CN108847209A - A kind of denoising device and noise-reduction method - Google Patents
A kind of denoising device and noise-reduction method Download PDFInfo
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- CN108847209A CN108847209A CN201810555317.XA CN201810555317A CN108847209A CN 108847209 A CN108847209 A CN 108847209A CN 201810555317 A CN201810555317 A CN 201810555317A CN 108847209 A CN108847209 A CN 108847209A
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- G—PHYSICS
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- 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
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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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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Abstract
The present invention proposes a kind of denoising device and noise-reduction method, is related to noise reduction field, which includes：Vibration detection device, controller and vibration excitor；Vibration detection device is connect with controller；Controller is connect with vibration excitor；Vibration detection device is configured as the first vibration signal of detection vibrating object；Controller is configured as receiving the first vibration signal, and generates control signal according to the first vibration signal；Vibration excitor is configured as receiving control signal, and generates the second vibration signal.Compared with existing active noise reduction techniques eliminate the method for noise using the de-noising sound wave that secondary sound source issues, denoising device proposed by the present invention can the vibration that causes in communication process of vibration to noise source itself or noise control, pass through the vibration during reduction noise transmission, eliminate the low-frequency noise in space, and the system structure is simple, it is easy to implement.
Description
Technical field
The present invention relates to noise reduction technology fields, more particularly, to a kind of denoising device and noise-reduction method.
Background technique
Active noise reduction earphone carries out denoising for the intracorporal ambient noise of earphone chamber is transmitted to, and ambient noise passes through control
Noise cancellation signal is generated after circuit processed, noise cancellation signal is played by loudspeaker generates de-noising sound wave, and de-noising sound wave and noise sound wave produce
Raw interference realizes that the noise by active noise reduction headset user ear is eliminated, this is that one kind is made an uproar for certain point in small enclosure space
The active noise reduction techniques that sound is eliminated.To realize the whole noise reduction of larger enclosure space using active noise reduction techniques, using single
Secondary sound source obviously cannot achieve the noise reduction in entire space, and using the method for multiple secondary sound sources, due to multiple de-noising sound waves
Between can interfere, cause the difficulty of filter circuit design very huge, noise reduction effect is difficult to ensure.
In response to the above problems, medium-high frequency can be eliminated by increasing the passive noise-reduction method of sound-absorbing material within the enclosed space
The noise of section, and to the noise of low-frequency range, then the method for not being available passive noise reduction reaches preferable anti-acoustic capability.
Summary of the invention
To solve the above problems, the present invention proposes a kind of denoising device and noise-reduction method, to solve above-mentioned big enclosure space
Low-frequency noise problem.
In a first aspect, the present invention proposes a kind of denoising device, including vibration detection device, controller and vibration excitor；Institute
Vibration detection device is stated to connect with the controller；The controller is connect with the vibration excitor；The vibration detection device quilt
It is configured to detect the first vibration signal of the vibrating object；The controller is configured as receiving first vibration signal,
And control signal is generated according to first vibration signal；The vibration excitor is configured as receiving the control signal, and generates
Second vibration signal.
Further, the controller includes sequentially connected amplifying circuit, analog to digital conversion circuit, control circuit and number
Analog conversion circuit.
Further, the control circuit includes feedback control circuit.
Further, the vibration detection device is arranged close to the vibration excitor, is connect with shortening the vibration detection device
The first moment and the vibration excitor for receiving first vibration signal issued between the second moment of second vibration signal
Time interval.
Further, the vibration detection device is identical as the quantity of the vibration excitor.
Second aspect, the present invention propose a kind of noise-reduction method, applied to the noise reduction dress as described in first aspect any one
It sets, the method includes：
First vibration signal of the vibration detection device detection vibrating object, is sent to institute for first vibration signal
State controller；
The controller receives first vibration signal, generates the control signal for eliminating first vibration signal；
The vibration excitor receives the control signal, and generates the second vibration signal.
Further, the controller includes feedback control circuit, and the controller, which generates, eliminates the first vibration letter
Number control signal the step of include：
Input signal and output signal based on the vibration excitor obtain the vibration of the vibration excitor using least square method
Characteristic transmission function expression formula G (s), wherein s indicates differential operator；
Based on the vibration characteristics transmission function expression formula G (s) of the vibration excitor, the feedback control circuit is designed；
The feedback control circuit receives first vibration signal, generates the control letter for eliminating first vibration signal
Number.
Further, the vibration characteristics transmission function expression formula G (s) based on the vibration excitor is designed described anti-
Presenting control circuit includes：
It obtains so that (the 1-G (s) × H of ‖ 1/FB(s))‖2The smallest H of valueFB(s), wherein HFB(s) feedback control electricity is indicated
The transmission function expression formula on road；
Will be described so that (the 1-G (s) × H of ‖ 1/FB(s))‖2The smallest H of valueFB(s) most as the feedback control circuit
Excellent transmission function expression formula；
Optimal transmission function expression formula based on the feedback control circuit, designs the feedback control circuit.
The present invention proposes a kind of denoising device and noise-reduction method, the denoising device include：Vibration detection device, controller with
And vibration excitor；Vibration detection device is connect with controller；Controller is connect with vibration excitor；Vibration detection device is configured as detecting
First vibration signal of vibrating object；Controller is configured as receiving the first vibration signal, and is generated according to the first vibration signal
Control signal；Vibration excitor is configured as receiving control signal, and generates the second vibration signal.With existing active noise reduction techniques benefit
The method that the de-noising sound wave issued with secondary sound source eliminates noise is compared, and denoising device proposed by the present invention can be to initiation noise
Vibration or the vibration that causes in communication process of noise controlled, pass through the vibration reduced during noise transmission, eliminate
Low-frequency noise in space, and the system structure is simple, it is easy to implement.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 shows a kind of denoising device structural schematic diagram provided in the embodiment of the present invention 1；
Fig. 2 shows a kind of noise-reduction method flow charts provided in the embodiment of the present invention 2；
Fig. 3 shows the feedback control structure schematic diagram provided in the embodiment of the present invention 2.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance.Unless otherwise clearly defined and limited, term " connection ", " connected " should do broad sense
Understand, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connection, it can also
To be electrical connection；It can be directly connected, the company inside two elements can also be can be indirectly connected through an intermediary
It is logical.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment 1
Denoising device structural schematic diagram as shown in Figure 1, the present invention propose a kind of denoising device, including vibration detection device
100, controller 200 and vibration excitor 300.Vibration detection device 100 is connect with controller 200, controller 200 and vibration excitor
300 connections.
Vibration detection device 100 is used to detect the first vibration signal of vibrating object, converts electricity for the first vibration signal
Signal, and by the electric signal transmission to controller 200.
Controller 200 is used to be based on the electric signal according to the electric signal from vibration detection device 100, generates control letter
Number and export to vibration excitor 300.
Vibration excitor 300 is used to receive the control signal of the output of controller 200, and according to the control signal, generates the second vibration
Dynamic signal.
Above-mentioned vibration detection device 100 is detected by the detection to the first vibration signal for causing noise based on this
First vibration signal, the control signal generated using controller 200 control vibration excitor 300 as the input signal of vibration excitor 300
The second vibration signal is exported, the first vibration signal for causing noise is eliminated using the second vibration signal that vibration excitor 300 exports, is reached
The purpose eliminated to noise.
In one embodiment, controller 200 includes sequentially connected amplifying circuit, analog to digital conversion circuit, control electricity
Road and D/A converting circuit.Electric signal from vibration detection device 100 into cross amplifier amplify processing after export to
Analog to digital conversion circuit, output is to control circuit after analog to digital conversion circuit converts analog signals into digital signal, through control circuit
Output digital controlled signal is calculated afterwards, which exports simulation control electric signal after D/A converting circuit is converted
(i.e. control signal), simulation control electric signal transmission to vibration excitor 300, the input signal as vibration excitor 300.
In one embodiment, above-mentioned control circuit includes feedback control circuit.Vibration detection device 100 and vibration excitor
It should be installed according to the topological structure of feedback.
In one embodiment, vibration detection device 100 is arranged close to vibration excitor 300, to shorten vibration detection device
100 receive the first moment of the first vibration signal and vibration excitor 300 issue between the second moment of the second vibration signal when
Between be spaced.To improve the second vibration signal to the eradicating efficacy of the first vibration signal, the second vibration signal and the first vibration should be reduced
Time delay between dynamic signal.Ideally, vibration detection device 100 and the vibration excitor 300 as execution control signal
In same physical location, this cannot achieve in practical applications, therefore, in use by vibration detection device
100 and vibration excitor 300 install position as close to by the delay time between the second vibration signal and the first vibration signal
Control guarantees the second vibration signal to the effectiveness in vibration suppression of the first vibration signal in a shorter time range.
