EP1408717B1 - Combination loudspeaker unit - Google Patents

Combination loudspeaker unit Download PDF

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Publication number
EP1408717B1
EP1408717B1 EP03255099A EP03255099A EP1408717B1 EP 1408717 B1 EP1408717 B1 EP 1408717B1 EP 03255099 A EP03255099 A EP 03255099A EP 03255099 A EP03255099 A EP 03255099A EP 1408717 B1 EP1408717 B1 EP 1408717B1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
resonant panel
diaphragm
unit according
panel
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
EP03255099A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1408717A2 (en
EP1408717A3 (en
Inventor
Mark Dodd
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.)
KH Technology Corp
Original Assignee
KH Technology Corp
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 GBGB0219245.8A external-priority patent/GB0219245D0/en
Priority claimed from GB0317445A external-priority patent/GB0317445D0/en
Application filed by KH Technology Corp filed Critical KH Technology Corp
Publication of EP1408717A2 publication Critical patent/EP1408717A2/en
Publication of EP1408717A3 publication Critical patent/EP1408717A3/en
Application granted granted Critical
Publication of EP1408717B1 publication Critical patent/EP1408717B1/en
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
    • 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 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • 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 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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
    • H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
    • H04R2440/07—Loudspeakers using bending wave resonance and pistonic motion to generate sound
    • 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 present invention relates to loudspeaker units, and particularly for use In "home cinema” applications.
  • surround sound loudspeakers are located behind and/or to the side of the viewer and generally comprise two pistonic diaphragm drivers operating out of phase in order to produce a "figure-of-eight" dipole acoustic radiation directivity characteristic (the drivers may be in phase at base frequencies, or there may be a separate low frequency driver in the enclosure).
  • pistonic surround sound loudspeakers suffer from the disadvantages that they tend to be expensive, and generally do not produce an entirely convincing ambient sound profile for the listener.
  • German patent application DE 19955867 A1 discloses a flat loudspeaker system for bass reproduction.
  • the system comprises a flat, non-radiative housing having a front opening and enclosing a housing volume, a plate membrane inside the front opening, and a bass transducer attached to the housing and/or to the plate membrane in such a way that the membrane forms a part of the outer wall of the housing.
  • the present invention seeks to provide a new type of loudspeaker unit suitable for five channel super audio compact disc (SACD) and/or suitable for creating surround sound reproduction, for example for home cinema applications.
  • SACD super audio compact disc
  • the present invention particularly seeks to avoid the need for separate surround sound loudspeakers located behind the viewer of a home cinema system.
  • the present invention is not limited to SACD or home cinema applications, or to surround sound in general, although such applications will be particularly suited to the present invention.
  • a first aspect of the present invention provides a loudspeaker unit comprising, in combination, a pistonically driven diaphragm loudspeaker (i.e., a loudspeaker in which a diaphragm moves in a piston-like motion as a generally rigid whole for at least part of its operating frequency range) and a generally planar resonant panel loudspeaker, characterised in that the resonant panel is retained in place with respect to the pistonically driven diaphragm loudspeaker in an orientation such that an axis along which the diaphragm is pistonically driven lies substantially in the plane of the resonant panel.
  • a pistonically driven diaphragm loudspeaker i.e., a loudspeaker in which a diaphragm moves in a piston-like motion as a generally rigid whole for at least part of its operating frequency range
  • a generally planar resonant panel loudspeaker characterised in that the resonant panel is retained in place with respect to
  • the resonant panel loudspeaker is located relative to the pistonically driven diaphragm loudspeaker (hereinafter the "diaphragm loudspeaker") such that the emission of the acoustic radiation from the diaphragm loudspeaker is substantially unimpeded by the resonant panel loudspeaker.
