CN107560142A - A kind of active noise reducing device and method suitable for central air-conditioning - Google Patents
A kind of active noise reducing device and method suitable for central air-conditioning Download PDFInfo
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- CN107560142A CN107560142A CN201710968979.5A CN201710968979A CN107560142A CN 107560142 A CN107560142 A CN 107560142A CN 201710968979 A CN201710968979 A CN 201710968979A CN 107560142 A CN107560142 A CN 107560142A
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- loudspeaker
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Abstract
The present invention relates to active noise reduction field, specifically proposes a kind of active noise reducing device and method suitable for central air-conditioning, and the noise of central air-conditioning air outlet is eliminated by the active noise reducing device with noise detection apparatus, noise reduction module and loudspeaker.The active noise reducing device is by generating noise cancellation signal equal with noise signal amplitude, opposite in phase, realize the elimination of noise, it is effectively reduced noise caused by central air-conditioning air outlet, compared with existing passive noise reduction technology, can eliminate passive noise reduction technology be difficult in below the 1000Hz that eliminates, low frequency range noise, the harmful effect that the wind of central air-conditioning is made an uproar to user is reduced, improves the usage experience of central air-conditioning, enhances the competitiveness of product.
Description
Technical field
The present invention relates to active noise reduction techniques field, more particularly to a kind of active noise reduction suitable for central air-conditioning to fill
Put and method.
Background technology
Operationally, air supply duct air outlet can produce larger wind and make an uproar central air-conditioning.The work in noise circumstance for a long time
Work and democratic meeting endanger the physical and mental health of people.Make an uproar problem to solve the wind of central air-conditioning, on the one hand pacify by using in airduct
Install flow deflector during dress additional, consider that the engineering such as the angle of turn at turning means improve wind and made an uproar problem, on the other hand, by
Install silencing apparatus around air channel additional, eliminating part wind using the method for passive noise reduction makes an uproar.
Patent CN105048867A proposes a kind of central air conditioner blast tube noise reduction acoustic-electric reforming unit, and the device passes through detection
The noise frequency range of Relatively centralized in ambient noise, the automatic length for changing heimholtz resonator neck, produces cavity neck
Resonance, and then eliminate airduct noise.This is also a kind of method of passive noise reduction.Mainly it is distributed in view of the noise spectrum of air outlet
It is bad for Middle and low frequency noise noise reduction in below 1000Hz, the method for passive noise reduction.
The content of the invention
Made an uproar to eliminate low frequency wind, the present invention proposes a kind of active noise reducing device suitable for central air-conditioning.By in center
The active noise reducing device is installed, you can the low frequency wind for effectively eliminating below 1000Hz is made an uproar on air conditioning exhausting pipeline.
In a first aspect, the embodiments of the invention provide a kind of active noise reducing device suitable for central air-conditioning, including：It is described
Detection means is installed on the inside of central air conditioner blast tube with loudspeaker, and the noise reduction module is installed on the outside of ajutage.
The noise detection apparatus is connected with the noise reduction module, and the noise reduction module is connected with the loudspeaker.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the first of first aspect, wherein, institute
State detection means and number of loudspeakers is no less than 1.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the third of first aspect, wherein, institute
State corresponding 1 loudspeaker of 1 detection means.
1 detection means is installed in the same horizontal line with 1 loudspeaker.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 4th of first aspect kind, wherein, institute
State multiple detection means and correspond to multiple loudspeakers, and the detection means is identical with the number of loudspeakers.
The multiple detection means is evenly distributed on a certain longitudinal section of air-supply inside pipe wall, and the multiple detection means is equal
It is even to be distributed on another longitudinal section of air-supply inside pipe wall.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 5th of first aspect kind, wherein, institute
Longitudinal section where stating detection means is close to longitudinal section where longitudinal section position where the loudspeaker, the loudspeaker close to air-supply
The position of pipe outlet.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 6th of first aspect kind, wherein, institute
Stating noise reduction module includes Dolby circuit and power supply.
The Dolby circuit is connected with the power supply, and the power supply is powered to the Dolby circuit.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 7th of first aspect kind, wherein, institute
Stating Dolby circuit includes：The analog to digital conversion circuit being sequentially connected, filter circuit and D/A converting circuit.
