EP3063950A1 - Sound system with improved adjustable directivity - Google Patents

Sound system with improved adjustable directivity

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Publication number
EP3063950A1
EP3063950A1 EP13805441.6A EP13805441A EP3063950A1 EP 3063950 A1 EP3063950 A1 EP 3063950A1 EP 13805441 A EP13805441 A EP 13805441A EP 3063950 A1 EP3063950 A1 EP 3063950A1
Authority
EP
European Patent Office
Prior art keywords
sound
acute
sound transducer
transducer
medium
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.)
Granted
Application number
EP13805441.6A
Other languages
German (de)
French (fr)
Other versions
EP3063950B1 (en
Inventor
Christophe Combet
Christian Heil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
L Acoustics SAS
Original Assignee
L Acoustics SAS
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Filing date
Publication date
Application filed by L Acoustics SAS filed Critical L Acoustics SAS
Publication of EP3063950A1 publication Critical patent/EP3063950A1/en
Application granted granted Critical
Publication of EP3063950B1 publication Critical patent/EP3063950B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • 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
    • 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

Definitions

  • the invention relates to the control of the directivity of electroacoustic sound sources, whether they are used in professional, institutional or domestic sound systems.
  • Electroacoustic sound sources are commonly referred to as “loudspeakers”, “speaker systems”, “source lines” or “loudspeakers or sound systems”.
  • the directivity generally expresses an angle corresponding to the angular sector for which the level of sound pressure or SPL for Sound Pressure Level in English is constant over a frequency range specified by the manufacturer. It will be said that such sound source has, for example, a horizontal directivity of 90 °, controlled from 1 kHz to 10 kHz.
  • the term "controlled” implies that the SPL is constant within +/- 3dB on a sector of 90 ° between 1 kHz and 10 kHz, while the attenuation of the SPL outside this sector angular should be as high as possible, typically greater than 6dB.
  • the directivity of a sound source distinguishes two planes, the horizontal plane and the vertical plane, for which this characteristic generally has different values.
  • the art of controlling the directivity of sound sources goes back to the origin of the speakers.
  • the former is traditionally mechanical: it relies heavily on the use of sound horns, and / or the network arrangement of multiple transducers.
  • the "sound source” products belonging to this class in the professional sector or not, present for a given horizontal or vertical plane, a single directivity, fixed once and for all by the hardware configuration of the components of the acoustic enclosure.
  • the choice of transducers, their frequency of connection, the type of flag or waveguide mounted in front of the orifice of compression chamber motors or electrodynamic loudspeakers thus determines the directivity characteristics of the sound source over a spectral band. more or less extensive.
  • the second way of controlling directivity has emerged over the past decade, relying on the electronic recourse provided by the DSP components for Digital Signal Processor in English - or digital signal processor in French. Often identical transducers are associated according to a predefined physical arrangement. The transducers operate on a common frequency range chosen by the manufacturer. With the aid of the DSP component are applied to at least one of the transducers magnitude and phase parameters in other terms of filtering, gain, phase shift, delay for modifying and controlling the directivity of the set of speakers, considered as a complex sound source.
  • the advantage of this approach lies in its power to propose different directivities for the same physical configuration. It always involves a large number of transducers to obtain a high quality of control.
  • the device presented in EP 1 635 606 belongs to the first class of sound sources with mechanical action, with adjustable flaps acting mechanically and acoustically on the medium and treble transducers.
  • the method uses different DSP parameters for different flap settings, for the sole purpose of linearizing the frequency response.
  • the frequency of connection between mid and high-frequency transducers is fixed, thus independent of the flap orientation.
  • the object of the invention is to overcome the disadvantages of known loudspeaker systems, by proposing a system which has a particularly effective directivity and which is of a sufficiently simple construction.
  • a sound system comprising at least one acute sound transducer and at least one medium sound transducer, orientable flaps acting on a sound emission of the high-pitched sound transducer to produce a sound emission directivity of the acute sound transducer according to a selected angular sector, characterized in that it is configured so that the medium sound transducer and the acute sound transducer emit over a common frequency range and it comprises at least one control module of Digital signal - acting on a signal to the acute sound transducer and on a signal to the mid-range sound transducer so as to apply in the common frequency range at least one magnitude parameter on the acute sound transducer (1) and / or on the medium sound transducer as well as at least one phase parameter on the acute sound transducer and / or ur medium sound transducer so as to produce a sound emission directivity of the pair consisting of the acute sound transducer and the medium sound transducer according to the same angular sector selected as the directivity produced by the adjustable
  • the adjustable flaps and the control module of the DSP type are configured in such a way that they each generate a presence of the sound waves at a substantially constant sound level in said selected angular sector, the adjustable flaps and the control module of the following type.
  • DSPs are configured such that they attenuate the sound waves at any angle outside said selected angular sector at an attenuation greater than 6 dB from the highest sound level in said selected angular sector.
  • the sound system is configured so that the common frequency range is variable depending on the orientation of the adjustable flaps.
  • the sound system comprises at least two medium sound transducers and at least one acute acoustic transducer, the medium sound transducers being arranged on either side of the acute sound transducer.
  • the sound system comprises a housing at least partially surrounding one of the flaps, said at least one of the flaps having a surface oriented vis-à-vis a sound flow emitted by said acute sound transducer and a surface oriented away from the sound flux emitted by said high-frequency sound transducer, the obstacle-forming housing in front of the surface of the flap (6) oriented away from the sound flux emitted by the acute sound transducer so as to protect this surface against impact by a foreign object.
  • said at least one medium sound transducer comprises a movable membrane of substantially conical shape and the housing of said at least one flap is shaped to fit a portion of the substantially conical shape of the membrane.
  • the sound system is a portable sound system.
  • the sound system comprises at least two serious sound transducers and said at least two serious sound transducers are disposed on either side of an assembly constituted by said at least one acute sound transducer and said at least two sound transducers. medium.
  • the sound system comprises at least one waveguide which conveys sound waves emitted by the acute sound transducer.
  • the sound system comprises a slot through which sound waves produced by the acute sound transducer are emitted, said at least two medium sound transducers being disposed on either side of the slot.
  • FIG. 2 shows in section a portion with adjustable flaps of the same system of speakers.
  • the loudspeaker system shown in Figure 1 has a K arrangement of the mid and high transducers.
  • This speaker system seen from the front is symmetrical with respect to the vertical plane passing through the system in the middle.
  • compression chamber motors 1 mounted in line coupled to superimposed waveguides 2 having on the front face an outlet in the form of a vertical longitudinal slot 3.
  • medium transducers 4 located closer to the slot 3.
  • bass drivers 5 located near the mid section.
  • the acute transducers 1 emit high frequencies which are frequencies between about 1 kHz and about 10 kHz.
  • the midrange transducers emit medium frequencies which are frequencies between about 200Hz and about 1kHz.
