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4ch beamforming sound source visualization system
Rental only (sales ended)
BF-3200/MI-5420A/BF-0310

Example of system configuration

The 4 ch beamforming sound source visualization system is a method that visualizes sound pressure distribution using phase difference information from the sound source to the microphone, displayed in a color map. In beamforming, to adapt to a wider range of sounds, it is common to use dozens or even hundreds of microphones, which tends to increase the size. Our "4 ch beamforming" system achieves real-time sound visualization with just four microphones.

* The sound source visualization system (BF-3200 / MI-5420A / BF-0310) has been discontinued. The 4ch beamforming sound source visualization system is available as a rental product. Please contact your nearest sales office.

  • BF-3200 BF monitor real-time monitoring screen
    BF-3200 BF monitor real-time monitoring screen
  • Audio Visualization Microphone Probe MI-5420 A60 mm / 120 mm
    Audio visualization microphone probe MI-5420
    A60 mm / 120 mm

Introduction video "Where is this sound coming from?" (YouTube)

  • Examples of Visualization

Features

  • Achieving measurements over a wide analysis frequency
     Analysis frequency 500 Hz to 8 kHz※sound source exploration is possible.
    ※Recommended analysis frequency 

  • Possible to detect sound sources with 4 microphones
    By using a new method for beamforming calculations, it accurately captures sound source locations even with fewer microphones.

  • Real-time monitoring of sound source conditions (over 20 times/second)
    Due to the good tracking of sound source positions, visualization is possible regardless of steady-state or transient sounds.

  • Wide-angle measurement enables close-range measurement
     Close-range measurement reduces reflection waves and environmental influences, making it easier to secure S/N.
    It will be possible to grasp the sound source position even in environments where sound source visualization has been difficult until now. 

system configuration

  • system configuration

The measurement unit consists of a system based on the DS-3200 Data Station combined with the MI-5420A Sound Source Visualization Microphone Probe, using two types of microphones (120 mm and 60 mm) that are swapped depending on the analysis frequency. Four channels of the Data Station are used to connect the sound source visualization microphone probe. By adding four more channels, it is possible to connect an Accelerometer or rotation sensor to perform monitoring while checking vibration waveforms and rotation speeds. For measurement and analysis, 4-channel beamforming software (BF-3200/BF-0310) and the time-series data analysis tool OS-2000 series are used.

Measurement combined with other sensors (example of expansion)

In addition to the audio visualization microphone probe (using 4 channels), it is possible to input other sensors (up to 8 channels), enabling multifaceted analysis.

bf3200_systemkousei

Software Configuration

Two software that make up the audio visualization system.

Software can be selected according to your objectives. The BF-3200 (BF Monitor) is the basic package and is ideal for speedy problem-solving in the field. Furthermore, adding the optional BF-0310 (BF Offline Analysis) enables detailed analysis with convenient features such as changing the number of color map display divisions, visualization in narrowband, and smoothing. (A separate OS-2000 series is required.)

  • BF-3200 BF Monitor

    BF-3200 BF Monitor

  • BF-0310 BF Offline Analysis

    BF-0310 BF Offline Analysis

Measurement Examples

the sound of a car door closing

The sound generated when the door closes can be heard mixed with sounds such as latch sounds above 1 kHz, in addition to low frequency sounds below 500 Hz, with a timing shift of 10 ms. Each sound's origin can be visualized using a 4-channel beamforming sound source visualization system.

With the BF-3200, you can monitor the sound source location in real time. The drawing speed is over 20 fps, allowing it to follow transient sounds. In the case of the door closing sound, you can confirm the order of latch → around the door ⇒ ground.

Offline analysis of recorded data is performed using the OS-2000 series. Since the BF-0310 is software plugged into the OS-2000 series, it is possible to identify sound source locations while integrating other analysis results. Based on the time waveform and frequency analysis results in the figure below, the sound pressure increases in the 1 kHz to 2.5 kHz band at timings A and B. By focusing on these timings and frequency bands for sound source visualization, it becomes clear that A is the latch sound and B is the door impact sound.

  • Sound of a car door closing No.1
  • Sound of a car door closing No.2
  • A latch sound
  • B door impact sound

Sounds that are perceived as a single entity by the human ear can be understood in detail through time and frequency analysis, allowing us to identify from which parts and frequency ranges sounds are generated at specific timings. This can provide hints on which components to redesign for sound quality improvement, contributing to a reduction in the time required for the improvement process.

