EP3824652A1 - Dispositif de diffusion sonore a courbure non constante figee - Google Patents
Dispositif de diffusion sonore a courbure non constante figeeInfo
- Publication number
- EP3824652A1 EP3824652A1 EP19753182.5A EP19753182A EP3824652A1 EP 3824652 A1 EP3824652 A1 EP 3824652A1 EP 19753182 A EP19753182 A EP 19753182A EP 3824652 A1 EP3824652 A1 EP 3824652A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- high frequency
- sound diffusion
- diffusion device
- sources
- 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.)
- Pending
Links
- 238000009792 diffusion process Methods 0.000 claims description 111
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000003071 parasitic effect Effects 0.000 abstract description 11
- 238000009434 installation Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 description 16
- 238000009826 distribution Methods 0.000 description 10
- 238000000265 homogenisation Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
- 230000035755 proliferation 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
- H04R1/32—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
-
- 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
- H04R1/30—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
- 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
- H04R27/00—Public address systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
- H04R3/14—Cross-over networks
Definitions
- the present invention relates to a sound diffusion device for a performance stage such as the stage of a concert hall or an open-air festival.
- a waveguide is a physical device used to obtain a possibly flat isophase wavefront. As such, it plays the same role as a roof that would be loaded on a compression engine, with the major difference that it requires a reduced physical size. Indeed, obtaining a flat isophase wavefront at the output would require a pavilion of infinite length, contrary to the compactness objectives of a sound diffusion device.
- these speakers are generally designed in a modular fashion as relatively small elements, the overall height is that of the largest speaker.
- Each enclosure can then be tilted with respect to its neighbor in a variable manner in order to ensure the objectives of coverage, intensity and homogeneity.
- This angular flexibility makes it possible to focus the energy in one direction (generally the distant audience) by stacking a lot of speakers with little or no inter-element angle or, on the contrary, covering a large angular sector with little energy by assembling the speakers with large inter-element angles.
- variable angle fixing devices between the speakers, which implies a longer installation time, an additional cost and an overweight
- the invention relates to a sound diffusion device comprising a single box and, in this single box, at least two superimposed high frequency acoustic sources, and several medium frequency acoustic sources and / or low frequency superimposed and arranged to the left and / or right of the high frequency acoustic sources, the acoustic sources high frequency being individually coupled to a waveguide so as to generate a vertical wavefront with fixed non-constant curvature.
- the at least two superimposed high frequency acoustic sources form a curved vertical stack.
- this curved vertical stack has a fixed non-constant physical curvature.
- Each high frequency acoustic source has a main direction of emission.
- the physical curvature of a curved vertical stack is clearly equal to the curvature of the arc representing the profile curve of this curved vertical stack.
- Another definition of the physical curvature of the curved vertical stack of high frequency acoustic sources can also be the succession of angles formed by the main directions of emission of two consecutive acoustic sources.
- a physical curvature of the curved vertical stack of non-constant high frequency acoustic sources is a curvature for which at least one angle alphaj, formed by the main directions emission of two consecutive high frequency acoustic sources, i being an integer between 1 and N-1, is different from the other angles alpha_n, for n different from i.
- a physical curvature of the curved vertical stack of frozen high frequency acoustic sources is, more precisely, a curvature that is not capable of being modified by a user.
- each waveguide includes an outlet, the outlets of the waveguides being arranged in a perfectly contiguous manner, so as to form a continuous ribbon;
- the curvature of the vertical wavefront is not constant and fixed, and its evolution is monotonous; • the high frequency sources are individually electronically controlled in amplitude and in phase so as to adapt the resulting wavefront to the broadcasting objectives for an audience;
- the sound diffusion device also comprising:
- o orientable flaps acting on a sound emission from at least one of the high frequency acoustic sources to produce a directivity of sound emission from the high frequency acoustic source according to a chosen angular sector, the high frequency acoustic source and the acoustic source emitting on a medium frequency range being configured to transmit over a common frequency range;
- At least one control module of the digital signal processor type acting on a signal intended for the high frequency acoustic source and on a signal intended for the acoustic source emitting over a medium frequency range so as to apply in the frequency range common at least one magnitude parameter on the high frequency acoustic source and / or on the acoustic source emitting over a medium frequency range as well as at least one phase parameter on the high frequency acoustic source and / or on the acoustic source emitting on a medium frequency range so as to produce a sound emission directivity of the couple consisting of the high frequency acoustic source and the acoustic source emitting over a medium frequency range according to the same angular sector chosen as the directivity produced by the orientable flaps.
