CN105959884B - The compound servo-type speaker system of plane diaphragm and its control method - Google Patents
The compound servo-type speaker system of plane diaphragm and its control method Download PDFInfo
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- CN105959884B CN105959884B CN201610349000.1A CN201610349000A CN105959884B CN 105959884 B CN105959884 B CN 105959884B CN 201610349000 A CN201610349000 A CN 201610349000A CN 105959884 B CN105959884 B CN 105959884B
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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
Abstract
The present invention provides a kind of compound servo-type speaker system of plane diaphragm and its control methods, the driving coil of loudspeaker corresponds to mating one group accurate diaphragm position feedback transducer group in the system, every group of diaphragm position feedback transducer group includes at least a medium-high frequency sensing module and a low frequency sensing module, the amplitude of medium-high frequency and low frequency in the vibration of the diaphragm portion controlled respectively corresponding driving coil measures, and corresponding measuring signal is transferred to control unit, control unit realizes that the elaborate servo of high speed controls by digital algorithm, theoretically to greatest extent above-mentioned non-linear distortion control in minimum range, the integrated molding plane diaphragm of brand-new design also can be used to replace existing conical diaphragm simultaneously, it can achieve perfect waveform reduction.This is the energy converting system that an electric mechanical depth combines, and realizes that vibrating diaphragm motion amplitude and input signal basically reach consistent energy converting system.
Description
Technical field
The present invention relates to loudspeaker fields, more particularly, to a kind of compound servo of vibrating diaphragm for plane and with position feedback
Formula high-fidelity loudspeaker system structure and control method.
Background technique
Audio recording and reproducing, the history being born more than 100 years, but never obtain basic improvement.Audio recording and reproducing
Essence be desirable to restore a process of the signal of recording at some point by playback system.In theory, audio
The essence of recording-reproducing system is to go back original sound.For the energy converter at the both ends of recording-reproducing system with regard to of crucial importance, microphone therein is physics
Signal to the energy converter of electric signal is responsible for physical vibration to be converted into electric signal, and loudspeaker is electric signal to physical signal
Energy converter is responsible for converting electrical signals into physical vibration.
The history of microphone can trace back at the end of the 19th century, and the scientists such as Bell (Alexander Graham Bell) cause
Power preferably picks up the method for sound in finding, for improving last word at that time --- phone.Period, they invented
Liquid microphone and carbon granules microphone, the effect is unsatisfactory for these microphones, can barely only use.Until 1876, angstrom
Mir's Belling, which is received, has invented carbon electrode microphone, this shape seems the device of side drum than liquid microphone and carbon granules microphone
Design it is more practical, and moved Bell, it made finally to use 50,000 dollars (being equivalent to present 1,100,000 dollars) from Belling
It receives and had bought this patent in hand, by carbon electrode microphone in his phone prototype, to improve pickup effect.
Early in 1877, the ErenstVerner of Siemens just according to Fleming's Left Hand Rule, obtained moving-coil
The patent of formula loudspeaker.1898, Britain OliverLodge jazz invented cone basin loudspeaker according further to the principle of phone mouthpiece
, with we known to modern times loudspeaker it is very similar, Lodge jazz be known as " phone of roar ".But this invention but without
Method is used, because until LeeDeForest in 1906 has just invented pliotron, and it is several that available enlarger, which is made,
Year later thing, so cone basin loudspeaker just will gradually be popularized to generation nineteen thirty.
The microphone for receiving audio signal is to be received using plane, and the loudspeaker (vibrating diaphragm) of playing back audio signal are cone basin
Loudspeaker.Entire physical model is exactly mistake.At this moment because diaphragm materials decades ago and are unable to satisfy based on paper
The rigors of the rigidity of vibrating diaphragm needed for loudspeaker.Therefore rigidity can only be improved by changing vibrating diaphragm shape.Taper paper disc is exactly this
A reason, similar Haier's folding diaphragm voice unit are also to achieve the purpose that improve rigidity by changing vibrating diaphragm shape, and diamond
Voice unit is to replace more high rigidity material to achieve the goal, these designs are all for rigidly considering.
