CA2617105A1 - Coaxial line source loudspeaker - Google Patents
Coaxial line source loudspeaker Download PDFInfo
- Publication number
- CA2617105A1 CA2617105A1 CA 2617105 CA2617105A CA2617105A1 CA 2617105 A1 CA2617105 A1 CA 2617105A1 CA 2617105 CA2617105 CA 2617105 CA 2617105 A CA2617105 A CA 2617105A CA 2617105 A1 CA2617105 A1 CA 2617105A1
- Authority
- CA
- Canada
- Prior art keywords
- midbass
- loudspeaker
- driver
- high frequency
- acoustic
- 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.)
- Abandoned
Links
- 239000010409 thin film Substances 0.000 claims abstract description 4
- 239000010408 film Substances 0.000 claims description 4
- 230000005404 monopole Effects 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 description 7
- 230000001427 coherent effect Effects 0.000 description 4
- 235000009508 confectionery Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003491 array Methods 0.000 description 3
- 235000019640 taste Nutrition 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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
- H04R1/32—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
- 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
- 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
- H04R2201/401—2D or 3D 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
- 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
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
A coaxial line array loudspeaker including a plurality of midbass acoustical drivers with an elongated thin film diaphragm high frequency acoustical driver centred in front of the midbass driver array.
Description
The rear of the high frequency element can be formed (23) to minimize reflections from the wave produced by the low frequency element and to allow the inset (24) of the support tube (25) It can be swivelled and raised and lowered to offer the maximum flexibility in positioning for producing the ideal response in a variety of rooms and to suit individual listener tastes A coaxial line source loudspeaker (15) with a monopolar thin film elongated diaphragm (16) (ribbon or electrostatic transducer), placed directly in front of the low frequency transducer line array, has the following advantages it is phase coherent horizontally and vertically it has extremely even horizontal dispersion it has very limited vertical dispersion it minimizes baffle bounce since the high trequency driver is located ahead of the baffle of the midbass drivers (17) and any high frequency sound reaching the midbass baffle will have very low energy.
- diffraction will be minimized by the small size relative to the wavelengths being produced and contoured shape of the high frequency drivers baffle (front plate).
- it offers greater fidelity in a larger area of listening space than any other loudspeaker configuration The sole acoustic drawback of this innovation is depth displacement (time alignment shift) (18) of the higher frequencies caused by placing the High Frequency driver ahead of the midbass driver. This kind of timing distortion is of small audible significance and can be corrected 100% in the electronic domain by means of a delay placed on the midbass drivers (19). This will yield a loudspeaker which will be 100% phase coherent over most of the listening space A large Ribbon driver (19) with a long narrow film diaphragm (26) eliminates the multitude of nodes and cancellations inherent in a line array of small high frequency drivers for example 1" dome tweeters (20) with widely separated small diaphragms The monopole (sealed back) Ribbon (19) is a necessity to avoid excitation and distortion of the high frequency diaphragm by strong low frequency waves created by the midbass drivers directly behind it.
The height (21) and rotation (22) adjustment capability of the high frequency Ribbon structure allows exceptionally easy fine tuning of the sound radiating pattern of the speaker to ideally balance direct and reflected sound to suit the room environment and the listeners' taste.
A line source array produces a pattern of dispersion that effectively extends the "near field" response ie the response of the loudspeaker before it is affected by interaction with the room further into the listening area. The distance the near field effect is projected depends on the length of the effective diaphragm and the frequency it is reproducing.
Linear or line source arrays have much more controlled vertical dispersion (7) and therefore excite fewer detrimental room interactions but as implemented have introduced several other deficiencies of their own. These deficiencies stem from the alignment on the same plane of the drivers in 2 or more vertical parallel lines each other (8). By placing radiating surfaces beside each other, the waves (9) created by them will arrive at different horizontal points in the room at slightly different times causing many amplitude and phase anomalies which degrade the perceived accuracy of the music.
Only in one very narrow area are these anomalies minimized giving rise to the term "head-in-a-vice sweet spot". (Fig 4) Slight movement of the head produces distinctly different audible performance.
