CN103021399B - A kind of sound arrester and electronic equipment - Google Patents
A kind of sound arrester and electronic equipment Download PDFInfo
- Publication number
- CN103021399B CN103021399B CN201210475736.5A CN201210475736A CN103021399B CN 103021399 B CN103021399 B CN 103021399B CN 201210475736 A CN201210475736 A CN 201210475736A CN 103021399 B CN103021399 B CN 103021399B
- Authority
- CN
- China
- Prior art keywords
- pipeline
- equipment
- microphone
- sound arrester
- noise reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a kind of sound arrester and electronic equipment, belong to electronic applications.Sound arrester cover is contained in device external, equipment is provided with air inlet and air outlet, sound arrester comprises: shell, pipeline and active noise reduction assembly, jacket is contained in device external, shell is provided with import and outlet, all connected by pipeline between import and air inlet, between air outlet and outlet, in every bar pipeline, be provided with active noise reduction assembly.Electronic equipment comprises sound arrester and equipment, and sound arrester cover is contained in device external.The embodiment of the present invention directly covers the outside of the equipment of being contained in by shell, the high-frequency noises of prevention equipment is directly to external radiation, high-frequency noises outside equipment is decayed, by pipeline, ventilation and heat is carried out to equipment, by the active noise reduction assembly arranged in pipeline, low-frequency noise is processed, equipment external noise Whole frequency band is reduced, excellent noise reduction effect, without the need to again transforming equipment, make original Rational structure exempt from destruction, practicality is stronger.
Description
Technical field
The present invention relates to electronic applications, particularly a kind of sound arrester and electronic equipment.
Background technology
Usually dispel the heat at inside communication equipment provided with fan, can produce noise, affect surrounding environment when fan runs, the noise grade of especially many communication facilitiess exceeds standard or rules and regulations, has a strong impact on the physical and mental health of neighbouring staff or resident.
At present, for the equipment that noise is larger, cabinet carries out noise reduction, generally that a kind of sound arrester is installed in addition to cabinet finished product, this sound arrester is generally the pipeline that laid inside has acoustic absorbant, during this Pipe installing, need to carry out secondary transformation to the cabinet finished product completing processing, such as on cabinet, process a hole etc. passed through for this pipeline, thus this pipeline is fixedly mounted on cabinet, one end is placed in cabinet inside, the other end is placed in cabinet outside through cabinet, by pipeline to cabinet ventilation and heat, simultaneously owing to being equipped with acoustic absorbant in pipeline, as materials such as polyurethane, thus there is noise elimination function.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
Due in sound arrester of the prior art, acoustic absorbant can only carry out absorption noise reduction to high-frequency noises, because this duct length is limited, the noise reduction being laid on the acoustic absorbant in pipeline is very limited, and cannot process low-frequency noise, noise reduction is single, can not practical requirement; And need to carry out secondary transformation to casing structure when installing, could by this Pipe installing on cabinet, for the cabinet finished product completing production, the cabinet finished product particularly come into operation, carry out improvement and installation again, in practical operation, engineering is complicated and be difficult to realize; In addition, in communication machine box, size and the structural arrangement of associated components generally all have standard, the installation of this pipeline causes original rational structure to be destroyed, have influence on the correlation function and outward appearance etc. of cabinet, and communication machine box inner structure is compact, pipeline cannot be inserted wherein generally at all.
Summary of the invention
In order to solve, prior art noise reduction is single, in actual installation practice engineering complicated and be difficult to realize and affect the correlation function of cabinet and outward appearance and problem, embodiments provide a kind of sound arrester and electronic equipment.Described technical scheme is as follows:
First aspect, a kind of sound arrester is provided, described sound arrester cover is contained in device external, described sound arrester is used for described equipment noise reduction, described equipment is provided with air inlet and air outlet, described sound arrester comprises: shell, pipeline and active noise reduction assembly, described jacket is contained in described device external, described shell is provided with import and outlet, between described import and described air inlet, all connected by described pipeline between described air outlet and described outlet, described active noise reduction assembly is provided with in every bar pipeline, described shell is for the treatment of high-frequency noises, described pipeline is used for described equipment and ventilates, described active noise reduction assembly is for the treatment of low-frequency noise.
In the first possible implementation of first aspect, described active noise reduction assembly comprises with reference to microphone, loudspeaker and controller, the described side being arranged on close described equipment in described pipeline with reference to microphone, described loudspeaker and described controller are all arranged in described pipeline, and described controller connects described with reference to microphone and described loudspeaker respectively; During work, described reference microphone receives noise and produces reference signal, and send described reference signal to described controller, described controller produces according to described reference signal signal of eliminating the noise accordingly, and send described noise elimination signal transmission to described loudspeaker, thus counteracting noise reduction is carried out to described noise.