- Another characteristic that can be used alone or in combination with the previous ones is that the curvature of the curved vertical stack has a monotonous evolution.
- the sound diffusion device comprises at least three high frequency acoustic sources.
- Another characteristic which can be used alone or in combination with the preceding ones is that electronic control and amplification channels are capable of supplying each or more of the high frequency sources, as well as each or more acoustic sources among the plurality of acoustic sources. medium frequency and / or low frequency.
- the invention relates in particular to a sound broadcasting device with a wide range, in which all of the high frequency acoustic sources produce a directivity of overall sound emission having an angle d total vertical opening less than or equal to 20 °.
- the invention also relates to a sound diffusion device with extended vertical opening, in which the set of high frequency acoustic sources produces a directivity of overall sound emission having an angle d total vertical opening greater than 20 °.
- the invention also relates to a sound diffusion assembly which may include at least a first sound diffusion device with extended range and a sound diffusion device as defined above, superimposed on such so that the resulting sound diffusion assembly generates a vertical wave front with fixed non-constant curvature.
- the sound diffusion device with extended range is couplable and is assembled with another sound diffusion device as previously defined.
- the extended range sound broadcasting device can be coupled to a wide range sound broadcasting device identical to itself.
- the term "identical” should be understood to mean a device being a strict copy of the 300_F "extended range” sound diffusion device, having exactly the same technical, geometric and physical characteristics.
- the extended range sound diffusion device can be homo-couplable.
- the diffusion assembly comprising at least a first extended range sound diffusion device and a sound diffusion device as defined above, superimposed, forms a curved vertical stack having a fixed, non-constant physical curvature.
- the high frequency sources are individually electronically controlled in amplitude and in phase so as to adapt the resulting wavefront to the broadcasting objectives for an audience and to compensate for any non-monotony generated by an assembly of the devices between them;
- the sound diffusion assembly further comprises fixing means configured so that each sound diffusion device is connected to the sound diffusion device located above, respectively below, by fixing points without angular adjustment .
- Another characteristic of this assembly which can be used alone or in combination with the preceding ones, is that the high frequency sources of the various sound diffusion devices of the sound diffusion assembly are individually electronically controlled in amplitude and in phase so as to adapt a resulting wavefront to the objectives of diffusion on an audience and to compensate for a possible non-monotony of the physical curvature of the curved vertical stack formed by the diffusion assembly, generated by an assembly of the devices between them.
- Another characteristic which can be used alone or in combination with the previous ones is that the individual electronic amplitude and phase control of high frequency sources, combined with electronic amplitude and phase control of several medium frequency and / or low frequency acoustic sources may be dependent on the frequency considered.
- each of a plurality of electronic control and amplification channels can supply one or more of one or more of the high frequency sources of the different sound diffusion devices of the 'sound diffusion assembly as well as one or more among the plurality of medium frequency and / or low frequency acoustic sources of the various sound diffusion devices of the sound diffusion assembly.
