CN110913317A - Electrostatic loudspeaker, moving-coil loudspeaker and device for processing audio signal - Google Patents

Electrostatic loudspeaker, moving-coil loudspeaker and device for processing audio signal Download PDF

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CN110913317A
CN110913317A CN201910485069.0A CN201910485069A CN110913317A CN 110913317 A CN110913317 A CN 110913317A CN 201910485069 A CN201910485069 A CN 201910485069A CN 110913317 A CN110913317 A CN 110913317A
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differential operation
order differential
signal
audio signal
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董耀斌
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Abstract

The invention relates to an electrostatic loudspeaker, a moving-coil loudspeaker and a device for processing audio signals, belonging to the technical field of electroacoustic technology; the technical scheme provided by the invention can effectively reduce the amplitude distortion of the loudspeaker; for an electrostatic speaker, performing first, second or third order differential operations on an input audio signal before it is transmitted to two fixed plates of the speaker can reduce amplitude distortion of the speaker, wherein the case of performing second order differential operations to reduce distortion is the best; for a moving coil loudspeaker, performing first-order, second-order, third-order, fourth-order or fifth-order differential operation on an input audio signal before the input audio signal is transmitted to a voice coil of the loudspeaker can reduce amplitude distortion of the loudspeaker, wherein the effect of reducing distortion by performing third-order differential operation is best; the technical scheme of the invention can be used for reducing amplitude distortion of the loudspeaker in all devices related to the loudspeaker so as to improve the effect of the device on sound reproduction.

Description

Electrostatic loudspeaker, moving-coil loudspeaker and device for processing audio signal
The technical field is as follows: the invention belongs to the technical field of sound images, and particularly relates to an electrostatic loudspeaker, a moving-coil loudspeaker and a device for processing audio signals.
Background art:
with the advent of digital technology for sound source equipment and high fidelity audio amplifiers, audio signals output by a final stage power amplifier in a high fidelity sound system can be distorted to a relatively small extent (less than or equal to 0.02%), but the distortion of a current main stream ____ moving coil loudspeaker of the loudspeaker is relatively large, about 2-3%, and the moving coil loudspeaker cannot restore sound information of high fidelity digital audio signals, which has become the bottleneck of the sound system. Fig. 1 and 2 are a schematic diagram and a structural diagram of a moving-coil speaker, respectively, in which a diaphragm (102) and a centering pad (104) are connected to a voice coil (103), the voice coil (103) is in a magnetic field (shown by a convergent dashed line with an arrow in fig. 2), and when an audio current flows through the voice coil (103), the voice coil is vibrated by the magnetic field, so as to drive the diaphragm (102) to vibrate to generate sound.
Referring to fig. 2, assuming that the magnetic induction 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, an audio signal is input at the start time
Figure BSA0000184173980000011
When the time t passes, the speed v (t) of the voice coil (103) and the current i (t) are 1, 2, 3, … …, then:
Figure BSA0000184173980000012
Figure BSA0000184173980000013
obtained from (1) and (2):
Figure BSA0000184173980000014
will be provided with
Figure BSA0000184173980000015
Substituting n-1, 2, 3, … … into formula (3) and finishing to obtain:
Figure BSA0000184173980000016
the velocity of the voice coil (103) is further determined by solving the equation (4) to obtain i (t):
Figure BSA0000184173980000017
finally, the vibration equation of the voice coil (103) [ namely the vibration equation of the diaphragm (102) ] is obtained]：
Figure BSA0000184173980000018
Therefore, the distortion of the moving-coil loudspeaker can be quantitatively analyzed, but solving i (t) from the formula (4) requires solving a nonlinear differential equation, and the operation is complicated, even i (t) cannot be solved.
To quantitatively analyze the distortion of a moving coil loudspeaker, the following approximation is performed using the principle of superposition: the electromotive force (Blv) due to the voice coil motion is considered separately from the voltage on the resistance and inductance of the voice coil, and finally superimposed to obtain the actual current i (t) in the voice coil.
As shown in fig. 2, a schematic diagram of a moving-coil speaker is shown, where the magnetic induction of a magnetic field in which a voice coil (103) is located is B, the mass of the voice coil (103) is m, the resistance is r, the effective length of a voice coil wire is L, and the inductance is L, and an audio signal is input at a time t equal to 0
Figure BSA0000184173980000021
n is 1, 2, 3, … …, the impedance of the voice coil (103) is Z + jn ω L, n is 1, 2, 3, … …, and after a period of time t, the current in the voice coil (103) is i (t), which is obtained from kirchhoff's voltage law:
Figure BSA0000184173980000022
obtaining by solution:
Figure BSA0000184173980000023
(5) the first term on the right side of the equation is the transient current i0(t) [ → ∞ time, i0(t)＝0]The second term is the steady-state current i1(t); because only the steady-state current i1(t) contains information of the input audio signal u (t), so that only the steady-state current i1(t) will affect the distortion of the sound output from the loudspeaker, and for the convenience of discussing the distortion of the loudspeaker, only the steady-state current i needs to be considered1(t); from the expression (5), the steady-state current in voice coil [ (103 ]) is:
Figure BSA0000184173980000024
note: the formula (6) shows that: the steady-state current in the voice coil is a sinusoidal signal having the same frequency as the input audio signal and phase-shifted by an angle relative to the input audio signal
Figure BSA0000184173980000025
And n is 1, 2, 3, … …, and 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 processing of signals involving loudspeakers, the steady-state currents discussed are all processed in this way and are not further described.
Ampere force to which voice coil (103) is subjected:
Figure BSA0000184173980000026
n＝1，2，3，……
acceleration of voice coil (103):
Figure BSA0000184173980000027
n＝1，2，3，……
speed of voice coil (103):
Figure BSA0000184173980000028
Figure BSA0000184173980000031
back electromotive force of the voice coil (103) due to cutting of magnetic induction lines:
Figure BSA0000184173980000032
taking into account the back electromotive force EInverse directionThe steady-state part of the actual current in the voice coil (103) is:
Figure BSA0000184173980000033
the ampere force in the voice coil (103) caused by the current i' flowing in the steady state is as follows:
Figure BSA0000184173980000034
actual acceleration of voice coil (103):
Figure BSA0000184173980000035
Figure BSA0000184173980000041
the actual speed of the voice coil (103) is:
Figure BSA0000184173980000042
Figure BSA0000184173980000051
therefore, the vibration equation of the voice coil (103) [ i.e. the vibration equation of the diaphragm (102), since the diaphragm (102) and the voice coil (103) are connected together by the centering pad (104) ] is as follows:
Figure BSA0000184173980000052
Figure BSA0000184173980000061
Figure BSA0000184173980000071
(7) wherein ① and ② are sound information reproduced by the moving-coil loudspeaker, and phase difference exists between the sound information and the sound information
Figure BSA0000184173980000072
The amplitude of the two terms ① and ② is a function of n omega, which shows that the moving-coil loudspeaker has amplitude-frequency distortion (belonging to linear distortion), the terms ③, ④, ⑤, ⑥ and ⑦ are noise generated by the moving-coil loudspeaker in the process of processing the input audio signal, the amplitude-frequency distortion and the noise of the moving-coil loudspeaker are serious according to the formula (7), and the distortion and the noise are determined by the working principle of the moving-coil loudspeaker, and the factors of the non-uniformity and the asymmetry of the magnetic field where the voice coil is located, the non-linearity of the driving force caused by the displacement of the centering disk and the like also cause distortion, which is generated by the mechanical structure of the more complex moving-coil loudspeaker (relative to the electrostatic loudspeaker).
In order to restore sound information of a high-fidelity digital audio signal (distortion is less than or equal to 0.02%), an electrostatic loudspeaker can be adopted, the principle is shown in figure 3, an input audio signal is boosted by 200-300 times through an audio transformer (301) and then is added to two fixed polar plates (303), a high-voltage direct current power supply (302) provides net charges (belonging to static charges) for a vibrating diaphragm (304), the two fixed polar plates (303) are equivalent to capacitors, the capacitors are marked as C, and the audio signal output by the audio transformer (301) is set
Figure BSA0000184173980000073
When n is 1, 2, 3, … … and is applied to the fixed pole plate (303) at the time when t is 0, the current flowing into the fixed pole plate (303) is:
Figure BSA0000184173980000074
voltage between the two fixed plates (303):
Figure BSA0000184173980000075
if the distance between the two fixed polar plates (303) is d, the electric field intensity between the two polar plates is as follows:
Figure BSA0000184173980000081
if the electrostatic quantity of the diaphragm (304) is q, the electric field force applied to the diaphragm (304) is:
Figure BSA0000184173980000082
if the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is:
Figure BSA0000184173980000083
the speed of the diaphragm (304) is:
Figure BSA0000184173980000084
the equation of vibration of the diaphragm (304) is:
Figure BSA0000184173980000085
Figure BSA0000184173980000091
(8) the term ⑧ in the equation is the sound information restored by the electrostatic speaker, and the amplitude is also a function of n ω, which indicates that the electrostatic speaker also has amplitude-frequency distortion, the higher the frequency is, the more serious the distortion is, and the relative amplitude of the signal (referring to the relative amplitude of the high-frequency component to be considered and other frequency components and the original input signal)Relative amplitude of corresponding frequency components) is smaller, high frequency components in the audio signal are suppressed, ⑨, ⑩,
Figure BSA0000184173980000092
These three terms are the noise generated by the electrostatic speaker during processing of the input audio signal.
Comparing the formulas (8) and (7) shows that: the amplitude-frequency distortion and noise of the electrostatic loudspeaker are smaller than those of a moving-coil loudspeaker; in addition, since the electrostatic speaker has a simple structure and the diaphragm is extremely light in weight, the mechanical parts hardly distort the signal.
The electrostatic loudspeaker has the advantages that: the theoretical distortion is small; the diaphragm has extremely light weight, excellent flexibility and analytic power, can capture extremely fine changes in music signals, enables people to feel very vivid, has low background noise and telepresence, and can fully express the charm of music.
Disadvantages of electrostatic loudspeakers: a polarizing voltage is required; the audio transformer is very exquisite in iron core material and coil winding method, can not be produced in a standardized mode, and is low in yield and high in cost due to the fact that product performance depends on the technology and experience of workers.