In conjunction with the first possible implementation of first aspect, in the implementation that the second is possible, described active noise reduction assembly also comprises error microphone, described error microphone is arranged on the side near described sound arrester in described pipeline, described loudspeaker is between described reference microphone and described error microphone, and described loudspeaker is near described error microphone, described controller connects described with reference to microphone, described error microphone and described loudspeaker respectively, described error microphone for generation of error signal, and sends described controller to.
In conjunction with the first possible implementation of first aspect or the possible implementation of the second of first aspect, in the implementation that the third is possible, described is single directional microphone with reference to microphone, and the described junction pointing to described pipeline and described equipment with reference to microphone.
In conjunction with the third possible implementation of first aspect, in the 4th kind of possible implementation, the described position with reference to microphone meets inequality: [d
ne-(d
nr+ d
ce)]/c>t0, wherein:
The velocity of sound in c-air,
The circuit that active noise reduction assembly described in t0-exists and algorithm time delay,
D
nrthe junction of-described pipeline and described equipment to the described air line distance with reference to microphone,
D
nethe junction of-described pipeline and described equipment to the distance of described error microphone,
D
ce-described loudspeaker is to the air line distance of described error microphone.
In the 5th kind of possible implementation of first aspect, described shell comprises fore shell, back cover and top shell, and described fore shell, described back cover and described top shell are close to the front portion of described equipment, rear portion and top respectively.
In conjunction with the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation, the thickness of described fore shell, described back cover and described top shell is all less than or equal to 15 centimetres, and the width of described fore shell, described back cover and described top shell is equal to the width of described equipment.
In conjunction with implementation, the third possible implementation of first aspect, the 4th kind of possible implementation of first aspect, the 5th kind of possible implementation of first aspect, the 6th kind of possible implementation of first aspect that the second of the first possible implementation of first aspect, first aspect, first aspect is possible, in the 7th kind of possible implementation, in described pipeline, be all equipped with acoustic absorbant.
In conjunction with the 7th kind of possible implementation of first aspect, in the 8th kind of possible implementation, described import comprises upper inlet and lower inlet, described air inlet comprises enterprising air port and lower air inlet, connected by described pipeline between described upper inlet and described lower air inlet, connected by described pipeline between described lower inlet and described enterprising air port.
In conjunction with the 7th kind of possible implementation of first aspect or the 8th kind of possible implementation of first aspect, the xsect of described pipeline is rectangle, and the cutoff frequency value of the noise plane wave passed through in the pipeline corresponding to length on described transversal face length limit is more than or equal to the target frequency value that will process noise.
Second aspect, provides a kind of electronic equipment, and described electronic equipment comprises sound arrester and equipment, and described sound arrester cover is contained in described device external.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
The sound arrester that the embodiment of the present invention provides, the outside of the equipment of being contained in directly is covered by shell, the high-frequency noises of prevention equipment is directly to external radiation, high-frequency noises outside equipment is decayed, by pipeline, ventilation and heat is carried out to equipment, by the active noise reduction assembly arranged in pipeline, low-frequency noise is processed, equipment external noise Whole frequency band is reduced, the optimal design so combined by high and low frequency noise reduction technology, noise reduction is better; And, when the embodiment of the present invention is arranged on equipment, directly be contained in device external by jacket, be connected with the ventilating opening of equipment by pipeline, without the need to again transforming equipment itself, original Rational structure is made to exempt from destruction, do not affect the original function of equipment, practical operation is very convenient, and outward appearance is also attractive in appearance, and can for the sound arrester of the equipment de-sign correspondingly-sized of different size, practicality is stronger.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation that sound arrester that the embodiment of the present invention provides is arranged on equipment;
Fig. 2 is the structural representation that sound arrester that further embodiment of this invention provides is arranged on equipment;
Fig. 3 is the structural representation that sound arrester that further embodiment of this invention provides is arranged on equipment;
Fig. 4 is the control algolithm schematic diagram of the active noise reduction assembly that the embodiment of the present invention provides;
Fig. 5 is the typical position sound pressure level third-octave analysis chart that the embodiment of the present invention provides.
Wherein: 1 sound arrester,
11 shells, 111 fore shells, 112 back covers, 113 top shells,
12 pipelines,
13 active noise reduction assemblies,
131 with reference to microphone, 132 loudspeakers, 133 controllers, 134 error microphone
14 imports, 141 upper inlets, 142 lower inlets,
15 outlets,
2 equipment,
21 air inlets, 211 enterprising air ports, 212 times air inlets,
22 air outlets,
3 fans.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As shown in Figure 1, the embodiment of the present invention provides a kind of sound arrester 1, it is outside that cover is contained in equipment 2, described sound arrester 1 is for described equipment 2 noise reduction, described equipment 2 is provided with air inlet 21 and air outlet 22, described sound arrester 1 comprises: shell 11, pipeline 12 and active noise reduction assembly 13, it is outside that described shell 11 cover is contained in described equipment 2, described shell 11 is provided with import 14 and outlet 15, between described import 14 and described air inlet 21, all connected by described pipeline 12 between described air outlet 22 and described outlet 15, described active noise reduction assembly 13 is provided with in every bar pipeline 12, described shell 11 is for the treatment of high-frequency noises, described pipeline 12 ventilates for described equipment 2, described active noise reduction assembly 13 is for the treatment of low-frequency noise.
