EP2838083A2 - Akustische Linse und Lautsprechvorrichtung mit einer derartigen Linse - Google Patents

Akustische Linse und Lautsprechvorrichtung mit einer derartigen Linse Download PDF

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Publication number
EP2838083A2
EP2838083A2 EP14173122.4A EP14173122A EP2838083A2 EP 2838083 A2 EP2838083 A2 EP 2838083A2 EP 14173122 A EP14173122 A EP 14173122A EP 2838083 A2 EP2838083 A2 EP 2838083A2
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EP
European Patent Office
Prior art keywords
acoustic
lens
collector
acoustic lens
elements
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Withdrawn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
EP14173122.4A
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English (en)
French (fr)
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EP2838083A3 (de
Inventor
Angelo Camesasca
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2838083A2 publication Critical patent/EP2838083A2/de
Publication of EP2838083A3 publication Critical patent/EP2838083A3/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/30—Sound-focusing or directing, e.g. scanning using refraction, e.g. acoustic lenses
    • 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
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Definitions

  • This invention relates in general to an acoustic lens and an acoustic diffuser comprising said acoustic lens.
  • this is an acoustic lens and an acoustic diffuser able to modify the diffusion and propagation of acoustic waves with which it comes in contact.
  • acoustic lenses with work with refraction systems and/or sound wave deviation, have a structure of elements similar to one another, forming the paths for the propagation of sound waves.
  • the actual refractive index of these lenses is given by the ratio between the distance that an acoustic wave is compelled to run, through a path defined by the elements of the lens, between a point of entry and a point of exit of the chosen path and the distance that the wave would run between the same two points if there were no acoustic lens.
  • FIG. 1 An example of an acoustic lens is shown in figures 1 to 3 , where L indicates an acoustic lens including four slats S, of which only one is indicated in figures 2 and 3 .
  • a carving M with two edges B with a parabolic progress is present on each slat S.
  • the acoustic lens L is set in front of an acoustic driver C, so that the four slats S are inclined at an angle A with respect to the acoustic axis E.
  • the acoustic lens L acts as a plano-concave sound refractor, obtaining divergent behaviour, or rather behaviour similar to the divergent optical lenses.
  • the effect of inclination on the slats S is in fact that of imposing a path with a length greater than the acoustic waves to thus obtain a delay in their propagation.
  • An acoustic wave that travels the space between the slats S where carvings M are not housed travels the first path, while the same acoustic wave that travels the space between the slats S and comes out from the same at the meeting point of the parabolic edges B, therefore in correspondence to the deepest point of the carvings M, travels a second path, such that this second path appears to be shorter than the first path considered previously.
  • acoustic lens L thus allows us to obtain increased and targeted diffusion of acoustic waves generated by acoustic driver C in the environment.
  • the acoustic lenses according to the prior art allow us to obtain propagation of acoustic waves in a single direction, corresponding to the one defined by the acoustic axis, causing only a convergence or divergence of the acoustic waves themselves on a single plane.
  • acoustic lens L allows us to obtain an acoustic refraction effect only on the plane that is perpendicular to the previously described plane P, while the acoustic refraction effect does not take place on the remaining planes. In fact, the refraction effect of acoustic lens L does not take place along plane P.
  • Further artifices for example horn speakers, are necessary if you wish to obtain a targeted diffusion also on different planes with respect to the plane perpendicular to plane P. These artifices however also cause further reduction of the acoustic power emitted.
  • the purpose of this invention is to obtain greater flexibility in the implementation of acoustic lenses.
  • Another purpose of this invention is to allow for a reduction in the directionality of acoustic waves generated by a localised source.
  • Another purpose of this invention is to reduce the directionality, maintaining the original acoustic power generated by the source as much as possible.
  • the three or more elements delimit, between each pair of elements, one or more first spaces of refraction and one or more second spaces of refraction, all developing in one or more directions inclined with respect to the acoustic axis and being adapted to be crossed by the acoustic waves generated by the acoustic source.
  • the one or more spaces of refraction form a first path of refraction having a first length and including an entry portion defined by the entry end of the first pair of three or more elements, and a first exit portion defined by the exit end of a first pair of three or more elements.
  • the one or more second spaces of refraction form a second path of refraction having a second length and including a second entry portion defined by the entry end of the second pair of three or more elements, and a second exit portion defined by the exit end of a second pair of three or more elements.