  • the bass transducers emit bass frequencies that are frequencies below about 200Hz.
  • These walls 6 form here orientable flaps.
  • a mechanical adjustment of these pivotable flaps 6 is thus implemented at the output of the waveguide 2 itself connected to the orifice of the high-frequency transducer 1, here constituted by a compression chamber motor.
  • the assembly is positioned between two or more medium transducers 4 mounted in direct radiation on a fixed plane, so that the complete device has, from the front, a symmetry with respect to a vertical plane.
  • the flaps 6 located at the output of the waveguides 2 are here movable with a preselection of several orientations.
  • the flaps 6 are here imprisoned in two respective housings 7.
  • Each of the housings 7 extends around a space defined by the lower face of the shutter 6 turned away from the high-frequency sound flow.
  • the housings 7 thus protect the flaps 6 so that no external object can come into contact with the flap under it.
  • Each of the housings 7 also houses and protects an orientation rotation and preselection system of the corresponding flap 6.
  • the housings 7 each have a portion overlapping a respective medium transducer. In this covering part, each housing 7 enters the conical space delimited by the movable membrane of the medium transducer 4 considered and matches the shape of the membrane. This covering part thus plays the role of a medium compression chamber.
  • the shutters 6 are here individually adjustable so that one can adopt with the present system an asymmetrical adjustment of the direction of the sound flow, either to the right or to the left depending on whether one or other of the flaps is arranged in the most raised position.
  • the rotation of the flaps 6 makes it possible to modify the directivity of the acute over the operating range of the acute transducers, typically over the frequency range greater than 800 Hz, provided however that the size of the flaps 6, in open or closed mode, sufficient to ensure effective control. Indeed, it is worth noting the loss directional control as the flaps are narrowed in a narrow angular sector because of too small physical dimensions at the exit of the flaps.
  • the mid and high-frequency transducers 1 operate on a common frequency range and a DSP component sets the magnitude and phase parameters of the acute 1 and medium 4 transducers in the common frequency range so that the directivity obtained by such parameters is the same as the directivity produced by the adjustment of flaps 6 in the high frequencies.
  • a DSP component sets the magnitude and phase parameters of the acute 1 and medium 4 transducers in the common frequency range so that the directivity obtained by such parameters is the same as the directivity produced by the adjustment of flaps 6 in the high frequencies.
  • at least the three source points are combined electronically by means of DSP, namely the acute transducer 1 positioned in the center and the two identical medium transducers 4 situated on either side, so that, in a manner known per se, acoustic summation is known. resulting result in the desired directivity.
  • the present processing consists of other terms to adjust the parameters of filtering, gain, phase and delay, a delay equivalent to a frequency-dependent phase shift and a filtering equivalent to a frequency-dependent magnitude as is the case in the present embodiment.
  • This technique can be generalized to several additional source points that would be positioned for example on either side of the device described above, and this, step by step, to gain control of even lower frequencies, and correlate it to other sections .
  • a variable directivity loudspeaker system is obtained not only by the variability of the flap orientation, but also by the coordinated variability of the processing applied by the DSP component.
  • the acute transducers 1 are here fed by a DSP component included in a control module which implements, besides the digital signal processing, also an amplification.
  • the high-pass transition filter between medium and high frequencies is set to a value Fc.
  • the gain and delay of the acute section are set relative to the mid-section so that the acoustic summation is most favorable over the widest angular sector, 110 ° in the present example.
  • a gain attenuation is implemented over a frequency range [Fc, Frc] with respect to the nominal gain over the frequency range below Frc, a value of less than 6 dB depending on the flap orientation, Frc variant between Fc and Fc x 2.5 depending on the orientation of the shutters 6.
  • the medium transducers 4 are also powered by a control module producing the digital signal processing and amplification, these modules being here one in number for each type of transducer but which can alternatively be replaced by a plurality of control modules by example each associated with a transducer respective.
  • the control module is here arranged externally to the loudspeaker system shown in the figures, but as a variant it can be integrated in such a loudspeaker system.
  • the transition low-pass filter between medium and high frequencies is fixed at Fc
  • a crossover low-pass filter between the frequencies of the medium transducer 4 and the acute transducer 1 being fixed at the value Frc
  • Frc Frc varying between Fc and Fc x 2.5 according to the orientation of flaps 6.
  • a gain attenuation in the range [Fc, Frc] with respect to the nominal gain over the frequency range below Frc is set here implemented with an attenuation value greater than 6 dB.
  • the present speaker system is a portable one or two person system using handles at the ends of the present system.
  • the frequencies and attenuations given in the table according to which frequencies and attenuations are given as a function of the desired directivity are implemented, these frequencies and attenuations being able to vary as a function of the physical configuration of the transducers. values are further given here for a value of Fc equal to 1 kHz.
  • the described device combines a mechanical adjustment of the sound source by the use of the adjustable flaps 6 acting on the acute section, and a DSP component adjustment of the low-frequency transducers 5, medium 4 and treble 1, implementing a common frequency range at least two types of transducers, which common frequency range is here variable depending on the orientation of the flaps of the acute 6.
  • the mechanical and electronic parameters are adjusted to extend the directivity control obtained in the acute at medium frequencies reproduced by the medium transducers 4.
  • the relative magnitude and phase parameters of the transducers are changed by DSP component to obtain a match between the directivity of the treble and the medium. It is thus possible to adjust the directivity of a sound source containing such a device on an angular sector of range between 60 ° and 120 ° with good control from 300 Hz, up to frequencies exceeding 10 kHz.

Abstract

The invention relates to a sound system comprising at least one Digital Signal Processor control module, acting on a signal to the high-frequency transducer (1) and on a signal to mid-frequency transducer (4) in such a way as to apply, in a common frequency range, at least one magnitude parameter as well as at least one phase parameter so as to produce a directivity along the same angular sector as a directivity produced by the orientable shutters (6).

Description

SYSTEME DE SONORISATION A DIRECTIVITE REGLABLE AMELIORE  IMPROVED ADJUSTABLE DIRECTIVITY AUDIO SYSTEM
L'invention concerne le contrôle de la directivité des sources sonores électroacoustiques, qu'elles soient utilisées en sonorisation professionnelle, institutionnelle ou domestique. The invention relates to the control of the directivity of electroacoustic sound sources, whether they are used in professional, institutional or domestic sound systems.
Les sources sonores électroacoustiques sont communément appelées « enceinte acoustique », « système de haut-parleurs », « ligne source » ou « enceinte ou système de sonorisation ».  Electroacoustic sound sources are commonly referred to as "loudspeakers", "speaker systems", "source lines" or "loudspeakers or sound systems".
