CN117376802A - Linear parameter acquisition method and system of audio playing device and audio playing device - Google Patents

Linear parameter acquisition method and system of audio playing device and audio playing device Download PDF

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CN117376802A
CN117376802A CN202210764147.2A CN202210764147A CN117376802A CN 117376802 A CN117376802 A CN 117376802A CN 202210764147 A CN202210764147 A CN 202210764147A CN 117376802 A CN117376802 A CN 117376802A
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audio playing
equivalent
impedance
playing device
linear parameter
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石磊
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Shanghai Awinic Technology Co Ltd
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Shanghai Awinic Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements

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  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
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  • Circuit For Audible Band Transducer (AREA)

Abstract

The application discloses a linear parameter acquisition method and system of audio playing equipment and the audio playing equipment. The linear parameter acquisition method of the audio playing device comprises the following steps: acquiring a first transfer function of electroacoustic equivalent circuit characterization of audio playing equipment; acquiring an impedance curve of the audio playing device in the audio playing process; obtaining a functional relation corresponding to the impedance curve to obtain a first impedance relation; constructing an error function according to the first transfer function and the first impedance relation; and calculating the linear parameter of the audio playing device according to the error function. The method reduces the cost in the linear parameter acquisition process and improves the stability of the linear parameter acquisition process.

Description

Linear parameter acquisition method and system of audio playing device and audio playing device
Technical Field
The application relates to the technical field of signal processing, in particular to a linear parameter acquisition method and system of audio playing equipment and the audio playing equipment.
Background
As electroacoustic devices in the field of electronic devices, audio playback devices such as micro speakers and/or speakers are increasingly used, and product performance is continuously improved. The parameter acquisition of the audio playing device is the basis of the electroacoustic conversion behavior in the identification device system, and plays a key role in the design, manufacture and quality control of the audio playing device such as a loudspeaker, wherein the small signal parameter is measured under the condition that the small signal excitation and the system output distortion are negligible, so the audio playing device is also called as a linear parameter. The linearity parameters can be used to characterize the low frequency performance of the speaker, which plays an important role in the design and production quality control of the audio playback device. Traditional linear parameter acquisition schemes require the use of external equipment, such as high-priced equipment like klippel (loudspeaker analysis tool), which is costly.
Disclosure of Invention
In view of this, the present application provides a method and a system for obtaining a linear parameter of an audio playing device, and an audio playing device, so as to solve the problem of high cost of the traditional linear parameter obtaining scheme.
The application provides a linear parameter acquisition method of audio playing equipment, which comprises the following steps:
acquiring a first transfer function of electroacoustic equivalent circuit characterization of audio playing equipment;
acquiring an impedance curve of the audio playing device in the audio playing process;
obtaining a functional relation corresponding to the impedance curve to obtain a first impedance relation;
constructing an error function according to the first transfer function and the first impedance relation;
and calculating the linear parameter of the audio playing device according to the error function.
Optionally, the obtaining a first transfer function of the equivalent circuit representation of the audio playing device includes: acquiring an electroacoustic equivalent circuit of the audio playing device; the first transfer function is constructed from the electroacoustic equivalent circuit.
Optionally, the electroacoustic equivalent circuit includes: the device comprises an electromotive force equivalent component, a first passage connected to one side of the electromotive force equivalent component and a second passage connected to the other side of the electromotive force equivalent component, wherein the electromotive force equivalent component is used for representing induced electromotive force generated by movement of a coil with an effective length l in a magnetic field of field intensity B, the first passage is used for representing electric signal blocking characteristics of audio playing equipment, and the second passage is used for representing power signal blocking characteristics of the audio playing equipment.