The horizontal area where these effects are minimal is quite small ('10) and small movement of the listener's body or even just the head will produce audible degradation of the musical experience. This also precludes more than one listener from enjoying ideal response. Conventional wide dispersion speakers have a wider (11) sweet spot and the coaxial line source configuration offers an exceptionally large sweet spot (12).
For conventional or parallel line source loudspeakers, phase anomalies due to the physical offset of the drivers cannot be corrected over a large listening area by electrical means. A coaxial line source holds much higher potential for delivering phase and frequency response accuracy over a large area in any listening space.
Besides phase differentials, other causes of these anomalies include baffle bounce (13) and diffraction (14). Baffle bounce occurs when a wave from a driver (typically high frequency) radiates to the side of the driver and "bounces" off of the baffle or the diaphragms of other adjacent drivers. Diffraction occurs when the sound wave encounters a radical change in the baffle surface along which it is radiating -either a corner of a loudspeaker enclosure or the edge of a panel speaker.
Description A loudspeaker is constructed with multiple vertical arrays of drivers. The low frequency element is a linear array of similar transducers aligned vertically or large, narrow rectangular film driver. The high frequency element is a monopole transducer placed directly in front of the low frequency element yielding a horizontally and vertically phase coherent loudspeaker. This line source array configuration yields superior performance in minimizing the degrading effects of listening space acoustics. The coaxial alignment eliminates the horizontal nodes and cancellations commonly referred to as comb filters, which are inherent in conventional line source (multiple transducers in a linear array or single long, narrow transducer) designs where the high frequency and low frequency elements are placed side by side.
Initial Description A loudspeaker is constructed with multiple vertical arrays of drivers. The_ low frequency element is a linear array of transducers aligned vertically or large, rectangular film driver. The high frequency element is a monopole ribbon transducer placed directly in front of the low frequency element yielding a horizontally and vertically phase coherent loudspeaker. This line source array configuration yields superior performance in minimizing the degrading effects of listening space acoustics. The coaxial alignment eliminates the horizontal nodes (comb filters) which are inherent in conventional line source (multiple transducers in a linear array or single long, narrow transducer) designs where the high frequency and low frequency elements are placed side by side.
The high frequency element is formed to minimize reflections from the wave produced by the low frequency element and it can be swivelled and raised and lowered to offer the maximum flexibility in positioning for producing the ideal response in a variety of rooms and to suit individual listener tastes.
Background of the Invention Music reproduction whether in the home or in larger public venues is degraded by the acoustic effects of the physical space (room; Reflections and standing waves distort the accuracy for the listeners of the sound produced initially at the diaphragm by the loudspeakers Control and minimization of room effects is one of the critical frontiers of music reproduction. Delivering the soundwave faithfully to the listener's ears in a typical listening environment is the objective of this development The ideal loudspeaker would deliver consistent, accurate, high quality sound to any point in the listening space. This invention delivers consistent, high quality sound to a larger portion of the listening space than has been possible before.
The innovation described here is inherently free from the flaws of conventional and past designs and incorporates features which allow a large area, where very superior reproduction can be enjoyed, to be quickly established in many different rooms for many different listeners This innovation removes previous drawbacks and makes it possible for a much higher level of fidelity to be achieved in a vide variety and sizes of listening spaces. This configuration can be scaled up or down to properly match a space or dynamic requirement with no ill effects The traditional loudspeaker consists of a larger cone diaphragm bass transducer (1 possibly a cone or dome midrange (2) and a cone or dome (3) high frequency tweeter This configuration has a number of significant acoustic drawbacks in its ability to deliver the soundwave that the separate drivers create faithfully through the acoustic space to the listeners ear. The overlapping hemispherical dispersion patterns (4) of conventional loudspeakers using small round diaphragms assure that large numbers of room resonances are excited and that reflected sound arrives at the listeners ear from many different sources at different times to degrade the integrity of the original wave created at the diaphragm Line source loudspeakers (5) have either an elongated rectangular thin film diaphragm or a plurality of identical transducers (6) reproducing the same frequency range Hence the resultant dispersion pattern (7) duplicates that of a single diaphragm of a height ano width equal to the overall dimensions of the array List of Diagrams Figure 1 : coaxial line source , height and rotational adjustability Figure 2 :radiation patterns of conventional speakers, parallel line source speakers and single line source speakers Figure 3 :height and rotational adjustability pictures and shapes of high frequency Ribbon drivers Figure 4 sweet spot areas Figure 5 electronic phase correction. baffle bounce, diffraction, dome line source radiatior
- diffraction will be minimized by the small size relative to the wavelengths being produced and contoured shape of the high frequency drivers baffle (front plate).