Analog-digital conversion circuit as described is also connected with the detection means, for entering to the noise signal that detection means collects
Row analog-to-digital conversion, and give the noise signal transmission after analog-to-digital conversion to the filter circuit；
The filter circuit, for carrying out noise reduction process to the noise signal after analog-to-digital conversion, noise cancellation signal is obtained, and will
Gained noise cancellation signal is transferred to the D/A converting circuit；
The D/A converting circuit, also it is connected with the loudspeaker, for carrying out digital-to-analogue conversion to the noise cancellation signal, and
Noise cancellation signal after digital-to-analogue conversion is transferred to the loudspeaker.
The D/A converting circuit is also connected with the loudspeaker.
Second aspect, the embodiment of the present invention provides a kind of active denoising method suitable for central air-conditioning, for design
The Dolby circuit stated, including：
Establish the electric transmission function of loudspeaker in denoising device；
Based on loudspeaker transmission function design of feedback wave filter；
According to loudspeaker and the number of detection means, the feedback filter of respective numbers is designed.
With reference to second aspect, the embodiments of the invention provide the possible embodiment of the first of second aspect, wherein：Build
The electric transmission function of loudspeaker in vertical denoising device, including：
To the loudspeaker input electrical signal；
Obtain the loudspeaker output electric signal；
According to described input electrical signal and described output electric signal, by described in the foundation of least square class discrimination method
The electric transmission function of loudspeaker.
With reference to second aspect, the embodiments of the invention provide the possible embodiment of second of second aspect, wherein：Base
In loudspeaker transmission function design of feedback wave filter, including：
Assuming that feedback filter transmission function is H, loudspeaker transmission function is G；
The design of feedback filter is attributed to and solves an optimization problem：
Solve feedback filter transfer function H so thatI.e.：Under conditions of system is stable, makeTwo Norm minimums.
This practicality newly proposes a kind of active noise reducing device suitable for central air-conditioning, by with noise detection apparatus, drop
The active noise reducing device of module of making an uproar and loudspeaker eliminates the noise of central air-conditioning air outlet.The active noise reducing device passes through generation
Equal with noise signal amplitude, opposite in phase noise cancellation signal, realizes the elimination of noise, is effectively reduced central air-conditioning air-out
Noise caused by mouthful, compared with existing passive noise reduction technology, below the 1000Hz that passive noise reduction technology is difficult to eliminate can be eliminated
In, low frequency range noise, and reach certain noise reduction depth；When noise frequency distribution character changes, according to the noise
Frequency characteristic redesign noise reduction filtering circuit, control the center frequency point of noise reduction, at utmost eliminate pipeline wind and make an uproar, it is effectively real
The wind of low-frequency range is made an uproar elimination in existing, is reduced the harmful effect that the wind of central air-conditioning is made an uproar to user, is improved central air-conditioning
Usage experience, enhance the competitiveness of product.
Brief description of the drawings
Below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows that the embodiment of the present invention provides a kind of structural representation of the active noise reducing device suitable for central air-conditioning
Figure；
Fig. 2 shows that the embodiment of the present invention provides a kind of 1 detection of active noise reducing device suitable for central air-conditioning
The corresponding 1 loudspeaker placement location schematic diagram of device；
Fig. 3 shows that the embodiment of the present invention provides a kind of multiple detections of the active noise reducing device suitable for central air-conditioning
Device corresponds to multiple loudspeaker placement location schematic diagrames；
Fig. 4 shows that the embodiment of the present invention provides a kind of noise reduction module of the active noise reducing device suitable for central air-conditioning
Each part composition structural representation；
Fig. 5 shows that the embodiment of the present invention provides a kind of flow chart of the active denoising method suitable for central air-conditioning；
Fig. 6-8 shows that the embodiment of the present invention provides a kind of noise reduction effect of active denoising method suitable for central air-conditioning
Fruit is schemed.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the feature in embodiments herein and embodiment can be mutually combined.
With reference to specific embodiment the present invention will be further explained explanation.
