EP0541646B1 - Haut-parleur sous forme de panneau - Google Patents

Haut-parleur sous forme de panneau Download PDF

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Publication number
EP0541646B1
EP0541646B1 EP91914046A EP91914046A EP0541646B1 EP 0541646 B1 EP0541646 B1 EP 0541646B1 EP 91914046 A EP91914046 A EP 91914046A EP 91914046 A EP91914046 A EP 91914046A EP 0541646 B1 EP0541646 B1 EP 0541646B1
Authority
EP
European Patent Office
Prior art keywords
panel
loudspeaker
radiator
frequency
core
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
EP91914046A
Other languages
German (de)
English (en)
Other versions
EP0541646A1 (fr
Inventor
Kenneth Harry 2 Hilder Gardens Heron
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.)
Qinetiq Ltd
Original Assignee
UK Secretary of State for Defence
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 GB9017133A external-priority patent/GB2246684A/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of EP0541646A1 publication Critical patent/EP0541646A1/fr
Application granted granted Critical
Publication of EP0541646B1 publication Critical patent/EP0541646B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • G10K1/00—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs
    • G10K1/06—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube
    • G10K1/062—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated
    • G10K1/066—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated the sounding member being a tube, plate or rod
    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • 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
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers

Definitions

  • This invention relates to a panel-form loudspeaker utilising a resonant multi-mode radiator, which is suitable for applications requiring thin speaker sections such as in public address loudspeakers.
  • the speaker exhibits a conversion efficiency approaching unity so it is suitable for applications requiring high acoustic power output from the loudspeaker.
  • the diaphragm operates largely at frequencies below those at which it exhibits resonant modes (though typically they can operate above the first resonant frequency of the diaphragm by suitably damping-out this mode) and this imposes spatial and/or frequency limitations upon the loudspeaker which are undesirable.
  • small diaphragms are used but these are not efficient radiators at low frequencies.
  • the first of these is the electrostatic loudspeaker in which the diaphragm is driven by the charge difference experienced between the diaphragm and a rigid backplate closely spaced behind the diaphragm.
  • Electrostatic loudspeakers are capable of yielding a high fidelity output across a wide frequency band and they are of relatively planar configuration suitable for public address applications. However they are expensive and have very low conversion efficiency which detracts from their advantages.
  • the other established form of pistonic-diaphragm loudspeaker is the conventional dynamic loudspeaker which incorporates an edge mounted diaphragm driven by an electro-mechanical driver.
  • loudspeakers have relatively narrow bandwidth and although they are more efficient radiators than the electrostatic loudspeakers they still have low conversion efficiency. In loudspeakers of this form it is necessary to prevent destructive interference between the forward and rearward outputs of the diaphragm. This usually requires that the diaphragm be mounted in the front face of a substantial box housing and consequently precludes flat panel formats.
  • Composite panels comprising thin structural skins between which is sandwiched a light spacing core are commonly used for aerospace structures for example and certain of these may be used in the speaker as claimed herein.
  • the invention claimed herein is a panel-form loudspeaker comprising: a resonant multi-mode radiator element being a unitary sandwich panel formed of two skins of material with a spacing core of transverse cellular construction. wherein the panel is such as to have ratio of bending stiffness (B) to the cube power of panel mass per unit surface area ( ⁇ ) in all orientations of at least 10; a mounting means which supports the panel or attaches it to a supporting body, in a free undamped manner; and an electro-mechanical drive means coupled to the panel which serves to excite a multi-modal resonance in the radiator panel in response to an electrical input within a working frequency band for the loudspeaker.
  • B bending stiffness
  • ⁇ cube power of panel mass per unit surface area
  • transverse cellular construction refers to honeycomb core forms and other cellular based core constructions having non-hexagonal core sections with core cells extending through the thickness of the panel material.
  • T the value of the above-given ratio "T" and a T value as specified above is necessary in order that the radiator panel might function properly in the manner required.
  • T Preferably the value of T should be at least 100.
  • This T value is a measure of the acoustic conversion efficiency of the radiator panel when the loudspeaker is operating as intended at frequencies above its coincidence frequency (see below).
  • a high T value is best achieved by use of honeycomb cored panels having thin metal skins.