  • the second length exceeds the first length to thus obtain a refraction of the acoustic waves at the first exit portion and the second exit portion.
  • the acoustic lens includes an acoustic collector which collects and convoys the acoustic waves to the first entry portion and to the second entry portion.
  • This acoustic collector comprises a volume in which the acoustic waves develop.
  • the acoustic lens is characterised by the fact that the acoustic collector is delimited only by the entry end of the three or more elements.
  • the elements that make up the refraction also act as an acoustic collector for their portion. Further components that perform the function of acoustic collector are not therefore necessary.
  • the exit ends of the three or more elements that define the exit portions of the spaces of refraction can have a parabolic progress.
  • the acoustic collector and of the volume of development of the acoustic waves we are able to firstly obtain the development of the acoustic waves to later refract them, thanks to the passage of the same acoustic waves in the spaces of refraction obtained between the elements included in the acoustic lens.
  • the parabolic progress of the ends of the three or more elements that define the exit portions allows us to obtain a refraction effect of the acoustic waves similar to that obtained thanks to the optical lenses.
  • the sound waves emitted by each space of refraction do not dirty each other, or rather they do not interfere with one another, worsening the quality of the sound output.
  • one or more through-holes can be obtained in one or more of the three or more elements and the collector can include these one or more holes. In other words, they are the same one or more through-holes that act as an acoustic collector, without the need for further components that define the acoustic collector.
  • One of the three or more elements can act as the border of the acoustic collector to thus obtain a blind hole in the acoustic lens.
  • the acoustic collector can thus be closed by at least one of the three or more elements.
  • the progress of the ends of the three or more elements can be reversed to a point of the acoustic axis, to thus obtain a divergent effect or a convergent effect, thus being able to obtain a still more marked analogy with optical lenses due to the refraction effect obtained on the acoustic waves.
  • the acoustic collector can be delimited by a guide, thus reducing the reflection of the acoustic waves by the element that acts as a border of the acoustic collector.
  • the guide can have a parabolic profile to thus further improve the progress of the acoustic waves inside the acoustic lens.
  • one or more of the three or more elements can be different from the others in shape and/or size.
  • the end edge of one or more of the three or more elements can include two or more points which are symmetric to each other with respect to the acoustic axis.
  • one or more of the three or more elements can be at least partially disc-shaped.
  • two or more of the three or more elements can be arranged parallel to each other.
  • a divisor can prevent propagation of the acoustic waves in the direction in which it is positioned, limiting diffusion of the acoustic waves into the surrounding environment, limited to a predetermined angle of diffusion.
  • a separation element can separate the acoustic collector in a first portion and in a second portion. Thanks to this structure, we can obtain multiple portions of the acoustic collector to process acoustic emissions from various acoustic sources.
  • an acoustic diffuser including one or more acoustic sources and one or more acoustic lenses according to the previously defined invention.
  • one or more acoustic sources can be positioned with respect to one or more acoustic lenses in a predetermined position based on the structure of one or more acoustic lenses, to thus obtain the desired sound effect.
  • the sound effect varies depending on the structure of one or more of the acoustic lenses utilised and on the relative position of one or more acoustic sources with respect to one or more acoustic lenses.
  • an acoustic diffuser can include two or more acoustic sources and one or more acoustic lenses according to the invention, with each of the two or more acoustic sources being controlled by a special audio signal.
  • the two or more acoustic sources can each be controlled by a stereophonic audio signal to thus obtain stereophonic diffusion in the surrounding environment, for example obtaining a spherical type acoustic field.
  • an acoustic diffuser can include a collector made of rigid material, paired with an acoustic lens according to the invention to thus obtain greater compactness of the acoustic lens, reducing its dimensions.
  • a collector made of rigid material paired with an acoustic lens according to the invention to thus obtain greater compactness of the acoustic lens, reducing its dimensions.
  • simple vibrations can be transformed into sound waves.
  • a vibration induction transducer can be set in contact with a collector made of rigid material to thus obtain greater compactness of the acoustic source and further decrease the dimensions of the entire acoustic diffuser.
  • an acoustic lens according to the invention including a cover disc 12, a beating disc 14 and a series of intermediate discs, described in detail below.
  • Three rods 16 perpendicularly cross the series of intermediate discs from the beating disc 14 to the cover disc 12, allowing each to stay configured with respect to the other, at a distance defined as the inter-disc distance which is constant for all discs on the acoustic lens 10.
