CN110349562A - A kind of active noise reducing device - Google Patents
A kind of active noise reducing device Download PDFInfo
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- CN110349562A CN110349562A CN201910703541.3A CN201910703541A CN110349562A CN 110349562 A CN110349562 A CN 110349562A CN 201910703541 A CN201910703541 A CN 201910703541A CN 110349562 A CN110349562 A CN 110349562A
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- active noise
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- noise reduction
- reducing device
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention relates to a kind of active noise reducing devices, comprising: device noumenon；For connecting the fixed cell of vibration source；For detecting the vibration detecting unit of vibration source vibration signal；Including for using active noise reduction algorithm process vibration source vibration signal and generating the active noise reduction processing unit of denoised signal；For generating the vibration generating unit for offsetting vibration source vibration signal according to denoised signal；The vibration detecting unit and active noise reduction processing unit are electrically connected；Active noise reduction processing unit and vibration generating unit are electrically connected；The active noise reduction processing unit is set on circuit board, and the circuit board further includes power supply unit.Active noise reducing device good portability of the present invention is easy installation, easy to operate, does not need to carry out specially constructing i.e. to room can be used, there is good environment involvement degree.
Description
Technical field
The present invention relates to noise reduction technology fields, in particular to a kind of active noise reducing device.
Background technique
In Modern Urban Living, various lives production set, motor vehicle, construction etc., and noise pollution is seen everywhere, and is made an uproar
Sound can not only allow people to have the fidgets, seriously affect sleep and mental health, and high intensity noise results even in physiological and psychology
The permanent damage of property.Important pollution one of of the noise pollution as today's society occupies environmental protection for a long time and complains 40% or more.
In order to reduce noise pollution, some traditional passive noise reduction technologies such as sound control glass, hollow glass are widely used,
Passive noise reduction technology is highly effective for high-frequency noise isolation, but can not be effectively isolated the noise of middle low frequency, and common friendship
The Middle and low frequency noises accountings such as logical noise, domestic noise are very high.Active noise reduction techniques are isolated Middle and low frequency noise and are cut down very
Effectively, the demand that a noise eliminator using active noise reduction techniques is used to improve resident living Middle and low frequency noise level is researched and developed
It is more more and more urgent.
Summary of the invention
The present invention is based on problems of the existing technology, provide a kind of active noise reducing device, and the device is with time delay is small, has
Imitate the wide advantage of working frequency range.
The present invention is achieved by the following technical solution:
A kind of active noise reducing device, comprising:
Device noumenon；For connecting the fixed cell of vibration source；
For detecting the vibration detecting unit of vibration source vibration signal；
Including for using active noise reduction algorithm process vibration source vibration signal and generating at the active noise reduction of denoised signal
Manage unit；
For generating the vibration generating unit for offsetting vibration source vibration signal according to denoised signal；
The vibration detecting unit and active noise reduction processing unit are electrically connected；Active noise reduction processing unit and vibration occur
Unit is electrically connected；
The active noise reduction processing unit is set on circuit board, and the circuit board further includes power supply unit.
In a specific embodiment of the invention, the vibration detecting unit is the non-contact vibration measuring unit of laser, anti-using laser
The non-contact vibration signal for obtaining vibration source is penetrated to reach extremely low delay requirement (about 10 microsecond), including integrated optics chip
Such as the GP64- processor of Keyemce, semiconductor Laser device, optical lens group, photosensitive element such as CMOS or PSD etc., DSP processing
Chip etc., the micron order vibration on glass are converted into electric signal, and outflow is used to circuit board, and measurement accuracy, range are with timely
Prolong control to need to match with target noise, i.e., measurement accuracy needs to meet micron order requirement, range needs to reach grade and wants
It asks, time delay needs to control that accurate glass vibration signal i.e. input noise signal can be exported in time in Microsecond grade.It can directly adopt
With the custom mold group of producer in the industry, for example, Keyemce LK-G5000 series and sincere photosensitive son miniature laser sensing platform MD system
Column, to guarantee that measuring time delay can achieve within 10 microseconds.
