GB2427320A - Bending wave loudspeaker driven from multiple, different sources - Google Patents

Bending wave loudspeaker driven from multiple, different sources Download PDF

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Publication number
GB2427320A
GB2427320A GB0512019A GB0512019A GB2427320A GB 2427320 A GB2427320 A GB 2427320A GB 0512019 A GB0512019 A GB 0512019A GB 0512019 A GB0512019 A GB 0512019A GB 2427320 A GB2427320 A GB 2427320A
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GB
United Kingdom
Prior art keywords
loudspeaker
audio signals
source
transducer means
acoustic radiator
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Withdrawn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
GB0512019A
Other versions
GB0512019D0 (en
Inventor
Richard Newlove
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.)
Amina Technologies Ltd
Original Assignee
Amina Technologies 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
Application filed by Amina Technologies Ltd filed Critical Amina Technologies Ltd
Priority to GB0512019A priority Critical patent/GB2427320A/en
Publication of GB0512019D0 publication Critical patent/GB0512019D0/en
Publication of GB2427320A publication Critical patent/GB2427320A/en
Withdrawn legal-status Critical Current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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/021—Transducers or their casings adapted for mounting in or to a wall or ceiling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2227/00—Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups
    • H04R2227/005—Audio distribution systems for home, i.e. multi-room use

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The loudspeaker system comprises a first source 20 and a second source 30. The first source transmits public address audio signals over a first high voltage line 25 to a loudspeaker 40. The second source transmits entertainment or musical audio signals over a second line 35 to the same loudspeaker 40. The loudspeaker diaphragm 42 bears two exciters 44, 46. The first exciter 44 receives signals from the high voltage line 25 via a step-down transformer 48; the second exciter receives signals directly from the line 35. The loudspeaker system is intended to be wall-mounted by way a frame 41, with the diaphragm covered with a cement-like layer, e.g. plaster. The system may be used in a hotel.