Specifications

MI-5420A Sound Source Visualization Microphone Probe

sound pressure sensitivity -38 dB ±3 dB　（0 dB = 1 V/Pa、1 kHz）
Maximum Sound Pressure Level 110 dB（1 kHz、THD = 3 %）
Self-Noise Level 39 dB (A-weighted)
Operating temperature range 0 ℃～50 ℃
Operating Humidity Range Below 80% RH (without condensation)
Storage Temperature Range -10 °C to 60 °C
Storage Humidity Range Below 90% relative humidity (without condensation)
Mass ※1 120 mm probe head available. 約785 g
Has a 60 mm probe head. 約655 g
Conformity to standards (CE marking) EMC Directive 2014/30/EU Standard EN61326-1
RoHS Directive 2011/65/EU Standard EN IEC 63000
Power Supply supply method CCLD
voltage DC 24 V
electric current 4 mA/ch
main body Camera ※2 CMOS USB camera
Interface: USB3.0
Power: USB bus power
composite cable Screw hole for grip installation 1/4-20UNC 6 mm (two places at the bottom and back)
Accessory mounting screw hole ※3 1/4-20UNC 6 mm (2 places on the top)
Length approximately 3 meters in length
thickness Approximately ⌀20 mm ※4
minimum bending radius Resin mesh sleeve ※5
Accessories Microphone acoustic correction file CD x 1
Microphone position confirmation plate x 1
Main body stand *6 x 1
BNC cable (0.2 m) x 1
BNC-JPJ adapter x 1
Instruction manual x 1
Carrying case x 1

*1 Includes probe head, main body, and grip (excluding cable).
*2 Camera and lens cannot be exchanged.
*3 Using third-party grips or lighting may affect measurement results.
*4 When passing through holes, there is a connector part, so please ensure the hole is ⌀30 mm or larger.
*5 Multiple cables are bundled with polyester and nylon.
*6 Used when placing the microphone probe.

Software Specifications (BF-3200 / BF-0310)

BF-3200 BF Monitor

Beamforming calculation
Compatible Microphone Probe MI-5420A / MI-5420 / MI-6420
Number of divisions in color map display 41×31 (fixed)
Visible frequency band ※7 120 mm probe head
500 Hz to 4 kHz
60 mm probe head
1 kHz to 8 kHz
Visualization of frequency setting bandwidth 315 Hz to 16 kHz (per 1/3 octave band)
Frame rate ※8 more than 20 fps
Calculation of the angle of view Horizontal 78° × Vertical 63° (Typical value)
number of pixels used in calculations 1024×768
window function Rectangular (fixed)
FFT Monitor
frame length 40 ms (2048 points fixed)
Display frequency band ※9 250 Hz～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 Up to 8 ch
Audio visualization microphone 1 to 4 ch
Universal input 5 to 8 ch
internal trigger Slope and level setting
up to pre-trigger 2 seconds
External Sampling Display and recording of rotational speed.
maximum recording time 600 seconds
video recording frame rate 25 fps
Recording file format bfm file (Ono Sokki proprietary format)

BF-0310 BF Offline Analysis (Optional) ※11

Analysis settings
Number of divisions in color map display 33×25～161×121
frame length 40 ms (2048 points fixed)
window function Rectangular / Hanning / Force *13
Visual frequency band settings 1/3 octave band every
custom (optional frequency range)
output function AVI / BMP / CSV / O-Chart※12
Accessories
Installation Manual Installation instructions and manual
BF-3200 / BF-0310
Installation CD		 BF-3200 / BF-0310 Software and Camera Driver Installation CD
DS-3200 Installation CD CD for updating the DSP of the DS series.

