EP1138175A2 - Haut-parleur - Google Patents

Haut-parleur

Info

Publication number
EP1138175A2
EP1138175A2 EP99958386A EP99958386A EP1138175A2 EP 1138175 A2 EP1138175 A2 EP 1138175A2 EP 99958386 A EP99958386 A EP 99958386A EP 99958386 A EP99958386 A EP 99958386A EP 1138175 A2 EP1138175 A2 EP 1138175A2
Authority
EP
European Patent Office
Prior art keywords
window
pane
combination
vibration exciter
loudspeaker
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Withdrawn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
EP99958386A
Other languages
German (de)
English (en)
Inventor
Henry Azima
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.)
NVF Tech Ltd
Original Assignee
New Transducers Ltd
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
Priority claimed from GBGB9827040.8A external-priority patent/GB9827040D0/en
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Publication of EP1138175A2 publication Critical patent/EP1138175A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Definitions

  • the invention relates to loudspeakers and more particularly to panel -form loudspeakers.
  • a window e.g. for a vehicle or m a building or m other apparatus formed with a window or viewing port which can be driven as a loudspeaker, e.g. to reproduce speech or music.
  • the present invention is based on the surprising discovery that very high stiffness and very dense materials such as window glass can be successfully driven by mertial vibration exciters intended to drive stiff light weight panels, e.g. mertial vibration exciters as described m O97/09842, provided that certain conditions are met, as described below.
  • a window loudspeaker combination comprising a pane of glass or other transparent material adapted to be supported at its periphery m a surround and a vibration exciter coupled to the pane to cause bending wave vibration therein to produce an acoustic output, characterised m that the vibration exciter is an electrodynamic mertial device having a low mass voice coil, a magnet system associated with the voice coil, and a suspension for mounting voice coil m the magnet system for movement relative thereto, the vibration exciter being mounted on the pane, e.g. via the voice coil .
  • the exciter is positioned on the pane to maximise the interleaving of resonant modes of bending wave vibration.
  • the window may comprise superposed spaced inner and outer panes defining between them a fluid gap, and the vibration exciter may be disposed on the inner pane .
  • the or each pane may be supported at its periphery m a rubber or rubber-like glazing seal.
  • the window loudspeaker combination may comprise electrical leads on the pane for connecting the vibration exciter to a signal source, the leads being substantially invisible .
  • the window or other member may be of plastics or may be of glass or other transparent material, e.g. transparent plastics, and may form part of a vehicle such as an automobile, aircraft railway tram or boat or may form part of a building or other fixed structure or other device having a window or viewing port.
  • More than one vibration exciter may be provided to apply bending wave energy to the pane to cause it to resonate to produce an acoustic output.
  • the drive means may be mounted to an edge or marginal portion of the panel- form member as taught 099/37121 or to a portion of the pane outside its transparent portion or at least outside a portion thereof used as a window.
  • the invention is a vehicle or other structure incorporating one or more loudspeaker windows as defined above.
  • Figure 1 is a perspective view of part of an omnibus coach or railway tram carriage incorporating window loudspeakers of the present invention
  • Figure 2 is a perspective view of part of the passenger cabin of an aircraft incorporating window loudspeakers of the present invention
  • Figure 3 is a face view of an automobile or the like motor vehicle windscreen or windshield incorporating window loudspeakers of the present invention
  • Figure 4 is a perspective view of the rear windshield or screen or an automobile incorporating window loudspeakers of the present invention
  • Figure 5 is a perspective view of a door for an automobile incorporating window loudspeakers of the present invention.
  • Figure 6 is a perspective view of a fixed side window of an automobile incorporating window loudspeakers of the present invention
  • Figure 7 shows a window m a building incorporating window loudspeakers of the present invention