In a specific embodiment of the invention, the active noise reduction processing unit includes filter unit, A/D converting unit, master
Processor, D/A converting unit, noise reduction algorithm unit can produce frequency in special frequency band by quick active noise reduction algorithm
The vibration signal that rate is identical as input noise signal, phase is opposite with input noise signal, the unit need extremely strong processing
Ability, as far as possible reduction system processing delay.
In a specific embodiment of the invention, the primary processor is selected from the arm processor including STM32 series, TM320 system
It is a kind of in the dsp processor or FPGA processor of column.
In a specific embodiment of the invention, common AP and LMS scheduling algorithm is can be used in active noise reduction algorithm, with LMS algorithm
For sketch algorithm implementation principle: by LMS algorithm module based on A/D conversion after noise data, obtain the n moment noise
Data d (n) is used as noise signal, based on the glass vibration input noise signal after A/D conversion, obtains x (n) conduct at n moment
The input signal of filter, and filter is obtained in the output signal of the output data y (n) as filter at n moment；It will output
Data y (n) obtains error e (n) between the two compared with noise data d (n)；It is corrected by the error e (n) at the n moment
The weight coefficient w (n) of filter, successively iteration, finally makes e (n) progressively reach minimum value；The final output letter for generating filter
Number, as denoised signal.
In a specific embodiment of the invention, the vibration generating unit is giant magnetostrictive material actuator, output end
For mandril, ram surface is equipped with glue surface.
Giant magnetostrictive material actuator is made of giant magnetostrictive material, to meet wanting for system Microsecond grade low time delay
It asks, about 10 microseconds, the length of giant magnetostrictive material is 20-100mm, diameter 1-5mm.In terms of length, ultra-magnetic telescopic
The strain rate of material is about one thousandth, and the dependent variable of 0.5mm can both cover the vibration displacement of most of scene on glass,
It can guarantee that small product size is moderate again, so recommending the length of 50mm；It is main to consider that giant magnetostrictive material is held in diametrically
By the ability of shear stress, recommend the material for selecting diameter 5mm.The vibration output end of giant magnetostrictive material actuator is top
Bar, mandril top surface is preferably circular, and research finds to be more advantageous to transmitting of the noise on glass, is equipped in mandril top surface suitable thick
The strength glue surface of degree not only needs to eliminate influence of the pit out-of-flatness of glass surface to force direction, but also needs to guarantee the glue
Face thickness does not generate biggish buffering, reduces the intensity of reversal of vibrations, and thickness recommends 0.5mm, giant magnetostrictive material actuation
Device is fastenedly connected by the glue surface and glass realization, guarantees the biography of the signal of giant magnetostrictive material actuator sending promptly and accurately
It is delivered in target glass.
In a specific embodiment of the invention, the fixed cell and vibration source contact surface are equipped with annular glue surface, can will set
Standby firm stable is fixed on vibration source, such as glass.
In a specific embodiment of the invention, the circuit board is additionally provided with wireless communication module, the wireless communication module packet
Include bluetooth or WIFI module.
In a specific embodiment of the invention, described device ontology is equipped with including power switch, laser warning lamp and operation shape
State indicator light is electrically connected on corresponding interface on mainboard respectively.
The non-contact vibration measuring unit of laser needs to include necessary vibration reducing measure between shell, for example rubber damping pad and subtracts
Shake rubber screw etc..Guarantee that the non-contact vibration measuring unit vibration of laser is small as far as possible, reduces the influence to vibration signal.
The present invention also provides the noise reduction process that above-mentioned active noise reducing device is applied to middle low frequency noise, are such as installed on room
On interior glass, on the glass of the vehicles include automobile, train, steamer, aircraft, smoke exhaust ventilator casing on etc..
