CN106469551A - A kind of pipeline noise reduction system and method - Google Patents
A kind of pipeline noise reduction system and method Download PDFInfo
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- CN106469551A CN106469551A CN201510512378.4A CN201510512378A CN106469551A CN 106469551 A CN106469551 A CN 106469551A CN 201510512378 A CN201510512378 A CN 201510512378A CN 106469551 A CN106469551 A CN 106469551A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17857—Geometric disposition, e.g. placement of microphones
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention provides a kind of pipeline noise reduction system and method, this pipeline noise reduction system includes：It is arranged at the reference microphone of close noise source in pipeline and the error microphone near pipe end, controller, be arranged at the secondary sound source on pipeline；Controller is used for obtaining the noise signal with reference to microphone and error microphone collection, generates control signal and transmits to secondary sound source, secondary sound source is according to control signal sounding noise reduction；Include at least two microphones with reference to microphone.By the enforcement of the present invention, one-dimensional plane sound wave along pipe transmmision can effectively be suppressed using Technique of Active Noise Control, its small volume, crushing is low, the deficiency of passive noise reduction can effectively be made up, and, reference signal is obtained using many microphones, can be with promotion signal quality, thus improving the anti-acoustic capability of system.
Description
Technical field
The present invention relates to field of noise control, more particularly, to a kind of pipeline noise reduction system and method.
Background technology
Ventilation shaft noise is a kind of common noise, the discharge duct of such as factory, interior in daily life
Noise in the vent discharge duct of transformator, the ventilation and heat pipeline of communication cabinet.Traditional noise-reduction method
For passive noise reduction, such as using sound-absorbing material fill pipe wall, although but sound-absorbing material can preferably press down
High-frequency noise processed, but limited by volume and crushing, its low frequency acoustic attenuation performance is typically unsatisfactory；Additionally,
For obtaining larger absorption, sound-absorbing material thickness is thicker, can tie up the space in pipeline, thus affecting to manage
Air-flow in road is propagated, and hinders the ventilation and heat function of pipeline.
Therefore, how to provide a kind of pipeline noise-reduction method being not take up pipeline inner volume, be people in the art
Member's technical problem urgently to be resolved hurrily.
Content of the invention
The invention provides a kind of pipeline noise reduction system and method, take pipeline body to solve existing passive noise reduction
Long-pending problem.
The invention provides a kind of pipeline noise reduction system, it includes：It is arranged at close noise source in pipeline
Error microphone with reference to microphone and near pipe end, controller, it is arranged at the secondary sound on pipeline
Source；Controller is used for obtaining the noise signal with reference to microphone and error microphone collection, generates control signal
And transmit to secondary sound source, secondary sound source is according to control signal sounding noise reduction；Include at least two with reference to microphone
Individual microphone.
Further, also include preamplifier, preamplifier be arranged at controller with reference to microphone and
Between error microphone, for amplifying noise signal.
Further, also include power amplifier, power amplifier is arranged between controller and secondary sound source,
For amplifying control signal, control signal is noise elimination signal.
Further, error microphone is arranged at pipe end, and secondary sound source is arranged at pipe side wall distance pipe
Road end a quarter duct length position, is arranged in pipeline near noise source position with reference to microphone.
Further, secondary sound source and time delay and the velocity of sound being not less than controller with reference to the distance between microphone
Long-pending.
Further, controller is weighted specifically for the unlike signal being gathered at least two microphones
Linear operation obtains reference signal, the end noise signal of pipeline according to error microphone collection and reference
Signal of change obtains control signal.
Further, include two microphones with reference to microphone, wherein one microphone against the noise source of pipeline,
Another microphone range noise source a quarter duct length.
Further, two microphones may be contained within the centrage of pipeline, and is omnidirectional microphone.
Present invention provides a kind of pipeline noise-reduction method, it is used for the pipeline noise reduction system that the present invention provides,
Including：Controller obtains the noise signal with reference to microphone and error microphone collection, generates control signal simultaneously
Transmit to secondary sound source；Secondary sound source is according to control signal sounding noise reduction.