Fig. 1 is conventional loudspeakers model.As shown in Figure 1, current loudspeaker design contains the vibrating diaphragm of a mechanical damping
Limiter connects a circle support edge of outer ring, in addition coil magnetic circuit, forms a complete loudspeaker.The design of loudspeaker
Original intention is all voltage driving, and input voltage flows through generation Ampere force by coil in the magnetic line of force, so that vibrating diaphragm is pushed to move,
And this movement needs mechanical damping to offset and guarantee its linear route.Therefore, the low distortion linear route of conventional horn is suitable
It is small, in general it can accomplish that the linear movement of 10mm amplitude has been physics limit inside the loudspeaker of 8 " bores, but by
In the non-linear of mechanical damping component, reaction force can not be completely counterbalanced by the Ampere force of linear input voltage generation, therefore nothing
By which kind of mode, distortion can be all generated, only size issue, therefore the material of this mechanical damping becomes speaker sound quality
One critical material, the country is not broken through still.In addition the main problem for influencing loudspeaker transducing is the diaphagras of vibrating diaphragm (just
It is to push a point in high speed and other place moves synchronously and delays generation), therefore vibrating diaphragm rigidity is improved, it is each typhon
Factory is most difficult to solve the problems, such as, even if the frequency of diaphagras can only be improved with bullet resistant material, and not can avoid.And mesh
It is preceding to use the highest diamond of hardness on the earth, also it is only capable of accomplishing do not have diaphagras within 2 " or less small area 20kHz frequencies.Figure
2 be the scanning figure under laser interferometer an of diaphagras, it is seen that, the rigidity of vibrating diaphragm is not deposited again under high-frequency vibration
?.
In order to change the bottleneck of conventional horn sounding, various settling modes come out one after another, such as multiple loudspeaker parallel connection sounding,
But since mechanical property is inconsistent, the consistency of diaphragm oscillations is caused not can guarantee, the effect of last multiple small effect parallel connections
There is no than one typhon is good for fruit.Electrostatic loudspeaker are also a kind of new driving method, but because the rigidity of its flexible membrane
It needs to guarantee by drive system, therefore diaphragm oscillations amplitude can not be done greatly, then being doomed low frequency can not correctly restore, institute
Although pretty good with electrostatic loudspeaker Hi-Mid, low frequency is always weakness.
We analyze the approach that the distortion of conventional horn generates herein.The design principle and driving method of conventional horn
All be amplitude drives without feedback voltage, that is, input voltage and amplitude it is linear.Its principle is by magnetic field
A driving voltage is added in coil, to generate certain electric current, the electric current in coil generates Ampere force and drives vibrating diaphragm movement, and
The stroke (amplitude) of vibrating diaphragm movement is by mechanical damping (being similar to Hookean spring) limitation, and mechanical damping is bigger, then on coil
Same electric current can push the stroke of vibrating diaphragm smaller, on the contrary then bigger.In this system, in addition to the voltage of driving be it is linear it
Outside, other nonlinear factors are comparable more
1. mechanical damping is non-linear different location elastic force
2. magnetic field is in the non-linear of different location
3. the inductive effect of coil electric current at different frequencies is non-linear
4. the counter electromotive force that the coil of different motion speed generates is non-linear
5. the problem of above-mentioned described diaphagras
Summary of the invention
The main object of the present invention is to provide a kind of New-type loudspeaker system.The system eliminates conventional horn vibrating diaphragm amplitude
By the design of mechanical damping clipping, the driving structure and method of accurate feedback are introduced, in addition, having abandoned original loudspeaker system
The conical diaphragm structure of system using plane formula vibrating diaphragm, and thereby solves the various non-linear distortions of conventional horn system, passes through drive
Dynamic device and horn system depth, which combine, reaches being identical for amplitude and input signal.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of speaker system, including loudspeaker and control unit, the loudspeaker include support frame, magnet assembly, vibration
Film and driving coil；The vibrating diaphragm includes vibrating diaphragm body and voice coil suspension；
It is characterized in that,
The driving coil corresponds to mating one group accurate diaphragm position feedback transducer group, and every group of diaphragm position feedback passes
Sensor group detects the vibration for the diaphragm portion that corresponding driving coil is controlled；Every group of diaphragm position feedback transducer group is at least wrapped
Include a medium-high frequency sensing module and a low frequency sensing module, the vibration of the diaphragm portion controlled respectively corresponding driving coil
In medium-high frequency and the amplitude of low frequency measure, and corresponding measuring signal is transferred to control unit.
Further, described control unit includes: audio signal DSP module, distortion adjustment module, low-frequency distortion calculating mould
Block, medium-high frequency predistortion module, power amplifier module；
The audio signal DSP module handles the digital audio and video signals of input and exports three road signals:
First via audio signal is input to distortion adjustment module；
Second tunnel audio signal is input to " low-frequency distortion computing module "；
Third road audio signal is input to " medium-high frequency predistortion computing module "；
The low frequency sensing module output low frequency feedback signal to " low-frequency distortion computing module ", the medium-high frequency senses mould
Block exports medium-high frequency feedback signal to " medium-high frequency predistortion computing module "；
Input signal after the low-frequency distortion computing module is handled the second tunnel audio signal and low frequency feedback signal
Module is adjusted to distortion；
The medium-high frequency predistortion computing module is defeated after being handled third road audio signal with medium-high frequency feedback signal
Enter to distortion and adjusts module；
Distortion adjustment module will export after treated signal is input to power amplifier module carries out power amplification to
The driving coil of corresponding control, to drive corresponding diaphragm oscillations sounding.