  • the resonant panel may be located above, below or behind the diaphragm loudspeaker. Most preferably the panel is located behind the diaphragm loudspeaker.
  • the resonant panel loudspeaker is arranged to radiate sound from both opposite major surfaces of the panel simultaneously.
  • the present invention has the advantage that by orientating the axis of the pistonically driven diaphragm loudspeaker so that it lies substantially in the plane of the resonant panel loudspeaker, the resonant panel loudspeaker normally produces a generally "figure-of-eight" acoustic radiation pattern by radiating sound from both opposite major surfaces of the panel with the "null" of the radiation pattern generally coincident with the axis of the diaphragm loudspeaker. Consequently, the use of a resonant panel loudspeaker in this orientation produces the type of acoustic radiation pattern generally required of surround sound.
  • resonant panel loudspeakers tend to produce diffuse acoustic radiation, which is ideal for surround sound. These two characteristics in combination mean that the resonant panel loudspeaker of the loudspeaker unit according to the present invention generally provides an extremely effective surround sound loudspeaker system.
  • the loudspeaker unit according to the present invention combines such a surround sound loudspeaker with a diaphragm loudspeaker (which preferably operates as a monopole) has the tremendous advantage that separate surround sound loudspeakers situated behind the viewer/listener can be dispensed with, and instead one or more (preferably a pair) of loudspeaker units according to the present invention situated adjacent to (or as part of) the television (or other home cinema screen) will provide both imaged sound and surround sound.
  • a second aspect of the present invention provides the use of two loudspeaker units according to the first aspect of the present invention, to provide both surround sound reproduction and stereophonic sound reproduction simultaneously.
  • the resonant panel loudspeakers preferably provide the surround sound reproduction and the pistonically driven diaphragm loudspeakers preferably provide the stereophonic sound reproduction.
  • a third aspect of the present invention provides an audio-visual system comprising a visual display means and at least one (but preferably two) loudspeaker unit(s) according to the first aspect of the present invention.
  • the audio-visual system is a home cinema (or home entertainment) system.
  • the visual display means comprises a television set.
  • the visual display means and the loudspeaker unit(s) may be combined in a single unit.
  • FIG. 1 shows, schematically, a loudspeaker unit 10 according to an embodiment of the present invention, comprising a resonant panel loudspeaker 1 and a diaphragm loudspeaker 7.
  • the example resonant panel loudspeaker 1 comprises a generally planar resonant panel 3 having exciters 5 attached thereto.
  • the exciters 5 are the drivers of the resonant panel loudspeaker 1, and cause the panel 3 to resonate and thereby to emit acoustic radiation.
  • the exciter(s) 5 may generally comprise any type of transducer, for example electromagnetic (e.g. moving coil), piezoelectric, or electrostatic.
  • the panel 3 itself may be formed from any of a wide variety of materials, for example polymeric materials and/or glass fibre materials and/or carbon fibre materials and/or cardboard (or the like).
  • the panel 3 may comprise a single sheet of material a plurality of layers (or other composite construction) and/or may include a core, for example of honeycomb or foam construction.
  • the panel 3 is substantially planar (i.e. a generally thin and flat panel). This has the advantage that the acoustic radiation patterns which emanate from each major surface of the panel 3 may be substantially the same as each other (thereby, for example, enhancing the diffuse surround sound nature of the sound reproduction).
  • Resonant panel loudspeakers are often termed “distributed-mode” loudspeakers (DMLs) because they generally function by exciting a plurality of vibrational modes distributed throughout the panel (the panel generally operating wholly in resonance).
  • the resonant panel loudspeaker may, for example, be substantially as described in international patent publication no. WO9709842.
  • the terms “pistonic loudspeaker” and “pistonically driven diaphragm loudspeaker” in this specification refer to a loudspeaker in which a diaphragm moves in a piston-like motion as a generally rigid whole for at least part of its operating frequency range (for example up to approximately 700 Hz).