  • Figure 8 is a perspective view of a bay window m a building incorporating window loudspeakers of the present invention.
  • Figure 9 is a face view of a door m a building incorporating window loudspeakers of the present invention
  • Figure 10 is a face view of a pair of glass doors a building incorporating window loudspeakers of the present invention
  • Figure 11 is a face view of a double glazed window m a building incorporating window loudspeakers of the present invention
  • Figure 12 is a partial cross-sectional view of the double glazed window/loudspeaker combination of Figure 11;
  • Figure 13 is a frequency response graph of an example of window loudspeaker
  • Figure 14 is a graph of double glazed window attenuation
  • Figure 15 is a graph of m-room sound pressures at 1M and 2M from the window loudspeaker
  • Figure 16 is a mathematical model of a double glazed window of the kind as shown m Figure 12;
  • Figure 17 is a graph of a mathematical simulation corresponding to Figure 14 ;
  • Figure 18 is a graph of a mathematical simulation of the velocities of the passive and driven panes the model of Figure 16.
  • FIG. 1 shows part of the interior (1) of an omnibus coach or railway tra carriage (2) having seating (3) for passengers and windows (4) associated with the seating and which are driven to resonate by vibration exciters (5) applied to the lower margins (6) of the window panes at positions hidden from view to cause the window panes to act as loudspeakers substantially as described m our International patent application W099/37121.
  • Additional resonant panel loudspeakers (7) e.g. as taught WO97/09842 are mounted overhead, e.g. m the roof (not shown) of the carriage (2) .
  • Figure 2 shows part of the interior (1) of the passenger cabin (2) of an aircraft (8) and showing cabin windows (4) driven to act as loudspeakers m a manner which, m essence, is generally similar to that of Figure 1.
  • Figure 3 is a view of an automobile or the like motor vehicle windscreen or windshield (9) m which vibration exciters (5) have been applied to marginal portions of the screen so as to be invisible to the vehicle occupants and arranged to cause the screen to resonate to act as a loudspeaker substantially as described m our International patent application W099/37121.
  • the vehicle dashboard is shown m dashed lines at (10) along with a steering wheel (11) and rear view mirror (12) .
  • Figure 4 is a view generally similar to that of Figure 3 and showing the rear windshield or screen (13) of an automobile or the like driven to act as a resonant panel loudspeaker, and showing a rear parcel shelf (14) .
  • Figure 5 is a view of a door 15) for an automobile having an openable window (16) slidable m a frame (17) with vibration exciters (5) applied to the lower marginal edge (6) of the window glass out of sight of the vehicle occupants whereby the window is driven to resonate and to act as a loudspeaker substantially as described our International patent application W099/37121.
  • Figure 6 is a partial view of an automobile (18) having a fixed rear side window (19) and having vibration exciters (5) applied to the lower marginal portion (6) of the glass window panel (19) out of sight of the vehicle occupants whereby the window can be driven to resonate and to act as a loudspeaker substantially as described m International patent application W099/37121.
  • Figure 7 shows a window (20) the wall (22) of a building (21) and comprising a glass pane excited at its upper edge (23) at a position hidden from view behind the window frame by a pair of vibration exciters (5) to form a loudspeaker e.g. of the kind described m our International application W099/37121.
  • Figure 8 shows a bay window (24) m a building (21) and m which panes of glass (25) are driven to resonate and to act as loudspeakers e.g. of the kind described m our above application by vibration exciters (5) mounted near the lower edges of respective panes, at a position hidden from view behind the window frame.
  • Figure 9 shows a door (26) a building (21) incorporating a glass pane (25) which is excited to resonate to act as a loudspeaker e.g. of the kind described m our above application by vibration exciters (5) mounted at the lower edge of the pane at a position hidden from view behind the window frame .
  • Figure 10 shows a pair of glass doors (27) m a building (21) and each of which is driven by a pair of vibration exciters (5) mounted at the upper edges of the doors to resonate the doors to act as loudspeakers e.g. of the kind described in our above application.