Wherein, those skilled in the art are known, can utilize the space between the outer wall of equipment 2 and shell 11, the passage of self-assembling formation equipment 2 heat dissipation ventilation, so also can arrange pipeline 12 specially, can reach ventilation purpose, be the more compact practicality of structure of whole sound arrester 1; The size of whole sound arrester 1 can be produced flexibly according to the size of the equipment 2 of reality, to facilitate the installation needs of different model equipment 2; Active noise reduction is a kind of New Electronic Techniques, adopt reverse signal to offset noise acoustic energy, raw noise is resisted by the mirror image of noise, passive noise control refers to the passive noise reduction technology not needing mains power, in the embodiment of the present invention, active noise reduction assembly 13 adopts active noise reduction technology to carry out counteracting process to low-frequency noise, and shell 11 pairs of high-frequency noises are isolated, then adopt passive noise control technology, the embodiment of the present invention is by active and optimal design that is passive noise control combine with technique, equipment 2 external noise Whole frequency band is reduced, and noise reduction is better.
The sound arrester 1 that the embodiment of the present invention provides, the outside being contained in equipment 2 is directly covered by shell 11, and mark off some pipelines 12 according to the air inlet 21 of equipment 2 and air outlet 22, the import 14 of sound arrester 1 and the air inlet 21 of equipment 2, all connected by pipeline 12 between outlet 15 and air outlet 22, cold air outside equipment 2 is entered the pipeline 12 in sound arrester 1 by the import 14 on sound arrester 1, via air inlet 21 access arrangement 2 of pipeline 12 and equipment 2, hot-air in equipment 2 is entered the pipeline 12 in sound arrester 1 by the air outlet 22 of equipment 2, outlet 15 via pipeline 12 and sound arrester 1 arrives outside equipment 2, sound arrester 1 shell 11 has sound insulation effect, the high-frequency noises of prevention equipment 2 is directly to external radiation, high-frequency noises outside equipment 2 is decayed, active noise reduction assembly 13 in pipeline 12 is then processed the low-frequency noise spread out of by pipeline 12, equipment 2 external noise Whole frequency band is reduced, so by active and optimal design that is passive noise control combine with technique, noise reduction is better, and, when the embodiment of the present invention is arranged on equipment 2, without the need to itself transforming equipment 2, original Rational structure is made to exempt from destruction, directly be contained in equipment 2 by shell 11 cover outside, be connected by the ventilating opening of pipeline 12 with equipment 2, do not affect the original function of equipment 2, practical operation is very convenient, outward appearance is also attractive in appearance, and the sound arrester 1 of correspondingly-sized can be designed for the equipment 2 of different size, practicality is stronger.
As shown in Figure 2, particularly, as preferably, described active noise reduction assembly (see Fig. 1) comprises with reference to microphone 131, loudspeaker 132 and controller 133, the described side being arranged on close described equipment 2 in described pipeline 12 with reference to microphone 131, described loudspeaker 132 and described controller 133 are all arranged in described pipeline 12, and described controller 133 connects described with reference to microphone 131 and described loudspeaker 132 respectively.During work, equipment 2 inside is provided with fan 3, fan 3 rotates and produces noise, reference microphone 131 near equipment 2 receives noise and produces a reference signal thus, then controller 133 is sent to, controller 133 storage inside has a lot of signal data, according to the difference of reference signal, controller 133 is transferred the signal data of storage and is produced signal of eliminating the noise accordingly, this noise elimination signal transmission is sent to loudspeaker 132, thus counteracting noise reduction is carried out to original noise, wherein, those skilled in the art easily learn, also other places in pipeline 12 can be arranged on reference to microphone 131, as long as the object offsetting noise finally can be reached, the thinking of the embodiment of the present invention be to control in pipeline 12 any noise to control pipeline 12 to extraradial noise, namely when the counteracting sound sent at certain some loudspeaker 132 can mate original noise, sound is offset in all places, pipeline 12 downstream can mate original noise, prerequisite is the noise in pipeline 12 is propagate with plane wave form, the counteracting noise that loudspeaker 132 sends also is plane wave, at certain, a bit the two mates, namely amplitude is equal, phase place is contrary, then the downstream position of these two plane waves loudspeaker 132 in pipeline 12 mates everywhere, original noise is offset, therefore, for the noise needed with active noise reduction assembly (see Fig. 1) noise reduction, it must be made only to propagate with the form of plane wave in pipeline 12.
