CN106706115A - Real-time noise monitoring system - Google Patents
Real-time noise monitoring system Download PDFInfo
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- CN106706115A CN106706115A CN201611018577.0A CN201611018577A CN106706115A CN 106706115 A CN106706115 A CN 106706115A CN 201611018577 A CN201611018577 A CN 201611018577A CN 106706115 A CN106706115 A CN 106706115A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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- Evolutionary Computation (AREA)
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- General Engineering & Computer Science (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention relates to a real-time noise monitoring system. The real-time noise monitoring system is characterized by comprising a sound signal acquisition unit built in or connected with a PC, a sound signal processing unit operating in the PC, a self-contained display unit of the PC, and a self-contained storage unit of the PC. The real-time noise monitoring system is advantaged in that 1, multi-subject intersection of the computer technology, the detection technology and signal processing and safety management technologies is realized, and relatively good application flexibility and repeatability are realized; 2, the real-time noise monitoring system can be applied to safety management after proper expansion, application of a control system based on the virtual apparatus technology is made to be safer and more reliable.
Description
Technical field
The present invention relates to a kind of system of real-time monitoring noise.
Background technology
Completed using sound level meter mostly in environment noise monitoring at present, sound level meter be it is a kind of according to certain frequency weighted and
The instrument of time weighted measurement sound pressure level and sound level.It is the most frequently used instrument in acoustic measurement, can man-made noise, hand over
Logical noise, ambient noise and domestic noise etc., the instrument of its noise level is approx determined by human hearing characteristic.Sound level meter can be with
It is applied to the measurement such as ambient noise, electronic product noise, traffic noise, architectural acoustics and electroacoustics.
Sound level meter is as some expensive and narrower metrical instruments of application surface, it is necessary to external or incorporating filter composition, uses
In carrying out spectrum analysis, and substantially using the digital circuit of traditional instrument.Existing product is mostly unit hand portable equipment,
Can not meet for test equipment networking, intelligentized trend.
The content of the invention
The purpose of the present invention is that the real-time monitoring of noise is realized using separate unit PC.
In order to achieve the above object, the technical scheme is that providing a kind of noise real-time monitoring system, its feature
It is, including：
The built-in sound card of PC or the sound signal collecting unit being connected with PC, simultaneously will collection for collected sound signal
To voice signal be converted to digital audio signal；
The sound signal processing circuit of PC is run on, for analyzing the digital audio signal for obtaining, noise decibel is calculated
The dominant frequency of value and noise, differentiates theoretical, Analyze noise grade further according to noise；
The display that PC is carried, for the analysis result of display sound signal processing circuit in real time；
The memory that PC is carried, for storing digital audio signal and sound corresponding with digital audio signal letter
The analysis result of number processing unit.
Preferably, the sound signal collecting unit includes sound signal collecting hardware module and sound signal collecting software
Module, wherein, sound signal collecting hardware module includes the built-in sound card of PC and with or with the collecting devices that are connected of PC, sound
Signal acquisition software module is designed using LabVIEW platform and realized, specific gatherer process is：
Sound Input Configure.vi are configured to sound card in calling LabVIEW, configure the port number of sound card
It is 2, sound can be sampled using limited sampling pattern or continuous sampling pattern.
Preferably, the continuous sampling pattern is comprised the following steps：
After configuration function VI, into circulation, the AD of sound card is ceaselessly read by calling Sound Inputread.vi
The sampled value of data, until clicking on stop button, jumps out circulation, Sound Input Stop.vi is performed, so as to stop noise number
According to collection, terminate collection, subsequently into Sound Input clear.vi, discharge sound card resource, release the occupancy to sound card.
Preferably, the sound signal processing circuit is comprised the following steps using LabVIEW realizations：
The passage selected in setting in analysis sound card, is extracted the data of the passage by array of indexes, then
Amplitude and Levels (obs) .vi is called to obtain the amplitude of signal, because signal is made up of positive and negative data, by exhausted
The amplitude of signal is obtained by value function, noise level is measured by the amplitude information of signal, then by logarithmic function simultaneously
It is multiplied by the 20 acoustic pressure DBMSs for changing into decibel units；
Meanwhile, the frequency information to noise is analyzed, and calls Extract single tone infomation.vi,
Obtain the dominant frequency of current Real-time Collection noise, the frequency response information of the information response sound, the frequency response information major embodiment noise
The acuity of sound, frequency more high sound is more sharp.
Present design is commented using the virtual instrument technique based on PC, the influence of noise system to sound in environment
Estimate.And most of noise-measuring instruments are all special instruments at present, single machine test work.And the design is by powerful PC, can be with
The system design scheme for realizing signal acquisition, analysis and interpretation of result is given by software on PC, and is easy to using the network of PC
Change technology, provides association system monitoring scheme.