Further, controller generates control signal and includes：The different letters that at least two microphones are gathered
Number being weighted linear operation obtains reference signal, the end noise letter of the pipeline according to error microphone collection
Number and reference signal calculate obtain control signal.
Beneficial effects of the present invention：
The invention provides a kind of new pipeline noise-reduction method, can effectively be pressed down using Technique of Active Noise Control
, along the one-dimensional plane sound wave of pipe transmmision, its small volume, crushing is low, can effectively make up passive noise reduction for system
Deficiency, and, reference signal obtained using many microphones, and can be with promotion signal quality, thus improving system
The anti-acoustic capability of system.
Brief description
The structural representation of the pipeline noise reduction system that Fig. 1 provides for first embodiment of the invention；
The flow chart of the pipeline noise-reduction method that Fig. 2 provides for second embodiment of the invention；
The structural representation of the pipeline noise reduction system that Fig. 3 provides for third embodiment of the invention；
Fig. 4 is the placement location schematic diagram of each device in third embodiment of the invention.
Specific embodiment
Now combined by specific embodiment and by way of accompanying drawing, the present invention is made with further annotation explanation.
First embodiment：
The structural representation of the pipeline noise reduction system that Fig. 1 provides for first embodiment of the invention, as shown in Figure 1,
In the present embodiment, the pipeline noise reduction system 1 that the present invention provides includes：
It is arranged at the reference microphone 11 of close noise source 3 in pipeline 2 and the mistake near pipeline 2 end
Difference microphone 12, controller 13, it is arranged at the secondary sound source 14 on pipeline 2；Controller 13 is used for obtaining
With reference to the noise signal of microphone 11 and error microphone 12 collection, generate control signal and transmit to secondary
Sound source 14, secondary sound source 14 is according to control signal sounding noise reduction；Include at least two biographies with reference to microphone 11
Sound device.
In certain embodiments, the pipeline noise reduction system 1 in above-described embodiment also includes preamplifier, front
Put amplifier and be arranged at controller 13 and with reference between microphone 11 and error microphone 12, make an uproar for amplifying
Acoustical signal.
In certain embodiments, the pipeline noise reduction system 1 in above-described embodiment also includes power amplifier, work(
Rate amplifier is arranged between controller 13 and secondary sound source 14, for amplifying control signal, control signal
For noise elimination signal.
In certain embodiments, the error microphone 12 in above-described embodiment is arranged at pipeline 2 end, secondary
Sound source 14 is arranged at pipeline 2 side wall apart from pipe end a quarter duct length position, with reference to microphone
11 are arranged in pipeline 2 near noise source 3 position.
In certain embodiments, the secondary sound source 14 in above-described embodiment and with reference between microphone 11 away from
With the velocity of sound long-pending from the time delay (main inclusion circuit and algorithm time delay) not less than controller 12.
In certain embodiments, the controller 13 in above-described embodiment is specifically for by least two microphone institutes
The unlike signal of collection is weighted linear operation and obtains reference signal, according to the pipeline of error microphone collection
End noise signal and reference signal calculate obtain control signal.
In certain embodiments, the reference microphone 11 in above-described embodiment includes two microphones, and wherein one
Microphone is against the noise source 3 of pipeline 2, another microphone range noise source a quarter duct length.
In certain embodiments, two microphones in above-described embodiment may be contained within the centrage of pipeline,
And it is omnidirectional microphone.
Second embodiment：
The flow chart of the pipeline noise reduction that Fig. 2 provides for second embodiment of the invention, as shown in Figure 2, in this reality
Apply in example, provided by the present invention for the present invention provide pipeline noise reduction system pipeline noise-reduction method include with
Lower step：
S201：Controller obtains the noise signal with reference to microphone and error microphone collection, generates and controls letter
Number and transmit to secondary sound source；
S202：Secondary sound source is according to control signal sounding noise reduction.