  • Our presently preferred panel type is those panels having honeycomb core construction and thin skins with both skins and core being of aluminium or aluminium alloy. With such panels T values of 200 or more can be achieved.
  • loudspeakers are intended to produce a reciprocating and in-phase motion of the diaphragm and seek to avoid modal resonant motions in the diaphragm by design of the diaphragm to exclude them from the loudspeaker frequency band and/or by incorporating suitable damping to suppress them.
  • the present invention does not incorporate any conventional diaphragm but rather uses a panel, meeting the criteria described, as a multi-mode radiator which functions through the excitation of resonant modes in the panel not by forcing it to move in a pistonic, non-resonant manner.
  • the "coincidence frequency” is the frequency at which the bending wave speed in the radiator panel matches the speed of sound in air. This frequency is of the manner of a threshold for efficient operation of the loudspeaker for at frequencies above their coincidence frequency many modern composite sandwich panels radiate efficiently. It is possible using the information provided herein to produce a radiator panel suitable for given frequency bands in which the concidence frequency of the radiator panel will fall at or below the required bandwidth so that the loudspeaker will convert almost all mechanical input from the electro-mechanical drive means into acoustic output. This is more than a mere desideratum for it is this characteristic of high conversion efficiency which overcomes potential problems in a resonant multi-mode radiator based system.
  • a high conversion efficiency (which can be achieved by suitable selection of materials in accordance with the design rules given herein) is achieved when panel motions are constrained by acoustic damping rather than internal structural damping within the panel material or damping imposed by virtue of the panel mounting. When this is achieved acoustic distortions will be small.
  • the loudspeaker as illustrated in Figure 1 comprises a resonant multi-mode radiator 1, a simple support frame 2 from which the radiator is suspended by means of suspension loops 3, and an electro-mechanical exciter 4.
  • the radiator 1 comprises a rectangular panel of aluminium alloy-skinned, aluminium alloy honeycomb sandwich construction. Details of the panel and sizing rules etc are given later.
  • the electromagnetic exciter 4 has a shaft 5 and is mounted upon the support frame 2 such that this shaft 5 bears against the rear of the radiator panel 1 and excites the latter by a reciprocating movement of the shaft when an electrical signal is supplied to the exciter 4. At the point of contact between the shaft 5 and the panel the latter is reinforced by a patch 6 to resist wear and damage.
  • the exciter 4 is positioned such that it excites the radiator panel 1 at a position thereon close to one of its corners not at a position close to its centre point to avoid exciting the panel preferentially in its symmetrical modes.
  • the inertial masses of the exciter 4 and the radiator panel 1 are matched to secure an efficient inertial coupling between the two for efficient power transfer.
  • This version of loudspeaker is suspended from a ceiling 7 rather than a support frame.
  • Four suspension loops 3 are used instead of two in the previous version, so that the radiator panel 1 underlies the ceiling rather than hanging down from it.
  • the exciter 4 is positioned above the radiator 1.
  • T The "T" criterion and the shear modulus criterion, both of which have been mentioned previously relate to panel forms and panel materials rather than panel dimensions and loudspeaker frequency ranges.
  • the "T” criterion and the shear modulus criterion, both of which have been mentioned previously relate to panel forms and panel materials rather than panel dimensions and loudspeaker frequency ranges.
  • the low end of the desired frequency range of the loudspeaker sets a limit upon the fundamental frequency of the panel for this must be below the lowest frequency of interest. Moreover the coincidence frequency of the panel should also be below the lowest frequencies of interest.
  • Design considerations are illustrated by way of example below with reference to one version of the loudspeaker which utilises a radiator panel comprising a 1m x 1m square of aluminium skinned, aluminium honeycomb cored composite.
  • the core depth for the panel is 0.04m and the thickness of each skin is 0.0003m.
  • For this panel B is 18850Nm, ⁇ is 3.38kg/m2, and T is 488Nm7/kg2.
  • the shear stiffness of the panel varies with orientation within the plane of the panel.
  • ⁇ .c2/G.d has a value of 0.056 and for the axis of of its maximum value the same expression has a value of 0.122. Both these values are much less than the limiting value of 1 and indicate that the loudspeaker will not be limited in performance across the intended frequency band by core shear motions.
  • a loudspeaker as claimed utilising a radiator panel in the form of a 1m square of the material detailed above would have a frequency bandwidth of 250 Hz to 4 kHz within which it would have a high conversion efficiency and low distortion. It is anticipated that such a bandwidth would be quite satisfactory for a public address loudspeaker.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Laminated Bodies (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Claims (4)