As shown in Figure 2, further, described active noise reduction assembly (see Fig. 1) also comprises error microphone 134, described error microphone 134 is arranged in described pipeline 12 near the side of described sound arrester 1, described loudspeaker 132 is between described reference microphone 131 and described error microphone 134, and described loudspeaker 132 is near described error microphone 134, described controller 133 connects described with reference to microphone 131 respectively, described error microphone 134 and described loudspeaker 132, described error microphone 134 is for generation of error signal, and send described controller 133 to.。
Wherein, the embodiment of the present invention is on the basis of a upper embodiment, active noise reduction assembly (see Fig. 1) adds error microphone 134, error microphone 134 is arranged on the side near sound arrester 1 in pipeline 12, make active noise reduction assembly (see Fig. 1) that adaptive pattern can be worked in, namely after controller 133 makes loudspeaker 132 send noise elimination signal according to reference signal, the noise elimination signal that noise in error microphone 134 receiving pipeline 12 and loudspeaker 132 send, and carry out combination generation error signal, this error signal is passed to controller 133 by error microphone 134, controller 133 combines according to reference signal and error signal, feedforward single channel adaptive control algorithm is adopted to calculate generation noise elimination signal, utilize the parameter in this signal data real-time update controller 133, send loudspeaker 132 to makes it send corresponding sound simultaneously, original noise is offset, thus make the square minimum of the sound pressure amplitude at error microphone 134 place, benefit so is, by error signal and the reference signal combination of error microphone 134, the noise elimination signal that controller 133 is produced is more accurate, and de-noising effect is better, and, the signal data stored in controller 133 can be constantly updated, more be conducive to the elimination of various frequency noise in pipeline 12, those skilled in the art easily learn, error microphone 134 also can be arranged on other places in pipeline 12, as long as the object offsetting noise finally can be reached, the controller 133 of active noise reduction assembly (see Fig. 1) generally has two kinds of modes, one is independent mode, namely controller 133 physics is independent, often organize active noise reduction assembly (see Fig. 1) and have independently controller 133 circuit board, independently digital signal processing dsp chip and interface etc., interface connects corresponding reference microphone 131, loudspeaker 132, the interface of error microphone 134, this controller 133 can be installed near corresponding loudspeaker 132, another kind is integrated on one piece of circuit board by the controller 133 in bar pipeline 12 each in sound arrester 1, even only the information in each bar pipeline 12 is processed with one piece of high-end dsp chip simultaneously, this circuit board also comprises the total interface of each bar pipeline 12, this circuit board can be installed on the place not forming pipeline 12 in sound arrester 1, as the side of ventilating duct 12 non-in top shell 113, also can make the form of communication cabinet standard plate, be installed in the interpolation frame of communication cabinet inside.
As shown in Figure 2, further, described is single directional microphone with reference to microphone 131, and the described junction pointing to described pipeline 12 and described equipment 2 with reference to microphone 131.Wherein, in the pipeline 12 be connected with equipment 2 air inlet 21, with reference to the air inlet 21 of microphone 131 sensing equipment 2; And in the pipeline 12 be connected with equipment 2 air outlet 22, with reference to the air outlet 22 of microphone 131 sensing equipments 2, setting like this is so that the noise spread out of with reference to the better receiving equipment 2 of microphone 131, in reduction pipeline 12, various reflected sound is in the interference with reference to microphone 131 place, those skilled in the art easily learn, also other places in pipeline 12 can be pointed to, as long as the noise that final energy receiving equipment 2 spreads out of with reference to microphone 131.
As preferably, the described position with reference to microphone meets inequality: [dne-(dnr+dce)]/c>t0,
Wherein: the velocity of sound in c-air, the circuit that t0-active noise reduction assembly exists and algorithm time delay, the junction of pipeline described in dnr-and described equipment is to the described air line distance with reference to microphone, the junction of pipeline described in dne-and described equipment is to the distance of described error microphone, and loudspeaker described in dce-is to the air line distance of described error microphone.In reality, volume with reference to microphone, loudspeaker and error microphone is general all very little, and diameter approximately can reach 1 cm, so, in the embodiment of the present invention, each parts all can be considered as a point, and the distance namely between each parts can be considered as the distance of point-to-point.
