• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a device for controlling a loudspeaker (14) in an enclosure comprising: an input for an audio signal (Saudio_ref) to be reproduced; a supply output of an excitation signal of the loudspeaker; means (26, 36, 38, 70, 80, 90) for calculating at each moment the excitation signal of the loudspeaker (14) as a function of the audio signal (Saudio_ref). It comprises upstream means (26, 36, 38, 70, 80, 90) for calculating the excitation signal, means (24, 25) for calculating a desired dynamic magnitude (Aref) of the top membrane as a function of the audio signal (Saudio_ref) to be reproduced and the structure of the loudspeaker, the means (25) for calculating the desired dynamic magnitude (Aref) of the loudspeaker membrane being suitable for applying a different correction of the identity, and taking into account the dynamic dynamic quantities (xo, vo) of the enclosure different from the only dynamic variables relating to the membrane of the loudspeaker, and the means (26, 36, 38, 70, 80, 90 to calculate the excitation signal of the loudspeaker are suitable for calculating the excitation signal as a function of the desired dynamic magnitude (Aref) of the loudspeaker membrane.
    公开号:FR3018024A1
    申请号:FR1451563
    申请日:2014-02-26
    公开日:2015-08-28
    发明作者:Eduardo Mendes；Pierre-Emmanuel Calmel；Antoine Petroff；Jean-Loup Afresne
    申请人:Devialet SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a device for controlling a loudspeaker in an enclosure comprising: an input for an audio signal to be reproduced; a supply output of an excitation signal of the loudspeaker; means for calculating at each instant, the excitation signal of the loudspeaker as a function of the audio signal. Speakers are electromagnetic devices that convert an electrical signal into an acoustic signal. They introduce a nonlinear distortion that can significantly affect the acoustic signal obtained. Many solutions have been proposed for controlling the loudspeakers in order to make it possible to eliminate the distortions of the behavior of the loudspeaker by an appropriate command.
    [0002] A first type of solution uses mechanical sensors, typically a microphone, in order to implement a servocontrol which makes it possible to linearize the operation of the loudspeaker. The major disadvantage of such a technique is the mechanical size and non-standardization of the devices as well as high costs.
    [0003] Examples of such solutions are described for example in the documents EP 1 351 543, US 6 684 204, US 2010/017 25 16 and US 5 694 476. In order to avoid the use of an undesirable mechanical sensor, Open loop type have been considered. They do not require expensive sensors. They may only use a measurement of the voltage and / or current applied across the loudspeaker. Such solutions are described, for example, in documents US Pat. No. 6,058,195 and US Pat. No. 8,023,668. However, these solutions have drawbacks in that all the non-linearities of the loudspeaker are not taken into account and these systems are complex to implement and do not offer any freedom for the choice of corrected behavior obtained from the equivalent speaker. Document US Pat. No. 6,058,195 uses a so-called "mirror filter" technique with current control. This technique makes it possible to eliminate nonlinearities in order to obtain a predetermined model. The estimator E implemented produces an error signal between the measured voltage and the voltage predicted by the model. This error is used by the update circuit of the parameters U. Given the number of estimated parameters, the convergence of the parameters towards their true values is highly unlikely under normal operating conditions. US 8,023,668 provides an open loop control model that compensates for unwanted loudspeaker behaviors relative to a desired behavior.
    [0004] For this, the voltage applied to the loudspeaker is corrected by an additional voltage which cancels the unwanted behaviors of the loudspeaker with respect to the desired behavior. The control algorithm is realized by discretization in discrete time of the loudspeaker model. This makes it possible to predict the position that the membrane will have at the next time and to compare this position with the desired position. The algorithm thus achieves a sort of infinite gain servo between a desired model of the loudspeaker and the loudspeaker model so that the loudspeaker follows the desired behavior. As in the previous document, the control implements a correction which is calculated at each instant and added to the input signal, even if this correction in US Pat. No. 8,023,668 does not implement a closed feedback loop. The mechanisms for calculating a correction added to the input signal do not take into account the structure of the enclosure when it is not a closed enclosure. The invention aims to provide a satisfactory control of a speaker disposed in an unclosed enclosure and which takes into account the structure of the enclosure.