In effect, image information is more sensitive to phase distortion and sound information is more sensitive to amplitude distortion. The distortion of the signal amplitude with respect to each frequency component is called amplitude-frequency distortion (amplitude-frequency distortion and amplitude distortion have the same meaning and are mixed in many cases). From the above analysis, it can be seen that: both electrostatic and moving coil loudspeakers suffer from severe amplitude-frequency distortion.
The technical scheme of the invention can reduce the amplitude-frequency distortion of the electrostatic loudspeaker (driven by electrostatic force) and the moving-coil loudspeaker (driven by magnetic field force).
The invention content is as follows:
to reduce amplitude-frequency distortion of the electrostatic speaker, the input audio signal may be differentiated before being transmitted to the two fixed plates of the electrostatic speaker. As shown in fig. 4, the two fixed plates (303) correspond to capacitors, the capacitance of which is denoted as C, and the audio signal output by the audio transformer (301) is set
Figure BSA0000184173980000093
n is 1, 2, 3, … …, and u (t) is derived as:
Figure BSA0000184173980000094
when a signal u' (t) is applied to two fixed plates (303) of the electrostatic speaker at a time t-0, the current flowing into the fixed plates (303) is:
Figure BSA0000184173980000095
voltage between two fixed plates (303):
Figure BSA0000184173980000096
Figure BSA0000184173980000101
if the distance between the two fixed polar plates (303) is d, the electric field intensity between the two polar plates is:
Figure BSA0000184173980000102
if the electrostatic quantity of the diaphragm (304) is q, the electric field force applied to the diaphragm (304) is:
Figure BSA0000184173980000103
if the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is:
Figure BSA0000184173980000104
the speed of the diaphragm (304) is:
Figure BSA0000184173980000105
the equation of vibration of the diaphragm (304) is:
Figure BSA0000184173980000106
Figure BSA0000184173980000111
(9) in the formula
Figure BSA0000184173980000112
This term is the sound information reproduced by the electrostatic speaker,
Figure BSA0000184173980000113
comparing ⑧ and (9) in the two formulas (8) and (9) for noise
Figure BSA0000184173980000114
Therefore, the following steps are carried out: amplitude-frequency distortion of the electrostatic speaker is reduced. Therefore, the amplitude-frequency distortion of the electrostatic speaker can be reduced by performing a first order differential operation on the input audio signal u (t) before the input audio signal u (t) is transmitted to the two fixed plates (303), but in the formula (9)
Figure BSA0000184173980000115
The magnitude of this term is still a function of n ω and there is also amplitude-frequency distortion. To further reduce distortion, the input audio signal may be subjected to a second order differential operation and then applied to a fixed plate of the speaker.
As shown in FIG. 5, for
Figure BSA0000184173980000116
n is 1, 2, 3, … …, and the derivation is obtained:
Figure BSA0000184173980000117
the derivation of u' (t) again yields:
Figure BSA0000184173980000118
when a signal u' (t) is applied to two fixed plates (303) of the electrostatic loudspeaker at the time when t is 0, the current flowing into the fixed plates (303) is as follows:
Figure BSA0000184173980000119
voltage between two fixed plates (303):
Figure BSA00001841739800001110
and if the distance between the two fixed polar plates (303) is d, the electric field intensity between the polar plates is as follows:
Figure BSA00001841739800001111
if the electrostatic quantity of the diaphragm (304) is q, the electric field force applied to the diaphragm (304) is:
Figure BSA0000184173980000121
if the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is:
Figure BSA0000184173980000122
the speed of the diaphragm (304) is:
Figure BSA0000184173980000123
the equation of vibration of the diaphragm (304) is:
Figure BSA0000184173980000124
Figure BSA0000184173980000131
(10) in the formula
Figure BSA0000184173980000132
This term is the acoustic information reproduced by the electrostatic speaker, without amplitude-frequency distortion,
Figure BSA0000184173980000133
these three terms are noise. Comparing the formulas (8) and (10) shows that: the input audio signal u (t) is subjected to second-order differential operation before being transmitted to the two fixed polar plates, so that amplitude-frequency distortion of the electrostatic loudspeaker can be completely eliminated theoretically.
The amplitude-frequency distortion of the loudspeaker can also be reduced by carrying out third-order differential operation on the input audio signal u (t) and then adding the input audio signal u (t) to a fixed polar plate of the electrostatic loudspeaker, and the description is as follows:
as shown in FIG. 7, for
Figure BSA0000184173980000134
And n is 1, 2, 3 and … …, and the derivation is obtained:
Figure BSA0000184173980000135
when a signal u' (t) is applied to two fixed plates (303) of the electrostatic speaker at the time t equals 0, the current flowing into the fixed plates (303) is:
Figure BSA0000184173980000136
voltage between two fixed plates (303):
Figure BSA0000184173980000137
and if the distance between the two fixed polar plates (303) is d, the electric field intensity between the polar plates is as follows:
Figure BSA0000184173980000138
if the electrostatic quantity of the diaphragm (304) is q, the electric field force applied to the diaphragm (304) is:
Figure BSA0000184173980000139
if the mass of the diaphragm (304) is m, the acceleration of the diaphragm (304) is:
Figure BSA00001841739800001310
the speed of the diaphragm (304) is:
Figure BSA0000184173980000141
the equation of vibration of the diaphragm (304) is:
Figure BSA0000184173980000142
(11) in the formula
Figure BSA0000184173980000143
This term is the sound information reproduced by the electrostatic speaker,
Figure BSA0000184173980000144
these three terms are noise. Comparing the two formulas (8) and (11) shows that: performing a third order differential operation on the input audio signal u (t) before it is transmitted to the two stationary plates 303 can also reduce the amplitude-frequency distortion of the speaker.
Comparing the expressions (8), (9), (10) and (11) shows that: the amplitude-frequency distortion of the electrostatic loudspeaker can be reduced by carrying out first-order, second-order or third-order differential operation on the input audio signal u (t) before the input audio signal u (t) is transmitted to the two fixed polar plates (303), wherein the second-order differential operation has better effect.
For a moving coil speaker:
as shown in fig. 2, let B be the magnetic induction of the magnetic field in which the voice coil (103) is located, m be the mass of the voice coil (103), r be the resistance, L be the effective length of the voice coil wire, L be the inductance, Z ═ r + jn ω L be the impedance of the voice coil (103), n ═ 1, 2, 3, … …, let 1 be the input audio signal
Figure BSA0000184173980000151
Figure BSA0000184173980000152
n-1, 2, 3, … …, first derivative of signal u (t)
Figure BSA0000184173980000153
When n is 1, 2, 3, … … is applied to the voice coil (103) at the time when t is 0, the steady-state current (containing information of the input audio signal) in the voice coil (103) is:
Figure BSA0000184173980000154
(this equation temporarily does not consider electromotive force Blv generated by voice coil motion)
The ampere force of the voice coil (103) caused by the current i flowing in a steady state is as follows:
Figure BSA0000184173980000155
acceleration of voice coil (103):
Figure BSA0000184173980000156
speed of voice coil (103):
Figure BSA0000184173980000157
back electromotive force of the voice coil (103) due to cutting of magnetic induction lines:
Figure BSA0000184173980000158
taking into account the back electromotive force EInverse directionThe steady-state portion of the actual current in the voice coil (103) (containing information of the input audio signal) is:
Figure BSA0000184173980000161
ampere force to which voice coil (103) is subjected:
Figure BSA0000184173980000162
actual acceleration of voice coil (103):
Figure BSA0000184173980000163
the actual speed of the voice coil (103) is:
Figure BSA0000184173980000164
Figure BSA0000184173980000171
therefore, the vibration equation of the voice coil (103) [ i.e. the vibration equation of the diaphragm (102), since the diaphragm (102) and the voice coil (103) are connected together by the centering pad (104) ] is as follows:
Figure BSA0000184173980000181
Figure BSA0000184173980000191
Figure BSA0000184173980000201
(12) in the formula
Figure BSA0000184173980000202
And
Figure BSA0000184173980000203
two terms are the sound information reproduced by the moving-coil speaker, the other term is noise, ① in the formula (7) and the formula (12) are compared with
Figure BSA0000184173980000204
② and
Figure BSA0000184173980000205
therefore, the following steps are carried out: the amplitude-frequency distortion of the loudspeaker is reduced but not completely eliminated. In order to further reduce the amplitude-frequency distortion of the loudspeaker, the input audio signal can be subjected to second-order differential operation and then added to the voice coil.
As shown in fig. 2, let B be the magnetic induction of the magnetic field in which the voice coil (103) is located, m be the mass of the voice coil (103), r be the resistance, L be the effective length of the voice coil wire, L be the inductance, Z ═ r + jn ω L be the impedance of the voice coil (103), n ═ 1, 2, 3, … …, let 1 be the input audio signal
Figure BSA0000184173980000206
Figure BSA0000184173980000207
n-1, 2, 3, … …, the second derivative of signal u (t)
Figure BSA0000184173980000208
When n is 1, 2, 3, … … is applied to the voice coil (103) at the time when t is 0, the steady-state current (containing information of the input audio signal) in the voice coil (103) is:
Figure BSA0000184173980000209
(this equation temporarily does not consider electromotive force Blv generated by voice coil motion)
The ampere force of the voice coil (103) caused by the current i flowing in a steady state is as follows:
Figure BSA00001841739800002010
acceleration of voice coil (103):
Figure BSA00001841739800002011
speed of voice coil (103):
Figure BSA00001841739800002012
Figure BSA0000184173980000211
back electromotive force of the voice coil (103) due to cutting of magnetic induction lines:
Figure BSA0000184173980000212
taking into account the back electromotive force EInverse directionThe steady-state portion of the actual current in the voice coil (103) (containing information of the input audio signal) is:
Figure BSA0000184173980000213
ampere force to which voice coil (103) is subjected:
Figure BSA0000184173980000214
actual acceleration of voice coil (103):
Figure BSA0000184173980000215
Figure BSA0000184173980000221
the actual speed of the voice coil (103) is:
Figure BSA0000184173980000222
Figure BSA0000184173980000231
therefore, the vibration equation of the voice coil (103) [ that is, the vibration equation of the diaphragm (102), since the diaphragm (102) and the voice coil (3) are connected together by the centering pad (104) ] is as follows:
Figure BSA0000184173980000232
Figure BSA0000184173980000241
Figure BSA0000184173980000251
(13) in the formula
Figure BSA0000184173980000252
And
Figure BSA0000184173980000253
two terms are the sound information reproduced by the moving-coil speaker, the other term is noise, ① in the formula (7) and the formula (13) are compared with
Figure BSA0000184173980000254
② and
Figure BSA0000184173980000255
therefore, the following steps are carried out: the amplitude-frequency distortion of the loudspeaker is reduced, but not completely eliminated.