  • the example pistonically driven diaphragm loudspeaker 7 comprises a generally conical diaphragm 9 and a driver 11 for the diaphragm 9.
  • the driver 11 can be an electro-mechanical transducer, e.g. a moving coil transducer, but other types of drivers can also be used.
  • the pistonically driven diaphragm loudspeaker 7 preferably provides imaged sound reproduction (whereas the resonant panel loudspeaker 1 preferably provides diffuse surround sound reproduction). Most preferably, the diaphragm loudspeaker 7 functions as a monopole acoustic source (and preferably the resonant panel loudspeaker 1 functions as a diffuse dipole acoustic source). The diaphragm loudspeaker 7 preferably emits the acoustic output of the left/right signal of the stereophonic source.
  • two loudspeaker units 10 are used by a listener (or viewer of a home cinema system), with each of the two diaphragm loudspeakers 7 of the two units 10 emitting imaged stereophonic acoustic radiation and the two resonant panel loudspeakers 1 emitting diffuse (non-imaged) surround sound acoustic radiation.
  • the plane of the resonant panel 3 lies in the same orientation as the axis A-A along which the diaphragm 9 is pistonically driven.
  • the axis A-A lies in the same plane as the resonant panel 3.
  • the resonant panel loudspeaker 1 is located relative to the pistonically driven diaphragm loudspeaker 7 such that the emission of the acoustic radiation from the diaphragm loudspeaker 7 is substantially unimpeded by the resonant panel loudspeaker 1.
  • the resonant panel loudspeaker 1 may be located above, below or behind the diaphragm loudspeaker 7.
  • the resonant panel speaker 1 is located behind the diaphragm loudspeaker 7.
  • the resonant panel 3 is located to the rear of the diaphragm loudspeaker 7, so that the directional acoustic output (as indicated by arrow D) of the diaphragm loudspeaker 7 is unimpeded by the resonant panel loudspeaker 1.
  • the acoustic output of the resonant panel loudspeaker 1 is indicated by arrows R.
  • the output of the resonant panel 3 is generally perpendicular to that of the diaphragm 9.
  • the output of the resonant panel 3 is diffuse and in the form of dipole with the "null" centred on the axis A-A of the diaphragm loudspeaker 7.
  • the null of the diffuse dipole of the resonant panel loudspeaker 1 will generally be centred on the listener/viewer, if the diaphragm loudspeaker 7 is directed towards the listener/viewer, and the output of the resonant panel 3 will be perceived as ambient surround sound despite the fact that loudspeaker units will normally be located only in front of the listener/viewer.
  • the resonant panel loudspeaker 1 is arranged to radiate sound from both opposite major surfaces of the panel 3 simultaneously.
  • a loudspeaker unit 10 according to the present invention has the advantage that by orientating the plane of the resonant panel loudspeaker 1 so that it is in generally the same orientation as the axis of the pistonically driven diaphragm loudspeaker 7 the resonant panel loudspeaker 1 normally produces a generally "figure-of-eight" acoustic radiation pattern by radiating sound from both opposite major surfaces of the panel 3 with the "null" of the radiation pattern generally coincident with the axis of the diaphragm 9 loudspeaker 7.
  • resonant panel loudspeaker 1 in this orientation produces the type of acoustic radiation pattern generally required of surround sound. Additionally, and most advantageously, resonant panel loudspeakers tend to produce diffuse acoustic radiation, which is ideal for surround sound. These two characteristics in combination mean that the resonant panel loudspeaker 1 of the loudspeaker unit 10 according to the present invention generally provides an extremely effective surround sound loudspeaker system.
  • the loudspeaker unit 10 according to the present invention combines such a surround sound loudspeaker 1 with a diaphragm loudspeaker 7 (which preferably operates as a monopole) has the tremendous advantage that separate conventional surround sound loudspeakers situated behind the viewer/listener can be dispensed with, and instead one or more (preferably a pair) of loudspeaker units 10 according to the present invention situated adjacent to (or as part of) the television (or other home cinema screen) will provide both imaged sound and surround sound, as described further below in relation to Figure 2.
  • FIG 2 is a schematic plan view of an example home cinema system 12 according to the present invention.
  • the system 12 comprises a television set 13 (or other visual display means) and two loudspeaker units according to the present invention, such as the loudspeaker units 10 shown in Figure1.
