• 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 method of adjusting the volume gain applied in an amplifier controlling at least one loudspeaker of an enclosure according to the desired volume gain selected by a user on a scale plus a maximum desired volume gain, comprises steps of: - determining (204) the effective intensity applied to at least one loudspeaker, - calculating (206 and 208) a maximum volume gain from: - the desired volume gain, - the intensity effective applied to the loudspeaker, - of the thermal characteristics of the loudspeaker, - of the maximum desired volume gain, - calculation (210) of an increasing monotonic function giving a variable applied gain of volume according to the desired volume gain such as that the image of the maximum desired volume gain by the monotonic function is equal to the maximum volume gain, - application (212) to the amplifier, as the applied volume gain, the minimum of the maximum volume gain and the gain App volume variable for the desired volume gain.
    公开号:FR3031853A1
    申请号:FR1550408
    申请日:2015-01-19
    公开日:2016-07-22
    发明作者:Eduardo Mendes；Pierre-Emmanuel Calmel
    申请人:Devialet SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a method for adjusting the volume gain applied in an audio amplifier controlling at least one loudspeaker of an enclosure in function. the desired volume gain chosen by a user on a scale plus a desired maximum volume gain.
    [0002] An electrodynamic loudspeaker is an electromechanical device that is intended to convert an electrical voltage that is applied at its terminals to an acoustic pressure. Due to the electrical resistance of the speaker coil and the current flowing through it, thermal heating occurs. The speaker has some ability to dissipate in its environment, the thermal energy it creates. However, when the electrical energy received by the loudspeaker produces thermal energy greater than it can dissipate, the temperature of the speaker coil may increase beyond a permissible value that leads to the destruction of the loudspeaker coil. of the coil and therefore of the loudspeaker. It is known to implement methods and devices that limit the thermal power produced by the speaker, limiting the current flowing in the coil. These methods commonly use the voltage applied to the loudspeaker to send it into a model whose output is compared to a threshold to act on the voltage applied to the speaker. More complex models measure the current flowing through the coil. To prevent overheating of the speaker, the desired volume gain by the user is automatically reduced so as to limit the thermal power in the speaker. The desired volume gain is the set point applied by the user to adjust the sound level produced by the speakers. The user perceives this variation. To mitigate the perceived variation by the user of the time constants limiting the rate of change of the desired volume gain are added to the power limiting device. The devices for limiting the speed of variation are difficult to adjust and most of the time lead to a pumping phenomenon. The invention aims to limit the thermal power dissipated by the speaker while avoiding the perception of the variation of the energy supplied to the loudspeaker by the user and the pumping phenomena. For this purpose, the subject of the invention is a method of the aforementioned type, characterized in that it comprises the steps of: determining the effective intensity applied to at least one loudspeaker, calculating a gain of maximum volume from: - the desired volume gain, - the effective loudness applied to the loudspeaker, - the thermal characteristics of the loudspeaker, - the maximum desired volume gain, - calculation of an increasing monotonic function. a variable applied volume gain according to the desired volume gain such that the image of the maximum desired volume gain by the monotone function is equal to the maximum volume gain, - application to the amplifier, as the applied volume gain , the minimum of the maximum volume gain and the variable applied volume gain for the desired volume gain. According to particular modes of implementation, the method comprises one or more of the following characteristics: the monotonic function is an affine function; - the monotonic function is given by: (GVolume) max variable = (GVolume) max X GVolume desired - (GVolume) max a + (1- a) x GVolume desired) max (GV0 / ume) max where a is a value between 0 and 1; (GVolume) max variable is the applied variable volume gain; (GVolume) max is the maximum volume gain; (G Volumedereired) is the desired volume gain; and (G Volumetired) max is a maximum desired volume gain. a step of calculating the maximum individual volume gain is performed for each loudspeaker from: the desired volume gain, the effective intensity applied to the loudspeaker, the thermal characteristics of the loudspeaker, and the maximum volume gain is determined from the individual maximum volume gains. - the maximum volume gain is the minimum of the individual maximum volume gains and the maximum desired volume gain. The subject of the invention is also an amplifier comprising: means for determining the effective intensity applied to at least one loudspeaker; means for calculating a maximum volume gain from: the desired volume gain, the effective intensity applied to the loudspeaker, the thermal characteristics of the loudspeaker, the desired maximum volume gain means for calculating an increasing monotonic function giving a variable applied gain of volume as a function of the desired volume gain such that the image of the maximum desired volume gain by the monotone function is equal to the maximum volume gain; and - means for applying to the amplifier, as the applied volume gain, the minimum of the maximum volume gain and the variable applied volume gain for the desired volume gain. The invention will be better understood