Description

TITLE: LOUDSPEAKER SYSTEM AND LOUDSPEAKER THEREFOR
DESCRIPTION
The present invention relates generally to a loudspeaker system for reproducing signals received from * ** two different signal sources, and particularly but not SI..
exclusively to a loudspeaker system for use in a public :. address system. * *5s
*. 20 It is well known to provide in a public place a * public address system for disseminating information (e.g. S * * emergency or safety information) to people in the vicinity of that public place. For example, it is known in the art to provide voice alarm systems in hotels for disseminating information to guests and hotel staff (e.g. in the event of an emergency) . Conventionally, such systems are implemented by providing loudspeakers at a variety of locations within the public place (e.g. in each guest room in a hotel) . Generally, each loudspeaker is connected via a high impedance line to a high voltage source configured to relay audio signals to each loudspeaker. A step-down transformer may be provided at each loudspeaker to convert high voltage audio signals transmitted along the high impedance line and received at the loudspeakers into low voltage signals suitable for driving the loudspeakers.
It is also known in the art to provide in public places entertainment means having an audio or audiovisual output. For example, it is known to provide rooms of a hotel with their own entertainment systems (i.e. music or audio/visual systems) which are controllable by a guest occupying a room to select a desired output.
Conventionally, audio output from such systems is provided by dedicated loudspeakers which are separate to those used * *.
in any public address system. *** S
is..' The present inventor has identified the need for an :. improved loudspeaker system which offers certain
I
*. 20 advantages over the prior art.
* In accordance with a first aspect of the present I * * invention, there is provided a loudspeaker system comprising: first source means configured to transmit public address audio signals over a first line; second source means configured to transmit entertainment audio signals over a second line; and a loudspeaker comprising: an acoustic radiator; first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound, the first transducer means being configured to receive public address audio signals transmitted from the first source means, and the second transducer means being configured to receive entertainment audio signals from the second source means.
In this way, a loudspeaker system is provided which is capable of reproducing both public address audio signals and entertainment audio signals using only a single acoustic radiator, thereby obviating the need to provide two sets of loudspeakers.
The acoustic radiator referred to throughout this specification is intended to radiate sound energy through propagation of flexural vibrations, rather than pistonic movement. The acoustic radiator may thus act as a distributed mode acoustic radiator (as described in * S. *S..
The loudspeaker system may further comprise :. transformer means coupled to the first transducer means * 551 *. 20 for modifying received public address audio signals into a lower voltage version thereof for delivery to the first * * 5...; transducer means. In this way, a loudspeaker system is provided which is capable of reproducing both high voltage public address audio signals transmitted over a high impedance line and entertainment audio signals. The transformer means may comprise a step-down transformer.
The acoustic radiator may be mounted to a frame for embedding in an aperture in a wall (e.g. stud wall). In this way, the loudspeaker may be discreetly mounted in a building. In one embodiment, an outer surface of the S acoustic radiator is mounted flush with/in the same plane of the wall surface. The outer surface comprises a layer of material bonded to an underlying substrate of the acoustic radiator. The layer of material comprises a cement-like material applied in plastic form and hardened in situ (e.g. plaster). In this way, the loudspeaker may be an integral part of the wall.
The loudspeaker system may comprise at least one further loudspeaker, the or each at least one further loudspeaker being configured to receive public address audio signals from the first source means. The or each at least one further loudspeaker may be further configured to receive entertainment audio signals from the second source means. In one embodiment, the second source means comprises a plurality of discrete audio sources each connected to the second transducer means of a respective loudspeaker. For example, each audio source may be : associated with one of a plurality of rooms in a hotel, each audio source being independently controllable by a guest in a room. In another embodiment, the second source means comprises a single audio source connected to the and each at least one further loudspeaker (e.g. over a further high impedance line). In the latter embodiment, the loudspeaker may comprise a further transformer means coupled to the second transducer means for modifying received entertainment audio signals into a lower voltage version thereof for delivery to the second transducer means.
The loudspeaker system may further comprise switch means for selectively transmitting either public address or entertainment audio signals to the or each loudspeaker.
In accordance with a second aspect of the present invention, there is a method of transmitting public address audio signals and entertainment audio signals using a single loudspeaker, comprising the steps of: providing a loudspeaker comprising: an acoustic radiator; first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound; and transmitting public address audio signals over * *.
a first line to the first transducer means and S...
transmitting entertainment audio signals over a second line to the second transducer means.
The loudspeaker system may further comprise transformer means coupled to the first transducer means for modifying received audio signals into a lower voltage version thereof prior to passing audio signals to the first transducer means; and the step of transmitting public address audio signals to the first transducer means may comprise transmitting public address audio signals over a high impedance line to the first transducer means via the transformer means. The transformer means may comprise a step-down transformer.
In one embodiment, the loudspeaker comprises a frame for embedding in an aperture in a wall (e.g. stud wall), and the method further comprising mounting the frame in an aperture in a wall. The method may further comprise the step of positioning an outer surface of the acoustic radiator flush with/in the same plane of the wall surface.
The outer surface of the acoustic radiator may be formed by bonding a layer of material to an underlying substrate of the acoustic radiator. For example, a cement-like material (e.g. plaster) may be applied to an underlying substrate in plastic form and allowed to harden in situ.
In this way, the loudspeaker may become an integral part of the wall.