  • the loudspeaker units 10 are located on either side of the television 13 and orientated such that their diaphragm loudspeakers 7 are directed towards the listener/viewer 15.
  • this arrangement creates the perception of ambient surround sound for the viewer/listener, despite the loudspeakers 10 being situated only in front (and not to the rear or side) of the viewer/listener.
  • the arrangement also creates imaged stereophonic sound, due to the directional monopole diaphragm loudspeakers.
  • Each loudspeaker unit 10 may comprise more than one pistonically driven diaphragm loudspeaker 7 and/or more than one resonant panel loudspeaker 1.
  • the function of the pistonic loudspeaker 7 may be carried out by a plurality of pistonic loudspeakers (e.g. with each such loudspeaker dedicated to a respective frequency range).
  • the pistonically driven diaphragm loudspeaker 7 may, for example, comprise a compound loudspeaker of the type disclosed in United States Patent No. 5,548,657.
  • a loudspeaker unit 10 further comprises an enclosure in which the resonant panel loudspeaker 1 and the diaphragm loudspeaker 7 are housed.
  • Figure 3 is an exploded diagram of a preferred embodiment of a loudspeaker unit 14 according to the present invention.
  • the loudspeaker unit 14 comprises a resonant panel loudspeaker 1 comprising a resonant panel 3 with an exciter 5 (in the form of an electro-mechanical transducer) attached thereto, and a pistonically driven diaphragm loudspeaker 7.
  • the diaphragm loudspeaker 7 comprises a diaphragm 9 and a driver 11.
  • the example pistonically driven diaphragm loudspeaker 7 illustrated in Figure 3 can be a compound loudspeaker of the type disclosed in United States Patent No. 5,548,657.
  • the compound diaphragm loudspeaker 7 comprises a low frequency part having the generally conical diaphragm 9 shown, and a high frequency part having a generally dome-shaped diaphragm (not shown) located in or adjacent to the neck of the conical diaphragm 9.
  • the loudspeaker unit 14 shown in Figure 3 also includes an enclosure 17 in which the resonant panel loudspeaker 1 and the diaphragm loudspeaker 7 are housed.
  • the enclosure 17 comprises a plurality of sections, or panels, assembled together around the loudspeakers 1 and 7.
  • the enclosure 17 comprises two side panels 17a and 17b, a front panel 17c, and a rear panel 17d.
  • the various panels have gaskets (or other seals) 19 situated between them, to seal the enclosure.
  • the gaskets (or other seals) 19 may, for example, be formed from polymeric foam or other polymeric sealing material.
  • the resonant panel 3 is retained in place in the enclosure 17 by means of an adhesive pad 21 (and/or by means of adhesive tape, not shown).
  • the enclosure 17 comprises two main parts.
  • a first part 23 of the enclosure 17 encloses (preferably fully encloses) the pistonically driven diaphragm loudspeaker 7 other than by the front panel 17c that includes openings 25 through which the forwardly-directed acoustic radiation emitted by the diaphragm loudspeaker 7 is arranged to propagate.
  • a second part 27 retains the resonant panel loudspeaker 1 but is open on opposite major sides thereof adjacent to the opposite major sides of the resonant panel 3, to allow the sidewardly directed acoustic radiation emitted by the resonant panel loudspeaker 1 to propagate substantially freely from the unit.
  • the (or each) exciter 5 is protected by means of small enclosure elements 29 located within the open sides of the second part 27 of the enclosure.
  • a lead 31 is connectable to both loudspeakers 1, 7 of the unit 14 via terminal pins 33.
  • the present invention provides a novel loudspeaker unit suitable for e.g. five channel super audio compact disc (SACD) and/or suitable for creating surround sound reproduction, for example for home cinema applications.
  • SACD super audio compact disc
  • the present invention particularly avoids the need for separate surround sound loudspeakers located behind the viewer of a home cinema system.
  • the present invention is not limited (at least in its broadest aspects) to SACD or home cinema applications, or to surround sound in general, although such applications will be particularly suited to the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (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)
  • Stereophonic Arrangements (AREA)
  • Pinball Game Machines (AREA)
EP03255099A 2002-08-17 2003-08-18 Combination loudspeaker unit Expired - Lifetime EP1408717B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB0219245.8A GB0219245D0 (en) 2002-08-17 2002-08-17 Combination loudspeaker unit
GB0219245 2002-08-17
GB0317445 2003-07-25
GB0317445A GB0317445D0 (en) 2003-07-25 2003-07-25 Combination loudspeaker unit

