4-channel beamforming sound source visualization system

Rental only (sales ended)

BF-3200/MI-5420A/BF-0310

The measurement unit consists of a system based on the Data Station DS-3200 combined with the MI-5420A microphone probe for source visualization, allowing two types of microphones—120 mm and 60 mm—to be swapped according to the analysis frequency. The data station's 4-channel connects to a microphone probe for sound source visualization. By adding 4 channels, you can connect Accelerometer or rotation sensors to monitor vibration waveforms and rotation speeds while connecting. For measurement and analysis, we use 4-channel beamforming software (BF-3200/BF-0310) and the Oscope time-series data analysis tool.

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

The software can be selected according to your purpose. For rapid problem-solving in the field, the BF-3200 (BF Monitor) is the basic package. Adding the optional BF-0310 (BF Offline Analysis) provides convenient features such as changing the number of color map divisions, narrowband visualization, and smoothing, enabling more detailed analysis. (Oscope is required separately.)

The sound produced when a door closes includes not only sounds in the low frequency range below 500 Hz, but also sounds above 1 kHz, such as latching noises, which are mixed together with a timing difference of 10 ms. The origin of each sound is visualized using a 4-channel beamforming sound source visualization system.

The BF-3200 allows you to monitor the sound source location in real time. With a rendering speed of 20 fps or higher, it can track transient sounds. For example, in the case of a door closing sound, you can see the sound source in the order of latch → around the door → ground.

We will perform offline analysis of the recorded data using Oscope. Since BF-0310 is software plugged into Oscope, it is possible to determine the sound source location while combining it with other analysis results. From the time waveform and frequency analysis results in the figure below, the sound pressure is high in the 1 kHz to 2.5 kHz band at timings A and B. Focusing on this timing and band, when we visualize the sound source, we can see that A is a latching sound and B is a door hitting sound.

Even sounds that the human ear perceives as a single entity can be analyzed in more detail over time and frequency to determine which parts of the sound are being generated at which points in time and across which frequency ranges. This can provide clues, for example, about which components need to be redesigned when improving sound quality, thus contributing to a shorter improvement process.

*1 Includes probe head, main body, and grip (cable not included).
*2 The camera lens cannot be changed.
*3 Using aftermarket grips or lighting may affect the measurement results.
*4 When routing wires through holes such as through-holes, please ensure the hole is at least 30 mm in diameter due to the presence of connectors.
*5 Multiple cables are bundled together using polyester and nylon.
*6 Used when placing the microphone probe.

*7 Definition of the Visualization Frequency Band
Definition 1: In a free sound field, when the distance between the sound source and the microphone is 1 m, the spatial resolution until the sound attenuation from the center of the sound source reaches -6 dB 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 field of view.
Even outside the visible frequency band range, analysis is possible for 1/3 octave bands with center frequencies from 315 Hz to 16 kHz.
*8 This applies when the frequency band is within the visible frequency range.
*9 This differs from the beamforming visualization frequency band.
*10 Depending on the play mode, it is possible to play bfm files included in Ver1.3 or later.
*11 Oscope Basic or higher, and the video option are required.
*12 To output to O-Chart, O-Chart Ver3.6 (sold separately) is required.
*13 Adjust the frame length using the force window.

*14 The BF-3200 supports a maximum of 8 channels. Even units with 10 or more channels can operate using up to 8 channels. However, it does not support 100 kHz units or frame link functionality.
*15 The BF-3200 is not compatible with the DS-2000 series or the DS-3100. (The BF-3100 was compatible.)
*16 USB hubs cannot be used.
*17 The BF-3200 does not require a license key to start up. The BF-0310 uses Oscope, so a license key is required.

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

*1 Includes two types of microphone probe heads (120 mm, 60 mm), camera, and a 3 m dedicated camera/microphone cable.
*2 Video playback option is required.
*3 This is required if you want to perform offline analysis with a function equivalent to the BPF function of the BF monitor.

最終更新日:2024/02/20