The method may further comprise the step of providing at least one further loudspeaker, the or each at least one 4I** further loudspeaker being configured to receive public address audio signals and entertainment audio signals from IS.
the first and second source means respectively. In one embodiment, the second source means comprises a plurality * of discrete audio sources each connected to the second S...
transducer means of a respective loudspeaker. For example, each audio source may be associated with one of a plurality of rooms in a hotel, each audio source being independently controllable by a guest in a room. In another embodiment, the second source means comprises a single audio source connected to each loudspeaker (e.g. over a further high impedance line) . In the latter embodiment, the loudspeaker may comprise a further transformer means coupled to the second transducer means for modifying received entertainment audio signals into a lower voltage version thereof for delivery to the second transducer means.
The method may further comprise selectively switching between public address and entertainment audio signals such that only one signal is reproduced by the loudspeaker.
In accordance with a third aspect of the present invention, there is provided a loudspeaker comprising: an acoustic radiator; first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound, the first and second transducer means being configured to receive audio signals * S. S from first and second audio signal sources respectively, and transformer means coupled to the first transducer *5S means, the transformer means being configured to modify an electrical signal into a lower voltage version thereof prior to passing audio signals to the first transducer means.
In this way, a loudspeaker is provided which is capable of reproducing a high voltage audio signal (e.g. of the type transmitted along a high voltage line) and a signal from a separate audio signal source using only a single acoustic radiator.
In one embodiment, the second transducer means is configured to receive an audio signal transmitted from a local source over a low impedance line. In this way, the loudspeaker may be configured to accept both a high voltage signal transmitted over a high impedance line and a low voltage signal transmitted over a low impedance line. Such a loudspeaker may be particularly suitable for use in a loudspeaker system in a hotel or the like.
In another embodiment, the loudspeaker may comprise further transformer means coupled to the second transducer means, the further transformer means being configured to modify an electrical signal into a lower voltage version thereof prior to passing audio signals to the second transducer means. In this way, the loudspeaker may be configured to accept high voltage signals transmitted over I...
two sets of high impedance lines.
:. The loudspeaker may be configured to be embedded in a *a.
wall. For example, the loudspeaker may comprise a frame for embedding in an aperture in a wall.
In accordance with a fourth aspect of the present invention, there is provided an in-wall loudspeaker comprising: a frame for embedding in an aperture in a wall; an acoustic radiator mounted to the frame; and first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound, the first and second transducers means being configured to receive input signals from first and second inputs respectively.
In this way, there is provided a discreetly mountable loudspeaker which is capable of reproducing both left and right channels of a stereo signal. Such a loudspeaker may be well suited for use in small rooms (e.g. bathrooms or the like) where space is limited and stereo imaging is inessential.
In accordance with a fifth aspect of the present invention, there is a method of installing an in-wall loudspeaker comprising the steps of: providing a loudspeaker comprising: a frame for embedding in an aperture in a wall; an acoustic radiator mounted to the frame; and first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound, the first and second ss transducers means being configured to receive input signals from first and second channels respectively; * mounting the frame in an aperture in a wall; and covering an outer surface of the acoustic radiator with a layer of cement-like material (e.g. plaster) in plastic form and allowing the material to harden in situ.
In this way, the loudspeaker may become an integral part of the wall. Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 is a schematic illustration of a system according to one aspect of the present invention; and Figure 2 is an exploded schematic view of the loudspeaker of Figure 1 embedded in a wall.
Figure 1 shows a loudspeaker system 10 installed in a hotel, comprising a centrally located first source means 20, a plurality of second source means 30 each located in a respective room of a hotel, and a plurality of in-wall loudspeakers 40 each associated with a respective second source means 30. First source means 20 is a voice alarm system configured to transmit public address audio signals (i.e. preset audio messages) . First source means 20 comprises a 100V line power amplifier 22 connected to a high impedance line 25. Second source means 30 are each a s..
local room entertainment system comprising a local source (e.g. music/video source) and an amplifier (not * S..
illustrated) . Each second source means 30 has a low impedance output 32 connected to a low impedance line 35.
The second source means may be mono or stereo; in the example shown, the second source has stereo outputs.
In-wall loudspeakers 40 each comprise a frame 41 for embedding in an aperture in a wall, an acoustic radiator 42, first and second transducer means 44,46 positioned to excite bending waves in the acoustic radiator, and a step- down transformer 48 coupled to the first transducer means 44. The first transducer means is connected via the step- down transformer 48 to the high impedance line 25 to receive public address audio signals transmitted from the first source means 20. In use, the step-down transformer 48 modifies high voltage signals transmitted along the high impedance line into lower voltage signals suitable for driving the loudspeaker. The second transducer means 46 is connected to low impedance line 35 for receiving entertainment audio signals from the second source.
The loudspeaker may comprise an optional control signal (represented by line 70) to mute the second source when a public address signal is being transmitted.
Figure 2 is an exploded view of an in-wall loudspeaker 40 mounted in an aperture 80 in a stud wall 82 in a room of the hotel. During installation, mounting :.:::. regions 84 located at four corners of the frame are registered with mounting lugs 86 located in the aperture 80, behind plaster board 83. Once registered, the loudspeaker 40 is secured to the stud wall 82 by anchoring screws in the lugs 86 through apertures 85 in the mounting regions 84. Once in position in the wall, the loudspeaker 40 may be further concealed from view by applying a thin layer (perhaps 1mm to 2mm thick) of finishing plaster.