The present invention also provides a kind of active denoising methods, and above-mentioned active noise reducing device is placed on vibration source, open
Active noise reducing device carries out noise reduction.
Device noumenon using giant magnetostrictive material actuator as central axes, giant magnetostrictive material actuator provide screw or
The form of person's buckle is mutually fixedly connected with shell, and giant magnetostrictive material actuator top layout is welded with active noise reduction unit
Circuit board, integrated security low-voltage DC supply unit on circuit board, configures additional ac-dc switching power and is powered, circuit
Plate is fixed by screws on shell.Giant magnetostrictive material actuator is believed with circuit board by giant magnetostrictive material actuator
The forms connection such as number line or contact pin, realizes signal transmission and power supply.The non-contact vibration measuring unit of laser passes through yielding rubber screw
It is connected with shell, and is connected by the non-contact vibration measuring cell signal line of laser with circuit board, realizes signal transmission and power supply.
Wherein, the connection relationship of power supply interface and power supply unit can refer to any existing circuit disclosed in power supply technology and connect
Connect mode.
The embodiment of the present invention at least have the following advantages that or the utility model has the advantages that
The present invention utilizes active noise reduction techniques, by using the non-contact vibration measuring unit of laser, giant magnetostrictive material actuation
The Combination Design of device and high-performance active noise reduction processing unit reaches the system schema of Microsecond grade time delay, when than current industry system
Prolong and be only capable of reaching the technical solution of Millisecond and significantly improve, can effectively widen effective working frequency range of noise eliminator extremely
2000Hz, hence it is evident that reduce outdoor and be transmitted to indoor Middle and low frequency noise magnitude, improve acoustic environment, and then improve quality of the life and work
Make efficiency.Good portability of the present invention is easy installation, easy to operate, does not need to carry out specially constructing i.e. to room can be used, have good
Good environment involvement degree.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is active noise reducing device vertical section structure figure of the invention；
Fig. 2 is active noise reducing device cross section face upwarding assumption diagram of the invention；
Fig. 3 is active noise reducing device realization principle block diagram of the invention；
Fig. 4 is active noise reducing device active noise reduction algorithm principle figure of the invention；
Fig. 5 is active noise reducing device Time Delay of Systems calculating figure of the invention；
Fig. 6 is active noise reducing device spectrum width calculating figure of the invention.
In figure, ontology 11, power switch 22, circuit board 33, vibration generating unit 44, vibration detecting unit 55, fixed list
First 66, vibration source 77,11 top surface glue surface 8 of giant magnetostrictive material actuator mandril, 1 peripheral circular glue surface 9 of ontology, power supply interface
1010, the non-contact vibration measuring cell signal line 12 of giant magnetostrictive material actuator mandril 1111, laser, giant magnetostrictive material are made
Dynamic device signal wire 13.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Each reality of the present invention being usually described and illustrated herein in the accompanying drawings
The component for applying example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the embodiment of the present invention, it should be noted that if occur term " center ", "upper", "lower", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position
Relationship or the invention product using when the orientation or positional relationship usually put, be merely for convenience of the description present invention and
Simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construction
And operation, therefore be not considered as limiting the invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing
Description, is not understood to indicate or imply relative importance.
In addition, being not offered as requiring component abswolute level or outstanding if there are the terms such as term "horizontal", "vertical", " pendency "
It hangs down, but can be slightly tilted.It is not to indicate to be somebody's turn to do if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
Structure is had to fully horizontally, but can be slightly tilted.
In the description of the embodiment of the present invention, " multiple " represent at least two.