    [0005] For this purpose, the subject of the invention is a device for controlling a loudspeaker of the aforementioned type, characterized in that it comprises, upstream, means for calculating the excitation signal, means for calculating a desired dynamic magnitude of the loudspeaker membrane according to the audio signal to be reproduced and the structure of the enclosure, the means for calculating the desired dynamic magnitude of the speaker membrane being adapted to apply a different correction of the identity, and taking into account the dynamic dynamic dimensions of the enclosure different from the only dynamic variables relating to the speaker membrane, and the means for calculating the excitation signal of the loudspeaker are suitable for calculating the signal of the loudspeaker. excitation as a function of the desired dynamic magnitude of the speaker diaphragm.
    [0006] According to particular embodiments, the control device comprises one or more of the following characteristics: the enclosure comprises a vent and the dynamic structural quantities of the enclosure comprise at least one derivative of predetermined order of the position of the air moved by the enclosure; the structural dynamic quantities of the enclosure comprise the position of the air displaced by the enclosure; the structural dynamic quantities of the enclosure comprise the speed of the air displaced by the enclosure; the enclosure is a vented enclosure and the structural dynamic quantities of the enclosure depend on at least one of the following parameters: acoustic leakage coefficient of the enclosure; inductance equivalent to the air mass in the vent; - compliance of the air in the enclosure; the enclosure is a passive radiator enclosure and the dynamic structural magnitudes of the enclosure depend on at least one of the following parameters: acoustic leakage coefficient of the enclosure; inductance equivalent to the mass of the passive radiator membrane; - compliance of the air in the enclosure - mechanical losses of the passive radiator - mechanical compliance of the membrane.
    [0007] The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings, in which: FIG. 1 is a diagrammatic view of a sound reproduction installation; FIG. 2 is a curve illustrating a desired model of sound reproduction for the installation; FIG. 3 is a schematic view of the loudspeaker control unit; FIG. 4 is a detailed schematic view of the structural adaptation unit; FIG. 5 is a detailed schematic view of the unit for calculating reference dynamic quantities; FIG. 6 is a view of a circuit representing the mechanical modeling of the loudspeaker with a view to its control in an enclosure equipped with a vent; FIG. 7 is a view of a circuit representing the electrical modeling of the loudspeaker with a view to its control; FIG. 8 is a schematic view of a first embodiment of the open loop estimation unit of the loudspeaker resistor; FIG. 9 is a view of a circuit of the thermal model of the loudspeaker; FIG. 10 is a view identical to that of FIG. 8 of an alternative embodiment of the closed loop estimation unit of the loudspeaker resistor; and FIG. 11 is a view identical to that of FIG. 6 of another embodiment for an enclosure provided with a passive radiator.
    [0008] The sound reproduction installation 10 illustrated in FIG. 1 comprises, as known per se, a module 12 for producing an audio signal, such as a digital disk player connected to a loudspeaker 14 of a loudspeaker. by means of a voltage amplifier 16. Between the audio source 12 and the amplifier 16 are arranged, successively in series, a desired model 20, corresponding to the desired model of behavior of the enclosure, and a control device 22 This desired model is linear or nonlinear. According to a particular embodiment, a loop 23 for measuring a physical quantity, such that the temperature of the magnetic circuit of the loudspeaker or the current flowing in the coil of the loudspeaker is provided between the loudspeaker 14 and the control device 22.
    [0009] The desired model 20 is independent of the speaker used in the installation and its modeling. The desired model 20 is, as illustrated in FIG. 2, a function expressed as a function of the frequency of the ratio of the amplitude of the desired signal denoted S'dio ref on the amplitude S'dio of the input signal coming from the module 12.
    [0010] Advantageously, for frequencies lower than a frequency Gin, this ratio is a function converging towards zero when the frequency tends to zero, to limit the reproduction of excessively low frequencies and thus avoid displacements of the speaker membrane out of the recommended ranges. by the manufacturer.
    [0011] It is the same for high frequencies where the ratio tends to zero beyond a frequency fmax when the frequency of the signal tends to infinity. According to another embodiment, this desired model is not specified and the desired model is considered as unitary. The control device 22, whose detailed structure is illustrated in FIG. 3, is arranged at the input of the amplifier 16. This device is able to receive as input the audio signal Saud ° ref to be reproduced as defined at the output of the model. 20 and to output a signal Uref, forming a speaker excitation signal which is supplied for amplification to the amplifier 16. This signal Uref is adapted to take into account the non-linearity of the loudspeaker 14 .