If the input audio signal u (t) is subjected to third-order differential operation and then is added to a voice coil of a moving-coil loudspeaker:
second derivative of u (t)
Figure BSA0000184173980000256
Derivation was performed when n is 1, 2, 3, … … to yield:
Figure BSA0000184173980000257
when n is 1, 2, 3, … … and u' (t) is applied to the voice coil (103) at the time when t is 0, the steady-state current (containing information of the input audio signal) in the voice coil (103) is:
Figure BSA0000184173980000258
(this equation temporarily does not consider electromotive force Blv generated by voice coil motion)
A steady-state current i flows in the voice coil (103)3Ampere force to which it is subjected:
Figure BSA0000184173980000261
acceleration of voice coil (103):
Figure BSA0000184173980000262
speed of voice coil (103):
Figure BSA0000184173980000263
back electromotive force of the voice coil (103) due to cutting of magnetic induction lines:
Figure BSA0000184173980000264
taking into account the back electromotive force EInverse directionThe steady-state portion of the actual current in the voice coil (103) (containing information of the input audio signal) is:
Figure BSA0000184173980000265
ampere force to which voice coil (103) is subjected:
Figure BSA0000184173980000266
Figure BSA0000184173980000271
actual acceleration of voice coil (103):
Figure BSA0000184173980000272
the actual speed of the voice coil (103) is:
Figure BSA0000184173980000273
Figure BSA0000184173980000281
therefore, the vibration equation of the voice coil (103) [ i.e. the vibration equation of the diaphragm (102), since the diaphragm (102) and the voice coil (103) are connected together by the centering pad (104) ] is as follows:
Figure BSA0000184173980000282
Figure BSA0000184173980000291
Figure BSA0000184173980000301
(14) in the formula
Figure BSA0000184173980000302
And
Figure BSA0000184173980000303
two terms are the sound information reproduced by the moving-coil speaker, the other term is noise, ① in the formula (7) and the formula (14) are compared with
Figure BSA0000184173980000311
② and
Figure BSA0000184173980000312
therefore, the following steps are carried out: the amplitude-frequency distortion of the loudspeaker is further reduced; further, the results of the comparison between the formulas (13) and (14)
Figure BSA0000184173980000313
And
Figure BSA0000184173980000314
Figure BSA0000184173980000315
and
Figure BSA0000184173980000316
the amplitude of the loudspeaker is found to be better when the input audio signal is subjected to third-order differential operation than is subjected to second-order differential operation and then is added to the voice coil, so that the amplitude-frequency distortion of the loudspeaker is reduced.
From the above discussion it is clear that: for a moving-coil loudspeaker (driven by magnetic field force), input audio signals are subjected to first-order, second-order or third-order differential operation and then added to a voice coil of the loudspeaker, so that amplitude-frequency distortion of the loudspeaker can be reduced, but cannot be completely eliminated.
If the input audio signal u (t) is subjected to fourth order differential operation and then is added to the voice coil of the moving-coil loudspeaker:
will be provided with
Figure BSA0000184173980000317
And n is 1, 2, 3 and … …, and derivation is carried out to obtain:
Figure BSA0000184173980000318
n is 1, 2, 3, … …, and u is set to 0 at time t(4)(t) is applied to the voice coil (103), the steady state current (containing information of the input audio signal) in the voice coil (103) is:
Figure BSA0000184173980000319
(this equation temporarily does not consider electromotive force Blv generated by voice coil motion)
A steady-state current i flows in the voice coil (103)4Ampere force to which it is subjected:
Figure BSA00001841739800003110
acceleration of voice coil (103):
Figure BSA00001841739800003111
speed of voice coil (103):
Figure BSA00001841739800003112
back electromotive force of the voice coil (103) due to cutting of magnetic induction lines:
Figure BSA0000184173980000321
taking into account the back electromotive force EInverse directionThe steady-state portion of the actual current in the voice coil (103) (containing information of the input audio signal) is:
Figure BSA0000184173980000322
ampere force to which voice coil (103) is subjected:
Figure BSA0000184173980000323
actual acceleration of voice coil (103):
Figure BSA0000184173980000324
the actual speed of the voice coil (103) is:
Figure BSA0000184173980000331
Figure BSA0000184173980000341
therefore, the vibration equation of the voice coil (103) [ i.e. the vibration equation of the diaphragm (102), since the diaphragm (102) and the voice coil (103) are connected together by the centering pad (104) ] is as follows:
Figure BSA0000184173980000342
Figure BSA0000184173980000351
Figure BSA0000184173980000361
(15) in the formula
Figure BSA0000184173980000362
And
Figure BSA0000184173980000363
two terms are the sound information reproduced by the moving-coil speaker, the other term is noise, ① in the formula (7) and the formula (15) are compared with
Figure BSA0000184173980000364
② and
Figure BSA0000184173980000365
therefore, the following steps are carried out: since amplitude-frequency distortion of the speaker is reduced, the amplitude-frequency distortion of the speaker can also be reduced by performing a fourth order differential operation on the input audio signal u (t) and then applying the result to the voice coil.
If the input audio signal u (t) is subjected to fifth order differential operation and then is added to a voice coil of a moving-coil loudspeaker:
to pair
Figure BSA0000184173980000371
Where n is 1, 2, 3, … … derived, there are:
Figure BSA0000184173980000372
at the moment when t is 0, u is added(5)(t) is applied to the voice coil (103), the steady state current (containing information of the input audio signal) in the voice coil (103) is:
Figure BSA0000184173980000373
(this equation temporarily does not consider electromotive force Blv generated by voice coil motion)
A steady-state current i flows in the voice coil (103)5Ampere force to which it is subjected:
Figure BSA0000184173980000374
acceleration of voice coil (103):
Figure BSA0000184173980000375
speed of voice coil (103):
Figure BSA0000184173980000376
back electromotive force of the voice coil (103) due to cutting of magnetic induction lines:
Figure BSA0000184173980000377
taking into account the back electromotive force EInverse directionThe steady-state portion of the actual current in the voice coil (103) (containing information of the input audio signal) is:
Figure BSA0000184173980000381
ampere force to which voice coil (103) is subjected:
Figure BSA0000184173980000382
actual acceleration of voice coil (103):
Figure BSA0000184173980000383
the actual speed of the voice coil (103) is:
Figure BSA0000184173980000384
Figure BSA0000184173980000391
Figure BSA0000184173980000401
therefore, the vibration equation of the voice coil (103) [ i.e. the vibration equation of the diaphragm (102), since the diaphragm (102) and the voice coil (103) are connected together by the centering pad (104) ] is as follows:
Figure BSA0000184173980000402
Figure 1
Figure BSA0000184173980000421
(16) in the formula
Figure BSA0000184173980000422
And
Figure BSA0000184173980000423
two terms are the sound information reproduced by the loudspeaker, and the other term is noise. Comparing the equations (7) and (16) can find that the amplitude-frequency distortion of the loudspeaker is reduced, so that the amplitude-frequency distortion of the moving-coil loudspeaker can also be reduced by firstly carrying out fifth-order differential operation on the input audio signal and then adding the input audio signal to the voice coil.
Comparing the formulas (7), (12), (13), (14), (15) and (16) can find that: the output of the moving-coil loudspeaker comprises a phase angle of
Figure BSA0000184173980000424
And
Figure BSA0000184173980000425
the two terms of sound information and the differential operation of different orders on the input signal have different effects of reducing amplitude distortion for the two terms.
In summary, for the electrostatic speaker, the amplitude-frequency distortion of the speaker can be reduced by performing first, second or third order differential operation on the input audio signal and then adding the input audio signal to the fixed polar plate of the speaker, wherein the amplitude-frequency distortion of the speaker can be completely eliminated by performing the second order differential operation; for a moving-coil loudspeaker, input audio signals are subjected to first-order, second-order, third-order, fourth-order or fifth-order differential operation and then added to a voice coil of the loudspeaker, so that amplitude-frequency distortion of the loudspeaker can be reduced but cannot be completely eliminated, and the effect of the third-order differential operation is better.
The processing of the input audio signal by the electrostatic loudspeaker (driven by electrostatic force) and the moving coil loudspeaker (driven by magnetic force) finds: the amplitude-frequency distortion of the signal is caused by the integral operation and the differential operation, and the effects are just opposite (namely, the amplitude of the input signal is changed into n omega times by the differential operation, and the amplitude of the input signal is changed into the original by the integral operation
Figure BSA0000184173980000431
) And all of them are related to the frequency of the input signal, such as the increasing process (integral operation) of the voltage between two fixed polar plates (303) of the electrostatic loudspeaker, the accelerating process (integral operation) of the motion of the diaphragm (304), the increasing process (integral operation) of the current of the voice coil (103) in the moving-coil loudspeaker, the accelerating process (integral operation) of the motion of the voice coil (103), etc. it can be seen that the integral operation exists in both the electrostatic loudspeaker and the moving-coil loudspeaker, and the integral operation is indispensable and is the work source of the integral operationAs necessary. Since the differentiation is the inverse of the integration, the amplitude-frequency distortion generated by the integration can be corrected by performing appropriate differentiation on the input audio signal (i.e. pre-compensating the amplitude-frequency distortion generated by the integration, and compensating the distortion by using the 'inverse distortion', because the distortion cannot be remedied once finally appearing in the vibration of the diaphragm) and then applying the amplitude-frequency distortion to the loudspeaker. Therefore, the essence of the technical scheme of the invention is as follows: since the amplitude-frequency distortion generated by the integration operation of the audio signal by the speaker (such an integration operation is necessary), the amplitude-frequency distortion generated by the integration operation needs to be corrected by performing an appropriate differentiation operation on the audio signal (i.e., "precompensating" the input audio signal). Such a differential operation may be implemented by hardware or software.
Since the differential operation on the input audio signal is independent of other processing processes (such as amplification, filtering, etc.) on the signal, no matter the sound system is composed of an electrostatic speaker (driven by electrostatic force) or a moving-coil speaker (driven by magnetic field force), the differential operation on the input signal is specifically carried out on which link in the sound system, and the final effect of reducing the distortion of the speaker cannot be influenced. For example, for an electrostatic speaker, the "differential operation" may be performed on a signal transmission path between the audio transformer and the two fixed plates, or may be implemented by integrating the "differential operation" inside the audio transformer.