on reading the following description given solely by way of example and with reference to the drawings, in which: FIG. 1 is a schematic view of a sound reproduction installation; FIG. 2 is a flowchart of the method for continuously adjusting the amplification volume; and FIG. 3 is a curve illustrating the amplification volume applied as a function of the desired amplification volume by implementing the method of FIG. 2. The sound reproduction installation 10 illustrated in FIG. for producing an audio signal, such as a digital disk player connected to a loudspeaker 14 through an amplifier 16. The amplifier 16 comprises a voltage amplification stage 18 at the output of which is connected the loudspeaker 14. Between the source 12 and the input of the amplification stage 18, the amplifier comprises a stage 20 for adjusting the sound level according to a applied applied volume gain (GVolume) applied whose output is connected to a control stage 22 capable of supplying an excitation signal of the loudspeaker which is supplied to the amplification unit 18. The control stage 22 is able in particular to calculate the voltage U and the intensity I to be applied to the speaker so that the membrane of the loudspeaker is at each moment in a given position with a speed, an acceleration, a derivative of the acceleration with respect to the time suitable for reproducing the signal received by the control unit 22. In particular, the control stage 22 is capable of determining the intensity I which, at each moment, will flow in the loudspeaker 14 after amplification by the amplification stage 18 as a function of the desired dynamic parameters for the speaker.
    [0003] The amplifier 16 further comprises a unit 24 for managing the sound volume. This unit 24 is able to define and address the applied volume gain (Gvolume) applied to the sound volume adjustment stage 20, to which its output is connected. The unit 24 is connected to input means 26 of a desired volume gain denoted GVolume desired corresponding to an expression of the desired sound level by the user. These means 26 are formed for example of a sound volume adjustment potentiometer manually accessible by the user. The desired volume gain GVolume desired is manually adjustable on a scale from a minimum value to a maximum value designated by (G Desired volume) max - The volume management unit 24 is connected to the control stage 22 to receive the instantaneous current I. The unit 24 comprises means 28 for calculating a variable applied variable gain (GVolume) max variable and means 30 for comparison to which are connected the input means 26 and the means of The comparison means 30 are adapted to provide, at the sound level adjustment stage, the applied volume gain (Gvolume) applied, following a comparison between the values of the desired volume gain GVolume desired and the variable applied volume gain (G Volume) max variable. The elements described here are implemented in part for each of the speaker speakers of the installation, which have different mechanical and / or electrical characteristics, and / or which must reproduce different source signals. Thus, the control unit 22 is able to perform a calculation of the instantaneous current 1, for each speaker i and the sound volume management unit 24 receives each of the instantaneous currents 1,. The operation of the amplifier, in particular the sound volume management unit 24, is illustrated in FIG. 2. At the step 202, the unit 24 receives the currents 1, which should flow in the loudspeakers 14 to to obtain the dynamic magnitudes of the loudspeakers 14. Each stream 1, is provided by the control stage 22 which, from the musical signal to be reproduced and the applied volume gain (Gvolume) applied Presented at the input of the Control stage 22 determines the current 1 to be circulated and the voltage U to be applied across the terminals of the loudspeaker i to obtain the desired dynamic quantities. Alternatively, the instantaneous current 1 is measured at the terminals of the loudspeaker 14. From the instantaneous value 1 ,, the rms value (acronym for Root Mean Square in English) of the instantaneous current applied to each loudspeaker noted (Irms) is determined in step 204 by the calculation means 28, for example by implementing a low-pass filter, over a chosen time depending on the thermal time constant of the loudspeaker. In step 206, for each loudspeaker i, a normalized rms value (Irms norm) i of the current at a unit volume gain is determined by the calculation means 28, by the formula: rms norm) - = (IMIS ). GVolume desired where desired GVolume is the value of the desired volume gain introduced by the user from the input means 26, and (Irms), is the rms value of the instantaneous current to be applied to the speaker. In step 208, a maximum volume gain ((Gvolume) max), is determined by the calculation means 28 according to the formula: where (GVolume max rms rms max) i rms max) i where (PI) max power maximum allowable thermal for the speaker i, and (Re), is the electrical resistance of the loudspeaker i. The maximum rms current (Irms max) i is thus determined from the resistor (Re), the loudspeaker and the maximum permissible thermal power (PI) max from the loudspeaker. At each moment, the maximum volume gain (GVolume max) i therefore depends on the effective intensity (Irma applied to the loudspeaker 14 as determined in step 204. A maximum volume gain (Gvolume) max for l the set of loudspeakers 1 to n 30 is calculated by the calculation means 28 in the following relation: (GVolume) max = min (0.999 x (GVolume déiré) max, (GVolume max, - - - (GVolume max This value of maximum volume gain (Gvolume) max is the minimum value of the individual maximum volume gains (GVolume max) i of each loudspeaker and the maximum desired volume gain (Gvolume max) i which is reduced by 0.1% for reasons for calculation implementation.