Optionally, the first path includes a voltage source, a first equivalent resistor, a first equivalent inductor and an eddy current effect component connected in series, one end of the voltage source is connected with the electromotive force equivalent component, the other end is connected with the first equivalent resistor, one end of the eddy current effect component is connected with the first equivalent inductor, and the other end is connected with the electromotive force equivalent component; the second path comprises an equivalent capacitor, a coil mass equivalent piece and a mechanical damping equivalent piece which are connected in series, one end of the equivalent capacitor is connected with the electromotive force equivalent component, the other end of the equivalent capacitor is connected with the coil mass equivalent piece, one end of the mechanical damping equivalent piece is connected with the coil mass equivalent piece, and the other end of the mechanical damping equivalent piece is connected with the electromotive force equivalent component; the eddy current effect assembly comprises a second equivalent inductance and a second equivalent resistance which are connected in parallel, wherein the second equivalent inductance and the second equivalent resistance are equivalent by the loudspeaker eddy current effect of the audio playing device at high frequency.
Optionally, the first transfer function includes:
wherein R is e Representing the first equivalent resistance, L e Represents a first equivalent inductance, bl represents an induced electromotive force generated by the electromotive force equivalent component, M ms Representing the mass of each component involved in vibration during the operation of the audio playing device, R ms Representing the mechanical damping of the audio playback device, C ms Representing the compliance of the vibration support part of the audio playing device, s representing s-domain variables, symbol representing multiplication, Z E (s) represents a first transfer function.
Optionally, the acquiring the impedance curve of the audio playing device during the audio playing process includes: when the audio playing device plays audio, respectively monitoring the working voltage and the working current of the audio playing device; acquiring first envelope data corresponding to the working voltage and second envelope data corresponding to the working current; an impedance curve is determined from the first envelope data and the second envelope data.
Optionally, said constructing an error function from said first transfer function and said first impedance relation comprises: acquiring initial parameters of the impedance curve characterization; substituting the initial parameters into the first transfer function to obtain a second impedance relational expression; and constructing an error function according to the second impedance relational expression and the first impedance relational expression.
Optionally, the obtaining the initial parameters of the impedance curve characterization includes: and identifying an upper frequency limit and a lower frequency limit on the impedance curve, and acquiring the initial parameters according to the upper frequency limit and the lower frequency limit.
Optionally, said constructing an error function from said second impedance relation and said first impedance relation comprises: a root mean square error between the second impedance relationship and the first impedance relationship is determined as the error function.
Optionally, the calculating the linear parameter of the audio playing device according to the error function includes: constructing constraint conditions according to the value ranges of the linear parameters of the audio playing equipment; and calculating a parameter value which enables the error function to take the minimum value based on the constraint condition, and obtaining the linear parameter.
The application also provides a linear parameter acquisition system of the audio playing device, which comprises:
the first acquisition module is used for acquiring a first transfer function of the electroacoustic equivalent circuit representation of the audio playing device;
the second acquisition module is used for acquiring an impedance curve of the audio playing device in the audio playing process;
the third acquisition module is used for acquiring a functional relation corresponding to the impedance curve to obtain a first impedance relation;
a construction module for constructing an error function from the first transfer function and the first impedance relation;
and the calculating module is used for calculating the linear parameter of the audio playing device according to the error function.
The application also provides an audio playing device, which comprises a processor and a storage medium; the storage medium has program code stored thereon; the processor is configured to invoke the program code stored in the storage medium to perform any of the above-described linear parameter acquisition methods of the audio playback apparatus.
According to the linear parameter obtaining method and system for the audio playing device and the audio playing device, the first transfer function of the electroacoustic equivalent circuit representation of the audio playing device is obtained, the impedance curve of the audio playing device in the audio playing process is obtained, the first impedance relation corresponding to the impedance curve is used for constructing an error function according to the first transfer function and the first impedance relation, so that the accuracy of the obtained linear parameter can be guaranteed, the corresponding linear parameter obtaining process does not need to use external equipment, and the cost in the linear parameter obtaining process is reduced.
