LMS声源定位技术_All

LMS声源定位技术
Dr. Wei Chen, LMS China, Shanghai office 1 LMS Sound Source Localization Techniques

Sound sources localization
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技术介绍
产品介绍
3
应用实例
4
发展方向
2 LMS Sound Source Localization Techniques

Challenges
To locate a maximum number of sound sources : To have the best spatial resolution to separate the sources To quantify each source power (sufficient dynamic range) To minimize the cost of measurements : In time In material Cover a wide range of applications
3 LMS Sound Source Localization Techniques

Sound Source Localization Techniques at LMS
Acoustic Intensity 声强 Beam-Forming 波束成形 Near Field Focalization 近场聚焦 Acoustic Holography 声全息 Airborne Source Quantification 传递路径分析 3D 3D Result
Sound Source Result
3D 2D Result
3D 3D Result
3D 3D Result
3D 3D Result
Distance to source
Not determined
Far > 0.5 m
Near < λ
Ideal < λ
Not relevant
Measurement Result
Intensity
Pressure
Intensity
Sound Power, Intensity, Velocity
Source Strength
Environment
Far-field (ISO 9614)
Free Field
Free Field Near Field
Free Field Near Field
Operational Field
Spatial Resolution
Low
Low
High
High
High
What if Games
No
No
No
Yes No for Pass-by
Yes
Stationary
Stationary/ Transient
Stationary/ Transient
Stationary/ Transient
Stationary/ Transient
4 LMS Sound Source Localization Techniques

Acoustic Intensity （声强技术）
优点：Positive Supported by ISO/ANSI standards Widely accepted and used in industry 2 applications: Sound Power Measurements (ISO9614) and Source Ranking 缺点：Negative expensive intensity probe measurements normally in far-field (low spatial resolution) 详见声强文件
5 LMS Sound Source Localization Techniques

BeamForming Technique（波束成形技术）
Any kind of grid of pressure acquisition optimization of the antenna (dist. From sources ≥ diameter of antenna)
⇒
Summation of pressures with phase delays (planar waves) ri p t ( − ∑ i c) Any kind of surface for both acquisition and computation No power estimates Surface can be smaller than object
6 LMS Sound Source Localization Techniques

BeamForming Technique（波束成形技术）
优点：Positive Spatial Technique Inexpensive microphones Sound Mapping tool for verification measurement 缺点：Negative Does not take evanescent waves into account (far field technique) Cannot be used for real analysis (real place of unknown sources cannot be pinpointed) measurements normally in far-field (low spatial resolution) No meaningful ‘What if’ games
7 LMS Sound Source Localization Techniques