EP2721601A2 - Passive polyphonic double-coil microphone for a string musical instrument - Google Patents

Passive polyphonic double-coil microphone for a string musical instrument

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Publication number
EP2721601A2
EP2721601A2 EP12802892.5A EP12802892A EP2721601A2 EP 2721601 A2 EP2721601 A2 EP 2721601A2 EP 12802892 A EP12802892 A EP 12802892A EP 2721601 A2 EP2721601 A2 EP 2721601A2
Authority
EP
European Patent Office
Prior art keywords
coils
magnetic
coil
microphone
pair
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
EP12802892.5A
Other languages
German (de)
French (fr)
Other versions
EP2721601B1 (en
Inventor
La Tour Saint Ygest Emile Vincent De
Pierre CHAZE
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.)
Chaze Pierre
de la Tour Saint Ygest Emile Vincent
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2721601A2 publication Critical patent/EP2721601A2/en
Application granted granted Critical
Publication of EP2721601B1 publication Critical patent/EP2721601B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/18—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a string, e.g. electric guitar
    • G10H3/181—Details of pick-up assemblies
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/18—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a string, e.g. electric guitar
    • G10H3/182—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a string, e.g. electric guitar using two or more pick-up means for each string
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
    • G10H2220/461—Transducers, i.e. details, positioning or use of assemblies to detect and convert mechanical vibrations or mechanical strains into an electrical signal, e.g. audio, trigger or control signal
    • G10H2220/505—Dual coil electrodynamic string transducer, e.g. for humbucking, to cancel out parasitic magnetic fields
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
    • G10H2220/461—Transducers, i.e. details, positioning or use of assemblies to detect and convert mechanical vibrations or mechanical strains into an electrical signal, e.g. audio, trigger or control signal
    • G10H2220/565—Shielding, electromagnetic or magnetic, e.g. for transducers, i.e. for controlling, orienting or suppressing magnetic fields or for preventing unintentional generation, propagation and reception of electromagnetic energy in electrophonic musical instruments, their vicinity or their interconnections

Definitions

  • the present invention relates to the field of amplification of a stringed instrument.
  • micro for stringed instruments
  • micro are well known, they are classically integrated into the body of the musical instrument and there are many documents of the prior art on this subject.
  • conventional magnetic pickups include coils (solenoids) whose output signal depends on the movement of the string.
  • a solenoid produces a magnetic field in its vicinity when it is traversed by a current.
  • a microphone generates an output current in response to the disturbance of the magnetic field of its coils.
  • the disturbance of the magnetic field is in fact due to the vibration of the string (or strings) played by the musician.
  • the variation of the magnetic field creates an induced current, of the same frequency as the vibrating cord, which then needs to be amplified.
  • a single-coil magnetic microphone is composed of a magnet, a coil traversed by the magnetic field of the magnet and a movable diaphragm. Variations in the moving diaphragm modify the magnetic field induced by the magnet which generates a counter-electromotive force in the coils.
  • the movable diaphragm is constituted by the strings.
  • a double-coil magnetic pickup works on the same principle as a single-coil pickup but with two coils electrically connected to each other. An example of these so-called humbuckers microphones is illustrated in Figure 1.
  • two coils are fused that is to say, mounted in series (at the electrical level) and with a reversed magnetic polarity, to cancel the electromagnetic disturbances exterior.
  • These microphones are characterized by a rich sound in bass and midrange and a level of output generally higher than on single coil pickups.
  • the notes played acquire a diffuse sound (the grain or "crunch") that makes them less slamming.
  • This effect obtained by saturation of a conventional amplifier or using an ad hoc effect module (or pedal), proceeds by clipping, compresses the attack of the note played while increasing its harmonics.
  • the signal from a single string is perfectly distinct. Beyond this, for a two-string chord, the signal is still audible but for chords with three or more strings, the output signal is then an unusable noise.
  • the Applicant has filed the patent application FR9607937.
  • the present invention aims to improve the solution proposed in application FR9607937 by proposing a an audible analog solution that allows polyphony for any type of stringed instrument, including distortion.
  • the invention relates to a passive polyphonic double-coil microphone for a stringed musical instrument comprising:
  • each pair of coils comprising a first coil and a second coil, each coil comprising a magnetic core and a coil around said core, an upper face and a lower face,
  • the two coils are electrically connected in series and in magnetic connection with each other.
  • the microphone is essentially characterized in that it further comprises
  • each coil being surrounded by a respective magnetic shielding
  • one of the coils is equipped with an electric wire to be connected to a ground, and the other coil is equipped with another electrical wire for transporting an output signal to a amplifier.
  • the distance separating two coils of the same pair is identical for each pair of coils.
  • each shield has the same magnetic polarity as that of the coil it contains.
  • the pairs of coils are arranged so that the set of first coils are aligned along a first straight line, and all the second coils are aligned along a second straight line.
  • the assembly of at least one internal dipolar magnet comprises:
  • the set of pairs of coils has an upper face, intended to be positioned opposite the strings, and a lower face; said set of at least one inner dipole magnet being positioned on the side of the lower face.
  • a set of at least one external dipole magnet can be provided, in magnetic connection with at least one core and having a reverse magnetic polarity of said core. It can be provided that said set of at least one external dipole magnet is integral with at least one shielding magnetic through an electrical and magnetic insulator.
  • the microphone comprises a first external dipolar magnet common to all the first coils, and a second external dipolar magnet common to all of the second coils.
  • each magnetic shield has a first recess at the top face to facilitate the establishment of field lines between the core of the first coil and the core of the second coil of a given coil pair.
  • each magnetic shield has a second recess at the upper face, to facilitate the establishment of field lines between the core of the coil contained in the shield and the outer dipole magnet in magnetic connection with said core.
  • each magnetic shield has a recess at the lower face, so as to allow the penetration of an end of the inner dipole magnet within the volume that said shield without said recess.
  • all the cores of the first coils have the same magnetic polarity between them, and all the cores of the second coils have the same magnetic polarity between them, inverted with respect to the magnetic polarity of all the cores first coils.
  • the invention relates to a stringed musical instrument equipped with a microphone according to the invention.
  • the invention also relates to a system for amplifying a stringed musical instrument, the system comprising a stringed musical instrument equipped with a microphone according to the invention, and an electrically connectable electrical amplifier device. at the output of said microphone.
  • FIG. 1 illustrates an embodiment of a humbucker microphone according to the prior art
  • FIG. 2 illustrates a partial three-quarter view of an embodiment of the microphone according to the invention
  • FIG. 3 illustrates a cross-section at the level of the cores of a coil pair of an embodiment of the microphone according to the invention
  • FIG. 4 is a top view of an embodiment of the microphone according to the invention.
  • Figure 5 illustrates a cross section of a shield according to the invention.
  • a musical instrument of the six-string electric guitar type As mentioned above, reference is made here to a musical instrument of the six-string electric guitar type.
  • the microphone can be adapted to acoustic guitars, bass guitars, or other string instruments. Whatever the number of strings of the instrument, it is enough to adapt the number of pairs of coils to the number of strings.
  • the passive polyphonic double-coil microphone for a stringed musical instrument comprises a support.
  • the support 11 is substantially flat, that is to say it may have a slight curvature, typically the curvature of the instrument and for example that of the guitar neck, so that it can be integrated more easily into the instrument.
  • the support 11 has a central recess 12, in the plane of the support 11, to facilitate the establishment of the inner magnet (see below). Pairs of coils
  • the microphone 10 comprises a set of pairs of coils 20, 21, 22, 23, 24, 25 etc. whose number of pairs is equal to the number of strings. Each pair of coils is intended to be positioned facing a respective rope 13, so that each pair of coils faces a respective rope. The magnetic cores of the same pair of coils are positioned to capture the vibrations of one and the same string.
  • Each pair of coils comprises a first coil 20A, 21A, 22A, 23A, 24A, 25A ... and second coil 20B, 21B, 22B, 23B, 24B, 25B ...
  • the distance separating two coils of a the same pair is preferably identical for each pair of coils, in particular when the magnetic cores of the coils are the same, which is the case described here.
  • the pairs of coils are arranged so that the first coils 20A, 21A, 22A, 23A, 24A, 25A ... are aligned along a first straight line, and the second coils 20B, 21B, 22B, 23B, 24B, 25B ... are aligned along a second straight line.
  • the first line and the second line are parallel.
  • at least one of the first and second straight lines is perpendicular to the strings, which makes it possible to limit the influence of the vibration of a string on a pair of coils other than the one facing it.
  • Each coil see FIG. 3, comprises a magnetic core 30 - for example of soft and cylindrical iron - and a coil 31 - for example copper - around said core.
  • the shape of a coil is generally cylindrical, so that it has an upper face SUP and a lower face INF.
  • the set of pairs of coils therefore has an upper face, intended to be positioned opposite the strings.
  • two coils of the same pair are identical to each other. It can be provided that all the cores are identical to each other or all the coils are identical to each other.
  • the two coils are electrically connected in series and are in magnetic connection with each other.
  • magnetic bond is meant that magnetic LC field lines exist between them ( Figure 2).