    [0012] The control device 22 comprises means for calculating different quantities as a function of the values of derivatives or integrals of other quantities defined at the same times. For computational requirements, the values of the unknown quantities at the instant n are taken equal to the corresponding values of the instant n-1. The values of the instant n-1 are preferably corrected by a prediction at the order 1 or 2 of their values using the derivatives of higher orders known at time n-1.
    [0013] According to the invention, the control device 22 implements a control using in part the principle of the differential flatness which makes it possible to define a reference control signal of a differentially flat system from sufficiently smooth reference paths.
    [0014] As illustrated in FIG. 3, the control module 22 receives as input the audio signal S'clio ref to be reproduced from the desired model 20. A unit 24 for applying a unit conversion gain, depending on the voltage peak of the amplifier 16 and a variable attenuation between 0 and 1 controlled by the user, ensures the passage of the reference audio signal Ded ret to a yo signal, image of a physical quantity to reproduce. The signal yo is, for example, an acceleration of the air opposite the loudspeaker or a speed of the air to be displaced by the loudspeaker 14. In the following, it is assumed that the signal yo is the acceleration of the air set in motion by the enclosure. At the output of the amplification unit 24, the control device comprises a unit 25 for structural adaptation of the signal to be reproduced as a function of the structure of the enclosure in which the loudspeaker is used. This unit is able to provide a reference variable Aret desired at each instant for the speaker membrane from a corresponding quantity, here the signal yo, for the movement of the air set in motion by the enclosure comprising the speaker. Thus, in the example under consideration, the reference quantity Aret, calculated from the acceleration of the air to be reproduced yo, is the acceleration to be reproduced for the speaker membrane so that the operation of the loudspeaker impose on the air an acceleration yo. FIG. 4 shows a detail of the structural adaptation unit 25. The input y 0 is connected to a bounded integration unit 27 whose output is itself connected to another bounded integration unit 28.
    [0015] Thus, at the output of the units 27 and 28 are obtained respectively the first integral vo and the second integral xo of the acceleration yo. The bounded integration units are formed of a first-order low-pass filter and are characterized by a FogF cut-off frequency. The use of bounded integration units allows the quantities used in the control device 22 to be the derivatives or the integrals of each other only in the useful bandwidth, ie for the higher frequencies. at the FoeF cutoff frequency. This makes it possible to control the excursion at low frequency of the quantities considered. In normal operation, the cutoff frequency FoBF is chosen so as not to influence the signal at the low frequencies of the useful bandwidth.
    [0016] The cut-off frequency FogF is taken less than one-tenth of the frequency f ,,, of the desired model 20. In the case of a vent enclosure in which the loudspeaker is mounted in a case opened by a vent, the unit 25 produces the desired reference acceleration for the membrane Aref by the following relation: Km2 Km2 Aref = YD = Yo + Rm2 vo + Ms) c0 With: Rm2: coefficient of acoustic leakage of the enclosure; Ms.: inductance equivalent to the air mass in the vent; Km2: stiffness of the air in the enclosure. x0: position of the total air displaced by the diaphragm and the vent Vo = dr ° -dt: speed of the total air displaced by the diaphragm and the vent dvo yo = -dt: acceleration of the total air displaced . In this case, the desired reference acceleration for the Aret membrane is corrected for structural dynamic magnitudes x o, v, of the enclosure, the latter being different from the dynamic quantities relating to the speaker membrane. This reference quantity Aret is introduced into a calculation unit 26 of reference dynamic quantities capable of providing, at each moment, the value of the derivative with respect to the time of the reference variable denoted dAref / dt as well as the values of the integrals. first and second with respect to the time of this reference variable noted respectively Vref and Xref. The set of reference dynamic quantities is noted in the Gref suite. FIG. 5 illustrates a detail of the computing unit 26. The input Aret is connected to a branching unit 30 on the one hand and to a bounded integration unit 32 on the other hand whose output is it -connected to another bounded integration unit 34.