Currently, to solve the noise problem of central air-conditioning, on the one hand using flow deflector is installed additional in airduct installation process, examine
Consider the engineering means such as angle of turn at turning and improve wind and make an uproar problem, on the other hand, by installing silencing apparatus additional around air channel,
Part wind is eliminated using the method for passive noise reduction to make an uproar.Because noise spectrum is mainly distributed on below 1000Hz, the side of passive noise reduction
Method is bad for Middle and low frequency noise noise reduction.Based on this, the application provides a kind of active noise reduction suitable for central air-conditioning and filled
Put.
It should be noted that in the description of the invention, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
In addition, in the description of the invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " company
Connect " it should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or it is integrally connected；It can be machine
Tool connects or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be two members
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
Concrete meaning.
Embodiment 1
The structural representation of active noise reducing device shown in Figure 1, the present embodiment propose that one kind is applied to central air-conditioning
Active noise reducing device, including detection means 1, loudspeaker 2 and noise reduction module 3.
Above-mentioned detection device 1 is installed on the inside of central air conditioner blast tube with above-mentioned loudspeaker 2, and above-mentioned noise reduction module 3 is installed
On the outside of ajutage.
Above-mentioned detection device 1 is connected with above-mentioned noise reduction module 3, and above-mentioned noise reduction module 3 is connected with above-mentioned loudspeaker 2.
Above-mentioned detection device 1, it is in charge of interior noise signal for gathering to send, and the noise signal collected transmission is supreme
State noise reduction module 3.
The complexity realized according to noise reduction and denoising device, noise detection apparatus can be one or more, raise
Sound device can also be one or more.
In one embodiment, corresponding 1 loudspeaker of 1 detection means of active noise reducing device as shown in Figure 2 is put
Seated position schematic diagram, wherein star represent noise detection apparatus, triangular representation loudspeaker, in the denoising device, 1 noise inspection
Survey corresponding 1 detection means of device.To ensure noise reduction, detection means and the same water of loudspeaker installation air supply duct inwall
On horizontal line.Detection means is arranged close to the position of loudspeaker, and loudspeaker is arranged close to ajutage exit.Detection means exists
The noise signal not being eliminated is detected in noise reduction process.
In one embodiment, multiple detection means as shown in Figure 3 correspond to multiple loudspeaker placement location schematic diagrames,
Wherein star represents noise detection apparatus, triangular representation loudspeaker, and multiple detection means correspond to multiple loudspeakers, and detect dress
The number that number is equal to loudspeaker is put, i.e., each detection means has 1 loudspeaker corresponding.Each detection means is in noise reduction
During to its corresponding loudspeaker, nearby the noise signal that is not eliminated detects.Multiple detection means are installed and multiple raised
Sound device more accurately detection noise and can improve de-noising performance.
Above-mentioned multiple detection means are evenly distributed on a certain longitudinal section of air-supply inside pipe wall, and above-mentioned multiple loudspeakers are uniform
It is distributed on another longitudinal section of air-supply inside pipe wall.
Longitudinal section where above-mentioned detection device is vertical where longitudinal section position where the loudspeaker, above-mentioned loudspeaker to be cut
Face is close to the position that ajutage exports.Ensure that the relative position of every set detecting device and loudspeaker is all identical, be advantageous to noise reduction electricity
The design on road.
In one embodiment, active noise reducing device has 2 detection means and 2 loudspeakers.
Noise reduction module shown in Figure 4 respectively partly forms structural representation, and the present embodiment also proposes a kind of noise reduction module,
Apply in above-mentioned denoising device, the noise reduction module includes：The noise reduction module 3 includes Dolby circuit 31 and supplying cell 32 two
Part, Dolby circuit are connected with power supply, and power supply is powered to Dolby circuit.
Above-mentioned Dolby circuit 31 includes：The analog to digital conversion circuit 311 being sequentially connected, filter circuit 312 and digital-to-analogue conversion
Circuit 313.
Above-mentioned analog to digital conversion circuit 311, is also connected with each noise detection apparatus, is made an uproar for what is gathered to noise detection apparatus
Acoustical signal carries out analog-to-digital conversion, and gives the digital data transmission after conversion to above-mentioned filter circuit 312.
Above-mentioned filter circuit 312, for handling the noise signal after analog-to-digital conversion, noise cancellation signal is obtained, and will
Noise cancellation signal obtained above is transmitted to above-mentioned D/A converting circuit 313.