The audio signal amplifier in the sound system is generally multi-stage amplification, in this case, one or some stages of differential operation on the input audio signal can be integrated in one or some stages of the audio signal amplifier, and the final effect of reducing the amplitude-frequency distortion of the signal by the differential operation is not influenced.
Comparing the electrostatic speaker with the moving-coil speaker, the amplitude-frequency distortion of the speaker can be reduced by performing an appropriate "order" differential operation on the input audio signal, but the effect is different: the amplitude-frequency distortion of the electrostatic loudspeaker can be completely eliminated theoretically; although amplitude-frequency distortion can be reduced for moving-coil speakers, it cannot be completely eliminated. This is because the processing of the audio signal by the moving-coil speaker is more complicated: the voice coil inductance can distort the signal, and the voice coil motion cuts the magnetic induction lines to generate back electromotive force, so that the signal can be distorted. It can be considered that: the amplitude-frequency distortion of all loudspeakers driven by magnetic field force is serious because as long as the conductor and the magnetic field have relative motion (cutting magnetic induction lines), back electromotive force (the electromotive force is related to the signal frequency) is generated, thereby generating the amplitude-frequency distortion. In contrast, the electrostatic loudspeaker is not only simple in structure but also free of magnetic field and driven by electrostatic force, and has no problem of back electromotive force, so that amplitude-frequency distortion is smaller. It can be seen that the electrostatic speaker has inherent advantages in terms of working principle compared with a moving-coil speaker (driven by magnetic field force), so that the electrostatic speaker has better effect in a high-fidelity sound system.
For a moving-coil loudspeaker, the diaphragm can be made into different shapes according to the requirements, and the shapes are as follows: cone-basin loudspeakers, dome loudspeakers, horn loudspeakers, flat loudspeakers, etc., wherein the flat loudspeakers are different from common electrostatic loudspeakers which are also flat, and the flat loudspeakers are still moving-coil loudspeakers, in which a vibrating diaphragm is made into a flat plate shape and then fixed with a voice coil, and the voice coil drives the flat vibrating diaphragm to vibrate to generate sound when vibrating. In addition, there is a tape speaker, which is a strip-shaped metal foil (usually aluminum foil) placed in a magnetic field, and when audio current is passed through the tape speaker, the tape speaker vibrates under the action of the magnetic field force to generate sound, and in fact, the tape speaker is not essentially different from the moving coil speaker, where the strip-shaped metal foil is equivalent to "voice coil plus diaphragm", which is equivalent to extending the voice coil wire to form a tape, and simultaneously acts as a diaphragm, and the electromagnetic performance is similar to that of a voice coil, and there are resistance and inductance, but its resistance and inductance are relatively small, so its phase distortion and amplitude distortion are relatively small, but its efficiency is relatively low.
Therefore, cone speakers, dome speakers, horn speakers, flat panel speakers, and band speakers have different shapes, but have the same working principle, and are driven by magnetic force: when audio current flows through the conductor, the sound is generated by vibration under the action of magnetic field force, and the sound belongs to moving-coil loudspeakers, so that the technical scheme of the invention is suitable for the loudspeakers.
Description of the drawings:
[ numbering rules of the drawings: the figure number "+" the element number, two digits from the right, the same number representing the same element
Fig. 1 is a schematic structural diagram of a moving-coil speaker in the prior art.
Fig. 2 is a schematic diagram of a prior art moving coil speaker.
Fig. 3 is a schematic diagram of a prior art electrostatic speaker.
FIG. 4 is a schematic view of example 1.
FIG. 5 is a schematic view of example 2.
FIG. 6 is a schematic view of example 3.
FIG. 7 is a schematic view of example 4.
FIG. 8 is a schematic view of example 5.
FIG. 9 is a schematic view of example 6.
FIG. 10 is a schematic view of example 7.
FIG. 11 is a schematic view of example 8.
FIG. 12 is a schematic view of example 9.
FIG. 13 is a schematic view of example 10.
FIG. 14 is a schematic view of example 11.
FIG. 15 is a schematic view of example 12.
FIG. 16 is a schematic view of example 13.
FIG. 17 is a schematic view of example 14.
FIG. 18 is a schematic view of example 15.
FIG. 19 is a schematic view of example 16.
FIG. 20 is a schematic view of example 17.
FIG. 21 is a schematic view of example 18.
FIG. 22 is a schematic view of example 19.
FIG. 23 is a schematic view of example 20.
FIG. 24 is a schematic view of example 21.
FIG. 25 is a schematic view of example 22.
FIG. 26 is a schematic view of example 23.
FIG. 27 is a schematic view of example 24.
FIG. 28 is a schematic view of example 25.
FIG. 29 is a schematic view of example 26.
FIG. 30 is a schematic view of example 27.
The specific implementation mode is as follows: in order to make the technical solutions of the present invention easier for those skilled in the art to understand, the following embodiments further illustrate:
example 1: the present invention provides an electrostatic speaker, as shown in fig. 4, including: the device comprises an audio transformer (301), a first-order differential operation module (401), a high-voltage direct-current power supply (302), two fixed polar plates (303) and a diaphragm (304); the audio transformer (301) boosts an input audio signal, the high-voltage direct-current power supply (302) provides net charges for the diaphragm (304), the diaphragm (304) is located between the two fixed polar plates (303), the first-order differential operation module (401) has a function of performing first-order differential operation on the signal, and the first-order differential operation function of the first-order differential operation module (401) can be realized by hardware or software; an input audio signal is boosted by the audio transformer (301) and then subjected to first-order differential operation by the first-order differential operation module (401), a signal output by the first-order operation module (401) is added to the two fixed polar plates (303) to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of an electric field force applied by the variable electric field.
The first order differential operation module (401) in this embodiment may also be integrated with the audio transformer (301), so that the first order differential operation function of the first order differential operation module (401) is implemented inside the audio transformer (301).
Example 2: the present invention provides an electrostatic speaker, as shown in fig. 5, including: the device comprises an audio transformer (301), a second-order differential operation module (501), a high-voltage direct-current power supply (302), two fixed polar plates (303) and a diaphragm (304); the high-voltage direct current power supply (302) provides net charges (also belonging to static charges) for the diaphragm (304), the diaphragm (304) is located between the two fixed polar plates (303), the second-order differential operation module (501) has a function of performing second-order differential operation on signals, the second-order differential operation function of the second-order differential operation module (501) can be realized by hardware or software, input audio signals are boosted by the audio transformer (301) and then subjected to second-order differential operation by the second-order differential operation module (501), signals output by the second-order differential operation module (501) are added to the two fixed polar plates (303) so as to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of an electric field force applied by the variable electric field.
The second order differential operation module (501) in this embodiment may also be integrated with the audio transformer (301), so that the second order differential operation function of the second order differential operation module (501) is implemented inside the audio transformer (301).
Example 3: an electrostatic speaker according to the present invention, as shown in fig. 6, includes: the device comprises an audio transformer (301), a third-order differential operation module (601), a high-voltage direct-current power supply (302), two fixed polar plates (303) and a diaphragm (304); the high-voltage direct-current power supply (302) provides net charges (also belonging to static charges) for the diaphragm (304), the diaphragm (304) is arranged between the two fixed polar plates (303), the third-order differential operation module (601) has a function of performing third-order differential operation on signals, the third-order differential operation function of the third-order differential operation module (601) can be realized by hardware or software, input audio signals are boosted by the audio transformer (301) and then subjected to third-order differential operation by the third-order differential operation module (601), signals output by the third-order differential operation module (601) are added on the two fixed polar plates (303) so as to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of an electric field force applied by the variable electric field.
The third-order differential operation module (601) in this embodiment may also be integrated with the audio transformer (301), so that the third-order differential operation function of the third-order differential operation module (601) is implemented inside the audio transformer (301).
Example 4: an electrostatic speaker according to the present invention, as shown in fig. 7, includes: the device comprises a first-order differential operation module (401), an audio transformer (301), a high-voltage direct-current power supply (302), two fixed polar plates (303) and a diaphragm (304); the high-voltage direct current power supply (302) provides net charges (also belonging to static charges) for the diaphragm (304), the diaphragm (304) is positioned between the two fixed polar plates (303), the first-order differential operation module (401) has a function of performing first-order differential operation on signals, and the first-order differential operation function of the first-order differential operation module (401) can be realized by hardware or software; an input audio signal is subjected to first-order differential operation by the first-order differential operation module (401) and then is boosted by the audio transformer (301), a signal output by the audio transformer (301) is added to the two fixed polar plates (303) so as to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of an electric field force applied by the variable electric field.
The first order differential operation module (401) in this embodiment may also be integrated with the audio transformer (301), so that the first order differential operation function of the first order differential operation module (401) is implemented inside the audio transformer (301).
Example 5: an electrostatic speaker according to the present invention, as shown in fig. 8, includes: the device comprises two first-order differential operation modules (401), an audio transformer (301), a high-voltage direct-current power supply (302), two fixed polar plates (303) and a diaphragm (304); the high-voltage direct current power supply (302) provides net charges (also belonging to static charges) for the diaphragm (304), the diaphragm (304) is positioned between the two fixed polar plates (303), the first-order differential operation module (401) has a function of performing first-order differential operation on signals, and the first-order differential operation function of the first-order differential operation module (401) can be realized by hardware or software; an input audio signal is subjected to first-order differential operation by one of the first-order differential operation modules (401) and then is applied to the signal input end of the audio transformer (301), a signal output by the audio transformer (301) is subjected to first-order differential operation by the other first-order differential operation module (401) and then is applied to the two fixed polar plates (303), so that a variable electric field is formed between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of an electric field force applied by the variable electric field.
One or both of the two first order differential operation modules (401) in this embodiment may also be integrated with the audio transformer (301), so that the differential operation function of the first order differential operation module (401) is implemented inside the audio transformer (301).
Example 6: an electrostatic speaker according to the present invention, as shown in fig. 9, includes: the device comprises an audio transformer (301), a high-voltage direct current power supply (302), a second-order differential circuit (901), two fixed polar plates (303) and a diaphragm (304); the second order differential circuit (901) has a function of performing second order differential operation on a signal, the second order differential circuit (901) is integrated on one of the fixed polar plates (303), the high-voltage direct current power supply (302) provides net charge (also belonging to static charge) for the diaphragm (304), and the diaphragm (304) is positioned between the two fixed polar plates (303); an input audio signal is boosted by the audio transformer (301), subjected to second-order differential operation by the second-order differential circuit (901) and then added to the two fixed polar plates (303), so that a variable electric field is formed between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of an electric field force applied by the variable electric field.