In certain embodiments, the controller in above-described embodiment generates control signal and includes：By at least two
The unlike signal that microphone is gathered is weighted linear operation and obtains reference signal, is adopted according to error microphone
The end noise signal of pipeline of collection and reference signal calculate and obtain control signal.
In conjunction with concrete application scene, the present invention is done with further annotation explanation.
3rd embodiment：
In the present embodiment, with certain communication apparatus have one for ventilation and heat pipeline 2, noise source 3 be for
The fan of ventilation and heat is to use scene.
As shown in Figures 3 and 4, pipeline noise reduction system 1 is by with reference to microphone 11, error microphone 12, secondary
Level sound source 14, controller 13 form；By the signal collecting with reference to microphone 11, error microphone 12
Before entering controller 13, first pass around the amplification of preamplifier 15, and controller 13 generation is defeated
Go out signal before entering secondary sound source 14, need the amplification through power amplifier 16.
In the present embodiment, all use all referring to transaudient to electret fine with reference to microphone 11, error microphone 12
Device, secondary sound source 14 uses speaker.
In the present embodiment, it is fixed on pipeline center position with reference to microphone 11, error microphone 12 support
Put, be centrally located on same straight line with noise source 3.
Have two microphones with reference to microphone 11 to constitute, be close to noise source 3 for one, another range noise
At the about 1/4L of source 3, wherein L is duct length.
Secondary sound source 14 is located at mouth of pipe 1/4L, and error microphone 12 is positioned at pipeline opening, to subtract
Small pipeline end reflection produces the impact of standing wave, with reference to air line distance Xrc of microphone 11 and secondary sound source 14
Xrc/c need to be met>T0, c are the velocity of sound, and t0 is circuit and the algorithm time delay of controller.
Controller 13 is used for controlling the output of its corresponding secondary sound source 14, so that its corresponding error is transaudient
Sound pressure amplitude square minimum at device 12.
As shown in figure 4, acoustic pressure pe at error microphone 12 comprises two parts, one is that noise source 3 produces
Acoustic pressure pne, two be secondary sound source 14 produce acoustic pressure pce, pce=pnr W Zc, wherein pnr
It is with reference to the acoustic pressure at microphone 11, W is that the acoustic pressure of reference microphone 11 inputs electricity to secondary sound source 14
The transmission function of signal, Zc is the biography of the acoustic pressure to error microphone 12 for the input electrical signal of secondary sound source 14
Delivery function.
Take pe squared magnitude minimum, for single channel system, that is, pe is 0, by
Pe=pne+pce=pne+pnr W Zc=0 can obtain：
W=-pne/(pnr.Zc)；
Transmission function Zc is recorded by off-line modeling mode before use, and pne is recorded by error microphone 12,
Pnr is recorded by with reference to microphone 11, by formula W=-pne/(pnr.Zc) calculate the value of W, and calculate (pnr
W) to drive secondary sound source 14, sound pressure amplitude square minimum at error microphone 12, controller 13 are made
Using feedforward single channel adaptive control algorithm.
In practice, due to typically there being the air-flow of larger speed in ventilation shaft, pneumatic noise will be produced,
Single directing microphone is more sensitive to pneumatic noise with respect to ball-and-biscuit microphone, and the signal being collected will
Produce larger pollution, therefore should not be using single directional microphone in this application scenarios.
Using full directing microphone, less sensitive to pneumatic noise for relatively single sensing, can also be by adding
Plus wind wimble structure is reducing the impact of pneumatic noise.