- Figures 1a and 1b show a scene equipped with sound diffusion devices arranged in a conventional stereo arrangement ( Figure 1a) or an arrangement adapted to broadcast a spatialized sound signal (Figure 1b);
- FIG. 2 represents a scene, the physical distribution of an audience seen in profile, as well as the positioning of four characteristic points of the audience: the mixing cabin (“FOH”), the plumb (“Below”) , the back (“Behind”) and the ceiling (“Above”) of the sound system;
- FOH mixing cabin
- Below plumb
- Behind back
- Above ceiling
- FIG. 3a and 3b respectively represent the sound pressure field around a sound diffusion device composed of a vertical stack bent of speakers generating a non-continuous wavefront and the sound level generated by such a diffusion device sound to the four characteristic points of FIG. 2, referenced in relation to the sound level in the mixing cabin;
- FIG. 4 shows a sound diffusion device according to a first embodiment of the invention
- FIG. 5a and 5b respectively represent the sound pressure field around a sound diffusion device according to the embodiment of Figure 4 and the sound level generated by such a sound diffusion device at the four characteristic points of Figure 2 referenced in relation to the sound level at the mixing booth;
- FIG. 7a to 7e show the results of a digital simulation performed for a vertical straight stack of speakers; in particular :
- FIG. 7a shows the physical deployment of this stack in the vertical plane and the positioning of two characteristic points of the audience: the mixing booth (“FOH”) and the start of the audience ("Proximity");
- FIG. 7c represents the frequency response curves in phase of this deployment at the two characteristic points of FIG. 7a, without application of the electronic control, and after subtraction of the minimum propagation delay;
- FIG. 7d represents the set of frequency response curves in magnitude of this deployment on the audience, on the stage and on the ceiling, after application of electronic control for the purpose of homogenization.
- FIG. 7e represents the frequency response curves in phase of this deployment at the two characteristic points of FIG. 7a, after application of the electronic control for the purpose of homogenization, and after subtraction of the minimum propagation delay;
- FIG. 8a to 8e represent the results of a digital simulation performed for a curved vertical stack of speakers; in particular :
- FIG. 8a shows the physical deployment of this stack in the vertical plane and the positioning of two characteristic points of the audience: the mixing booth (“FOH”) and the start of the audience ("Proximity");
- Figure 8c shows the frequency response curves in phase of this deployment at the two characteristic points of Figure 8a, without application of electronic control, and after subtracting the minimum propagation delay;
- FIG. 8d represents the set of frequency response curves in magnitude of this deployment on the audience, on the stage and on the ceiling, after application of the electronic control for homogenization purposes;
- FIG. 8e shows the frequency response curves in phase of this deployment at the two characteristic points of Figure 8a, after application of electronic control for the purpose of homogenization, and after subtraction of the minimum propagation delay;
- Figures 9a to 9c show the results of a digital simulation performed for a sound diffusion device according to a second embodiment of the invention.
- FIG. 9a shows the physical deployment of this device in the vertical plane and the positioning of two characteristic points of the audience: the mixing booth (“FOH”) and the start of the audience ("Proximity");
- FIG. 9c represents the frequency response curves in phase of this device at the two characteristic points of FIG. 9a, without application of the electronic control, and after subtraction of the minimum propagation delay
- FIG. 9d represents the set of frequency response curves in magnitude of this device on the audience, on the stage and on the ceiling, after application of the electronic control for the purpose of homogenization
- o FIG. 9e represents the frequency response curves in phase of this device at the two characteristic points of FIG. 9a, after application of the electronic control for the purpose of homogenization, and after subtraction of the minimum propagation delay
- FIG. 10 shows a sound diffusion device "at extended range"
- FIG. 11 shows a sound diffusion device "extended vertical opening"
- - Figure 12 shows a set of sound diffusion according to a first embodiment
- - Figure 13 shows a set of sound diffusion according to a second embodiment.
- a "sound diffusion device” consists of one or more acoustic sources whose ranges or frequency bands can be identical or different.
- a high frequency band, HF covers the highest frequencies corresponding to so-called high sounds, typically an interval 1 kHz - 20kHz.
- a medium frequency band, MF covers the intermediate frequencies, typically an interval 200Hz - 1 kHz.
- a low frequency band, LF covers the low frequencies corresponding to so-called bass sounds, typically an interval 60Hz - 200Hz.
- a very low frequency band corresponding to so-called sub-bass or sub-bass sounds, TBF optional covers the lowest frequencies, typically frequencies below 60Hz.
- the same component can be used to reproduce the signals of the LF and MF bands.
- an acoustic source can emit over several frequency ranges but will be defined subsequently by its main emission range.
- the term "audience” designates the physical distribution of the listeners or spectators present during a performance in relation to a scene. As illustrated in Figures 1a-1b and 2, this physical distribution can take different configurations.