In the description of the embodiment of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, if occurring
Term " setting ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to removable
Connection is unloaded, or is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be in
Between medium be indirectly connected, can be the connection inside two elements.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
Embodiment 1
As shown in the picture, a kind of active noise reducing device, comprising: device noumenon 1；For connecting the fixed cell of vibration source 7
6；For detecting the vibration detecting unit 5 of 7 vibration signal of vibration source；For including using active noise reduction algorithm process vibration signal
Generate the active noise reduction processing unit of denoised signal；For generating the vibration for offsetting 7 vibration signal of vibration source according to denoised signal
Generating unit 4；The vibration detecting unit 5 is electrically connected with active noise reduction processing unit；Active noise reduction processing unit and vibration
Generating unit 4 is electrically connected；Active noise reduction processing unit is stated on circuit board 3, the circuit board 3 further includes power supply unit.
The embodiment of the invention is that the vibration detecting unit 5 is the non-contact vibration measuring unit of laser, passes through sending
With the vibration signal for receiving the non-contact acquisition glass of laser, the GP64- processor including integrated optics chip such as Keyemce is partly led
Volumetric laser element, optical lens group, photosensitive element such as CMOS or PSD etc., DSP handles chip etc., or can directly adopt factory in the industry
Family custom mold group, such as Keyemce LK-G5000 series and sincere photosensitive son miniature laser sensing platform, measurement accuracy
Need to meet micron order requirement, range needs to reach grade requirement, time delay need control in Microsecond grade, standard can be exported in time
True glass vibration signal, that is, input noise signal.
The embodiment of the invention is, the active noise reduction processing unit include filter unit, A/D converting unit,
Primary processor, D/A converting unit, noise reduction algorithm unit.Active noise reduction processing unit, active noise reduction processing unit are mainly integrated in
On circuit board 3, comprising filter unit, A/D converting unit, primary processor, D/A converting unit, noise reduction algorithm unit etc., by fast
The active noise reduction algorithm of speed, can produce the vibration that frequency is identical as input noise signal, phase is opposite with input noise signal
Signal.The unit needs extremely strong processing and computing capability, as far as possible reduction system processing delay, generates satisfactory letter
Number, wherein main process task chip can use the dsp processor of the arm processor of STM32 series, TM320 series, can also use
The FPGA of similar Spartan-3 series is as primary processor.
The embodiment of the invention is that active noise reduction algorithm is selected from AP or LMS algorithm, is sketched by taking LMS algorithm as an example
Algorithm implementation principle: by LMS algorithm module based on the noise data after A/D conversion, the noise data d (n) at the n moment is obtained
The x (n) at n moment is obtained as filter based on the glass vibration input noise signal after A/D conversion as noise signal
Input signal, and filter is obtained in the output signal of the output data y (n) as filter at n moment；By output data y (n)
Compared with noise data d (n), error e (n) between the two is obtained；It is corrected by the error e (n) in n moment filter
Weight coefficient w (n), successively iteration, finally makes e (n) progressively reach minimum value；The final output signal for generating filter, as goes
Noise cancellation signal.
Giant magnetostrictive material actuator needs to make using giant magnetostrictive material, to meet system Microsecond grade low time delay
Requirement (about 10 microsecond), the length of giant magnetostrictive material is 20-100mm, diameter 1-5mm.Giant magnetostrictive material is made
The vibration output end of dynamic device is mandril 11, and 11 top surface of mandril is recommended as circle, is more advantageous to transmitting of the noise on glass, is pushing up
Bar top surface is equipped with the strength glue surface 8 of suitable thickness, both needs to eliminate shadow of the pit out-of-flatness to force direction of glass surface
It rings, and needs to guarantee that the glue surface thickness does not generate biggish buffering, reduce the intensity of reversal of vibrations, thickness recommends 0.5mm, surpasses
Magnetostrictive material actuator is fastenedly connected by the glue surface and glass realization, guarantees what giant magnetostrictive material actuator issued
Signal being transmitted in target glass promptly and accurately reduces the vibration level on glass, reaches according to the interference principle of stacking of wave
Noise elimination purpose.Seccotine used can soften excision by way of high-temperature heating, easy to remove.