As shown in Figure 3, particularly, as preferably, described shell 11 comprises fore shell 111, back cover 112 and top shell 113, and described fore shell 111, described back cover 112 and described top shell 113 are close to the front portion of described equipment 2, rear portion and top respectively.In the present embodiment, equipment 2 is communication cabinet, communication cabinet inside is provided with fan 3, fan 3 rotates and produces noise, sound arrester (see Fig. 1) is arranged on communication cabinet outside, the air inlet 21 of communication cabinet is generally arranged on front portion, and air outlet 22 is generally arranged on rear portion, front and rear in the present embodiment refers to, communication cabinet is common front and rear when putting orientation when normal use, in actual production, the shell 11 being preferable over a sound arrester (see Fig. 1) is divided into three parts, fore shell 111 is arranged on rack front portion and covers air inlet 21, back cover 112 is arranged on rack rear portion and covers air outlet 22, top shell 113 is arranged on the top of rack, for fore shell 111 and back cover 112 are connected and fixed, the left and right sides of rack then covers without sound arrester (see Fig. 1), so, material can also be saved while reaching noise reduction, certainly, those skilled in the art are known, sound arrester (see Fig. 1) also can be processed into an entirety, all cover dress is carried out to communication cabinet surrounding, namely the communication cabinet left and right sides is also covered, during practical operation, can specifically according to actual conditions needs, processing is applicable to the structure of equipment 2 needs.
As shown in Figure 3, further, the thickness of described fore shell 111, described back cover 112 and described top shell 113 is all less than or equal to 15 centimetres, and the width of described fore shell 111, described back cover 112 and described top shell 113 is equal to the width of described equipment 2.The thickness of sound arrester (see Fig. 1) is preferably more than 15cm, if too thick meeting causes weight excessive, though there is noise reduction, and impracticable; Equipment 2 in the present embodiment is common when putting orientation when normal use, the left and right sides of sound arrester (see Fig. 1) not overlay device 2, the edge of sound arrester (see Fig. 1) left and right sides is concordant with the edge of equipment 2 left and right sides, so the width of the fore shell 111 of sound arrester, back cover 112 and top shell 113 transverse direction will equal the width of equipment 2 transverse direction.
As preferably, in described pipeline, be all equipped with acoustic absorbant.
As shown in Figure 3, as preferably, described import 14 comprises upper inlet 141 and lower inlet 142, described air inlet 21 comprises enterprising air port 211 and lower air inlet 212, connected by described pipeline 12 between described upper inlet 141 and described lower air inlet 212, connected by described pipeline 12 between described lower inlet 142 and described enterprising air port 211.
Wherein, those skilled in the art are known, acoustic absorbant can have multiple, at the laid inside acoustic absorbant of pipeline 12, as laid the thick polyurethane sound absorption material etc. of 30mm, those skilled in the art are known, acoustic absorbant can all be laid in pipeline 12 inside, also can lay by local emphasis, also can arrange flexibly according to physical condition, thus further noise reduction is carried out to high-frequency noises, therefore the noise reduction of pipeline 12 length on high-frequency noises has impact, pipeline 12 is longer, the acoustic absorbant laid is more, noise reduction is better, under equipment 2 size constraint, increase pipeline 12 length as far as possible, the principle that upper-lower position intersects is utilized in the present embodiment, namely connected by pipeline 12 between upper inlet 141 and described lower air inlet 212, connected by pipeline 12 between lower inlet 142 and enterprising air port 211, the length of pipeline 12 so can be made to increase as far as possible, improve noise reduction, acoustic absorbant noise reduction belongs to passive noise control technology.
As preferably, the xsect of described pipeline is rectangle, and the cutoff frequency value of the noise plane wave passed through in the pipeline corresponding to length on described transversal face length limit is more than or equal to the target frequency value that will process noise.
The xsect of pipeline refers to the cross section perpendicular to pipeline outer wall, according to actual needs, artificially can determine the target frequency value that will process noise, this target frequency value is generally less than and equals 800Hz, and need to propagate with the form of plane wave in pipeline lower than the noise of this target frequency value, could be eliminated by active noise reduction assembly, so the noise plane wave cutoff frequency f that pipeline passes through
cthis target frequency value should be more than or equal to, f
ccan according to following formulae discovery with the relation of the length on conduit cross-sectional face length limit:
Wherein: c is the velocity of sound in air, l
maxfor the length on conduit cross-sectional face length limit.The cross-sectional area of pipeline is less, more be conducive to active noise reduction assembly stress release treatment, but the cross-sectional area of pipeline is too little can affect pipe ventilated, its mentality of designing is little as far as possible when not affecting pipe ventilated amount, and the ventilation of pipeline is certain, so the area of the xsect of pipeline can be determined, the length on conduit cross-sectional face length limit can calculate, then can determine the length of cross-section of pipeline minor face.The distance of loudspeaker and error microphone can not be too little, thus make that the output of loudspeaker is too little affects noise reduction, general d
cebe not less than 100mm, d in the embodiment of the present invention
cebe taken as 150mm, the circuit that active noise reduction assembly exists and algorithm time delay are 0.5ms, therefore d
ne-d
nr>322mm, is namely not less than 322mm with reference to microphone and error microphone distance, the minimum length of Here it is whole active noise reduction assembly, and the length that the pipeline of active noise reduction assembly is housed at least is greater than this minimum length.
As shown in Figure 4, embodiments provide the control algolithm of active noise reduction assembly, for the FXLMS algorithm of classics, wherein: x (n) represents reference signal, namely with reference to the noise signal at microphone place, d (n) represents the noise signal at error microphone place, and P represents the transport function of reference signal to error microphone, therefore d (n)=x (n) * P; C represents control wave filter, and control wave filter C and be present in controller, y (n) represents the output controlling wave filter C, and S represents secondary channel transport function, and namely secondary sound source is to the transport function of error microphone,
represent y (n) at the noise information at error microphone place after secondary channel, therefore
if Active noise control using strategy is proper,
equal with d (n) amplitude, phase place is contrary, and can reach desirable noise reduction, the error signal e (n) that corresponding error microphone place finally obtains will equal or close to zero.The core content of FXLMS algorithm be exactly by constantly adjust control wave filter C parameter to reach the object at error microphone place restraint speckle as much as possible.For real system, controlling wave filter C is present in controller, controller obtains reference signal from reference to microphone, calculate output signal and feed back to loudspeaker, loudspeaker is sounded and is offset noise, meanwhile, controller obtains error signal from error microphone, the coefficient of regulable control wave filter C.The fan of communication cabinet arranges some duties usually, switches in each duty according to temperature variation, and each duty rotation speed of the fan is different, its Noise Characteristic also respective change produced, under arbitrary particular job state, rotation speed of the fan is constant, its Noise Characteristic is the same, is steady state noise.The mode of operation of active noise reduction assembly has self-adaptation and non-self-adapting two kinds, when active noise reduction assembly is in self-adaptation mode of operation, when fan work is in a certain steady job state, because noise is stable, the parameter controlling wave filter C is also very stable, substantially do not change, when fan operating state switches to another duty, Noise Characteristic plays change, due to the adaptive characteristic of controller, control wave filter C change and converge to new value, then enter steady state (SS); When active noise reduction assembly is in non-self-adapting mode of operation, fan can be allowed in advance to be in a certain duty, then obtain the parameter after controlling wave filter C convergence according to self-adaptation mode of operation and store, again fan is switched to other duty, the parameter of the control wave filter C of correspondence is stored one by one; In communication facilities actual moving process, according to the duty of fan, controller loads the output that corresponding control filter parameter C carrys out computing controller, when fan noise is stablized, the noise reduction of non-adaptive mode of operation and a few indistinction of noise reduction of self-adaptation mode of operation, now can not need error signal, also not need error microphone, active noise reduction assembly is stablized and is not subject to external interference, and reduce active noise reduction assembly complexity.
As shown in Figure 5, embodiments provide typical position sound pressure level third-octave analysis chart, frequency values centered by transverse axis, the longitudinal axis is sound pressure level, in the present embodiment, equipment is communication cabinet, when not installing sound arrester, according to the outer typical position place of rack in figure noise spectrum, this noise is broadband noise as seen, from 200Hz to 3150Hz, each third-octave sound pressure level is all comparatively average, and overall sound pressure level is 49.0dBA, and when sound arrester (comprise in pipeline and attach acoustic absorbant) being installed but not opening active noise reduction function, according to the outer typical position place of rack in figure noise spectrum, visible each band noise has reduction, medium-high frequency noise reduction is large, from 1000Hz to 3150Hz, each third-octave has the noise reduction of more than 15dBA, low frequency noise reduction is less, from 250Hz to 500Hz, each third-octave noise reduction is 4 ~ 6dBA, 250Hz following third-octave noise reduction is maximum is only 1.9dBA, now overall sound pressure level is 40.9dBA, namely passive noise control method noise reduction is 8.1dBA, observe spectral characteristics of noise now, visible high-frequency noises is lower, low-frequency noise is higher, the noise of active noise reduction components process is needed to be mainly the noise of each third-octave of 160Hz to 630Hz, when sound arrester (comprise in pipeline and attach acoustic absorbant) being installed and opening active noise reduction function, according to the outer typical position place of rack in figure noise spectrum, with do not open compared with active noise reduction function, low frequency range noise reduces obviously, and the third-octave noise reduction as frequency centered by 315Hz is 10.8dBA.Now each third-octave sound pressure level of residual noise is comparatively average, and overall sound pressure level is 36.2dBA, and namely newly-increased noise reduction is 4.7dBA, and the overall noise reduction of sound arrester is 12.8dBA.
