Electrostatic loudspeaker, moving-coil loudspeaker and audio signal processing device

Abstract

The invention relates to an electrostatic loudspeaker, a moving-coil loudspeaker and a device for processing audio signals, and belongs to the technical field of electroacoustics. According to the technical scheme provided by the invention, the amplitude distortion of the loudspeaker can be effectively reduced; for an electrostatic loudspeaker, the amplitude distortion of the loudspeaker can be reduced by carrying out first-order, second-order or third-order derivative solving operation on an input audio signal before the input audio signal is transmitted to two fixed polar plates of the loudspeaker, and the effect is the best when the second-order derivative solving operation is carried out; for a moving-coil loudspeaker, the amplitude distortion of the loudspeaker can be reduced by carrying out first-order, second-order, third-order, fourth-order or fifth-order derivative solving operation on an input audio signal before the input audio signal is transmitted to a voice coil of the loudspeaker, and the effect of carrying out the third-order derivative solving operation is relatively good; the technical scheme provided by the invention can be used for reducing the amplitude distortion of the loudspeaker in all equipment related to the loudspeaker so as to improve the sound restoring effect of the equipment.

Description

Technical field:

[0001] This application is a divisional application of the original application number 2019104850690 (filing date: June 4, 2019, invention name: An electrostatic speaker, a dynamic speaker and a device for processing audio signals).

[0002] The present invention belongs to the field of audio and video technology, and in particular relates to an electrostatic loudspeaker, a dynamic loudspeaker and a device for processing audio signals. Background technology:

[0003] With the emergence of digital technology in audio source devices and high-fidelity audio amplifiers, the audio signal output by the final power amplifier in high-fidelity audio systems can be distorted relatively little (≤0.02%). However, the current mainstream speaker product - dynamic coil speakers - has relatively large distortion of about 2-3%. Dynamic coil speakers are unable to restore the sound information of high-fidelity digital audio signals, which has become a bottleneck in audio systems. Figure 1 and Figure 2 The structure diagram and principle diagram of the dynamic loudspeaker are respectively, the diaphragm (102), the centering support (104) and the voice coil (103) are connected together, and the voice coil (103) is in the magnetic field (in Figure 2 When an audio current flows through the voice coil (103), the voice coil (103) vibrates under the action of the magnetic field force, thereby driving the diaphragm (102) to vibrate and generate sound.

[0004] like Figure 2 , assuming that the magnetic induction intensity of the magnetic field in which the voice coil (103) is located is B, the mass of the voice coil (103) is m, the resistance is r, the effective length of the voice coil wire is l, and the inductance is L. At the beginning, an audio signal is input After a period of time t, the velocity of the voice coil (103) is v(t) and the current is i(t), then: From (1) and (2), we can get: Will Substituting into (3) and sorting it out, we get: From equation (4), we can solve i(t) and further calculate the velocity of the voice coil (103): Finally, the vibration equation of the voice coil (103) [that is, the vibration equation of the diaphragm (102)] is obtained: This allows for quantitative analysis of the distortion of dynamic loudspeakers. However, solving i(t) from equation (4) requires solving a nonlinear differential equation, which is computationally complex and may even prevent the solution of i(t).

[0005] To quantitatively analyze the distortion of a dynamic loudspeaker, the following approximation is made using the superposition principle: the electromotive force (Blv) generated by the voice coil motion is considered independently from the voltage across the voice coil resistance and inductance, and then the actual current i(t) in the voice coil is obtained by adding them together.

[0006] like Figure 2 The schematic diagram of the dynamic loudspeaker is shown. Assume that the magnetic induction intensity of the magnetic field in which the voice coil (103) is located is B, the mass of the voice coil (103) is m, the resistance is r, the effective length of the voice coil wire is l, and the inductance is L. At time t=0, an audio signal is input. The impedance of the voice coil (103) is Z=r+jnωL, n=1, 2, 3, ..., after a period of time t, the current in the voice coil (103) is i(t), and according to Kirchhoff's voltage law, we get: The solution is: The first term on the right side of equation (5) is the transient current i0(t) [i0(t) = 0 when t → ∞], and the second term is the steady-state current i1(t). Since only the steady-state current i1(t) contains information about the input audio signal u(t), only the steady-state current i1(t) will affect the distortion of the sound information output by the speaker. To facilitate the discussion of speaker distortion, only the steady-state current i1(t) needs to be considered. From equation (5), we can know that the steady-state current in the voice coil (103) is: Note: From formula (6), we can see that the steady-state current in the voice coil is a sinusoidal signal with the same frequency as the input audio signal, and its phase is shifted by an angle relative to the input audio signal. The amplitude of the steady-state current is equal to the amplitude of the input audio signal divided by the modulus of the voice coil impedance. In the following discussion of the speaker's signal processing, the steady-state current discussed is obtained in this way, and no further calculations or explanations are required. The Ampere force on the voice coil (103): Acceleration of the voice coil (103): Speed ​​of the voice coil (103): The back electromotive force generated by the voice coil (103) due to cutting the magnetic induction line is: Considering the back electromotive force E 反 , the steady-state portion of the actual current in the voice coil (103) is: The Ampere force on the voice coil (103) due to the steady-state current i′ flowing through it is: Actual acceleration of the voice coil (103): The actual speed of the voice coil (103) is: Therefore, the vibration equation of the voice coil (103) [that is, the vibration equation of the diaphragm (102), because the diaphragm (102) and the voice coil (103) are connected together through the centering support (104)] is: (7) In the formula, ① and ② are the sound information restored by the dynamic loudspeaker, and there is a phase difference between them. n=1,2,3,…….This phase difference will cause items ① and ② to interfere with each other, affecting the sound quality. In addition, their amplitudes are all functions of nω, indicating that the dynamic speaker has amplitude-frequency distortion (linear distortion). Items ③, ④, ⑤, ⑥, and ⑦ are the noise generated by the dynamic speaker during the processing of the input audio signal. From formula (7), we can see that the amplitude-frequency distortion and noise of the dynamic speaker are very serious. These distortions and noise are determined by the working principle of the dynamic speaker. In addition, the unevenness and asymmetry of the magnetic field in which the voice coil is located, the nonlinearity of the displacement of the centering support on the driving force, and other factors will also cause distortion. These distortions are caused by the more complex mechanical structure of the dynamic speaker (relative to the electrostatic speaker).

[0007] In order to restore the sound information of high-fidelity digital audio signals (distortion ≤ 0.02%), electrostatic speakers can be used. The principle is as follows Figure 3 The input audio signal is boosted 200 to 300 times by the audio transformer (301) and then applied to the two fixed plates (303). The high-voltage DC power supply (302) provides a net charge (also a static charge) to the diaphragm (304). The two fixed plates (303) are equivalent to capacitors, and their capacitance is recorded as C. Assume that the audio signal output by the audio transformer (301) is When applied to the fixed plate (303) at time t=0, the current flowing into the fixed plate (303) is: The voltage between the two fixed plates (303): Assuming the distance between the two fixed plates (303) is d, the electric field strength between the two plates is: Assuming that the static electricity carried by the diaphragm (304) is q, the electric field force on the diaphragm (304) is: Assuming the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is: The velocity of the diaphragm (304) is: Therefore, the vibration equation of the diaphragm (304) is: (8) In the formula, the term ⑧ is the sound information restored by the electrostatic speaker, and its amplitude is also a function of nω, indicating that the electrostatic speaker also has amplitude-frequency distortion. The higher the frequency, the more serious the distortion, the smaller the relative amplitude of the signal (referring to the relative amplitude of the high-frequency component under consideration and other frequency components compared with the relative amplitude of the corresponding frequency components in the original input signal), and the high-frequency components in the audio signal are suppressed; ⑨, ⑩, These three items are noises generated by the electrostatic speaker during the process of processing the input audio signal.

