins un filtre mécanique selon l'une des revendications précédentes, la sortie acoustique (4) du cornet (5) débouchant dans la colonne acoustique.
  7. Filtre mécanique pour systèmes acoustiques selon une des revendications 1 à 5, caractérisé en ce que le(s) pic(s) de résonnance dans la réponse acoustique du cornet rigide a une fréquence comprise entre 300 et 600 Hz.
EP00201058A 1999-03-30 2000-03-22 Filtre mécanique pour systèmes acoustiques et téléviseur equipé de tels filtres Expired - Lifetime EP1041538B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9903964 1999-03-30
FR9903964A FR2791802A1 (fr) 1999-03-30 1999-03-30 Filtre mecanique pour systemes acoustiques et televiseur equipe de tels filtres

Publications (2)

Publication Number Publication Date
EP1041538A1 EP1041538A1 (fr) 2000-10-04
EP1041538B1 true EP1041538B1 (fr) 2006-12-20

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EP00201058A Expired - Lifetime EP1041538B1 (fr) 1999-03-30 2000-03-22 Filtre mécanique pour systèmes acoustiques et téléviseur equipé de tels filtres

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Country Link
EP (1) EP1041538B1 (fr)
JP (1) JP2000308175A (fr)
CN (1) CN1181673C (fr)
DE (1) DE60032407T2 (fr)
ES (1) ES2277814T3 (fr)
FR (1) FR2791802A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2819974A1 (fr) * 2001-01-24 2002-07-26 Thomson Licensing Sa Enceinte acoustique et appareil audiovisuel comportant une telle enceinte
WO2017152230A1 (fr) 2016-03-08 2017-09-14 Chill Gaming Pty Ltd Procédé, système et machine de jeu comprenant de multiples jeux
CN106162458A (zh) * 2016-07-19 2016-11-23 南京大学 一种扬声器声传导腔体装置
WO2018191770A1 (fr) * 2017-04-19 2018-10-25 Chill Gaming Pty Ltd Système audio
AU2018214028A1 (en) * 2017-04-19 2018-11-08 Chill Gaming Pty Ltd Audio system
CN109246539A (zh) * 2018-10-17 2019-01-18 无锡杰夫电声股份有限公司 一种加载弹性薄板的薄型扬声器箱
US11310587B2 (en) * 2019-10-08 2022-04-19 Bose Corporation Horn loudspeakers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5432860A (en) * 1990-02-09 1995-07-11 Mitsubishi Denki Kabushiki Kaisha Speaker system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589515B1 (fr) * 1992-09-23 1999-01-27 Koninklijke Philips Electronics N.V. Système de haut-parleur comprenant plusieurs tubes
KR960011026B1 (ko) * 1993-07-26 1996-08-16 대우전자 주식회사 텔레비전의 스피커시스템
JP3449571B2 (ja) * 1994-08-30 2003-09-22 株式会社東芝 テレビジョンセットのスピーカシステム
JP4043539B2 (ja) * 1996-08-21 2008-02-06 松下電器産業株式会社 スピーカ装置の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5432860A (en) * 1990-02-09 1995-07-11 Mitsubishi Denki Kabushiki Kaisha Speaker system

Also Published As

Publication number Publication date
FR2791802A1 (fr) 2000-10-06
ES2277814T3 (es) 2007-08-01
CN1270473A (zh) 2000-10-18
EP1041538A1 (fr) 2000-10-04
CN1181673C (zh) 2004-12-22
DE60032407D1 (de) 2007-02-01
DE60032407T2 (de) 2007-10-11
JP2000308175A (ja) 2000-11-02

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