As shown in Figure 1, the embodiment of the present invention provides a kind of electronic equipment, and described electronic equipment comprises sound arrester 1 and equipment 2, and it is outside that described sound arrester 1 cover is contained in described equipment 2.Wherein, sound arrester 1 can see above all embodiments.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a sound arrester, it is characterized in that, described sound arrester cover is contained in device external, described sound arrester is used for described equipment noise reduction, described equipment is provided with air inlet and air outlet, described sound arrester comprises: shell, pipeline and active noise reduction assembly, described jacket is contained in described device external, described shell is provided with import and outlet, between described import and described air inlet, all connected by described pipeline between described air outlet and described outlet, described active noise reduction assembly is provided with in pipeline described in every bar, described shell is for the treatment of high-frequency noises, described pipeline is used for described equipment and ventilates, described active noise reduction assembly is for the treatment of low-frequency noise,
The xsect of described pipeline is rectangle, the cutoff frequency f of the noise plane wave passed through in the pipeline corresponding to length on described transversal face length limit
cbe more than or equal to the target frequency value that will process noise;
Described f
cwith the pass of the length on the described transversal face length limit of described pipeline be:
Wherein: c is the velocity of sound in air, l
maxfor the length on conduit cross-sectional face length limit.
2. sound arrester according to claim 1, it is characterized in that, described active noise reduction assembly comprises with reference to microphone, loudspeaker and controller, the described side being arranged on close described equipment in described pipeline with reference to microphone, described loudspeaker and described controller are all arranged in described pipeline, and described controller connects described with reference to microphone and described loudspeaker respectively; During work, described reference microphone receives noise and produces reference signal, and send described reference signal to described controller, described controller produces according to described reference signal signal of eliminating the noise accordingly, and send described noise elimination signal transmission to described loudspeaker, thus counteracting noise reduction is carried out to described noise.
3. sound arrester according to claim 2, it is characterized in that, described active noise reduction assembly also comprises error microphone, described error microphone is arranged on the side near described sound arrester in described pipeline, described loudspeaker is between described reference microphone and described error microphone, and described loudspeaker is near described error microphone, described controller connects described with reference to microphone, described error microphone and described loudspeaker respectively, described error microphone for generation of error signal, and sends described controller to.
4. sound arrester according to claim 3, is characterized in that, described is single directional microphone with reference to microphone, and the described junction pointing to described pipeline and described equipment with reference to microphone.
5. sound arrester according to claim 4, is characterized in that, the described position with reference to microphone meets inequality: [d
ne-(d
nr+ d
ce)]/c>t0, wherein:
The velocity of sound in c-air,
The circuit that active noise reduction assembly described in t0-exists and algorithm time delay,
D
nrthe junction of-described pipeline and described equipment to the described air line distance with reference to microphone,
D
nethe junction of-described pipeline and described equipment to the distance of described error microphone,
D
ce-described loudspeaker is to the air line distance of described error microphone.
6. sound arrester according to claim 1, is characterized in that, described shell comprises fore shell, back cover and top shell, and described fore shell, described back cover and described top shell are close to the front portion of described equipment, rear portion and top respectively.
7. sound arrester according to claim 6, is characterized in that, the thickness of described fore shell, described back cover and described top shell is all less than or equal to 15 centimetres, and the width of described fore shell, described back cover and described top shell is equal to the width of described equipment.
8. the sound arrester according to claim 1-7 any one claim, is characterized in that, is all equipped with acoustic absorbant in described pipeline.
9. sound arrester according to claim 8, it is characterized in that, described import comprises upper inlet and lower inlet, described air inlet comprises enterprising air port and lower air inlet, connected by described pipeline between described upper inlet and described lower air inlet, connected by described pipeline between described lower inlet and described enterprising air port.