In one embodiment, vibration detection device 100 is identical as the quantity of vibration excitor 300.Vibration is determined by measurement
The master mode of dynamic control object, if they are mounted on master by one vibration detection device 100 of installation and a vibration excitor 300
Mode center；If installing multiple vibration detection devices 100 and multiple vibration excitors 300, vibration detection device 100 and vibration excitor
300 be one-to-one relationship, and vibration detection device 100 and vibration excitor 300 are complete installations, if master mode region is in
For straight line shape, then more set vibration detection devices 100 and vibration excitor 300 are evenly distributed on above-mentioned straight line.It shakes with 1
The denoising device of motion detection device 100 and 1 vibration excitor 300, the design of controller is simple, but effectiveness in vibration suppression is limited, noise reduction effect
Fruit is also restrained；Denoising device with multiple vibration detection devices 100 and multiple vibration excitors 300, in design controller 200
When need to consider the effect of intercoupling between multiple vibration excitors, the design process of controller 200 is complicated, but effectiveness in vibration suppression increases
By force, noise reduction effect is also promoted.
In one embodiment, the room closed to one, with glass window using above-mentioned denoising device carries out
Noise reduction.Vibration detection device 100 and vibration excitor 300 are installed the main mould of windowpane by the master mode that windowpane is determined by measuring
The center of state, the master mode for causing glass when noise is propagated by glass change, and glass is shaken with a certain frequency
It is dynamic, to generate the sound of a certain frequency.Vibration detection device 100 detects the first vibration letter caused by the variation of glass master mode
Number, the first vibration signal is transmitted to controller 200 after vibration detection device 100 is converted to electric signal, after controller 200 calculates
Vibration excitor 300 is output control signals to, vibration excitor 300 generates the second vibration signal, and the vibration and noise that vibration excitor generates causes
Glass vibration interaction, reduce the oscillating region of glass, to weaken noise.
Embodiment 2
Noise-reduction method flow chart of steps as shown in Figure 2, the present invention propose a kind of noise-reduction method, applied to implement 1 in mention
Denoising device out, includes the following steps：
S10：Vibration detection device 100 detects the first vibration signal of vibrating object, and the first vibration signal is sent to control
Device 200 processed；
S20：Controller 200 receives the first vibration signal, generates the control signal for eliminating the first vibration signal；
S30：Vibration excitor 300 receives control signal, and generates the second vibration signal.
By the detection of the vibration to the current object for causing noise, control signal, control letter are generated using controller
The output of number control vibration excitor can reduce the weakening signal of object vibration, reach and reduce vibrating object Oscillation Amplitude and vibration area
Effect, realize the elimination of noise.
In step S20, controller 200 includes feedback control circuit, is included the following steps：
S201：Input signal and output signal based on vibration excitor, the vibration for obtaining vibration excitor using least square method are special
Property transmission function expression formula G (s), wherein s indicate differential operator；
S202：Vibration characteristics transmission function expression formula G (s) based on vibration excitor designs the feedback control circuit；
S203：Feedback control circuit receives the first vibration signal, generates the control signal for eliminating the first vibration signal.
Assuming that the input signal and output signal of vibration excitor are respectively u (t), y (t), wherein t indicates the moment, vibration excitor
Vibration characteristics transmission function expression formulaWherein, B (s) and F (s) points
Not Biao Shi transmission function expression formula molecule multinomial and denominator polynomials, nb, nf respectively indicate the rank of molecule, denominator polynomials
It is secondary, b1, b2...bnb, f1, f2...fnfIndicate the coefficient of molecule, denominator polynomials.Based on u (t), y (t), using least square method
Determine nb, nf, b in G (s) expression formula1, b2...bnb, f1, f2...fnfValue.
In a possible embodiment, the design of feedback control circuit can be attributed to the solution of following problem：‖1/(1-G
(s)×HFB(s))‖2, so that the smallest H of above formula valueFB(s) be feedback control circuit optimal transmission function expression formula.It is based on
This, above-mentioned steps S202 includes：
S2021：It obtains so that (the 1-G (s) × H of ‖ 1/FB(s))‖2The smallest H of valueFB(s), wherein HFB(s) feedback is indicated
The transmission function expression formula of control circuit；
S2022：It will be so that (the 1-G (s) × H of ‖ 1/FB(s))‖2The smallest H of valueFB(s) as the optimal of feedback control circuit
Transmission function expression formula；
S2023：Optimal transmission function expression formula based on feedback control circuit, design of feedback control circuit.
Feedback control structure figure as shown in Figure 3, v1, v2 respectively indicate the first vibration signal and the second vibration signal, v1
The vibration signal currently not yet eliminated with the sum of v2 expression.H and G respectively indicate feedback control circuit transmission function expression formula and
The vibration characteristics expression formula of vibration excitor.
Starting stage, input of the first vibration signal v1 as feedback control circuit, after feedback control circuit acts on
Output control signal, controls input of the signal as vibration excitor, exports the second vibration signal v2 after vibration excitor acts on, and second
Vibration signal v2 and the first vibration signal v1 sums, and the vibration signal after summation is used as the input of feedback control circuit again, so
It repeats the above process, final to realize, the sum of the second vibration signal v2 and the first vibration signal v1 are minimum.It is fed back by rationally designing
Control circuit passes through the second vibration signal v2 maximum journey so that the sum of the first vibration signal v1 and the second vibration signal v2 are minimum
Degree reduces the first vibration signal v1, realizes the elimination of noise.