    [0004] In step 210, the calculation means 28 integrated in the sound volume management unit 24 determine a variable applied variable gain (GVolume) max according to the following formula: (GVolume) max variable - (GVolume) max X a + (1 - a) GVolume desired - (GVolume) max x GVolume desired) x (GVolume) max) where: - a is a value between 0 and 1 corresponding to the maximum allowed power proportion from which a power limitation begins to act. This value is fixed to the design of the amplifier. (G volume) max variable is the variable applied volume gain (Gvolume) max is the maximum volume gain (G desired volume) is the desired volume gain (G desired volume) max is a maximum desired volume gain More generally, the variable variable gain (Gvolume) max variable is an increasing monotonous function, for example an affine function, giving a variable applied volume gain (GVolume) max variable depending on the desired volume gain Gvolume desired such as an image of the maximum desired volume gain (Gvolume d by desired) max monotone function equal to the maximum gain gain (Gvolume) max.
    [0005] In step 212, the comparison means 30 determines the applied volume gain (Gvolume) applied by the sound level adjustment stage 20 as the minimum of the desired desired volume gain (Gvolume) and the volume gain. applied variable (Gvolume) max variable, that is to say: (GVolume) applied Min (Gvolume desired (GVolume) max variable) In Figure 3 is illustrated the applied volume gain (Gvolume) applied according to the gain of desired volume (Gvoiume) desired.
    [0006] The curve in solid line represents the relation between these two quantities for a maximum volume gain (Gvoidme) max equal to 10, a coefficient equal to 0.8 and a maximum desired volume gain (G Volumed ésiré) max equal to 30 In this case, it is understood that the applied volume (GVolume) applied is equal to the desired volume gain GVolume desired up to the point of intersection between the monotonic function designated by the reference 302 and the righthand section corresponding to the identity identified. by reference 304. The straight section 302 corresponding to the increasing monotonic function passes through the point whose abscissa 30 is the maximum desired volume gain and the point whose ordinate 10 corresponds to the maximum volume gain. (Its director coefficient, given by (1 a) (GVolume desired and GVolume desired) x (GVolume) max) is proportional to the value 1-a retained. In mixed line is represented the function giving the applied volume gain (GVolume) applied as a function of the desired volume gain (Gvoidme) desired for a maximum volume gain (Gvoidme) max equal to 14 and a coefficient maintained equal to 0, 8. It is understood that at each moment, the shape of the curve giving the applied volume gain (GVolume) applied as a function of the desired volume gain GVolume desired varies depending on the variation of the music and the currents l ,. Given the fact that the effective currents (Irms) i are obtained by low-pass filtering, their variations are slow with regard to the variations of the musical signal. Thus, the possible decrease in applied volume gain (GVolume) applied is slow and does not produce parasitic noise. The device is of the predictive type and therefore has no loopback which could cause an instability or an undesirable pumping effect.
    [0007] The volume gain applied for the control of each loudspeaker is a priori identical for each speaker. In a variant, it is different for each of the loudspeakers. Given the presence of the monotonic function, the method of limiting the thermal power is such that a modification of the desired volume gain Gvoidme desired by the user causes a change in the applied volume (G Volume) applies with the same direction of variation even if it is not in the same proportions while limiting the power by each speaker.