  • a pair of coils is not in electrical connection with another pair of coils, thanks to the shieldings described later.
  • the LC field lines that are established between the two cores of the same pair are essentially parallel to the strings, which allows the polyphony since the vibration of a string does not influence any other pair of reels than the one that makes it face.
  • all the cores of the first coils have the same magnetic polarity between them, and all the cores of the second coils have the same magnetic polarity between them, inverted with respect to the magnetic polarity of all the cores of the coils.
  • first coils For example all the upper faces of the first coils have a north pole N and all the upper faces of the second coils have a south pole S (or vice versa), see Figure 4, which makes it possible not to establish lines magnetic two adjacent faces of two adjacent nuclei.
  • one of the coils is equipped with an electric wire intended to be connected to a ground; and the other coil is equipped with another electrical wire for carrying the output signal to an amplifier.
  • each pair of coils is connected to a respective amplifier.
  • a set of at least one inner dipole magnet 40 for example alnico, one pole of which is in magnetic connection with the core of a coil of one pair of coils and the other pole is in magnetic connection with the core of the other coil of said pair.
  • the length of the inner dipole magnet is substantially equal to the distance between two cores of a pair of coils.
  • an internal dipole magnet 40 is provided per pair of coils (FIG. 4), so that for a given pair of coils: the core of the first coil is in magnetic connection with a pole of a dedicated internal dipolar magnet and the core of the second coil is in magnetic connection with the other pole of said inner dipole magnet.
  • a respective internal dipole magnet can be provided for each pair of adjacent pairs of coils.
  • the assembly of at least one internal dipole magnet 40 is positioned on the side of the lower face INF of the coils (FIG. 3).
  • each magnetic shield is electrically insulated from its neighbors, for example by a varnish deposited on the periphery of each shield.
  • Each coil is surrounded by respective individual magnetic shielding 50, preferably of generally tubular shape, for example of soft iron.
  • Each individual shield is distant from the core it surrounds, that is, there is no contact between the core of a given coil and its individual shield.
  • a shield acts as a closed coil, shorting the induction changes from a neighboring coil.
  • the core of a coil is in magnetic connection neither with its respective shielding nor another shielding.
  • no shielding is in contact with an internal magnet 40.
  • one pair of coils is not in magnetic connection with another pair of coils. , especially adjacent, which means that the vibration of a chord is detected by the pair of coils facing it but does not influence or almost not an adjacent pair of coils, which allows the polyphony of the microphone.
  • the shield 50 thus allows the use of the instrument in distortion since it avoids the influence of a rope on the other.
  • the magnetic shields are integral with the support, preferably on the underside of the coils, and have a respective elongation axis XX substantially perpendicular to the support.
  • the elongation axes are parallel to each other.
  • the cores of the coils contained in the shields have an axis of elongation also substantially perpendicular to the support, that is to say intended to be substantially perpendicular to the strings.
  • the pairs of coils are advantageously parallel to each other.
  • the microphone 10 structurally (not magnetically) has a plane of symmetry parallel to the axis of elongation XX and located at a distance from the pairs of coils (see figure).
  • Two adjacent shields are optionally in contact with one another but electrically isolated.
  • each shielding 50A, 51A, 52A, 53A, 54A, 55A ... 50B, 51B, 52B, 53B, 54B, 55B ... has the same magnetic polarity N / S as that of the coil contained therein.
  • each shield 50A, 51A, 52A, 53A, 54A, 55A ... 50B, 51B, 52B, 53B, 54B, 55B ... has a potential vector substantially equal to that it the coil it contains, which avoids generating field lines between the shields and coils.
  • each magnetic shield 50 has a first recess 50_E1 at the upper face SUP.
  • each first recess has a proper elongation axis, preferably parallel to the axis of elongation of the shield, that is to say parallel to the axis of elongation of the coil.
  • a first recess generally has a disc shape.
  • the first recess 50_E1 of one of the coils faces the first recess of the other of the coils, so that for each pair of coils the axes of elongations of the first recesses of the two coils and the rope are located in the same plane, which facilitates the establishment of field lines between the core of the first coil and the core of the second coil, that is to say to increase the density lines of field parallel to the string between these two nuclei.
  • each magnetic shield has a second recess 50_E2 at the upper face, facing the first recess.
  • each second recess has a proper elongation axis, preferably parallel to the axis of elongation of the shield, that is to say parallel to the elongation axis of the coil.
  • a second recess generally has a disc shape.
  • the second recess 50_E2 faces an external dipole magnet 60 for example ceramic or alnico (described below and bearing the reference 60A and 60B with reference to the first and second coils respectively), which facilitates the establishment of field lines, i.e., to increase the density of field lines between the coil core contained in the shield and the outer dipole magnet in magnetic connection with said core.
  • an external dipole magnet 60 for example ceramic or alnico (described below and bearing the reference 60A and 60B with reference to the first and second coils respectively), which facilitates the establishment of field lines, i.e., to increase the density of field lines between the coil core contained in the shield and the outer dipole magnet in magnetic connection with said core.
  • each magnetic shield has a (third) recess 50_E3, at the bottom face.
  • each third recess has a proper elongation axis, preferably parallel to the elongation axis of the shield, that is to say parallel to the axis of elongation of the coil and possibly coinciding with the acxe of elongation of the first recess.
  • all the third recesses are identical.
  • a third recess generally has a disc shape.
  • the recess 50A_E3 at the lower face of one of the coils faces the recess 50B_E3 at the lower face of the other of the coils (Fig. 2), which allows the penetration of one end of the inner dipole magnet 40 within the volume that said shield would have without said recess 50_E3.
  • This recess 50_E3 at the lower face protects the inner magnet and limit the overall height of the microphone.
  • each external dipole magnet has a magnetic polarity axis.
  • each core has an N / S polarity along an axis of magnetic polarity and each external dipole magnet 60A, 60B, has an inverted polarity S / N along an axis of magnetic polarity preferably substantially parallel.
  • first external dipolar magnet 60A common to all the first coils (or their core), and a second external dipolar magnet 60B common to all of the second coils (or their core), see figure 4.
  • first 60A and second 60B external dipole magnets are identical parallelepiped magnets, for example alnico or ferrite, whose length is at least equal to the distance separating the extreme cores of a set of first coils, which makes it possible to obtain a magnetic connection for all the first / second coils.
  • the height and width of the parallelepiped magnets depend on the nature of the magnets (the intensity of the magnetic field) and the desired sound effect. It is also possible to provide an external dipole magnet per core
  • each axis of magnetic polarity is parallel to the axis of polarity of the coil with which it is in magnetic connection.
  • each external dipole magnet is inverted with respect to the polarity of the coil with which it is in magnetic connection.
  • each external dipole magnet is disposed closer to the upper face SUP than the lower face INF, which facilitates the establishment of field lines on the side of the strings 13 of the instrument.
  • the presence of such external dipole magnets makes it possible in particular to reinforce the medium and low frequencies of the instrument and to conserve harmonics.
  • the internal dipole magnet 40 it is possible to provide an assembly of at least one shunt 41 (a shunt 41 per internal dipole magnet 40), disposed between the set of at least one inner dipole magnet and the cores of at least one pair of coils, for attenuating the magnetic field strength of said inner dipole magnet 40 at said cores.
  • a shunt can be implemented.
  • the shunt can be optional.
  • the external dipole magnet it is possible to provide an assembly of at least one magnetic and electrical insulator 42A, 42B ... disposed between said set of at least one external dipole magnet 60 and a set of shields of first / second coils respectively.
  • a respective magnetic and electrical insulator 42A, 42B by external dipole magnet 60A, 60B.
  • This magnetic and electrical insulator makes it possible to reduce the intensity of the magnetic field of the external dipole magnet 60A, 60B at the level of the first coil 20A, 21A, 22A, 23A, 24A, 25A and the second coil 20B, 21B, 22B, 23B, 24B, 25B respectively by moving the outer dipole magnet 60A, 60B away from said coils.
  • a magnetic and electrical insulator 42A, 42B may be common to a set of coils / shields, as shown in FIG.
  • an external dipole magnet is common to a set of first / second coils and secured to said assembly by means of a magnetic insulator itself integral with all of the magnetic shields of said first / second coils.
  • the magnetic insulator 42A, 42B is for example bakelite.
  • the thickness of the latter is chosen according to the desired sound effect, and the dimensions and nature of the external magnet.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

The invention relates to a passive polyphonic double-coil microphone (10) for a string musical instrument (13), including: a substrate (11); and a set of pairs of coils, wherein, for each pair of coils, the two coils are electrically mounted in series and magnetically coupled (LC) together. The microphone according to the invention is essentially characterized in that it further includes: a unit consisting of at least one internal dipole magnet (40), the poles of which are magnetically coupled to the respective core of a coil from a pair of coils; a set of magnetic shields that are rigidly connected to the substrate (11), wherein each coil is surrounded by a respective magnetic shield, and wherein, for each pair of coils, one of the coils is connected to the ground, and the other is provided to carry an output signal to an amplifier.