Furthermore, the method and the device can calculate the linear parameter which enables the error function to take the minimum value based on the constraint condition, can avoid the problem of parameter non-convergence caused by the fact that the error function falls into the local minimum value, and improve the stability of the linear parameter acquisition process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for obtaining a linear parameter of an audio playing device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an electroacoustic equivalent circuit in an embodiment of the present application;
FIG. 3 is a schematic diagram of an impedance curve according to an embodiment of the present application;
FIG. 4 is a comparative schematic diagram of simulation analysis according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a linear parameter acquiring system of an audio playing device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an audio playing device according to an embodiment of the present application.
Detailed Description
The inventor researches a linear parameter acquisition scheme of the audio playing device, and finds that in order to reduce the cost of the linear parameter acquisition process, a related measurement function model is established by a data fitting mode to perform parameter identification, for example, a speaker impedance parameter model is adopted to measure a related impedance value, and a displacement parameter model is adopted to measure a related displacement value and the like. However, the function model often adopts a non-convex function, and special situations such as local minima and the like can be encountered in the identification process, and the special situations easily lead to inaccurate identification parameter results.
Aiming at the problems, the method and the device construct an error function according to the first transfer function and the first impedance relational expression, so that the linear parameter of the audio playing device is calculated according to the error function, the accuracy of the obtained linear parameter can be ensured, and the corresponding linear parameter obtaining process does not need to use external equipment, so that the cost in the linear parameter obtaining process is reduced; the linear parameter which enables the error function to take the minimum value is calculated based on constraint conditions, so that the problem of parameter non-convergence caused by the fact that the error function falls into a local minimum value can be avoided, the linear parameter can be accurately obtained in various situations, and the stability of the linear parameter obtaining process is improved.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. The various embodiments described below and their technical features can be combined with each other without conflict.
A first aspect of the present application provides a method for obtaining a linear parameter of an audio playing device, referring to fig. 1, where the method for obtaining a linear parameter of an audio playing device includes steps S110 to S150.
S110, acquiring a first transfer function of electroacoustic equivalent circuit characterization of the audio playing device.
The electroacoustic equivalent circuit is used for representing the blocking characteristic of at least one form of signal (such as an electric signal and the like) of the audio playing device in the working process by adopting an electromechanical component; the electromechanical components may include components corresponding to electrical signals such as voltage sources, equivalent resistances, equivalent inductances, and/or capacitances, and may also include components representing power signals such as coil mass and/or mechanical damping. The first transfer function is used for representing the input and output relation corresponding to the electroacoustic equivalent circuit, and can be determined according to the connection relation of all electromechanical components in the electroacoustic equivalent circuit.
S120, obtaining an impedance curve of the audio playing device in the audio playing process.
The step S120 may be performed to monitor the relevant electrical signal in real time when the audio playing device plays the audio, so as to obtain the impedance curve by measuring the relevant electrical signal in real time; the required impedance curve can also be obtained by a relevant transformation mode such as Fourier transformation.
S130, obtaining a functional relation corresponding to the impedance curve to obtain a first impedance relation.
The step S120 may obtain the first impedance relation by performing curve fitting on the impedance curve and/or calculating according to an electrical signal function associated with the impedance curve.
And S140, constructing an error function according to the first transfer function and the first impedance relation.
The specific form of the error function may be set according to the function characteristics of the first transfer function and the first impedance relational expression, and/or factors such as the accuracy index of the linear parameter obtaining process, for example, the error function may be a difference between the first transfer function and the first impedance relational expression, and for example, the error function may be a root mean square error between the first transfer function and the first impedance relational expression, and so on.
S150, calculating the linear parameter of the audio playing device according to the error function.
The step S150 can search the linear parameter when the error function is optimal, and reduce the difference between the linear parameter to be measured corresponding to the first transfer function and the actually measured linear parameter corresponding to the first impedance relational expression as much as possible, so as to obtain the linear parameter with high accuracy on the basis of no external equipment.
According to the linear parameter obtaining method of the audio playing device, the first transfer function represented by the electroacoustic equivalent circuit of the audio playing device is obtained, the impedance curve of the audio playing device in the audio playing process is obtained, and the first impedance relation corresponding to the impedance curve is used for constructing the error function according to the first transfer function and the first impedance relation, so that the accuracy of the obtained linear parameter can be ensured, the corresponding linear parameter obtaining process does not need to use external equipment, and the cost in the linear parameter obtaining process is reduced.