The advantage of the invention is that：1st, it is the multi-disciplinary friendship such as computer, detection technique, signal transacting and safety management
Fork, the flexibility that system is used, favorable repeatability；2 thinkings can be widely applied to the peace of monitoring system by appropriate extension
Full management, make the control system based on virtual instrument technique uses energy safety and reliability.
Brief description of the drawings
Fig. 1 is the structure composition schematic diagram of noise real-time monitoring system of the invention；
Fig. 2 is signal acquisition program flow diagram；
Fig. 3 is sound signal processing program flow diagram；
Fig. 4 is original sound data Stored Procedure figure；
Fig. 5 is analysis information Store flow chart.
Specific embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content for having read instruction of the present invention, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
As shown in figure 1, a kind of noise real-time monitoring system that the present invention is provided, including signal gathering unit, voice signal
Processing unit, monitoring result display unit and memory cell, four parts constitute.
On the Software Development Platform of LabVIEW, whole program uses the structure of sequence frames to the present invention, and the first frame is mainly complete
Into variable initializer show, the second frame waiting for the start collection button is pressed, and noise data is acquired after pressing, and the 3rd frame is main
Complete collection, noise analysis and the preservation of noise data of noise data.
The step of signal gathering unit realizes signal acquisition includes：
Sound Input Configure.vi are configured to sound card in calling LabVIEW first, and major parameter includes
Audio format, sampling configuration and every channel sample number etc..Audio format sets the acquisition rate of sound operation, number of channels and every
The digit of individual sampling, the sound card that value is matched depending on PC.General sound card has two passages, and this local collocation channel number is 2, is matched somebody with somebody
Put the reason for passage is 2 is that general sound card is stereo.Sampling configuration is divided into limited sampling and continuous sampling, selects continuous here
Sampling, can repeatedly call and " read sound to be input into as needed.Hits in per channel sample number appointed buffer per passage
Amount, needs continuous sampling then to use larger number of samples.After configuration function VI, into while circulations, by calling
Sound Input read.vi ceaselessly read the sampled value of the AD data of sound card, and until we click on stop button, program is jumped
Go out circulation, perform Sound Input Stop.vi, so as to stop the collection of noise data, terminate collection, subsequently into Sound
Input clear.vi, discharge sound card resource, release the occupancy to sound card.
Sound signal processing circuit is mainly the noise data of Real-time Collection is analyzed, and the content of analysis mainly includes
The calculating of noise decibel and the calculating of the dominant frequency of noise.The data of analysis we using sound DAQ double-channel data wherein one
It is individual, because the data of double channels acquisition are the same, so analyze one of passage, by array of indexes by first passage
Data extract, then call Amplitude and Levels (obs) .vi to obtain the amplitude of signal because signal by
Positive and negative data composition, is obtained the amplitude of signal by ABS function, then by logarithmic function and is multiplied by 20 conversion compositions
The acoustic pressure DBMS of shellfish unit.Because the size of noise can be reacted by the amplitude of signal, so we can be by letter
Number amplitude information measure noise level.While Analyze noise level, we have also been carried out point to the frequency information of noise
Analysis, the part have invoked Extract single tone infomation.vi, obtain the dominant frequency of current Real-time Collection noise,
The frequency response information of the information response sound.The acuity of the sound of the information major embodiment noise, frequency more loud noise is more
Sharply.
Memory cell is divided into the preservation of original sound data and the preservation of analyze data.The storage of data is firstly the need of us
File is deposited in certain position of hard disk, so first create the file of storage data file.The mode of establishment file folder, adopts
Created with path where current vi, detection data file first whether there is, if there is no being created that.Original sound
The preservation file format of data is .wav, and the data file of general sound is all preserved with .wav forms.And file is with the sound
The system time that sound is acquired is named, and the benefit named with system time is that the data for preserving are not easy covering, because often
The time of secondary operation program is all different.Then in the data file path for creating, wav files are opened, subsequently into while
Circulation, the preservation of data is write by calling Sound File Write.vi, the part be with Real-time Collection it is synchronous, also
It is while saying analysis, i.e., preservation operation to be carried out to data.When stop button is clicked on, terminate while circulations, by adjusting
File is closed with Sound File Close.vi.
The preservation of analyze data is entered decibel information and dominant frequency information of analysis etc. by shift register in memory cell
Row is preserved, and the effect of shift register is temporary transient data storage, when stopping is clicked on, total data is saved in into analysis number
According in file, the form of data file .txt is stored.The save location of file is consistent with the save location of voice data,
The name of file is consistent with the name of the corresponding audio files of the data.The benefit of the naming method can allow people very clear
The relation of analyze data and original sound.