Description

MICROPHONE POLYPHONIQUE PASSIF A DOUBLE BOBINAGE POUR  DOUBLE WINDING PASSIVE POLYPHONIC MICROPHONE FOR
INSTRUMENT DE MUSIQUE A CORDES.  INSTRUMENT OF MUSIC WITH STRINGS.
La présente invention concerne le domaine de l'amplification d'un instrument à cordes. The present invention relates to the field of amplification of a stringed instrument.
Les microphones pour instrument à cordes, ci-après « micro (s) », sont bien connus, ils sont classiquement intégrés au corps de l'instrument de musique et il existe de nombreux documents de l'état de la technique sur ce sujet. The microphones for stringed instruments, hereinafter "micro (s)", are well known, they are classically integrated into the body of the musical instrument and there are many documents of the prior art on this subject.
A la différence des micros piézoélectriques dont le signal de sortie dépend de la tension mécanique de la corde, les micros magnétiques classiques comprennent des bobines (solénoïdes) dont le signal de sortie dépend du déplacement de la corde. Un solénoïde produit un champ magnétique dans son voisinage quand il est parcouru par un courant. Selon ce principe, mais à l'inverse, un microphone génère un courant de sortie en réponse à la perturbation du champ magnétique de ses bobines. La perturbation du champ magnétique est en fait due à la vibration de la corde (ou des cordes) jouée (s) par le musicien. Lorsqu'une corde métallique vibre à proximité du micro, la variation du champ magnétique crée un courant induit, de même fréquence que la corde en vibration, qu'il suffit alors d'amplifier. II en existe de deux types de micros : à simple ou à double bobinage . Unlike piezoelectric pickups whose output signal depends on the mechanical tension of the string, conventional magnetic pickups include coils (solenoids) whose output signal depends on the movement of the string. A solenoid produces a magnetic field in its vicinity when it is traversed by a current. According to this principle, but conversely, a microphone generates an output current in response to the disturbance of the magnetic field of its coils. The disturbance of the magnetic field is in fact due to the vibration of the string (or strings) played by the musician. When a metallic rope vibrates near the microphone, the variation of the magnetic field creates an induced current, of the same frequency as the vibrating cord, which then needs to be amplified. There are two types of microphones: single or double coil.
Un micro magnétique à simple bobinage est composé d'un aimant, d'une bobine traversée par le champ magnétique de l'aimant et d'un diaphragme mobile. Les variations du diaphragme mobile modifient le champ magnétique induit par l'aimant qui génère une force contre-électromotrice dans les bobines. Dans le cas d'un instrument de musique à cordes, le diaphragme mobile est constitué par les cordes. Un micro magnétique à double bobinage fonctionne sur le même principe que le micro à simple bobinage mais avec deux bobines reliées électriquement entre elles. Un exemple de ces microphones dits humbuckers est illustré en figure 1. Dans ces micros, deux bobines sont fusionnées c'est-à-dire montées en série (au niveau électrique) et avec une polarité magnétique inversée, afin d'annuler les perturbations électromagnétiques extérieures. Ces micros se caractérisent par un son riche en graves et médiums et par un niveau de sortie généralement plus élevé que sur des micros à simple bobinage. A single-coil magnetic microphone is composed of a magnet, a coil traversed by the magnetic field of the magnet and a movable diaphragm. Variations in the moving diaphragm modify the magnetic field induced by the magnet which generates a counter-electromotive force in the coils. In the case of a stringed musical instrument, the movable diaphragm is constituted by the strings. A double-coil magnetic pickup works on the same principle as a single-coil pickup but with two coils electrically connected to each other. An example of these so-called humbuckers microphones is illustrated in Figure 1. In these microphones, two coils are fused that is to say, mounted in series (at the electrical level) and with a reversed magnetic polarity, to cancel the electromagnetic disturbances exterior. These microphones are characterized by a rich sound in bass and midrange and a level of output generally higher than on single coil pickups.
Toutefois, en particulier dans le cadre d'un instrument joué avec un effet de distorsion, les notes jouées acquièrent alors un son diffus (le grain ou « crunch ») qui les rend moins claquantes. Plus on augmente la distorsion et plus le son naturel de l'instrument (notamment une guitare électrique) est substitué au profit du crunch et du « sustain » (capacité qu'a l'instrument de conserver, maintenir le son d'une note, sans que celle-ci soit rejouée) qui augmentent. Cet effet, obtenu par saturation d'un amplificateur classique où à l'aide d'un module (ou pédale) d'effet ad hoc, procède par écrêtage, comprime l'attaque de la note jouée tout en augmentant ses harmoniques. En pratique, le signal issu d'une seule corde est parfaitement distinct. Au-delà, pour un accord à deux cordes, le signal est encore audible mais pour des accords à trois cordes ou plus, le signal de sortie est alors un bruit inutilisable. However, especially as part of an instrument played with a distortion effect, the notes played acquire a diffuse sound (the grain or "crunch") that makes them less slamming. The more we increase the distortion and the natural sound of the instrument (especially an electric guitar) is substituted for the benefit of the crunch and "sustain" (ability of the instrument to preserve, maintain the sound of a note, without it being replayed) which increases. This effect, obtained by saturation of a conventional amplifier or using an ad hoc effect module (or pedal), proceeds by clipping, compresses the attack of the note played while increasing its harmonics. In practice, the signal from a single string is perfectly distinct. Beyond this, for a two-string chord, the signal is still audible but for chords with three or more strings, the output signal is then an unusable noise.
Ainsi les micros classiques à simple ou double bobinage ne sont pas applicables aux sonorités polyphoniques dans lesquelles les sons de chaque corde doivent être aussi séparés que possible. Thus conventional microphones single or double coil are not applicable to polyphonic sounds in which the sounds of each string should be as separated as possible.
Dans cet esprit, la Demanderesse a déposé la demande de brevet FR9607937. La présente invention a pour but d'améliorer la solution proposée dans la demande FR9607937 en proposant une solution analogique audible permettant une polyphonie pour tout type d'instrument à cordes, y compris en distorsion. In this spirit, the Applicant has filed the patent application FR9607937. The present invention aims to improve the solution proposed in application FR9607937 by proposing a an audible analog solution that allows polyphony for any type of stringed instrument, including distortion.
Avec cet objectif en vue, selon un premier de ses objets, l'invention concerne un microphone polyphonique passif à double bobinage pour instrument de musique à cordes comprenant : With this objective in view, according to a first of its objects, the invention relates to a passive polyphonic double-coil microphone for a stringed musical instrument comprising:
- un support,  - a support,
- un ensemble de paires de bobines chaque paire de bobines comprenant une première bobine et une deuxième bobine, chaque bobine comprenant un noyau magnétique et un bobinage autour dudit noyau, une face supérieure et une face inférieure,  a set of pairs of coils each pair of coils comprising a first coil and a second coil, each coil comprising a magnetic core and a coil around said core, an upper face and a lower face,
- dans lequel pour chaque paire de bobines, les deux bobines sont montées électriquement en série et en liaison magnétique l'une avec l'autre.  - In which for each pair of coils, the two coils are electrically connected in series and in magnetic connection with each other.
Selon l'invention, le micro est essentiellement caractérisé en ce qu' il comprend en outre  According to the invention, the microphone is essentially characterized in that it further comprises
- un ensemble d'au moins un aimant dipolaire interne, dont un pôle est en liaison magnétique avec le noyau d'une bobine d'une paire de bobines et l'autre pôle est en liaison magnétique avec le noyau de l'autre bobine de ladite paire, an assembly of at least one internal dipole magnet, one pole of which is in magnetic connection with the core of a coil of one pair of coils and the other pole is in magnetic connection with the core of the other coil of said pair,
- un ensemble de blindages magnétiques, solidaires du support, a set of magnetic shields, integral with the support,
- chaque bobine étant entourée d'un blindage magnétique respectif,  each coil being surrounded by a respective magnetic shielding,
et and
- pour chaque paire de bobines, l'une des bobines est équipée d'un fil électrique pour être reliée à une masse, et l'autre bobine est équipée d'un autre fil électrique pour le transport d'un signal de sortie vers un amplificateur.  for each pair of coils, one of the coils is equipped with an electric wire to be connected to a ground, and the other coil is equipped with another electrical wire for transporting an output signal to a amplifier.
De préférence, la distance séparant deux bobines d'une même paire est identique pour chaque paire de bobines. De préférence, chaque blindage présente une même polarité magnétique que celle de la bobine qu'il contient. De préférence, les paires de bobines sont disposées de sorte que l'ensemble des premières bobines sont alignées selon une première droite, et l'ensemble des deuxièmes bobines sont alignées selon une deuxième droite. Preferably, the distance separating two coils of the same pair is identical for each pair of coils. Preferably, each shield has the same magnetic polarity as that of the coil it contains. Preferably, the pairs of coils are arranged so that the set of first coils are aligned along a first straight line, and all the second coils are aligned along a second straight line.