Parmi les caractéristiques essentielles qualifiant une source sonore, la directivité, et plus particulièrement la manière de contrôler cette dernière sur une partie définie du spectre sonore, joue un rôle capital dans les applications professionnelles. La directivité exprime généralement un angle correspondant au secteur angulaire pour lequel le niveau de pression sonore ou SPL pour Sound Pressure Level en anglais est constant sur une plage de fréquences spécifiée par le constructeur. On dira ainsi que telle source sonore présente, par exemple, une directivité horizontale de 90° , contrdée de 1 kHz à 10kHz. Selon des convenances internationales, le terme « contrôlé » sous-entend que le SPL est constant à +/- 3dB près sur un secteur de 90° entre 1 kHz et 10kHz, tandis que l'atténuation du SPL à l'extérieur de ce secteur angulaire doit être aussi élevée que possible, typiquement supérieure à 6dB.  Among the essential characteristics qualifying a sound source, the directivity, and more particularly the way to control it on a defined part of the sound spectrum, plays a capital role in the professional applications. The directivity generally expresses an angle corresponding to the angular sector for which the level of sound pressure or SPL for Sound Pressure Level in English is constant over a frequency range specified by the manufacturer. It will be said that such sound source has, for example, a horizontal directivity of 90 °, controlled from 1 kHz to 10 kHz. According to international conventions, the term "controlled" implies that the SPL is constant within +/- 3dB on a sector of 90 ° between 1 kHz and 10 kHz, while the attenuation of the SPL outside this sector angular should be as high as possible, typically greater than 6dB.
En sonorisation professionnelle, la directivité d'une source sonore distingue deux plans, le plan horizontal et le plan vertical, pour lesquels cette caractéristique présente généralement des valeurs différentes. L'art du contrôle de la directivité des sources sonores remonte à l'origine des haut-parleurs.  In professional sound systems, the directivity of a sound source distinguishes two planes, the horizontal plane and the vertical plane, for which this characteristic generally has different values. The art of controlling the directivity of sound sources goes back to the origin of the speakers.
De nos jours, il existe deux méthodes indépendantes capables de contrôler la directivité des sources sonores. La première est traditionnellement mécanique : elle s'appuie très largement sur l'utilisation de pavillons sonores, et/ou de l'arrangement en réseau de transducteurs multiples. Les produits « sources sonores » appartenant à cette classe, dans le secteur professionnel ou non, présentent pour un plan donné, horizontal ou vertical, une seule directivité, fixée une fois pour toutes par la configuration matérielle des composants de l'enceinte acoustique. Le choix des transducteurs, leur fréquence de raccordement, le type de pavillon ou guide d'onde monté devant l'orifice de moteurs à chambre de compression ou de haut-parleurs électrodynamiques détermine ainsi les caractéristiques de directivité de la source sonore sur une bande spectrale plus ou moins étendue.  Nowadays, there are two independent methods that can control the directivity of sound sources. The former is traditionally mechanical: it relies heavily on the use of sound horns, and / or the network arrangement of multiple transducers. The "sound source" products belonging to this class, in the professional sector or not, present for a given horizontal or vertical plane, a single directivity, fixed once and for all by the hardware configuration of the components of the acoustic enclosure. The choice of transducers, their frequency of connection, the type of flag or waveguide mounted in front of the orifice of compression chamber motors or electrodynamic loudspeakers thus determines the directivity characteristics of the sound source over a spectral band. more or less extensive.
Il convient de rappeler que seules les fréquences moyennes et aiguës peuvent être contrôlées, sachant que toutes les fréquences dont la longueur d'onde dépasse largement les dimensions physiques de l'objet source sonore ne sont pas réputées pouvoir être contrôlées en vertu de lois physiques incontournables. Il est ainsi illusoire de contrôler des fréquences inférieures à 100Hz soit une longueur d'onde supérieure à 3,4 mètres si l'enceinte acoustique est un cube de 30 cm d'arête. Aux fréquences moyennes, c'est-à-dire pour des haut-parleurs médium dont les fréquences sont typiquement comprises entre environ 200Hz et environ 1 kHz, on pourra obtenir un contrôle satisfaisant par un arrangement ad hoc des transducteurs, en jouant sur les interférences entre haut-parleurs multiples. Aux fréquences élevées, c'est-à-dire pour des haut-parleurs aigus dont les fréquences sont typiquement comprises entre environ 1 kHz et environ 10kHz, il est nécessaire de monter des guides d'onde et/ou pavillons devant l'orifice ou embouchure des haut-parleurs d'aigus souvent appelés des « tweeters » en anglais, ou des moteurs à chambre de compression pour obtenir par la forme du guide et/ou du pavillon la directivité souhaitée. It should be recalled that only the medium and high frequencies can be controlled, since all frequencies whose wavelength greatly exceeds the physical dimensions of the sound source object are not considered to be able to be controlled under unavoidable physical laws. It is thus illusory to control frequencies lower than 100 Hz, ie a wavelength greater than 3.4 meters if the loudspeaker is a cube of 30 cm of edge. At medium frequencies, ie for mid-range speakers whose frequencies are typically between about 200 Hz and about 1 kHz, satisfactory control can be obtained by ad hoc arrangement of the transducers, playing on the interferences between multiple speakers. At high frequencies, i.e. for high-frequency speakers whose frequencies are typically between about 1 kHz and about 10 kHz, it is necessary to mount waveguides and / or horns in front of the orifice or mouthpieces of tweeters often called "tweeters" in English, or compression chamber motors to obtain the shape of the guide and / or flag the desired directivity.
L'intérêt de l'approche mécanique réside dans sa simplicité de conception et son coût modéré, offrant des résultats intéressants aux fréquences moyennes et élevées. L'inconvénient dû à la fixité mécanique est de ne pas pouvoir proposer à l'utilisateur plusieurs choix de directivité dans un même produit.  The advantage of the mechanical approach lies in its simplicity of design and its moderate cost, offering interesting results at medium and high frequencies. The disadvantage due to the mechanical fixity is not being able to offer the user several choices of directivity in the same product.
Cet inconvénient a poussé à introduire des pavillons ou guides d'onde à géométrie variable, en insérant des volets orientables à la sortie de guides d'ondes, réglés par l'utilisateur en fonction de son choix. On connaît également un dispositif portant le nom de Outline MINI COM.P.A.S.S. - marque déposée - lequel appartient à la première classe de sources sonores à action mécanique, avec des éléments orientables, dans lesquels sont montés les transducteurs de médium. Malheureusement de tels réglages n'agissant que sur certains paramètres physiques de l'ensemble médium/aigu, ils ne présentent un niveau de performance que limité sur l'ensemble de la plage de fréquences recherchée.  This disadvantage has led to the introduction of pavilions or waveguides with variable geometry, by inserting adjustable flaps at the output of waveguides, adjusted by the user according to his choice. There is also known a device called Outline MINI COM.P.A.S.S. - registered trademark - which belongs to the first class of sound sources with mechanical action, with adjustable elements, in which are mounted the medium transducers. Unfortunately such adjustments acting only on certain physical parameters of the medium / high range, they have a level of performance that is limited over the entire range of frequencies sought.