10. an electronic equipment, is characterized in that, described electronic equipment comprises sound arrester described in claim 1-9 any one claim and equipment, and described sound arrester cover is contained in described device external.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210475736.5A CN103021399B (en) | 2012-11-21 | 2012-11-21 | A kind of sound arrester and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210475736.5A CN103021399B (en) | 2012-11-21 | 2012-11-21 | A kind of sound arrester and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103021399A CN103021399A (en) | 2013-04-03 |
| CN103021399B true CN103021399B (en) | 2015-11-25 |
Family
ID=47969932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210475736.5A Active CN103021399B (en) | 2012-11-21 | 2012-11-21 | A kind of sound arrester and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103021399B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103268764B (en) * | 2013-05-09 | 2015-11-18 | 浙江大学 | A kind of converter plant based on active noise control in space |
| CN105283028B (en) * | 2014-06-26 | 2019-07-09 | 中兴通讯股份有限公司 | A kind of denoising device and method |
| CN105185369A (en) * | 2015-08-19 | 2015-12-23 | 哈尔滨城林科技股份有限公司 | Sound attenuating system for low-noise integrated equipment cabinet used for communication |
| CN105139861B (en) * | 2015-08-24 | 2018-08-17 | 昆明科林科技工程有限公司 | A kind of reduction method and device administered for man-made noise |
| CN105555103B (en) * | 2016-01-08 | 2018-05-29 | 烽火通信科技股份有限公司 | A kind of veneer and analog veneer coupled based on heat dissipation with noise reduction balance |
| CN107393545B (en) * | 2017-07-17 | 2020-12-08 | 会听声学科技（北京）有限公司 | Feedback type active noise reduction system and method with flexible gain |
| CN107333455B (en) * | 2017-08-17 | 2023-09-12 | 上海电力设计院有限公司 | Ventilating trench and isolation device |
| CN107939481B (en) * | 2017-12-11 | 2023-12-22 | 四川三元环境治理股份有限公司 | Using method of active control system of smoke exhaust pipeline |
| CN110007731A (en) * | 2019-05-23 | 2019-07-12 | 席赫岐 | A kind of desktop computer case with a variety of noise reduction modes |
| CN117967614A (en) * | 2022-10-26 | 2024-05-03 | 中兴通讯股份有限公司 | Noise reduction device and communication equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201650452U (en) * | 2010-04-22 | 2010-11-24 | 任小平 | Silencing device of diesel generating set |
| CN201896647U (en) * | 2010-12-15 | 2011-07-13 | 任小平 | Mobile diesel generator set silencing device |
| CN202065062U (en) * | 2011-04-28 | 2011-12-07 | 任小平 | Novel moveable silencing device of diesel power generating set |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0527774A (en) * | 1991-07-22 | 1993-02-05 | Hitachi Plant Eng & Constr Co Ltd | Electronic noise elimination device for opening part radiation noise |
| JPH07210169A (en) * | 1994-01-24 | 1995-08-11 | Nippon Steel Corp | Muffler device |
-
2012
- 2012-11-21 CN CN201210475736.5A patent/CN103021399B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201650452U (en) * | 2010-04-22 | 2010-11-24 | 任小平 | Silencing device of diesel generating set |
| CN201896647U (en) * | 2010-12-15 | 2011-07-13 | 任小平 | Mobile diesel generator set silencing device |
| CN202065062U (en) * | 2011-04-28 | 2011-12-07 | 任小平 | Novel moveable silencing device of diesel power generating set |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103021399A (en) | 2013-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103021399B (en) | A kind of sound arrester and electronic equipment | |
| CN108916952B (en) | Range hood with three-dimensional space sound field noise reduction device and noise reduction method | |
| CN108088064B (en) | Active noise reduction device arranged on ventilation pipe orifice and capable of realizing acoustic interaction and control method | |
| CN101930731B (en) | Mining multi-wave self-adaptive active noise control system | |
| CN102170602A (en) | Active noise reduction system | |
| WO2021004166A1 (en) | Ducted air conditioner | |
| CN107600011A (en) | The active control noise reduction system and method for a kind of automobile engine noise | |
| CN105927816A (en) | Air conduit device with active noise reduction function and noise reduction method | |
| CN102208263A (en) | Multi-channel active noise control system for power transformer | |
| CN102915741A (en) | Equal loudness contour based method for automatically recovering tone of voice signal according to volume adjustment | |
| CN103807995A (en) | Combined type array impedance recombination silencer | |
| Hasegawa et al. | Window active noise control system with virtual sensing technique | |
| CN201698745U (en) | Mining multi-wave self-adaptive active noise control device | |
| CN104835487A (en) | Household active noise reduction system and noise reduction control method thereof | |
| CN105283028A (en) | Noise reduction device and method | |
| CN102081368B (en) | Distributed feedforward active control system | |
| CA2124183C (en) | Active noise control of an enclosure with multiple transducers | |
| JP3290991B2 (en) | Active noise canceling muffler | |
| CN106251855B (en) | A kind of de-centralized virtual sound screen of for transformer noise reduction | |
| CN107939481B (en) | Using method of active control system of smoke exhaust pipeline | |
| WO2018208675A3 (en) | Common aperture extensible loudspeaker array | |
| CN205179290U (en) | Earphone structure | |
| CN210211951U (en) | Noise reduction device applied in automobile heat supply ventilation pipeline | |
| CN209744687U (en) | Active noise reduction device for air duct machine | |
| CN111101353A (en) | Clothes dryer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220309 Address after: 518111 room 510, Shanxia community neighborhood committee office building, No. 91, Xuri East Road, Shanxia community, Pinghu street, Longgang District, Shenzhen, Guangdong Province Patentee after: Shenzhen xinkailai Technology Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |
|
| TR01 | Transfer of patent right |