If but with reference to microphone 11 using full directing microphone, secondary sound source 14 can be to reference to microphone
11 produce very big secondary acoustic feedback.Now, full directing microphone collects under the influence of secondary acoustic feedback
Reference signal be：
pnr=qpZr(ω,xr)+qcZf(ω,xr)；
Wherein Zr, Zf are respectively noise source 3 and arrive with reference to microphone 11, and secondary sound source 14 arrives reference and passes
The transmission function of sound device 11, k is wave number, and R1, R2 are respectively the reflection system of sound source end and pipe end
Number.
pnr=qpZr(ω,xr)+qcZf(ω,xr) Section 1 collects from noise source 3 with reference to microphone 11 in formula
Original reference signals, Section 2 is that the useless reference signal that secondary sound source 14 arrives with reference to microphone 11 is (secondary
Acoustic feedback signal), when Section 1 is much smaller than Section 2, the reference signal master collecting with reference to microphone 11
Want composition to come from secondary acoustic feedback, and reference signal through controller 13 process after, controller 13 defeated
Go out and can again feed back to reference in microphone 11, thus forming a loop, the stability of impact system with
And anti-acoustic capability.
Therefore, for solving this problem, the occupied ratio in total reference signal of original reference signals need to be improved
Example, i.e. sound pressure level corresponding to the frequency of lifting original reference signals valley point.
In this regard, the present embodiment is examined microphone to obtain original reference signals using Radix Triplostegiae Grandiflorae, send again after computing
To controller 13, computing can be realized by analog circuit, such as, the signal of two microphones is used and adds
Musical instruments used in a Buddhist or Taoist mass becomes a road signal input controller it is also possible to realize by software after entering row operation, such as, two
The signal of microphone divides two-way input controller, can be in the interface chip (such as fpga, plc etc.) of controller
Enter row operation (similar adder) it is also possible to enter row operation with algorithm after being input to DSP, such as direct phase
Plus/weighting summation, etc..
Noise source 3 is close to by one of reference microphone, and another is with reference to the distance in microphone range noise source 3
For KL, L is duct length, and K is coefficient, between 0～3/4L.The acoustic pressure that two reference points are recorded
Average and be input to controller 13 as reference signal, this process can be realized by analog circuit,
Can be realized by the software program in digit chip in controller.
Now original reference signals are：
Acoustic pressure according to recording to two reference points under the conditions of different K values averages the reference signal obtaining can
Know, K=0.25 be two with reference to microphones at a distance of L/4 when, the corresponding sound pressure level of reference signal valley point frequency
Maximum, so be set to L/4 with reference to microphone spacing in system.
When taking above with reference to microphone distribution mode, according to two letters each collecting with reference to microphone
Number and the reference signal that obtained using two microphones signal operation understand, in below 600Hz low-frequency range, two
Individual have many valley points respectively with reference to microphone, but the valley point of the two interlock misaligned.
Therefore, it is used any one with reference to the signal of microphone alone as reference signal, in reference signal paddy
Noise reduction at dot frequency is all bad, and then affects the noise reduction of full frequency band.
The valley point sound pressure level of the reference signal being obtained using two microphones computing is substantially improved, and lifting capacity is in 20dB
Left and right, such that it is able to significantly weaken secondary acoustic feedback to the pollution of reference signal and to control result
Impact.
The present embodiment is averaged two signals with reference to microphones as reference signal it is also possible to according to this
Two signal spectrums with reference to microphone apply other linear operations, such as weighted average, to obtain more preferably
Noise reduction.
In summary, by the enforcement of the present invention, at least there is following beneficial effect：
One-dimensional plane sound wave along pipe transmmision, its volume can effectively be suppressed using Technique of Active Noise Control
Little, crushing is low, can effectively make up the deficiency of passive noise reduction, and, reference signal is come using many microphones
Obtain, can be with promotion signal quality, thus improving the anti-acoustic capability of system.
The above is only the specific embodiment of the present invention, not the present invention done with any pro forma restriction,
Every technical spirit according to the present invention embodiment of above is made arbitrarily simply modification, equivalent variations,
In conjunction with or modify, all still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. a kind of pipeline noise reduction system is it is characterised in that include：It is arranged at the close noise source in pipeline
Reference microphone and near pipe end error microphone, controller, be arranged on described pipeline
Secondary sound source；Described controller is used for obtaining the described noise with reference to microphone and the collection of described error microphone
Signal, generates control signal and transmits to described secondary sound source, described secondary sound source is according to described control signal
Sounding noise reduction；Described reference microphone includes at least two microphones.