Above-mentioned D/A converting circuit 313, also it is connected with loudspeaker, for carrying out digital-to-analogue conversion to above-mentioned noise cancellation signal, and
Noise cancellation signal after digital-to-analogue conversion is transmitted to above-mentioned loudspeaker.
Analog to digital conversion circuit 311, filter circuit 312 and D/A converting circuit 313 can be respectively adopted existing any
Analog-to-digital conversion, filtering and the chip of digital-to-analogue conversion or integrated circuit can be realized, is no longer repeated one by one here.
Embodiment 2
The present embodiment proposes a kind of active denoising method suitable for central air-conditioning, is proposed for designing above-described embodiment 1
Dolby circuit.
A kind of flow chart of active denoising method suitable for central air-conditioning shown in Figure 5, what the present embodiment proposed
Active denoising method comprises the following steps：
Step 501, the electric transmission function for establishing loudspeaker in denoising device；
Step 503, based on loudspeaker transmission function design of feedback wave filter；
Step 505, the number according to loudspeaker and detection means, design the feedback filter of respective numbers.
Above-mentioned each detection means corresponds to said one loudspeaker, the electric transmission letter design based on above-mentioned each loudspeaker
The quantity of corresponding feedback filter, i.e. feedback filter is identical with the number of loudspeaker.
Specifically, above-mentioned steps 503 comprise the following steps (1) to step (3)：
(1) to the loudspeaker input electrical signal；
(2) the loudspeaker output electric signal is obtained；
(3) according to described input electrical signal and described output electric signal, established by least square class discrimination method
The electric transmission function of the loudspeaker.
Above-mentioned steps 505 comprise the following steps (1) to step (3)：
(1) assume that feedback filter transmission function is H, loudspeaker transmission function is G；
(2) design of feedback filter is attributed to and solves an optimization problem：
(3) feedback filter transfer function H is solved so thatI.e.：Under conditions of system is stable, makeTwo Norm minimums.
Implement 3
1 detection means and 1 loudspeaker, 2 detection means and 2 loudspeakers, 4 detection means and 4 are respectively adopted
Individual loudspeaker, and the wind of the air outlet of central air-conditioning is made an uproar using the active denoising method in embodiment 2 and carries out active noise reduction, its
Noise reduction is referring to Fig. 6 to Fig. 8.Wherein, ordinate represents the decibel value of noise, and abscissa represents frequency range where noise.It is vertical to sit
Scale value is less than 0dB and represents that noise amplitude reduces, that is, indicates noise reduction.
In this example, for using 1 detection means and 1 loudspeaker, its noise reduction is as shown in fig. 6, its noise reduction
Frequency range is mainly distributed between 20Hz~400Hz, maximum noise reduction depth about 20dB.For being raised one's voice using 2 detection means and 2
Device, its noise reduction is as shown in fig. 7, its noise reduction frequency range is mainly distributed between 50Hz~700Hz, and maximum noise reduction depth is about
15dB.For using 4 detection means and 4 loudspeakers, its noise reduction is as shown in figure 8, its noise reduction frequency range is mainly distributed on
Between 20Hz~700Hz, maximum noise reduction depth about 20dB.Contribute to improve noise reduction effect using multiple detection means and loudspeaker
Fruit, the noise reduction frequency range and noise reduction depth feedback filter parameters of noise reduction system select relevant, different feedback filter parameters, phase
The noise reduction frequency range for the noise reduction system answered is different with maximum noise reduction depth.Noise reduction frequency range and maximum noise reduction depth mutually restrict,
Should it is determined that noise reduction frequency range in, seek at centre frequency maximum noise reduction depth.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, either they are fabricated to respectively each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific
Hardware and software combines.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other implementations
Included some features rather than further feature in example, but the combination of the feature of different embodiments means in the present invention
Within the scope of and form different embodiments.For example, in superincumbent claims, embodiment claimed
It is one of any mode to use in any combination.The information for being disclosed in the background section is merely intended to intensification pair
The understanding of the general background technology of the present invention, and it has been this to be not construed as recognizing or imply the information structure in any form
Prior art well known to art personnel.
Claims (10)
- A kind of 1. active noise reducing device suitable for central air-conditioning, it is characterised in that：Including detection means, noise reduction module and raise Sound device；The detection means is installed on the inside of central air conditioner blast tube with loudspeaker, and the noise reduction module is installed on outside ajutage Side；The noise detection apparatus is connected with the noise reduction module, and the noise reduction module is connected with the loudspeaker.
- A kind of 2. active noise reducing device suitable for central air-conditioning according to claim 1, it is characterised in that the detection Device and number of loudspeakers are no less than 1.
- 3. a kind of active noise reducing device suitable for central air-conditioning according to claim 1, it is characterised in that described 1 Corresponding 1 loudspeaker of detection means；1 detection means states loudspeaker installation in the same horizontal line for 1 with institute.
- 4. a kind of active noise reducing device suitable for central air-conditioning according to claim 1, it is characterised in that the multiple Detection means corresponds to multiple loudspeakers, and the detection means is identical with the number of loudspeakers；The multiple detection means is evenly distributed on a certain longitudinal section of air-supply inside pipe wall, and the multiple detection means is uniformly divided Cloth is on another longitudinal section of air-supply inside pipe wall.
- A kind of 5. active noise reducing device suitable for central air-conditioning according to claim 1, it is characterised in that the detection Longitudinal section where device is close to longitudinal section position where loudspeaker, and longitudinal section where loudspeaker is close to the position that ajutage exports Put.
- A kind of 6. active noise reducing device suitable for central air-conditioning according to claim 1, it is characterised in that the noise reduction Module includes Dolby circuit and power supply；The Dolby circuit is connected with the power supply, and the power supply is powered to the Dolby circuit.
- A kind of 7. active noise reducing device suitable for central air-conditioning according to claim 6, it is characterised in that the noise reduction Circuit includes：The analog to digital conversion circuit being sequentially connected, filter circuit and D/A converting circuit；Analog-digital conversion circuit as described is also connected with the detection means, and the noise signal for being collected to detection means carries out mould Number conversion, and give the noise signal transmission after analog-to-digital conversion to the filter circuit；The filter circuit, for carrying out noise reduction process to the noise signal after analog-to-digital conversion, obtain noise cancellation signal, and by gained Noise cancellation signal is transferred to the D/A converting circuit；The D/A converting circuit, also it is connected with the loudspeaker, for carrying out digital-to-analogue conversion to the noise cancellation signal, and by number Noise cancellation signal after mould conversion is transferred to the loudspeaker；The D/A converting circuit is also connected with the loudspeaker.
- 8. a kind of active denoising method suitable for central air-conditioning, for designing the Dolby circuit described in the claims 7, its It is characterised by, including：Establish the electric transmission function of loudspeaker in denoising device；Based on loudspeaker transmission function design of feedback wave filter；According to loudspeaker and the number of detection means, the feedback filter of respective numbers is designed.
- 9. a kind of active denoising method suitable for central air-conditioning according to claim 8, it is characterised in that establish noise reduction The electric transmission function of loudspeaker in device, including：To the loudspeaker input electrical signal；Obtain the loudspeaker output electric signal；According to described input electrical signal and described output electric signal, by being raised one's voice described in the foundation of least square class discrimination method The electric transmission function of device.
- 10. a kind of active denoising method suitable for central air-conditioning according to claim 8, it is characterised in that based on raising Sound device transmission function design of feedback wave filter, including：Assuming that feedback filter transmission function is H, loudspeaker transmission function is G；The design of feedback filter is attributed to and solves an optimization problem：Solve feedback filter transfer function H so thatI.e.：Under conditions of system is stable, make's Two Norm minimums.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109282479A (en) * | 2018-09-17 | 2019-01-29 | 青岛海信日立空调系统有限公司 | Air conditioner noise reduction device and noise-reduction method |
| CN111536681A (en) * | 2020-04-24 | 2020-08-14 | 青岛海信日立空调系统有限公司 | Air conditioner and active noise reduction debugging method |
| CN111765619A (en) * | 2020-07-03 | 2020-10-13 | 深圳市旷世伟业工程有限公司 | Central air conditioner noise reduction structure and method thereof |
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Application publication date: 20180109 |