Further, the vibrating diaphragm body is flat plate body, and driving coil is directly wound on voice coil suspension；Vibrating diaphragm
It is coupled between the edge and support frame of vibrating diaphragm body by suspension parts, to allow vibrating diaphragm body along perpendicular to doing on the direction of vibrating diaphragm body
Linear motion；
Further, the projection of shape of the vibrating diaphragm body is round, rectangular, triangle or equilateral polygon.
Further, multiple reinforcing ribs are provided on the vibrating diaphragm body.
Further, vibrating diaphragm body, voice coil suspension and the reinforcing rib of vibrating diaphragm are integrally formed；And used material is high rigidity
Material (such as ceramics, light alloy etc.).
Further, suspension parts are ring bodies, are coupled between support frame and the edge of vibrating diaphragm body by the ring bodies；Or it is outstanding
It hangs component to be collectively constituted by multiple monomers, multiple monomers are distributed between support frame and the edge of vibrating diaphragm body, and each monomer is responsible for
The coupling of a bit.
Further, each vibrating diaphragm is equipped with multiple groups driving coil, and every group of driving coil corresponds to mating one group accurate vibrating diaphragm position
Set feedback transducer group.
Further, the low frequency sensing module uses precise grating sensor or capacitor grid transducer；The medium-high frequency sensing
Module uses capacitive pressure transducer or piezoelectric transducer.
Further, the magnet assembly is the standard magnet component that annular magnet adds T-type iron block, either for one or more
A electromagnet.
The present invention also provides a kind of speaker control method, specifically:
The speaker system includes loudspeaker and control unit, and the loudspeaker includes support frame, magnet assembly, vibrating diaphragm
And driving coil；The vibrating diaphragm includes vibrating diaphragm body and voice coil suspension；
The driving coil corresponds to mating one group accurate diaphragm position feedback transducer group, and every group of diaphragm position feedback passes
Sensor group detects the vibration for the diaphragm portion that corresponding driving coil is controlled；Every group of diaphragm position feedback transducer group is at least wrapped
Include a medium-high frequency sensing module and a low frequency sensing module, the vibration of the diaphragm portion controlled respectively corresponding driving coil
In medium-high frequency and the amplitude of low frequency measure, and corresponding measuring signal is transferred to control unit；
Described control unit includes: audio signal DSP module, distortion adjustment module, low-frequency distortion computing module, medium-high frequency
Predistortion module, power amplifier module；
The audio signal DSP module handles the digital audio and video signals of input, exports three road signals:
First via audio signal is to contain the full range signal of low-frequency range and medium-high frequency range, is input to distortion adjustment
Module；
Second tunnel audio signal is only the low frequency signal in low-frequency range, is input to " low-frequency distortion computing module "；
Third road audio signal is only the high frequency signal within the scope of medium-high frequency, is input to " medium-high frequency predistortion calculating
Module "；
First via audio signal is input to distortion adjustment module and is input to power amplification after distortion adjusts resume module
Output is to the corresponding driving coil controlled after module carries out power amplification, to drive corresponding diaphragm oscillations sounding；
The low frequency sensing module output low frequency feedback signal tremendously low frequency distortion computation module, the medium-high frequency sensing module
Medium-high frequency feedback signal is exported to medium-high frequency predistortion computing module；
The low-frequency distortion computing module carries out the second tunnel audio signal, that is, low frequency signal and low frequency feedback signal
Compare the difference for obtaining both low frequency input waveform and low frequency output waveform, i.e. low frequency signal input-output wave shape difference or low
Low-frequency distortion value is input to distortion adjustment module by frequency distortion value, low-frequency distortion computing module；
The medium-high frequency predistortion computing module feeds back third road audio signal, that is, high frequency signal and medium-high frequency
Signal is compared the difference for obtaining both medium-high frequency input waveform and medium-high frequency output waveform, i.e. high frequency signal input and output
Medium-high frequency distortion value is input to distortion adjustment mould by different wave shape or medium-high frequency distortion value, medium-high frequency predistortion computing module
Block；
Low-frequency distortion value is reversely added in full range signal by the distortion adjustment module, or low-frequency distortion value is anti-
To the low frequency signal part being added in full range signal；Meanwhile it being distorted adjustment module and medium-high frequency distortion value is reversely added to entirely
In frequency signal, or the high frequency signal part that medium-high frequency distortion value is reversely added in full range signal；The distortion is adjusted
Mould preparation block will be input to after power amplifier module carries out power amplification through above-mentioned signal adjusted export to corresponding control again
Driving coil, to drive corresponding diaphragm oscillations sounding.
Further, method is obtained for medium-high frequency distortion value, can also adopted otherwise:
The medium-high frequency predistortion computing module (interior database have rule of thumb data setting in advance with it is corresponding
Medium-high frequency feedback signal value or the corresponding preset medium-high frequency distortion value of the corresponding high frequency signal, medium-high frequency predistortion meter
Module is calculated according to the medium-high frequency feedback signal inputted by medium-high frequency sensing module or the third road inputted by audio signal DSP module
Audio signal, that is, high frequency signal carries out processing of tabling look-up, and corresponding preset medium-high frequency distortion value is extracted out of database,
The medium-high frequency distortion value of extraction is input to distortion adjustment module.