  • Figures 11 and 12 show a double glazed wm ⁇ ow (28) the wall (22) of a building (21) which defines a room (29) and shows that, where desired, the vibration exciter (s) (5) may be mounted inwardly of the edges of the panes of glass, i.e. m a near centre position on the pane, to act as loudspeakers e.g. of the kind described m our International application WO97/09842.
  • the exciter (s) is of the electrodynamic mertial kind as described m WO97/09842 or m WO98/34320 and is mounted wholly on the pane either exclusively via the voice coil or via the voice coil with a resilient suspension between the pane and the magnet assembly
  • Figure 12 shows that the vibration exciter (5) is mounted on the inner pane (30) of the pair of glass panes
  • Figure 13 shows a frequency response curve of a window as shown m Figures 11 and 12, and demonstrates a wide effective sound output m the 20Hz to 15KHz region.
  • Figure 14 is a graph measuring, m-room, the effect of the double pane sound attenuation of a window loudspeaker as shown m Figures 11 and 12.
  • the lower curve is of the excitation of the external pane (31)
  • the upper curve is of the inner (room) pane (30) excitation.
  • Figure 15 is a graph of the m-room sound pressure of an example of window loudspeaker as shown m Figures 11 and 12, and showing m the heavy line curve the measurement at 1M and m the light line curve the measurement at 2M.
  • Sound from windows m domestic or commercial premises may be used for announcements, for background music, for noise cancellation and or noise masking, e.g. where low level pink or similarly weighted noise is employed to reduce the annoying effect of other, more periodic noise sources.
  • a consideration is the dipolar bi-directional nature of sound radiating windows now proposed, for example a window m an outside wall.
  • the sound radiated to the outside may be a disadvantage m a domestic setting or an advantage m the case of shop window display disposed to the street with the exciter located m a protected position on the mside.
  • Modern double and triple glazed window units provide new opportunities for effective window speakers since useful attenuation may be obtained to the environment furthest from the driven pane of the assembly.
  • Each air layer, m con unction with the window elements may provide an attenuation of around 8 to 12 dB according to the pane and air space thickness.
  • the far field sound intensity will predominantly follow the inverse square law and the sound pressure falls rapidly with distance. This plus the option of multiple glazing means that the exterior leakage may be successfully controlled.
  • Factors which have encourage a renewed interest m the subject include the multiple glazing integer and the availability of wide band essentially non resonant, low driving mass exciters such as those described m WO98/34320 and suitable for driving distributed mode loudspeakers of the kind described m WO97/09842.
  • the speaker field the mechanical characteristics of the glass panel have been analysed to determine effective methods of excitation as a worthwhile loudspeaker.
  • Self supporting exciters may be placed at a number of effective positions including near the edge, for unobtrusiveness, as taught m W099/37121 or at optimal near centre locations as taught m WO97/09842. Since these exciters may be very compact and thm wire or even transparent tin oxide wiring may be used, the small exciters may be acceptably placed at the more optimum locations protected and enhanced by small lightweight covers .
  • a double glazed window/loudspeaker was built using a 25mm coil mertial electrodynamic exciter of the kind described m WO98/34320 at a near central position and the attenuation measured from the front to the rear (undriven) side see Fig.14. Note that for this measurement the sound power was measured m-room for both readings while m practice the external leakage would be significantly lower due to the near free space radiation condition.
  • the graph of Figure 17 is a simplified two dimensional model showing mean external (free field) sound pressure levels at lm (heavy curve) at 2m (light curve) .
  • the graph of Figure 18 is a computer two dimensional analysis of the velocities of the driven and passive panes m the double glazing. This indicates that the two panes are quite well coupled at low frequencies but are advantageously de-coupled at higher frequencies.
  • the present invention enables the ready manufacture of bending wave loudspeaker/wmdow combinations which avoid the severe practical problems encountered m the prior art .

