4ch Beam Forming
Sound Source Visualization System
BF-3200/MI-5420A/BF-0310
<System example>
Real-time monitor software screen of BF-3200
MI-5420A Sound Source Visualization Probe Microphone 60 mm / 120 mm
Click below to watch a video about 4ch Beam Forming
Features
Sound source searching from 500 Hz to 8 kHz* (*recommended analysis frequency)
Finds out the sound source location accurately by new calculation method of BeamForming using merely 4 microphones.
You can monitor the occurring sound in real-time. Having good performance of follow-up, you can visualize various sounds including transient sound as well as stationary sound.
The measurement from close to a target produces less reflection waves and less environmental influences including noise, making it easier to detect the sound and vibration signals. You can grasp sound source position with this system, even in an environment where sound source visualization had been difficult up to now.
Application of Sound Source Visualization System
Measurement system for Sound Source Visualization
Sound Source Visualization system includes the latest FFT Analyzer DS-3200 series Data Station as a measurement unit and Sound Source Visualization Probe Microphone (MI-5420A). BF-3200/BF-0310 and OS-2000 series are used as analysis software.
Examples of measurement
Wide variety of sensor connection allows expanding analysis (up to 8 input channels)
Software
Two kinds of software the Sound Source Visualization System includes
You can select software according to your needs. For basic application including BF-3200 (BF Monitor) is helpful for easy and quick on-site measurement. Adding optional BF-0310 (BF Offline Analysis) allows further analysis by various functions, such as changing number of color map division screens, visualization in narrow band, and smoothing. (OS-2000 series required separately)
BF-3200 BF monitor
BF-0310 BF Offlien Analylsis
Measurement Example
Time Sequence Analysis of Vehicle Door Closing Sound
The sound generated closing a door contains various sounds such as low frequency band sound of 500 Hz or less, latch sound more than 1 kHz etc, and is heard as mixed sound while shifting the timing in 10 ms increments. 4ch Beam Forming System allows the sound source visualization of each sound.
Monitoring the sound in real-time using the BF-3200
By the BF-3200 (BF Monitor), you can monitor the sound source position in real-time, which updating speed is more than 20 fps and be able to follow the sound even for transient sound In this case, you can see the sound source of the door closing sound is shifting in the following order; latch → door surroundings → ground
Further analysis using the BF-0310 Offline Analysis
The recorded data can be analyzed offline by BF-0310. You can grasp the sound source position watching with other analysis results. Time waveform and the result of frequency analysis show that the sound pressure is increased at A and B, from 1 kHz to 2.5 kHz. Performing sound source visualization focusing on these timing and bandwidth, it shows A is latch sound, and B is door hitting sound.
By further analysis to the time and the frequency, you can grasp from where part and which band the sound is generated, even the sound heard as single sound by human ears. 4ch Beam Forming Sound Source Visualization System will help to find the solution, giving some hints to improve the sound quality, such as changing its design etc.
Specification
MI-5420A Sound Source Visualization Probe Microphone
Sound pressure sensitivity | -38 dB ± 3 dB (0 dB = 1 V/Pa, 1 kHz) | |
---|---|---|
Max. sound pressure level | 110 dB (1 kHz, THD= 3 %) | |
Self-noise level | 39 dB (A weighting) | |
Operating temperature range | 0 ℃ to 50 ℃ | |
Operating humidity range | 80 % RH or less (with no condensation) | |
Storage temperature range | -10 ℃ to 60 ℃ | |
Storage humidity range | 90 % RH or less (with no condensation) | |
Weight*1 | 120 mm probe head | Approx. 785 g |
60 mm probe head | Approx. 655 g | |
Applicable standard (CE marking) | EMC Directive 2014/30/EU EN61326-1 RoHS Directive 2011/65/EU EN IEC 63000 |
|
Power source | Supplying method | CCLD |
Voltage | 24 VDC | |
Current | 4 mA/ch | |
Main body | Camera*2 | CMOS USB camera Interface: USB 3.0 Power source: USB bus power |
Composite cable | Screw hole for grip installation | 1/4-20UNC 6mm (on the bottom surface and the back surface:2) |
Screw hole for accessory installation*3 | 1/4-20UNC 6mm (on the top surfacex2) | |
Length | Full length approx. 3 m | |
Diameter | Approx. φ20 mm*4 | |
Minimum bending radius | Approx. 70 mm | |
Covering | Resin mesh sleeve *5 | |
Accessory | Microphone acoustic correction file CD x 1 Microphone position checking plate x 1 Placing platform for camera*6 x 1 BNC cable (0.2 m) x 1 BNC-JPJ adapter x 1 Instruction manual x 1 Carrying case x 1 |
* Cable not included
Software (BF-3200/ BF-0310)
BF-3200 BF Monitor
Beam Forming Calculation | |
Applicable microphone | MI-5420A / MI-5420 / MI-6420 |
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Number of color map display divisions | 41 x 31 (fixed) |
Visualization frequency band*7 | 120 mm probe head: 500 Hz to 4 kHz 60 mm probe head: 1 kHz to 8 kHz |
Visualization frequency setting band | 315 Hz to 16 kHz (1/3 octave band) |
Frame rate*8 | 20 fps or more |
Angle of view used for calculation | Horizontal 78°x Vertical 63°(TYP value) |
Number of pixels used for calculation | 1024×768 |
Window function | Rectangular (fixed) |
FFT monitor | |
Frame length | 40 ms (2048 points: fixed) |
Display frequency band*9 | 250 Hz to 20 kHz |
Recording function*10 | |
Sampling frequency | 51.2 kHz |
Recording frequency range | 20 kHz (fixed) |
A/D conversion | 24 bit (fixed) |
Number of input channels | Max. 8ch For microphone (1 to 4 ch) For general purpose (5 to 8 ch) |
Internal trigger | Setting of slope and level Pretrigger up to 2 seconds |
External sampling | Used for display and recording of rotation speed |
Max. recording time | 600 seconds |
Frame rate for video recording | 25 fps |
Recording file format | bfm file (Ono Sokki original format) |
BF-0310 BF Offline Analysis (Option)*11
Analysis settings | |
Number of display split-screens of color map | 33×25 to 161×121 |
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Frame length | 40 ms (2048 points: fixed) |
Window function | Rectangular / hanning window / force*13 |
Visualization frequency setting band | Every 1/3 octave band Can be customized (specified frequency section) |
Output function | AVI / BMP / CSV / OC-1300 series*12 |
Accessories | |
Installation manual | Instruction on the installation procedure |
BF-3200 / BF-0310 Installation CD |
CD for installation of BF-3200 / BF-0310 software and camera driver |
DS-3200 Installation CD | CD for updating the DS series DSP |
Hardware | |
Main unit | DS-3200*14,*15 |
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Interface | USB3.0 |
Signal output | DS-0371 / DS-0372 |
Remote control | DS-0395 |
PC | |
OS | Microsoft® Windows® 7 Proffesional (64 bit) Microsoft® Windows® 10 Pro (64 bit) (.Net Framework 3.5 Service Pack 1 must be installed.) |
CPU | Intel® CoreTM i7 or more |
Memory | 8 GB or more |
Hard disk | 16 GB or more of capacity |
DirectX | DirectX 9.0c or later (when using BF-0310, OS-0281) |
CD or DVD-ROM drive | For software installation |
Display | Required 1280 x 768 or more |
USB port*16 | USB 3.0 x 2 (camera, DS-3200) USB 2.0 or more×1 (license key)*17 |
Software | For using BF-0310, it requires installation of OS-2000 series ver. 2.10 or higher. |
Product list
Model name | Product name |
---|---|
MI-5420A | Sound Source Visualization Probe Microphone*1 |
BF-3200 | BF Monitor |
BF-0310 | BF Offline Analysis |
DS-3204,DS-0371 | Data Station (4 ch), Signal output (option) |
OS-2720 | OS-2000 series FFT Analysis package |
OS-0281*2 | OS-2000 series Video playback function (option)*2 |
OS-0261*3 | OS-2000 series IIR filter (option)*3 |
Related products
DS-3000 series Data Station
DS-3000 series Data Station is a PC-based FFT Analyzer with high performance and various functions. It succeeds advantages including high speed arithmetic processing, high reliability, good operability which have been accumulated over a long period of time. Real-time analysis capabilities has been improved more than twice compared to the previous model (DS-2000 series).
OS-2000 series Time-series Data Analysis Software
OS-2000 series has received good popularity as software to edit and analyze the long time series data freely which is not used by Excel.
Revised:2019/01/31