La deuxième manière de contrôler la directivité est apparue au cours des dix dernières années, elle repose sur le recours électronique fourni par les composants de type DSP pour Digital Signal Processor en anglais - ou processeur de signal numérique en français - . Des transducteurs souvent identiques sont associés selon un arrangement physique prédéfini. Les transducteurs opèrent sur une plage de fréquences commune choisie par le constructeur. Grâce au composant DSP sont appliqués à au moins un des transducteurs des paramètres de magnitude et de phase en d'autres termes de filtrage, gain, déphasage, délai permettant de modifier et contrôler la directivité de l'ensemble de haut-parleurs, considéré comme une source sonore complexe. L'intérêt de cette approche réside dans son pouvoir de proposer des directivités différentes pour une même configuration physique. Elle implique toujours un nombre de transducteurs important pour obtenir une qualité élevée du contrôle. Son inconvénient est son coût élevé car elle met typiquement en œuvre un composant DSP à amplification par transducteur et elle implique une quasi-impossibilité d'adresser le contrôle des fréquences très élevées, dès que la longueur d'onde devient bien plus petite que la taille de chaque transducteur, typiquement au-dessus de 4kHz. The second way of controlling directivity has emerged over the past decade, relying on the electronic recourse provided by the DSP components for Digital Signal Processor in English - or digital signal processor in French. Often identical transducers are associated according to a predefined physical arrangement. The transducers operate on a common frequency range chosen by the manufacturer. With the aid of the DSP component are applied to at least one of the transducers magnitude and phase parameters in other terms of filtering, gain, phase shift, delay for modifying and controlling the directivity of the set of speakers, considered as a complex sound source. The advantage of this approach lies in its power to propose different directivities for the same physical configuration. It always involves a large number of transducers to obtain a high quality of control. Its disadvantage is its high cost since it typically implements a DSP component with amplification by transducer and it implies a virtual impossibility of addressing the control very high frequencies, as soon as the wavelength becomes much smaller than the size of each transducer, typically above 4kHz.
Ainsi, le dispositif présenté dans le document EP 1 635 606 appartient à la première classe de sources sonores à action mécanique, avec des volets réglables agissant mécaniquement et acoustiquement sur les transducteurs médiums et aigus. Le procédé utilise des paramètres DSP différents pour des réglages de volets différents, dans l'unique but de linéariser la réponse en fréquence. Il n'y a pas de plage de fréquence commune aux transducteurs médiums et aigus. La fréquence de raccordement entre transducteurs médiums et aigus est fixe, donc indépendante de l'orientation des volets.  Thus, the device presented in EP 1 635 606 belongs to the first class of sound sources with mechanical action, with adjustable flaps acting mechanically and acoustically on the medium and treble transducers. The method uses different DSP parameters for different flap settings, for the sole purpose of linearizing the frequency response. There is no common frequency range for the midrange and treble transducers. The frequency of connection between mid and high-frequency transducers is fixed, thus independent of the flap orientation.
Le but de l'invention est de pallier aux inconvénients des systèmes de haut-parleurs connus, en proposant un système qui présente une directivité particulièrement efficace et qui soit d'une confection suffisamment simple.  The object of the invention is to overcome the disadvantages of known loudspeaker systems, by proposing a system which has a particularly effective directivity and which is of a sufficiently simple construction.
Ce but est atteint selon l'invention grâce à un système de sonorisation, comprenant au moins un transducteur sonore aigu et au moins un transducteur sonore médium, des volets orientables agissant sur une émission sonore du transducteur sonore aigu pour produire une directivité d'émission sonore du transducteur sonore aigu selon un secteur angulaire choisi, caractérisé en ce qu'il est configuré pour que le transducteur sonore médium et le transducteur sonore aigu émettent sur une plage de fréquences commune et il comprend au moins un module de commande de type - Processeur de Signal Numérique - agissant sur un signal à destination du transducteur sonore aigu et sur un signal à destination du transducteur sonore médium de manière à appliquer dans la plage de fréquences commune au moins un paramètre de magnitude sur le transducteur sonore aigu (1 ) et/ou sur le transducteur sonore médium ainsi qu'au moins un paramètre de phase sur le transducteur sonore aigu et/ou sur le transducteur sonore médium de manière à produire une directivité d'émission sonore du couple constitué du transducteur sonore aigu et du transducteur sonore médium selon le même secteur angulaire choisi que la directivité produite par les volets orientables.  This object is achieved according to the invention by means of a sound system, comprising at least one acute sound transducer and at least one medium sound transducer, orientable flaps acting on a sound emission of the high-pitched sound transducer to produce a sound emission directivity of the acute sound transducer according to a selected angular sector, characterized in that it is configured so that the medium sound transducer and the acute sound transducer emit over a common frequency range and it comprises at least one control module of Digital signal - acting on a signal to the acute sound transducer and on a signal to the mid-range sound transducer so as to apply in the common frequency range at least one magnitude parameter on the acute sound transducer (1) and / or on the medium sound transducer as well as at least one phase parameter on the acute sound transducer and / or ur medium sound transducer so as to produce a sound emission directivity of the pair consisting of the acute sound transducer and the medium sound transducer according to the same angular sector selected as the directivity produced by the adjustable flaps.
Avantageusement, les volets orientables et le module de commande de type DSP sont configurés de telle sorte qu'ils génèrent chacun une présence des ondes sonores selon un niveau sonore sensiblement constant dans ledit secteur angulaire choisi, les volets orientables et le module de commande de type DSP étant configurés de telle sorte qu'ils atténuent les ondes sonores en tout angle extérieur audit secteur angulaire choisi selon une atténuation supérieure à 6 dB par rapport au niveau sonore le plus élevé dans ledit secteur angulaire choisi.  Advantageously, the adjustable flaps and the control module of the DSP type are configured in such a way that they each generate a presence of the sound waves at a substantially constant sound level in said selected angular sector, the adjustable flaps and the control module of the following type. DSPs are configured such that they attenuate the sound waves at any angle outside said selected angular sector at an attenuation greater than 6 dB from the highest sound level in said selected angular sector.
Avantageusement, le système de sonorisation est configuré de telle sorte que la plage de fréquences commune est variable en fonction de l'orientation des volets orientables. Avantageusement, le système de sonorisation comprend au moins deux transducteurs sonores médium et au moins un transducteur sonore aigu, les transducteurs sonores médium étant disposés de part et d'autre du transducteur sonore aigu. Advantageously, the sound system is configured so that the common frequency range is variable depending on the orientation of the adjustable flaps. Advantageously, the sound system comprises at least two medium sound transducers and at least one acute acoustic transducer, the medium sound transducers being arranged on either side of the acute sound transducer.