In one embodiment, corresponding to step S110 shown in fig. 1, the obtaining the first transfer function of the equivalent circuit representation of the audio playing device includes:
acquiring an electroacoustic equivalent circuit of the audio playing device;
the first transfer function is constructed from the electroacoustic equivalent circuit.
Optionally, in this embodiment, by analyzing blocking characteristics of various signals such as an electrical signal and a power signal in the working process of the audio playing device, a corresponding input-output relationship is determined according to the blocking characteristics of various signals, and a corresponding path is determined according to the input-output relationship of various signals, so as to determine an electroacoustic equivalent circuit; analyzing the input-output relation included in the electroacoustic equivalent circuit to obtain a corresponding first transfer function; it can be seen that the present embodiment can accurately acquire the first transfer function of the audio playing device.
In one example, referring to fig. 2, the electroacoustic equivalent circuit includes: an electromotive force equivalent component Bl, a first path 210 connected to one side of the electromotive force equivalent component Bl, and a second path 220 connected to the other side of the electromotive force equivalent component Bl. The electromotive force equivalent component Bl is used for representing the induced electromotive force generated by the motion of the coil with the effective length l in the magnetic field of the field intensity B; in particular, the electromotive force equivalent component Bl can characterize an induced electromotive force generated by movement of a coil of effective length l in a magnetic field of field strength B, the induced electromotive force being Bl x v, where v is a vibration velocity of the coil. The first passage is used for representing the electric signal blocking characteristic of the audio playing device, namely the electrical impedance characteristic of a voice coil in the audio playing device. The second path is used for representing the power signal blocking characteristic of the audio playing device, namely the dynamic impedance characteristic of a sound generating unit (such as a loudspeaker unit) in the audio playing device.
Specifically, as shown in fig. 2, the first path 210 includes a voltage source U, a first equivalent resistor R, a first equivalent inductance L, and an eddy current assembly connected in series; as shown in fig. 2, one end of the voltage source U is connected to the electromotive force equivalent component, the other end is connected to the first equivalent resistor R, one end of the eddy current effect component is connected to the first equivalent inductor L, and the other end is connected to the electromotive force equivalent component, so that the corresponding structure in the first path 210 is accurately connected to the electromotive force equivalent component; the eddy-current effect assembly comprises a second equivalent inductance L2 and a second equivalent resistance R2 which are connected in parallel, wherein the second equivalent inductance L2 and the second equivalent resistance R2 are equivalent by the horn eddy-current effect of the audio playing device at high frequency (such as the frequency is higher than a certain frequency threshold value and the like). Optionally, the first equivalent resistor R comprises a direct current resistor of the audio playing device. Optionally, the first equivalent inductance L comprises an equivalent inductance of the audio playing device.
Specifically, as shown in fig. 2, the second path 220 includes an equivalent capacitance c, a coil mass equivalent m, and a mechanical damping equivalent r in series; as shown in fig. 2, one end of the equivalent capacitor c is connected to the electromotive force equivalent component, the other end is connected to the coil mass equivalent m, and one end of the mechanical damping equivalent r is connected to the coil mass equivalent m, and the other end is connected to the electromotive force equivalent component, so that the corresponding structure in the first path 220 is accurately connected to the electromotive force equivalent component. Optionally, the coil quality equivalent m characterizes a coil quality of the audio playback device. Optionally, the mechanical damping equivalent r characterizes the mechanical damping of the audio playback device.