On peut prévoir que l'ensemble d'au moins un aimant dipolaire interne comprend : It can be provided that the assembly of at least one internal dipolar magnet comprises:
un aimant dipolaire interne respectif par paire de bobines,  a respective inner dipole magnet per pair of coils,
- un aimant dipolaire interne pour l'ensemble des paires de bobines, ou  an internal dipolar magnet for all the pairs of coils, or
- un aimant dipolaire interne respectif par couple de paires adjacentes de bobines.  a respective internal dipole magnet for each pair of adjacent pairs of coils.
De préférence, l'ensemble des paires de bobines présente une face supérieure, destinée à être positionnée en regard des cordes, et une face inférieure ; ledit ensemble d'au moins un aimant dipolaire interne étant positionné du côté de la face inférieure. Preferably, the set of pairs of coils has an upper face, intended to be positioned opposite the strings, and a lower face; said set of at least one inner dipole magnet being positioned on the side of the lower face.
On peut prévoir en outre un ensemble d'au moins un shunt magnétique, disposé entre l'ensemble d'au moins un aimant dipolaire interne et les noyaux d'au moins une paire de bobines, pour atténuer l'intensité du champ magnétique dudit aimant dipolaire interne au niveau desdits noyaux. Alternativement, on peut ne pas mettre en œuvre de shunt magnétique, pourvu que la puissance de l'aimant interne, par exemple alnico, soit appropriée . It is also possible to provide an assembly of at least one magnetic shunt disposed between the assembly of at least one internal dipole magnet and the cores of at least one pair of coils, to attenuate the intensity of the magnetic field of said magnet internal dipole at said nuclei. Alternatively, one can not implement magnetic shunt, provided that the power of the internal magnet, for example alnico, is appropriate.
On peut prévoir en outre un ensemble d'au moins un aimant dipolaire externe, en liaison magnétique avec au moins un noyau et présentant une polarité magnétique inverse dudit noyau. On peut prévoir que ledit ensemble d'au moins un aimant dipolaire externe est solidaire d'au moins un blindage magnétique par l'intermédiaire d'un isolant électrique et magnétique . In addition, a set of at least one external dipole magnet can be provided, in magnetic connection with at least one core and having a reverse magnetic polarity of said core. It can be provided that said set of at least one external dipole magnet is integral with at least one shielding magnetic through an electrical and magnetic insulator.
Dans un mode de réalisation, le micro comprend un premier aimant dipolaire externe commun à l'ensemble des premières bobines, et un deuxième aimant dipolaire externe commun à l'ensemble des deuxièmes bobines. In one embodiment, the microphone comprises a first external dipolar magnet common to all the first coils, and a second external dipolar magnet common to all of the second coils.
Dans un mode de réalisation, chaque blindage magnétique présente un premier évidement au niveau de la face supérieure, pour faciliter l'établissement de lignes de champ entre le noyau de la première bobine et le noyau de la deuxième bobine d'une paire de bobines donnée. In one embodiment, each magnetic shield has a first recess at the top face to facilitate the establishment of field lines between the core of the first coil and the core of the second coil of a given coil pair. .
On peut prévoir que chaque blindage magnétique présente un deuxième évidement au niveau de la face supérieure, pour faciliter l'établissement de lignes de champ entre le noyau de la bobine contenu dans le blindage et l'aimant dipolaire externe en liaison magnétique avec ledit noyau. It can be provided that each magnetic shield has a second recess at the upper face, to facilitate the establishment of field lines between the core of the coil contained in the shield and the outer dipole magnet in magnetic connection with said core.
On peut prévoir que chaque blindage magnétique présente un évidement au niveau de la face inférieure, de sorte à permettre la pénétration d'une extrémité de l'aimant dipolaire interne à l'intérieur du volume qu'aurait ledit blindage sans ledit évidement . It can be provided that each magnetic shield has a recess at the lower face, so as to allow the penetration of an end of the inner dipole magnet within the volume that said shield without said recess.
On peut prévoir que l'ensemble des noyaux des premières bobines présente une même polarité magnétique entre eux, et l'ensemble des noyaux des deuxièmes bobines présente une même polarité magnétique entre eux, inversée par rapport à la polarité magnétique de l'ensemble des noyaux des premières bobines . It can be provided that all the cores of the first coils have the same magnetic polarity between them, and all the cores of the second coils have the same magnetic polarity between them, inverted with respect to the magnetic polarity of all the cores first coils.
Selon un autre de ses objets, l'invention concerne un instrument de musique à cordes équipé d'un micro selon 1' invention. Enfin, l'invention concerne également un système pour l'amplification d'un instrument de musique à cordes, le système comprenant un instrument de musique à cordes équipé d'un micro selon l'invention, et un dispositif d'amplificateur électrique connectable électriquement à la sortie dudit microphone. According to another of its objects, the invention relates to a stringed musical instrument equipped with a microphone according to the invention. Finally, the invention also relates to a system for amplifying a stringed musical instrument, the system comprising a stringed musical instrument equipped with a microphone according to the invention, and an electrically connectable electrical amplifier device. at the output of said microphone.
D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description suivante donnée à titre d'exemple illustratif et non limitatif et faite en référence aux figures annexées dans lesquelles : Other characteristics and advantages of the present invention will emerge more clearly on reading the following description given by way of illustrative and nonlimiting example and with reference to the appended figures in which:
la figure 1 illustre un mode de réalisation d'un microphone humbuckers selon l'art antérieur,  FIG. 1 illustrates an embodiment of a humbucker microphone according to the prior art,
- la figure 2 illustre une vue partielle de trois- quarts d'un mode de réalisation du micro selon l'invention,  FIG. 2 illustrates a partial three-quarter view of an embodiment of the microphone according to the invention,
la figure 3 illustre une coupe transversale au niveau des noyaux d'une paire de bobine d'un mode de réalisation du micro selon l'invention,  FIG. 3 illustrates a cross-section at the level of the cores of a coil pair of an embodiment of the microphone according to the invention,
- la figure 4 illustre en vue de dessus un mode de réalisation du micro selon l'invention, et  FIG. 4 is a top view of an embodiment of the microphone according to the invention, and
la figure 5 illustre une coupe transversale d'un blindage selon l'invention. Pour plus de concision, il est fait référence ici à un instrument de musique de type guitare électrique à six cordes. Bien entendu, le microphone peut être adapté à des guitares acoustiques, des guitares basses, ou d'autres instruments à corde. Quel que soit le nombre de cordes de l'instrument, il suffit d'adapter le nombre de paires de bobines au nombre de cordes .  Figure 5 illustrates a cross section of a shield according to the invention. For brevity, reference is made here to a musical instrument of the six-string electric guitar type. Of course, the microphone can be adapted to acoustic guitars, bass guitars, or other string instruments. Whatever the number of strings of the instrument, it is enough to adapt the number of pairs of coils to the number of strings.
Le microphone 10 polyphonique passif à double bobinage pour instrument de musique à cordes comprend un support. Le support 11 est sensiblement plan, c'est-à-dire qu'il peut présenter une légère courbure, typiquement la courbure de l' instrument et par exemple celle du manche de guitare, de sorte à pouvoir être intégré plus facilement dans l'instrument. The passive polyphonic double-coil microphone for a stringed musical instrument comprises a support. The support 11 is substantially flat, that is to say it may have a slight curvature, typically the curvature of the instrument and for example that of the guitar neck, so that it can be integrated more easily into the instrument.
De préférence, le support 11 présente un évidement central 12, dans le plan du support 11, pour faciliter la mise en place de l'aimant interne (voir ci-après). Paires de bobines Preferably, the support 11 has a central recess 12, in the plane of the support 11, to facilitate the establishment of the inner magnet (see below). Pairs of coils
Le micro 10 comprend un ensemble de paires de bobines 20, 21, 22, 23, 24, 25 etc. dont le nombre de paires est égal au nombre de cordes. Chaque paire de bobines est destinée à être positionnée en regard d'une corde 13 respective, de sorte que chaque paire de bobine fait face à une corde respective. Les noyaux magnétiques d'une même paire de bobines sont positionnés pour capter les vibrations d'une seule et même corde.  The microphone 10 comprises a set of pairs of coils 20, 21, 22, 23, 24, 25 etc. whose number of pairs is equal to the number of strings. Each pair of coils is intended to be positioned facing a respective rope 13, so that each pair of coils faces a respective rope. The magnetic cores of the same pair of coils are positioned to capture the vibrations of one and the same string.
Chaque paire de bobines comprend une première bobine 20A, 21A, 22A, 23A, 24A, 25A... et deuxième bobine 2ÛB, 21B, 22B, 23B, 24B, 25B... De préférence, la distance séparant deux bobines d'une même paire est de préférence identique pour chaque paire de bobines en particulier lorsque les noyaux magnétiques des bobines sont les mêmes, ce qui est le cas exposé ici. Each pair of coils comprises a first coil 20A, 21A, 22A, 23A, 24A, 25A ... and second coil 20B, 21B, 22B, 23B, 24B, 25B ... Preferably, the distance separating two coils of a the same pair is preferably identical for each pair of coils, in particular when the magnetic cores of the coils are the same, which is the case described here.
