GB2500022A - Array centres aligned transducer arrangement for line source loudspeakers - Google Patents
Array centres aligned transducer arrangement for line source loudspeakers Download PDFInfo
- Publication number
- GB2500022A GB2500022A GB201203950A GB201203950A GB2500022A GB 2500022 A GB2500022 A GB 2500022A GB 201203950 A GB201203950 A GB 201203950A GB 201203950 A GB201203950 A GB 201203950A GB 2500022 A GB2500022 A GB 2500022A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mid
- line
- waveguide
- loudspeaker
- line source
- 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- Withdrawn
Links
- 230000006835 compression Effects 0.000 claims abstract description 7
- 238000007906 compression Methods 0.000 claims abstract description 7
- 238000003491 array Methods 0.000 claims abstract description 5
- 230000004044 response Effects 0.000 claims abstract description 3
- 230000000295 complement effect Effects 0.000 claims 1
- 230000010354 integration Effects 0.000 claims 1
- 230000011514 reflex Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- 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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
-
- 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
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
-
- 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
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
-
- 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
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
- H04R2201/403—Linear arrays of transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/13—Use or details of compression drivers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The loudspeaker is constructed of two adjacent vertical arrays of differing length. The low/mid frequencies are reproduced using a conventional vertical line of cone loudspeakers A. Mounted adjacent to the conventional vertical line of loudspeakers is a shorter vertical line of horn waveguide mounted compression drivers B mounted with their horizontal centre line in alignment with the horizontal centre line of the low/mid frequency line source. The waveguide design is such that the radiated pattern is close to the radiated pattern of the conventional low/mid line source in the mid/high crossover region. The horizontal directivity of the high frequency waveguide is designed to integrate seamlessly with the vertical line of cone loudspeakers. The resultant combination delivers an integrated performance with extended frequency response allowing the benefits of the line source principle to cover the frequency range from 100Hz to 16kHz at higher sound pressure levels. Reflex tuning ports C may also be included. Fig 2 shows other arrangements.
Description
1
New Transducer Arrangement for Line Source Loudspeakers.
Background of the Invention:
1. Field of the invention.
This invention relates to Line Source Loudspeakers of compact dimensions intended for high power applications. Conventional Line Source Loudspeakers are used for predominantly 'voice or speech' applications and the purpose of this development is to provide increased capability in the frequency range 100Hz -16kHz.
2. Description of the Prior Art.
Prior designs have not used horn waveguide mounted compression drivers mounted adjacent to conventional mid/bass line source arrangements using conventional cone loudspeaker drivers where the lengths of each of the transducer arrays are different. It is believed that the first line source loudspeakers for commercial use were installed at White City Stadium in 1933. (Ref: The Line source Loudspeaker and its Applications by Paul H Taylor A.M.I.E.E.) A uniformly excited line source loudspeaker provides a comparatively sharp main beam and can 'fire sound over a great distance'.
Summary of the Invention:
It is an object of the invention to provide a sound projection system of reduced size with respect to the prior art systems and of improved sound quality and high sound pressure capability.
This development relates to a novel loudspeaker constructed of two adjacent vertical arrays of differing length.
The established 'Line Source' configuration yields superior performance in difficult listening space conditions.
2
Ideal Line Source Loudspeakers create a cylindrical wave-front in the near field. This results in a 3dB drop in SPL per doubling of distance. This is due to the generated wave-front producing curvature only in the horizontal axis, whilst being planar in the vertical axis.
The inventions comprise a number of loudspeaker enclosures containing various numbers of loudspeaker drive units in various number vertical arrangements with integral adjacent horn waveguide mounted compression drivers to produce integrated loudspeakers of high sound pressure level capability.
The complete loudspeaker according to the invention provides an integrated frequency response with the waveguide characteristics designed to match the characteristics of the conventional mid/bass line source loudspeaker in the crossover frequency region.
The lateral 'cut-off' and directivity of the high frequency waveguide is so designed to prevent any lateral interference effects in the crossover region which would otherwise prevent the asymmetric location of the horn waveguide assembly.
The element size of the HF component is small. For adequately planar wave-fronts in the vertical axis the depth of the high frequency waveguide is small. These elements of the design result in a compact speaker enclosure.
The width of the HF wave-guide is a balance between intrinsic horizontal directivity and the minimisation of horizontal lobing. This yields an improved and more uniform control of the combined assembly.
The vertical 'cut-off' of the high frequency waveguide is designed to match the vertical characteristics of the conventional mid/bass line source loudspeaker.
In order to maximise the capability of the loudspeaker enclosures, tuning ports are incorporated to extend the low frequency performance of each loudspeaker.