It is preferred that the length for the giant magnetostrictive material that the giant magnetostrictive material actuator uses is 50mm, diameter is
5mm。
The embodiment of the invention is that the fixed cell 6 is equipped with annular glue surface 9 with 7 contact surface of vibration source.It pastes
Intensity needs to select suitable annular glue surface 9 according to specific, to meet the operation that device can be stable in vibration processes.
The embodiment of the invention is that the circuit board 3 is additionally provided with wireless communication module, the wireless communication module
Including bluetooth or WIFI module.By be equipped with bluetooth, WIFI module again with mobile phone etc. is mobile or desktop system on the software that is arranged
Long-range control is realized in connection, then the function by being arranged on software.Similar long-range control has been used widely, such as intelligence
Energy wrist-watch etc., the application distinguish place therewith and are working condition difference, and corresponding functional software writes difference, but remotely control
Molding formula has reference place.
The embodiment of the invention is that it includes power switch 2, laser warning lamp and fortune that described device ontology 1, which is equipped with,
Row status indicator lamp.By opening power switch 2, the start-up operation of denoising device, laser warning lamp and running LED
Circuit interface connection corresponding with circuit board respectively, passes to laser warning lamp according to corresponding signal and operating status indicates
Lamp, to issue different signal designations.
It is equipped with power supply interface 10 on circuit board 3, provides power supply for whole device.
For device noumenon 1 using giant magnetostrictive material actuator as central axes, giant magnetostrictive material actuator provides screw
Or the form of buckle is mutually fixedly connected with shell, giant magnetostrictive material actuator top layout is welded with active noise reduction unit
Circuit board 3, integrated security low-voltage DC supply unit on circuit board 3 configures additional ac-dc switching power and is powered,
Circuit board 3 is fixed by screws on shell.Giant magnetostrictive material actuator and circuit board 3 are made by giant magnetostrictive material
The dynamic forms such as device signal wire 13 or contact pin connection, realizes signal transmission and power supply.The non-contact vibration measuring unit of laser passes through damping
Rubber screw is connected with shell, and is connected by the non-contact vibration measuring cell signal line 12 of laser with circuit board 3, realizes signal
Transmission and power supply.Wherein, the connection relationship of power supply interface 10 and power supply unit can refer to any existing about power supply technology
Disclosed circuit connecting mode.
Embodiment 2
Active noise reducing device is applied to the noise reduction process of middle low frequency noise, is specifically such as installed on indoor glass, takes out
On the casing of kitchen ventilator etc..
Embodiment 3
Above-mentioned active noise reducing device is placed on vibration source by a kind of active denoising method, open active noise reducing device into
Row noise reduction.
The application principle: whole equipment is equipped with glue surface and vibration source 7 such as glass surface by fixed cell 6 again and realizes closely
Fitting, giant magnetostrictive material actuator are fastened by fixed cell 6 and glass, power supply unit and active noise reduction processing unit collection
On Cheng Yi block circuit board 3, which connect with giant magnetostrictive material actuator and vibration measurement with laser, the non-contact survey of laser
Vibration unit be arranged in giant magnetostrictive material actuator side closer location, not with glass contact.Outside noise is transmitted to glass
On cause glass vibration, the non-contact vibration measuring unit of laser obtains the vibration signal of glass, passes to active noise reduction processing unit, so
Circuit board 3 issues the signal with glass vibration signal special frequency band same frequency but phase phase difference 180 degree afterwards, and the signal is passed
Giant magnetostrictive material actuator is passed, giant magnetostrictive material actuator motivates glass, weakens the vibration on glass, and then drop
It is low to be transmitted to indoor noise magnitude.