- it offers greater fidelity in a larger area of listening space than any other loudspeaker configuration The sole acoustic drawback of this innovation is depth displacement (time alignment shift) (18) of the higher frequencies caused by placing the High Frequency driver ahead of the midbass driver. This kind of timing distortion is of small audible significance and can be corrected 100% in the electronic domain by means of a delay placed on the midbass drivers (19). This will yield a loudspeaker which will be 100% phase coherent over most of the listening space A large Ribbon driver (19) with a long narrow film diaphragm (26) eliminates the multitude of nodes and cancellations inherent in a line array of small high frequency drivers for example 1" dome tweeters (20) with widely separated small diaphragms The monopole (sealed back) Ribbon (19) is a necessity to avoid excitation and distortion of the high frequency diaphragm by strong low frequency waves created by the midbass drivers directly behind it.
The height (21) and rotation (22) adjustment capability of the high frequency Ribbon structure allows exceptionally easy fine tuning of the sound radiating pattern of the speaker to ideally balance direct and reflected sound to suit the room environment and the listeners' taste.
A line source array produces a pattern of dispersion that effectively extends the "near field" response ie the response of the loudspeaker before it is affected by interaction with the room further into the listening area. The distance the near field effect is projected depends on the length of the effective diaphragm and the frequency it is reproducing.
Linear or line source arrays have much more controlled vertical dispersion (7) and therefore excite fewer detrimental room interactions but as implemented have introduced several other deficiencies of their own. These deficiencies stem from the alignment on the same plane of the drivers in 2 or more vertical parallel lines each other (8). By placing radiating surfaces beside each other, the waves (9) created by them will arrive at different horizontal points in the room at slightly different times causing many amplitude and phase anomalies which degrade the perceived accuracy of the music.
Only in one very narrow area are these anomalies minimized giving rise to the term "head-in-a-vice sweet spot". (Fig 4) Slight movement of the head produces distinctly different audible performance.
The horizontal area where these effects are minimal is quite small ('10) and small movement of the listener's body or even just the head will produce audible degradation of the musical experience. This also precludes more than one listener from enjoying ideal response. Conventional wide dispersion speakers have a wider (11) sweet spot and the coaxial line source configuration offers an exceptionally large sweet spot (12).
For conventional or parallel line source loudspeakers, phase anomalies due to the physical offset of the drivers cannot be corrected over a large listening area by electrical means. A coaxial line source holds much higher potential for delivering phase and frequency response accuracy over a large area in any listening space.
Besides phase differentials, other causes of these anomalies include baffle bounce (13) and diffraction (14). Baffle bounce occurs when a wave from a driver (typically high frequency) radiates to the side of the driver and "bounces" off of the baffle or the diaphragms of other adjacent drivers. Diffraction occurs when the sound wave encounters a radical change in the baffle surface along which it is radiating -either a corner of a loudspeaker enclosure or the edge of a panel speaker.
Description A loudspeaker is constructed with multiple vertical arrays of drivers. The low frequency element is a linear array of similar transducers aligned vertically or large, narrow rectangular film driver. The high frequency element is a monopole transducer placed directly in front of the low frequency element yielding a horizontally and vertically phase coherent loudspeaker. This line source array configuration yields superior performance in minimizing the degrading effects of listening space acoustics. The coaxial alignment eliminates the horizontal nodes and cancellations commonly referred to as comb filters, which are inherent in conventional line source (multiple transducers in a linear array or single long, narrow transducer) designs where the high frequency and low frequency elements are placed side by side.