De préférence, les paires de bobines sont disposées de sorte que les premières bobines 20A, 21A, 22A, 23A, 24A, 25A... sont alignées selon une première droite, et les deuxièmes bobines 20B, 21B, 22B, 23B, 24B, 25B... sont alignées selon une deuxième droite. De préférence, la première droite et la deuxième droite sont parallèles. De préférence au moins l'une des première et deuxième droite est perpendiculaire aux cordes, ce qui permet de limiter l'influence de la vibration d'une corde sur une paire de bobines autre que celle lui faisant face. Chaque bobine, voir figure 3, comprend un noyau magnétique 30 -par exemple en fer doux et cylindrique- et un bobinage 31 - par exemple en cuivre- autour dudit noyau. La forme d'une bobine est globalement cylindrique, de sorte qu'elle présente une face supérieure SUP et une face inférieure INF. L'ensemble des paires de bobines présente donc une face supérieure, destinée à être positionnée en regard des cordes. En termes de magnétisme, on assimile ici une bobine et son noyau. De préférence, deux bobines d'une même paire sont identiques entre elles. On peut prévoir que tous les noyaux sont identiques entre eux ou toutes les bobines sont identiques entre elles . Preferably, the pairs of coils are arranged so that the first coils 20A, 21A, 22A, 23A, 24A, 25A ... are aligned along a first straight line, and the second coils 20B, 21B, 22B, 23B, 24B, 25B ... are aligned along a second straight line. Preferably, the first line and the second line are parallel. Preferably at least one of the first and second straight lines is perpendicular to the strings, which makes it possible to limit the influence of the vibration of a string on a pair of coils other than the one facing it. Each coil, see FIG. 3, comprises a magnetic core 30 - for example of soft and cylindrical iron - and a coil 31 - for example copper - around said core. The shape of a coil is generally cylindrical, so that it has an upper face SUP and a lower face INF. The set of pairs of coils therefore has an upper face, intended to be positioned opposite the strings. In terms of magnetism, we here assimilate a coil and its core. Preferably, two coils of the same pair are identical to each other. It can be provided that all the cores are identical to each other or all the coils are identical to each other.
Pour chaque paire de bobines, les deux bobines sont montées électriquement en série et sont en liaison magnétique l'une avec l'autre. Par « en liaison magnétique », on entend qu'il existe des lignes de champ LC magnétiques entre elles (figure 2) . Toutefois, une paire de bobines n'est pas en liaison électrique avec une autre paire de bobines, grâce aux blindages décrits ultérieurement. Les lignes de champ LC qui s'établissent entre les deux noyaux d'une même paire sont essentiellement parallèles aux cordes, ce qui permet la polyphonie puisque la vibration d'une corde n'influence pas d'autre paire de bobine que celle lui faisant face. For each pair of coils, the two coils are electrically connected in series and are in magnetic connection with each other. By "magnetic bond" is meant that magnetic LC field lines exist between them (Figure 2). However, a pair of coils is not in electrical connection with another pair of coils, thanks to the shieldings described later. The LC field lines that are established between the two cores of the same pair are essentially parallel to the strings, which allows the polyphony since the vibration of a string does not influence any other pair of reels than the one that makes it face.
De préférence, l'ensemble des noyaux des premières bobines présente une même polarité magnétique entre eux, et l'ensemble des noyaux des deuxièmes bobines présente une même polarité magnétique entre eux, inversée par rapport à la polarité magnétique de l'ensemble des noyaux des premières bobines. Par exemple toutes les faces supérieures des premières bobines présentent un pôle nord N et toutes les faces supérieures des deuxièmes bobines présentent un pôle Sud S (ou inversement) , voir figure 4, ce qui permet de ne pas établir de lignes magnétiques deux faces adjacentes de deux noyaux adjacents . Preferably, all the cores of the first coils have the same magnetic polarity between them, and all the cores of the second coils have the same magnetic polarity between them, inverted with respect to the magnetic polarity of all the cores of the coils. first coils. For example all the upper faces of the first coils have a north pole N and all the upper faces of the second coils have a south pole S (or vice versa), see Figure 4, which makes it possible not to establish lines magnetic two adjacent faces of two adjacent nuclei.
Pour le transport du signal électrique généré par la vibration d'une corde, on prévoit que pour chaque paire de bobines, l'une des bobines est équipée d'un fil électrique destiné à être relié à une masse ; et l'autre bobine est équipée d'un autre fil électrique pour le transport du signal de sortie vers un amplificateur. For the transport of the electrical signal generated by the vibration of a rope, it is expected that for each pair of coils, one of the coils is equipped with an electric wire intended to be connected to a ground; and the other coil is equipped with another electrical wire for carrying the output signal to an amplifier.
On peut donc prévoir que chaque paire de bobines soit reliée à un amplificateur respectif. It can therefore be expected that each pair of coils is connected to a respective amplifier.
Aimant dipolaire interne Internal dipole magnet
On prévoit également un ensemble d'au moins un aimant dipolaire interne 40, par exemple en alnico, dont un pôle est en liaison magnétique avec le noyau d'une bobine d'une paire de bobines et l'autre pôle est en liaison magnétique avec le noyau de l'autre bobine de ladite paire.  There is also provided a set of at least one inner dipole magnet 40, for example alnico, one pole of which is in magnetic connection with the core of a coil of one pair of coils and the other pole is in magnetic connection with the core of the other coil of said pair.
De préférence, la longueur de l'aimant dipolaire interne est sensiblement égale à la distance entre deux noyaux d'une paire de bobines. De préférence, on ne prévoit pas d'aimant dipolaire interne commun à l'ensemble des paires de bobines (non représenté) . En effet, cette solution augmente la diaphonie car l'aimant commun permet d'établir des lignes de champ entre paires de bobines. De préférence, on prévoit un aimant dipolaire interne 40 respectif par paire de bobines (figure 4), de sorte que pour une paire de bobines donnée : le noyau de la première bobine est en liaison magnétique avec un pôle d'un aimant dipolaire interne dédié, et le noyau de la deuxième bobine est en liaison magnétique avec l'autre pôle dudit aimant dipolaire interne. On peut également prévoir une solution intermédiaire consistant à coupler les cordes par fréquence, par exemple pour une guitare à six cordes : les deux cordes basses ensemble, les deux cordes médium ensemble et les deux cordes aiguës ensemble. A cet effet, on peut prévoir un aimant dipolaire interne respectif par couple de paires adjacentes de bobines. Preferably, the length of the inner dipole magnet is substantially equal to the distance between two cores of a pair of coils. Preferably, there is no internal dipolar magnet common to all pairs of coils (not shown). Indeed, this solution increases the crosstalk because the common magnet makes it possible to establish lines of field between pairs of coils. Preferably, an internal dipole magnet 40 is provided per pair of coils (FIG. 4), so that for a given pair of coils: the core of the first coil is in magnetic connection with a pole of a dedicated internal dipolar magnet and the core of the second coil is in magnetic connection with the other pole of said inner dipole magnet. One can also provide an intermediate solution of coupling the strings by frequency, for example for a six-string guitar: the two bass strings together, the two middle strings together and the two strings acute together. For this purpose, a respective internal dipole magnet can be provided for each pair of adjacent pairs of coils.
On peut également prévoir une solution intermédiaire en vue d'une sortie stéréophonique par couplage électrique des cordes une sur deux, par exemple pour une guitare les cordes 1 3 5 et 2 4 6. It is also possible to provide an intermediate solution for stereophonic output by electrical coupling of the strings one in two, for example for a guitar strings 1 3 5 and 2 4 6.
De préférence, l'ensemble d'au moins un aimant dipolaire interne 40 est positionné du côté de la face inférieure INF des bobines (figure 3) . Preferably, the assembly of at least one internal dipole magnet 40 is positioned on the side of the lower face INF of the coils (FIG. 3).
Pour permettre une polyphonie y compris en distorsion, on prévoit un ensemble de blindages magnétiques, de préférence identiques entre eux, et par exemple en fer doux. Avantageusement, chaque blindage magnétique est isolé électriquement de ses voisins, par exemple par un vernis déposé sur la périphérie de chaque blindage. To allow a polyphony including distortion, there is provided a set of magnetic shielding, preferably identical to each other, and for example soft iron. Advantageously, each magnetic shield is electrically insulated from its neighbors, for example by a varnish deposited on the periphery of each shield.
Blindage magnétique Magnetic shielding
Chaque bobine est entourée blindage magnétique 50 individuel respectif, de forme préférence globalement tubulaire, par exemple en fer doux.  Each coil is surrounded by respective individual magnetic shielding 50, preferably of generally tubular shape, for example of soft iron.
Chaque blindage individuel est distant du noyau qu'il entoure, c'est-à-dire qu'il n'y a pas de contact entre le noyau d'une bobine donnée et son blindage individuel. Un blindage se comporte comme une spire fermée mettant en court-circuit les variations d'induction provenant d'une bobine voisine. Ainsi, le noyau d'une bobine n'est en liaison magnétique ni avec son blindage respectif ni un autre blindage. De préférence, aucun blindage n'est au contact d'un aimant interne 40. Each individual shield is distant from the core it surrounds, that is, there is no contact between the core of a given coil and its individual shield. A shield acts as a closed coil, shorting the induction changes from a neighboring coil. Thus, the core of a coil is in magnetic connection neither with its respective shielding nor another shielding. Preferably, no shielding is in contact with an internal magnet 40.