Avantageusement, le système de sonorisation comporte un boîtier entourant au moins partiellement un des volets, ledit au moins un des volets présentant une surface orientée en vis-à-vis d'un flux sonore émis par ledit transducteur sonore aigu et une surface orientée en éloignement du flux sonore émis par ledit transducteur sonore aigu, le boîtier formant obstacle devant la surface du volet (6) orientée en éloignement du flux sonore émis par le transducteur sonore aigu de manière à protéger cette surface contre un choc par un objet étranger.  Advantageously, the sound system comprises a housing at least partially surrounding one of the flaps, said at least one of the flaps having a surface oriented vis-à-vis a sound flow emitted by said acute sound transducer and a surface oriented away from the sound flux emitted by said high-frequency sound transducer, the obstacle-forming housing in front of the surface of the flap (6) oriented away from the sound flux emitted by the acute sound transducer so as to protect this surface against impact by a foreign object.
Avantageusement, ledit au moins un transducteur sonore médium comporte une membrane mobile de forme sensiblement conique et le boîtier dudit au moins un volet est conformé de manière à épouser une partie de la forme sensiblement conique de la membrane.  Advantageously, said at least one medium sound transducer comprises a movable membrane of substantially conical shape and the housing of said at least one flap is shaped to fit a portion of the substantially conical shape of the membrane.
Avantageusement, le système de sonorisation constitue un système de sonorisation portatif.  Advantageously, the sound system is a portable sound system.
Avantageusement, le système de sonorisation comporte au moins deux transducteurs sonores graves et les dits au moins deux transducteurs sonores graves sont disposés de part et d'autre d'un ensemble constitué par ledit au moins un transducteur sonore aigu et lesdits au moins deux transducteurs sonores médium.  Advantageously, the sound system comprises at least two serious sound transducers and said at least two serious sound transducers are disposed on either side of an assembly constituted by said at least one acute sound transducer and said at least two sound transducers. medium.
Avantageusement, le système de sonorisation comporte au moins un guide d'onde qui véhicule des ondes sonores émises par le transducteur sonore aigu.  Advantageously, the sound system comprises at least one waveguide which conveys sound waves emitted by the acute sound transducer.
Avantageusement, le système de sonorisation comporte une fente par laquelle sont émises les ondes sonores produites par le transducteur sonore aigu, lesdits au moins deux transducteurs sonores médium étant disposés de part et d'autre de la fente.  Advantageously, the sound system comprises a slot through which sound waves produced by the acute sound transducer are emitted, said at least two medium sound transducers being disposed on either side of the slot.
D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, faite en référence aux figures annexées sur lesquelles : - La figure 1 représente en coupe un système de haut-parleurs selon un mode de réalisation de l'invention.  Other features, objects and advantages of the invention will appear on reading the detailed description which follows, with reference to the appended figures in which: - Figure 1 shows in section a loudspeaker system according to a method of embodiment of the invention.
- La figure 2 représente en coupe une partie à volets orientables de ce même système de haut-parleurs. - Figure 2 shows in section a portion with adjustable flaps of the same system of speakers.
Le système de haut-parleurs représenté sur la figure 1 comporte un arrangement en K des transducteurs médiums et aigus. Ce système de haut-parleurs vu de face est symétrique par rapport au plan vertical traversant le système en son milieu. En partant du milieu de la face avant, se trouvent des moteurs à chambre de compression 1 montés en ligne couplés à des guides d'onde superposés 2 présentant sur la face avant une sortie en forme de fente longitudinale verticale 3. De part et d'autre de cette fente 3 sont montés sur la face avant des transducteurs de médium 4 situés au plus près de la fente 3. De part et d'autre de ces transducteurs de médium 4 sont montés des transducteurs de graves 5 situés à proximité de la section médium. The loudspeaker system shown in Figure 1 has a K arrangement of the mid and high transducers. This speaker system seen from the front is symmetrical with respect to the vertical plane passing through the system in the middle. Starting from the middle of the front face, there are compression chamber motors 1 mounted in line coupled to superimposed waveguides 2 having on the front face an outlet in the form of a vertical longitudinal slot 3. On both sides other of this slot 3 are mounted on the front face of medium transducers 4 located closer to the slot 3. On either side of these medium transducers 4 are mounted bass drivers 5 located near the mid section.
Les transducteurs aigus 1 émettent des fréquences aiguës qui sont des fréquences comprises entre environ 1 kHz et environ 10kHz. Les transducteurs médium émettent des fréquences médium qui sont des fréquences comprises entre environ 200Hz et environ 1 kHz. Les transducteurs de graves émettent des fréquences graves qui sont des fréquences inférieures à environ 200Hz.  The acute transducers 1 emit high frequencies which are frequencies between about 1 kHz and about 10 kHz. The midrange transducers emit medium frequencies which are frequencies between about 200Hz and about 1kHz. The bass transducers emit bass frequencies that are frequencies below about 200Hz.
De part et d'autre de la fente 3 ont été ajoutées des parois 6 occultant partiellement les transducteurs de médium 4 et dont l'orientation permet de diriger les fréquences élevées rayonnées par le transducteur aigu 1 dans un secteur angulaire correspondant à la directivité de l'aigu.  On either side of the slot 3 have been added walls 6 partially obscuring the medium transducers 4 and whose orientation makes it possible to direct the high frequencies radiated by the acute transducer 1 into an angular sector corresponding to the directivity of the 'acute.
Ces parois 6 forment ici des volets orientables. On met ainsi en œuvre un réglage mécanique de ces volets orientables 6 à la sortie du guide d'onde 2 lui-même raccordé à l'orifice du transducteur à hautes fréquences 1 constitué ici d'un moteur à chambre de compression. L'ensemble est positionné entre deux ou plusieurs transducteurs médium 4 montés en radiation directe sur un plan fixe, de manière à ce que le dispositif complet présente, de face, une symétrie par rapport à un plan vertical. Les volets 6 situés à la sortie des guides d'onde 2 sont ici mobiles avec une présélection de plusieurs orientations.  These walls 6 form here orientable flaps. A mechanical adjustment of these pivotable flaps 6 is thus implemented at the output of the waveguide 2 itself connected to the orifice of the high-frequency transducer 1, here constituted by a compression chamber motor. The assembly is positioned between two or more medium transducers 4 mounted in direct radiation on a fixed plane, so that the complete device has, from the front, a symmetry with respect to a vertical plane. The flaps 6 located at the output of the waveguides 2 are here movable with a preselection of several orientations.