Compared with the existing technology, present invention has the advantage that
By introducing accurate position sensing device collected diaphragm position accurate feedback to signal amplifier, pass through
The mode of signal amplifier servo-drive accurately controls amplitude, thus can give control unit the problem of mechanical part,
The elaborate servo control that high speed is realized by digital algorithm, theoretically to greatest extent controls above-mentioned non-linear distortion most
In small range, while the integrated molding plane diaphragm of brand-new design also can be used to replace existing conical diaphragm, thus may be used
Theoretically to reach perfect waveform reduction.This is the energy converting system that an electric mechanical depth combines, to realize vibrating diaphragm
Motion amplitude and input signal basically reach consistent energy converting system.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of existing loudspeaker；
Fig. 2 is scanning figure of the diaphagras of existing loudspeaker under laser interferometer.
Fig. 3 and Fig. 4 is respectively loudspeaker side sectional view and schematic top plan view of the invention with position feedback；
Fig. 5 is the structure and working principle figure of speaker system of the present invention；
Fig. 6 is that vibrating diaphragm uses rectangular structural schematic diagram, also can be used as one group of driving coil of example and drives single vibrating diaphragm
Schematic diagram；
Fig. 7 is the structural schematic diagram that single vibrating diaphragm is driven by two groups of driving coils.
Part description of symbols:
1- suspension parts；2- magnet assembly；3- vibrating diaphragm；4- driving coil；5- reinforcing rib；6- diaphragm position feedback transducer
Group；7- support frame；8- voice coil suspension.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 3 and Fig. 4 is respectively loudspeaker side sectional view and schematic top plan view with position feedback.As shown, this hair
The component part of loudspeaker in bright speaker system is most of consistent with conventional loudspeakers, includes support frame 7, magnet group
Part 2, the vibrating diaphragm including vibrating diaphragm body 3 and voice coil suspension 8 and driving coil (or referred to as voice coil) 4；
But vibrating diaphragm body 3 of the invention is flat plate body (or platysome), moreover, the projection of shape of vibrating diaphragm body 3 is not only
It can be circle as shown in Figure 4, or other shapes such as shown in FIG. 6 rectangular or triangle, equilateral polygon
Shape；To improve its intensity, also settable multiple reinforcing ribs 5 (according to thickness thinning outside stress intensity radiation direction) on vibrating diaphragm body are driven
Moving winding (4) is directly wound on voice coil suspension 8, conventional loudspeakers is omitted, coil is needed to paste this ring of vibrating diaphragm
Section.
Vibrating diaphragm body 3, voice coil suspension 8 and the reinforcing rib 5 of vibrating diaphragm can be integrally formed, and used material can be for using high
Hardened material (such as ceramics, light alloy etc.).
It is coupled between the edge and support frame 7 of the vibrating diaphragm body 3 of vibrating diaphragm by suspension parts 1, to allow vibrating diaphragm body 3 along vertical
It is moved in a straight line on the direction of vibrating diaphragm body 3；In loadspeaker structure of the present invention, vibrating diaphragm body is only suspended on by suspension parts 1
On support frame 7, do not play the role of limiting 3 Oscillation Amplitude of vibrating diaphragm body, i.e., loudspeaker of the invention eliminates conventional horn
Mechanical damping (damping) clipping mode.Suspension parts 1 can be hung using traditional ring type, i.e. support frame 7 and vibrating diaphragm
It is coupled between the edge of body 3 by the cyclic annular suspension parts of an one；Be also possible to multipoint mode suspension, i.e., suspension parts 1 by
Multiple monomers collectively constitute, and multiple monomers are distributed between support frame 7 and the edge of vibrating diaphragm body 3, and each monomer is responsible for a bit
Coupling, example as shown in Figure 4, suspension parts 1 are distributed in the side of support frame 7 Yu vibrating diaphragm body 3 by four monomer compositions, four monomers
Between edge.The material of suspension parts can be traditional rubber, foam or composite high-elastic material, and metal elastic also can be used
Spring or metal clips are made.Stringent, the main purpose of the absolutely not original mechanical damping selection of this suspension selection
It is for linear motion to be just to maintain vibrating diaphragm body.Equally, between voice coil suspension and magnet assembly 2 can also be by suspension similar to the above
Component mutually couples.