Publications (3)

Publication Number Publication Date
EP1408717A2 EP1408717A2 (en) 2004-04-14
EP1408717A3 EP1408717A3 (en) 2004-08-04
EP1408717B1 true EP1408717B1 (en) 2006-03-01

Family

ID=28456042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03255099A Expired - Lifetime EP1408717B1 (en) 2002-08-17 2003-08-18 Combination loudspeaker unit

Country Status (7)

Country Link
EP (1) EP1408717B1 (es)
AT (1) ATE319279T1 (es)
DE (1) DE60303748T2 (es)
DK (1) DK1408717T3 (es)
ES (1) ES2260580T3 (es)
GB (1) GB2392043B (es)
PT (1) PT1408717E (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425675B (en) * 2005-04-28 2008-07-23 Gp Acoustics Audio system
EP1814354B1 (en) * 2006-01-30 2017-04-26 Sony Corporation Speaker
GB0603545D0 (en) * 2006-02-22 2006-04-05 Fletcher Edward S Apparatus and method for reproduction of stereo sound
GB0723920D0 (en) 2007-12-06 2008-01-16 Airsound Llp An improved apparatus and method for reproduction of stereo sound
DE102008016703A1 (de) 2008-03-31 2009-10-01 Joachim Gerhard Gekreuzte Schallwand

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291251A (en) * 1966-03-14 1966-12-13 Stanley A Strzelecki Sr Divided panel board for hi-fi speaker systems
DE3904943A1 (de) * 1989-02-17 1990-09-20 Pfleiderer Peter Lautsprecheranordnung zur verbesserung des akustischen klangeindrucks in wohnraeumen
KR19990037724A (ko) * 1995-09-02 1999-05-25 헨리 에이지마 인사카드 및 그 유사카드
GB9910220D0 (en) * 1999-04-29 1999-06-30 New Transducers Ltd Loudspeakers
DE19955867A1 (de) * 1999-11-22 2001-06-21 Harman Audio Electronic Sys Flachlautsprecheranordnung für Tieftonwiedergabe
DE20002930U1 (de) * 2000-02-20 2000-05-18 Theis Karl Heinz Hornlautsprecher
GB2368484B (en) * 2000-10-25 2004-06-16 B & W Loudspeakers Distributed mode panel type loudspeakers
US7002070B2 (en) * 2001-06-22 2006-02-21 Shelley Katz Electronic piano
KR20100063142A (ko) * 2003-01-22 2010-06-10 월드렙주식회사 사운드 생성을 위한 장치 및 방법

Also Published As

Publication number Publication date
ATE319279T1 (de) 2006-03-15
DK1408717T3 (da) 2006-07-10
ES2260580T3 (es) 2006-11-01
EP1408717A2 (en) 2004-04-14
PT1408717E (pt) 2006-07-31
DE60303748T2 (de) 2006-11-09
GB2392043A (en) 2004-02-18
GB2392043B (en) 2006-03-22
GB0319297D0 (en) 2003-09-17
DE60303748D1 (de) 2006-04-27
EP1408717A3 (en) 2004-08-04

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