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

La présente invention concerne une combinaison de haut-parleur de fenêtre comprenant une vitre en verre, ou formée d'un autre matériau transparent, conçue afin de pouvoir être supportée à sa périphérie dans un encadrement, et un excitateur de vibration couplé à la vitre causant des vibrations de déformation afin de produire une sortie acoustique, caractérisée en ce que l'excitateur est constitué d'un dispositif inertiel électrodynamique à bobine mobile de faible masse, d'un système magnétique associé à la bobine mobile, et d'une suspension permettant de monter la bobine dans le système magnétique en lui assurant un mouvement relatif, l'excitateur de vibration étant monté en entier sur la vitre.
EP99958386A 1998-12-09 1999-12-09 Haut-parleur Withdrawn EP1138175A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9827040.8A GB9827040D0 (en) 1998-12-09 1998-12-09 Loudspeaker
GB9827040 1998-12-09
GB9900674 1999-01-14
GB9900674 1999-01-14
PCT/GB1999/004080 WO2000035242A2 (fr) 1998-12-09 1999-12-09 Haut-parleur

Publications (1)

Publication Number Publication Date
EP1138175A2 true EP1138175A2 (fr) 2001-10-04

Family

ID=26314809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99958386A Withdrawn EP1138175A2 (fr) 1998-12-09 1999-12-09 Haut-parleur

Country Status (6)

Country Link
EP (1) EP1138175A2 (fr)
JP (1) JP2002532993A (fr)
CN (1) CN1329809A (fr)
AU (1) AU1576000A (fr)
TW (1) TW457826B (fr)
WO (1) WO2000035242A2 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3512087B2 (ja) 1999-06-15 2004-03-29 日本電気株式会社 パネルスピーカ
US6721436B1 (en) * 2000-03-29 2004-04-13 Sound Advance Systems, Inc. Remote edge-driven panel speaker
GB2376829A (en) * 2001-04-21 2002-12-24 Michael Andrew Beadman Removable audio exciter system
GB0117663D0 (en) * 2001-07-20 2001-09-12 New Transducers Ltd Listening anti eavesdropping device
DE10164509A1 (de) * 2001-12-28 2003-07-17 Webasto Vehicle Sys Int Gmbh Lautsprechersystem für die Audioanlage eines Kraftfahrzeuges
US6988339B2 (en) 2002-02-06 2006-01-24 Andersen Corporation Specialty media window
US7426804B2 (en) 2002-02-06 2008-09-23 Andersen Corporation Specialty display window
EP1385354A1 (fr) * 2002-07-25 2004-01-28 Kam, Tai-Yan Haut-parleur transparent en forme de panneau
US6957516B2 (en) * 2002-12-03 2005-10-25 Smart Skin, Inc. Acoustically intelligent windows
JP2007116422A (ja) 2005-10-20 2007-05-10 Sony Corp 音声出力装置および方法
DE102007030811A1 (de) 2007-04-26 2008-11-06 Airbus Deutschland Gmbh Flachlautsprecher
FR3021268A1 (fr) * 2014-05-20 2015-11-27 Peugeot Citroen Automobiles Sa Vitrage de vehicule automobile dans lequel est integre un haut-parleur
CN105812989A (zh) * 2014-12-31 2016-07-27 鸿富锦精密工业（深圳）有限公司 扬声器
GB2611026A (en) * 2021-09-17 2023-03-29 Continental Automotive Tech Gmbh Vehicle intercom system

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US4352039A (en) * 1980-07-25 1982-09-28 The United States Of America As Represented By The Secretary Of The Army Sonic transducer
CA1284837C (fr) * 1987-06-18 1991-06-11 Highwood Audio Inc. Transducteur audio
US4926486A (en) * 1987-07-17 1990-05-15 Barsumian Bruce R Transducer assembly for automatic message system
GB9410281D0 (en) * 1994-05-20 1994-07-13 Moonstone Technology Ltd Through glass speaker
UA51671C2 (uk) * 1995-09-02 2002-12-16 Нью Транзд'Юсез Лімітед Акустичний пристрій

Non-Patent Citations (1)

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Title
See references of WO0035242A3 *

Also Published As

Publication number Publication date
WO2000035242A2 (fr) 2000-06-15
CN1329809A (zh) 2002-01-02
TW457826B (en) 2001-10-01
WO2000035242A3 (fr) 2000-08-31
JP2002532993A (ja) 2002-10-02
AU1576000A (en) 2000-06-26

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