CN106792400A - Loudspeaker and the method for reducing loudspeaker total harmonic distortion - Google Patents
Loudspeaker and the method for reducing loudspeaker total harmonic distortion Download PDFInfo
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- CN106792400A CN106792400A CN201710155518.6A CN201710155518A CN106792400A CN 106792400 A CN106792400 A CN 106792400A CN 201710155518 A CN201710155518 A CN 201710155518A CN 106792400 A CN106792400 A CN 106792400A
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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
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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
- H04R9/02—Details
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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
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
This application provides a kind of loudspeaker and the method for reducing loudspeaker total harmonic distortion, the loudspeaker includes vibrating diaphragm, magnetic bowl, magnet, top flat, the first voice coil loudspeaker voice coil；Second voice coil loudspeaker voice coil, is arranged in the magnetic gap of the magnetic circuit assembly of top flat, magnet and magnetic bowl composition jointly with the first voice coil loudspeaker voice coil；Transient voltage suppressor diode, audio signal input end as loudspeaker in parallel with the first voice coil loudspeaker voice coil jointly after being connected with the second voice coil loudspeaker voice coil, when transient voltage suppressor diode is breakdown, the nonlinear change of the driving voice coil drive force of force compensating first of the second voice coil loudspeaker voice coil.The nonlinear change of driving force can be suppressed under voice coil loudspeaker voice coil large amplitude, and then reduce the total harmonic distortion that amplitude causes.
Description
Technical field
The application is related to loudspeaker field, more particularly to a kind of loudspeaker and the method for reducing loudspeaker total harmonic distortion.
Background technology
Loudspeaker is a kind of electricity-power-sonic transducer, and it is the critical elements in stereo set.Loudspeaker in people usually
Daily life in used extensively, bring many facilities.In automobile, broadcast, TV, audio amplifier, mobile phone, MP4, computer etc.
In electronics field, the application of loudspeaker is almost seen everywhere.
Loudspeaker is divided into many types according to principle difference, and such as coil-moving speaker, electromagnetic loudspeaker, piezoelectric type is raised one's voice
Device etc., coil-moving speaker is a kind of most common of which.Wherein, miniature moving-coil type loudspeaker basic structure is as shown in figure 1, bag
Include protecgulum 1, vibrating diaphragm 2, support 3, magnetic bowl 4, magnet 5, top flat 6 and voice coil loudspeaker voice coil 7.Voice coil loudspeaker voice coil 7 is placed in the magnetic field of magnetic circuit, works as audio
When voltage signal passes through voice coil loudspeaker voice coil 7, stress and there is corresponding vibration in the magnetostatic field that magnet 5 is produced in voice coil loudspeaker voice coil 7, and the drive of voice coil loudspeaker voice coil 7 is shaken
Film 2 together vibrates, and the air of surrounding corresponding vibration is occurred, converts mechanical energy into acoustic energy.When input voltage is improved, voice coil loudspeaker voice coil
7 Oscillation Amplitudes are accordingly improved.Voice coil loudspeaker voice coil 7 leaves the homogeneity range in magnetic gap magnetic field because of vibration, thus electromechanical conversion coefficient BL (B is voice coil loudspeaker voice coil
Internal average magnetic flux density, L is voice coil loudspeaker voice coil wire rod total length) can not keep constant, dynamo-electric effect F=IBL (F is driving force,
I is electric current) linear relationship destroyed, so as to cause non-linear distortion.
Improve the distortion caused by voice coil loudspeaker voice coil amplitude is excessive, typically using two methods：One is that two are using minor circle
Using long voice coil.Purpose is to reduce BL value changes of the voice coil loudspeaker voice coil under large amplitude state by both modes, final to reduce total humorous
Wave distortion (Total Harmonic Distortion, THD).But this two ways is defective：Using a side for minor circle
Formula needs and paper skeleton coordinates, and is realized for Microspeaker, receiver etc. difficult；And can be dropped by the way of a long voice coil
Muting sensitivity.
The content of the invention
In view of this, a kind of one side of the embodiment of the present application, there is provided loudspeaker, including vibrating diaphragm, magnetic bowl, magnet and
Top flat, also includes：First voice coil loudspeaker voice coil；Second voice coil loudspeaker voice coil, with the magnetic circuit group that the first voice coil loudspeaker voice coil is arranged at top flat, magnet and magnetic bowl composition jointly
In the magnetic gap of dress body；Transient voltage suppressor diode, it is jointly in parallel with the first voice coil loudspeaker voice coil as described after being connected with the second voice coil loudspeaker voice coil
The audio signal input end of loudspeaker, when the transient voltage suppressor diode is breakdown, the driving force of second voice coil loudspeaker voice coil is mended
Repay the nonlinear change of first voice coil drive force.
Preferably, the circuit between transient voltage suppressor diode and the first voice coil loudspeaker voice coil and the second voice coil loudspeaker voice coil connects through multiple back ofs the body
Portion's electrode is realized；Wherein, two leads of the first voice coil loudspeaker voice coil are connected with the first positive pole, the first negative pole respectively, two of the second voice coil loudspeaker voice coil
Lead is connected with the second positive pole, the second negative pole respectively, and transient voltage suppressor diode is passed through between the second positive pole and the 3rd positive pole
Connection；First positive pole and the first negative pole and the 3rd positive pole and the second negative pole, collectively as the audio signal input end of loudspeaker.
The quantity of the second voice coil loudspeaker voice coil is multiple, is series connection between multiple second voice coil loudspeaker voice coils or and connects relation.
The quantity of the second voice coil loudspeaker voice coil is two, and second sound is respectively provided with two opposite direction of displacement of the first voice coil loudspeaker voice coil
Circle.
Loudspeaker also include drive circuit, drive circuit further include signal output module, variable gain amplifier and
Power amplifier；Audio signal is exported to the sound of loudspeaker through signal output module, variable gain amplifier and power amplifier
Frequency signal input part.
The another aspect of the embodiment of the present application, there is provided a kind of method of reduction loudspeaker total harmonic distortion, methods described
Including：First voice coil loudspeaker voice coil and the second voice coil loudspeaker voice coil are arranged in the magnetic gap of the magnetic circuit assembly of top flat, magnet and magnetic bowl composition jointly；If
Put transient voltage suppress diode connect with second voice coil loudspeaker voice coil, then jointly it is in parallel with first voice coil loudspeaker voice coil conduct described in raise one's voice
The audio signal input end of device；When the transient voltage suppressor diode is breakdown, the driving force compensating institute of second voice coil loudspeaker voice coil
State the nonlinear change of the first voice coil drive force.
When the transient voltage suppressor diode is breakdown, the first voice coil loudspeaker voice coil described in the driving force compensating of second voice coil loudspeaker voice coil drives
The nonlinear change of power includes：When audio signal input voltage is less than the breakdown voltage of the transient voltage suppressor diode,
The transient voltage suppressor diode and the second voice coil loudspeaker voice coil are off state, and the first voice coil loudspeaker voice coil is produced and drives the first of the diaphragm oscillations
Driving force；When audio signal input voltage is more than or equal to the breakdown voltage of the transient voltage suppressor diode, described first
Driving force produces nonlinear change, and the transient voltage suppressor diode and the second voice coil loudspeaker voice coil are open-circuit condition, second voice coil loudspeaker voice coil
The second driving force is produced to compensate the nonlinear change of the First Driving Force.
The quantity of second voice coil loudspeaker voice coil is multiple, is series connection between multiple second voice coil loudspeaker voice coils or and connects relation.
Preferably, the quantity of second voice coil loudspeaker voice coil is two, is separately positioned on first voice coil loudspeaker voice coil, two opposite displacements
On direction.
When the transient voltage suppressor diode is breakdown, the first voice coil loudspeaker voice coil described in the driving force compensating of second voice coil loudspeaker voice coil drives
The nonlinear change of power includes：When audio signal input voltage is less than the breakdown voltage of the transient voltage suppressor diode,
The transient voltage suppressor diode and the second voice coil loudspeaker voice coil are off state, and the first voice coil loudspeaker voice coil is on positive displacement direction and negative displacement direction
First Driving Force is alternately produced respectively；Audio signal input voltage punctures more than or equal to the transient voltage suppressor diode
During voltage, the First Driving Force on positive displacement direction and negative displacement direction produces nonlinear change, and the transient voltage suppresses
Diode and two the second voice coil loudspeaker voice coils are open-circuit condition, and First Driving Force on the positive displacement direction and negative displacement direction is compensated jointly
Nonlinear change.
The beneficial effect of the embodiment of the present application includes：The loudspeaker that the embodiment of the present application is provided can be carried by additional voice coil loudspeaker voice coil
The total driving force of additional drives dynamic balance of confession, can suppress the nonlinear change of driving force, and then reduce under voice coil loudspeaker voice coil large amplitude
The THD that amplitude causes.The embodiment of the present application has simple structure, and easy to implement, good stability can be entered by additional driving force
Mobile state is adjusted, finally the advantages of reduction THD.
Brief description of the drawings
By description referring to the drawings to the embodiment of the present application, above-mentioned and other purposes of the application, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is the generalized section of loadspeaker structure in the prior art；
Fig. 2 is the generalized section of the loadspeaker structure that the embodiment of the present application is provided；
Fig. 3 is the schematic equivalent circuit of the loadspeaker structure that the embodiment of the present application is provided；
Fig. 4 is the back electrode schematic diagram of the loudspeaker that the embodiment of the present application is provided；
Fig. 5 is the generalized section of the loadspeaker structure that the embodiment of the present application is provided；
Fig. 6 is that the electric current of the embodiment of the present application sound intermediate frequency input signal changes over time curve synoptic diagram；
Fig. 7 is that the electric current after the embodiment of the present application sound intermediate frequency input signal is modulated through TVS diode changes over time curve
Schematic diagram；
Fig. 8 is flux density distribution FEM Numerical Simulation schematic diagram in the embodiment of the present application magnetic gap；
Fig. 9 be in the embodiment of the present application voice coil loudspeaker voice coil inside average magnetic flux density with change in displacement simulation result schematic diagram；
Figure 10 is the curve synoptic diagram that the First Driving Force that the first voice coil loudspeaker voice coil is provided in the embodiment of the present application is changed over time；
Figure 11 is the curve synoptic diagram that the second driving force that the second voice coil loudspeaker voice coil is provided in the embodiment of the present application is changed over time；
Figure 12 is after the second driving force is compensated to the nonlinear change that First Driving Force occurs in the embodiment of the present application
Total activation force profile schematic diagram；
Figure 13 is that the circuit theory of the audio signal input that drive circuit is provided for loudspeaker in the embodiment of the present application is illustrated
Figure.
Specific embodiment
The application is described below based on embodiment, but the application is not restricted to these embodiments.Under
It is detailed to describe some specific detail sections during text is to the detailed description of the application.Do not have for a person skilled in the art
The description of these detail sections can also completely understand the application.In order to avoid obscuring the essence of the application, known method, mistake
Journey, flow, element and circuit do not have narration in detail.
Additionally, it should be understood by one skilled in the art that accompanying drawing is provided to descriptive purpose provided herein, and
What accompanying drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to by electric by least one element or sub-circuit
The galvanic circle that connection or electromagnetism are connected and composed." connected when element or circuit " being connected to " another element or element/circuit is claimed
" between two nodes when, it can directly be coupled or be connected to another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.Conversely, " connecting when title element " being directly coupled to " or directly
Be connected to " another element when, it is meant that both do not exist intermediary element.
Unless the context clearly requires otherwise, otherwise entire disclosure and " including " in claims, similar etc. "comprising"
Word should be construed to the implication for including rather than exclusive or exhaustive implication；That is, be " including but not limited to " contains
Justice.
In the description of the present application, it is to be understood that term " first ", " second " etc. are only used for describing purpose, without
It is understood that to indicate or implying relative importance.Additionally, in the description of the present application, unless otherwise indicated, the implication of " multiple "
It is two or more.
The loudspeaker that the embodiment of the present application is provided, addition of the second voice coil loudspeaker voice coil and provides additional driving force, by additional driving force
Total driving force is balanced, the non-thread of the total driving force of voice coil loudspeaker voice coil can be suppressed when audio input signal increase and voice coil loudspeaker voice coil produce large magnitude
Property change, and then reduce the THD that causes because amplitude increases.
Fig. 2 is the generalized section of the loadspeaker structure that the embodiment of the present application is provided.Loudspeaker include protecgulum 1, vibrating diaphragm 2,
Support 3, magnetic bowl 4, magnet 5, top flat 6, the first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 8.Top flat 6 and magnetic bowl 4 are permeability magnetic material, viscous with magnet 5
Composition magnetic circuit assembly is connect, magnetic gap is formed between top flat 6, magnetic bowl 4 and magnet 5, there is magnetostatic field, the He of the first voice coil loudspeaker voice coil 7 in magnetic gap
Second voice coil loudspeaker voice coil 8 is co-located in magnetic gap.The implementation of the first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 8 can be bonded, connected by skeleton
Or in coiling voice coil loudspeaker voice coil by coil winding machine programme-control integral multitone ring of direct coiling etc..Distribution of Magnetic Field in magnetic gap is not
Uniformly, magnetic density value is greatest around in top flat 6, is accordingly reduced apart from the position relatively far away from of top flat 6.
Loudspeaker also includes transient voltage suppressor diode (Fig. 2 is not shown), and transient voltage suppressor diode passes through circuit
The first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 8 are connected, the equivalent circuit after connection is as shown in figure 3, transient voltage suppressor diode 10 and second
Voice coil loudspeaker voice coil 8 is connected, its branch road and the place branch circuit parallel connection of the first voice coil loudspeaker voice coil 7 for being formed of being connected with the second voice coil loudspeaker voice coil 8, collectively as loudspeaker
Audio signal input end.
When there is audio signal to be input into, loudspeaker is started working, the first voice coil loudspeaker voice coil 7 and the up-down vibration of the second voice coil loudspeaker voice coil 8.When first
The position of the voice coil loudspeaker voice coil 8 of voice coil loudspeaker voice coil 7 and second is vibrated to when near top flat 6, and the overall average magnetic flux density of voice coil loudspeaker voice coil is maximum；When the first sound
The voice coil loudspeaker voice coil 8 of circle 7 and second is because when vibration is relatively distant from top flat 6, the overall average magnetic flux density of voice coil loudspeaker voice coil reduces.
(wherein F is driving force to driving force formula F=I × B × L according to voice coil loudspeaker voice coil, and I is the current strength of flowing through voice coil, B
It is voice coil loudspeaker voice coil inside average magnetic flux density, L is voice coil loudspeaker voice coil wire rod total length), it is assumed that the first voice coil loudspeaker voice coil subscript1Represent, the second sound
Circle subscript2Represent, then the First Driving Force that the first voice coil loudspeaker voice coil is produced is F1=I1×B1×L1；The second drive that second voice coil loudspeaker voice coil is produced
Power is F2=I2×B2×L2。
When breakdown voltage of the audio signal input voltage less than transient voltage suppressor diode 10, nothing in the second voice coil loudspeaker voice coil 8
Electric current is flowed into, and the second voice coil loudspeaker voice coil 8 does not work, and now the first voice coil loudspeaker voice coil 7 is smaller with the vibration displacement of the second voice coil loudspeaker voice coil 8, and the inside of the first voice coil loudspeaker voice coil 7 is flat
Equal magnetic density B1Value is larger, but is 0 due to flowing into the electric current of the second voice coil loudspeaker voice coil 8, so total driving force F is equal to the first voice coil loudspeaker voice coil 7
First Driving Force, i.e. F=F1=I1×B1×L1.With the increase of audio signal input voltage, I1Constantly increase, the first sound therewith
The B when displaced position of circle is also near top flat 61Substantially remain unchanged, then now First Driving Force F1With I1Between change it is bent
Line relation can be considered linear relationship.
When audio signal input voltage be increased above or equal to transient voltage suppressor diode 10 breakdown voltage when,
One voice coil loudspeaker voice coil 7 and the vibration displacement of the second voice coil loudspeaker voice coil 8 are larger, and the first voice coil loudspeaker voice coil 7 farther away from top flat 6 due to causing internal average magnetic flux
Density B1Reduce, because now transient voltage suppressor diode 10 is breakdown, there is electric current to flow into the second voice coil loudspeaker voice coil 8, so total drive
The First Driving Force F that power F is produced by the first voice coil loudspeaker voice coil 71The the second driving force F produced with the second voice coil loudspeaker voice coil 82Composition, total driving force F=
F1+F2=I1×B1×L1+I2×B2×L2.By the regulation of transient voltage suppressor diode 10, when the vibration displacement of the first voice coil loudspeaker voice coil 7
Smaller and internal average magnetic flux density B1When larger, the second voice coil loudspeaker voice coil 8 does not work, and now total driving force F is only First Driving Force
F1；When the vibration displacement of the first voice coil loudspeaker voice coil 7 is larger and internal average magnetic flux density B1Become hour, the second voice coil loudspeaker voice coil 8 provides the second driving force
F2, total driving force becomes and turns to F=F1+F2.When being more than breakdown voltage due to audio signal input voltage, the amplitude of the first voice coil loudspeaker voice coil 7 increases
, the B of first voice coil loudspeaker voice coil 7 farther with the relative position of top flat 6 greatly1Can diminish；Due to B1And I1Numerical value all there occurs change, that
First Driving Force F1Change be a kind of nonlinear change, and due to B1Numerical value diminish now First Driving Force F1
Incrementss during than original linear change are few.But now the second voice coil loudspeaker voice coil 8 can provide the second driving force of equidirectional, therefore
Can compensate for First Driving Force F1The part reduced due to nonlinear change so that total driving force F maintain it is original linear
Level during change, the total driving force of dynamic balance is driven by second, voice coil loudspeaker voice coil can be suppressed when voice coil loudspeaker voice coil produces large magnitude and is driven
The nonlinear change of power, and then reduce the THD that large magnitude causes.
First Driving Force F1Variable quantity when there is nonlinear change is relatively small, therefore it is required that the second voice coil loudspeaker voice coil 8 is produced
The second driving force F2Also it is corresponding smaller, First Driving Force F can be made up1Nonlinear change, if the second driving force F2
It is excessive, can further cause THD.Therefore, from the point of view of driving force formula, the wire rod total length of the second voice coil loudspeaker voice coil 8 should be less than the first sound
Circle 7, present inventor has found that the wire rod total length of the second voice coil loudspeaker voice coil 8 can reach 1/4 left side of the wire rod total length of the first voice coil loudspeaker voice coil 7
It is right.Preferably, the D.C. resistance scope of the first voice coil loudspeaker voice coil 7 is the Ω of 4 Ω to 40, and wire range is 0.025mm to 0.12mm.The
The D.C. resistance scope of two voice coil loudspeaker voice coils 8 is the Ω of 1 Ω to 10, and wire range is 0.025mm to 0.12mm.
Transient voltage suppressor diode 10 is bilateral transient voltage suppression diode, breakdown voltage scope be 1Vrms extremely
10Vrms, the preferred model SLCA5.0 of type selecting.In one embodiment, the voice coil loudspeaker voice coil 7 of transient voltage suppressor diode 10 and first
And the second circuit connection between voice coil loudspeaker voice coil 8 can be realized by multiple back electrodes, as shown in figure 4, two leads of the first voice coil loudspeaker voice coil 7
Be connected with the first positive pole 91, the first negative pole 92 respectively, two leads of the second voice coil loudspeaker voice coil 8 respectively with the second positive pole 93, the second negative pole
94 connections, are connected between the second positive pole 93 and the 3rd positive pole 95 by transient voltage suppressor diode 10；First positive pole 91 and
One negative pole 92 and the 3rd positive pole 95 and the second negative pole 94, collectively as the audio signal input end of loudspeaker.Work as audio signal
Input voltage is increased to when can puncture transient voltage suppressor diode 10, is turned between the 3rd positive pole 95 and the second positive pole 93,
Electric current flows into the second voice coil loudspeaker voice coil 8 and produces the second driving force.The setting form of above-mentioned each back electrode is not limited, including but is not limited to
In pad, pcb board, flexible PCB, wire or shell fragment, for ease of installing, wire carries binding post.
The quantity of the second voice coil loudspeaker voice coil 8 can be one or more, when the quantity of the second voice coil loudspeaker voice coil 8 is multiple, multiple second
The second driving force that voice coil loudspeaker voice coil 8 is produced compensates the nonlinear change of First Driving Force jointly.Multiple second voice coil loudspeaker voice coils 8 can be arranged on
On the same direction of displacement of the first voice coil loudspeaker voice coil 7 (positive displacement direction or negative displacement direction), or distribution is arranged on the first voice coil loudspeaker voice coil 7
On two opposite direction of displacement (positive displacement direction and negative displacement direction).It is arranged on same direction of displacement all second
The wire rod total length sum of voice coil loudspeaker voice coil 8 can reach 1/4 or so of the wire rod total length of the first voice coil loudspeaker voice coil 7.By back electricity
Can be series relationship or parallel relationship between multiple second voice coil loudspeaker voice coils 8 when pole realizes that its circuit is connected；Using series relationship
When, multiple second voice coil loudspeaker voice coils 8 are drawn two leads and are connected with the second positive pole 93 in Fig. 4, the second negative pole 94 respectively after connecting；Adopt
When using parallel relationship, multiple second voice coil loudspeaker voice coils 8 are drawn two leads and are connected with the second positive pole 93 in Fig. 4, the second negative pole 94 respectively.
In one embodiment, the quantity of the second voice coil loudspeaker voice coil of the loudspeaker is two, and is separately positioned on the first voice coil loudspeaker voice coil
On two opposite direction of displacement, as shown in Figure 5.The loudspeaker includes protecgulum 1, vibrating diaphragm 2, support 3, magnetic bowl 4, magnet 5, top flat
6 and first voice coil loudspeaker voice coil 7, second voice coil loudspeaker voice coil 81 is set up in the positive displacement side of the first voice coil loudspeaker voice coil 7, set on opposite negative displacement direction
Second voice coil loudspeaker voice coil 82 is put, both are parallel relationship, the second positive pole 93, the second negative pole in two leads and Fig. 5 are drawn respectively
94 connections.In the present embodiment, the D.C. resistance of the first voice coil loudspeaker voice coil 7 is 7.2 Ω, and voice coil loudspeaker voice coil wire rod total length is 1.2m；Two the second sounds
The D.C. resistance of circle 81,82 is 0.5 Ω, and voice coil loudspeaker voice coil wire rod total length is 0.3m.Two lead-out wires of the first voice coil loudspeaker voice coil 7 respectively with
First positive pole 91, the first negative pole 92 are connected；Pass through transient voltage suppressor diode 10 between second positive pole 93 and the 3rd positive pole 95
Connection；First positive pole 91 and the first negative pole 92 and the 3rd positive pole 95 and the second negative pole 94, collectively as the audio letter of loudspeaker
Number input.
Sine wave of the present embodiment using frequency as 100Hz as illustrating as a example by input signal, input to the first positive pole
91 and first the current signal of negative pole 92 and the 3rd positive pole 95 and the second negative pole 94 change over time curve as shown in fig. 6, appointing
What meets this principle less than the input signal of harmonic frequency of loudspeakers.Current signal is straight through the first positive pole 91, the first negative pole 92
Connect the first voice coil loudspeaker voice coil 7 of inflow.Because there is transient voltage suppressor diode 10 between the second positive pole 93 and the 3rd positive pole 95, so this is electric
Stream signal flows into the second voice coil loudspeaker voice coil after transient voltage suppressor diode 10 is modulated, then by the second positive pole 93, the second negative pole 94
81st, 82, it is as shown in Figure 7 that the current signal changes over time curve.
In the magnetic gap that first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 81,82 are located at, Distribution of Magnetic Field is simultaneously uneven, magnetic density point
As shown in figure 8, magnetic density value is greatest around in top flat 6, the position away from top flat 6 accordingly drops cloth FEM Numerical Simulation
It is low.During speaker operation, the first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 81,82 up-down vibrations.When 7 and second voice coil loudspeaker voice coil of basic voice coil loudspeaker voice coil 81,82
Put and be vibrated to when near top flat 6, the average magnetic flux density of voice coil loudspeaker voice coil is maximum；When the first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 81,82 are because shake
Move during away from top flat 6, voice coil loudspeaker voice coil average magnetic flux density reduces.But due to the first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 81,82 and top flat 6
Relative position is different, and the change curve of voice coil loudspeaker voice coil displacement and magnetic density is also differed, and its internal average magnetic flux density is with position
Put variation diagram simulation result as shown in Figure 9.C1 curves represent the magnetic density of the first voice coil loudspeaker voice coil 7 with displacement changing curve, C2 in Fig. 9
Curve represents the magnetic density of the second voice coil loudspeaker voice coil 81 with displacement changing curve, and C3 curves represent the additional magnetic density of second voice coil loudspeaker voice coil 82
With displacement changing curve.
Because loudspeaker is being believed that basic phase less than phase between the following vibration phase of resonant frequency point and input signal
Together, when input current signal is 0A, the first voice coil loudspeaker voice coil 7 and the second voice coil loudspeaker voice coil 81,82 displacements are 0mm；When input current signal is positive
When maximum, three voice coil loudspeaker voice coil positive-displacements reach maximum, and maximum forward displacement is 0.4mm in the present embodiment；Work as input current signal
When negative sense is maximum, three voice coil loudspeaker voice coil negative sense displacements reach maximum, and the displacement of maximum negative sense is -0.4mm in the present embodiment.