Les volets 6 sont ici emprisonnés dans deux boîtiers respectifs 7. Chacun des boîtiers 7 s'étend autour d'un espace délimité par la face inférieure du volet 6 tournée en éloignement du flux sonore aigu. Les boîtiers 7 protègent ainsi les volets 6 de telle sorte qu'aucun objet extérieur ne peut venir au contact du volet sous celui-ci. Chacun des boîtiers 7 héberge et protège également un système de rotation et de présélection d'orientation du volet correspondant 6. Dans le présent mode de réalisation, les boîtiers 7 présentent chacun une partie venant en recouvrement d'un transducteur médium respectif. Dans cette partie de recouvrement, chaque boîtier 7 pénètre dans l'espace conique délimité par la membrane mobile du transducteur médium 4 considéré et épouse la forme de la membrane. Cette partie de recouvrement joue ainsi le rôle d'une chambre de compression médium.  The flaps 6 are here imprisoned in two respective housings 7. Each of the housings 7 extends around a space defined by the lower face of the shutter 6 turned away from the high-frequency sound flow. The housings 7 thus protect the flaps 6 so that no external object can come into contact with the flap under it. Each of the housings 7 also houses and protects an orientation rotation and preselection system of the corresponding flap 6. In the present embodiment, the housings 7 each have a portion overlapping a respective medium transducer. In this covering part, each housing 7 enters the conical space delimited by the movable membrane of the medium transducer 4 considered and matches the shape of the membrane. This covering part thus plays the role of a medium compression chamber.
Les volets 6 sont ici orientables individuellement de sorte que l'on peut adopter avec le présent système un réglage asymétrique de l'orientation du flux sonore, que ce soit vers la droite ou vers la gauche selon que l'un ou l'autre des volets est disposé dans la position la plus relevée.  The shutters 6 are here individually adjustable so that one can adopt with the present system an asymmetrical adjustment of the direction of the sound flow, either to the right or to the left depending on whether one or other of the flaps is arranged in the most raised position.
La rotation des volets 6 permet de modifier la directivité de l'aigu sur la plage de fonctionnement des transducteurs aigus, typiquement sur la plage des fréquences supérieures à 800Hz, à la condition toutefois que la taille des volets 6, en mode ouvert ou fermé, soit suffisante pour garantir un contrôle efficace. En effet, il convient de noter la perte de contrôle de directivité à mesure que l'on resserre les volets selon un secteur angulaire étroit en raison de dimensions physiques trop petites à la sortie des volets. The rotation of the flaps 6 makes it possible to modify the directivity of the acute over the operating range of the acute transducers, typically over the frequency range greater than 800 Hz, provided however that the size of the flaps 6, in open or closed mode, sufficient to ensure effective control. Indeed, it is worth noting the loss directional control as the flaps are narrowed in a narrow angular sector because of too small physical dimensions at the exit of the flaps.
Pour annuler cet effet, on introduit dans le présent système un réglage sur les transducteurs médium qui active progressivement ces transducteurs par DSP pour compenser acoustiquement la perte de contrôle de l'aigu dans sa partie basse.  To cancel this effect, we introduce in the present system a setting on the medium transducers which gradually activates these transducers by DSP to acoustically compensate for the loss of control of the treble in its lower part.
Dans le présent dispositif, les transducteurs médiums 4 et aigus 1 opèrent sur une plage de fréquences commune et un composant DSP fixe les paramètres de magnitude et de phase des transducteurs aigu 1 et médium 4 dans la plage de fréquences commune de manière à ce que la directivité obtenue par de tels paramètres soit la même que la directivité produite par le réglage des volets 6 dans les fréquences aiguës. Pour cela, on combine électroniquement par DSP au moins les trois points source que sont le transducteur aigu 1 positionné au centre et les deux transducteurs médium identiques 4 situés de part et d'autre, de telle sorte que de manière connue en soi la sommation acoustique résultante se traduise par la directivité recherchée.  In the present device, the mid and high-frequency transducers 1 operate on a common frequency range and a DSP component sets the magnitude and phase parameters of the acute 1 and medium 4 transducers in the common frequency range so that the directivity obtained by such parameters is the same as the directivity produced by the adjustment of flaps 6 in the high frequencies. For this purpose, at least the three source points are combined electronically by means of DSP, namely the acute transducer 1 positioned in the center and the two identical medium transducers 4 situated on either side, so that, in a manner known per se, acoustic summation is known. resulting result in the desired directivity.
Le présent traitement consiste en d'autres termes à régler les paramètres de filtrage, gain, phase et délai, un délai équivalant à un déphasage dépendant de la fréquence et un filtrage équivalant à une magnitude dépendant de la fréquence comme c'est le cas dans le présent mode de réalisation. Cette technique peut se généraliser à plusieurs points source additionnels qui seraient par exemple positionnés de part et d'autre du dispositif précédemment décrit, et ce, de proche en proche, pour gagner le contrôle de fréquences encore plus basses, et le corréler aux autres sections. On obtient ainsi un système de haut- parleurs à directivité variable non seulement de par la variabilité de l'orientation des volets, mais également par la variabilité coordonnée du traitement appliqué par le composant DSP.  The present processing consists of other terms to adjust the parameters of filtering, gain, phase and delay, a delay equivalent to a frequency-dependent phase shift and a filtering equivalent to a frequency-dependent magnitude as is the case in the present embodiment. This technique can be generalized to several additional source points that would be positioned for example on either side of the device described above, and this, step by step, to gain control of even lower frequencies, and correlate it to other sections . Thus, a variable directivity loudspeaker system is obtained not only by the variability of the flap orientation, but also by the coordinated variability of the processing applied by the DSP component.
Les transducteurs aigus 1 sont ici alimentés par un composant DSP inclus dans un module de commande lequel met en œuvre, outre le traitement du signal numérique, également une amplification. Le filtre passe-haut de transition entre fréquences médium et hautes fréquences est fixé à une valeur Fc. Le gain et le délai de la section aiguë sont réglés de manière relative à la section médium de manière à ce que la sommation acoustique soit la plus favorable sur le secteur angulaire le plus large, 110° dans le présent exemple. Une atténuation de gain est mise en œuvre sur une plage de fréquences [Fc, Frc] par rapport au gain nominal sur la plage de fréquences inférieures à Frc, d'une valeur inférieure à 6 dB variant selon l'orientation des volets, Frc variant entre Fc et Fc x 2,5 selon l'orientation des volets 6. Un délai additionnel est appliqué à la section aiguë variant selon l'orientation des volets. Les transducteurs médium 4 sont également alimentés par un module de commande produisant le traitement du signal numérique et l'amplification, ces modules étant ici au nombre de un pour chaque type de transducteur mais pouvant en variante être remplacé par une pluralité de modules de commande par exemple associés chacun à un transducteur respectif. Le module de commande est ici disposé de manière externe au système de haut- parleurs représenté sur les figures, mais en variante il peut être intégré dans un tel système de haut-parleurs. The acute transducers 1 are here fed by a DSP component included in a control module which implements, besides the digital signal processing, also an amplification. The high-pass transition filter between medium and high frequencies is set to a value Fc. The gain and delay of the acute section are set relative to the mid-section so that the acoustic summation is most favorable over the widest angular sector, 110 ° in the present example. A gain attenuation is implemented over a frequency range [Fc, Frc] with respect to the nominal gain over the frequency range below Frc, a value of less than 6 dB depending on the flap orientation, Frc variant between Fc and Fc x 2.5 depending on the orientation of the shutters 6. An additional delay is applied to the acute section varying according to the orientation of the shutters. The medium transducers 4 are also powered by a control module producing the digital signal processing and amplification, these modules being here one in number for each type of transducer but which can alternatively be replaced by a plurality of control modules by example each associated with a transducer respective. The control module is here arranged externally to the loudspeaker system shown in the figures, but as a variant it can be integrated in such a loudspeaker system.