Fig. 6, effective frequency range calculate are as follows:
The corresponding wavelength of the frequency of 2000Hz is L=v/f=344/2000=0.172m
1, Waveform composition time delay is 1/8 wavelength, and the permissible delay time only has 62.5 microseconds, and 2 waveforms can balance out
It is most of；
2, Waveform composition is no more than 1/4 wavelength, and corresponding time delay is about 125 microseconds, and wave crest and trough are basic at this time
It will not cut down, there is also new wave crest and trough.
So effective working frequency range within 60 microseconds, just can be extended to 2000Hz by timing_delay estimation.
Herein described technical characteristic can also carry out some simple transformations, as long as can play referring to the shape of drawing illustration
Purpose same as the application, can use for reference the technical solution of this field or similar field.
The present invention does not limit the material of each component, for those skilled in the art, material known in the art can be selected, respectively
Kind of connection relationship can refer to this field or structure is similar or the identical technical solution of purpose, then either refers in the application each
Scheme disclosed in existing literature.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of active noise reducing device characterized by comprising
Device noumenon；
For connecting the fixed cell of vibration source；
For detecting the vibration detecting unit of vibration source vibration signal；
Including handling list for using active noise reduction algorithm process vibration source vibration signal and generating the active noise reduction of denoised signal
Member；
For generating the vibration generating unit for offsetting vibration source vibration signal according to denoised signal；
The vibration detecting unit and active noise reduction processing unit are electrically connected；Active noise reduction processing unit and vibration generating unit
It is electrically connected；
The active noise reduction processing unit is set on circuit board, and the circuit board includes power supply unit.
2. active noise reducing device according to claim 1, it is characterised in that: the vibration detecting unit is that laser is non-contact
Vibration measuring unit, including integrated optics chip, semiconductor Laser device, optical lens group, photosensitive element, DSP handle chip, or straight
It connects using custom mold group.
3. active noise reducing device according to claim 1, it is characterised in that: the active noise reduction processing unit includes filtering
Unit, A/D converting unit, primary processor, D/A converting unit, noise reduction algorithm unit.
4. active noise reducing device according to claim 3, it is characterised in that: the active noise reduction algorithm includes AP or LMS
Algorithm.
5. active noise reducing device according to claim 1, it is characterised in that: the vibration generating unit is ultra-magnetic telescopic
Material actuator, output end are mandril, and ram surface is equipped with glue surface.
6. active noise reducing device according to claim 1, it is characterised in that: the giant magnetostrictive material actuator uses
Giant magnetostrictive material length be 20-100mm, diameter 1-5mm.
7. active noise reducing device according to claim 1, it is characterised in that: described device ontology is equipped with and opens including power supply
Pass, laser warning lamp or running LED.
8. application of the active noise reducing device in the noise reduction process of middle low frequency noise as described in claim 1-7 is any.
9. application according to claim 8, it is characterised in that: the active noise reducing device is mounted on including indoor doors or windows glass
On glass, on the glass of the vehicles.
10. a kind of active denoising method, it is characterised in that: disposed using any active noise reducing device of claim 1-8
Noise reduction is carried out on vibration source.
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| CN201910703541.3A CN110349562A (en) | 2019-07-31 | 2019-07-31 | A kind of active noise reducing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802442A (en) * | 2021-04-15 | 2021-05-14 | 上海鹄恩信息科技有限公司 | Control method of electrostatic field noise reduction glass, electrostatic field noise reduction glass and storage medium |
| CN114333755A (en) * | 2022-03-17 | 2022-04-12 | 滨州学院 | Intelligent monitoring and noise reduction device and method for in-car noise in automobile running |
-
2019
- 2019-07-31 CN CN201910703541.3A patent/CN110349562A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802442A (en) * | 2021-04-15 | 2021-05-14 | 上海鹄恩信息科技有限公司 | Control method of electrostatic field noise reduction glass, electrostatic field noise reduction glass and storage medium |
| CN114333755A (en) * | 2022-03-17 | 2022-04-12 | 滨州学院 | Intelligent monitoring and noise reduction device and method for in-car noise in automobile running |
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