Grâce aux blindages magnétiques 50A, 51A, 52A, 53A, 54A, 55A... 50B, 51B, 52B, 53B, 54B, 55B..., une paire de bobines n'est pas en liaison magnétique avec une autre paire de bobines, en particulier adjacente, ce qui signifie que la vibration d'une corde est détectée par la paire de bobines lui faisant face mais n'influence pas ou quasiment pas une paire de bobines adjacente, ce qui permet la polyphonie du micro. Le blindage 50 permet donc l'utilisation de l'instrument en distorsion puisqu'il évite l'influence d'une corde sur l'autre. Thanks to the magnetic shields 50A, 51A, 52A, 53A, 54A, 55A ... 50B, 51B, 52B, 53B, 54B, 55B ..., one pair of coils is not in magnetic connection with another pair of coils. , especially adjacent, which means that the vibration of a chord is detected by the pair of coils facing it but does not influence or almost not an adjacent pair of coils, which allows the polyphony of the microphone. The shield 50 thus allows the use of the instrument in distortion since it avoids the influence of a rope on the other.
Les blindages magnétiques sont solidaires du support, de préférence du côté de la face inférieure des bobines, et présentent un axe d'élongation XX respectif sensiblement perpendiculaire au support. De préférence, les axes d'élongation sont parallèles entre eux. Ainsi, les noyaux des bobines contenues dans les blindages présentent un axe d'élongation également sensiblement perpendiculaire au support, c'est-à-dire destiné à être sensiblement perpendiculaire aux cordes. Les paires de bobines sont avantageusement parallèles entre elles. The magnetic shields are integral with the support, preferably on the underside of the coils, and have a respective elongation axis XX substantially perpendicular to the support. Preferably, the elongation axes are parallel to each other. Thus, the cores of the coils contained in the shields have an axis of elongation also substantially perpendicular to the support, that is to say intended to be substantially perpendicular to the strings. The pairs of coils are advantageously parallel to each other.
De préférence, le micro 10 présente structurellement (pas magnétiquement) un plan de symétrie parallèle à l'axe d' élongation XX et situé à mi distance des paires de bobines (voir figure ) . Preferably, the microphone 10 structurally (not magnetically) has a plane of symmetry parallel to the axis of elongation XX and located at a distance from the pairs of coils (see figure).
Deux blindages adjacents sont éventuellement au contact l'un de l'autre mais isolés électriquement. Two adjacent shields are optionally in contact with one another but electrically isolated.
De préférence, chaque blindage 5ÛA, 51A, 52A, 53A, 54A, 55A... 50B, 51B, 52B, 53B, 54B, 55B... présente une même polarité magnétique N / S que celle de la bobine qu'il contient. Avantageusement, chaque blindage 50A, 51A, 52A, 53A, 54A, 55A... 50B, 51B, 52B, 53B, 54B, 55B... présente un potentiel vecteur sensiblement égal à celui ce la bobine qu'il contient, ce qui permet d' éviter de générer des lignes de champ entre le blindages et bobines. Au niveau structurel, on peut prévoir que chaque blindage magnétique 50 présente un premier évidement 50_E1 au niveau de la face supérieure SUP. Par exemple chaque premier évidement présente un axe d'élongation propre, de préférence parallèle à l'axe d'élongation du blindage, c'est-à-dire parallèle à l'axe d'élongation de la bobine. De préférence tous les premiers évidements sont identiques. Par exemple un premier évidement présente globalement une forme de disque. Preferably, each shielding 50A, 51A, 52A, 53A, 54A, 55A ... 50B, 51B, 52B, 53B, 54B, 55B ... has the same magnetic polarity N / S as that of the coil contained therein. . Advantageously, each shield 50A, 51A, 52A, 53A, 54A, 55A ... 50B, 51B, 52B, 53B, 54B, 55B ... has a potential vector substantially equal to that it the coil it contains, which avoids generating field lines between the shields and coils. At the structural level, it can be provided that each magnetic shield 50 has a first recess 50_E1 at the upper face SUP. For example, each first recess has a proper elongation axis, preferably parallel to the axis of elongation of the shield, that is to say parallel to the axis of elongation of the coil. Preferably all the first recesses are identical. For example, a first recess generally has a disc shape.
De préférence, pour une paire de bobines donnée, le premier évidement 50_E1 de l'une des bobines fait face au premier évidement de l'autre des bobines, de sorte que pour chaque paire de bobines les axes d ' élongations des premiers évidements des deux bobines et la corde sont situés dans un même plan, ce qui permet de faciliter l'établissement de lignes de champ entre le noyau de la première bobine et le noyau de la deuxième bobine, c'est-à-dire d'augmenter la densité de lignes de champ parallèles à la corde entre ces deux noyaux. Preferably, for a given pair of coils, the first recess 50_E1 of one of the coils faces the first recess of the other of the coils, so that for each pair of coils the axes of elongations of the first recesses of the two coils and the rope are located in the same plane, which facilitates the establishment of field lines between the core of the first coil and the core of the second coil, that is to say to increase the density lines of field parallel to the string between these two nuclei.
On peut également prévoir que chaque blindage magnétique présente un deuxième évidement 50_E2 au niveau de la face supérieure, faisant face au premier évidement. It can also be provided that each magnetic shield has a second recess 50_E2 at the upper face, facing the first recess.
Par exemple chaque deuxième évidement présente un axe d'élongation propre, de préférence parallèle à l'axe d'élongation du blindage, c'est-à-dire parallèle à l'axe d'élongation de la bobine. De préférence tous les deuxièmes évidements sont identiques. Par exemple un deuxième évidement présente globalement une forme de disque.  For example, each second recess has a proper elongation axis, preferably parallel to the axis of elongation of the shield, that is to say parallel to the elongation axis of the coil. Preferably all the second recesses are identical. For example, a second recess generally has a disc shape.
Le deuxième évidement 50_E2 fait face à un aimant dipolaire externe 60 par exemple céramique ou alnico (décrit ci-après et portant la référence 60A et 60B en référence aux premières et deuxièmes bobines respectivement) , ce qui permet de faciliter l'établissement de lignes de champ, c'est-à-dire d'augmenter la densité de lignes de champ entre le noyau de la bobine contenu dans le blindage et l'aimant dipolaire externe en liaison magnétique avec ledit noyau. The second recess 50_E2 faces an external dipole magnet 60 for example ceramic or alnico (described below and bearing the reference 60A and 60B with reference to the first and second coils respectively), which facilitates the establishment of field lines, i.e., to increase the density of field lines between the coil core contained in the shield and the outer dipole magnet in magnetic connection with said core.
On peut également prévoir que chaque blindage magnétique présente un (troisième) évidement 50_E3, au niveau de la face inférieure. Par exemple chaque troisième évidement présente un axe d'élongation propre, de préférence parallèle à l'axe d'élongation du blindage, c'est-à-dire parallèle à l'axe d'élongation de la bobine et éventuellement confondu avec l'acxe d'élongation du premier évidement. De préférence tous les troisièmes évidements sont identiques. Par exemple un troisième évidement présente globalement une forme de disque. It can also be provided that each magnetic shield has a (third) recess 50_E3, at the bottom face. For example, each third recess has a proper elongation axis, preferably parallel to the elongation axis of the shield, that is to say parallel to the axis of elongation of the coil and possibly coinciding with the acxe of elongation of the first recess. Preferably all the third recesses are identical. For example, a third recess generally has a disc shape.
De préférence, pour une paire de bobines donnée,l'évidement 50A_E3 au niveau de la face inférieure de l'une des bobines fait face à l'évidement 50B_E3 au niveau de la face inférieure de l'autre des bobines (figure 2), ce qui permet la pénétration d'une extrémité de l'aimant dipolaire interne 40 à l'intérieur du volume qu'aurait ledit blindage sans ledit évidement 50_E3. Cet évidement 50_E3 au niveau de la face inférieure permet de protéger l'aimant interne et de limiter la hauteur globale du micro . Preferably, for a given pair of coils, the recess 50A_E3 at the lower face of one of the coils faces the recess 50B_E3 at the lower face of the other of the coils (Fig. 2), which allows the penetration of one end of the inner dipole magnet 40 within the volume that said shield would have without said recess 50_E3. This recess 50_E3 at the lower face protects the inner magnet and limit the overall height of the microphone.