Si les transducteurs de médium 4 sont associés en parallèle, le filtre passe-bas de transition entre fréquences moyennes et hautes fréquences est fixé à Fc, un filtre passe-bas de recouvrement entre fréquences du transducteur médium 4 et du transducteur aigu 1 étant fixé à la valeur Frc, Frc variant entre Fc et Fc x 2,5 selon l'orientation des volets 6. Une atténuation de gain sur la plage [Fc, Frc] par rapport au gain nominal sur la plage de fréquence inférieure à Frc est ici mis en œuvre avec une valeur d'atténuation supérieure à 6 dB.  If the midrange transducers 4 are associated in parallel, the transition low-pass filter between medium and high frequencies is fixed at Fc, a crossover low-pass filter between the frequencies of the medium transducer 4 and the acute transducer 1 being fixed at the value Frc, Frc varying between Fc and Fc x 2.5 according to the orientation of flaps 6. A gain attenuation in the range [Fc, Frc] with respect to the nominal gain over the frequency range below Frc is set here implemented with an attenuation value greater than 6 dB.
Le présent système de haut-parleurs est un système portatif par une ou deux personnes, à l'aide de poignées disposées aux extrémités du présent système.  The present speaker system is a portable one or two person system using handles at the ends of the present system.
Ainsi, on met en œuvre dans le présent exemple de réalisation les fréquences et atténuations données dans le tableau suivant lesquelles fréquences et atténuations sont données en fonction de la directivité souhaitée, ces fréquences et atténuations pouvant varier en fonction de la configuration physique des transducteurs, les valeurs étant en outre données ici pour une valeur de Fc égale à 1 kHz.  Thus, in the present embodiment, the frequencies and attenuations given in the table according to which frequencies and attenuations are given as a function of the desired directivity are implemented, these frequencies and attenuations being able to vary as a function of the physical configuration of the transducers. values are further given here for a value of Fc equal to 1 kHz.
Secteur angulaire des volets 700 Angular sector of shutters 70 0
SECTION MEDIUM Fréquence de transition Fc (Hz) Fc Fréquence de recouvrement Frc (Hz) 2,5 x Fc Atténuation sur la plage Fc-Frc -11 dB MEDIUM SECTION Transition Frequency Fc (Hz) Fc Override Frequency Frc (Hz) 2.5 x Fc Attenuation over Fc-Frc Range -11 dB
SECTION AIGUË Fréquence de transition Fc (Hz) Fc Atténuation sur la plage Fc-Frc -3dB Délai additionnel de couplage (ms) -0,2 à -0,4 Le dispositif décrit combine un réglage mécanique de la source sonore par l'utilisation des volets orientables 6 agissant sur la section aiguë, et un réglage par composant DSP des transducteurs graves 5, médiums 4 et aigus 1 , mettant en œuvre une plage de fréquences commune à au moins deux types de transducteurs, laquelle plage de fréquences commune étant ici variable en fonction de l'orientation des volets de l'aigu 6. Les paramètres mécaniques et électroniques sont ajustés de manière à étendre le contrôle de directivité obtenu dans l'aigu aux fréquences moyennes reproduites par les transducteurs médium 4. Ainsi on change par composant DSP les paramètres relatifs de magnitude et de phase des transducteurs pour obtenir une adéquation entre la directivité de l'aigu et du médium. Il est ainsi possible d'ajuster la directivité d'une source sonore contenant un tel dispositif sur un secteur angulaire d'étendue située entre 60 ° et 120° avec un bon contrôle à partir de 300Hz, jusqu'à des fréquences excédant 10kHz. ACUTE SECTION Transition Frequency Fc (Hz) Fc Attenuation over the range Fc-Frc -3dB Additional coupling delay (ms) -0.2 to -0.4 The described device combines a mechanical adjustment of the sound source by the use of the adjustable flaps 6 acting on the acute section, and a DSP component adjustment of the low-frequency transducers 5, medium 4 and treble 1, implementing a common frequency range at least two types of transducers, which common frequency range is here variable depending on the orientation of the flaps of the acute 6. The mechanical and electronic parameters are adjusted to extend the directivity control obtained in the acute at medium frequencies reproduced by the medium transducers 4. Thus, the relative magnitude and phase parameters of the transducers are changed by DSP component to obtain a match between the directivity of the treble and the medium. It is thus possible to adjust the directivity of a sound source containing such a device on an angular sector of range between 60 ° and 120 ° with good control from 300 Hz, up to frequencies exceeding 10 kHz.

Claims

REVENDICATIONS
1 . Système de sonorisation, comprenant au moins un transducteur sonore aigu (1 ) et au moins un transducteur sonore médium (4), des volets orientables (6) agissant sur une émission sonore du transducteur sonore aigu (1 ) pour produire une directivité d'émission sonore du transducteur sonore aigu (1 ) selon un secteur angulaire choisi, caractérisé en ce qu'il est configuré pour que le transducteur sonore médium (4) et le transducteur sonore aigu (1 ) émettent sur une plage de fréquences commune et il comprend au moins un module de commande de type processeur de signal numérique agissant sur un signal à destination du transducteur sonore aigu (1 ) et sur un signal à destination du transducteur sonore médium (4) de manière à appliquer dans la plage de fréquences commune au moins un paramètre de magnitude sur le transducteur sonore aigu (1 ) et/ou sur le transducteur sonore médium (4) ainsi qu'au moins un paramètre de phase sur le transducteur sonore aigu (1 ) et/ou sur le transducteur sonore médium (4) de manière à produire une directivité d'émission sonore du couple constitué du transducteur sonore aigu (1 ) et du transducteur sonore médium (4) selon le même secteur angulaire choisi que la directivité produite par les volets orientables (6). 1. Sound system comprising at least one acute sound transducer (1) and at least one medium sound transducer (4), adjustable flaps (6) acting on a sound emission of the high-frequency sound transducer (1) to produce an emission directivity the sound transducer of the acute sound transducer (1) according to a selected angular sector, characterized in that it is configured so that the medium sound transducer (4) and the acute sound transducer (1) emit over a common frequency range and includes minus a digital signal processor type control module acting on a signal to the high-frequency sound transducer (1) and on a signal to the mid-range sound transducer (4) so as to apply in the common frequency range at least one magnitude parameter on the acute sound transducer (1) and / or on the medium sound transducer (4) and at least one phase parameter on the acute sound transducer (1) and / or on the e medium sound transducer (4) so as to produce a sound emission directivity of the pair consisting of the acute sound transducer (1) and the medium sound transducer (4) according to the same angular sector chosen as the directivity produced by the adjustable flaps ( 6).