[0008] Comparing equations (8) and (7), we can see that the amplitude-frequency distortion and noise of electrostatic speakers are smaller than those of dynamic speakers. In addition, due to the simple structure and extremely light diaphragm of electrostatic speakers, the mechanical components hardly cause distortion to the signal.

[0009] Advantages of electrostatic speakers: low theoretical distortion; the diaphragm is extremely light, so it is extremely flexible and has excellent resolution, which can capture extremely subtle changes in music signals, making people feel very realistic, with low background noise and a sense of presence, which can fully express the charm of music.

[0010] Disadvantages of electrostatic speakers: polarization voltage is required; audio transformers are very particular about the core material and coil winding method, and cannot be produced in a standardized manner. Product performance is more dependent on the workers' skills and experience, so the output is low and the cost is high.

[0011] In terms of effect, image information is more sensitive to phase distortion, while sound information is more sensitive to amplitude distortion. The distortion of the signal amplitude relative to its individual frequency components is called amplitude-frequency distortion (amplitude-frequency distortion and amplitude distortion have the same meaning and are often used interchangeably). From the above analysis, we can see that both electrostatic and dynamic speakers exhibit significant amplitude-frequency distortion.

[0012] The technical solution of the present invention can reduce the amplitude-frequency distortion of an electrostatic loudspeaker (driven by electrostatic force) and a dynamic loudspeaker (driven by magnetic field force). Summary of the invention:

[0013] In order to reduce the amplitude-frequency distortion of the electrostatic speaker, the first-order derivative of the input audio signal can be calculated before it is transmitted to the two fixed plates of the electrostatic speaker. Figure 4 The two fixed plates (303) are equivalent to capacitors, whose capacitance is recorded as C. Assume that the audio signal output by the audio transformer (301) is Taking the derivative of u(t), we get: When a signal u′(t) is applied to the two fixed plates (303) of the electrostatic speaker at time t=0, the current flowing into the fixed plates (303) is: The voltage between the two fixed plates (303): Assuming the distance between the two fixed plates (303) is d, the electric field strength between the two plates is: Assuming that the static electricity carried by the diaphragm (304) is q, the electric field force on the diaphragm (304) is: Assuming the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is: The velocity of the diaphragm (304) is: Therefore, the vibration equation of the diaphragm (304) is: (9) This item is the sound information restored by the electrostatic speaker. is noise, comparing ⑧ and It can be seen that the amplitude-frequency distortion of the electrostatic speaker is reduced. Therefore, solving the first-order derivative of the input audio signal u(t) before transmitting it to the two fixed plates (303) can reduce the amplitude-frequency distortion of the electrostatic speaker, but in formula (9) The amplitude of this term is still a function of nω, and there is also amplitude-frequency distortion. To further reduce the distortion, the second-order derivative of the input audio signal can be solved before applying it to the fixed electrode of the speaker.

[0014] like Figure 5 ,right Taking the derivative, we get: Taking the derivative of u′(t) again, we get: At time t=0, a signal u″(t) is applied to the two fixed plates (303) of the electrostatic speaker. Then, the current flowing into the fixed plates (303) is: The voltage between the two fixed plates (303): Assuming that the distance between the two fixed plates (303) is d, the electric field strength between the plates is: Assuming that the static electricity carried by the diaphragm (304) is q, the electric field force on the diaphragm (304) is: Assuming the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is: The velocity of the diaphragm (304) is: Therefore, the vibration equation of the diaphragm (304) is: (10) This item is the sound information restored by the electrostatic speaker, without amplitude-frequency distortion. These three items are noise. Comparing equations (8) and (10), we can see that if the second-order derivative of the input audio signal u(t) is solved before it is transmitted to the two fixed plates, the amplitude-frequency distortion of the electrostatic speaker can be completely eliminated in theory.

[0015] In fact, solving the third-order derivative of the input audio signal u(t) and then adding it to the fixed plate of the electrostatic speaker can also reduce the amplitude-frequency distortion of the speaker, as explained below:

[0016] like Figure 7 ,right Taking the derivative, we get: At time t=0, a signal u″′(t) is applied to the two fixed plates (303) of the electrostatic speaker. Then, the current flowing into the fixed plates (303) is: The voltage between the two fixed plates (303): Assuming that the distance between the two fixed plates (303) is d, the electric field strength between the plates is: Assuming that the static electricity carried by the diaphragm (304) is q, the electric field force on the diaphragm (304) is: Assuming the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is: The velocity of the diaphragm (304) is: Therefore, the vibration equation of the diaphragm (304) is: (11) This item is the sound information restored by the electrostatic speaker. These three items are noise. Comparing equations (8) and (11), we can see that solving the third-order derivative of the input audio signal u(t) before transmitting it to the two fixed plates (303) can also reduce the amplitude-frequency distortion of the speaker.

[0017] Comparing equations (8), (9), (10) and (11), it can be seen that performing a first-order, second-order or third-order derivative calculation on the input audio signal u(t) before transmitting it to the two fixed plates (303) can reduce the amplitude-frequency distortion of the electrostatic speaker, among which the second-order derivative calculation has a better effect.

[0018] For dynamic speakers:

[0019] like Figure 2 , assuming that the magnetic induction intensity of the magnetic field in which the voice coil (103) is located is B, the mass of the voice coil (103) is m, the resistance is r, the effective length of the voice coil wire is l, the inductance is L, the impedance of the voice coil (103) is Z=r+jnωL, n=1, 2, 3, ..., assuming that the input audio signal The first-order derivative of the signal u(t) When applied to the voice coil (103) at time t=0, the steady-state current in the voice coil (103) (containing information of the input audio signal) is: (This formula does not consider the electromotive force Blv generated by the voice coil movement) The Ampere force on the voice coil (103) due to the steady-state current i flowing through it is: Acceleration of the voice coil (103): Speed ​​of the voice coil (103): The back electromotive force generated by the voice coil (103) due to cutting the magnetic induction line is: Considering the back electromotive force E 反 , the steady-state portion of the actual current in the voice coil (103) (containing information about the input audio signal) is: The Ampere force on the voice coil (103): Actual acceleration of the voice coil (103): The actual speed of the voice coil (103) is: Therefore, the vibration equation of the voice coil (103) [that is, the vibration equation of the diaphragm (102), because the diaphragm (102) and the voice coil (103) are connected together through the centering support (104)] is: (12) and The two items are the sound information restored by the dynamic loudspeaker, and the other items are noise. Comparing ① and ② in (7) and (12), ②With It can be seen that the amplitude-frequency distortion of the loudspeaker is reduced, but not completely eliminated. To further reduce the amplitude-frequency distortion of the loudspeaker, the input audio signal can be subjected to a second-order derivative calculation before being applied to the voice coil.

[0020] like Figure 2, assuming that the magnetic induction intensity of the magnetic field in which the voice coil (103) is located is B, the mass of the voice coil (103) is m, the resistance is r, the effective length of the voice coil wire is l, the inductance is L, the impedance of the voice coil (103) is Z=r+jnωL, n=1, 2, 3, ..., assuming that the input audio signal The second-order derivative of the signal u(t) When applied to the voice coil (103) at time t=0, the steady-state current in the voice coil (103) (containing information of the input audio signal) is: (This formula does not consider the electromotive force Blv generated by the voice coil movement) The Ampere force on the voice coil (103) due to the steady-state current i flowing through it is: Acceleration of the voice coil (103): Speed ​​of the voice coil (103): The back electromotive force generated by the voice coil (103) due to cutting the magnetic induction line is: Considering the back electromotive force E 反 , the steady-state portion of the actual current in the voice coil (103) (containing information about the input audio signal) is: The Ampere force on the voice coil (103): Actual acceleration of the voice coil (103): The actual speed of the voice coil (103) is: Therefore, the vibration equation of the voice coil (103) [that is, the vibration equation of the diaphragm (102), because the diaphragm (102) and the voice coil (3) are connected together through the centering support (104)] is: (13) and The two items are the sound information restored by the dynamic loudspeaker, and the other items are noise. Comparing ① and ② in (7) and (13), ②With It can be seen that the amplitude-frequency distortion of the loudspeaker is reduced, but still not completely eliminated.