  • a single rod or two rods can be used and the distances between the discs can be different and therefore not constant, depending on the desired behaviour of the acoustic lens.
  • the series of intermediate discs includes a first series 30 of discs, a middle disc 32 and a second series 44 of discs.
  • the first series 30 includes five discs, each indicated respectively with 18, 20, 22, 24 and 26 in figure 5 , starting from disc 18, then to beating disc 14 until reaching disc 26, next to middle disc 32.
  • the second series 44 includes five discs, each indicated respectively with 34, 36, 38, 40 and 42 in figure 5 , starting from disc 34, then to middle disc 32 until reaching disc 42, next to middle disc 12.
  • the cover disc 12 has a maximum outer diameter, the same for beating disc 14, while the middle disc 32 has a minimum outer diameter, less with respect to the maximum external diameter.
  • the outer diameters of the first series 30 of discs have dimensions that go between the maximum outer diameter and the minimum outer diameter, decreasing with parabolic progress starting from the outer diameter of disc 42 up to the outer diameter of disc 34. The latter is however higher in minimum outer diameter than middle disc 32.
  • outer diameters of the second series 44 of discs have dimensions that go between the maximum outer diameter and the minimum outer diameter, decreasing with parabolic progress starting from the outer diameter of disc 18 up to the outer diameter of disc 26. The latter is however higher in minimum outer diameter than middle disc 32.
  • cover disc 12 which is a full disc
  • the remaining discs on the acoustic lens 10 have a circular centre hole.
  • Each circular centre hole is concentric to the outer circumference of each disc and therefore defines an inner circumference, to which reference will be made below by means of the corresponding inner diameter.
  • the progress of the inner diameters of the discs on the acoustic lens 10 is different from the progress of the outer diameters of the same described previously.
  • the volume included in the set of holes created in the discs on the acoustic lens 10 defines a collector 50, limited to its end from the cover disc 12.
  • the holes created in the discs on the first series 30 have the same inner diameter, common also to the beating disc 14 and to the middle disc 32, to which reference will be made below as a minimum inner diameter.
  • the holes created in the discs on the second series 44 instead have a gradually increasing inner diameter, starting from disc 34 up to disc 42, which has a maximum inner diameter.
  • the acoustic lens 10 can be paired to an acoustic driver 70, conveniently but not limited to being installed on a bass reflex case 72, including a chord channel 74 made according to prior art.
  • the presence of the case 72 helps diffusion of the low frequencies produced by the acoustic driver 70, while the acoustic lens 10 in this exemplifying configuration best diffuses medium and high frequencies produced by the same acoustic driver 70.
  • the acoustic lens 10 is conveniently positioned with the beating disc 14 in contact with the case 72 and with the circular centre hole positioned near the acoustic driver 70.
  • the acoustic lens 10 the direct acoustic emission of the acoustic driver 70 is collected inside the collector 50. From inside the collector 50, the acoustic waves then propagate in the inter-disc spaces to exit to the outside and continue propagation in the surrounding environment. For example, a generic acoustic wave generated by an acoustic driver 70 and direct according to the acoustic axis of said acoustic driver 70, is channelled into the collector 50 is subsequently diverted to a substantially right angle to then follow into the inter-disc spaces and exit from the acoustic lens 10.
  • the effect of refraction obtained is that of waves that diverge from the acoustic lens 10 when they exit from the inter-disc spaces along the entire circumference of the discs.
  • the acoustic lens 10 thanks to the parabolic progress of the outer diameters, can be indicated as divergent lens.
  • An equivalent focus which allows us to place the concavity of the parabolic progress of the outer diameters in correlation to the distance of the focus of the symmetry axis of the acoustic lens 10, can also be defined.
  • the functioning of the acoustic lens 10 according to the invention can be understood by an analogy with the concave optical lenses and with the menisci.
  • inter-disc distance and, as a result, the inter-disc space between discs are preferably optimised depending on the efficiency that you desire to obtain from the acoustic lens 10 and to the loss of decibel detected.
  • a reduced inter-disc distance allows us to obtain a more defined and appreciable refraction effect, but at the same time entails a higher loss of decibels.
  • a higher inter-disc distance allows for a less defined refraction effect, but at the same time entails less loss of decibels.
  • the growing progress of the internal diameters, starting from disc 34 up to disc 42, allows us to compensate for the difference in length of the inter-disc path between discs that have different distances from the acoustic driver 70, as the optimal condition for obtaining a divergent effect would be that of having an inter-disc path length that is equal depending on the desired angle of divergence.
  • the previously described compensation allows us to obtain similar paths between the delimited path between the beating disc 14 and disc 18 and the delimited path between disc 42 and cover disc 12.