- audience 2 can be relatively close to stage 1 while at an outdoor festival, audience 2 can be larger.
- Audience 2 can also be divided in height, depending on whether the spectators are at ground level ZO or are raised by bleachers or any other similar structure ZH.
- one of the objectives is that all of the frequency components of the sound signal emitted by the sound diffusion device arrive at the same instant and in phase at any point of the hearing. [45] Ideally, according to this objective, the frequency response curves in phase should all be confused with the horizontal axis of zero phase after subtracting the minimum propagation delay.
- the minimum propagation delay is defined as the time taken for the sound pressure wave to reach a given hearing point, from the nearest enclosure.
- Each sound diffusion device can be defined by three main technical characteristics: its total vertical opening, its total horizontal opening and its range.
- range designates the distance between the sound diffusion device 3, generally located on the front of stage 1, and the depth at which the sound diffused by this device 3 is correctly heard (intelligibly / consistent) in audience 2.
- total opening usually designates twice the angle for which a loss of 6dB is observed, corresponding to a 50% reduction in sound intensity, compared to the axis of the sound device under consideration, namely vertical or horizontal. This axis is defined as the direction where the sound intensity is maximum in the direction considered.
- Figure 1a illustrates a conventional stereo arrangement 10 comprising two sound broadcasting devices 3, both situated high above the stage 1, one situated to the left G and the other to the right D of the stage 1.
- FIG. 1 b illustrates an arrangement 100 suitable for broadcasting a spatialized sound signal and comprising four sound broadcasting devices 3.
- Each sound diffusion device 3 comprises a vertical stack of speakers inclined with respect to each other so as to mechanically tilt the overall vertical directivity of the sound diffusion device 3 towards the audience 2.
- the profile view of scene 1 and of such a sound diffusion device 3, Figure 2 allows to see in dotted line the axis normal to each enclosure and its inclination as a function of the area of target audience 2.
- the installation of such a device 3 is very complex because it requires determining the optimum angle of inclination between each enclosure in order to target, depending on the audience 2, key or median points allowing a homogeneous distribution of the sound broadcast over the audience 2.
- such a stack of speakers generates a non-continuous wavefront.
- Figure 3a represents the sound pressure field around such a device 3 at the particular frequency of 1324 Hz, corresponding to the appearance of a peak in sound intensity at the rear of the device 3.
- a level of dark gray represents a significant sound pressure, and therefore a significant sound level.
- a light gray level represents a reduced sound level.
- Figure 3b represents the sound level generated at four characteristic points of the audience: the mixing cabin (“FOH”), the plumb (“Below”), the back (“Behind”) and the top (“Above”) of such a sound diffusion device 3, referenced in relation to the sound level in the mixing cabin.
- the device 3 is here composed of an assembly of 12 enclosures with variable curvature, each enclosure being composed of an HF source and two MF sources, having 13mm thick separation panels and assembly plays of the 'order of 5mm between each enclosure.
- a first embodiment of the invention relates to a sound diffusion device 300 as illustrated in FIG. 4.
- the sound diffusion device 300 comprises a single box 310, and in this single box, at least two superimposed high frequency acoustic sources 320, and several average acoustic sources frequency and / or low frequency 330 superimposed and arranged to the left and / or right of the high frequency acoustic sources 320, the high frequency acoustic sources 320 being individually coupled to a waveguide 340 so as to generate a vertical wavefront with fixed non-constant curvature.
- the at least two superimposed high frequency acoustic sources form a curved vertical stack.
- this curved vertical stack has a fixed non-constant physical curvature.
- Each high frequency acoustic source has a main direction of emission.
- the physical curvature of a curved vertical stack is clearly equal to the curvature of the arc representing the profile curve of this curved vertical stack.
- Another definition of the physical curvature of the curved vertical stack of high frequency acoustic sources may also be the succession of angles formed by the main directions of emission of two consecutive acoustic sources.
- the sound diffusion device 300 comprises at least three high frequency acoustic sources 320.