One vibrating diaphragm can configure one group of driving coil 4 (as shown in Figure 3 and Figure 6), can also be equipped with multiple groups driving coil 4
(as shown in fig. 7, being driven by two groups of driving coils 4,8 meanings are voice coil suspension, that is, 4 institute of corresponding driving coil is in place
It sets).Loudspeaker of the present invention will realize correct driving, often because eliminating traditional mechanical damping clipping mode
One group of driving coil has all corresponded to one group of accurate diaphragm position feedback transducer group 6 mating, every group of diaphragm position feedback sense
Device group 6 detects the vibration for the diaphragm portion that corresponding driving coil is controlled；Every group of diaphragm position feedback transducer group includes most
Less by 2 sensors, i.e. medium-high frequency sensing module 68 and low frequency sensing module 67 (as shown in Figure 5), respectively to corresponding driving
The amplitude of medium-high frequency (Hi-Mid) and low frequency (bass) in the vibration for the diaphragm portion that coil is controlled measures, to meet
Sound system medium-high frequency amplitude is far smaller than the actual conditions of low frequency amplitude, and (frequency often doubles, and amplitude is exactly original 1/
4, if that is, if the amplitude of 20Hz reaches 1 meter under same acoustic pressure in the case where, the amplitude of 20000Hz is only less than 0.2
Micron)；
Precise grating sensor can be used in low frequency sensing module 67 (large amplitude sensor), can also be sensed using capacitive grating
Device etc.；Medium-high frequency sensing module 68 (detection of the small amplitude of high frequency) can use capacitive pressure transducer or piezoelectric transducer,
Two kinds or more than the measurement of sensor group the amplitude of entire vibrating diaphragm can be obtained by digital audio mixing.Pass through high-speed sampling
To obtain the accurate location information of vibrating diaphragm, control unit is fed back to realize the control to diaphragm position.The side of digital calibration
Formula is higher than the control precision of mechanical damping because mechanical damping has different responses to temperature, humidity, frequency, and with when
Between passage, physics qualitative change (aging) can occur for material, to influence its reduction effect, and digital calibration belongs to real-time closed-loop
Calibration, controllable degree is more accurate than the open loop approach of mechanical damping, and can be with periodic calibration, so as to avoid mechanical damping production
Raw various drawbacks.The drive mode of two groups of driving coils of example as shown in Figure 7 can because having used accurate position feedback technology
It accurately to allow very much 2 coils to move synchronously, therefore is not in the inconsistent problem of vibration of traditional multi-loudspeaker.
The standard magnet group that general loudspeaker annular magnet adds T-type iron block can be used in magnet assembly 2 used in loudspeaker
Part, or replace with one or more electromagnet the excitation mode of permanent magnet, when driving voltage is added, driving coil
Electric current generates Ampere force in magnetic field, and propelling coil skeleton (8) movement finally gives off so that entire vibrating diaphragm (3) be driven to move
Sound wave.
Fig. 5 is the working principle diagram of speaker system.As shown in figure 5, the control unit in speaker system of the invention
Include: audio signal DSP module 13, distortion adjustment module 14, low-frequency distortion computing module 17, medium-high frequency predistortion module 18,
Power amplifier module 15, ADC Analog-digital Converter module 11 and signal shifter 12.
As shown in figure 5, passing through if the audio input signal of access is analog signal (i.e. analog audio input signal)
ADC Analog-digital Converter module 11 carries out analog/digital conversion in figure, generates pure digi-tal signal, is input to signal shifter 12；If
Audio input signal is pure digi-tal signal (i.e. digital audio input signal), then signal is directly entered signal shifter 12, number
Audio input signal enters " audio signal DSP module 13 " after the gating of signal shifter 12；
Audio signal DSP module 13 is handled (transformation generates PWM/PDM waveform) to digital audio and video signals, exports three tunnels
Signal:
First via audio signal is to contain the full range signal of low-frequency range and medium-high frequency range, is input to distortion adjustment
Module 14；
Second tunnel audio signal is only the low frequency signal in low-frequency range, is input to " low-frequency distortion computing module " 17；
Third road audio signal is only the high frequency signal within the scope of medium-high frequency, is input to " medium-high frequency predistortion calculating
Module " 18；
Because being loudspeaker field present document relates to field, therefore low frequency and medium-high frequency herein is also usual in loudspeaker field
Signified frequency range is also applied for the normal of low frequency in loudspeaker field and medium-high frequency to the criteria for classifying of low frequency and medium-high frequency
The criteria for classifying seen.Certainly, preferable range can also are as follows: low frequency or low-frequency range refer to more than or equal to 20 hertz, be less than or equal to
150 hertz of range, corresponding low frequency signal are more than or equal to 20 hertz, the audio signal less than or equal to 150 hertz；Medium-high frequency
Or medium-high frequency range refers to more than or equal to 150 hertz, the range less than or equal to 20000 hertz, corresponding high frequency signal, that is, big
In equal to 150 hertz, the audio signal less than or equal to 20000 hertz；
Above-mentioned first via audio signal (full range signal) is input to distortion adjustment module 14, at distortion adjustment module 14