The present invention proposes a kind of denoising device and noise-reduction method, utilizes secondary sound source to issue with existing active noise reduction techniques
The de-noising sound wave method of eliminating noise compare, denoising device proposed by the present invention vibration to noise source itself or can make an uproar
The vibration that sound causes in communication process is controlled, and by the vibration during reduction noise transmission, is eliminated low in space
Frequency noise, and the system structure is simple, it is easy to implement.
The technical effect and aforementioned device embodiment phase of method provided by the embodiment of the present invention, realization principle and generation
Together, to briefly describe, Installation practice part does not refer to place, can refer to corresponding contents in preceding method embodiment.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustratively, without
It is as limitation, therefore, other examples of exemplary embodiment can have different values.
It should 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.
The flow chart and block diagram in the drawings show the device of multiple embodiments according to the present invention, method and computer journeys
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part of one module, section or code of table, a part of the module, section or code include one or more use
The executable instruction of the logic function as defined in realizing.It should also be noted that in some implementations as replacements, being marked in box
The function of note can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can actually base
Originally it is performed in parallel, they can also be executed in the opposite order sometimes, and this depends on the function involved.It is also noted that
It is the combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart, can uses and execute rule
The dedicated hardware based system of fixed function or movement is realized, or can use the group of specialized hardware and computer instruction
It closes to realize.
Claims (8)
1. a kind of denoising device, which is characterized in that including vibration detection device, controller and vibration excitor；
The vibration detection device is connect with the controller；The controller is connect with the vibration excitor；
The vibration detection device is configured as the first vibration signal of detection vibrating object；
The controller is configured as receiving first vibration signal, and generates control letter according to first vibration signal
Number；
The vibration excitor is configured as receiving the control signal, and generates the second vibration signal.
2. denoising device according to claim 1, which is characterized in that the controller includes sequentially connected amplification electricity
Road, analog to digital conversion circuit, control circuit and D/A converting circuit.
3. denoising device according to claim 2, which is characterized in that the control circuit includes feedback control circuit.
4. denoising device according to claim 1, which is characterized in that the vibration detection device is set close to the vibration excitor
It sets, is received described in the first moment and the vibration excitor sending of first vibration signal with shortening the vibration detection device
Time interval between second moment of the second vibration signal.
5. denoising device according to claim 1, which is characterized in that the number of the vibration detection device and the vibration excitor
It measures identical.
6. a kind of noise-reduction method, applied to the denoising device as described in claim 1 to 5 any one, which is characterized in that packet
It includes：
First vibration signal of the vibration detection device detection vibrating object, is sent to the control for first vibration signal
Device processed；
The controller receives first vibration signal, generates the control signal for eliminating first vibration signal；
The vibration excitor receives the control signal, and generates the second vibration signal.
7. noise-reduction method according to claim 6, which is characterized in that the controller includes feedback control circuit, described
Controller generates the step of control signal for eliminating first vibration signal and includes：
Input signal and output signal based on the vibration excitor obtain the vibration characteristics of the vibration excitor using least square method
Transmission function expression formula G (s), wherein s indicates differential operator；
Based on the vibration characteristics transmission function expression formula G (s) of the vibration excitor, the feedback control circuit is designed；
The feedback control circuit receives first vibration signal, generates the control signal for eliminating first vibration signal.
8. noise-reduction method according to claim 7, which is characterized in that the vibration characteristics based on the vibration excitor passes
Delivery function expression formula G (s), designing the feedback control circuit includes：
It obtains so that (the 1-G (s) × H of ‖ 1/FB(s))‖2The smallest H of valueFB(s), wherein HFB(s) feedback control circuit is indicated
Transmission function expression formula；
Will be described so that (the 1-G (s) × H of ‖ 1/FB(s))‖2The smallest H of valueFB(s) as the optimal biography of the feedback control circuit
Delivery function expression formula；
Optimal transmission function expression formula based on the feedback control circuit, designs the feedback control circuit.
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| CN201810555317.XA CN108847209A (en) | 2018-06-01 | 2018-06-01 | A kind of denoising device and noise-reduction method |
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| CN113316815A (en) * | 2019-01-11 | 2021-08-27 | 青岛海尔电冰箱有限公司 | Consumer appliance with one or more noise cancellation features |
| CN113676804A (en) * | 2020-05-14 | 2021-11-19 | 华为技术有限公司 | Active noise reduction method and device |
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Application publication date: 20181120 |