- a physical curvature of the curved vertical stack of non-constant high frequency acoustic sources is a curvature for which at least one angle alphaj, formed by the main directions of emission of the i-th and i + 1 th consecutive high frequency acoustic sources 320, i being an integer between 1 and N-1, is different from the other angles alpha_n, for n different from i.
- a physical curvature of the curved vertical stack of frozen high frequency acoustic sources 320 is a curvature that is not capable of being modified by a user.
- each waveguide 340 comprises an output, the outputs of the waveguides being contiguous, so as to form a continuous ribbon and therefore a continuous wavefront.
- the non-constant curvature of the vertical wavefront be monotonous.
- Figure 5a shows the sound pressure field around such a device 300 at this same particular frequency of 1324 Hz and with the same color codes as in Figure 3a.
- Figure 5b represents the sound level generated at the same three audience characteristic points, referenced with respect to the sound level at the mixing booth.
- the device 300 is for this digital simulation composed of a stack of 12 high frequency sources, having neither separation panels nor assembly clearances, and therefore generating a continuous wavefront. These graphs show the disappearance or very strong attenuation of the parasitic lobes of unwanted sound levels directly above, behind and above the sound diffusion device 300.
- this kind of sound diffusion device 300 makes it possible, thanks in particular to the combination of several sources in a single enclosure (i.e. a single box 310):
- the curvature of the curved vertical stack of high frequency acoustic sources is fixed and cannot be modified by a user. Thus, no adjustment by the user is necessary for the installation of the different sources.
- the high frequency sources 320 can be individually electronically controlled in amplitude and phase.
- Electronic control allows, among other things, to modify the inclination of the directivity lobe of the assembly without having to physically incline them.
- the main sound lobe can be tilted at an angle qo.
- a physical or electronic setting that does not generate a parasitic lobe whose sound intensity is greater than -12dB relative to the main lobe, and at the same distance from the source, can be considered acceptable.
- Figures 7a to 7e show the results obtained with a vertical rectilinear stack of speakers comprising a high frequency acoustic source located between two medium and / or low frequency acoustic sources on the same horizontal plane.
- the solid lines starting from the vertical rectilinear stack represent the total vertical opening covered.
- Figure 7b represents the frequency response curves in magnitude generated by such a vertical rectilinear stack before the application of electronic control on the acoustic sources.
- the dark gray curves correspond to the audience, and the light gray dotted curves correspond to the stage and the ceiling.
- FIG. 7c represents the frequency response curves in phase generated by such a vertical rectilinear stack, at the mixing booth (“FOH”) and at the start of the hearing (“Proximity”), before the application of the electronic control on acoustic sources, and after subtracting the minimum propagation delay.
- FIG. 7d represents the frequency response curves in magnitude generated by such a vertical rectilinear stack, after the application of electronic control on the acoustic sources, and with the same color codes as in FIG. 7b.
- FIG. 7e represents the frequency response curves in phase generated by such a vertical rectilinear stack, after the application of electronic control on the acoustic sources and subtraction of the minimum propagation delay, calculated at the mixing booth and at the start of the hearing.
- Figures 8a to 8e show the results obtained with a curved vertical stack of speakers including an acoustic source high frequency located between two medium and / or low frequency acoustic sources on the same horizontal plane.
- the solid lines starting from the curved vertical stack represent the total vertical opening covered.
- Figure 8b shows the frequency response curves in magnitude generated by such a curved stack after optimization of the angles between each source and before the application of electronic control on the acoustic sources, and with the same color codes as in Figure 7b.
- FIG. 8c represents the frequency response curves in phase generated by such a curved stack after optimization of the angles between each source, at the mixing booth and at the start of the hearing, before the application of the electronic control on the acoustic sources and after subtracting the minimum propagation delay.
- Figure 8d represents the frequency response curves in magnitude generated by such a curved stack, after optimization of the angles between each source and application of electronic control on the acoustic sources, and with the same color codes as in Figure 7b.
- FIG. 8e represents the frequency response curves in phase generated by such a curved stack after optimization of the angles between each source, application of electronic control on the acoustic sources and subtraction of the minimum propagation delay, calculated at the level of the mixing cabin and at the start of the hearing.