After reason, it is input to after power amplifier module 15 carries out power amplification and exports to the driving coil 4 of corresponding control, to drive corresponding shake
Film vibration sounding；
As shown in Figure 5, the corresponding one group of diaphragm position feedback transducer group of each driving coil 4, every group of diaphragm position are anti-
Infeed sensor device group includes the low frequency sensing module 67 of the low frequency signal of an induction diaphragm oscillations and the middle height of an induction diaphragm oscillations
The medium-high frequency sensing module 68 of frequency signal, 67 output low frequency feedback signal of low frequency sensing module to " low-frequency distortion computing module "
17, medium-high frequency sensing module 68 exports medium-high frequency feedback signal to " medium-high frequency predistortion computing module " 18；
The low-frequency distortion computing module 17 will (by audio signal DSP module 13 input Lai) the second tunnel audio signal is
The low frequency signal (represent low frequency input waveform) with (by low frequency sensing module 67 input come) low frequency feedback signal (representative
Low frequency output waveform) be compared the difference for obtaining both low frequency input waveform and low frequency output waveform, i.e. low frequency signal is defeated
Enter output waveform difference or low-frequency distortion value, low-frequency distortion value is input to distortion adjustment module by low-frequency distortion computing module 17
14；
The medium-high frequency predistortion computing module 18 is by (being inputted by audio signal DSP module 13) third road audio signal
The i.e. described high frequency signal (represent medium-high frequency input waveform) and (being inputted by medium-high frequency sensing module 68) medium-high frequency are fed back
Signal (represent medium-high frequency output waveform) is compared the difference for obtaining both medium-high frequency input waveform and medium-high frequency output waveform
Different, i.e. high frequency signal input-output wave shape difference or medium-high frequency distortion value, medium-high frequency predistortion computing module 18 is by middle height
Frequency distortion value is input to distortion adjustment module 14；
(being inputted by low-frequency distortion computing module 17) low-frequency distortion value is then reversely superimposed by the distortion adjustment module 14
It is reversely added to full range signal into (being inputted by audio signal DSP module 13) full range signal, or by low-frequency distortion value
In low frequency signal part；Meanwhile adjustment module 14 is distorted by (being inputted by medium-high frequency predistortion computing module 18) medium-high frequency
Distortion value is reversely added to and (is inputted by audio signal DSP module 13) in full range signal, or medium-high frequency distortion value is anti-
To the high frequency signal part for being added to and (being inputted by audio signal DSP module 13) in full range signal；It realizes incoming wave
The difference of shape and output waveform is reversely added in input waveform, to inhibit distortion to greatest extent, this is that a number is negative
The process of feedback.The distortion adjustment module 14 will be input to power amplifier module 15 through above-mentioned signal (waveform) adjusted again
Output is to the corresponding driving coil 4 controlled after carrying out power amplification, to drive corresponding diaphragm oscillations sounding.
The above are the principle of the present invention, i.e., obtain the low frequency feedback signal and medium-high frequency of diaphragm position respectively by sensor
Low frequency feedback signal is compared with the low frequency signal in audio input signal and obtains low-frequency distortion value by feedback signal, will in
High frequency feedback signal is compared with the high frequency signal in audio input signal obtains medium-high frequency distortion value, then by low-frequency distortion
Value and medium-high frequency distortion value are reversely superimposed on audio input signal simultaneously, to inhibit diaphragm oscillations amplitude to greatest extent
Distortion inhibits loudspeaker to reappear the distortion of sound, is a kind of negative feedback process using digitized processing.
Method is obtained for medium-high frequency distortion value, other scheme can also be used:
Due to high-frequency signal may inconvenient real-time negative feedback or higher cost, can rule of thumb data may
Medium-high frequency distortion value be reversely added to input signal, specifically:
Database in the medium-high frequency predistortion computing module 18 have rule of thumb data setting in advance with it is corresponding
Medium-high frequency feedback signal value or the corresponding preset medium-high frequency distortion value of the corresponding high frequency signal, medium-high frequency predistortion
Computing module 18 is according to (being inputted by medium-high frequency sensing module 68) medium-high frequency feedback signal or (by audio signal DSP module 13
Input) third road audio signal, that is, high frequency signal carries out processing of tabling look-up, it is extracted out of database preset accordingly
The medium-high frequency distortion value of extraction is input to distortion adjustment module 14 by medium-high frequency distortion value, and next distortion adjusts module 14
Processing method is then same as described above, repeats no more.
In addition, not only the monomer shape of the vibrating diaphragm body of loudspeaker can be multiplicity, loudspeaker can also be by multiple vibrating diaphragms
Body composition and driving point can be adjusted according to rigid demand, and toy trumpet can be carried out with the mode of a traditional coil
Driving, if the rectangle vibrating diaphragm of the special-shaped vibrating diaphragm such as following figure, can take the two ways of Fig. 7, (8) are driving coil in Fig. 7
Position, (5) are reinforcing rib.