Claims (38)

CLAI MS
1. A loudspeaker system comprising: first source means configured to transmit public address audio signals over a first line; second source means configured to transmit entertainment audio signals over a second line; and a loudspeaker comprising: an acoustic radiator; and first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound, the first transducer : means being configured to receive public address audio signals transmitted from the first source S...
means, and the second transducer means being * *S configured to receive entertainment audio signals
SSS
* from the second source means. * * * S S S.. S
2. A loudspeaker system according to claim 1, further comprising transformer means coupled to the first transducer means for modifying received public address audio signals into a lower voltage version thereof for delivery to the first transducer means.
3. A loudspeaker system according to claim 2, in which the transformer means comprises a step-down transformer.
4. A loudspeaker system according to any preceding claim, in which the acoustic radiator is mounted to a frame for embedding in an aperture in a wall.
5. A loudspeaker system according to claim 4, in which an outer surface of the acoustic radiator is mounted flush with the wall surface.
6. A loudspeaker system according to claim 5, in which the outer surface comprises a layer of material bonded to an underlying substrate of the acoustic radiator.
:
7. A loudspeaker system according to claim 6, in which S...
the layer of material comprises a cement-like material applied in plastic form and hardened in situ. * . . S...
8. A loudspeaker system according to any preceding claim, in which the loudspeaker system comprises at least one further loudspeaker, the or each at least one further loudspeaker being configured to receive public address audio signals from the first source means.
9. A loudspeaker system according to claim 8, in which the or each at least one further loudspeaker is further configured to receive entertainment audio signals from the second source means.
10. A loudspeaker system according to any one of claims 8 or 9, in which the second source means comprises a plurality of discrete audio sources each connected to the second transducer means of a respective loudspeaker.
11. A loudspeaker system according to claim 10, in which each audio source is associated with one of a plurality of rooms in a hotel, each audio source being independently controllable by a guest in a room.
12. A loudspeaker system according to any one of claims 8 or 9, in which the second source means comprises a single audio source connected to the loudspeaker and the or each at least one further loudspeaker S...
13. A loudspeaker system according to claim 12, in which * the single audio source is connected to the loudspeaker and the or each at least one further loudspeaker over a high impedance line.
14. A loudspeaker system according to claim 13, in which the loudspeaker comprises a further transformer means coupled to the second transducer means for modifying received entertainment audio signals into a lower voltage version thereof for delivery to the second transducer means.
15. A loudspeaker system according to any preceding claim, in which the loudspeaker system comprising switch means for selectively transmitting either public address or entertainment audio signals to the or each loudspeaker.
16. A method of transmitting public address audio signals and entertainment audio signals using a single loudspeaker, comprising the steps of: providing a loudspeaker comprising: an acoustic radiator; and first and second transducer means positioned to excite bending waves in the acoustic radiator : in order to radiate sound; and S...
transmitting public address audio signals over a first S...
line to the first transducer means and transmitting * S. entertainment audio signals over a second line to the second transducer means. * S * * . S.. S
17. A method according to claim 16, in which the loudspeaker system further comprises transformer means coupled to the first transducer means for modifying received audio signals into a lower voltage version thereof prior to passing audio signals to the first transducer means.
18. A method according to claim 17, in which the step of transmitting public address audio signals to the first transducer means comprises transmitting public address audio signals over a high impedance line to the first transducer means via the transformer means.
19. A method according to any one of claims 19 or 18, in which the transformer means comprises a step-down transformer.
20. A method according to any one of claims 16 to 19, in which the loudspeaker further comprises a frame for embedding in an aperture in a wall.
:
21. A method according to claim 20, in which the method further comprising mounting the frame in an aperture in a S... wall. * .. * . . S. .. ***
22. A method according to any one of claims 20 or 21, in which the method further comprises the step of positioning an outer surface of the acoustic radiator flush with/in the same plane as the wall surface.
23. A method according to claim 22, in which the outer surface of the acoustic radiator is formed by bonding a layer of material to an underlying substrate of the acoustic radiator.
24. A method according to claim 23, in which a cement- like material is applied to an underlying substrate in plastic form and allowed to harden in situ.
25. A method according to any one of claims 16 to 24, in which the method further comprises the step of providing at least one further loudspeaker, the or each at least one further loudspeaker being configured to receive public address audio signals and entertainment audio signals from first and second source means, respectively.
26. A method according to claim 25, in which the second : * source means comprises a plurality of discrete audio S...
sources each connected to the second transducer means of a S...
: 15 respective loudspeaker. S. 0**
27. A method according to claim 26, in which each audio source is associated with one of a plurality of rooms in a hotel, each audio source being independently controllable by a guest in a room.
28. A method according to claim 25, in which the second source means comprises a single audio source connected to each loudspeaker.
29. A method according to claim 28, in which the single audio source is connected to each loudspeaker via a further high impedance line.
30. A method according to any one of claims 16 to 24, in which the loudspeaker comprises a further transformer means coupled to the second transducer means for modifying received entertainment audio signals into a lower voltage version thereof for delivery to the second transducer means.
31. A method according to any one of claims 16 to 30, in : which the method further comprises selectively switching between public address and entertainment audio signals * *. S * 15 such that only one signal is reproduced by the loudspeaker.
32. A loudspeaker, comprising: *5***I * * an acoustic radiator; first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound, the first and second transducer means being configured to receive audio signals from first and second audio signal sources respectively; and transformer means coupled to the first transducer means, the transformer means being configured to modify an electrical signal into a lower voltage version thereof prior to passing audio signals to the first transducer means.
33. A loudspeaker according to claim 32, in which the second transducer means is configured to receive an audio signal transmitted from a local source over a low impedance line.
34. A loudspeaker according to any one of claims 32 or 33, in which the loudspeaker further comprises further transformer means coupled to the second transducer means, the further transformer means being configured to modify an electrical signal into a lower voltage version thereof -S..
prior to passing audio signals to the second transducer * S. S means.
S * 5 4 S...
35. A loudspeaker according to any one of claims 32 to 34, in which the loudspeaker is configured to be embedded 4GSêS * . inawall.
36. A loudspeaker according to any one of claims 32 to 35, in which the loudspeaker further comprises a frame for embedding in an aperture in a wall.
37. An in-wall loudspeaker comprising: a frame for embedding in an aperture in a wall; an acoustic radiator mounted to the frame; and first and second transducer means positioned to excite bending waves in the acoustic radiator in order to radiate sound, the first and second transducers means being configured to receive input signals from first and second inputs respectively.
38. A method of installing an in-wall loudspeaker comprising the steps of: providing a loudspeaker comprising: a frame for embedding in an aperture in a wall; an acoustic radiator mounted to the frame; and * * * * I p.. p first and second transducer means Positioned ** b to excite bending waves in the acoustic radiator in order to radiate sound, the first and second transducers means being configured to receive input signals from first and second channels respectively; mounting the frame in an aperture in a wall; and covering an outer surface of the acoustic radiator with a layer of cement-like material (e.g. plaster) in plastic form and allowing the material to harden in Situ.
GB0512019A 2005-06-14 2005-06-14 Bending wave loudspeaker driven from multiple, different sources Withdrawn GB2427320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0512019A GB2427320A (en) 2005-06-14 2005-06-14 Bending wave loudspeaker driven from multiple, different sources