    [0017] Thus, at the output of the units 30, 32 and 34 are respectively obtained the derivative of the acceleration dArevdt, the first integral Vref and the second integral Xref of the acceleration. The bounded integration units are formed of a first-order low-pass filter and are characterized by a FogF cut-off frequency. The use of bounded integration units allows the quantities used in the control device 22 to be the derivatives or the integrals of each other only in the useful bandwidth, ie for the higher frequencies. at the FoeF cutoff frequency. This makes it possible to control the excursion at low frequency of the quantities considered.
    [0018] In normal operation, the cutoff frequency FoBF is chosen so as not to influence the signal at the low frequencies of the useful bandwidth. The cutoff frequency FogF is taken less than one tenth of the frequency f ,,, of the desired model 20.
    [0019] The control device 22 comprises, in a memory, a table and / or a set of electromechanical parameter polynomials 36 and a table and / or a set of polynomials of the electrical parameters 38. These tables 36 and 38 are suitable for defining , depending on the dynamic reference values G ref received at the input, the electromechanical parameters Pmeca and electrical Pélec Pelec respectively. These parameters Pméca and Pé are obtained respectively from a mechanical modeling of the loudspeaker as illustrated in FIG. 6, where the loudspeaker is supposed to be installed in a vent enclosure, and from an electrical model of the top. As shown in FIG. 7, the electromechanical parameters Pmeca include the magnetic flux picked up by the coil noted BI produced by the magnetic circuit of the HP, the stiffness of the loudspeaker denoted Kmt (xD), the viscous mechanical friction of the speaker noted Rmt, the mobile mass of the entire speaker noted Mmt, the stiffness of the air in the enclosure rated Km2, the acoustic leakage of the enclosure rated Rm2 and the air mass in the The modeling of the mechanical-acoustic portion of the loudspeaker placed in a vented enclosure illustrated in FIG. 6 comprises, in a single closed-loop circuit, a voltage generator 40 BI (xD, i). i corresponding to the driving force produced by the current flowing in the coil of the loudspeaker. The magnetic flux BI (xD, i) depends on the position xi, the membrane as well as the intensity i flowing in the coil. This modeling takes into account the viscous mechanical friction Rmt of the membrane corresponding to a resistor 42 in series with a coil 44 corresponding to the overall moving mass Mmt of the membrane, the stiffness of the membrane corresponding to a capacitor 46 of capacitance Cmt (xD) equals 1 / Kmt (xD). Thus, the stiffness depends on the xD position of the membrane. To account for the vent, the following parameters Rm2, Cm2 and Mm2 are used: Rm2: coefficient of acoustic leakage of the enclosure; Mm2: inductance equivalent to the air mass in the vent; Cm2 =: compliance of the air in the enclosure. In the modeling of FIG. 6, they respectively correspond to a resistor 47, a coil 48 and a capacitor 49 connected in parallel.
    [0020] In this model, the force resulting from the reluctance of the magnetic circuit is neglected.
    [0021] The variables used are: vD = -cixtp: speed of the speaker diaphragm yD = dvDdt: acceleration of the speaker diaphragm vL: air speed of the air leaks vp: speed the air output of the vent (port) vo = -dxo = vD + + vp total air speed displaced by the merlin: ria. ne and the vent dt yo = v °: acceleration of the total air displaced. dt The total sound pressure at 1 meter is given by: p = Psi) yo where SD: loudspeaker cross-section, nstr = 2: solid emission angle.
    [0022] The mechanico-acoustic equation corresponding to FIG. 10 is the following: dvD B1 (xD, i) i = Mnitdt + RnitvD + Knit (xD) xD + Kni2x0 Km2 Km2 The following relation links the different quantities: yo = yD - vo - Ms X0 Rm2 The modeling of the electrical part of the loudspeaker is illustrated in FIG. 7. The electrical parameters P elec include the inductance of the coil Le, the coil para-inductance L2 and the loss-iron equivalent R2.