2. Système de sonorisation selon la revendication 1 , caractérisé en ce que les volets orientables (6) et le module de commande de type DSP sont configurés de telle sorte qu'ils génèrent chacun une présence des ondes sonores selon un niveau sonore sensiblement constant dans ledit secteur angulaire choisi, les volets orientables (6) et le module de commande de type DSP étant configurés de telle sorte qu'ils atténuent les ondes sonores en tout angle extérieur audit secteur angulaire choisi selon une atténuation supérieure à 6 dB par rapport au niveau sonore maximal dans ledit secteur angulaire choisi.  2. PA system according to claim 1, characterized in that the adjustable flaps (6) and the control module of the DSP type are configured so that they each generate a presence of sound waves at a substantially constant sound level in said selected angular sector, the adjustable flaps (6) and the DSP type control module being configured so that they attenuate the sound waves at any angle outside said selected angular sector with an attenuation greater than 6 dB relative to the level maximum sound in said selected angular sector.
3. Système de sonorisation selon la revendication 1 ou la revendication 2, caractérisé en ce qu'il est configuré de telle sorte que la plage de fréquences commune est variable en fonction de l'orientation des volets orientables (6).  3. PA system according to claim 1 or claim 2, characterized in that it is configured such that the common frequency range is variable depending on the orientation of the adjustable flaps (6).
4. Système de sonorisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend au moins deux transducteurs sonores médium (4) et au moins un transducteur sonore aigu (1 ), les transducteurs sonores médium (4) étant disposés de part et d'autre du transducteur sonore aigu (1 ).  4. PA system according to any one of the preceding claims, characterized in that it comprises at least two medium sound transducers (4) and at least one acute sound transducer (1), the medium sound transducers (4) being arranged on either side of the acute sound transducer (1).
5. Système de sonorisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte un boîtier (7) entourant au moins partiellement un des volets (6), ledit au moins un des volets présentant une surface orientée en vis-à-vis d'un flux sonore émis par ledit transducteur sonore aigu (1 ) et une surface orientée en éloignement du flux sonore émis par ledit transducteur sonore aigu (1 ), le boîtier (7) formant obstacle devant la surface du volet (6) orientée en éloignement du flux sonore émis par le transducteur sonore aigu (1 ) de manière à protéger cette surface contre un choc par un objet étranger. 5. A sound system according to any one of the preceding claims, characterized in that it comprises a housing (7) at least partially surrounding one of the flaps (6), said at least one of the flaps having a surface oriented towards with respect to a sound flux emitted by said acute sound transducer (1) and a surface oriented away from the sound flux emitted by said acute sound transducer (1), the housing (7) forming an obstacle in front of the flap surface (6) oriented away from the sound flux emitted by the acute sound transducer (1) so as to protect the surface against shock by a foreign object.
6. Système de sonorisation selon la revendication précédente, caractérisé en ce que ledit au moins un transducteur sonore médium (4) comporte une membrane mobile de forme sensiblement conique et le boîtier (7) dudit au moins un volet (6) est conformé de manière à épouser une partie de la forme sensiblement conique de la membrane.  6. A sound system according to the preceding claim, characterized in that said at least one medium sound transducer (4) comprises a movable membrane of substantially conical shape and the housing (7) of said at least one flap (6) is shaped so to conform to a portion of the substantially conical shape of the membrane.
7. Système de sonorisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il constitue un système de haut-parleurs portatif.  7. Public address system according to any one of the preceding claims, characterized in that it constitutes a portable loudspeaker system.
8. Système de sonorisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte au moins deux transducteurs sonores graves (5) et les dits au moins deux transducteurs sonores graves (5) sont disposés de part et d'autre d'un ensemble constitué par ledit au moins un transducteur sonore aigu (1 ) et lesdits au moins deux transducteurs sonores médium (4).  8. PA system according to any one of the preceding claims, characterized in that it comprises at least two serious sound transducers (5) and said at least two serious sound transducers (5) are arranged on either side an assembly consisting of said at least one acute sound transducer (1) and said at least two medium sound transducers (4).
9. Système de sonorisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte au moins un guide d'onde (2) qui véhicule des ondes sonores émises par le transducteur sonore aigu (1 ).  9. PA system according to any one of the preceding claims, characterized in that it comprises at least one waveguide (2) which conveys sound waves emitted by the acute sound transducer (1).
10. Système de sonorisation selon la revendication 4, caractérisé en ce qu'il comporte une fente (3) par laquelle sont émises les ondes sonores produites par le transducteur sonore aigu (1 ), lesdits au moins deux transducteurs sonores médium (4) étant disposés de part et d'autre de la fente (3).  10. A sound system according to claim 4, characterized in that it comprises a slot (3) by which are emitted the sound waves produced by the acute sound transducer (1), said at least two medium sound transducers (4) being arranged on either side of the slot (3).
EP13805441.6A 2013-10-30 2013-10-30 Sound system with improved adjustable directivity Active EP3063950B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2013/052604 WO2015063377A1 (en) 2013-10-30 2013-10-30 Sound system with improved adjustable directivity

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EP3063950A1 true EP3063950A1 (en) 2016-09-07
EP3063950B1 EP3063950B1 (en) 2017-08-16

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EP (1) EP3063950B1 (en)
JP (1) JP6416922B2 (en)
CN (1) CN105765996B (en)
BR (1) BR112016009662B1 (en)
CA (1) CA2928995C (en)
DK (1) DK3063950T3 (en)
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DK3063950T3 (en) 2017-10-16
CN105765996A (en) 2016-07-13
CN105765996B (en) 2019-05-28
CA2928995A1 (en) 2015-05-07
CA2928995C (en) 2021-02-16
RU2638081C2 (en) 2017-12-11
ES2642898T3 (en) 2017-11-20
JP2016535966A (en) 2016-11-17
EP3063950B1 (en) 2017-08-16
PT3063950T (en) 2017-10-19
JP6416922B2 (en) 2018-10-31
WO2015063377A1 (en) 2015-05-07
US20160277830A1 (en) 2016-09-22
RU2016121015A (en) 2017-12-05
US9762996B2 (en) 2017-09-12
BR112016009662B1 (en) 2021-01-12

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