  • an acoustic lens 10' can also include a guide 60 with a cuspid and circular symmetrical shape with respect to the symmetrical axis of the acoustic lens 10' itself.
  • the walls 62 of the guide 60 should preferably have a parabolic progress.
  • the guide 60 should preferably be made with hard material to reflect the acoustic waves.
  • the acoustic lens 10' has a behaviour that is different than the acoustic lens 10, as the reflection of the acoustic waves by the portion of the cover disc 12 facing onto the collector 50 can be greatly reduced.
  • an acoustic lens 110 can include a cover disc 112, a middle disc 132, a beating disc 114 and a series of intermediate discs.
  • the discs on the acoustic lens 110 should preferably be spaced by a pre-set inter-disc distance, for example similar to the previously described inter-disc distance of the discs on the acoustic lens 10, or else it can be different.
  • the acoustic lens 110 includes three rods 116 which allow us to keep the discs at the desired inter-disc distance.
  • the outer diameter of the cover disc 112 and the beating disc 114 should preferably be similar, or for example equal, with the result thus being a minimum outer diameter or at least outer diameters with lower dimensions with respect to the remaining discs on the acoustic lens 110.
  • the outer diameter of the middle disc 132 instead has a maximum outer diameter that is higher with respect to that of the remaining discs on the acoustic lens 110.
  • the outer diameters of the intermediate discs 110 have dimensions included between the maximum outer diameter of the middle disc 132 and the minimum outer diameter of the cover disc 112 or of the beating disc 114, increasing with the parabolic progress starting from the minimum outer diameter of the cover disc 112 up to reaching an outer diameter that is however lower than the maximum outer diameter of the middle disc 132.
  • the parabolic progress of the outer diameter should preferably by symmetrical with respect to the middle disc 132.
  • the discs on the acoustic lens 110 have a circular centre hole, defined by means of its own inner diameter, with the exception of the cover disc 112.
  • the inner diameters of the discs on the acoustic lens 110 are equal to one another.
  • the volume included in the set of holes created in the discs on the acoustic lens 110 defines a collector 150, limited to its end from the cover disc 112.
  • the acoustic lens 110 can be conveniently paired to an acoustic driver 170, conveniently but not limited to being installed on a case 172.
  • the acoustic lens 110 is conveniently positioned with the beating disc 114 in contact with the case 172 and with the circular centre hole positioned near the acoustic driver 170.
  • the acoustic lens 110 the direct acoustic emission of the acoustic driver 170 is collected inside the collector 150. From inside the collector 150, the acoustic waves then propagate in the inter-disc spaces to exit to the outside and continue propagation in the surrounding environment.
  • the particular refraction effect obtained by means of the acoustic lens 110 is that of acoustic waves that converge from the acoustic lens 110 when they exit from the inter-disc spaces along the entire circumference of the discs.
  • the acoustic waves can converge toward a concentric circumference to the discs on the acoustic lens 110, with said circumference having a diameter that depends on the previously described parabolic progress seen in figure 10 .
  • the particular structure of the inner and outer diameters of the discs on the acoustic lens 110 thus allow us to obtain a similar effect to that of the convergent lens.
  • a focus equivalent to that of optical lenses, which allows us to place the convexity of the parabolic progress of the outer diameters in correlation with the distance of focus from the symmetry axis of the acoustic lens 110, or with the diameter of the circumference at which the acoustic waves processed by the acoustic lens 110 can converge, can also be defined.
  • an acoustic lens 210 can include a cover disc 212, a middle disc 232, a beating disc 214 and a series of intermediate discs.
  • the discs on the acoustic lens 210 are portions of the discs made similarly to the discs on the acoustic lens 10.
  • the discs on the acoustic lens 210 are sectioned along a plane that is parallel to the symmetry axis of the discs, identified in figure 11 by a divisor 280.
  • the discs on the acoustic lens 210 should also preferably be spaced by a pre-set inter-disc distance, for example similar to the previously described inter-disc distance of the discs on the acoustic lens 10, or else it can be different.
  • the acoustic lens 210 includes rods, not seen in the figure, which allow us to keep the discs at the desired inter-disc distance.
  • the acoustic lens 210 can be paired with an acoustic driver 270, being able to process the sound waves produced, thus collected in a collector 250.
  • the particular refraction effect obtained by means of the acoustic lens 210 is that of acoustic waves that diverge from the acoustic lens 210 when they exit from the inter-disc spaces along the entire portion of the circumference of the discs.
  • the presence of the divisor 280 prevents propagation of the acoustic waves in the direction in which it is positioned, thus allowing, when desired, diffusion of the acoustic waves into the surrounding environment, limited to a predetermined angle of diffusion.