Initial Description A loudspeaker is constructed with multiple vertical arrays of drivers. The_ low frequency element is a linear array of transducers aligned vertically or large, rectangular film driver. The high frequency element is a monopole ribbon transducer placed directly in front of the low frequency element yielding a horizontally and vertically phase coherent loudspeaker. This line source array configuration yields superior performance in minimizing the degrading effects of listening space acoustics. The coaxial alignment eliminates the horizontal nodes (comb filters) which are inherent in conventional line source (multiple transducers in a linear array or single long, narrow transducer) designs where the high frequency and low frequency elements are placed side by side.
The high frequency element is formed to minimize reflections from the wave produced by the low frequency element and it can be swivelled and raised and lowered to offer the maximum flexibility in positioning for producing the ideal response in a variety of rooms and to suit individual listener tastes.
Background of the Invention Music reproduction whether in the home or in larger public venues is degraded by the acoustic effects of the physical space (room; Reflections and standing waves distort the accuracy for the listeners of the sound produced initially at the diaphragm by the loudspeakers Control and minimization of room effects is one of the critical frontiers of music reproduction. Delivering the soundwave faithfully to the listener's ears in a typical listening environment is the objective of this development The ideal loudspeaker would deliver consistent, accurate, high quality sound to any point in the listening space. This invention delivers consistent, high quality sound to a larger portion of the listening space than has been possible before.
The innovation described here is inherently free from the flaws of conventional and past designs and incorporates features which allow a large area, where very superior reproduction can be enjoyed, to be quickly established in many different rooms for many different listeners This innovation removes previous drawbacks and makes it possible for a much higher level of fidelity to be achieved in a vide variety and sizes of listening spaces. This configuration can be scaled up or down to properly match a space or dynamic requirement with no ill effects The traditional loudspeaker consists of a larger cone diaphragm bass transducer (1 possibly a cone or dome midrange (2) and a cone or dome (3) high frequency tweeter This configuration has a number of significant acoustic drawbacks in its ability to deliver the soundwave that the separate drivers create faithfully through the acoustic space to the listeners ear. The overlapping hemispherical dispersion patterns (4) of conventional loudspeakers using small round diaphragms assure that large numbers of room resonances are excited and that reflected sound arrives at the listeners ear from many different sources at different times to degrade the integrity of the original wave created at the diaphragm Line source loudspeakers (5) have either an elongated rectangular thin film diaphragm or a plurality of identical transducers (6) reproducing the same frequency range Hence the resultant dispersion pattern (7) duplicates that of a single diaphragm of a height ano width equal to the overall dimensions of the array List of Diagrams Figure 1 : coaxial line source , height and rotational adjustability Figure 2 :radiation patterns of conventional speakers, parallel line source speakers and single line source speakers Figure 3 :height and rotational adjustability pictures and shapes of high frequency Ribbon drivers Figure 4 sweet spot areas Figure 5 electronic phase correction. baffle bounce, diffraction, dome line source radiatior
Claims (5)
1. A loudspeaker system comprising a linear array of at least 2 midbass acoustic drivers in an acoustic enclosure and an elongated monopole high frequency thin film diaphragm acoustic driver aligned along the centre and directly in front of the midbass line array.
2. The loudspeaker system of claim 1 with the high frequency acoustic driver mounting system which allows both vertical height adjustment to cover the full height of the midbass enclosure and rotational adjustment to allow a directional orientation of up to 60 degrees from straight ahead.
3. The loudspeaker of claim 1 where the midbass line array consists of a long narrow film diaphragm acoustical driver.
4. The loudspeaker of claim 1 consisting of a plurality of midbass enclosures each with at least 1 midbass acoustic driver stacked vertically to achieve the line source array configuration.
5. The loudspeaker of claim 1 with the rear of the high frequency driver formed to minimize reflections and interference with the sound wave produced by the midbass acoustic drivers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2617105 CA2617105A1 (en) | 2008-01-17 | 2008-01-17 | Coaxial line source loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2617105 CA2617105A1 (en) | 2008-01-17 | 2008-01-17 | Coaxial line source loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2617105A1 true CA2617105A1 (en) | 2009-07-17 |
Family
ID=40900641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2617105 Abandoned CA2617105A1 (en) | 2008-01-17 | 2008-01-17 | Coaxial line source loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2617105A1 (en) |
-
2008
- 2008-01-17 CA CA 2617105 patent/CA2617105A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |