CN106777455A - A kind of high-pressure water jet target recognizes microphone array Optimization Design - Google Patents
A kind of high-pressure water jet target recognizes microphone array Optimization Design Download PDFInfo
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- CN106777455A CN106777455A CN201610988443.5A CN201610988443A CN106777455A CN 106777455 A CN106777455 A CN 106777455A CN 201610988443 A CN201610988443 A CN 201610988443A CN 106777455 A CN106777455 A CN 106777455A
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Abstract
The present invention discloses a kind of high-pressure water jet target identification microphone array Optimization Design, the present invention carries out target Detection location using circular arc microphone array, describes the Detection location principle of the circular arc microphone array of the auditory localization principle based on reaching time-difference.Nature imitation experiment device has been built using the type microphone arrays of YG 201, the corresponding data acquisition and procession software using LabVIEW and Matlab software programmings, circular arc microphone array Detection location precision pair and array parameter Optimal Experimental are carried out, the present invention improves the target positioning precision in the detection of high-pressure water jet target.
Description
Technical field
The present invention relates to measuring instrument technical field, specifically a kind of high-pressure water jet target detection identification technology.
Background technology
When high-pressure water jet impacted object under the operating mode of non-cutting, reflected acoustic signal can be produced, unlike material
The reflected sound signals that object is produced are different.Therefore, can be real using the collection and treatment technology of high-pressure water jet combination voice signal
The identification of existing target (such as land mine) and positioning.
The auditory localization technology based on microphone array mainly has three kinds of methods both at home and abroad at present：Side based on Wave beam forming
Method, the method based on High-Resolution Spectral Estimation, the method (TDOA) based on reaching time-difference.Wherein it is based on the positioning of Wave beam forming
Method exist need sound source and ambient noise priori, it is quite sensitive to the selection of initial point, the features such as calculate complicated, because
This is not suitable for being used in real-time system.Localization method requirement based on High-Resolution Spectral Estimation estimates that parameter is immobilized, believed
Number be stationary process, by acoustic reverberation function influence, therefore be also not used to actual location.
Localization method amount of calculation based on reaching time-difference is far smaller than first two, and positioning precision is of a relatively high, does not receive
The limitation of array structure, therefore the present invention is by the use of the method as high-pressure water jet target location algorithm.Conventional at present is transaudient
Device array is linear pattern microphone array and circular arc microphone array, and two kinds of microphone arrays respectively have advantage and disadvantage.In order to expand
Detection area and raising detection efficient, the present invention are detected using linear jet flow array, and jet is realized using microphone array
The Real-time Collection of reflected sound.In order to the accurate identification for realizing target is positioned, can be using the auditory localization based on microphone array
Method is realized.
The content of the invention
Defect it is an object of the invention to be directed to prior art presence, there is provided a kind of high-pressure water jet target identification is transaudient
Device array optimization method for designing.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of high-pressure water jet target recognizes microphone array Optimization Design, and the present invention utilizes circular arc microphone array
Row carry out target Detection location, describe the detection of the circular arc microphone array of the auditory localization principle based on reaching time-difference
Positioning principle.Nature imitation experiment device is built using YG-201 type microphone arrays, using LabVIEW and Matlab software programmings
Corresponding data acquisition and procession software, has carried out circular arc microphone array Detection location precision pair and array parameter optimization
Experiment.Test result indicate that, circular arc type microphone array is to the positioning precision (9.03mm) of high-pressure water jet target far above straight
The positioning precision (88.89mm) of line style microphone, the adjacent optimum distance of each microphone is 200mm, and corresponding optimal angle of circumference is
30°。
Beneficial effects of the present invention：
1st, the present invention improves the target positioning precision in the detection of high-pressure water jet target.
Brief description of the drawings
Fig. 1 is microphone array schematic diagram of the present invention.
Specific embodiment
The present invention is described in further detail with reference to specific embodiment.
As shown in figure 1, a kind of high-pressure water jet target identification microphone array Optimization Design, camber microphone array
Middle microphone is uniformly being distributed on a circular arc, is evenly distributed on 3 points of circular arc O, A, B by three microphones, middle biography
Sound device as rectangular coordinate system origin, both sides such as are uniformly distributed at the microphone of quantity.
Wherein P is the position of sound source, and ∠ BOx are α, are the angle of two adjacent microphone lines and x-axis positive axis, and α takes
Different values represents the circular arc of different-diameter.∠ POx are the angle of θ, i.e. sound source, middle microphone line and x-axis positive axis.m
It is two distances of adjacent microphone, m and α is the parameter of microphone array.R is the distance of sound source and intermediate sensor, obtains R
Sound source position in a coordinate system can be drawn with the value of θ.Following relationship can be drawn according to geometrical relationship：
Wherein, distance of the m------ both sides microphone away from middle microphone；
τ1The time difference of --- ----the right microphone and middle microphone；
τ-1The time difference of --- ----left side microphone and middle microphone.
From above two microphone array positioning principle, sound source to the time delay of each microphone is calculated, can
So that the position of sound source can be drawn according to Time Delay Estimation Method, therefore the time difference between each microphone is accurately calculated for accurate
Estimate that source of students position is extremely important.
Broad sense correlation time-delay estimate method (GCC) is a kind of classical delay time estimation method.It is by setting up two biographies
Cross-correlation function between the signal that sound device is received, takes its peak to obtain time delay estimation[8].Two microphones are received
Signal between cross-correlation function R0i(τ) can be expressed as follows：
R0i(τ)=E [x0(t)xi(t-τ)]
E () represents mathematic expectaion, x in formula0(t) and xi(t- τ) represent respectively marked as 0 and i sensor in t
The target reflected sound signals for collecting, τ is the time delay between two signals.
Because the corresponding high-pressure water jet reflected sound of different targets is different, therefore can be to the signal of each microphone pick
Processed, the signal for extracting reflection target carries out cross-correlation function computing, and then calculates the τ in formula, you can obtain certain
The time difference that target reflected sound is transferred between two microphones is planted, and then judges the position of sound source (target).
The present invention uses YG-201 type microphone arrays, with reference to the LabVIEW softwares and USB6229 capture cards of NI companies,
High-pressure water jet target reflected sound data acquisition and target location simulation experimental system are built, by microphone array, data acquisition
Card, signal conditioner and computer composition.Data acquisition and procession software is programmed using LabVIEW and Matlab language,
Carry out the location simulation experiment of sound source.Because High pressure water jet nozzle array is in further improvement is improved, uses put herein
Can tap and send the target that the object simulation high-pressure water jet of sound is detected, using the speech simulation target for tapping object generation
Thing reflected sound, being placed in microphone array opposite diverse location carries out target analog simulation positioning experiment.During experiment, change circular arc
The relevant parameter of shape microphone array, sets up various sizes of microphone array and is tested.It is anti-according to high-pressure water jet target
The frequency range of sound is penetrated, this experimental provision data sampling frequency is 50KHz.
The signal transacting and target finder of above-mentioned microphone array collection are worked out using LabVIEW, wherein two
Time difference between microphone is obtained using the index extracted at the cross-correlation function signal maximum being calculated, Jin Erke
According to formula (1)-(4), position of the target (sound source) in two kinds of microphone arrays and detection coordinate system is calculated respectively.
When being tested using circular arc type microphone array, also fit using three microphone composition microphone arrays.It is adjacent
The spacing of microphone takes 150mm, 200mm, 250mm, 300mm respectively, and corresponding angle of circumference takes 30 °, 45 °, 60 °, composition respectively
12 groups of different circular arc type microphone arrays are tested, the experimental result processed using data processing software.
Claims (3)
1. a kind of high-pressure water jet target recognizes microphone array Optimization Design, and microphone is uniform in camber microphone array
It is being distributed on a circular arc, is being evenly distributed on 3 points of circular arc O, A, B by three microphones, middle microphone is used as right angle
The origin of coordinate system, both sides such as are uniformly distributed at the microphone of quantity.
Wherein P is the position of sound source, and ∠ BOx are α, are the angle of two adjacent microphone lines and x-axis positive axis, and α takes difference
Value represent the circular arc of different-diameter.∠ POx are the angle of θ, i.e. sound source, middle microphone line and x-axis positive axis.M is two
The distance of individual adjacent microphone, m and α is the parameter of microphone array.R is the distance of sound source and intermediate sensor, obtains R and θ
Value can draw sound source position in a coordinate system.Following relationship can be drawn according to geometrical relationship：
Wherein, distance of the m------ both sides microphone away from middle microphone；
τ1The time difference of --- ----the right microphone and middle microphone；
τ-1The time difference of --- ----left side microphone and middle microphone.