  • acoustic lens 10 holds true for acoustic lens 210, in particular with respect to the parabolic progress of the outer disc diameters and the divergent behaviour due to the diffusion of the acoustic waves generated by the acoustic driver 270.
  • an acoustic lens 310 includes the previously described acoustic lens 210, this paired to an acoustic lens 311 made in a mirror with respect to the divisor 280.
  • the acoustic lens 311 can therefore be paired with an acoustic driver 371 which generates, for example, acoustic waves independently from the acoustic driver 270.
  • An example of use is the diffusion into the environment of a stereo audio signal, allocating for example the right audio channel to the acoustic driver 270 and the left audio channel to the acoustic driver 370.
  • an acoustic lens 410 includes a cover disc 412, a first beating disc 414, a second beating disc 415 and a series of intermediate discs.
  • the first beating disc 414 is preferably paired with an acoustic driver 470 and a case 472, while the second beating disc 415 is preferably paired with an acoustic driver 471 and a case 473.
  • the outer diameter of the discs is configured according to the parabolic progress.
  • the outer diameter reduces starting from both beating discs 414 and 415 up to the discs near the cover disc 412, which is conveniently constructed with an outer diameter higher than that of the other discs on the acoustic lens 410.
  • the particular structure and configuration of the acoustic lens 410 paired with the previously described acoustic drivers and the cases, allows us to obtain a diffusion of the acoustic waves into the surrounding environment with geometric characteristics seen in figures 17 and 18 .
  • the resulting acoustic diffusion conforms as two acoustic toroids which, in the event that a stereo audio signal is used to govern the acoustic driver 470 and the acoustic driver 471, ensures stereophonic perception over the entire environment surrounding the acoustic lens 410.
  • a divergent acoustic lens allows us to obtain acoustic divergence in more than one direction, depending on the desired result.
  • the acoustic divergence according to the structure of the acoustic lens itself as previously described, can be extended to reach a divergence of the acoustic waves in all direction, thus obtaining the effect of an acoustic field with the same stereophonic qualities and acoustic power in all parts pertaining to a sphere whose centre is in the acoustic lens.
  • the possibility of obtaining a spherical type acoustic field by using an acoustic lens according to the invention also allows us to overcome obstacles that are interposed between the acoustic lens and the receiver of the emitted acoustic waves, thanks to the toroidal diffusion of the acoustic waves which therefore allows for moving around obstacles, also conserving acoustic power and the extension of transmitted frequencies.
  • an acoustic lens 510 includes a cover disc 512, a beating disc 514, a middle disc 532 and a series of intermediate discs.
  • the configuration of the discs and, in particular, the parabolic progress of the outer diameters is similar to that described previously for the acoustic lens 10.
  • the discs on the acoustic lens 510 are integral with a rigid collector 550, preferably made with a high mechanical stiffness material, like for example with hard steel, glass, stone or other.
  • a vibration induction transducer 570 is set in contact with the rigid collector 550 to thus transmit a vibration to the rigid collector 550 which in turn transmits to the discs on the acoustic lens 510.
  • the discs on the acoustic lens 510 being integral with rigid collector 550, also become a source of acoustic emission, in some cases allowing us to obtain an acoustic yield in the surrounding environment that is even better with respect to the variants including traditional acoustic drivers.
  • Another advantage of this solution is the increased compactness due to the small size of the vibration induction transducers 570 with respect to the size of other acoustic drivers.
  • the material with which the acoustic lens is constructed according to the invention is preferably, but not limited to, with high stiffness.
  • material should have at least the stiffness required for maintaining its characteristics essentially unchanged, such as its size, shape and position when forces are applied from the acoustic waves that have to be refracted.
  • the presence of the collector is preferable to obtain optimal functioning of the acoustic lenses according to the invention, due to the fact that most of the shape of the wave of the acoustic emission is able to essentially develop in the collector itself, which therefore as subsequently deviated inside the inter-disc spaces in order to be directed, thus avoiding the formation of undesired harmonics and maintaining a sound that is free as much as possible of noise.
  • Variants to be included in the scope of the invention, defined by the following claims like for example discs with different shapes with respect to circles, such as polygons with three or more sides, systems for maintaining an inter-disc distance different from the rods and different combinations of characteristics with respect to those presented in the respective variants of the invention as described, can also be provided.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP14173122.4A 2013-06-19 2014-06-19 Akustische Linse und Lautsprechvorrichtung mit einer derartigen Linse Withdrawn EP2838083A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000147A ITVR20130147A1 (it) 2013-06-19 2013-06-19 Lente acustica