Example 7: an apparatus for processing voice information, as shown in fig. 10, includes: a first order differential operation module (401), an audio signal amplifier and an electrostatic speaker; the first order differential operation module (401) has a function of performing first order differential operation on a signal, the first order differential operation function of the first order differential operation module (401) can be realized by hardware or software, an input audio signal is subjected to first order differential operation by the first order differential operation module (401) and then is added to a signal input end of the audio signal amplifier, and a signal output by the audio signal amplifier is added to a signal input end of the electrostatic loudspeaker so as to enable the electrostatic loudspeaker to generate sound; the first order differential operation module (401) in the present embodiment may also be implemented integrally within the audio signal amplifier.
Example 8: an apparatus for processing voice information according to the present invention, as shown in fig. 11, includes: two first order differential operation modules (401), an audio signal amplifier and an electrostatic loudspeaker; the first order differential operation module (401) has a function of performing first order differential operation on signals, the first order differential operation function of the first order differential operation module (401) can be realized by hardware or software, an input audio signal is subjected to first order differential operation by one of the first order differential operation modules (401) and then is added to the signal input end of the audio signal amplifier, and a signal output by the audio signal amplifier is subjected to first order differential operation by the other one of the first order differential operation modules (401) and then is added to the signal input end of the electrostatic speaker so as to enable the electrostatic speaker to generate sound; two or one of the first order differential operation modules (401) in the present embodiment may also be implemented integrally within the audio signal amplifier.
Example 9: an apparatus for processing voice information according to the present invention, as shown in fig. 12, includes: the device comprises a second-order differential operation module (501), an audio signal amplifier and an electrostatic loudspeaker; the second order differential operation module (501) has a function of performing second order differential operation on a signal, the second order differential operation function of the second order differential operation module (501) can be realized by hardware or software, an input audio signal is subjected to second order differential operation by the second order differential operation module (501) and then is transmitted to a signal input end of the audio signal amplifier, and a signal output by the audio signal amplifier is added to a signal input end of the electrostatic loudspeaker so as to enable the electrostatic loudspeaker to generate sound; the second order differential operation module (501) in the present embodiment can also be integrated inside the audio signal amplifier.
Example 10: an apparatus for processing voice information, as shown in fig. 13, includes: the device comprises an audio signal amplifier, a second-order differential operation module (501) and an electrostatic loudspeaker; the second order differential operation module (501) has a function of performing second order differential operation on signals, the second order differential operation function of the second order differential operation module (501) can be realized by hardware or software, input audio signals are amplified by the audio signal amplifier and then are added to the signal input end of the second order differential operation module (501), and signals output by the second order differential operation module (501) are added to the signal input end of the electrostatic loudspeaker so as to enable the electrostatic loudspeaker to generate sound; the second order differential operation module (501) in the present embodiment can also be integrated inside the audio signal amplifier.
Example 11: the present invention provides a device for processing voice information, as shown in fig. 14, including: the device comprises an audio signal amplifier, a third-order differential operation module (601) and an electrostatic loudspeaker; the third-order differential operation module (601) has a function of performing third-order differential operation on signals, the third-order differential operation function of the third-order differential operation module (601) can be realized by hardware or software, an input audio signal is amplified by the audio signal amplifier and then is added to the signal input end of the third-order differential operation module (601), and the signal output by the third-order differential operation module (601) is added to the signal input end of the electrostatic loudspeaker so as to enable the electrostatic loudspeaker to generate sound; the third order differential operation module (601) in the present embodiment can also be integrated inside the audio signal amplifier.
Example 12: an apparatus for processing voice information according to the present invention, as shown in fig. 15, includes: the device comprises a first-order differential operation module (401), an audio signal amplifier, a second-order differential operation module (501) and an electrostatic loudspeaker; the first order differential operation module (401) has a function of performing first order differential operation on signals, the second order differential operation module (501) has a function of performing second order differential operation on signals, the differential operation functions of the first order differential operation module (401) and the second order differential operation module (501) can be realized by hardware or software, input audio signals are subjected to first order differential operation by the first order differential operation module (401) and then are added to the signal input end of the audio signal amplifier, signals output by the audio signal amplifier are subjected to second order differential operation by the second order differential operation module (501), and signals output by the second order differential operation module (501) are added to the signal input end of the electrostatic loudspeaker so as to enable the electrostatic loudspeaker to generate sound; the positions of the first order differential operation module (401) and the second order differential operation module (501) in the system can be interchanged; the first order differential operation module (401) and the second order differential operation module (501) or one of the first order differential operation module and the second order differential operation module can be integrated in the audio signal amplifier for realization.
Example 13: an apparatus for processing voice information according to the present invention, as shown in fig. 16, includes: the device comprises an audio signal amplifier, a first-order differential operation module (401) and a moving-coil loudspeaker; the first order differential operation module (401) has a function of performing first order differential operation on signals, the first order differential operation function of the first order differential operation module (401) can be realized by hardware or software, an input audio signal is amplified by the audio signal amplifier and then is added to a signal input end of the first order differential operation module (401), and a signal output by the first order differential operation module (401) is added to a signal input end of the moving coil loudspeaker so as to enable the electrostatic loudspeaker to generate sound; the first order differential operation module (401) in the present embodiment may also be implemented integrally within the audio signal amplifier.
Example 14: an apparatus for processing voice information according to the present invention, as shown in fig. 17, includes: the device comprises an audio signal amplifier, a second-order differential operation module (501) and a moving-coil loudspeaker; the second order differential operation module (501) has a function of performing second order differential operation on signals, the second order differential operation function of the second order differential operation module (501) can be realized by hardware or software, input audio signals are amplified by the audio signal amplifier and then are added to the signal input end of the second order differential operation module (501), and signals output by the second order differential operation module (501) are added to the signal input end of the moving coil loudspeaker so that the moving coil loudspeaker generates sound; the second order differential operation module (501) in the present embodiment can also be integrated inside the audio signal amplifier.
Example 15: an apparatus for processing voice information according to the present invention, as shown in fig. 18, includes: two first order differential operation modules (401), an audio signal amplifier and a moving coil loudspeaker; the two first-order differential operation modules (401) have the function of performing first-order differential operation on signals, the first-order differential operation function of the two first-order differential operation modules (401) can be realized by hardware or software, an input audio signal is subjected to first-order differential operation through one of the first-order differential operation modules (401) and then is added to the signal input end of the audio signal amplifier, and a signal output by the audio signal amplifier is subjected to first-order differential operation through the other first-order differential operation module (401) and then is added to the signal input end of the moving coil loudspeaker, so that the moving coil loudspeaker generates sound; in this embodiment, one or both of the two first order differential operation modules (401) may also be implemented inside the audio signal amplifier.
Example 16: an apparatus for processing voice information according to the present invention, as shown in fig. 19, includes: the device comprises an audio signal amplifier, a third-order differential operation module (601) and a moving-coil loudspeaker; the third-order differential operation module (601) has a function of performing third-order differential operation on signals, the third-order differential operation function of the third-order differential operation module (601) can be realized by hardware or software, an input audio signal is amplified by the audio signal amplifier and then is added to the signal input end of the third-order differential operation module (601), and the signal output by the third-order differential operation module (601) is added to the signal input end of the moving-coil loudspeaker so as to enable the moving-coil loudspeaker to generate sound; the third order differential operation module (601) in the present embodiment can also be integrated inside the audio signal amplifier.
Example 17: an apparatus for processing voice information according to the present invention, as shown in fig. 20, includes: the device comprises a third-order differential operation module (601), an audio signal amplifier and a moving-coil loudspeaker; the third-order differential operation module (601) has a function of performing third-order differential operation on signals, the third-order differential operation function of the third-order differential operation module (601) can be realized by hardware or software, an input audio signal is subjected to third-order differential operation by the third-order differential operation module (601) and then is added to a signal input end of the audio signal amplifier, and a signal output by the audio signal amplifier is added to a signal input end of the moving-coil loudspeaker so as to enable the moving-coil loudspeaker to generate sound; the third order differential operation module (601) in the present embodiment can also be integrated inside the audio signal amplifier.
Example 18: an apparatus for processing voice information according to the present invention, as shown in fig. 21, includes: the device comprises a first-order differential operation module (401), an audio signal amplifier, a second-order differential operation module (501) and a belt type loudspeaker; the first order differential operation module (401) has a function of performing first order differential operation on signals, the second order differential operation module (501) has a function of performing second order differential operation on signals, the differential operation functions of the first order differential operation module (401) and the second order differential operation module (501) can be realized by hardware or software, input audio signals are subjected to first order differential operation by the first order differential operation module (401) and then are added to the signal input end of the audio signal amplifier, signals output by the audio signal amplifier are subjected to second order differential operation by the second order differential operation module (501) and then are added to the signal input end of the belt type loudspeaker, and therefore the belt type loudspeaker generates sound; the first order differential operation module (401) and the second order differential operation module (501) or one of them in the embodiment can also be integrated inside the audio signal amplifier for realization.
Example 19: an apparatus for processing voice information according to the present invention, as shown in fig. 22, includes: the device comprises an audio signal amplifier, a fourth-order differential operation module (2201) and a moving-coil loudspeaker; the fourth order differential operation module (2201) has a function of performing fourth order differential operation on signals, the fourth order differential operation function of the fourth order differential operation module (2201) can be realized by hardware or software, an input audio signal is amplified by the audio signal amplifier and then is added to a signal input end of the fourth order differential operation module (2201), and the signal output by the fourth order differential operation module (2201) is added to a signal input end of the moving coil loudspeaker so as to enable the moving coil loudspeaker to generate sound; the fourth order differential operation module (2201) in the present embodiment can also be integrated inside the audio signal amplifier.
Example 20: an apparatus for processing voice information according to the present invention, as shown in fig. 23, includes: the device comprises two second-order differential operation modules (501), an audio signal amplifier and a moving-coil loudspeaker; the second order differential operation module (501) has a function of performing second order differential operation on signals, the second order differential operation function of the second order differential operation module (501) can be realized by hardware or software, an input audio signal is subjected to second order differential operation by one second order differential operation module (501) and then is added to the signal input end of the audio signal amplifier, and a signal output by the audio signal amplifier is subjected to second order differential operation by the other second order differential operation module (501) and then is added to the signal input end of the moving coil loudspeaker, so that the moving coil loudspeaker generates sound; the two second order differential operation modules (501) in the embodiment can also be integrated inside the audio signal amplifier for implementation.
Example 21: an apparatus for processing voice information according to the present invention, as shown in fig. 24, includes: the device comprises an audio signal amplifier, a fifth-order differential operation module (2401) and a moving-coil loudspeaker; the five-order differential operation module (2401) has a function of performing five-order differential operation on signals, the five-order differential operation function of the five-order differential operation module (2401) can be realized by hardware or software, an input audio signal is amplified by the audio signal amplifier and then is added to a signal input end of the five-order differential operation module (2401), and the signal output by the five-order differential operation module (2401) is added to a signal input end of the moving coil loudspeaker so that the moving coil loudspeaker generates sound; the fifth order differential operation module (2401) in this embodiment may also be integrated inside the audio signal amplifier.
Example 22: an apparatus for processing voice information according to the present invention, as shown in fig. 25, includes: the device comprises a second-order differential operation module (501), an audio signal amplifier, a third-order differential operation module (601) and a moving-coil loudspeaker; the second order differential operation module (501) has a function of performing second order differential operation on a signal, the third order differential operation module (601) has a function of performing third order differential operation on the signal, the differential operation functions of the second order differential operation module (501) and the third order differential operation module (601) can be realized by hardware or software, an input audio signal is subjected to second order differential operation by the second order differential operation module (501) and then added to the signal input end of the audio signal amplifier, and a signal output by the audio signal amplifier is subjected to third order differential operation by the third order differential operation module (601) and then added to the signal input end of the moving coil loudspeaker, so that the moving coil loudspeaker generates sound; the second order differential operation module (501) and the third order differential operation module (601) or one of them in the embodiment can also be integrated inside the audio signal amplifier for implementation.
Example 23: a communication apparatus according to the present invention, as shown in fig. 26, includes: the device comprises a memory, a digital-to-analog conversion module (D/A conversion module), an audio signal amplifier, a second-order differential operation module and an electrostatic loudspeaker; the memory can temporarily 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 second-order differential operation module has a function of performing second-order differential operation on the analog audio signals, and the second-order differential operation function of the second-order differential operation module can be realized 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, and the analog audio signal output by the audio signal amplifier is subjected to second-order differential operation by the second-order differential operation module and then is added to the signal input end of the electrostatic loudspeaker, so that the electrostatic loudspeaker produces sound.
The second-order differential module in this embodiment may be replaced with a first-order or third-order differential operation module, and the differential operation function of the first-order or third-order differential operation module may be implemented by hardware or software.
Example 24: a communication apparatus according to the present invention, as shown in fig. 27, includes: the device comprises a memory, a digital-to-analog conversion module (D/A conversion module), an audio signal amplifier, a third-order differential operation module and a moving-coil loudspeaker; the memory can store digital audio signals, and 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 differential operation module has a function of performing third-order differential operation on the analog audio signal output by the digital-to-analog conversion module, and the third-order differential operation function of the third-order differential operation module can be realized 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, and the analog audio signal output by the audio signal amplifier is subjected to third-order differential operation by the third-order differential operation module and then added to the signal input end of the moving-coil loudspeaker, so that the moving-coil loudspeaker generates sound.
The third-order differential operation module in this embodiment may be replaced with a first-order, second-order, fourth-order, or fifth-order differential operation module, and the differential operation function of the first-order, second-order, fourth-order, or fifth-order differential operation module may be implemented by hardware or software.
Example 25: a communication apparatus according to the present invention, as shown in fig. 28, includes: the device comprises an acoustoelectric conversion module, a second-order differential operation module, an analog-to-digital conversion module (A/D conversion module), a carrier generator, a modulator, a signal amplifier and an antenna; the sound-electricity conversion module converts voice information generated by an audio information source into corresponding analog audio-electricity signals; the second-order differential operation module has a function of performing second-order differential operation on the analog audio electrical signal, and the second-order differential operation function of the second-order differential operation module can be realized by 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 for generating a high-frequency carrier (the frequency is generally 800 MHz-2500 MHz and is convenient for remote transmission), and the modulator can calculate a digital audio signal to be sent and the carrier so that the calculated carrier contains information of the digital audio signal; the signal amplifier amplifies the modulated wave output by the modulator to reach enough power for transmission, and the modulated carrier wave (containing the information of the digital audio signal) is converted into electromagnetic wave through the antenna and is transmitted.
The second-order differential operation module in this embodiment may be replaced with a first-order, third-order, fourth-order, or fifth-order differential operation module, and the differential operation function of the first-order, third-order, fourth-order, or fifth-order differential operation module may be implemented by hardware or software.
Example 26: a communication apparatus according to the present invention, as shown in fig. 29, includes: the system comprises an antenna, a primary signal amplifier, a demodulator, a digital-to-analog conversion module (D/A conversion module), a second-order differential operation module, a final-stage signal amplifier and an electrostatic loudspeaker; the antenna is used for receiving electromagnetic waves transmitted from the space, the primary signal amplifier amplifies weak electric signals received by the antenna, the demodulator restores digital audio signals sent by a sending end from received modulated waves, and the digital-to-analog conversion module (D/A conversion module) converts the digital audio signals restored by the demodulator into corresponding analog audio signals; the second order differential operation module has a function of performing second order differential operation on the analog audio signal, and the function of the second order differential operation module can be realized by hardware or software; the analog audio signal is subjected to second-order differential operation by the second-order differential operation module and then amplified by the final-stage signal amplifier, and a signal output by the final-stage signal amplifier is added to a signal input end of the electrostatic loudspeaker, so that the electrostatic loudspeaker generates sound.
The second order differential operation module in this embodiment may be replaced with a module having a first order or third order differential operation function, and the differential operation function of the module having the first order or third order differential operation function may be implemented by hardware or software.
Example 27: a communication apparatus according to the present invention, as shown in fig. 30, includes: the device comprises an antenna, a primary signal amplifier, a demodulator, a digital-to-analog conversion module (D/A conversion module), a third-order differential operation module, a final-stage signal amplifier and a moving-coil loudspeaker; the antenna is used for receiving electromagnetic waves transmitted from the space, the primary signal amplifier is used for amplifying weak electric signals (the voltage of the weak electric signals is generally mV or mu V level) received by the antenna, the demodulator restores digital audio signals sent by a sending end from received modulated waves, and the digital-to-analog conversion module (D/A conversion module) converts the digital audio signals restored by the demodulator into corresponding analog audio signals; the third-order differential operation module has a function of performing third-order differential operation on the analog audio signal, and the differential operation function of the third-order differential operation module can be realized by hardware or software; the analog audio signal is subjected to third-order differential operation by the third-order differential operation module and then amplified by the final-stage signal amplifier, and the analog audio signal output by the final-stage signal amplifier is added to the signal input end of the moving-coil loudspeaker, so that the moving-coil loudspeaker generates sound.
The third-order differential operation module in this embodiment may be replaced with a module having a first-order, second-order, fourth-order, or fifth-order differential operation function, and the differential operation function of the module having the first-order, second-order, fourth-order, or fifth-order differential operation function may be implemented by hardware or software.
The foregoing embodiments are described in terms of specific implementations, so that those skilled in the art can more clearly and accurately understand the core idea of the technical solution of the present invention, and as a person skilled in the art can make appropriate equivalent changes and rearrangements on the embodiments to achieve the same technical effects without changing the core idea of the technical solution of the present invention, the embodiments should not be taken as limitations to the present invention, and the scope of protection claimed by the present invention is subject to the scope defined by the claims.

Claims (68)

1. An electrostatic loudspeaker comprising an audio transformer (301), a high voltage dc power supply (302), two fixed plates (303) and a diaphragm (304), characterized in that: performing a second order differential operation on an input audio signal before the input signal is transmitted to two fixed plates (303) of the electrostatic speaker; the audio transformer (301) boosts the input signal, the high-voltage direct current power supply (302) provides a net charge to the diaphragm (304), and the diaphragm (304) is located between the two fixed plates (303); the signal after the second order differential operation is added on the two fixed polar plates (303) so as to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of the electric field force applied by the variable electric field.
2. An electrostatic loudspeaker comprising an audio transformer (301), a high voltage dc power supply (302), two fixed plates (303) and a diaphragm (304), characterized in that: a module having a function of performing second order differential operation on an input audio signal is present in the electrostatic speaker; the second order differential operation function of the module can be realized by hardware or software, the audio transformer (301) boosts the input signal, the high-voltage direct current power supply (302) provides net charge for the diaphragm (304), and the diaphragm (304) is positioned between the two fixed polar plates (303); the signal subjected to second order differential operation by the module is added on the two fixed polar plates (303) so as to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of the electric field force applied by the variable electric field.
3. An electrostatic loudspeaker according to claim 2, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the electrostatic speaker to the two fixed plates (303).
4. An electrostatic loudspeaker according to claim 2, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the electrostatic speaker to a signal input terminal of the audio transformer (301).
5. An electrostatic loudspeaker according to claim 2, wherein: the module is located on a transmission path of the input signal, wherein the transmission path is a path through which the input signal is transmitted from a signal output end of the audio transformer (301) to the two fixed polar plates (303).
6. An electrostatic loudspeaker according to claim 2, wherein: the module is located inside the audio transformer (301).
7. An electrostatic loudspeaker comprising an audio transformer (301), a high voltage dc power supply (302), two fixed plates (303) and a diaphragm (304), characterized in that: -an n-order differential operation is performed on the input audio signal before it is transmitted to the two fixed plates (303) of the electrostatic loudspeaker, the n-order differential operation comprising only one or three order differential operations; the audio transformer (301) boosts the input signal, the high-voltage direct current power supply (302) provides a net charge to the diaphragm (304), and the diaphragm (304) is located between the two fixed plates (303); the signal after the n-order differential operation is added on the two fixed polar plates (303) so as to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of the electric field force applied by the variable electric field.
8. An electrostatic loudspeaker comprising an audio transformer (301), a high voltage dc power supply (302), two fixed plates (303) and a diaphragm (304), characterized in that: a module having a function of performing an n-order differential operation on an input audio signal is present in the electrostatic speaker, the n-order differential operation including only a first-order or a third-order differential operation; the differential operation function of the module can be realized by hardware or software, the audio transformer (301) boosts the input signal, the high-voltage direct current power supply (302) provides net charge for the diaphragm (304), and the diaphragm (304) is positioned between the two fixed polar plates (303); the signal differentiated by the module is added to the two fixed polar plates (303) so as to form a variable electric field between the two fixed polar plates (303), and the diaphragm (304) vibrates to generate sound under the action of the electric field force applied by the variable electric field.
9. An electrostatic loudspeaker according to claim 8, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the electrostatic speaker to the two fixed plates (303).
10. An electrostatic loudspeaker according to claim 8, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the electrostatic speaker to a signal input terminal of the audio transformer (301).
11. An electrostatic loudspeaker according to claim 8, wherein: the module is located on a transmission path of the input signal, wherein the transmission path is a path through which the input signal is transmitted from a signal output end of the audio transformer (301) to the two fixed polar plates (303).
12. An electrostatic loudspeaker according to claim 8, wherein: the module is located inside the audio transformer (301).
13. An apparatus for processing an audio signal, comprising an audio signal amplifier, an electrostatic speaker, characterized in that: performing a second order differential operation on an input audio signal before the input audio signal is transmitted to two fixed plates of the electrostatic speaker; the audio signal amplifier amplifies the input signal, and the input signal subjected to second-order differential operation is applied to two fixed polar plates of the electrostatic loudspeaker to make the electrostatic loudspeaker produce sound.
14. An apparatus for processing an audio signal, comprising an audio signal amplifier, an electrostatic speaker, characterized in that: a module having a function of performing a second order differential operation on an input audio signal is present in the apparatus; the second order differential operation function of the module can be realized by hardware or software, and the audio signal amplifier amplifies the input signal; the input signal is transmitted to the two fixed polar plates of the electrostatic loudspeaker from the signal input end of the device, second-order differential operation is carried out through the module, and when the input signal is transmitted to the two fixed polar plates of the electrostatic loudspeaker, the electrostatic loudspeaker generates sound.
15. The apparatus of claim 14, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input of the device to two fixed plates (303) of the electrostatic speaker.
16. The apparatus of claim 14, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the apparatus to a signal input terminal of the audio signal amplifier.
17. The apparatus of claim 14, wherein: the module is located on a transmission path of the input signal, and the transmission path is a path through which the input signal is transmitted from a signal output end of the audio signal amplifier to two fixed polar plates (303) of the electrostatic speaker.
18. The apparatus of claim 14, wherein: the module is located inside the audio signal amplifier.
19. An apparatus for processing an audio signal, comprising an audio signal amplifier, an electrostatic speaker, characterized in that: performing an n-order differential operation on an input audio signal before the input audio signal is transmitted to a signal input terminal of the electrostatic speaker, the n-order differential operation including only a first-order or a third-order differential operation; the audio signal amplifier amplifies the input signal, and the input signal subjected to the n-order differential operation is applied to a fixed polar plate of the electrostatic loudspeaker, so that the electrostatic loudspeaker produces sound.
20. An apparatus for processing an audio signal, comprising an audio signal amplifier, an electrostatic speaker, characterized in that: a module having a function of performing an n-order differential operation on an input audio signal is present in the device, the n-order differential operation including only a first-order or a third-order differential operation; the differential operation function of the module can be realized by hardware or software, and the audio signal amplifier amplifies the input signal; the input signal differentiated by the module is transmitted to the two fixed polar plates of the electrostatic loudspeaker, so that the electrostatic loudspeaker generates sound.
21. The apparatus of claim 20, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input of the device to two fixed plates (303) of the electrostatic speaker.
22. The apparatus of claim 20, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the apparatus to a signal input terminal of the audio signal amplifier.
23. The apparatus of claim 20, wherein: the module is located on a transmission path of the input signal, which is a path through which the input signal is transmitted from a signal output end of the audio transformer (301) to two fixed plates (303) of the electrostatic speaker.
24. The apparatus of claim 20, wherein: the module is located inside the audio signal amplifier.
25. The utility model provides a moving coil loudspeaker, includes magnet, voice coil loudspeaker voice coil, centering branch piece and vibrating diaphragm, its characterized in that: performing a third order differential operation on an input audio signal prior to transmission of said signal to said voice coil; the voice coil is positioned in a magnetic field generated by the magnet, the voice coil, the vibrating diaphragm and the centering support are connected together, and the centering support maintains the voice coil to move only along the axial direction; when the signal after the third-order differential operation passes through the voice coil, the voice coil vibrates under the action of magnetic field force so as to drive the vibrating diaphragm to vibrate to generate sound.
26. The utility model provides a moving coil loudspeaker, includes magnet, voice coil loudspeaker voice coil, centering branch piece and vibrating diaphragm, its characterized in that: a module with a function of performing third-order differential operation on an input audio signal is arranged in the moving-coil loudspeaker; the third-order differential operation function of the module can be realized by hardware or software, the voice coil is positioned in a magnetic field generated by the magnet, the voice coil, the vibrating diaphragm and the centering support piece are connected together, and the centering support piece maintains the voice coil to move only along the axial direction; when the input signal subjected to the third-order differential operation by the module passes through the voice coil, the voice coil vibrates under the action of magnetic field force so as to drive the vibrating diaphragm to vibrate to generate sound.
27. The utility model provides a moving coil loudspeaker, includes magnet, voice coil loudspeaker voice coil, centering branch piece and vibrating diaphragm, its characterized in that: carrying out n-order differential operation on an input audio signal before the input audio signal is transmitted to a voice coil of the moving-coil loudspeaker, wherein the n-order differential operation only comprises first-order, second-order, fourth-order or fifth-order differential operation; the voice coil is positioned in a magnetic field generated by the magnet, the voice coil, the vibrating diaphragm and the centering support are connected together, and the centering support maintains the voice coil to move only along the axial direction; when the input signal after the n-order differential operation passes through the voice coil, the voice coil vibrates under the action of magnetic field force so as to drive the vibrating diaphragm to vibrate to generate sound.
28. The utility model provides a moving coil loudspeaker, includes magnet, voice coil loudspeaker voice coil, centering branch piece and vibrating diaphragm, its characterized in that: a module with a function of carrying out n-order differential operation on an input audio signal is arranged in the moving-coil loudspeaker, and the n-order differential operation only comprises first-order, second-order, fourth-order or fifth-order differential operation; the differential operation function of the module can be realized by hardware or software; the voice coil is positioned in a magnetic field generated by the magnet, the voice coil, the vibrating diaphragm and the centering support are connected together, and the centering support maintains the voice coil to move only along the axial direction; when the input signal subjected to differential operation by the module passes through the voice coil, the voice coil vibrates under the action of the magnetic field force, so that the vibrating diaphragm is driven to vibrate to generate sound.
29. An apparatus for processing an audio signal, comprising an audio signal amplifier, a moving coil speaker, characterized in that: performing a third order differential operation on an input audio signal before the input audio signal is transmitted to a voice coil of the moving coil speaker; the audio signal amplifier amplifies the input signal, and the input signal subjected to the third-order differential operation enables the moving-coil loudspeaker to generate sound when passing through a voice coil of the moving-coil loudspeaker.
30. An apparatus for processing an audio signal, comprising an audio signal amplifier, a moving coil speaker, characterized in that: a module having a function of performing a third-order differential operation on an input audio signal is present in the apparatus; the third order differential operation function of the module can be realized by hardware or software, the audio signal amplifier amplifies the input signal, and the input signal subjected to the third order differential operation by the module passes through a voice coil of the moving-coil loudspeaker, so that the moving-coil loudspeaker generates sound.
31. The apparatus of claim 30, wherein: the module is located on a transmission path of the input signal, and the transmission path is a path through which the input signal is transmitted from a signal input end of the device to a voice coil of the moving-coil speaker.
32. The apparatus of claim 30, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the apparatus to a signal input terminal of the audio signal amplifier.
33. The apparatus of claim 30, wherein: the module is located on a transmission path of the input signal, and the transmission path is a path through which the input signal is transmitted from a signal output end of the audio signal amplifier to a voice coil of the moving-coil speaker.
34. The apparatus of claim 30, wherein: the module is located inside the audio signal amplifier.
35. An apparatus for processing an audio signal, comprising an audio signal amplifier, a moving coil speaker, characterized in that: carrying out n-order differential operation on an input audio signal before the input audio signal is transmitted to a voice coil of the moving-coil loudspeaker, wherein the n-order differential operation only comprises first-order, second-order, fourth-order or fifth-order differential operation; the audio signal amplifier amplifies the signal, and the input signal subjected to the n-order differential operation enables the moving-coil loudspeaker to generate sound when passing through a voice coil of the moving-coil loudspeaker.
36. An apparatus for processing an audio signal, comprising an audio signal amplifier, a moving coil speaker, characterized in that: a module having a function of performing n-order differential operation on an input signal is arranged in the device, and the n-order differential operation only comprises first-order, second-order, fourth-order or fifth-order differential operation; the differential operation function of the module can be realized by hardware or software, the audio signal amplifier amplifies the input signal, and the input signal subjected to differential operation by the module generates sound when passing through a voice coil of the moving-coil loudspeaker.
37. The apparatus of claim 36, wherein: the module is located on a transmission path of the input signal, and the transmission path is a path through which the input signal is transmitted from a signal input end of the device to a voice coil of the moving-coil speaker.
38. The apparatus of claim 36, wherein: the module is located on a transmission path of the input signal, the transmission path being a path through which the input signal is transmitted from a signal input terminal of the apparatus to a signal input terminal of the audio signal amplifier.
39. The apparatus of claim 36, wherein: the module is located on a transmission path of the input signal, and the transmission path is a path through which the input signal is transmitted from a signal output end of the audio signal amplifier to a voice coil of the moving-coil speaker.
40. The apparatus of claim 36, wherein: the module is located inside the audio signal amplifier.
41. An apparatus for processing an audio signal, comprising: the device comprises a digital-to-analog conversion module, a second-order differential operation module and an electrostatic loudspeaker; the digital-to-analog conversion module converts a received digital audio signal into a corresponding analog audio signal, the second-order differential operation module has a function of performing second-order differential operation on the analog audio signal, the second-order differential operation function of the second-order differential operation module can be realized by hardware or software, and the analog audio signal output by the digital-to-analog conversion module is subjected to second-order differential operation by the second-order differential operation module and then is added to the signal input end of the electrostatic loudspeaker, so that the electrostatic loudspeaker generates sound.