From above two microphone array positioning principle, sound source to the time delay of each microphone is calculated, can be with root
The position of sound source can be drawn according to Time Delay Estimation Method, therefore accurately calculates the time difference between each microphone for accurate estimation
Source of students position is extremely important.
Broad sense correlation time-delay estimate method (GCC) is a kind of classical delay time estimation method.It is by setting up two microphones
Cross-correlation function between the signal for receiving, takes its peak to obtain time delay estimation.The signal that two microphones are received
Between cross-correlation function R0i(τ) can be expressed as follows：
R0i(τ)=E [x0(t)xi(t-τ)]
E () represents mathematic expectaion, x in formula0(t) and xi(t- τ) is represented respectively marked as 0 and the sensor of i is gathered in t
The target reflected sound signals for arriving, τ is the time delay between two signals.
Because the corresponding high-pressure water jet reflected sound of different targets is different, therefore the signal of each microphone pick can be carried out
Treatment, the signal for extracting reflection target carries out cross-correlation function computing, and then calculates the τ in formula, you can obtain certain target
Thing reflected sound is transferred to the time difference between two microphones, and then judges the position of sound source (target).
2. a kind of high-pressure water jet target identification microphone array Optimization Design according to claim 1 uses YG-
201 type microphone arrays, with reference to the LabVIEW softwares and USB6229 capture cards of NI companies, build the reflection of high-pressure water jet target
Sound data acquisition and target location simulation experimental system, by microphone array, data collecting card, signal conditioner and calculating unit
Into.Data acquisition and procession software is programmed using LabVIEW and Matlab language, carries out the location simulation experiment of sound source.
Because High pressure water jet nozzle array is in further improvement is improved, using to put herein can tap the object mould for sending sound
Intend the target that high-pressure water jet is detected, using the speech simulation target reflected sound for tapping object generation, be placed in microphone array
Row opposite diverse location carries out target analog simulation positioning experiment.During experiment, change the relevant parameter of circular arc microphone array,
Various sizes of microphone array is set up to be tested.According to the frequency range of high-pressure water jet target reflected sound, this experiment dress
Data sampling frequency is put for 50KHz.
3. a kind of high-pressure water jet target according to claim 1 recognizes microphone array Optimization Design, microphone
The signal transacting and target finder of array acquisition are worked out using LabVIEW, wherein the time difference between two microphones
Obtained using the index extracted at the cross-correlation function signal maximum being calculated, so can according to formula (1)-(4),
Position of the target (sound source) in two kinds of microphone arrays and detection coordinate system is calculated respectively.
When being tested using circular arc type microphone array, also fit using three microphone composition microphone arrays.It is adjacent transaudient
The spacing of device takes 150mm, 200mm, 250mm, 300mm respectively, and corresponding angle of circumference takes 30 °, 45 °, 60 ° respectively, constitutes 12 groups
Different circular arc type microphone arrays are tested, the experimental result processed using data processing software.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050265562A1 (en) * | 2002-08-26 | 2005-12-01 | Microsoft Corporation | System and process for locating a speaker using 360 degree sound source localization |
| CN103278047A (en) * | 2013-05-24 | 2013-09-04 | 安徽理工大学 | Device and method for detecting materials and shapes of landmines through high-pressure water jet reflected sound |
-
2016
- 2016-11-09 CN CN201610988443.5A patent/CN106777455A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050265562A1 (en) * | 2002-08-26 | 2005-12-01 | Microsoft Corporation | System and process for locating a speaker using 360 degree sound source localization |
| CN103278047A (en) * | 2013-05-24 | 2013-09-04 | 安徽理工大学 | Device and method for detecting materials and shapes of landmines through high-pressure water jet reflected sound |
Non-Patent Citations (2)
| Title |
|---|
| B.YEGNANARAYANA 等: "Processing of reverberant speech for time-delay estimation", 《IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING》 * |
| 陈颖 等: "基于麦克风阵列的声源定位算法研究及DSP实现", 《燕山大学学报》 * |
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Application publication date: 20170531 |