[0021] If the third-order derivative of the input audio signal u(t) is calculated and then applied to the voice coil of the speaker: The second derivative of u(t) Taking the derivative, we get: When u″′(t) is added to the voice coil (103) at time t=0, the steady-state current (containing information of the input audio signal) in the voice coil (103) is: (This formula does not consider the electromotive force Blv generated by the voice coil movement) The Ampere force on the voice coil (103) due to the steady-state current i3 flowing through it is: Acceleration of the voice coil (103): Speed ​​of the voice coil (103): The back electromotive force generated by the voice coil (103) due to cutting the magnetic induction line is: Considering the back electromotive force E 反 , the steady-state portion of the actual current in the voice coil (103) (containing information about the input audio signal) is: The Ampere force on the voice coil (103): Actual acceleration of the voice coil (103): The actual speed of the voice coil (103) is: Therefore, the vibration equation of the voice coil (103) [that is, the vibration equation of the diaphragm (102), because the diaphragm (102) and the voice coil (103) are connected together through the centering support (104)] is: (14) and The two items are the sound information restored by the dynamic loudspeaker, and the other items are noise. Comparing ① and ② in (7) and (14), ②With It can be seen that the amplitude-frequency distortion of the speaker is further reduced; in addition, comparing the equations (13) and (14), and and It is found that solving the third-order derivative of the input audio signal is more effective in reducing the amplitude-frequency distortion of the loudspeaker than solving the second-order derivative and then adding it to the voice coil.

[0022] From the above discussion, it can be seen that for dynamic speakers (driven by magnetic field forces), solving the first-order, second-order or third-order derivative of the input audio signal and then applying it to the voice coil of the speaker can reduce the amplitude-frequency distortion of the speaker, but it cannot completely eliminate it.

[0023] If the input audio signal u(t) is subjected to a fourth-order derivative calculation and then applied to the voice coil of the speaker: Will Taking the derivative, we get: At t = 0, u (4) (t) is applied to the voice coil (103), then the steady-state current in the voice coil (103) (containing the information of the input audio signal) is: (This formula does not consider the electromotive force Blv generated by the voice coil movement) The Ampere force on the voice coil (103) due to the steady-state current i4 flowing through it is: Acceleration of the voice coil (103): Speed ​​of the voice coil (103): The back electromotive force generated by the voice coil (103) due to cutting the magnetic induction line is: Considering the back electromotive force E 反, the steady-state portion of the actual current in the voice coil (103) (containing information about the input audio signal) is: The Ampere force on the voice coil (103): Actual acceleration of the voice coil (103): The actual speed of the voice coil (103) is: Therefore, the vibration equation of the voice coil (103) [that is, the vibration equation of the diaphragm (102), because the diaphragm (102) and the voice coil (103) are connected together through the centering support (104)] is: (15) and The two items are the sound information restored by the dynamic loudspeaker, and the other items are noise. Comparing equations (7) and (15), ① and ②With It can be seen that the amplitude-frequency distortion of the loudspeaker is reduced. Therefore, performing a fourth-order derivative calculation on the input audio signal u(t) and then applying it to the voice coil can also reduce the amplitude-frequency distortion of the loudspeaker.

[0024] If the fifth-order derivative of the input audio signal u(t) is calculated and then applied to the voice coil of the dynamic loudspeaker: right Taking the derivative, we have: At t = 0, u (5) (t) is applied to the voice coil (103), then the steady-state current in the voice coil (103) (containing the information of the input audio signal) is: (This formula does not consider the electromotive force Blv generated by the voice coil movement) The Ampere force on the voice coil (103) due to the steady-state current i5 flowing through it is: Acceleration of the voice coil (103): Speed ​​of the voice coil (103): The back electromotive force generated by the voice coil (103) due to cutting the magnetic induction line is: Considering the back electromotive force E 反 , the steady-state portion of the actual current in the voice coil (103) (containing information about the input audio signal) is: The Ampere force on the voice coil (103): Actual acceleration of the voice coil (103): The actual speed of the voice coil (103) is: Therefore, the vibration equation of the voice coil (103) [that is, the vibration equation of the diaphragm (102), because the diaphragm (102) and the voice coil (103) are connected together through the centering support (104)] is: (16) and The two terms represent the sound information restored by the speaker, and the other terms represent noise. Comparing equations (7) and (16), we can see that the amplitude-frequency distortion of the speaker is reduced. Therefore, solving the fifth-order derivative of the input audio signal before applying it to the voice coil can also reduce the amplitude-frequency distortion of the dynamic coil speaker.

[0025] Comparing equations (7), (12), (13), (14), (15), and (16), we can find that the dynamic loudspeaker output contains a phase angle of and The sound information of the two items is not included, and the effects of reducing the amplitude distortion of the two items are different when different orders of derivative operations are performed on the input signal.

[0026] To sum up, for electrostatic speakers, the amplitude-frequency distortion of the speaker can be reduced by performing a first-order, second-order or third-order derivative calculation on the input audio signal and then applying it to the fixed electrode of the speaker. Among them, performing a second-order derivative calculation can completely eliminate the amplitude-frequency distortion of the speaker. For dynamic speakers, the amplitude-frequency distortion of the speaker can be reduced by performing a first-order, second-order, third-order, fourth-order or fifth-order derivative calculation on the input audio signal and then applying it to the voice coil of the speaker. Among them, performing a third-order derivative calculation has a better effect.

[0027] The processing of the input audio signal by the electrostatic speaker (driven by electrostatic force) and the dynamic speaker (driven by magnetic field force) shows that both the integral operation and the derivative operation will cause the amplitude-frequency distortion of the signal, and the effects are just the opposite (that is, the derivative operation makes the input signal amplitude become nω times the original, and the integral operation makes the input signal amplitude become the original ), and are all related to the frequency of the input signal, such as the voltage increase process (integral operation) between the two fixed plates (303) of the electrostatic speaker, the acceleration process (integral operation) of the movement of the diaphragm (304), the increase process (integral operation) of the current of the voice coil (103) in the dynamic speaker, the acceleration process (integral operation) of the movement of the voice coil (103), etc. It can be seen that integration operation exists in both electrostatic speakers and dynamic speakers, and this integration operation is indispensable and necessary for their working principles. Because derivative is the inverse operation of integration, the input audio signal is first subjected to appropriate derivative operation (i.e., pre-compensation of the amplitude-frequency distortion generated by the integration operation, using "inverse distortion" to compensate for the distortion, because once the distortion is finally manifested in the vibration of the diaphragm, it cannot be remedied) and then applied to the speaker to correct the amplitude-frequency distortion generated by the integration operation. The essence of the present invention's technical solution is that, because the speaker's integration of the audio signal generates amplitude-frequency distortion (this integration is necessary), it is necessary to perform an appropriate derivative operation on the audio signal (i.e., "pre-compensate" the input audio signal) to correct the amplitude-frequency distortion caused by the integration operation. Furthermore, this derivative operation can be implemented via either hardware or software.

[0028] Because the derivation of the input audio signal is independent of other signal processing steps (such as amplification and filtering), the ultimate effect of reducing speaker distortion is not affected by where the derivation is performed, regardless of whether the system consists of an electrostatic speaker (driven by electrostatic forces) or a dynamic speaker (driven by magnetic fields). For example, for an electrostatic speaker, the derivation can be performed within the signal transmission path from the audio transformer to the two fixed plates, or it can be integrated within the audio transformer.