Aimant dipolaire externe External dipole magnet
On peut prévoir un ensemble d'au moins un aimant dipolaire externe 60A, 60B..., en liaison magnétique avec au moins un noyau et présentant une polarité magnétique inverse dudit noyau. Chaque aimant dipolaire externe présente un axe de polarité magnétique. Ainsi chaque noyau présente une polarité N/S selon un axe de polarité magnétique et chaque aimant dipolaire externe 60A, 60B, présente une polarité inversée S/N selon un axe de polarité magnétique de préférence sensiblement parallèle. It is possible to provide an assembly of at least one external dipole magnet 60A, 60B ..., in magnetic connection with at least one core and having a reverse magnetic polarity of said core. Each external dipole magnet has a magnetic polarity axis. Thus each core has an N / S polarity along an axis of magnetic polarity and each external dipole magnet 60A, 60B, has an inverted polarity S / N along an axis of magnetic polarity preferably substantially parallel.
De préférence, on prévoit un premier aimant dipolaire externe 60A commun à l'ensemble des premières bobines (ou de leur noyau), et un deuxième aimant dipolaire externe 60B commun à l'ensemble des deuxièmes bobines (ou de leur noyau), voir figure 4. Par exemple les premier 60A et deuxième 60B aimants dipolaires externes sont des aimants parallélépipédiques identiques, par exemple alnico ou en ferrite, dont la longueur est au moins égale à la distance séparant les noyaux extrêmes d'un ensemble de premières bobines, ce qui permet d'obtenir une liaison magnétique pour l'ensemble des premières/deuxième bobines. La hauteur et la largeur des aimants parallélépipédiques dépendent de la nature des aimants (de l'intensité du champ magnétique) et de l'effet sonore recherché. On peut aussi prévoir un aimant dipolaire externe par noyauPreferably, there is provided a first external dipolar magnet 60A common to all the first coils (or their core), and a second external dipolar magnet 60B common to all of the second coils (or their core), see figure 4. For example the first 60A and second 60B external dipole magnets are identical parallelepiped magnets, for example alnico or ferrite, whose length is at least equal to the distance separating the extreme cores of a set of first coils, which makes it possible to obtain a magnetic connection for all the first / second coils. The height and width of the parallelepiped magnets depend on the nature of the magnets (the intensity of the magnetic field) and the desired sound effect. It is also possible to provide an external dipole magnet per core
(non représentés) . (not shown)
De préférence, chaque axe de polarité magnétique est parallèle à l'axe de polarité de la bobine avec laquelle il est en liaison magnétique. Preferably, each axis of magnetic polarity is parallel to the axis of polarity of the coil with which it is in magnetic connection.
De préférence, la polarité magnétique de chaque aimant dipolaire externe est inversée par rapport à la polarité de la bobine avec laquelle il est en liaison magnétique. Preferably, the magnetic polarity of each external dipole magnet is inverted with respect to the polarity of the coil with which it is in magnetic connection.
De préférence, chaque aimant dipolaire externe est disposé plus près de la face supérieure SUP que de la face inférieure INF, ce qui facilite l'établissement de lignes de champ du côté des cordes 13 de l'instrument. La présence de tels aimants dipolaires externes permet de notamment renforcer les fréquences médium et grave de l'instrument et de conserver des harmoniques. Preferably, each external dipole magnet is disposed closer to the upper face SUP than the lower face INF, which facilitates the establishment of field lines on the side of the strings 13 of the instrument. The presence of such external dipole magnets makes it possible in particular to reinforce the medium and low frequencies of the instrument and to conserve harmonics.
Adaptation de la puissance des aimants Adaptation of the power of magnets
En fonction du type d'aimant mis en œuvre, au regard de l'aimant dipolaire interne 40, on peut prévoir un ensemble d'au moins un shunt 41 (un shunt 41 par aimant dipolaire interne 40), disposé entre l'ensemble d'au moins un aimant dipolaire interne et les noyaux d'au moins une paire de bobines, pour atténuer l' intensité du champ magnétique dudit aimant dipolaire interne 40 au niveau desdits noyaux. Typiquement avec un aimant interne en samarium cobalt, un shunt peut être mis en œuvre. Avec un aimant alnico de dimensions appropriées, le shunt peut être optionnel .  Depending on the type of magnet used, with regard to the internal dipole magnet 40, it is possible to provide an assembly of at least one shunt 41 (a shunt 41 per internal dipole magnet 40), disposed between the set of at least one inner dipole magnet and the cores of at least one pair of coils, for attenuating the magnetic field strength of said inner dipole magnet 40 at said cores. Typically with an internal magnet samarium cobalt, a shunt can be implemented. With an alnico magnet of appropriate dimensions, the shunt can be optional.
De manière similaire, au regard de l'aimant dipolaire externe, on peut prévoir un ensemble d'au moins un isolant magnétique et électrique 42A, 42B... disposé entre ledit ensemble d'au moins un aimant dipolaire externe 60 et un ensemble de blindages de première/deuxième bobines respectivement. De préférence, on prévoit un isolant magnétique et électrique respectif 42A, 42B par aimant dipolaire externe 60A, 60B. cet isolant magnétique et électrique permet de réduire l'intensité du champ magnétique de l'aimant dipolaire externe 60A, 60B au niveau des première bobine 20A, 21A, 22A, 23A, 24A, 25A et deuxième bobine 20B, 21B, 22B, 23B, 24B, 25B respectivement en éloignant l'aimant dipolaire externe 60A, 60B desdites bobines. Un isolant magnétique et électrique 42A, 42B peut être commun à un ensemble de bobines/blindages, comme illustré figure 4. Similarly, with respect to the external dipole magnet, it is possible to provide an assembly of at least one magnetic and electrical insulator 42A, 42B ... disposed between said set of at least one external dipole magnet 60 and a set of shields of first / second coils respectively. Preferably, there is provided a respective magnetic and electrical insulator 42A, 42B by external dipole magnet 60A, 60B. this magnetic and electrical insulator makes it possible to reduce the intensity of the magnetic field of the external dipole magnet 60A, 60B at the level of the first coil 20A, 21A, 22A, 23A, 24A, 25A and the second coil 20B, 21B, 22B, 23B, 24B, 25B respectively by moving the outer dipole magnet 60A, 60B away from said coils. A magnetic and electrical insulator 42A, 42B may be common to a set of coils / shields, as shown in FIG.
Par exemple un aimant dipolaire externe est commun à un ensemble de premières / deuxième bobines et solidaire dudit ensemble par l'intermédiaire d'un isolant magnétique lui-même solidaire de l'ensemble des blindages magnétiques desdites premières / deuxièmes bobines. For example, an external dipole magnet is common to a set of first / second coils and secured to said assembly by means of a magnetic insulator itself integral with all of the magnetic shields of said first / second coils.
L'isolant magnétique 42A, 42B est par exemple en bakélite. L'épaisseur de celui-ci est choisie en fonction de l'effet sonore recherché, et des dimensions et de la nature de l'aimant externe . The magnetic insulator 42A, 42B is for example bakelite. The thickness of the latter is chosen according to the desired sound effect, and the dimensions and nature of the external magnet.

Claims

REVENDICATIONS
1. Microphone (10) polyphonique passif à double bobinage pour instrument de musique à cordes (13) comprenant : A passive polyphonic double-coil microphone (10) for a stringed musical instrument (13) comprising:
- un support (11) ,  a support (11),
- un ensemble de paires de bobines, chaque paire de bobines comprenant une première bobine (20A, 21A, 22A, 23A, 24A, 25A) et une deuxième bobine (20B, 21B, 22B, 23B, 24B, 25B) , chaque bobine comprenant un noyau magnétique (30) et un bobinage (31) autour dudit noyau, une face supérieure (SUP) et une face inférieure (INF),  a set of pairs of coils, each pair of coils comprising a first coil (20A, 21A, 22A, 23A, 24A, 25A) and a second coil (20B, 21B, 22B, 23B, 24B, 25B), each coil comprising a magnetic core (30) and a coil (31) around said core, an upper face (SUP) and a lower face (INF),
- dans lequel pour chaque paire de bobines, les deux bobines sont montées électriquement en série et en liaison magnétique (LC) l'une avec l'autre,  in which for each pair of coils, the two coils are electrically connected in series and in magnetic connection (LC) with each other,
caractérisé en ce qu' il comprend en outre characterized in that it further comprises
- un ensemble d'au moins un aimant dipolaire interne (40), dont un pôle est en liaison magnétique avec le noyau d'une bobine d'une paire de bobines et l'autre pôle est en liaison magnétique avec le noyau de l'autre bobine de ladite paire,  an assembly of at least one inner dipole magnet (40), one pole of which is in magnetic connection with the core of a coil of one pair of coils and the other pole is in magnetic connection with the core of the another coil of said pair,
- un ensemble de blindages magnétiques, solidaires du support (11) ,  a set of magnetic shields secured to the support (11),
- chaque bobine étant entourée d'un blindage magnétique individuel respectif (50A, 51A, 52A, 53A, 54A, 55A, 50B, 51B, 52B, 53B, 54B, 55B) ,  each coil being surrounded by a respective individual magnetic shielding (50A, 51A, 52A, 53A, 54A, 55A, 50B, 51B, 52B, 53B, 54B, 55B),
dans lequel in which
- Pour chaque paire de bobines, l'une des bobines est équipée d'un fil électrique pour être reliée à une masse, et l'autre bobine est équipée d'un autre fil électrique pour le transport d'un signal de sortie vers un amplificateur, et  - For each pair of coils, one of the coils is equipped with an electric wire to be connected to a ground, and the other coil is equipped with another electric wire for the transport of an output signal to a amplifier, and
- les noyaux magnétiques d'une même paire de bobines sont positionnés pour capter les vibrations d'une seule et même corde . - The magnetic cores of the same pair of coils are positioned to capture the vibrations of one and the same rope.