Furthermore control unit of the invention and corresponding diaphragm position feedback transducer group also can be applied to using biography
On the loudspeaker of system loadspeaker structure, for example it is applied on existing cone basin formula loudspeaker, although vibrating diaphragm is cone basin formula, but
Using the combination of diaphragm position feedback transducer group and control unit of the invention, certain sound quality castering action can be also played.
Specifically repeat no more.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of speaker system, speaker system, including loudspeaker and control unit, the loudspeaker include support frame (7),
Magnet assembly (2), vibrating diaphragm and driving coil (4)；The vibrating diaphragm includes vibrating diaphragm body (3) and voice coil suspension (8)；
It is characterized in that,
The driving coil corresponds to mating one group of diaphragm position feedback transducer group (6), every group of diaphragm position feedback transducer group
(6) vibration for the diaphragm portion that corresponding driving coil is controlled is detected；Every group of diaphragm position feedback transducer group includes at least
One medium-high frequency sensing module (68) and a low frequency sensing module (67), the diaphragm portion that corresponding driving coil is controlled respectively
Vibration in medium-high frequency and the amplitude of low frequency measure, and corresponding measuring signal is transferred to control unit；
Described control unit includes: audio signal DSP module (13), distortion adjustment module (14), low-frequency distortion computing module
(17), medium-high frequency predistortion module (18), power amplifier module (15)；
The audio signal DSP module (13) handles the digital audio and video signals of input and exports three road signals:
First via audio signal is input to distortion adjustment module (14)；
Second tunnel audio signal is input to " low-frequency distortion computing module " (17)；
Third road audio signal is input to " medium-high frequency predistortion computing module " (18)；
The low frequency sensing module (67) outputs signal to low-frequency distortion computing module (17), the medium-high frequency sensing module (68)
Output signal to medium-high frequency predistortion computing module (18)；
The low-frequency distortion computing module (17) outputs signal to distortion adjustment module (14)；
The medium-high frequency predistortion computing module (18) outputs signal to distortion adjustment module (14)；
Distortion adjustment module (14) outputs signal to power amplifier module (15), power amplifier module (15) the output letter
Number to corresponding control driving coil (4).
2. speaker system according to claim 1, it is characterised in that: the vibrating diaphragm body (3) is flat plate body, is driven
Moving winding (4) is directly wound on voice coil suspension (8)；By outstanding between the edge and support frame (7) of the vibrating diaphragm body (3) of vibrating diaphragm
Component (1) coupling is hung, to allow vibrating diaphragm body (3) along perpendicular to moving in a straight line on the direction of vibrating diaphragm body (3).
3. speaker system according to claim 2, it is characterised in that: the projection of shape of the vibrating diaphragm body (3) be it is round,
Rectangular, triangle or equilateral polygon.
4. speaker system according to claim 2, it is characterised in that: be provided with multiple reinforcing ribs on the vibrating diaphragm body
(5)。
5. speaker system according to claim 4, it is characterised in that: the vibrating diaphragm body (3) of vibrating diaphragm, voice coil suspension (8) and
Reinforcing rib (5) is integrally formed；And used material is high hardness material.
6. speaker system according to claim 4, it is characterised in that: the suspension parts (1) are ring bodies, support frame
(7) it is coupled between the edge of vibrating diaphragm body (3) by the ring bodies；
Or
The suspension parts (1) are collectively constituted by multiple monomers, and multiple monomers are distributed in the side of support frame (7) Yu vibrating diaphragm body (3)
Between edge, each monomer is responsible for the coupling of a bit.
7. speaker system according to claim 1, it is characterised in that: each vibrating diaphragm outfit multiple groups driving coil 4, every group
Driving coil corresponds to mating one group accurate diaphragm position feedback transducer group (6).