    [0008] Thus, the user is not confused by the perception of not taking into account his instruction to vary the desired volume from the input means 26, even if the amplifier operates at a value close to its limit value of amplification.5
    权利要求:
    Claims (6)
    [0001]
    CLAIMS- A method of adapting the applied volume gain ((GVolume) applied) in an amplifier (16) controlling at least one loudspeaker (14) of an enclosure according to the desired volume gain (desired Gvolume) selected by a user on a scale plus a desired maximum volume gain ((desired volume) max), comprising steps of: - determining (204) the effective intensity (Irr ,, $) applied to at least one loudspeaker; loudspeaker, - calculation (206, 208) of a maximum volume gain "Gvoiu me, max, from: - the desired volume gain (G Volumedesiréiré), - the effective intensity (Irms) applied to the loudspeaker , - of the thermal characteristics ((Pi) max, (Re) i) of the loudspeaker, - of the maximum desired volume gain ((Gvoisumedired) max), - calculation (210) of an increasing monotonic function giving a gain of variable applied volume (Gvoiu me, max variable) according to the desired volume gain (GVolume desired) such as the image of the volum gain desired maximum ((GVolume desired) max) by the monotonic function is equal to the maximum volume gain ((Gvoiu me, max), - application (212) to the amplifier, as the applied volume gain ((GVolume) applied), the minimum of the maximum volume gain (GVolume max) and the variable applied volume gain ((GVolume) max variable) for the desired volume gain (GVolume desired).
    [0002]
    2. A process according to claim 1, characterized in that the monotonic function is an affine function.
    [0003]
    3. Method according to claim 1 or 2, characterized in that the monotonic function is given by: GVolume desired (GVolume) max (GVolume) max variable = (GVolume) max xa + (1 - x (GVolume desired) max - (GVolume) max where a is a value between 0 and 1; (Gvolume) max variable is the applied volume gain variable, (Gvolume) max is the maximum volume gain; (G Volumedesired) is the volume gain desired, and (GVolume desired) max is a desired maximum volume gain.
    [0004]
    4. A method according to any one of the preceding claims, characterized in that a step of calculating the maximum individual volume gain ((Gvolume) max I) is performed for each speaker (i) from: - the desired volume gain (desired brightness), - effective intensity (lrms) applied to the loudspeaker, - thermal characteristics (Pi) max, (Re) i) of the loudspeaker, and the maximum volume gain ( Gvoiume max) is determined from the individual maximum volume gains ((Gvoiume max) i) -
    [0005]
    5. A method according to claim 4, characterized in that the maximum volume gain (Gvolume max) is the minimum of the maximum individual volume gains (Gvolume max) i) and the desired maximum volume gain (GVolume desired) max) -
    [0006]
    6. An amplifier (16) comprising: means (26) for inputting a desired volume gain (desired gain) for the user by a user on a scale plus a maximum desired volume gain (Gvoiume). d 1 1 ésiré, max ,, - means of adaptation of the volume gain applied ((Gvolu me / applied) by the amplifier at least one loudspeaker (14) of an enclosure according to the desired volume gain (G Volumedesire) chosen, the amplifier comprising: - means for determining the effective intensity (Irms) applied to at least one speaker, - means for calculating a maximum volume gain ((Gvoiume) max ) from: - the desired volume gain (G Volumedeeired), - the effective intensity (lrms) applied to the loudspeaker, - the thermal characteristics (Pi) max, (Re) i) of the loudspeaker, - the desired maximum volume gain ((GVolume desired) max), - means for calculating an increasing monotonic function giving a gain in volume applied varia variable (Gvolu me, max variable) according to the desired volume gain (Gvolume desired) such that the image of the desired maximum volume gain ((GVolume desired) max) by the monotonic function is equal to the maximum volume gain ( (Gvolume) max), - means for applying (212) to the amplifier, as the applied volume gain ((Gvolume) applied), the minimum of the maximum volume gain (Gvolume max) and the applied volume gain variable ((Gvolume) max variable) For the desired volume gain (Gvolume desired).
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    同族专利:
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    法律状态:
    2015-12-24| PLFP| Fee payment|Year of fee payment: 2 |
    2016-07-22| PLSC| Publication of the preliminary search report|Effective date: 20160722 |
    2017-01-05| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-22| PLFP| Fee payment|Year of fee payment: 4 |
    2019-12-12| PLFP| Fee payment|Year of fee payment: 6 |
    2020-12-30| PLFP| Fee payment|Year of fee payment: 7 |
    2021-12-10| PLFP| Fee payment|Year of fee payment: 8 |
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