  1. Haut-parleur en forme de panneau, comprenant :
       un élément radiateur multimode résonant (1) sous forme d'un panneau sandwich solidaire formé de deux revêtements d'un matériau avec une âme d'espacement de construction cellulaire transversale, le panneau étant tel qu'il possède un rapport de sa rigidité à la flexion (B), suivant toutes les orientations, au cube de la masse du panneau par unité de surface (µ) au moins égal à 10,
       un dispositif (3) de montage qui supporte le panneau ou le fixe à un corps (2) de support de manière qu'il soit libre et non amorti, et
       un dispositif électromécanique (4, 5) de pilotage couplé au panneau et qui est utilisé pour l'excitation d'une résonance multimode dans le panneau radiateur sous l'action d'un signal électrique appliqué dans une bande de fréquences de travail du haut-parleur.
  2. Haut-parleur en forme de panneau selon la revendication 1, dans lequel le panneau sandwich constituant l'élément radiateur (1) est tel qu'il a un rapport B/µ³ d'au moins 100.
  3. Haut-parleur en forme de panneau selon la revendication 1 ou 2, dans lequel les revêtements et l'âme du panneau sandwich constituant l'élément radiateur (1) sont formés d'aluminium ou d'un alliage d'aluminium.
  4. Haut-parleur sous forme d'un panneau selon l'une quelconque des revendications précédentes, dans lequel le dispositif électromécanique (4, 5) de pilotage reçoit un signal électrique de pilotage ayant une composante à la fréquence fondamentale supérieure à la fois à la première fréquence de résonance et à la fréquence de coïncidence de l'élément radiateur (1).
EP91914046A 1990-08-04 1991-07-26 Haut-parleur sous forme de panneau Expired - Lifetime EP0541646B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9017133 1990-08-04
GB9017133A GB2246684A (en) 1990-08-04 1990-08-04 Panel form loudspeaker
GB9103969 1991-02-26
GB919103969A GB9103969D0 (en) 1990-08-04 1991-02-26 Panel-form loudspeaker
PCT/GB1991/001262 WO1992003024A1 (fr) 1990-08-04 1991-07-26 Haut-parleur sous forme de panneau

Publications (2)

Publication Number Publication Date
EP0541646A1 EP0541646A1 (fr) 1993-05-19
EP0541646B1 true EP0541646B1 (fr) 1995-01-11

Family

ID=26297455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91914046A Expired - Lifetime EP0541646B1 (fr) 1990-08-04 1991-07-26 Haut-parleur sous forme de panneau

Country Status (8)

Country Link
EP (1) EP0541646B1 (fr)
JP (2) JP3034952B2 (fr)
AT (1) ATE117155T1 (fr)
DE (1) DE69106712T2 (fr)
DK (1) DK0541646T3 (fr)
GB (1) GB2262861B (fr)
HK (1) HK1000544A1 (fr)
WO (1) WO1992003024A1 (fr)

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US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9998832B2 (en) 2015-11-16 2018-06-12 Bongiovi Acoustics Llc Surface acoustic transducer
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US10313791B2 (en) 2013-10-22 2019-06-04 Bongiovi Acoustics Llc System and method for digital signal processing

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CN113676817B (zh) * 2021-08-25 2023-08-25 江苏铁锚玻璃股份有限公司 基于面发声、发声元器件的位置放置方法及面发声组件

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19818988A1 (de) * 1998-04-28 1999-11-11 Siemens Ag Elektronisches Gerät mit einem elektroakustischen Wandler
DE19943084A1 (de) * 1999-09-09 2001-04-05 Harman Audio Electronic Sys Schallwandler
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
US10313791B2 (en) 2013-10-22 2019-06-04 Bongiovi Acoustics Llc System and method for digital signal processing
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9998832B2 (en) 2015-11-16 2018-06-12 Bongiovi Acoustics Llc Surface acoustic transducer

Also Published As

Publication number Publication date
GB9301628D0 (en) 1993-04-14
JP3084281B2 (ja) 2000-09-04
ATE117155T1 (de) 1995-01-15
HK1000544A1 (en) 1998-04-03
GB2262861B (en) 1994-06-01
WO1992003024A1 (fr) 1992-02-20
JP3034952B2 (ja) 2000-04-17
JP2000138994A (ja) 2000-05-16
DE69106712T2 (de) 1995-06-08
DE69106712D1 (de) 1995-02-23
EP0541646A1 (fr) 1993-05-19
GB2262861A (en) 1993-06-30
JPH05509211A (ja) 1993-12-16
DK0541646T3 (da) 1995-03-20

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