Publications (2)

Publication Number Publication Date
EP2838083A2 true EP2838083A2 (de) 2015-02-18
EP2838083A3 EP2838083A3 (de) 2015-02-25

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EP14173122.4A Withdrawn EP2838083A3 (de) 2013-06-19 2014-06-19 Akustische Linse und Lautsprechvorrichtung mit einer derartigen Linse

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EP (1) EP2838083A3 (de)
IT (1) ITVR20130147A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017147190A1 (en) * 2016-02-24 2017-08-31 Dolby Laboratories Licensing Corporation Planar loudspeaker manifold for improved sound dispersion
CN114566139A (zh) * 2022-02-28 2022-05-31 华中科技大学 一种基于3d打印仿生海豚的声发射装置及其应用

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735336A (en) * 1971-03-10 1973-05-22 Ampex Acoustic lens
JPS54181921U (de) * 1978-06-13 1979-12-22
JPS6085043A (ja) * 1983-10-18 1985-05-14 Bridgestone Corp 自動車等のエンジン騒音制御装置
EP0717916B1 (de) * 1994-06-08 2002-10-30 Nortel Networks Limited Persönliches freisprechfunkgerät
JP2665174B2 (ja) * 1995-01-13 1997-10-22 日本電気移動通信株式会社 スピーカ装置
US5900593A (en) * 1995-07-31 1999-05-04 Adamson; Alan Brock Loudspeaker system
JPH1013983A (ja) * 1996-06-26 1998-01-16 Matsushita Electric Ind Co Ltd 音響レンズ装置
US7278513B2 (en) * 2002-04-05 2007-10-09 Harman International Industries, Incorporated Internal lens system for loudspeaker waveguides
KR100548076B1 (ko) * 2002-04-25 2006-02-02 학교법인 포항공과대학교 기체 음향렌즈 부착형 음향집중 스피커

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017147190A1 (en) * 2016-02-24 2017-08-31 Dolby Laboratories Licensing Corporation Planar loudspeaker manifold for improved sound dispersion
US10602263B2 (en) 2016-02-24 2020-03-24 Dolby Laboratories Licensing Corporation Planar loudspeaker manifold for improved sound dispersion
CN114566139A (zh) * 2022-02-28 2022-05-31 华中科技大学 一种基于3d打印仿生海豚的声发射装置及其应用

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ITVR20130147A1 (it) 2014-12-20
EP2838083A3 (de) 2015-02-25

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