[0029] The audio signal amplifiers in the sound system generally have multi-stage amplification. In this case, one or several stages of the derivative operation of the input audio signal can be integrated into one or several stages of the audio signal amplifier without affecting the final effect of the "derivative operation" of reducing the signal amplitude-frequency distortion.

[0030] Comparing electrostatic and dynamic speakers, amplitude-frequency distortion can be reduced by performing an appropriate "order" derivative calculation on the input audio signal, but the effects differ: In theory, amplitude-frequency distortion can be completely eliminated for electrostatic speakers; while dynamic speakers can reduce it, it cannot completely eliminate it. This is because dynamic speakers process audio signals more complexly: voice coil inductance distorts the signal, and the back EMF generated by the voice coil's motion cutting through magnetic flux lines also distorts the signal. It can be assumed that all speakers driven by magnetic fields experience significant amplitude-frequency distortion. This is because relative motion between the conductor and the magnetic field (intersecting magnetic flux lines) generates back EMF (which is frequency-dependent), resulting in amplitude-frequency distortion. In contrast, electrostatic speakers are not only simpler in structure, but also crucially, lack a magnetic field. Driven by electrostatic forces, they eliminate the back EMF issue, resulting in lower amplitude-frequency distortion. Therefore, electrostatic speakers offer inherent advantages over dynamic speakers (which are driven by magnetic fields). Therefore, they are often preferred in high-fidelity audio systems.

[0031] Dynamic speakers can have diaphragms made into various shapes, such as cone speakers, dome speakers, horn speakers, and flat-panel speakers. Flat-panel speakers differ from common electrostatic speakers, which are also flat. They simply make the diaphragm into a flat plate and attach it to the voice coil. When the voice coil vibrates, it drives the flat diaphragm to vibrate, producing sound. They are also dynamic speakers. There's also a ribbon speaker, which places a strip of metal foil (usually aluminum foil) in a magnetic field. When an audio current flows through it, it vibrates under the force of the magnetic field, producing sound. There's essentially no difference between this type of speaker and a dynamic speaker. The ribbon of aluminum foil is equivalent to a "voice coil plus diaphragm," stretching the voice coil wire into a ribbon that also acts as the diaphragm. Its electromagnetic properties are similar to those of a voice coil, with both exhibiting resistance and inductance. However, its resistance and inductance are smaller, resulting in less phase and amplitude distortion. However, its efficiency is lower.

[0032] Therefore, although cone speakers, dome speakers, horn speakers, flat-panel speakers and ribbon speakers have different appearances, they all work on the same principle and are driven by magnetic field forces: when audio current passes through the conductor, it vibrates under the action of the magnetic field force and produces sound. They are all dynamic speakers, so the technical solution of the present invention is applicable to these speakers. Description of the drawings: [Numbering rules for each figure: Figure number “+” component number, the two digits from the right are the component number, the same number represents the same component]

[0033] Figure 1 It is a structural diagram of a dynamic loudspeaker in the prior art.

[0034] Figure 2 It is a schematic diagram of a dynamic loudspeaker in the prior art.

[0035] Figure 3 It is a schematic diagram of an electrostatic speaker in the prior art.

[0036] Figure 4 This is a schematic diagram of Example 1.

[0037] Figure 5 This is a schematic diagram of Example 2.

[0038] Figure 6 This is a schematic diagram of Example 3.

[0039] Figure 7 This is a schematic diagram of Example 4.

[0040] Figure 8 This is a schematic diagram of Example 5.

[0041] Figure 9 This is a schematic diagram of Example 6.

[0042] Figure 10 This is a schematic diagram of Example 7.

[0043] Figure 11 This is a schematic diagram of Example 8.

[0044] Figure 12 This is a schematic diagram of Example 9.

[0045] Figure 13 This is a schematic diagram of Example 10.

[0046] Figure 14 This is a schematic diagram of Example 11.

[0047] Figure 15 This is a schematic diagram of Example 12.

[0048] Figure 16 This is a schematic diagram of Example 13.

[0049] Figure 17 This is a schematic diagram of Example 14.

[0050] Figure 18 This is a schematic diagram of Example 15.

[0051] Figure 19 This is a schematic diagram of Example 16.

[0052] Figure 20 This is a schematic diagram of Example 17.

[0053] Figure 21 This is a schematic diagram of Example 18.

[0054] Figure 22 This is a schematic diagram of Example 19.

[0055] Figure 23 This is a schematic diagram of Example 20.

[0056] Figure 24 This is a schematic diagram of Example 21.

[0057] Figure 25 This is a schematic diagram of Example 22.

[0058] Figure 26 This is a schematic diagram of Example 23.

[0059] Figure 27 This is a schematic diagram of Example 24.

[0060] Figure 28 This is a schematic diagram of Example 25.

[0061] Figure 29 This is a schematic diagram of Example 26.

[0062] Figure 30 This is a schematic diagram of Example 27. Specific implementation method:

[0063] In order to make it easier for those skilled in the art to understand the technical solution of the present invention, the following is further described through specific embodiments:

[0064] Example 1: The present invention provides an electrostatic speaker, such as Figure 4, comprising: an audio transformer (301), a first-order derivative operation module (401), a high-voltage DC power supply (302), two fixed plates (303) and a diaphragm (304); the audio transformer (301) boosts the input audio signal, the high-voltage DC power supply (302) provides a net charge to the diaphragm (304), the diaphragm (304) is located between the two fixed plates (303), the first-order derivative operation module (401) has a function of solving the first-order derivative of the signal, and the first-order derivative operation module (401) has a function of solving the first-order derivative of the signal. The first-order derivative calculation function of the first-order derivative calculation module (401) can be realized by hardware or software; the input audio signal is boosted by the audio transformer (301) and then the first-order derivative calculation is performed by the first-order derivative calculation module (401); the signal output by the first-order derivative calculation module (401) is applied to the two fixed plates (303), thereby forming a changing electric field between the two fixed plates (303); the diaphragm (304) is vibrated by the electric field force applied by the changing electric field to generate sound.

[0065] The first-order derivative operation module (401) in this embodiment can also be integrated with the audio transformer (301), so that the first-order derivative solution operation function of the first-order derivative operation module (401) is implemented inside the audio transformer (301).

[0066] Example 2: The present invention provides an electrostatic speaker, such as Figure 5 , comprising: an audio transformer (301), a second-order derivative operation module (501), a high-voltage DC power supply (302), two fixed plates (303) and a diaphragm (304); the high-voltage DC power supply (302) provides a net charge (also a static charge) to the diaphragm (304), the diaphragm (304) is located between the two fixed plates (303), the second-order derivative operation module (501) has a function of solving the second-order derivative of the signal, and the second-order derivative operation module ( The second-order derivative calculation function of the second-order derivative calculation module (501) can be realized by hardware or software. The input audio signal is boosted by the audio transformer (301) and then the second-order derivative calculation is performed by the second-order derivative calculation module (501). The signal output by the second-order derivative calculation module (501) is added to the two fixed plates (303), thereby forming a changing electric field between the two fixed plates (303). The diaphragm (304) is vibrated by the electric field force applied by the changing electric field to generate sound.

[0067] The second-order derivative operation module (501) in this embodiment can also be integrated with the audio transformer (301), so that the second-order derivative solution operation function of the second-order derivative operation module (501) is implemented inside the audio transformer (301).