    [0023] The modeling of the electrical part of the loudspeaker illustrated in FIG. 7 is formed of a closed-loop circuit. It comprises a generator 50 of electromotive force ue connected in series with a resistor 52 representative of the resistor Re of the coil of the loudspeaker. This resistor 52 is connected in series with an inductance Le (xD, i) representative of the inductance of the coil of the loudspeaker. This inductance depends on the intensity i flowing in the coil and the xD position of the membrane. To account for magnetic losses and variations in inductance due to the effect of eddy currents, a parallel circuit RL is connected in series at the output of the coil 54. A resistor 56 of value R2 (xD, i) depending on the position of the the xD membrane and intensity i flowing in the coil is representative of the loss-iron equivalent. Similarly, a coil 58 of inductance L2 (xD, i) also depends on the xD position of the membrane and the intensity i flowing in the circuit is representative of the para-inductance of the loudspeaker. Also connected in series in the modeling, a voltage generator 60 producing a voltage BI (xD, i) .v representative of the counter-electromotive force of the moving coil in the magnetic field produced by the magnet and a second generator 62 producing a voltage g (xD, i) .v with g (xD, i) = idLe (xD'i) representative of dxD the effect of the dynamic variation of the inductance with the position.
    [0024] In general, we notice that, in this modelization, the flux BI picked up by the coil, the stiffness Kmt and the inductance of the coil Le depend on the position xi, of the membrane, the inductance Le and the flow BI depend on also current i flowing in the coil.
    [0025] Preferably, the inductance of the coil Le, the inductance L2 and the term g depend on the intensity i, in addition to depending on the displacement xi, of the membrane. From the modelizations explained with regard to figures 6 and 7, the following equations are defined: (x D, i) ue = Ri + Le (xD, i) cli + R2 (i -i2) + BI (xD, i) vD + of L vD dt dx D L2 di2 = R (i - i2) dt BI (x D, i) i = Rmy D + M m, -dv D dt + K m, (x D) x D + K m2x 0 The control module 22 further comprises a unit 70 for calculating the reference current iref and its derivative ditvdt. This unit receives as input the reference dynamic variables Gref, the mechanical parameters Pméca, and the magnitudes xo and vo.
    [0026] This computation of the reference current Iref and its derivative of Irevdt satisfy the two equations: G1 (xref, i ref) i ref = R my ref M int A ref K m, (X r) X ref Km2X0 dt eef, ieef) i eef) = Rm, Aref M mtdAref I dt + Kmt (x ref) 12 ref + Km2V0 1 di, e (X ref ref) with Gi (xref, iref) B (x ref ref) - ref 2 dx Thus, the current iref and its derivative ditvdt are obtained by an algebraic calculation from the values of the vectors entered by an exact analytical calculation or a numerical resolution if necessary according to the complexity of Gi (x, i). The derivative of the current direudt is thus obtained preferably by an algebraic calculation or otherwise by numerical derivation. To avoid excessive displacement of the speaker diaphragm, a displacement Xmax is imposed on the control module. This is made possible by the use of a separate dynamic reference quantity calculating unit 26 and a structural matching unit. The limitation of the deflection is carried out by a device of "virtual wall" which prevents the membrane of the loudspeaker to exceed a certain limit related to Xmax. To do this, as the xref position approaches its threshold, the energy required for the position approaches the virtual wall becomes larger and larger (non-linear behavior) to be infinite on the wall with the possibility of imposing asymmetrical behavior. For this, the viscous mechanical friction 1 = 1, f 42 is increased non-linearly as a function of the xref position of the membrane. According to another embodiment, for the limitation of the deflection, the acceleration Aref is dynamically maintained within minimum and maximum limits which ensure that the position Xref of the membrane does not exceed X'x. In the case where, according to the embodiment, the deflection Xref of the membrane is limited to Xref sat, and the acceleration of the membrane Aref to Aret sat, the magnitudes xo and vo are recalculated at time n by the following algorithm: Ms VO sat (n) = Are f sat (n) - Km2 vo sat (n 1) Km2 X0 sat - 1) Rm2 -M2 VO sat (n) X0 sat (n) = bounded integrator of Vo sat ( n) (identical to 34) Vref sat (n) = Aref's bounded integrator sat (n) (identical to 32) The calculation of the reference current lref and its derivative dIref / dt then satisfy the two following equations: Gl (X ref _ sat ref) i ref R mtV ref _ sat M mt A ref _ sat K mt (X ref _ sat) X ref _sat K m2 X 0 _ sat (G1 (X ref _ sat ref) i ref R mt Aref _ sat M mt dA, f _ sat I dt + Kmt (xref) V sat - ref _ sat K m2V 0 _ sat dL e (x ref sat ref with Gi (xref sat ref) B1 (X ref In addition, the device of command 22 comprises a unit 80 for estimating the resistor Re of the loudspeaker.This unit 80 receives as input The dynamic reference values Gref, the intensity of the reference currents ref and its derivative tellf / dt and, depending on the embodiment envisaged, the temperature measured on the magnetic circuit of the