Monitoring result display unit arranges oscillograph, display control etc. on the display of PC by sound by front panel
Noise analysis result presentation out.Wherein, including voice signal show in real time, voice signal frequency, voice signal amplitude, language
The contents such as sound signal phase, the decibel value of current sound and noise diagnostics result are interface is clear, succinct.
Noise monitoring system design of the invention, completes the input of signal and result shows by PC sound cards and display,
The analyzing and processing work to signal is realized by software mode by LabVIEW development and application programs on PC simultaneously, monitoring is completed
The most work of system, the program of completion is made up of the above.
Claims (4)
1. a kind of noise real-time monitoring system, it is characterised in that including：
PC is built-in or sound signal collecting unit that be connected with PC, for collected sound signal and the sound that will collect
Signal is converted to digital audio signal；
The sound signal processing circuit of PC is run on, for analyzing the digital audio signal for obtaining, noise decibel is calculated and is made an uproar
The dominant frequency of sound, differentiates theoretical, Analyze noise grade further according to noise；
The display unit that PC is carried, for the analysis result of display sound signal processing circuit in real time；
The memory cell that PC is carried, for storing digital audio signal and voice signal corresponding with the digital audio signal
The analysis result of processing unit.
2. a kind of noise real-time monitoring system as claimed in claim 1, it is characterised in that the sound signal collecting unit bag
Sound signal collecting hardware module and sound signal collecting software module are included, wherein, sound signal collecting hardware module includes PC
The built-in sound card of machine and the collecting device being connected with sound card, sound signal collecting software module are realized using LabVIEW, specifically adopted
Collection process is：
Sound Input Configure.vi are configured to sound card in calling LabVIEW, and the port number for configuring sound card is 2,
Sound is sampled using limited sampling pattern or continuous sampling pattern.
3. a kind of noise real-time monitoring system as claimed in claim 2, it is characterised in that the continuous sampling pattern include with
Lower step：
After configuration function VI, into circulation, the AD data of sound card are ceaselessly read by calling Sound Input read.vi
Sampled value, until clicking on stop button, jump out circulation, execution Sound Input Stop.vi, so as to stop noise data
Collection, terminates collection, subsequently into Sound Input clear.vi, discharges sound card resource, releases the occupancy to sound card.
4. a kind of noise real-time monitoring system as claimed in claim 2, it is characterised in that the sound signal processing circuit is adopted
Realized with LabVIEW, comprised the following steps：
Any one passage in analysis sound card, is extracted the data of the passage by array of indexes, is then called
Amplitude and Levels (obs) .vi obtains the amplitude of signal, because signal is made up of positive and negative data, by absolute value
Function obtains the amplitude of signal, and noise level is measured by the amplitude information of signal, then by logarithmic function and is multiplied by
The 20 acoustic pressure DBMSs for changing into decibel units；
Meanwhile, the frequency information to noise is analyzed, and calls Extract single tone infomation.vi, obtains
The dominant frequency of current Real-time Collection noise, the frequency response information of the information response sound, the sound of the frequency response information major embodiment noise
Acuity, frequency more high sound is more sharp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611018577.0A CN106706115A (en) | 2016-11-18 | 2016-11-18 | Real-time noise monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611018577.0A CN106706115A (en) | 2016-11-18 | 2016-11-18 | Real-time noise monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107515188A (en) * | 2017-07-24 | 2017-12-26 | 哈尔滨工程大学 | A kind of seabed Corrosion monitoring instrument operating system based on LABVIEW softwares |
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| CN202420664U (en) * | 2011-12-29 | 2012-09-05 | 东北石油大学 | Automatic ambient noise monitor |
| CN105258792A (en) * | 2015-10-29 | 2016-01-20 | 广西盛业建筑节能技术股份有限公司 | Stationing type environmental noise analytic system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012262A (en) * | 2010-10-21 | 2011-04-13 | 浙江吉利汽车研究院有限公司 | Engine exhaust noise signal acquisition system |
| CN202420664U (en) * | 2011-12-29 | 2012-09-05 | 东北石油大学 | Automatic ambient noise monitor |
| CN105258792A (en) * | 2015-10-29 | 2016-01-20 | 广西盛业建筑节能技术股份有限公司 | Stationing type environmental noise analytic system |
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| CN107515188A (en) * | 2017-07-24 | 2017-12-26 | 哈尔滨工程大学 | A kind of seabed Corrosion monitoring instrument operating system based on LABVIEW softwares |
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