The corresponding transfer functions may be obtained here from the individual paths of the electroacoustic equivalent circuit, such as the first path 210 and the second path 220. For example, the electrical signal blocking features corresponding to the first via 210 include: z is Z EB (s)＝R e +s*L e The electrical signal blocking features corresponding to the second path 220 include:
accordingly, the first transfer function includes:
wherein R is e Representing the first equivalent resistance, L e Represents a first equivalent inductance, bl represents an induced electromotive force generated by the electromotive force equivalent component, M ms Representing the mass of each component involved in vibration during the operation of the audio playing device, R ms Representing the mechanical damping of the audio playback device, C ms Representing the compliance of the vibration support part of the audio playing device, s representing s-domain variables, symbol representing multiplication, Z E (s) represents a first transfer function; z is Z EB (s) represents the electrical impedance characteristics of the sound generating unit, Z EM (s) represents the dynamic impedance characteristics of the sound generating unit.
Optionally, a first transfer function Z E First equivalent resistance R in(s) e First equivalent inductance L e Coil induction parameter Bl, mass M of each component involved in vibration ms Mechanical damping R ms And flexibility C ms The parameters can be determined according to the parameter configuration characteristics of the audio playing device, real-time measurement and the like, multiple parameter debugging and the like, and the first transfer function Z is after the parameters are determined E (s) the input-output relationship of the corresponding audio playing device can be more accurately characterized.
In one embodiment, corresponding to step S120 shown in fig. 1, the obtaining an impedance curve of the audio playing device during audio playing includes: when the audio playing device plays audio, respectively monitoring the working voltage and the working current of the audio playing device; acquiring first envelope data corresponding to the working voltage (also called voltage data) and second envelope data corresponding to the working current (also called current data); an impedance curve is determined from the first envelope data and the second envelope data. According to the embodiment, through the frequency sweeping sound source, working voltage and working current at two ends of the audio playing device (such as a loudspeaker) can be captured, so that first envelope data corresponding to the working voltage and second envelope data corresponding to the working current are obtained; the first envelope data and the second envelope data are divided to obtain impedance change related data, and a relation between corresponding frequency and impedance change is established according to a frequency sweep mode, so that an impedance curve is determined, the impedance curve can be accurately obtained, calculated amount caused by obtaining the impedance curve through FFT (fast Fourier transform) and other transformation modes can be reduced, and the obtaining process of the impedance curve can be simplified.
In one embodiment, corresponding to step S140 shown in fig. 1, said constructing an error function from said first transfer function and said first impedance relation comprises:
acquiring initial parameters of the impedance curve characterization, wherein the initial parameters can be acquired according to the impedance curve by adopting a mapping method and the like;
substituting the initial parameters into the first transfer function to quickly and accurately determine a first equivalent resistance R of the first transfer function e First equivalent inductance L e Coil induction parameter Bl, mass M of each component involved in vibration ms Mechanical damping R ms And flexibility C ms Equal parameters, obtaining a second impedance relational expression;
and constructing an error function according to the second impedance relational expression and the first impedance relational expression.
According to the method and the device for determining the corresponding parameters in the first transfer function according to the initial parameters of the impedance curve characterization, the determining process of the corresponding parameters can be simplified, the determining efficiency of the corresponding second impedance relational expression is improved, and therefore the obtaining efficiency of the linear parameters is improved.
In one example, obtaining initial parameters of the impedance curve characterization includes: and identifying an upper frequency limit and a lower frequency limit on the impedance curve, and acquiring the initial parameters according to the upper frequency limit and the lower frequency limit. Specifically, acquiring the initial parameter according to the upper frequency limit and the lower frequency limit may include: and obtaining relational expressions between the upper frequency limit and the lower frequency limit and the parameters respectively, and substituting the upper frequency limit and the lower frequency limit into the corresponding relational expressions to calculate and obtain the initial parameters.
Specifically, the impedance curve may be shown in fig. 3, where the upper limit frequency is f1, the lower limit frequency is f2, and the impedance values corresponding to the upper limit frequency f1 and the lower limit frequency f2 are Z r The central frequency f0 between the upper limit frequency f1 and the lower limit frequency f2, the maximum impedance value corresponding to the impedance curve is Z max Z obtained from impedance curves r The relation between the upper limit frequency f1 and the lower limit frequency f2 can be written as:the relation between the upper frequency limit and the lower frequency limit thus determined and the respective parameters may include: /> Wherein R is e Represents a first equivalent resistance, Q MS Representing the mechanical quality factor, Q, of an audio playback device ES Represents the electrical quality factor of the audio playing device, bl represents the induced electromotive force generated by the electromotive force equivalent component, M ms Representing the mass of each component involved in vibration during the operation of the audio playing device, i.e. the sum of the masses of each component involved in vibration during the movement of the audio playing device such as loudspeaker, e.g. drum paper, voice coil, etc., R ms Representing the mechanical damping of an audio playback device, C ms Representing compliance, w, of vibration support components of an audio playback device s Representing the resonant angular frequency of the audio playback device.
After the upper frequency limit and the lower frequency limit are known, according to the above relation, the corresponding linear parameter can be obtained by calculation, and the initial value of the linear parameter can be accurately and rapidly determined, so as to obtain the initial parameter. The initial parameters are substituted into the first transfer function, so that the corresponding parameters in the first transfer function can be rapidly and accurately determined, and the second impedance relational expression is obtained.
In one example, the constructing an error function from the second impedance relationship and the first impedance relationship includes: and determining root mean square error between the second impedance relational expression and the first impedance relational expression as the error function so as to improve the stability of the error function. Alternatively, if ε represents the error function, Z E (s i ) Represents a second impedance relationship, Z E,MEAS (s i ) Representing the first impedance relation, i representing the sequence number of the sampling instant, the error function epsilon may comprise:
the inventor finds that in the research process, some linear parameter acquisition schemes establish a related measurement function model through a data fitting mode to perform parameter identification, for example, a speaker impedance parameter model is adopted to measure a related impedance value, a displacement parameter model is adopted to measure a related displacement value, and the like, wherein the adopted function model often comprises a non-convex function, and the special situation that a local minimum value is possibly encountered in the identification process is easy to cause inaccuracy of an acquired parameter result.
In view of the above, in one embodiment, corresponding to step S150 shown in fig. 1, the calculating the linearity parameters of the audio playing device according to the error function includes: constructing constraint conditions according to the value ranges of the linear parameters of the audio playing equipment; and calculating a parameter value which enables the error function to be at a minimum value based on the constraint condition, and obtaining a linear parameter to be obtained. In this embodiment, the parameter value that makes the error function take the minimum value is calculated based on the constraint condition, so that the problem of parameter non-convergence caused by the sinking of the local minimum value can be avoided, the linear parameter can be accurately obtained in various situations, and the stability of the linear parameter obtaining process can be improved.
In one example, the constraint may include a condition such as a range of values corresponding to the linear parameter. Specifically, the present embodiment may list various linear parameters related to the error function, for example, store these linear parameters into an array Plim, where plim= [ R e ，Bl，M ms ，K ms ，R ms ，L e ]And determining the upper and lower boundaries of each element in the array Plim according to the configuration characteristics and/or performance characteristics of the audio playing equipment and other factors to obtain the value range of each linear parameter, constructing corresponding constraint conditions, and ensuring the accuracy of the constraint conditions.
In one example, the inventor performs simulation analysis on the linear parameter obtaining method of the audio playing device, and fig. 4 is a comparison of effects of an actually measured impedance frequency response curve and a predicted impedance frequency response curve, and the graph shows that the linear parameter obtaining method provided by the application can quickly find a group of linear parameters so that the fitting effect of the impedance curve is better. Therefore, the linear parameter acquisition method provided by the application is high in speed, high in accuracy and good in comprehensive performance.
According to the linear parameter obtaining method of the audio playing device, the first transfer function represented by the electroacoustic equivalent circuit of the audio playing device is obtained, the impedance curve of the audio playing device in the audio playing process is obtained, and the first impedance relation corresponding to the impedance curve is used for constructing an error function according to the first transfer function and the first impedance relation, so that the accuracy of the obtained linear parameter can be ensured by calculating the linear parameter of the audio playing device according to the error function, and the corresponding linear parameter obtaining process does not need to use external equipment, so that the cost in the linear parameter obtaining process is reduced; the linear parameter which enables the error function to take the minimum value is calculated based on the constraint condition, so that the problem of parameter non-convergence caused by the fact that the error function falls into the local minimum value can be avoided, and the stability of the linear parameter obtaining process is improved.
The present application provides, in a second aspect, a linear parameter acquiring system of an audio playing device, with reference to fig. 5, where the linear parameter acquiring system includes:
a first obtaining module 110, configured to obtain a first transfer function of an electroacoustic equivalent circuit representation of an audio playing device;
a second obtaining module 120, configured to obtain an impedance curve of the audio playing device during the audio playing process;
a third obtaining module 130, configured to obtain a functional relationship corresponding to the impedance curve, so as to obtain a first impedance relational expression;
a construction module 140, configured to construct an error function according to the first transfer function and the first impedance relation;
a calculating module 150, configured to calculate a linear parameter of the audio playing device according to the error function.
For specific limitations regarding the linear parameter acquisition system of the audio playback apparatus, reference may be made to the above limitations regarding the linear parameter acquisition method of the audio playback apparatus, and no further description is given here. The above-mentioned various modules in the linear parameter acquisition system of the audio playback apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or independent of the operation module in the computer device, or may be stored in software in a memory of the computer device, so that the operation module may call and execute operations corresponding to the above modules.
The present application provides in a third aspect an audio playback device, as shown with reference to fig. 6, comprising a processor 610 and a storage medium 620; the storage medium 620 has program code stored thereon; the processor 610 is configured to invoke the program code stored in the storage medium 620 to execute the linear parameter acquiring method of the audio playing device according to any of the foregoing embodiments.
The audio playing device may include independent audio playing devices such as a speaker and a sound device, may also include an audio playing module such as a micro speaker and the like arranged on other electronic devices, and may also include electronic devices such as a mobile phone and a tablet computer having an audio playing module. Optionally, the audio playback device may further comprise a voice coil circuit and/or associated coils for audio playback.
The audio playing device provided by the application can accurately acquire the linear parameters under various conditions, and the stability of the linear parameter acquisition process can be improved.
Although the application has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. This application is intended to cover all such modifications and variations, and is limited only by the scope of the appended claims. In particular regard to the various functions performed by the above described components, the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the specification.
That is, the foregoing embodiments are merely examples of the present application, and are not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application, such as the combination of technical features of the embodiments, or direct or indirect application to other related technical fields, are included in the scope of the patent protection of the present application.
In addition, the terms "first" and "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features such as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The previous description is provided to enable any person skilled in the art to make or use the present application. In the above description, various details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known processes have not been described in detail in order to avoid unnecessarily obscuring the description of the present application. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Claims (12)

1. A linear parameter acquisition method for an audio playback apparatus, the linear parameter acquisition method comprising:
acquiring a first transfer function of electroacoustic equivalent circuit characterization of audio playing equipment;
acquiring an impedance curve of the audio playing device in the audio playing process;
obtaining a functional relation corresponding to the impedance curve to obtain a first impedance relation;
constructing an error function according to the first transfer function and the first impedance relation;
and calculating the linear parameter of the audio playing device according to the error function.
2. The method of claim 1, wherein the obtaining a first transfer function of an equivalent circuit representation of the audio playback device comprises:
acquiring an electroacoustic equivalent circuit of the audio playing device;
the first transfer function is constructed from the electroacoustic equivalent circuit.
3. The method of linear parameter acquisition for an audio playback apparatus according to claim 2, wherein the electroacoustic equivalent circuit comprises: the device comprises an electromotive force equivalent component, a first passage connected to one side of the electromotive force equivalent component and a second passage connected to the other side of the electromotive force equivalent component, wherein the electromotive force equivalent component is used for representing induced electromotive force generated by movement of a coil with an effective length l in a magnetic field of field intensity B, the first passage is used for representing electric signal blocking characteristics of audio playing equipment, and the second passage is used for representing power signal blocking characteristics of the audio playing equipment.
4. The method for obtaining linear parameters of audio playing device according to claim 3, wherein the first path comprises a voltage source, a first equivalent resistor, a first equivalent inductance and an eddy current effect component connected in series, one end of the voltage source is connected with the electromotive force equivalent component, the other end is connected with the first equivalent resistor, one end of the eddy current effect component is connected with the first equivalent inductance, and the other end is connected with the electromotive force equivalent component; the second path comprises an equivalent capacitor, a coil mass equivalent piece and a mechanical damping equivalent piece which are connected in series, one end of the equivalent capacitor is connected with the electromotive force equivalent component, the other end of the equivalent capacitor is connected with the coil mass equivalent piece, one end of the mechanical damping equivalent piece is connected with the coil mass equivalent piece, and the other end of the mechanical damping equivalent piece is connected with the electromotive force equivalent component; the eddy current effect assembly comprises a second equivalent inductance and a second equivalent resistance which are connected in parallel, wherein the second equivalent inductance and the second equivalent resistance are equivalent by the loudspeaker eddy current effect of the audio playing device at high frequency.
5. The method of claim 4, wherein the first transfer function comprises:
wherein R is e Representing the first equivalent resistance, L e Represents a first equivalent inductance, bl represents an induced electromotive force generated by the electromotive force equivalent component, M ms Representing the mass of each component involved in vibration during the operation of the audio playing device, R ms Representing the mechanical damping of the audio playback device, C ms Representing the compliance of the vibration support part of the audio playing device, s representing s-domain variables, symbol representing multiplication, Z E (s) represents a first transfer function.
6. The method for obtaining the linear parameter of the audio playing device according to claim 1, wherein obtaining the impedance curve of the audio playing device during the audio playing process comprises:
when the audio playing device plays audio, respectively monitoring the working voltage and the working current of the audio playing device;
acquiring first envelope data corresponding to the working voltage and second envelope data corresponding to the working current;
an impedance curve is determined from the first envelope data and the second envelope data.
7. The method of claim 1, wherein constructing an error function from the first transfer function and the first impedance relation comprises:
acquiring initial parameters of the impedance curve characterization;
substituting the initial parameters into the first transfer function to obtain a second impedance relational expression;
and constructing an error function according to the second impedance relational expression and the first impedance relational expression.
8. The method of claim 7, wherein obtaining initial parameters of the impedance profile characterization comprises:
and identifying an upper frequency limit and a lower frequency limit on the impedance curve, and acquiring the initial parameters according to the upper frequency limit and the lower frequency limit.
9. The method of claim 7, wherein constructing an error function from the second impedance relation and the first impedance relation comprises:
a root mean square error between the second impedance relationship and the first impedance relationship is determined as the error function.
10. The method of claim 1, wherein the calculating the linear parameter of the audio playback device according to the error function comprises:
constructing constraint conditions according to the value ranges of the linear parameters of the audio playing equipment;
and calculating a parameter value which enables the error function to take the minimum value based on the constraint condition, and obtaining the linear parameter.
11. A linear parameter acquisition system for an audio playback device, comprising:
the first acquisition module is used for acquiring a first transfer function of the electroacoustic equivalent circuit representation of the audio playing device;
the second acquisition module is used for acquiring an impedance curve of the audio playing device in the audio playing process;
the third acquisition module is used for acquiring a functional relation corresponding to the impedance curve to obtain a first impedance relation;
a construction module for constructing an error function from the first transfer function and the first impedance relation;
and the calculating module is used for calculating the linear parameter of the audio playing device according to the error function.
12. An audio playback device comprising a processor and a storage medium; the storage medium has program code stored thereon; the processor is configured to invoke the program code stored in the storage medium to perform the linear parameter acquisition method of the audio playback apparatus according to any one of claims 1 to 10.
CN202210764147.2A 2022-06-29 2022-06-29 Linear parameter acquisition method and system of audio playing device and audio playing device Pending CN117376802A (en)

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