According to driving force formula F=I × B × L, it is known that the electric current of the first voice coil loudspeaker voice coil 7 of input and the second voice coil loudspeaker voice coil 81,82 is with the time
Magnetic density value (B), voice coil loudspeaker voice coil wire rod total length (L) of the curve (I), voice coil loudspeaker voice coil of change in different vibration positions, and simultaneously
Know that speakers low frequencies vibration phase is basically identical with input current signal phase, just can determine that the song that driving force F is changed over time
Line.Wherein, the First Driving Force F that the first voice coil loudspeaker voice coil 7 is provided1The curve for changing over time is as shown in Figure 10；Second voice coil loudspeaker voice coil 81 is provided
The second driving force F21The the second driving force F provided with the second voice coil loudspeaker voice coil 8222The curve for changing over time is as shown in figure 11, Figure 11
Middle F21Represented by C4, F22Represented by C5.
The First Driving Force F provided by the first voice coil loudspeaker voice coil 7 in Figure 101Near 2.5ms, 7.5ms, 12.5ms, 17.5ms
There is nonlinear change in Shi Yinwei magnetic density B value reductions, and distortion occur in crest, trough.The second voice coil loudspeaker voice coil 81,82 is carried in Figure 11
The the second driving force F for supplying21、F22Amplitude reaches greatly when near 2.5ms, 7.5ms, 12.5ms, 17.5ms, and second drives
Power F21、F22To First Driving Force F1The nonlinear change of appearance is compensated, such as at 2.5ms, F21And F22In negative displacement
Simultaneously to F on direction1There is compensating action.Total driving force F=F after compensation1+F21+F22As shown in figure 12.
By comparing Figure 12 and Figure 10, it is compensated after the curve shape that changes over time of driving force close to sinusoidal
Ripple, i.e. First Driving Force nonlinear change degree are reduced.Total driving force of force compensating is driven closer to sine wave by second,
The purpose of loudspeaker THD is reduced so as to reach.
In one embodiment, the loudspeaker can also further include the drive circuit for providing audio signal input.
As shown in figure 13, including signal output module 11, variable gain amplifier 12, power amplifier 13.Variable gain amplifier 12
Adjustment dynamic range of signals, stabilization signal power, then being amplified to linearly by power amplifier 13 can produce loudspeaker
Driving force is given birth to cause the degree of diaphragm oscillations.Signal is through signal output module 11, variable gain amplifier 12 and power amplification
Device 13 is input into the first positive pole shown in the audio signal input end of loudspeaker as described above, i.e. power amplifier 13 and Fig. 4
91st, the first negative pole 92 is connected, and is input a signal into the branch road where the first voice coil loudspeaker voice coil 7, at the same with the 3rd positive pole 95, the second negative pole 94
Connection, inputs a signal into the branch road to where the series connection of the second voice coil loudspeaker voice coil 81,82 transient voltage suppressor diode 10.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for those skilled in the art
For, the application can have various changes and change.It is all any modifications made within spirit herein and principle, equivalent
Replace, improve etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of loudspeaker, including vibrating diaphragm, magnetic bowl, magnet and top flat, it is characterised in that also include：
First voice coil loudspeaker voice coil；
Second voice coil loudspeaker voice coil, the magnetic with the magnetic circuit assembly that first voice coil loudspeaker voice coil is arranged at the top flat, magnet and magnetic bowl composition jointly
In gap；
Transient voltage suppressor diode, it is jointly in parallel with first voice coil loudspeaker voice coil after being connected with second voice coil loudspeaker voice coil to be raised described in
The audio signal input end of sound device, when the transient voltage suppressor diode is breakdown, the driving force compensating of second voice coil loudspeaker voice coil
The nonlinear change of first voice coil drive force.
2. loudspeaker according to claim 1, it is characterised in that the transient voltage suppressor diode and first sound
Circuit between circle and the second voice coil loudspeaker voice coil connects through multiple back electrodes and realizes；Wherein, two leads of the first voice coil loudspeaker voice coil respectively with
First positive pole, the connection of the first negative pole, two leads of the second voice coil loudspeaker voice coil are connected with the second positive pole, the second negative pole respectively, the second positive pole
It is connected by transient voltage suppressor diode between the 3rd positive pole；First positive pole and the first negative pole and the 3rd positive pole with
Second negative pole, collectively as the audio signal input end of the loudspeaker.