*7 Definition of visualization frequency band
・Definition 1 In a free field, when the distance between the sound source and the microphone is 1 m, the spatial resolution until attenuation of -6 dB from the center of the sound source must be within the wavelength or within 30 cm.
・Definition 2 The target scope size must be at least 1/3 of the camera's angle of view.
・Analysis is possible for 1/3 octave band center frequencies from 315 Hz to 16 kHz, even outside the visualization frequency band range.
*8 This applies when within the visualization frequency band.
*9 This differs from the beamforming visualization frequency band.
*10 Depending on the play mode, playback of bfm files recorded with Ver1.3 or later is possible.
*11 OS-2000 series Basic or higher, and the video option are required.
*12 When exporting to OC-1300 series, the separately sold OC-1300 series Ver3.6 is required.
*13 Adjust the frame length using the force window.

operating environment

hardware
main unit DS-3200※14, ※15
interface USB3.0
signal output DS-0371 / DS-0372
remote control DS-0395
PC
OS Microsoft ® Windows ® 7 Professional (64-bit version
Microsoft ® Windows ® 10 Pro (64-bit version)
(.NET Framework 3.5 Service Pack 1 must be installed)
For details on the version, please refer to Software Environment 【Windows】.
CPU Intel ® Core TM i7 equivalent or higher
Memory more than 8GB
Hard disk 16GB or more of free space
DirectX Since DirectX 9.0c (when using BF-0310, OS-0281)
CD or DVD-ROM drive for software installation
Display Something that can display at 1280×768 or higher.
USB port ※16 USB 3.0×2 (Camera, DS-3200
USB 2.0 or higher ×1 (License key) ※17
Software When using BF-0310,
OS-2000 series ver 2.10 or higher must be installed

*14 BF-3200 supports up to 8 channels. It can operate using up to 8 channels even with units of 10 channels or more. However, it does not support 100 kHz units or the frame link function.
*15 BF-3200 is not compatible with the DS-2000 series or DS-3100. (BF-3100 was compatible)
*16 USB hubs cannot be used.
*17 BF-3200 starts without a license key. BF-0310 requires a license key because it uses the OS-2000 series.

*Windows® XP and Windows® 7 are registered trademarks or trademarks of Microsoft Corporation in the United States and other countries.
*Intel, Intel, the Intel logo, Intel Core, and Core Inside are trademarks of Intel Corporation in the United States and/or other countries.

Price

Example of Configuration (Full System)

Model name Product Name Price
MI-5420A Audio visualization microphone probe *1 - Sold Out -
BF-3200 BF Monitor - Sold Out -
BF-0310 BF Offline Analysis - Sold Out -
DS-3204、DS-0371 Data station (4 ch), signal output option - Sold Out -
OS-2720 OS-2000 series FFT Analysis Pack - Sold Out -
OS-0281*2 OS-2000 series Video Playback Option - Sold Out -
OS-0261*3 IIR filter option - Sold Out -

Example configuration: BF monitor only.

Model name Product Name Price
MI-5420A Audio visualization microphone probe *1 - Sold Out -
BF-3200 BF Monitor - Sold Out -
DS-3204、DS-0371 Data station (4 ch), signal output option - Sold Out -

*1 Includes two types of microphone probe heads (120 mm, 60 mm), a camera, and a dedicated 3 m camera-microphone combination cable
*2 Video playback option is required
*3 Required if performing functions equivalent to the BPF function of the BF monitor in offline analysis

Related products

DS-3000 Data Station

DS-3000 Data Station

The DS-3000 series Data Station is a PC-based high-performance, high-functionality FFT analyzer. While inheriting the high-speed computational capabilities, high reliability, and user-friendly operability developed so far, it has further accelerated the computational speed, enhancing real-time analysis capabilities to more than double that of the previous model (DS-2000 series).
We have lined up two types of units: a 40 kHz unit that excels in acoustic and vibration measurement, and a 100 kHz unit that specializes in ultrasonic measurements and frequency characteristic measurements. This allows for the simultaneous measurement of fine signals that were difficult to measure until now, across a wide frequency range.

　
Data Station DS-3000 series
OS-2000 series time-series data analysis tool

OS-2000 series time-series data analysis tool

The OS-2000 series is software for freely editing and analyzing long time-series data that cannot be handled by Excel.

In addition to data recorded with the BF-3200, it can handle proprietary data from various recorders, as well as general-purpose formats such as CSV and WAVE files. It features video playback, FFT analysis, fluctuation sound analysis, and various filter functions, as well as sound quality evaluation functions.

MB-2200M10 Ultraminiature Microphone- Ideal for visualizing sound sources below 500 Hz

Inquire about this product.

最終更新日:2024/02/20