loudspeaker Tm measured or the intensity measured through of the measured coil I measured- In the absence of measurement of the current flowing, the estimation unit 80 is of the form illustrated in FIG. 8. It comprises as input a module 82 for calculating the power and parameters and Thermal model 84. The thermal model 84 calculates the resistance Re from the calculated parameters, the determined power and the measured temperature Tm measured. FIG. 9 gives the general diagram used for the thermal model. In this model, the reference temperature is the internal air temperature of the enclosure Te. = bounded integrator of yo sat (n) (same as 32) d dd sat ref) - ref dx The temperatures considered are: Tb [° C]: winding temperature; Tm [OC]: temperature of the magnetic circuit; and Te [OC]: internal temperature of the enclosure assumed constant or, ideally, measured. The thermal power considered is: PJb [W]: thermal power supplied to the winding by Joule effect; The thermal model comprises, as illustrated in FIG. 9, the following parameters: Ctbb [J / K]: heat capacity of the winding; Rthbm [K / VV]: equivalent thermal resistance between the winding and the magnetic circuit; and Rthba [K / W]: equivalent thermal resistance between the winding and the internal temperature of the enclosure; The equivalent thermal resistances take into account the heat dissipation by conduction and convection. The thermal power PJb supplied by the current flowing in the coil is given by: / 311, (t) = (Tb) i2 (t) where Re (Tb) is the value of the electrical resistance at the temperature Tb: Re (Tb ) = R e (20 ° C) x (1 + 4.10-3 (Tb - 200 C)) where Re (20 ° C) is the value of the electrical resistance at 20 ° C. The thermal model given in FIG. 9 is the following: PJb dTbdt 1 1, f (Tm Tb) +) (Te - Tb) -1-C thb RthbmX Rthba (Vref Its resolution makes it possible to obtain the value of As a variant, as illustrated in FIG. 10, when the current i flowing in the coil is measured, the estimate of the resistor Re is ensured by a closed-loop estimator, for example of proportional integral type. This makes it possible to have a fast convergence time thanks to the use of an integral proportional corrector Finally, the control device 22 comprises a unit 90 for calculating the reference output voltage Uref, based on the dynamic quantities Reference reference Gref, reference current iref and its derivative ditf / dt, electrical parameters P-elec and resistor Re calculated by unit 80. This unit for calculating the reference output voltage uses the two equations: L2 (Xref , i ref) due di ref L2 (Xref, iref - R2 (Xref, iref dt dt dLe (X ref ref) VrefBl (X ref ref) V ref i ref dt ref The (X ref ref) say f dt + u2 U2 s (x, f, 4) In the case where the amplifier 16 is an amplifier in current and not in voltage as previously described, the units 38, 80 and 90 of the control device are suppressed and the output intensity of reference iref controlling the amplifier is taken out of the unit 70.
    [0027] In the case of an enclosure comprising a passive radiator formed of a membrane, the mechanical model of FIG. 6 is replaced by that of FIG. 11 in which the elements identical to those of FIG. 6 bear the same reference numerals. This module comprises in series with the coil Ms 48, corresponding to the mass of the passive radiator membrane, a resistor 202 and a capacitor 204 of value Cm3 = Kni3 respectively corresponding to the mechanical losses Rm2 of the passive radiator and to the mechanical stiffness Km3 of the passive radiator membrane. The reference acceleration of the Aret membrane is given by: Km2 Km2 A'f = yo + V0 + Ms with xoR given by filtering by a high-pass filter of xo: s2 XOR = xo s2 + Irt3RA / KA, r3 Ms m2 Thus, the structural adaptation structure 25 will have in series two bounded integrators for obtaining vo and xo from yo, then the calculation of xoR from xo by high-pass filtering with the additional parameters Rm3 and Km3 which respectively are the mechanical loss resistance and the mechanical stiffness constant of the passive radiator membrane. XOR
    权利要求:
    Claims (6)
    [0001]
    CLAIMS1.- Control device of a speaker (14) in a chamber comprising: - an input for an audio signal (Saudro_ref) to reproduce; a supply output of an excitation signal of the loudspeaker; means (26, 36, 38, 70, 80, 90) for calculating at each instant the excitation signal of the loudspeaker (14) as a function of the audio signal (Saudioref); characterized in that it comprises upstream means (26, 36, 38, 70, 80, -90) for calculating the excitation signal, means (24, 25) for calculating a desired dynamic quantity (Are ) of the loudspeaker membrane according to the audio signal (Sauclioref) to be reproduced and the structure of the speaker, the means (25) for calculating the desired dynamic magnitude (Aref) of the speaker membrane being adapted to apply a correction different from the identity, and taking into account the dynamic dynamic quantities (xo, vo) of the enclosure different from the only dynamic variables relating to the membrane of the loudspeaker, and in that the means (26, 36, 38, 70, 80, 90) for calculating the loudspeaker excitation signal are suitable for calculating the excitation signal as a function of the desired dynamic magnitude (Aref) of the loudspeaker diaphragm.