2. Microphone 10 selon la revendication 1, dans lequel chaque blindage (50A, 51A, 52A, 53A, 54A, 55A ; 50B, 51B, 52B, 53B, 54B, 55B) présente une même polarité magnétique que celle de la bobine (20A, 21A, 22A, 23A, 24A, 25A ; 20B, 21B, 22B, 23B, 24B, 25B) qu'il contient. 2. Microphone 10 according to claim 1, wherein each shield (50A, 51A, 52A, 53A, 54A, 55A; 50B, 51B, 52B, 53B, 54B, 55B) has the same magnetic polarity as that of the coil (20A , 21A, 22A, 23A, 24A, 25A, 20B, 21B, 22B, 23B, 24B, 25B) contained therein.
3. Microphone 10 selon l'une quelconque des revendications précédentes, dans lequel les paires de bobines sont disposées de sorte que l'ensemble des premières bobines (20A, 21A, 22A, 23A, 24A, 25A) sont alignées selon une première droite, et l'ensemble des deuxièmes bobines (20B, 21B, 22B, 23B, 24B, 25B) sont alignées selon une deuxième droite. Microphone 10 according to any one of the preceding claims, wherein the pairs of coils are arranged so that all of the first coils (20A, 21A, 22A, 23A, 24A, 25A) are aligned along a first straight line, and the set of second coils (20B, 21B, 22B, 23B, 24B, 25B) are aligned along a second straight line.
4. Microphone 10 selon l'une quelconque des revendications précédentes, dans lequel l'ensemble d'au moins un aimant dipolaire interne (40) comprend The microphone of any one of the preceding claims, wherein the set of at least one inner dipole magnet (40) comprises
- un aimant dipolaire interne individuel respectif par paire de bobines.  a respective individual internal dipole magnet per pair of coils.
5. Microphone 10 selon l'une quelconque des revendications précédentes, dans lequel l'ensemble des paires de bobines présente une face supérieure, destinée à être positionnée en regard des cordes, et une face inférieure ; ledit ensemble d'au moins un aimant dipolaire interne (40) étant positionné du côté de la face inférieure. 5. Microphone 10 according to any one of the preceding claims, wherein the set of pairs of coils has an upper face, intended to be positioned opposite the strings, and a lower face; said set of at least one inner dipole magnet (40) being positioned on the underside side.
6. Microphone 10 selon l'une quelconque des revendications précédentes, comprenant en outre un ensemble d'au moins un shunt magnétique (41), disposé entre l'ensemble d'au moins un aimant dipolaire interne (40) et les noyaux (30) d'au moins une paire de bobines, pour atténuer l'intensité du champ magnétique dudit aimant dipolaire interne au niveau desdits noyaux. The microphone of any one of the preceding claims, further comprising an assembly of at least one magnetic shunt (41) disposed between the assembly of at least one inner dipole magnet (40) and the cores (30). ) at least one pair of coils, for attenuating the intensity of the magnetic field of said inner dipole magnet at said cores.
7. Microphone 10 selon l'une quelconque des revendications précédentes, comprenant en outre un ensemble d'au moins un aimant dipolaire externe (60A, 60B) , en liaison magnétique avec au moins un noyau (30) et présentant une polarité magnétique inverse dudit noyau. The microphone 10 according to any one of the preceding claims, further comprising a set of at least one external dipole magnet (60A, 60B), in magnetic connection with at least one core (30) and having a reverse magnetic polarity of said core.
8. Microphone 10 selon la revendication 7, dans lequel ledit ensemble d'au moins un aimant dipolaire externe (60A, 60B) est solidaire d' au moins un blindage magnétique par l'intermédiaire d'un isolant électrique et magnétique (42A, 42B) . 8. Microphone 10 according to claim 7, wherein said set of at least one external dipole magnet (60A, 60B) is secured to at least one magnetic shielding via an electrical and magnetic insulator (42A, 42B). ).
9. Microphone 10 selon l'une quelconque des revendications 7 ou 8, comprenant un premier aimant dipolaire externe (60A) commun à l'ensemble des premières bobines, et un deuxième aimant dipolaire externe (60B) commun à l'ensemble des deuxièmes bobines. 9. Microphone 10 according to any one of claims 7 or 8, comprising a first external dipolar magnet (60A) common to all of the first coils, and a second external dipolar magnet (60B) common to all second coils .
10. Microphone 10 selon l'une quelconque des revendications précédentes, dans lequel chaque blindage magnétique présente un premier évidement (50_E1) au niveau de la face supérieure, pour augmenter la densité de lignes de champ entre le noyau de la première bobine et le noyau de la deuxième bobine d'une paire de bobines donné. The microphone of any one of the preceding claims, wherein each magnetic shield has a first recess (50_E1) at the top face to increase the density of field lines between the core of the first coil and the core. of the second coil of a given coil pair.
11. Microphone 10 selon l'une quelconque des revendications 7 à 10, dans lequel chaque blindage magnétique présente un deuxième évidement (50_E2) au niveau de la face supérieure, pour augmenter la densité de lignes de champ entre le noyau de la bobine contenu dans le blindage et l'aimant dipolaire externe (60) en liaison magnétique avec ledit noyau. The microphone 10 according to any one of claims 7 to 10, wherein each magnetic shield has a second recess (50_E2) at the top face to increase the density of field lines between the core of the coil contained in the shield and the outer dipolar magnet (60) in magnetic connection with said core.
12. Microphone 10 selon l'une quelconque des revendications précédentes, dans lequel chaque blindage magnétique présente un évidement (50_E3) au niveau de la face inférieure, de sorte à permettre la pénétration d'une extrémité de l'aimant dipolaire interne (40) à l'intérieur du volume qu'aurait ledit blindage sans ledit évidement. Microphone 10 according to one of the preceding claims, wherein each magnetic shield has a recess (50_E3) at the lower surface, so as to allow penetration of one end of the dipole magnet. internal (40) within the volume that said shield would have without said recess.
13. Microphone 10 selon l'une quelconque des revendications précédentes, dans lequel l'ensemble des noyaux des premières bobines présente une même polarité magnétique entre eux, et l'ensemble des noyaux des deuxièmes bobines présente une même polarité magnétique entre eux, inversée par rapport à la polarité magnétique de l'ensemble des noyaux des premières bobines. 13. Microphone 10 according to any one of the preceding claims, wherein the set of cores of the first coils has the same magnetic polarity between them, and all the cores of the second coils has the same magnetic polarity between them, reversed by relative to the magnetic polarity of all the nuclei of the first coils.
14. Instrument de musique à cordes équipé d'un micro 10 selon l'une quelconque des revendications précédentes. 14. Stringed musical instrument equipped with a microphone 10 according to any one of the preceding claims.
15. Système pour l'amplification d'un instrument de musique à cordes, le système comprenant un instrument de musique à cordes équipé d'un micro 10 selon l'une quelconque des revendications 1 à 13, et un dispositif d'amplificateur électrique connectable électriquement à la sortie dudit microphone. 15. System for amplifying a stringed musical instrument, the system comprising a stringed musical instrument equipped with a microphone 10 according to any one of claims 1 to 13, and a connectable electrical amplifier device electrically at the output of said microphone.
EP12802892.5A 2011-06-20 2012-06-19 Passive polyphonic double-coil microphone for a string musical instrument Active EP2721601B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1155404A FR2976757B1 (en) 2011-06-20 2011-06-20 DOUBLE WINDING PASSIVE POLYPHONIC MICROPHONE FOR A STRING MUSIC INSTRUMENT
PCT/FR2012/000248 WO2012175824A2 (en) 2011-06-20 2012-06-19 Passive polyphonic double-coil microphone for a string musical instrument

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3483303A (en) * 1965-07-29 1969-12-09 Lorenzo A Warner Elongated pickup for metal stringed musical instruments having ferromagnetic shielding
US3715446A (en) * 1971-06-22 1973-02-06 Gulf & Western Industries Magnetic pickup for stringed musical instruments
DE9011068U1 (en) * 1990-07-26 1990-09-27 Schmidts, Rudolf, 8023 Pullach Electromagnetic pickup for electric string instruments
US5290968A (en) * 1992-04-17 1994-03-01 Frank Mirigliano Magnetic pickup for musical instruments
US5464948A (en) * 1994-04-22 1995-11-07 Actodyne General, Inc. Sensor assembly for a stringed musical instrument
FR2750526B1 (en) * 1996-06-26 1998-12-11 Latour Saint Ygest Emile De ANALOGUE POLYPHONIC DISTORTION FOR ELECTRIC GUITARS
US7285714B2 (en) * 2005-09-09 2007-10-23 Gibson Guitar Corp. Pickup for digital guitar

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012175824A3 *

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