42. The apparatus of claim 41, wherein: the device also comprises a memory; the memory is used for storing digital audio signals.
43. The apparatus of claim 41, wherein: the device also comprises an audio signal amplifier; the final stage signal amplifier is used for amplifying the analog audio signal to increase the power of the analog audio signal, so that the volume of sound generated by the electrostatic loudspeaker is increased.
44. An apparatus for processing an audio signal, comprising: the device comprises a digital-to-analog conversion module, an n-order differential operation module and an electrostatic loudspeaker; the digital-to-analog conversion module can convert a received digital audio signal into a corresponding analog audio signal, the n-order differential operation module has a function of performing n-order differential operation on the analog audio signal, and the n-order differential operation only comprises first-order or third-order differential operation; the n-order differential operation function can be realized by hardware or software, and the analog audio signal subjected to differential operation by the n-order differential operation module is added to the signal input end of the electrostatic loudspeaker, so that the electrostatic loudspeaker generates sound.
45. The apparatus of claim 44, wherein: the device also comprises a memory; the memory is used for storing digital audio signals.
46. The apparatus of claim 44, wherein: the device also comprises an audio signal amplifier; the final stage signal amplifier is used for amplifying the analog audio signal to increase the power of the analog audio signal, so that the volume of sound generated by the electrostatic loudspeaker is increased.
47. An apparatus for processing an audio signal, comprising: the digital-to-analog conversion module, the third-order differential operation module and the moving-coil loudspeaker are arranged on the base; the digital-to-analog conversion module can convert a received digital audio signal into a corresponding analog audio signal, the third-order differential operation module has a function of performing third-order differential operation on the analog audio signal, and the third-order differential operation function of the third-order differential operation module can be realized by hardware or software; the analog audio signal subjected to the third-order differential operation by the third-order differential operation module is added to the signal input end of the moving-coil loudspeaker, so that the moving-coil loudspeaker generates sound.
48. The apparatus of claim 47, wherein: the device also comprises a memory; the memory is used for storing digital audio signals.
49. The apparatus of claim 47, wherein: the device also comprises an audio signal amplifier;
the final signal amplifier is used for amplifying the analog audio signal to increase the power of the analog audio signal, so that the sound volume generated by the moving-coil loudspeaker is increased.
50. An apparatus for processing an audio signal, comprising: the system comprises a digital-to-analog conversion module, an n-order differential operation module and a moving-coil loudspeaker; the digital-to-analog conversion module can convert the received digital audio signal into a corresponding analog audio signal, the n-order differential operation module has the function of performing n-order differential operation on the analog audio signal, and the n-order differential operation only comprises first-order, second-order, fourth-order or fifth-order differential operation; the differential operation function of the n-order differential operation module can be realized by hardware or software; the analog audio signal which is subjected to differential operation by the n-order differential operation module is added to the signal input end of the moving-coil loudspeaker, so that the moving-coil loudspeaker generates sound.
51. The apparatus of claim 50, wherein: the device also comprises a memory; the memory is used for storing digital audio signals.
52. The apparatus of claim 50, wherein: the device also comprises an audio signal amplifier; the final signal amplifier is used for amplifying the analog audio signal to increase the power of the analog audio signal, so that the sound volume generated by the moving-coil loudspeaker is increased.
53. A communications apparatus, comprising: the device comprises an acoustic-electric conversion module, a second-order differential operation module, an analog-digital conversion module, a carrier wave generator, a modulator and an antenna; the sound-electricity conversion module converts voice information generated by an audio information source into corresponding analog audio electrical signals, the second-order differential operation module has a function of performing second-order differential operation on the analog audio electrical signals, and the second-order differential operation function of the second-order differential operation module can be realized by hardware or software; the analog audio electrical signal subjected to second-order differential operation by the second-order differential operation module is added to a signal input end of the analog-to-digital conversion module, and the analog-to-digital conversion module can convert the received analog audio electrical signal into a corresponding digital audio signal; the digital audio signal is added at the baseband signal input end of the modulator, the modulator modulates the carrier wave generated by the carrier wave generator by using the received digital audio signal and transmits the carrier wave to the antenna, and the antenna converts the received modulated carrier wave into electromagnetic waves and sends the electromagnetic waves out.
54. The communications device of claim 53, wherein: the device also comprises a signal amplifier; the signal amplifier is used for amplifying the modulated wave output by the modulator and transmitting the amplified carrier wave to the antenna.
55. A communications apparatus, comprising: the device comprises an acoustic-electric conversion module, an n-order differential operation module, an analog-digital conversion module, a carrier wave generator, a modulator and an antenna; the sound-electricity conversion module can convert voice information generated by an audio information source into corresponding analog audio electrical signals, the n-order differential operation module has the function of performing n-order differential operation on the analog audio electrical signals, and the n-order differential operation only comprises first-order, third-order, fourth-order or fifth-order differential operation; the n-order differential operation function of the n-order differential operation module can be realized by hardware or software, the analog audio electric signal subjected to differential operation by the n-order differential operation module is added to the signal input end of the analog-to-digital conversion module, and the analog-to-digital conversion module can convert the received analog audio electric signal into a corresponding digital audio signal; the digital audio signal is added at the baseband signal input end of the modulator, the modulator modulates the carrier wave generated by the carrier wave generator by using the received digital audio signal and transmits the carrier wave to the antenna, and the antenna converts the received modulated carrier wave into electromagnetic waves and sends the electromagnetic waves out.
56. The communications device of claim 55, wherein: the device also comprises a signal amplifier; the signal amplifier is used for amplifying the modulated wave output by the modulator and transmitting the amplified carrier wave to the antenna.
57. A communications apparatus, comprising: the device comprises an antenna, a demodulator, a digital-to-analog conversion module, a second-order differential operation module and an electrostatic loudspeaker; the antenna is used for receiving modulated electromagnetic waves transmitted from space, the demodulator restores digital audio signals transmitted by a transmitting terminal from received modulated waves, the digital-to-analog conversion module converts the digital audio signals restored by the demodulator into corresponding analog audio signals, the second-order differential operation module has a function of performing second-order differential operation on the analog audio signals, and the second-order differential operation function of the second-order differential operation module can be realized by hardware or software; the analog audio signal subjected to the second order differential operation by the second order differential operation module is added to the signal input end of the electrostatic loudspeaker, so that the electrostatic loudspeaker generates sound.
58. The communications device of claim 57, wherein: the device also comprises a primary signal amplifier; the primary signal amplifier is used for amplifying the electric signal received by the antenna.
59. The communications device of claim 57, wherein: the device also comprises a final-stage signal amplifier; the final-stage signal amplifier is used for amplifying the analog audio signal output by the digital-to-analog conversion module so as to increase the power of the analog audio signal, and therefore the sound volume generated by the electrostatic loudspeaker is increased.
60. A communications apparatus, comprising: the device comprises an antenna, a demodulator, a digital-to-analog conversion module, an n-order differential operation module and an electrostatic loudspeaker; the antenna is used for receiving modulated electromagnetic waves transmitted from space, the demodulator restores digital audio signals sent by a transmitting terminal from received modulated waves, the digital-to-analog conversion module converts the digital audio signals restored by the demodulator into corresponding analog audio signals, the n-order differential operation module has the function of performing n-order differential operation on the analog audio signals, the n-order differential operation only comprises first-order or third-order differential operation, and the n-order differential operation function of the n-order differential operation module can be realized by hardware or software; the analog audio signal differentiated by the n-order differential operation module is added to a signal input end of the electrostatic loudspeaker, so that the electrostatic loudspeaker produces sound.
61. The communications device of claim 60, wherein: the device also comprises a primary signal amplifier; the primary signal amplifier is used for amplifying the electric signal received by the antenna.
62. The communications device of claim 60, wherein: the device also comprises a final-stage signal amplifier; the final stage signal amplifier is used for amplifying the analog audio signal to increase the power of the analog audio signal, so that the volume of sound generated by the electrostatic loudspeaker is increased.
63. A communications apparatus, comprising: the device comprises an antenna, a demodulator, a digital-to-analog conversion module, a third-order differential operation module and a moving-coil loudspeaker; the antenna is used for receiving modulated electromagnetic waves transmitted from space, the demodulator can restore digital audio signals sent by a sending end from received modulated waves, the digital-to-analog conversion module converts the digital audio signals restored by the demodulator into corresponding analog audio signals, the third-order differential operation module has the function of carrying out third-order differential operation on the analog audio signals, and the third-order differential operation function of the third-order differential operation module can be realized by hardware or software; the analog audio signal subjected to the third-order differential operation by the third-order differential operation module is added to the signal input end of the moving-coil loudspeaker, so that the moving-coil loudspeaker generates sound.
64. The communications device of claim 63, wherein: the device also comprises a primary signal amplifier; the primary signal amplifier is used for amplifying the electric signal received by the antenna.
65. The communications device of claim 63, wherein: the device also comprises a final-stage signal amplifier; the final signal amplifier is used for amplifying the analog audio signal to increase the power of the analog audio signal, so that the sound volume generated by the moving-coil loudspeaker is increased.
66. A communications apparatus, comprising: the system comprises an antenna, a demodulator, a digital-to-analog conversion module, an n-order differential operation module and a moving-coil loudspeaker; the antenna is used for receiving modulated electromagnetic waves transmitted from the space, the demodulator restores digital audio signals transmitted by a transmitting terminal from the received modulated waves, and the digital-to-analog conversion module converts the digital audio signals restored by the demodulator into corresponding analog audio signals; the n-order differential operation module has a function of performing n-order differential operation on the analog audio signal, the n-order differential operation only comprises first-order, second-order, fourth-order or fifth-order differential operation, and the differential operation function of the n-order differential operation module can be realized by hardware or software; the analog audio signal which is subjected to differential operation by the n-order differential operation module is added to the signal input end of the moving-coil loudspeaker, so that the moving-coil loudspeaker generates sound.
67. The communications device of claim 66, wherein: the device also comprises a primary signal amplifier; the primary signal amplifier is used for amplifying the electric signal received by the antenna.
68. The communications device of claim 66, wherein: the device also comprises a final-stage signal amplifier; the final signal amplifier is used for amplifying the analog audio signal to increase the power of the analog audio signal, so that the sound volume generated by the moving-coil loudspeaker is increased.
CN201910485069.0A 2018-06-05 2019-06-04 Electrostatic loudspeaker, moving-coil loudspeaker and device for processing audio signal Pending CN110913317A (en)

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