- FIG. 9a represents the results obtained with a sound diffusion device 300 with a non-constant physical curvature fixed as described above.
- the solid lines starting from the sound device 300 represent the total vertical opening covered.
- FIG. 9b represents the frequency response curves in magnitude generated by such a device 300 from only the fixed non-constant physical curvature, and with the same color codes as in FIG. 7b.
- FIG. 9c represents the frequency response curves in phase generated by such a device 300 from only the fixed non-constant physical curvature, after subtracting the minimum propagation delay, calculated at the mixing booth and at the start of the hearing.
- FIG. 9a represents the frequency response curves in magnitude generated by such a device 300 from only the fixed non-constant physical curvature, after subtracting the minimum propagation delay, calculated at the mixing booth and at the start of the hearing.
- FIG. 9d represents the frequency response curves in magnitude generated by such a device 300, after the application of electronic control in magnitude and in phase, with an acoustic source per DSP channel, and with the same color codes as in FIG. 7b.
- FIG. 9e represents the frequency response curves in phase generated by such a device 300, after application of the electronic control in magnitude and in phase, with an acoustic source by DSP channel, and after subtraction of the minimum propagation delay, calculated in the cabin and at the start of the hearing.
- the sound diffusion device 300 can then be equipped with orientable flaps acting on a sound emission from at least one of the high frequency acoustic sources 320 to produce a directivity of sound emission from the high frequency acoustic source according to a chosen angular sector, the a high frequency acoustic source and the acoustic source emitting over a medium frequency range being configured to emit over a common frequency range.
- the sound diffusion device also comprises at least one control module of the digital signal processor type acting on a signal intended for the high frequency acoustic source and on a signal intended for the acoustic source emitting over a medium frequency range. so as to apply in the common frequency range at least one magnitude parameter on the high frequency acoustic source and / or on the acoustic source emitting over a medium frequency range as well as at least one phase parameter on the high frequency acoustic source and / or on the acoustic source emitting over a medium frequency range so as to produce a sound emission directivity of the couple consisting of the high frequency acoustic source and the acoustic source emitting over a medium frequency range according to the same angular sector chosen as the directivity produced by the adjustable shutters.
- the graph on the right of FIG. 10 illustrates another representation of the evolution of the physical curvature of the curved vertical stack of high frequency acoustic sources 310 formed by the “extended range” sound diffusion device 300_F, compared to the sub-figure of the figure
- the graph on the right of Figure 1 1 illustrates another representation of the evolution of the physical curvature of the curved vertical stack of high frequency acoustic sources 310 formed by the “wide vertical opening” sound diffusion device 300_W, with respect to the sub-figure of Figure 1 1 where are represented the values of curvature of the sound diffusion device "with extended vertical opening” 300_W by lines perpendicular to the wave front.
- This graph shows the evolution of the physical curvature of the curved vertical stack of high frequency acoustic sources 310 formed by the sound diffusion device "with extended vertical opening" 300_W, that is to say the evolution of the value of the angle alphaj between the i-th and i + 1-th acoustic source, for i integer ranging from 1 to N-1, N being the number of high-frequency acoustic sources 310.
- N being the number of high-frequency acoustic sources 310.
- a sound diffusion assembly comprises at least one first sound diffusion device "with extended range " 300_F and a sound diffusion device 300, 300_F or 300_W as defined above and superimposed so that the resulting sound diffusion assembly generates a vertical wave front with non-constant curvature fixed as illustrated in Figure 12.
- the 300_F "wide-range” sound diffusion device can be coupled with another 300, 300_F or 300_W sound diffusion device as defined above and can be assembled by fixing means.
- the “wide-range” sound diffusion device 300_F can be coupled with a “wide-range” sound diffusion device 300_F identical to itself.
- a sound diffusion assembly resulting from the superposition of two sound diffusion devices as previously described, forms a curved vertical stack having a fixed non-constant physical curvature.
- the high frequency sources can be individually electronically controlled in amplitude and in phase.
- This may in particular be the non-monotony of the physical curvature of the curved vertical stack formed by the sound diffusion assembly.
