4 ch Beamforming software system

<System example>




Beam Forming is one of the sound visualization techniques that obtains the sound pressure distribution using the phase differece information from the sound source to the microphone, and makes it visualized with the color map.
This technique requires a lot of microphones to cover a wide area and generally tends to increase the size of the system. By this Beam Forming system, Ono sokki achieved real time sound source visualization with just 4 microphones.

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
"Where does this sound come from?"(YouTube)


Beamforming display example


  • Measurement in wider analysis frequency
  • Sound source searching from 500 Hz to 8 kHz* (*recommended analysis frequency)

  • Visualizing Sound Source using only 4 microphones
  • Finds out the sound source location accurately by new calculation method of BeamForming using merely 4 microphones.

  • Real-time monitoring of sound source (20 times/sec.)
  • 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.

  • Short-distance object measurement by a camera with wider viewing angle
  • 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)




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.



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
*1: When including probe head, main body, grip (not including cables.)
*2: Camera/lenses are not exchangeable.
*3: Using grips/lighting made by other company may affect on the measurement results. Please consult your nearest distributor or Ono Sokki sales office nearby.
*4: Please make the diameter of the hole for wiring (through hole etc.) 30 mm or more as there is a connector part.
*5: Multiple cables are bundled with polyester and nylon.
*6: Used when placing the microphone probe.

* Cable not included

Software (BF-3200/ BF-0310)

BF-3200 BF Monitor

Beam Forming Calculation
Applicable microphone MI-5420A / MI-5420 / MI-6420
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
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
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
*7: Definition of visualization frequency band.
 ・Definition 1: In the free acoustic field, when the distance between the sound source and the microphone is 1 m,
    the spatial resolution until attenuation by - 6 dB from the sound source center is within the wavelength or within 30 cm.
 ・Definition 2: The target scope size can secure 1/3 or more of the camera angle of view.
 ・Also available to analyze the center frequency of 1/3 octave band from 315 Hz to 16 kHz even when it is out of range of the visualization frequency band.
*8: This is the case within the visualization frequency band.
*9: It is different from the beam forming visualization frequency band.
*10: Depending on the play mode, bfm files recorded in ver. 1.3 or later can be played.
*11: OS-2000 series Basic or more, and movie options are required.
*12: For output to the OC-1300 series, OC-1300 ver. 3.6 (sold separately) is required.
*13: For adjustment of frame length, use force window.

Operating environment
Main unit DS-3200*14,*15
Interface USB3.0
Signal output DS-0371 / DS-0372
Remote control DS-0395
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.
*14: The BF-3200 is compatible up to 8 channels. Up to 8 channels are operated even 10 channels or more of unit.
        However, it is not compatible with 100 kHz unit, frame link function.
*15: The BF-3200 is not compatible with DS-2000 series and DS-3100.
*16: USB hub can not be used.
*17: The BF-3200 starts without license key. The BF-0310 requires a license key because it uses the OS-2000 series.
* Windows® XP, Windows® 7 are registered trademarks or trademarks of Microsoft Corporation in the United States and other countries.
* Intel, the Intel logo, Intel Core, Core Inside are trademarks of Intel Corporation in the United States and / or other countries.

Product list

Model name Product name

Sound Source Visualization Probe Microphone*1


BF Monitor


BF Offline Analysis


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

*1 Two kinds of microphone probe head (120 mm, 60 mm), camera, exclusive cable for camera (3 m) and microphone are included.
*2 Video playback software (option) is required.
*3 Required when performing the function equivalent to BPF function of BF monitor by offline analysis.


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).

2 types are provided; 40 kHz unit is good at sound and vibration measurement, and 100 kHz unit has advantages in ultrasonic wave measurement or frequency characteristic measurement.
DS-3000 series covers wide range of measurement in multi-channel even very small signals.

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.

Various types of editing with many kinds of format are available. Not only general formats such as CSV and WAVE data, also original format of each recording device can be edited smoothly. In addition to the video playback function, FFT analysis function, fluctuating sound analysis function and other filter function, also a sound quality evaluation function is available.



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