3. loudspeaker according to claim 1, it is characterised in that the quantity of second voice coil loudspeaker voice coil is multiple, multiple second
It is series connection between voice coil loudspeaker voice coil or and connects relation.
4. loudspeaker according to claim 3, it is characterised in that the quantity of second voice coil loudspeaker voice coil is two, described the
Second voice coil loudspeaker voice coil is respectively provided with the one opposite direction of displacement of voice coil loudspeaker voice coil two.
5. loudspeaker according to claim 1 and 2, it is characterised in that loudspeaker also includes drive circuit, the driving electricity
Road further includes signal output module, variable gain amplifier and power amplifier；Audio signal through signal output module, can
Variable-gain amplifier and power amplifier are exported to the audio signal input end of the loudspeaker.
6. it is a kind of reduce loudspeaker total harmonic distortion method, it is characterised in that methods described includes：
First voice coil loudspeaker voice coil and the second voice coil loudspeaker voice coil are arranged in the magnetic gap of the magnetic circuit assembly of top flat, magnet and magnetic bowl composition jointly；
Transient voltage suppression diode is set to be connected with second voice coil loudspeaker voice coil, then it is jointly in parallel with first voice coil loudspeaker voice coil as institute
State the audio signal input end of loudspeaker；
When the transient voltage suppressor diode is breakdown, the first voice coil drive force described in the driving force compensating of second voice coil loudspeaker voice coil
Nonlinear change.
7. method according to claim 6, it is characterised in that described when the transient voltage suppressor diode is breakdown
The nonlinear change of the first voice coil drive force includes described in the driving force compensating of the second voice coil loudspeaker voice coil：
When audio signal input voltage is less than the breakdown voltage of the transient voltage suppressor diode, the transient voltage suppresses two
Pole pipe and the second voice coil loudspeaker voice coil are off state, and the first voice coil loudspeaker voice coil produces the First Driving Force for driving the diaphragm oscillations；
When audio signal input voltage is more than or equal to the breakdown voltage of the transient voltage suppressor diode, described first drives
Power produces nonlinear change, and the transient voltage suppressor diode and the second voice coil loudspeaker voice coil are open-circuit condition, and second voice coil loudspeaker voice coil is produced
Second driving force compensates the nonlinear change of the First Driving Force.
8. method according to claim 6, it is characterised in that the quantity of second voice coil loudspeaker voice coil is multiple, multiple second sounds
It is series connection between circle or and connects relation.
9. method according to claim 7, it is characterised in that the quantity of second voice coil loudspeaker voice coil is two, is separately positioned on
On first voice coil loudspeaker voice coil, two opposite direction of displacement.
10. method according to claim 9, it is characterised in that described when the transient voltage suppressor diode is breakdown
The nonlinear change of the first voice coil drive force includes described in the driving force compensating of the second voice coil loudspeaker voice coil：
When audio signal input voltage is less than the breakdown voltage of the transient voltage suppressor diode, the transient voltage suppresses two
Pole pipe and the second voice coil loudspeaker voice coil are off state, and the first voice coil loudspeaker voice coil is alternately produced the first drive respectively on positive displacement direction and negative displacement direction
Power；
When audio signal input voltage is more than or equal to the breakdown voltage of the transient voltage suppressor diode, in positive displacement direction
Nonlinear change, the transient voltage suppressor diode and two the second voice coil loudspeaker voice coils are produced with the First Driving Force on negative displacement direction
It is open-circuit condition, the nonlinear change of First Driving Force on the positive displacement direction and negative displacement direction is compensated jointly.
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| CN201710155518.6A CN106792400A (en) | 2017-03-16 | 2017-03-16 | Loudspeaker and the method for reducing loudspeaker total harmonic distortion |
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| CN201710155518.6A CN106792400A (en) | 2017-03-16 | 2017-03-16 | Loudspeaker and the method for reducing loudspeaker total harmonic distortion |
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| CN109379683A (en) * | 2018-11-06 | 2019-02-22 | 歌尔股份有限公司 | Sounding device |
| CN110662139A (en) * | 2019-09-30 | 2020-01-07 | 歌尔股份有限公司 | Sound production device and auxiliary vibration method |
| CN112423207A (en) * | 2019-08-23 | 2021-02-26 | 迪芬尼声学科技股份有限公司 | Loudspeaker, and voice coil driving system and driving method of loudspeaker |
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