- the electronic amplitude and phase control of the high frequency acoustic sources 320 and / or the low and / or medium frequency acoustic sources 330 can thus make it possible to adjust a sound wavefront emitted by the sound diffusion assembly to the objectives of broadcast to an audience.
- the graph on the right of Figure 13 illustrates another representation of the evolution of the physical curvature of the curved vertical stack of high frequency acoustic sources 310 formed by a set of sound diffusion resulting from the assembly of two sound diffusion devices "at extended range" 300_F, compared to the sub-figure of figure 13 where are represented the values of curvature of this set of sound diffusion by lines perpendicular to the wave front.
- this graph we observe a non-monotony of the evolution of the angles between sources 7 and 9, corresponding to a break in monotony of the evolution of the physical curvature of the curved vertical stack formed by the sound diffusion assembly.
- a DSP control makes it possible to readjust the sound wavefront emitted by the sound broadcasting assembly to adapt it to the broadcasting objectives.
- the diffusion assembly can advantageously include fixing means configured so that each sound diffusion device is connected to the sound diffusion device located above, respectively below, by fixing points without angular adjustment.
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1856699A FR3084230B1 (fr) | 2018-07-19 | 2018-07-19 | Dispositif de diffusion sonore a courbure non constante figee |
PCT/FR2019/051817 WO2020016538A1 (fr) | 2018-07-19 | 2019-07-19 | Dispositif de diffusion sonore a courbure non constante figee |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3824652A1 true EP3824652A1 (fr) | 2021-05-26 |
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EP19753182.5A Pending EP3824652A1 (fr) | 2018-07-19 | 2019-07-19 | Dispositif de diffusion sonore a courbure non constante figee |
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US (1) | US11463807B2 (fr) |
EP (1) | EP3824652A1 (fr) |
FR (1) | FR3084230B1 (fr) |
WO (1) | WO2020016538A1 (fr) |
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FR3084230B1 (fr) | 2018-07-19 | 2021-01-01 | L Acoustics | Dispositif de diffusion sonore a courbure non constante figee |
Family Cites Families (8)
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US6343133B1 (en) * | 1999-07-22 | 2002-01-29 | Alan Brock Adamson | Axially propagating mid and high frequency loudspeaker systems |
ITBS20050006A1 (it) * | 2005-01-28 | 2006-07-29 | Outline Di Noselli G & C S N C | Elemento diffusore del suono per formare sistemi di diffusori in linea verticale a direttivita' regolabile sia orizzontalmente sia verticalmente |
US9911406B2 (en) * | 2013-03-15 | 2018-03-06 | Loud Audio, Llc | Method and system for large scale audio system |
ES2642898T3 (es) * | 2013-10-30 | 2017-11-20 | L Acoustics | Sistema de sonorización con directividad ajustable mejorada |
US9860633B2 (en) * | 2016-06-03 | 2018-01-02 | Harman International Industries, Incorporated | Baffle for line array loudspeaker |
CN111587581B (zh) * | 2018-01-09 | 2021-11-12 | Qsc公司 | 用于扬声器组件的多路声波导 |
US10356512B1 (en) * | 2018-01-12 | 2019-07-16 | Harman International Industries, Incorporated | Unified wavefront full-range waveguide for a loudspeaker |
FR3084230B1 (fr) | 2018-07-19 | 2021-01-01 | L Acoustics | Dispositif de diffusion sonore a courbure non constante figee |
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2018
- 2018-07-19 FR FR1856699A patent/FR3084230B1/fr active Active
-
2019
- 2019-07-19 US US17/261,513 patent/US11463807B2/en active Active
- 2019-07-19 WO PCT/FR2019/051817 patent/WO2020016538A1/fr active Application Filing
- 2019-07-19 EP EP19753182.5A patent/EP3824652A1/fr active Pending
Also Published As
Publication number | Publication date |
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US20210297772A1 (en) | 2021-09-23 |
CN112655222A (zh) | 2021-04-13 |
FR3084230A1 (fr) | 2020-01-24 |
FR3084230B1 (fr) | 2021-01-01 |
US11463807B2 (en) | 2022-10-04 |
WO2020016538A1 (fr) | 2020-01-23 |
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