[0068] Example 3: The present invention provides an electrostatic speaker, such as Figure 6 , comprising: an audio transformer (301), a third-order derivative operation module (601), a high-voltage DC power supply (302), two fixed plates (303) and a diaphragm (304); the high-voltage DC power supply (302) provides a net charge (also a static charge) to the diaphragm (304), the diaphragm (304) is located between the two fixed plates (303), the third-order derivative operation module (601) has a function of solving the third-order derivative of the signal, and the third-order derivative operation module ( The third-order derivative calculation function of the third-order derivative calculation module (601) can be realized by hardware or software. The input audio signal is boosted by the audio transformer (301) and then the third-order derivative calculation is performed by the third-order derivative calculation module (601). The signal output by the third-order derivative calculation module (601) is added to the two fixed plates (303), thereby forming a changing electric field between the two fixed plates (303). The diaphragm (304) is vibrated by the electric field force applied by the changing electric field to generate sound.

[0069] The third-order derivative operation module (601) in this embodiment can also be integrated with the audio transformer (301), so that the third-order derivative solution operation function of the third-order derivative operation module (601) is implemented inside the audio transformer (301).

[0070] Example 4: The present invention provides an electrostatic speaker, such as Figure 7 , comprising: a first-order derivative operation module (401), an audio transformer (301), a high-voltage DC power supply (302), two fixed plates (303) and a diaphragm (304); the high-voltage DC power supply (302) provides a net charge (also belonging to static charge) to the diaphragm (304), the diaphragm (304) is located between the two fixed plates (303), the first-order derivative operation module (401) has a function of solving the first-order derivative of the signal, and the first-order derivative operation module The first-order derivative calculation function of (401) can be realized by hardware or software; the input audio signal is calculated by the first-order derivative calculation module (401) and then boosted by the audio transformer (301); the signal output by the audio transformer (301) is applied to the two fixed plates (303), thereby forming a changing electric field between the two fixed plates (303); the diaphragm (304) is vibrated by the electric field force applied by the changing electric field to generate sound.

[0071] The first-order derivative operation module (401) in this embodiment may also be integrated with the audio transformer (301), so that the function of solving the first-order derivative operation of the first-order derivative operation module (401) is implemented inside the audio transformer (301).

[0072] Example 5: The present invention provides an electrostatic speaker, such as Figure 8 , comprising: two first-order derivative operation modules (401), an audio transformer (301), a high-voltage DC power supply (302), two fixed plates (303) and a diaphragm (304); the high-voltage DC power supply (302) provides a net charge (also a static charge) to the diaphragm (304), the diaphragm (304) is located between the two fixed plates (303), the first-order derivative operation module (401) has a function of solving the first-order derivative of the signal, and the first-order derivative solution operation function of the first-order derivative operation module (401) can be hard The invention is implemented by a component or software; the input audio signal is firstly passed through one of the first-order derivative operation modules (401) to perform a first-order derivative solution operation, and then added to the signal input end of the audio transformer (301); the signal output by the audio transformer (301) is then passed through another first-order derivative operation module (401) to perform a first-order derivative solution operation, and then added to the two fixed plates (303), thereby forming a changing electric field between the two fixed plates (303); the diaphragm (304) is vibrated by the electric field force applied by the changing electric field to generate sound.

[0073] The two first-order derivative operation modules (401) in this embodiment, or one of them, may also be integrated with the audio transformer (301), so that the derivative operation function of the first-order derivative operation module (401) is implemented inside the audio transformer (301).

[0074] Example 6: The present invention provides an electrostatic speaker, such as Figure 9The invention relates to a diaphragm (304) comprising an audio transformer (301), a high-voltage DC power supply (302), a second-order derivative operation circuit (901), two fixed pole plates (303) and a diaphragm (304); the second-order derivative operation circuit (901) has the function of solving the second-order derivative of the signal, the second-order derivative operation circuit (901) is integrated on one of the fixed pole plates (303), the high-voltage DC power supply (302) provides a net charge (also a static charge) to the diaphragm (304), and the diaphragm (304) is located between the two fixed pole plates (303); the input audio signal is first boosted by the audio transformer (301), then solved by the second-order derivative operation circuit (901), and then applied to the two fixed pole plates (303), thereby forming a changing electric field between the two fixed pole plates (303), and the diaphragm (304) is vibrated by the electric field force applied by the changing electric field to generate sound.

[0075] Example 7: The present invention provides a device for processing audio signals, such as Figure 10 , comprising: a first-order derivative operation module (401), an audio signal amplifier and an electrostatic speaker; the first-order derivative operation module (401) has a function of performing a first-order derivative operation on a signal, and the first-order derivative operation function of the first-order derivative operation module (401) can be implemented by hardware or software; the input audio signal is applied to the signal input end of the audio signal amplifier after the first-order derivative operation is performed by the first-order derivative operation module (401); the signal output by the audio signal amplifier is applied to the signal input end of the electrostatic speaker, so that the electrostatic speaker produces sound; the first-order derivative operation module (401) in this embodiment can also be integrated inside the audio signal amplifier.

[0076] Example 8: The present invention provides a device for processing audio signals, such as Figure 11 , comprising: two first-order derivative operation modules (401), an audio signal amplifier and an electrostatic speaker; the first-order derivative operation module (401) has the function of performing a first-order derivative operation on a signal, and the first-order derivative operation function of the first-order derivative operation module (401) can be implemented by hardware or software; the input audio signal first passes through one of the first-order derivative operation modules (401) to perform a first-order derivative operation and then is added to the signal input end of the audio signal amplifier; the signal output by the audio signal amplifier then passes through the other first-order derivative operation module (401) to perform a first-order derivative operation and then is added to the signal input end of the electrostatic speaker, so that the electrostatic speaker produces sound; in this embodiment, two or one of the first-order derivative operation modules (401) can also be integrated inside the audio signal amplifier.

[0077] Example 9: The present invention provides a device for processing audio signals, such as Figure 12 , comprising: a second-order derivative operation module (501), an audio signal amplifier and an electrostatic speaker; the second-order derivative operation module (501) has the function of performing a second-order derivative operation on a signal, and the second-order derivative operation function of the second-order derivative operation module (501) can be implemented by hardware or software; the input audio signal is applied to the signal input end of the audio signal amplifier after the second-order derivative operation is performed by the second-order derivative operation module (501); the signal output by the audio signal amplifier is applied to the signal input end of the electrostatic speaker, so that the electrostatic speaker produces sound; the second-order derivative operation module (501) in this embodiment can also be integrated inside the audio signal amplifier.

[0078] Example 10: The present invention provides a device for processing audio signals, such as Figure 13 , comprising: an audio signal amplifier, a second-order derivative operation module (501) and an electrostatic speaker; the second-order derivative operation module (501) has a function of performing a second-order derivative operation on a signal, and the second-order derivative operation function of the second-order derivative operation module (501) can be implemented by hardware or software; the input audio signal is amplified by the audio signal amplifier and then added to the signal input end of the second-order derivative operation module (501); the signal output by the second-order derivative operation module (501) is added to the signal input end of the electrostatic speaker, so that the electrostatic speaker produces sound; the second-order derivative operation module (501) in this embodiment can also be integrated into the audio signal amplifier.

[0079] Example 11: The present invention provides a device for processing audio signals, such as Figure 14 The invention comprises: an audio signal amplifier, a third-order derivative operation module (601) and an electrostatic speaker; the third-order derivative operation module (601) has the function of performing a third-order derivative operation on a signal, and the third-order derivative operation function of the third-order derivative operation module (601) can be realized by hardware or software; an input audio signal is amplified by the audio signal amplifier and then added to the signal input end of the third-order derivative operation module (601); a signal output by the third-order derivative operation module (601) is added to the signal input end of the electrostatic speaker, so that the electrostatic speaker generates sound; the third-order derivative operation module (601) in this embodiment can also be integrated inside the audio signal amplifier.