    [0002]
    2.- Device according to claim 1, characterized in that the enclosure comprises a vent and the structural dynamic variables (xo, vo) of the enclosure comprise at least one derivative of predetermined order of the position (x0) of the moved by the enclosure.
    [0003]
    3.- Device according to claim 1 or 2, characterized in that the structural dynamic variables (xo, vo) of the enclosure comprise the position of the air (x0) moved by the enclosure.
    [0004]
    4.- Device according to any one of the preceding claims, characterized in that the structural dynamic variables (xo, vo) of the enclosure comprise the speed (vo) of the air moved by the enclosure.
    [0005]
    5.- Device according to any one of the preceding claims, characterized in that the enclosure is a vent enclosure and the structural dynamic variables (xo, vo) of the enclosure depend on at least one of the following parameters: - acoustic leakage coefficient of the enclosure (Rm2) - inductance equivalent to the air mass in the vent (Mm2) - compliance of the air in the enclosure (Cm2 =). km2
    [0006]
    6.- Device according to any one of the preceding claims, characterized in that the enclosure is a passive radiator enclosure and the structural dynamic variables (xo, vo) of the enclosure depend on at least one of the following parameters: 5- coefficient of acoustic leakage of the enclosure (Rm2) - inductance equivalent to the mass of the passive radiator membrane (Mm2) - compliance of the air in the enclosure (Cm2 =) Km2 - mechanical losses of the passive radiator ( Rm3) - mechanical compliance of the membrane (Cm3 = Kra3
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    法律状态:
    2015-02-19| PLFP| Fee payment|Year of fee payment: 2 |
    2016-02-18| PLFP| Fee payment|Year of fee payment: 3 |
    2017-02-08| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-26| PLFP| Fee payment|Year of fee payment: 5 |
    2020-01-13| PLFP| Fee payment|Year of fee payment: 7 |
    2021-01-22| PLFP| Fee payment|Year of fee payment: 8 |
    2022-01-12| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1451563A|FR3018024B1|2014-02-26|2014-02-26|DEVICE FOR CONTROLLING A SPEAKER|FR1451563A| FR3018024B1|2014-02-26|2014-02-26|DEVICE FOR CONTROLLING A SPEAKER|
    CA2940980A| CA2940980A1|2014-02-26|2015-02-18|Device for controlling a loudspeaker|
    BR112016019790A| BR112016019790A2|2014-02-26|2015-02-18|device for controlling a speaker in an enclosure|
    KR1020167026351A| KR102267808B1|2014-02-26|2015-02-18|Device for controlling a loudspeaker|
    CN201580018388.0A| CN106165446B|2014-02-26|2015-02-18|Equipment for controlling loudspeaker|
    EP15706746.3A| EP3111669B1|2014-02-26|2015-02-18|Device for controlling a loudspeaker|
    PCT/EP2015/053429| WO2015128237A1|2014-02-26|2015-02-18|Device for controlling a loudspeaker|
    US15/121,633| US9924267B2|2014-02-26|2015-02-18|Device for controlling a loudspeaker|
    JP2016571470A| JP6628228B2|2014-02-26|2015-02-18|Device for controlling loudspeakers|
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