8. a kind of speaker system control method, it is characterised in that:
The speaker system includes loudspeaker and control unit, and the loudspeaker includes support frame (7), magnet assembly (2), vibration
Film and driving coil (4)；The vibrating diaphragm includes vibrating diaphragm body (3) and voice coil suspension (8)；
The driving coil corresponds to mating one group of diaphragm position feedback transducer group (6), every group of diaphragm position feedback transducer group
(6) vibration for the diaphragm portion that corresponding driving coil is controlled is detected；Every group of diaphragm position feedback transducer group includes at least
One medium-high frequency sensing module (68) and a low frequency sensing module (67), the diaphragm portion that corresponding driving coil is controlled respectively
Vibration in medium-high frequency and the amplitude of low frequency measure, and corresponding measuring signal is transferred to control unit；
Described control unit includes: audio signal DSP module (13), distortion adjustment module (14), low-frequency distortion computing module
(17), medium-high frequency predistortion module (18), power amplifier module (15)；
The audio signal DSP module (13) handles the digital audio and video signals of input, exports three road signals:
First via audio signal is to contain the full range signal of low-frequency range and medium-high frequency range, is input to distortion adjustment module
(14)；
Second tunnel audio signal is only the low frequency signal in low-frequency range, is input to " low-frequency distortion computing module " (17)；
Third road audio signal is only the high frequency signal within the scope of medium-high frequency, is input to " medium-high frequency predistortion computing module "
(18)；
First via audio signal is input to distortion adjustment module (14), after distortion adjustment module (14) processing, is input to power
Output is to the corresponding driving coil (4) controlled after amplification module (15) carries out power amplification, to drive corresponding diaphragm oscillations sounding；
Low frequency sensing module (67) the output low frequency feedback signal tremendously low frequency distortion computation module (17), the medium-high frequency sensing
Module (68) exports medium-high frequency feedback signal to medium-high frequency predistortion computing module (18)；
The low-frequency distortion computing module (17) carries out the second tunnel audio signal, that is, low frequency signal and low frequency feedback signal
Compare the difference for obtaining both low frequency input waveform and low frequency output waveform, i.e. low frequency signal input-output wave shape difference or low
Low-frequency distortion value is input to distortion adjustment module (14) by frequency distortion value, low-frequency distortion computing module (17)；
The medium-high frequency predistortion computing module (18) feeds back third road audio signal, that is, high frequency signal and medium-high frequency
Signal is compared the difference for obtaining both medium-high frequency input waveform and medium-high frequency output waveform, i.e. high frequency signal input and output
Medium-high frequency distortion value is input to distortion adjustment by different wave shape or medium-high frequency distortion value, medium-high frequency predistortion computing module (18)
Module (14)；
Low-frequency distortion value is reversely added in full range signal by distortion adjustment module (14), or low-frequency distortion value is anti-
To the low frequency signal part being added in full range signal；Meanwhile it being distorted adjustment module (14) and being reversely superimposed medium-high frequency distortion value
Into full range signal, or the high frequency signal part that medium-high frequency distortion value is reversely added in full range signal；The mistake
True adjustment module (14) will be input to after power amplifier module (15) carry out power amplification through above-mentioned signal adjusted export again
To the driving coil (4) of corresponding control, to drive corresponding diaphragm oscillations sounding.
9. speaker system control method according to claim 8, it is characterised in that:
It is described that " medium-high frequency predistortion computing module (18) is anti-by third road audio signal, that is, high frequency signal and medium-high frequency
Feedback signal is compared the difference for obtaining both medium-high frequency input waveform and medium-high frequency output waveform, i.e. high frequency signal input is defeated
Medium-high frequency distortion value is input to distortion and adjusted by different wave shape or medium-high frequency distortion value out, medium-high frequency predistortion computing module (18)
Mould preparation block (14) " is replaced with such as under type:
Database in the medium-high frequency predistortion computing module (18) have rule of thumb data setting in advance with it is corresponding
Medium-high frequency feedback signal value or the corresponding preset medium-high frequency distortion value of the corresponding high frequency signal, medium-high frequency predistortion meter
Module (18) are calculated according to the medium-high frequency feedback signal by medium-high frequency sensing module (68) input or by audio signal DSP module (13)
Third road audio signal, that is, high frequency signal of input carries out processing of tabling look-up, and extracts in preset accordingly from database
The medium-high frequency distortion value of extraction is input to distortion adjustment module (14) by high frequency distortion value.
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| EP3300388A1 (en) * | 2016-09-27 | 2018-03-28 | Sound Solutions International Co., Ltd. | Mobile device and system comprising a loudspeaker and an amplifyer |
| CN106360935B (en) * | 2016-12-05 | 2019-01-25 | 广州市众慧信息技术有限公司 | A kind of music packet |
| CN107071670B (en) * | 2017-05-31 | 2019-10-25 | 努比亚技术有限公司 | Loudspeaker, mobile terminal, control method and computer-readable medium |
| CN107820165A (en) * | 2017-09-29 | 2018-03-20 | 努比亚技术有限公司 | A kind of method, equipment and computer-readable recording medium for realizing audio frequency process |
| DE102017010048A1 (en) * | 2017-10-27 | 2019-05-02 | Paragon Ag | Method for designing and manufacturing loudspeakers for public address systems, in particular, used in motor vehicle interiors |
| CN108845594B (en) * | 2018-06-12 | 2021-05-28 | 太原理工大学 | Vibration harmonic iterative control method based on transfer function |
| US20210021918A1 (en) * | 2018-09-06 | 2021-01-21 | Goertek Inc. | Method for displacement measurement in a driver and speaker |
| CN109855723B (en) * | 2019-01-16 | 2023-04-07 | 山东理工大学 | Testing system and testing method for cavity temperature transfer characteristic curve |
| CN218041763U (en) * | 2022-06-29 | 2022-12-13 | 瑞声光电科技(常州)有限公司 | Loudspeaker box |
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