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0512019A GB2427320A (en) 2005-06-14 2005-06-14 Bending wave loudspeaker driven from multiple, different sources

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GB0512019D0 GB0512019D0 (en) 2005-07-20
GB2427320A true GB2427320A (en) 2006-12-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2568282A (en) * 2017-11-10 2019-05-15 Amina Tech Limited Flat panel loudspeaker

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4319088A (en) * 1979-11-01 1982-03-09 Commercial Interiors, Inc. Method and apparatus for masking sound
DE3828634A1 (en) * 1988-08-24 1989-06-29 Daimler Benz Ag Acoustic information device and warning device in a vehicle
DE3901745A1 (en) * 1989-01-21 1990-07-26 Electronic Werke Deutschland Circuit for a loudspeaker having a number of voice coils
GB2251355A (en) * 1990-11-17 1992-07-01 Electro Acoustic Ind Limited Loudspeaker having multiple voice coils
GB2301728A (en) * 1995-06-03 1996-12-11 Knowles Electronics Co Loudspeaker or microphone having two voice coils
WO2002015638A2 (en) * 2000-08-11 2002-02-21 New Transducers Limited Loudspeaker using a plurality of exciters
US20020021812A1 (en) * 2000-08-11 2002-02-21 Graham Bank Loudspeaker

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4319088A (en) * 1979-11-01 1982-03-09 Commercial Interiors, Inc. Method and apparatus for masking sound
DE3828634A1 (en) * 1988-08-24 1989-06-29 Daimler Benz Ag Acoustic information device and warning device in a vehicle
DE3901745A1 (en) * 1989-01-21 1990-07-26 Electronic Werke Deutschland Circuit for a loudspeaker having a number of voice coils
GB2251355A (en) * 1990-11-17 1992-07-01 Electro Acoustic Ind Limited Loudspeaker having multiple voice coils
GB2301728A (en) * 1995-06-03 1996-12-11 Knowles Electronics Co Loudspeaker or microphone having two voice coils
WO2002015638A2 (en) * 2000-08-11 2002-02-21 New Transducers Limited Loudspeaker using a plurality of exciters
US20020021812A1 (en) * 2000-08-11 2002-02-21 Graham Bank Loudspeaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2568282A (en) * 2017-11-10 2019-05-15 Amina Tech Limited Flat panel loudspeaker
GB2568282B (en) * 2017-11-10 2020-11-25 Amina Tech Limited Flat panel loudspeaker
US11388518B2 (en) 2017-11-10 2022-07-12 Amina Technologies Limited Flat panel loudspeaker

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Publication number Publication date
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