[0080] Example 12: The present invention provides a device for processing audio signals, such as Figure 15, comprising: a first-order derivative operation module (401), an audio signal amplifier, a second-order derivative operation module (501) and an electrostatic speaker; the first-order derivative operation module (401) has a function of performing a first-order derivative operation on a signal, and the second-order derivative operation module (501) has a function of performing a second-order derivative operation on a signal; the derivative operation functions of the first-order derivative operation module (401) and the second-order derivative operation module (501) can be implemented by hardware or software; the input audio signal is added to the audio signal after the first-order derivative operation is performed on the first-order derivative by the first-order derivative operation module (401). The first-order derivative operation module (401) and the second-order derivative operation module (501) are connected to the signal input end of the audio signal amplifier, the signal output by the audio signal amplifier is then subjected to a second-order derivative solution operation by the second-order derivative operation module (501), and the signal output by the second-order derivative operation module (501) is applied to the signal input end of the electrostatic speaker so that the electrostatic speaker generates sound; the positions of the first-order derivative operation module (401) and the second-order derivative operation module (501) in the system in this embodiment can be interchanged; the first-order derivative operation module (401) and the second-order derivative operation module (501) or either of them can also be integrated into the interior of the audio signal amplifier.

[0081] Example 13: The present invention provides a device for processing audio signals, such as Figure 16 , comprising: an audio signal amplifier, a first-order derivative operation module (401) and a dynamic loudspeaker; the first-order derivative operation module (401) has a function of performing a first-order derivative operation on a signal, and the first-order derivative operation function of the first-order derivative operation module (401) can be implemented by hardware or software; an input audio signal is amplified by the audio signal amplifier and then added to a signal input end of the first-order derivative operation module (401); a signal output by the first-order derivative operation module (401) is added to a signal input end of the dynamic loudspeaker, thereby causing the electrostatic loudspeaker to generate sound; the first-order derivative operation module (401) in this embodiment can also be integrated into the audio signal amplifier.

[0082] Example 14: The present invention provides a device for processing audio signals, such as Figure 17, comprising: an audio signal amplifier, a second-order derivative operation module (501) and a dynamic loudspeaker; the second-order derivative operation module (501) has a function of performing a second-order derivative operation on a signal, and the second-order derivative operation function of the second-order derivative operation module (501) can be implemented by hardware or software; an input audio signal is amplified by the audio signal amplifier and then applied to a signal input end of the second-order derivative operation module (501); a signal output by the second-order derivative operation module (501) is applied to a signal input end of the dynamic loudspeaker, thereby causing the dynamic loudspeaker to produce sound; the second-order derivative operation module (501) in this embodiment can also be integrated into the audio signal amplifier.

[0083] Example 15: The present invention provides a device for processing audio signals, such as Figure 18 , comprising: two first-order derivative operation modules (401), an audio signal amplifier and a dynamic loudspeaker; the two first-order derivative operation modules (401) both have the function of performing a first-order derivative operation on a signal, and the first-order derivative operation function of the two first-order derivative operation modules (401) can be implemented by hardware or software; the input audio signal is applied to the signal input end of the audio signal amplifier after the first-order derivative operation is performed by one of the first-order derivative operation modules (401); the signal output by the audio signal amplifier is applied to the signal input end of the dynamic loudspeaker after the first-order derivative operation is performed by the other first-order derivative operation module (401), thereby generating sound by the dynamic loudspeaker; in this embodiment, the two first-order derivative operation modules (401) or one of them can also be integrated into the audio signal amplifier.

[0084] Example 16: The present invention provides a device for processing audio signals, such as Figure 19 , comprising: an audio signal amplifier, a third-order derivative operation module (601) and a dynamic loudspeaker; the third-order derivative operation module (601) has a function of performing a third-order derivative operation on a signal, and the third-order derivative operation function of the third-order derivative operation module (601) can be implemented by hardware or software; an input audio signal is amplified by the audio signal amplifier and then applied to a signal input end of the third-order derivative operation module (601); a signal output by the third-order derivative operation module (601) is applied to a signal input end of the dynamic loudspeaker, thereby causing the dynamic loudspeaker to produce sound; the third-order derivative operation module (601) in this embodiment can also be integrated into the audio signal amplifier.

[0085] Example 17: The present invention provides a device for processing audio signals, such as Figure 20, comprising: a third-order derivative operation module (601), an audio signal amplifier and a dynamic loudspeaker; the third-order derivative operation module (601) has the function of performing a third-order derivative operation on a signal, and the third-order derivative operation function of the third-order derivative operation module (601) can be implemented by hardware or software; the input audio signal is applied to the signal input end of the audio signal amplifier after the third-order derivative operation is performed by the third-order derivative operation module (601); the signal output by the audio signal amplifier is applied to the signal input end of the dynamic loudspeaker, so that the dynamic loudspeaker produces sound; the third-order derivative operation module (601) in this embodiment can also be integrated into the audio signal amplifier.

[0086] Example 18: The present invention provides a device for processing audio signals, such as Figure 21 , comprising: a first-order derivative operation module (401), an audio signal amplifier, a second-order derivative operation module (501) and a ribbon speaker; the first-order derivative operation module (401) has a function of performing a first-order derivative operation on a signal, and the second-order derivative operation module (501) has a function of performing a second-order derivative operation on a signal; the derivative operation functions of the first-order derivative operation module (401) and the second-order derivative operation module (501) can be implemented by hardware or software; the input audio signal is applied to the signal input end of the audio signal amplifier after the first-order derivative operation is performed by the first-order derivative operation module (401); the signal output by the audio signal amplifier is applied to the signal input end of the ribbon speaker after the second-order derivative operation is performed by the second-order derivative operation module (501), so that the ribbon speaker produces sound; the first-order derivative operation module (401) and the second-order derivative operation module (501) or one of them in this embodiment can also be integrated inside the audio signal amplifier.

[0087] Example 19: The present invention provides a device for processing audio signals, such as Figure 22 , comprising: an audio signal amplifier, a fourth-order derivative operation module (2201) and a dynamic loudspeaker; the fourth-order derivative operation module (2201) has a function of performing a fourth-order derivative operation on a signal, and the fourth-order derivative operation function of the fourth-order derivative operation module (2201) can be implemented by hardware or software; an input audio signal is amplified by the audio signal amplifier and then applied to a signal input end of the fourth-order derivative operation module (2201); a signal output by the fourth-order derivative operation module (2201) is applied to a signal input end of the dynamic loudspeaker, thereby causing the dynamic loudspeaker to produce sound; the fourth-order derivative operation module (2201) in this embodiment can also be integrated into the audio signal amplifier.

[0088] Example 20: The present invention provides a device for processing audio signals, such as Figure 23 , comprising: two second-order derivative operation modules (501), an audio signal amplifier and a dynamic loudspeaker; the second-order derivative operation module (501) has a function of performing a second-order derivative operation on a signal, and the second-order derivative operation function of the second-order derivative operation module (501) can be implemented by hardware or software; the input audio signal is first subjected to a second-order derivative operation by one of the second-order derivative operation modules (501) and then added to the signal input end of the audio signal amplifier; the signal output by the audio signal amplifier is then subjected to a second-order derivative operation by the other second-order derivative operation module (501) and then added to the signal input end of the dynamic loudspeaker, thereby generating sound; the two second-order derivative operation modules (501) in this embodiment, or one of them, can also be integrated into the audio signal amplifier.

[0089] Example 21: The present invention provides a device for processing audio signals, such as Figure 24 , comprising: an audio signal amplifier, a fifth-order derivative operation module (2401) and a dynamic loudspeaker; the fifth-order derivative operation module (2401) has a function of performing a fifth-order derivative operation on a signal, and the fifth-order derivative operation function of the fifth-order derivative operation module (2401) can be implemented by hardware or software; an input audio signal is amplified by the audio signal amplifier and then applied to a signal input end of the fifth-order derivative operation module (2401); a signal output by the fifth-order derivative operation module (2401) is applied to a signal input end of the dynamic loudspeaker, thereby causing the dynamic loudspeaker to produce sound; the fifth-order derivative operation module (2401) in this embodiment can also be integrated into the audio signal amplifier.

[0090] Example 22: The present invention provides a device for processing audio signals, such as Figure 25The invention relates to a method for producing a dynamic loudspeaker comprising: a second-order derivative operation module (501), an audio signal amplifier, a third-order derivative operation module (601), and a dynamic loudspeaker; the second-order derivative operation module (501) has a function of performing a second-order derivative operation on a signal, and the third-order derivative operation module (601) has a function of performing a third-order derivative operation on a signal; the derivative operation functions of the second-order derivative operation module (501) and the third-order derivative operation module (601) can be implemented by hardware or software; the input audio signal is subjected to a second-order derivative operation by the second-order derivative operation module (501) and then applied to the signal input terminal of the audio signal amplifier; the signal output by the audio signal amplifier is subjected to a third-order derivative operation by the third-order derivative operation module (601) and then applied to the signal input terminal of the dynamic loudspeaker, so that the dynamic loudspeaker produces sound; the second-order derivative operation module (501) and the third-order derivative operation module (601) or one of them in this embodiment can also be integrated inside the audio signal amplifier.

[0091] Example 23: The present invention provides a communication device, such as Figure 26 , comprising: a memory, a digital-to-analog conversion module (D / A conversion module), an audio signal amplifier, a second-order derivative operation module and an electrostatic speaker; the memory can temporarily store digital audio signals, the digital-to-analog conversion module (D / A conversion module) can convert received digital audio signals into corresponding analog audio signals, the second-order derivative operation module has a function of solving the second-order derivative of the analog audio signal, and the second-order derivative solution operation function of the second-order derivative operation module can be implemented by hardware or software; the digital audio signal output by the memory is converted into a corresponding analog audio signal by the digital-to-analog conversion module (D / A conversion module) and then transmitted to the signal input end of the audio signal amplifier, the analog audio signal output by the audio signal amplifier is solved by the second-order derivative operation module and then applied to the signal input end of the electrostatic speaker, thereby causing the electrostatic speaker to produce sound.

[0092] The second-order derivative operation module described in this embodiment can be replaced by a first-order or third-order derivative operation module, and the derivative operation function of the first-order or third-order derivative operation module can be implemented by hardware or software.

[0093] Example 24: The present invention provides a communication device, such as Figure 27, comprising: a memory, a digital-to-analog conversion module (D / A conversion module), an audio signal amplifier, a third-order derivative operation module and a dynamic speaker; the memory can store digital audio signals, the digital-to-analog conversion module (D / A conversion module) can convert the received digital audio signals into corresponding analog audio signals; the third-order derivative operation module has the function of solving the third-order derivative of the analog audio signal output by the digital-to-analog conversion module, and the third-order derivative solution operation function of the third-order derivative operation module can be implemented by hardware or software; the digital audio signal output by the memory is converted into a corresponding analog audio signal by the digital-to-analog conversion module (D / A conversion module) and then transmitted to the signal input end of the audio signal amplifier; the analog audio signal output by the audio signal amplifier is solved by the third-order derivative operation module and then applied to the signal input end of the dynamic speaker, thereby causing the dynamic speaker to produce sound.

[0094] The third-order derivative operation module described in this embodiment can be replaced by a first-order, second-order, fourth-order or fifth-order derivative operation module, and the derivative operation function of the first-order, second-order, fourth-order or fifth-order derivative operation module can be implemented by hardware or software.

[0095] Example 25: The present invention provides a communication device, such as Figure 28 The invention comprises an acoustic-to-electrical conversion module, a second-order derivative operation module, an analog-to-digital conversion module (A / D conversion module), a carrier generator, a modulator, a signal amplifier, and an antenna. The acoustic-to-electrical conversion module converts the voice information generated by the audio information source into a corresponding analog audio electrical signal. The second-order derivative operation module has the function of solving the second-order derivative of the analog audio electrical signal. The second-order derivative operation function of the second-order derivative operation module can be implemented in hardware or software. The analog-to-digital conversion module (A / D conversion module) converts the received analog audio electrical signal into a corresponding digital audio signal. The carrier generator is used to generate a high-frequency carrier (generally with a frequency of 800MHz to 2500MHz for long-distance transmission). The modulator can perform an operation on the digital audio signal to be transmitted with the carrier so that the calculated carrier contains the information of the digital audio signal. The signal amplifier amplifies the modulated wave output by the modulator to achieve sufficient power for transmission. The modulated carrier (containing the information of the digital audio signal) is converted into an electromagnetic wave by the antenna and transmitted.

[0096] The second-order derivative operation module described in this embodiment can be replaced by a first-order, third-order, fourth-order or fifth-order derivative operation module, and the derivative operation function of the first-order, third-order, fourth-order or fifth-order derivative operation module can be implemented by hardware or software.

[0097] Example 26: The present invention provides a communication device, such as Figure 29 , comprising: an antenna, a primary signal amplifier, a demodulator, a digital-to-analog conversion module (D / A conversion module), a second-order derivative operation module, a final-stage signal amplifier, and an electrostatic speaker; the antenna is used to receive electromagnetic waves transmitted from space; the primary signal amplifier amplifies the weak electrical signal received by the antenna; the demodulator restores the digital audio signal sent by the transmitter from the received modulated wave; the digital-to-analog conversion module (D / A conversion module) converts the digital audio signal restored by the demodulator into a corresponding analog audio signal; the second-order derivative operation module has the function of solving the second-order derivative of the analog audio signal, and the second-order derivative solution operation function of the second-order derivative operation module can be implemented in hardware or software; the analog audio signal is solved by the second-order derivative operation module and then amplified by the final-stage signal amplifier; the signal output by the final-stage signal amplifier is applied to the signal input terminal of the electrostatic speaker, thereby causing the electrostatic speaker to produce sound.

[0098] The second-order derivative operation module described in this embodiment can be replaced by a first-order or third-order derivative operation module, and the derivative operation function of the first-order or third-order derivative operation module can be implemented by hardware or software.

[0099] Example 27: The present invention provides a communication device, such as Figure 30 , comprising: an antenna, a primary signal amplifier, a demodulator, a digital-to-analog conversion module (D / A conversion module), a third-order derivative operation module, a final-stage signal amplifier, and a dynamic speaker; the antenna is used to receive electromagnetic waves transmitted from space; the primary signal amplifier is used to amplify the weak electrical signal (whose voltage is generally in the mV or μV range) received by the antenna; the demodulator restores the digital audio signal sent by the transmitter from the received modulated wave; the digital-to-analog conversion module (D / A conversion module) converts the digital audio signal restored by the demodulator into a corresponding analog audio signal; the third-order derivative operation module has the function of solving the third-order derivative of the analog audio signal, and the derivative operation function of the third-order derivative operation module can be implemented in hardware or software; the analog audio signal is solved by the third-order derivative operation module and then amplified by the final-stage signal amplifier, and the analog audio signal output by the final-stage signal amplifier is applied to the signal input terminal of the dynamic speaker, thereby causing the dynamic speaker to produce sound.

[0100] The third-order derivative operation module described in this embodiment can be replaced by a first-order, second-order, fourth-order or fifth-order derivative operation module, and the derivative operation function of the first-order, second-order, fourth-order or fifth-order derivative operation module can be implemented by hardware or software.

[0101] The above embodiments are descriptions of the technical solutions of the present invention from the perspective of specific implementation methods, so that technicians in this field can understand the core idea of ​​the technical solutions of the present invention more clearly and accurately. As a person of ordinary skill in the art, you can perform appropriate equivalent transformations and recombinations on these embodiments to achieve the same technical effects without changing the core idea of ​​the technical solutions of the present invention. Therefore, these embodiments cannot be used as limitations on the content of the present invention. The scope of protection claimed by the present invention shall be based on the scope defined in the claims.

Claims

1. An electrostatic speaker, comprising an audio transformer (301), a high-voltage DC power supply (302), two fixed plates (303) and a diaphragm (304), characterized in that: The electrostatic loudspeaker also includes a second-order derivative operation module, which has the function of performing a second-order derivative operation on a signal. The second-order derivative operation module is located on a transmission path of the signal, which is a path from a signal input end of the electrostatic loudspeaker to the two fixed plates (303). The second-order derivative operation module can reduce the amplitude-frequency distortion of the sound output by the electrostatic loudspeaker by performing a second-order derivative operation on the signal. The audio transformer (301) boosts the signal, and the high-voltage DC power supply (302) provides a net charge to the diaphragm (304). The diaphragm (304) is located between the two fixed plates (303). The signal subjected to the second-order derivative operation by the second-order derivative operation module is applied to the two fixed plates (303), thereby generating a changing electric field between the two fixed plates (303). The diaphragm (304) vibrates under the action of the electric field force applied by the changing electric field to generate sound.

2. The electrostatic speaker according to claim 1, wherein: The second-order derivative operation function of the second-order derivative operation module can be implemented by hardware and / or software.

3. The electrostatic speaker according to claim 1, wherein: The second-order derivative operation module can be replaced by a first-order or third-order derivative operation module. The first-order or third-order derivative operation module has the function of performing first-order or third-order derivative operations on the signal. The first-order or third-order derivative operation function of the first-order or third-order derivative operation module can be implemented by hardware and / or software.

4. A device for processing a signal, comprising: A signal amplifier and an electrostatic speaker, characterized in that: the device also includes a second-order derivative operation module; the signal amplifier has the function of amplifying the signal, and the second-order derivative operation module has the function of performing a second-order derivative operation on the signal; the second-order derivative operation module is located on the transmission path of the signal, and the transmission path is from the signal input end of the device to the signal input end of the electrostatic speaker; the second-order derivative operation module can reduce the amplitude-frequency distortion of the sound output by the electrostatic speaker by performing a second-order derivative operation on the signal.

5. The device according to claim 4, characterized in that: The second-order derivative operation function of the second-order derivative operation module can be implemented by hardware and / or software.

6. The device according to claim 4, characterized in that: The device also includes a digital-to-analog conversion module, which has the function of converting digital signals into analog signals.

7. The device according to claim 6, characterized in that: The device also includes a memory, which has the function of storing digital signals.

8. The device according to claim 6, characterized in that: The device also includes an antenna and a demodulator. The antenna is used to receive modulated electromagnetic waves transmitted from the air, and the demodulator has the function of demodulating the audio signal from the received modulated waves.

9. The device according to claim 8, characterized in that: The device also includes a primary signal amplifier, which has the function of amplifying the signal.

10. The device according to claim 4, characterized in that: The second-order derivative operation module can be replaced by a first-order or third-order derivative operation module, and the first-order or third-order derivative operation module has the function of performing first-order or third-order derivative operation on the signal. The first-order or third-order derivative operation function of the first-order or third-order derivative operation module can be implemented by hardware and / or software.

11. A device for processing a signal, comprising: An acoustic-to-electric conversion module, an analog-to-digital conversion module, a carrier generator, a modulator and an antenna, characterized in that: the device also includes a second-order derivative operation module; the acoustic-to-electric conversion module converts voice information into a corresponding analog electrical signal, and the analog-to-digital conversion module can convert the analog electrical signal into a digital signal; the modulator uses the received digital signal to modulate the carrier generated by the carrier generator and transmits the modulated carrier to the antenna, and the antenna converts the received modulated carrier into an electromagnetic wave and sends it out; the second-order derivative operation module has the function of performing a second-order derivative operation on the signal, and the second-order derivative operation module is located on the transmission path of the signal, and the transmission path is from the electrical signal generating end of the acoustic-to-electric conversion module to the transmitting end of the antenna. The second-order derivative operation module can reduce the amplitude-frequency distortion of the sound generated by the signal in the speaker of the transmission terminal by performing a second-order derivative operation on the signal.

12. The electrostatic speaker according to claim 11, characterized in that: The second-order derivative operation function of the second-order derivative operation module can be implemented by hardware and / or software.

13. The device according to claim 11, characterized in that: The device also includes a signal amplifier; the signal amplifier is used to amplify the signal.

14. The device according to claim 11, characterized in that: The second-order derivative operation module can be replaced by a first-order, third-order or fourth-order derivative operation module. The first-order, third-order or fourth-order derivative operation module has the function of performing first-order, third-order or fourth-order derivative operation on the signal. The first-order, third-order or fourth-order derivative operation function of the first-order, third-order or fourth-order derivative operation module can be implemented by hardware and / or software.

15. A dynamic loudspeaker comprising a magnet, a voice coil and a diaphragm, characterized in that: The dynamic loudspeaker also includes a third-order derivative operation module, which has the function of performing a third-order derivative operation on an input signal. The third-order derivative operation module is located on the signal transmission path, which is the path from the signal input end of the dynamic loudspeaker to the voice coil. The third-order derivative operation module can reduce the amplitude-frequency distortion of the sound output by the dynamic loudspeaker by performing a third-order derivative operation on the signal; the voice coil is in the magnetic field generated by the magnet, and the voice coil and the diaphragm are connected together; when the signal that has undergone the third-order derivative operation by the third-order derivative operation module passes through the voice coil, the voice coil vibrates due to the action of the magnetic field force, thereby driving the diaphragm to vibrate and produce sound.

16. The dynamic loudspeaker according to claim 15, characterized in that: The third-order derivative operation function of the third-order derivative operation module can be implemented by hardware and / or software.

17. The dynamic loudspeaker according to claim 15, wherein: The third-order derivative operation module can be replaced by a second-order or fourth-order derivative operation module. The second-order or fourth-order derivative operation module has the function of performing second-order or fourth-order derivative operation on the signal. The second-order or fourth-order derivative operation function of the second-order or fourth-order derivative operation module can be implemented by hardware and / or software.

18. A signal processing device comprising a signal amplifier and a dynamic loudspeaker, characterized in that: The device also includes a third-order derivative operation module; the signal amplifier has the function of amplifying the signal, and the third-order derivative operation module has the function of performing a third-order derivative operation on the signal. The third-order derivative operation module is located on the transmission path of the signal, and the transmission path is from the signal input end of the device to the signal input end of the dynamic loudspeaker. The third-order derivative operation module can reduce the amplitude-frequency distortion of the sound output by the dynamic loudspeaker by performing a third-order derivative operation on the signal.

19. The device according to claim 18, characterized in that: The third-order derivative operation function of the third-order derivative operation module can be implemented by hardware and / or software.

20. The device according to claim 18, characterized in that: The device also includes a digital-to-analog conversion module, which has the function of converting digital signals into analog signals.

21. The device according to claim 20, characterized in that: The device also includes a memory, which has the function of storing digital signals.

22. The device according to claim 20, characterized in that: The device also includes an antenna and a demodulator. The antenna is used to receive modulated electromagnetic waves transmitted from the air, and the demodulator has the function of demodulating the audio signal from the received modulated waves.

23. The device according to claim 22, characterized in that: The device also includes a primary signal amplifier, which has the function of amplifying the signal.

24. The device according to claim 18, characterized in that: The third-order derivative operation module can be replaced by a second-order or fourth-order derivative operation module. The second-order or fourth-order derivative operation module has the function of performing second-order or fourth-order derivative operation on the signal. The second-order or fourth-order derivative operation function of the second-order or fourth-order derivative operation module can be implemented by hardware and / or software.

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