2. pipeline noise reduction system as claimed in claim 1 is it is characterised in that also include preamplifier,
Described preamplifier is arranged between described controller and described reference microphone and described error microphone,
For amplifying described noise signal.
3. pipeline noise reduction system as claimed in claim 1 is it is characterised in that also include power amplifier,
Described power amplifier is arranged between described controller and described secondary sound source, believes for amplifying described control
Number, described control signal is noise elimination signal.
4. pipeline noise reduction system as claimed in claim 1 is it is characterised in that described error microphone sets
It is placed in described pipe end, described secondary sound source is arranged at described pipe side wall apart from four points of described pipe end
One of duct length position, described be arranged in described pipeline near noise source position with reference to microphone.
5. pipeline noise reduction system as claimed in claim 5 is it is characterised in that described secondary sound source and institute
State with the velocity of sound not less than the time delay of described controller long-pending with reference to the distance between microphone.
6. the pipeline noise reduction system as described in any one of claim 1 to 5 is it is characterised in that described control
The unlike signal that implement body processed is used for being gathered described at least two microphones is weighted linear operation and obtains
Reference signal, the end noise signal of the described pipeline according to the collection of described error microphone and described reference
Signal of change obtains described control signal.
7. pipeline noise reduction system as claimed in claim 6 it is characterised in that described with reference to microphone bag
Include two microphones, wherein one microphone is made an uproar apart from described against the noise source of described pipeline, another microphone
Sound source a quarter duct length.
8. pipeline noise reduction system as claimed in claim 7 is it is characterised in that described two microphone is equal
It is arranged on the centrage of described pipeline, and be omnidirectional microphone.
9. a kind of pipeline noise-reduction method is it is characterised in that be used for as described in any one of claim 1 to 8
Pipeline noise reduction system, including：
Described controller obtains the described noise signal with reference to microphone and the collection of described error microphone, generates
Control signal is simultaneously transmitted to described secondary sound source；
Described secondary sound source is according to described control signal sounding noise reduction.
10. pipeline noise-reduction method as claimed in claim 9 is it is characterised in that described controller generates control
Signal processed includes：The unlike signal that described at least two microphones are gathered is weighted linear operation and obtains
Reference signal, the end noise signal of the described pipeline according to the collection of described error microphone and described reference
Signal of change obtains described control signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510512378.4A CN106469551A (en) | 2015-08-19 | 2015-08-19 | A kind of pipeline noise reduction system and method |
| PCT/CN2016/077729 WO2016177203A1 (en) | 2015-08-19 | 2016-03-29 | Pipeline denoising system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510512378.4A CN106469551A (en) | 2015-08-19 | 2015-08-19 | A kind of pipeline noise reduction system and method |
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| CN106469551A true CN106469551A (en) | 2017-03-01 |
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| CN201510512378.4A Pending CN106469551A (en) | 2015-08-19 | 2015-08-19 | A kind of pipeline noise reduction system and method |
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| WO (1) | WO2016177203A1 (en) |
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| CN108428444A (en) * | 2018-03-07 | 2018-08-21 | 南京大学 | A kind of compact active sound-absorption method of compensation secondary sound source Near-field Influence |
| CN108428445A (en) * | 2018-03-15 | 2018-08-21 | 中国科学院声学研究所 | A kind of adaptive active denoising method of error free microphone |
| CN109658915A (en) * | 2019-03-08 | 2019-04-19 | 深兰人工智能芯片研究院（江苏）有限公司 | A kind of noise-reduction method of central air-conditioning, denoising device and central air-conditioning |
| CN110189738A (en) * | 2019-07-09 | 2019-08-30 | 吉林大学 | A kind of device and its noise reduction optimization method for active noise reduction |
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