Brief Description of the Drawings:
The invention will be described by way of example with reference to the accompanying drawings where:
Figure 1 is a diagrammatic view of a single line source loudspeaker embodying the invention and:
3
Figure 2 is a diagrammatic view of several line source loudspeakers incorporating various numbers of cone loudspeaker drive units and multiple horn waveguide mounted compression drivers.
Referring to Figure 1 there is illustrated in (A) a conventional 6 driver vertical arrangement of cone loudspeakers providing low/mid frequency acoustical output, according to established convention.
Adjacent to the cone loudspeaker line source arrangement is a horn waveguide comprising of a number of compression drivers (B) mounted close to the conventional cone loudspeaker array with its horizontal centre line in alignment with the horizontal centre line of the cone loudspeaker array.
The element size of the HF component is small as is the depth which results in a compact loudspeaker enclosure.
The compact enclosure (D) has frequency tuning ports (C) incorporated to extend the low frequency capability of the complete loudspeaker.
4
KEY FOR FIGURE 1
A. Conventional Mid/Bass Line Source using cone loudspeakers. 8. Shorter Vertical Line of Horn Waveguide mounted compression drivers
C. Low frequency tuning ports to extend tow frequency performance of f^kl/Bass Line Source,
D. Compact Enclosure,
5
Claims (7)
1. The loudspeaker described is unique in that it incorporates two adjacent vertical transducer arrays, one for mid/bass frequencies (typically 100Hz - 1700Hz) and a second shorter horn waveguide mounted compression driver array for high frequencies (typically 1700Hz-16kHz). The HF array is mounted so that its horizontal centre line is located on the horizontal centre line of the mid/bass transducer array.
2. The horn waveguide design is such that the radiated pattern is complementary to the radiated pattern of the conventional low/mid line source in the mid/high frequency cross-over region. This results in the seamless integration of the two vertical transducer arrays.
3. The width of the high frequency waveguide is a balance between intrinsic horizontal directivity and the minimisation of horizontal lobing.
4. The element size of the high frequency component is small.
5. For adequately planar wave-fronts in the vertical axis the depth of the high frequency waveguide is small.
6. These elements of the design result in a compact loudspeaker enclosure when compared to prior art.
7. The loudspeaker enclosure incorporated tuning ports to extend the low frequency response of the complete loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201203950A GB2500022A (en) | 2012-03-06 | 2012-03-06 | Array centres aligned transducer arrangement for line source loudspeakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201203950A GB2500022A (en) | 2012-03-06 | 2012-03-06 | Array centres aligned transducer arrangement for line source loudspeakers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201203950D0 GB201203950D0 (en) | 2012-04-18 |
| GB2500022A true GB2500022A (en) | 2013-09-11 |
Family
ID=46003218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB201203950A Withdrawn GB2500022A (en) | 2012-03-06 | 2012-03-06 | Array centres aligned transducer arrangement for line source loudspeakers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2500022A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098055A (en) * | 2016-08-11 | 2016-11-09 | 广州励丰文化科技股份有限公司 | A kind of waveguide device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3308237A (en) * | 1963-05-31 | 1967-03-07 | Muter Company | Columnar loudspeaker system |
| JPH04170299A (en) * | 1990-11-02 | 1992-06-17 | Matsushita Electric Ind Co Ltd | Directivity control speaker system |
| WO1998007297A1 (en) * | 1996-08-09 | 1998-02-19 | Blodget Clifford L | Line array |
| US6628793B1 (en) * | 1999-01-06 | 2003-09-30 | Mark G. Porzilli | Speaker system |
| JP2008134422A (en) * | 2006-11-28 | 2008-06-12 | Yamaha Corp | Karaoke device |
-
2012
- 2012-03-06 GB GB201203950A patent/GB2500022A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3308237A (en) * | 1963-05-31 | 1967-03-07 | Muter Company | Columnar loudspeaker system |
| JPH04170299A (en) * | 1990-11-02 | 1992-06-17 | Matsushita Electric Ind Co Ltd | Directivity control speaker system |
| WO1998007297A1 (en) * | 1996-08-09 | 1998-02-19 | Blodget Clifford L | Line array |
| US6628793B1 (en) * | 1999-01-06 | 2003-09-30 | Mark G. Porzilli | Speaker system |
| JP2008134422A (en) * | 2006-11-28 | 2008-06-12 | Yamaha Corp | Karaoke device |
Non-Patent Citations (2)
| Title |
|---|
| The Absolute Sound, Issue 165, October 2006, "The Nola Grand Reference Mk. VI" * |
| The Absolute Sound, Issue 205, September 2010, "Nola Baby Grand Reference Loudspeaker" * |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201203950D0 (en) | 2012-04-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |