Micro speaker driving system, method and micro speaker

Abstract

The present application provides a driving system, method and micro-speaker of a micro-speaker, and relates to the field of signal processing technology. The driving system includes: a driving modulation module and an ultrasonic transducer module; the output end of the driving modulation module is connected to the input end of the ultrasonic transducer module; the driving modulation module is used to obtain the low-frequency signal to be processed, and modulate the low-frequency signal to generate a modulated high-frequency signal, and transmit the modulated high-frequency signal to the ultrasonic transducer module; the ultrasonic transducer module is used to obtain an audible frequency signal, and generate resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal. The driving system proposed in the present application has the advantages of simple structure, small size, strong driving ability, easy implementation and low power consumption, etc., which can realize miniaturized application and solve the problems existing in the use of electromagnetic drive in related technologies.

Description

Technical Field

[0001] The present invention relates to the field of signal processing technology, and in particular to a micro-speaker driving system, method and micro-speaker. Background Art

[0002] A micro speaker is a miniaturized and highly integrated speaker that is widely used in various portable electronic devices, such as smartphones, tablets, smart watches, True Wireless Stereo (TWS), etc.

[0003] In the prior art, the driving mechanism adopted by most micro speakers includes: electromagnetic driving. Specifically, electromagnetic driving uses the principle of electromagnetic induction to generate force through the action of electric current in a magnetic field, which drives the speaker diaphragm to vibrate, thereby generating sound.

[0004] However, electromagnetic drive requires a large space to accommodate coils and magnets, which is not suitable for miniaturized applications. At the same time, electromagnetic drive has high power consumption. Summary of the invention

[0005] The purpose of the present invention is to provide a micro-speaker driving system, method and micro-speaker in view of the above-mentioned deficiencies in the prior art, so as to solve the technical problems existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0007] In a first aspect, an embodiment of the present application provides a driving system for a micro speaker, the driving system comprising: a driving modulation module and an ultrasonic transducer module;

[0008] The output end of the driving modulation module is connected to the input end of the ultrasonic transducer module;

[0009] The driving modulation module is used to obtain the low-frequency signal to be processed, modulate the low-frequency signal to generate a modulated high-frequency signal, and transmit the modulated high-frequency signal to the ultrasonic transducer module, wherein the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module;

[0010] The ultrasonic transducer module is used to obtain an audible frequency signal and generate resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal.

[0011] Optionally, the driving modulation module is specifically used to:

[0012] Acquire a pre-generated carrier signal, wherein the carrier signal is a square wave high-frequency signal, and the frequency of the carrier signal is the resonant frequency of the ultrasonic transducer module;

[0013] The low-frequency signal is frequency modulated using the carrier signal to generate a modulated high-frequency signal.

[0014] Optionally, the frequency band of the modulated high-frequency signal is determined by the voltage amplitude of the low-frequency signal.

[0015] Optionally, the ultrasonic transducer module is specifically used for:

[0016] Resonance is generated under the driving of the modulated high-frequency signal, and the frequency response of the audible frequency signal is increased according to the amplitude of the modulated high-frequency signal to generate an audible frequency signal with increased frequency response.

[0017] Optionally, it also includes: a signal amplification module;

[0018] The input end of the signal amplification module is connected to the output end of the drive modulation module, and the output end of the signal amplification module is connected to the input end of the ultrasonic transducer module;

[0019] The signal amplification module is used to amplify the modulated high-frequency signal to generate an amplified high-frequency signal, and transmit the amplified high-frequency signal to the ultrasonic transducer module.

[0020] Optionally, it further comprises: a signal generating module; the output end of the signal generating module is connected to the input end of the driving modulation module;

[0021] The signal generating module is used to generate a low-frequency signal and transmit the low-frequency signal to the driving modulation module.

[0022] In a second aspect, an embodiment of the present application further provides a driving method for a micro-speaker, which is applied to the driving system provided in the first aspect above, and the method comprises:

[0023] The driving modulation module acquires a low-frequency signal to be processed, modulates the low-frequency signal to generate a modulated high-frequency signal, and transmits the modulated high-frequency signal to the ultrasonic transducer module, wherein the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module;

[0024] The ultrasonic transducer module acquires an audible frequency signal and generates resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal.

[0025] Optionally, the driving modulation module modulates the low-frequency signal to generate a modulated high-frequency signal, including:

[0026] Acquire a pre-generated carrier signal, wherein the carrier signal is a square wave high-frequency signal, and the frequency of the carrier signal is the resonant frequency of the ultrasonic transducer module;

[0027] The low-frequency signal is frequency modulated using the carrier signal to generate a modulated high-frequency signal.

[0028] Optionally, the ultrasonic transducer module generates resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal, including:

[0029] Resonance is generated under the driving of the modulated high-frequency signal, and the frequency response of the audible frequency signal is increased according to the amplitude of the modulated high-frequency signal to generate an audible frequency signal with increased frequency response.

[0030] In a third aspect, an embodiment of the present application further provides a micro speaker, comprising: a micro speaker body and the driving system provided in the first aspect, wherein the driving system is disposed inside the micro speaker body.

[0031] The beneficial effects of this application are:

[0032] The present application provides a driving system, method and micro-speaker of a micro-speaker, wherein the driving system includes: a driving modulation module and an ultrasonic transducer module; the output end of the driving modulation module is connected to the input end of the ultrasonic transducer module; the driving modulation module is used to obtain the low-frequency signal to be processed, and modulate the low-frequency signal to generate a modulated high-frequency signal, and transmit the modulated high-frequency signal to the ultrasonic transducer module, wherein the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module; the ultrasonic transducer module is used to obtain an audible frequency signal, and generate resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal. The driving system proposed in the present application drives the low-frequency acoustic domain to vibrate through an ultrasonic resonant structure, generates a larger amplitude to push a larger amount of air, and then generates a larger sound at a low frequency; that is, the driving system proposed in the present application has the advantages of simple structure, small size, strong driving ability, easy implementation and low power consumption, and can realize miniaturized application, solving the problems existing in the use of electromagnetic drive in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1A schematic diagram of the structural flow of a micro-speaker driving system provided in an embodiment of the present application;

[0035] Figure 2 The carrier signal provided in the embodiment of the present application is a schematic diagram of a square wave high frequency signal;

[0036] Figure 3 A schematic diagram of the structural flow of another micro-speaker driving system provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of a process flow of a micro-speaker driving method provided in the present application;

[0038] Figure 5 A schematic structural diagram of a micro speaker provided in an embodiment of the present application.

[0039] Icon: 100-driving system; 1-driving modulation module; 2-ultrasonic transducer module; 3-signal amplification module; 4-signal generation module; 200-micro speaker. DETAILED DESCRIPTION

[0040] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of order, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0041] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0042] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0043] First of all, before introducing the present application, the background technology involved in the present application is introduced.

[0044] In the related art, the driving mechanisms adopted by most micro speakers include: electromagnetic driving and piezoelectric driving. Among them, electromagnetic driving uses the principle of electromagnetic induction to generate force through the action of current in a magnetic field, which drives the speaker diaphragm to vibrate, thereby generating sound.

[0045] However, electromagnetic drive requires a large space to accommodate coils and magnets, which limits its miniaturized application in extremely small devices. At the same time, electromagnetic drive has high power consumption.

[0046] The implementation principle of the structure of the driving system of the micro-speaker provided in the present application and the corresponding beneficial effects will be explained through multiple specific embodiments as follows.

[0047] Optionally, refer to Figure 1 As shown, the driving system of the micro speaker provided in the present application is shown. The driving system 100 includes: a driving modulation module 1 and an ultrasonic transducer module 2 .

[0048] Exemplarily, the drive modulation module 1 may be a modulation circuit or a drive processor. Both the modulation circuit and the drive processor have a signal modulation function, which can modulate the input low-frequency signal into a high-frequency signal and input the modulated high-frequency signal to the ultrasonic transducer module 2.

[0049] The ultrasonic transducer module 2 may be a high-frequency ultrasonic transducer. A high-frequency ultrasonic transducer is an ultrasonic transducer with a resonant frequency exceeding 20 kHz acoustically. Exemplarily, the high-frequency ultrasonic transducer is not limited to any type, including capacitive, electromagnetic, piezoelectric and other technical types. A high-frequency ultrasonic transducer has a resonant characteristic in a certain frequency band and can generate a large amplitude response at a specific frequency point.

[0050] Continue to refer Figure 1 As shown, the output end of the driving modulation module 1 is connected to the input end of the ultrasonic transducer module 2 .

[0051] The driving modulation module 1 is used to obtain the low-frequency signal to be processed, modulate the low-frequency signal, generate a modulated high-frequency signal, and transmit the modulated high-frequency signal to the ultrasonic transducer module 2. The frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module.

[0052] Exemplarily, the resonant frequency of the ultrasonic transducer module is 170 kHz, that is, at this resonant frequency, the ultrasonic transducer module 2 can generate a relatively large amplitude.

[0053] The ultrasonic transducer module 2 is used to obtain an audible frequency signal and generate resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal. The audible frequency signal refers to an electrical signal or mechanical vibration within the sound wave frequency range that can be perceived by the human ear. For example, the audible frequency signal is 13 kHz.

[0054] In this embodiment, a low-frequency signal is connected to the input end of the driving modulation module 1. For example, the frequency of the low-frequency signal is 50 khz. The low-frequency signal is modulated by the driving modulation module 1 to generate a modulated high-frequency signal, and the modulated high-frequency signal is input to the ultrasonic transducer module 2. Since the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module, that is, the ultrasonic transducer module 2 can generate a larger amplitude under the drive of the modulated high-frequency signal, and the audible frequency signal is driven by this amplitude, thereby achieving the effect of enhancing the frequency response of the audible frequency signal.

[0055] Therefore, the driving system proposed in the present application drives the low-frequency acoustic domain to vibrate through the ultrasonic resonance structure, generating a larger amplitude to push more air and thus produce a louder sound at a low frequency; that is, the driving system proposed in the present application has the advantages of simple structure, small size, strong driving ability, easy implementation and low power consumption, and can realize miniaturized application, solving the problems existing in the use of electromagnetic drive in related technologies.

[0056] In summary, the embodiment of the present application provides a driving system for a micro speaker, and the driving system includes: a driving modulation module and an ultrasonic transducer module; the output end of the driving modulation module is connected to the input end of the ultrasonic transducer module; the driving modulation module is used to obtain the low-frequency signal to be processed, and modulate the low-frequency signal to generate a modulated high-frequency signal, and transmit the modulated high-frequency signal to the ultrasonic transducer module, and the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module; the ultrasonic transducer module is used to obtain an audible frequency signal, and generate resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal. The driving system proposed in the present application drives the low-frequency acoustic domain to vibrate through an ultrasonic resonant structure, generates a larger amplitude to push a larger amount of air, and then produces a larger sound at a low frequency; that is, the driving system proposed in the present application has the advantages of simple structure, small size, strong driving ability, easy implementation and low power consumption, and can realize miniaturized application, solving the problems existing in the use of electromagnetic drive in related technologies.

[0057] Optionally, the driving modulation module 1 is specifically used for:

[0058] Acquire a pre-generated carrier signal, wherein the carrier signal is a square wave high-frequency signal, and the frequency of the carrier signal is the resonant frequency of the ultrasonic transducer module;

[0059] The low-frequency signal is frequency modulated using a carrier signal to generate a modulated high-frequency signal.

[0060] Exemplarily, an oscillator circuit may be used to generate a square wave high frequency signal, such as an RC oscillator, an LC oscillator, a crystal oscillator, or a square wave resonator, etc. Alternatively, a digital logic circuit (such as a trigger, a counter, etc.) may be used to generate a square wave high frequency signal.

[0061] For example, refer to Figure 2 As shown, the waveform of the square wave high frequency signal is rectangular, and the frequency is the resonant frequency of the ultrasonic transducer module.

[0062] In this embodiment, the input end of the driving modulation module 1 can be connected to the output end of the oscillator, and the square wave high-frequency signal generated by the oscillator is input into the driving modulation module 1. The driving modulation module 1 uses the square wave high-frequency signal to frequency modulate the low-frequency signal to generate a modulated high-frequency signal, so that the instantaneous frequency offset of the low-frequency signal changes proportionally with the modulation signal, that is, the frequency of the adjusted high-frequency signal is equal to the frequency of the square wave high-frequency signal.

[0063] Exemplarily, the driving modulation module 1 may use the modulation formula shown below to perform frequency modulation on the low-frequency signal, specifically as follows:

[0064] S FM (t) = Acos[wt+K f ∫m(t)dt] (1)

[0065] K in Formula 1 f is the frequency modulation sensitivity, the unit is rad / s·V. Assume that the square wave high frequency signal is a single frequency sine wave, that is, m(t) = A m cosw m t=A m cos2∏f m t.

[0066] Therefore, the modulated high-frequency signal can be obtained as shown in the following formula 2:

[0067]

[0068] in,

[0069] Optionally, the frequency band of the modulated high-frequency signal is determined by the voltage amplitude of the low-frequency signal.

[0070] In this embodiment, in the process of modulating the low-frequency signal, the frequency band (also called the density) of the modulated high-frequency signal is determined by the voltage amplitude of the low-frequency signal. The smaller the voltage amplitude of the low-frequency signal, the wider the frequency band of the modulated high-frequency signal. For example, when the voltage amplitude of the low-frequency signal is 0.1, the frequency band of the modulated high-frequency signal is 0.98fc-fc; when the voltage amplitude of the low-frequency signal is 20, the frequency band of the modulated high-frequency signal is 0.1fc-fc.

[0071] When the voltage amplitude of the low-frequency signal is the largest, the modulated high-frequency signal is denser; when the voltage amplitude of the low-frequency signal is the lowest, the modulated high-frequency signal is sparser.

[0072] Therefore, the low frequency determines the period of the density transformation of the modulated high frequency signal. The higher the frequency of the low frequency signal, the faster the density transformation of the modulated high frequency signal; the lower the frequency of the low frequency signal, the slower the density transformation of the modulated high frequency signal.

[0073] Optionally, the ultrasonic transducer module 2 is specifically used for:

[0074] Resonance is generated under the drive of the modulated high-frequency signal, and the frequency response of the audible frequency signal is increased according to the amplitude of the modulated high-frequency signal, thereby generating an audible frequency signal with increased frequency response.

[0075] In this embodiment, for example, the audible frequency signal is a sound signal of 20 kHz. In order to realize the driving of the received audible frequency signal, the same frequency resonance can be generated under the driving of the modulated high-frequency signal. At this time, the amplitude of the modulated high-frequency signal is the maximum amplitude; then, the audible frequency signal of 5 kHz is driven by the maximum amplitude to increase the frequency response of the audible frequency signal, thereby generating an audible frequency signal with increased frequency response, thereby improving the loudness of the audible frequency signal, and realizing the maximum amplitude generated by the ultrasonic transducer module under the same frequency resonance to drive the vibration of the audible frequency, thereby achieving the effect of enhancing the frequency response of the audible frequency signal.

[0076] Optionally, refer to Figure 3 As shown, the driving system further includes: a signal amplification module 3.

[0077] The input end of the signal amplifying module 3 is connected to the output end of the driving modulation module 1, and the output end of the signal amplifying module 3 is connected to the input end of the ultrasonic transducer module 2. Exemplarily, the signal amplifying module 3 may be a signal amplifying circuit.

[0078] The signal amplification module 3 is used to amplify the modulated high-frequency signal to generate an amplified high-frequency signal, and transmit the amplified high-frequency signal to the ultrasonic transducer module.

[0079] In this embodiment, the signal amplification module 3 amplifies the modulated high-frequency signal from the driving modulation module 1, that is, increases the voltage gain, current gain or power gain of the modulated high-frequency signal, and transmits the amplified high-frequency signal to the ultrasonic transducer module.

[0080] Optionally, continue to refer to Figure 3 As shown, it also includes: a signal generating module 4. Exemplarily, the signal generating module 4 can be a signal generator, such as a function generator, which can generate low-frequency signals such as sine waves, square waves, sawtooth waves, etc.

[0081] The output end of the signal generating module 4 is connected to the input end of the driving modulation module 1 .

[0082] The signal generating module 4 is used to generate a low-frequency signal and transmit the low-frequency signal to the driving modulation module 1 .

[0083] In this embodiment, a low-frequency signal, such as 50 khz, can be generated by the signal generating module 4, and then the low-frequency signal is transmitted to the driving modulation module 1, which performs frequency modulation on the low-frequency signal to generate a modulated high-frequency signal.

[0084] Among them, the voltage amplitude of the low-frequency signal is mainly used to adjust the duty cycle of the high-frequency square wave signal, and the frequency of the low-frequency signal is mainly used to control the frequency of the output sound signal.

[0085] In summary, the driving system of the micro-speaker provided in the present application does not require too many devices to achieve the effect of enhancing the frequency response of audible frequency signals. It has the advantages of simple structure, small size, strong driving ability, easy implementation and low power consumption. It can realize miniaturized applications and solves the problems existing in the use of electromagnetic drive in related technologies.

[0086] The driving method applied to the above-mentioned driving system will be explained in detail through the following embodiments.

[0087] Optionally, refer to Figure 4 FIG. 1 is a flow chart of a driving method of a micro-speaker provided in the present application, which is applied to the driving system provided in the above embodiment. The method includes:

[0088] S401, the driving modulation module obtains the low-frequency signal to be processed, modulates the low-frequency signal to generate a modulated high-frequency signal, and transmits the modulated high-frequency signal to the ultrasonic transducer module, wherein the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module.

[0089] S402: The ultrasonic transducer module acquires an audible frequency signal, and generates resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal.

[0090] In this solution, the driving modulation module performs frequency modulation on the received low-frequency signal to generate a modulated high-frequency signal, and transmits the modulated high-frequency signal to the ultrasonic transducer module, where the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module; the modulated high-frequency signal is transmitted to the ultrasonic transducer, and the ultrasonic transducer module can generate a larger amplitude under the drive of the modulated high-frequency signal, and the audible frequency signal is driven by this amplitude, thereby achieving the effect of enhancing the frequency response of the audible frequency signal.

[0091] Therefore, the driving system proposed in the present application drives the low-frequency acoustic domain to vibrate through the ultrasonic resonance structure, generating a larger amplitude to push more air and thus produce a louder sound at a low frequency; that is, the driving system proposed in the present application has the advantages of simple structure, small size, strong driving ability, easy implementation and low power consumption, and can realize miniaturized application, solving the problems existing in the use of electromagnetic drive in related technologies.

[0092] Optionally, in the above step S401, the driving modulation module modulates the low-frequency signal to generate a modulated high-frequency signal, including:

[0093] A pre-generated carrier signal is obtained, wherein the carrier signal is a square wave high-frequency signal, and the frequency of the carrier signal is the resonant frequency of the ultrasonic transducer module; the low-frequency signal is frequency modulated using the carrier signal to generate a modulated high-frequency signal.

[0094] Exemplarily, the modulated high-frequency signal is a 170 kHz high-frequency resonant frequency signal.

[0095] Optionally, the ultrasonic transducer module generates resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal, including:

[0096] Resonance is generated under the drive of the modulated high-frequency signal, and the frequency response of the audible frequency signal is increased according to the amplitude of the modulated high-frequency signal, thereby generating an audible frequency signal with increased frequency response.

[0097] Therefore, the audible frequency signal is driven to vibrate through resonance, thereby generating an audible frequency signal with an increased frequency response, that is, generating a larger acoustic frequency response.

[0098] Optionally, refer to Figure 5 As shown, the present application also provides a schematic structural diagram of a micro speaker, the micro speaker 200 includes: a micro speaker body and a driving system provided in the above embodiment, and the driving system is arranged inside the micro speaker body.

[0099] Optionally, the micro speaker of the present application has the advantages of simple structure, small size, easy implementation and low power consumption, and can be applied in miniaturization, thus solving the problems existing in the electromagnetic drive used in the related art.

[0100] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0103] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated: ROM), random access memory (English: Random Access Memory, abbreviated: RAM), disk or optical disk and other media that can store program codes.

Claims

1. A micro speaker driving system, characterized in that: The driving system comprises: a driving modulation module and an ultrasonic transducer module; The output end of the driving modulation module is connected to the input end of the ultrasonic transducer module; The driving modulation module is used to obtain the low-frequency signal to be processed, modulate the low-frequency signal to generate a modulated high-frequency signal, and transmit the modulated high-frequency signal to the ultrasonic transducer module, wherein the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module; The ultrasonic transducer module is used to obtain an audible frequency signal and generate resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal.

2. The system according to claim 1, characterized in that The driving modulation module is specifically used for: Acquire a pre-generated carrier signal, wherein the carrier signal is a square wave high-frequency signal, and the frequency of the carrier signal is the resonant frequency of the ultrasonic transducer module; The low-frequency signal is frequency modulated using the carrier signal to generate a modulated high-frequency signal.

3. The system according to claim 2, characterized in that The frequency band of the modulated high-frequency signal is determined by the voltage amplitude of the low-frequency signal.

4. The system according to claim 1, characterized in that The ultrasonic transducer module is specifically used for: Resonance is generated under the driving of the modulated high-frequency signal, and the frequency response of the audible frequency signal is increased according to the amplitude of the modulated high-frequency signal to generate an audible frequency signal with increased frequency response.

5. The system according to claim 1, characterized in that Also includes: Signal amplification module; The input end of the signal amplification module is connected to the output end of the drive modulation module, and the output end of the signal amplification module is connected to the input end of the ultrasonic transducer module; The signal amplification module is used to amplify the modulated high-frequency signal to generate an amplified high-frequency signal, and transmit the amplified high-frequency signal to the ultrasonic transducer module.

6. The system according to claim 5, characterized in that Also includes: Signal generation module; The output end of the signal generating module is connected to the input end of the driving modulation module; The signal generating module is used to generate a low-frequency signal and transmit the low-frequency signal to the driving modulation module.

7. A method for driving a micro speaker, characterized in that: Applied to the drive system according to any one of claims 1 to 6 above, the method comprises: The driving modulation module acquires a low-frequency signal to be processed, modulates the low-frequency signal to generate a modulated high-frequency signal, and transmits the modulated high-frequency signal to the ultrasonic transducer module, wherein the frequency of the modulated high-frequency signal is the resonant frequency of the ultrasonic transducer module; The ultrasonic transducer module acquires an audible frequency signal and generates resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal.

8. The method according to claim 7, characterized in that The driving modulation module modulates the low-frequency signal to generate a modulated high-frequency signal, including: Acquire a pre-generated carrier signal, wherein the carrier signal is a square wave high-frequency signal, and the frequency of the carrier signal is the resonant frequency of the ultrasonic transducer module; The low-frequency signal is frequency modulated using the carrier signal to generate a modulated high-frequency signal.

9. The method according to claim 7, characterized in that: The ultrasonic transducer module generates resonance under the drive of the modulated high-frequency signal to enhance the frequency response of the audible frequency signal, including: Resonance is generated under the driving of the modulated high-frequency signal, and the frequency response of the audible frequency signal is increased according to the amplitude of the modulated high-frequency signal to generate an audible frequency signal with increased frequency response.

10. A micro speaker, characterized in that: The micro speaker comprises: a micro speaker body and a driving system as described in any one of claims 1 to 6, wherein the driving system is arranged inside the micro speaker body.

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