This software utilizes a proprietary beamforming calculation method developed by Ono Sokki to create a sound source visualization system that achieves the same sound source position resolution as a conventional system with 36 microphones (based on our own comparison) using only four microphones. By reducing the number of microphones used, the microphone array becomes smaller and lighter, allowing users to search for sound sources even in confined spaces where conventional beamforming equipment is difficult, by holding and moving the microphone array by hand.
This software consists of real-time monitoring software and offline analysis software. The real-time monitoring software analyzes sound sources at a rate of 5 times per second and displays the analysis results by overlaying them with video from an attached camera. The monitoring software also has recording and video recording functions, and this data can be processed by the time-series analysis software Oscope to play back the sound, perform frequency analysis, and filter processing, allowing for the detection of sound characteristics. Subsequently, offline analysis is performed to determine the sound source location, enabling beamforming calculations with a time resolution of 25 times per second, allowing for the exploration of when and where sudden sounds are occurring.
The system configuration consists of a data station (DS-3200), a 3D SI probe, a microphone amplifier, a USB camera set, and a personal computer. Users of our 3D acoustic intensity system can build a sound source visualization system using a new beamforming method by adding a USB camera and software (4-channel beamforming software, Oscope, video option) and a USB conversion cable for the FFT unit. This system makes it easy to locate sound sources such as machinery in automobiles, railways, and home appliances, electrical and electronic components, roads, tunnels, pumps, and motors.
- A newly developed beamforming calculation method enables sound source location isolation even with fewer microphones.
- The sound intensity from the object being measured is overlaid as a color map on the video from the USB camera.
- Real-time monitoring software allows you to perform the search while viewing the results of the sound source detection.
- The real-time monitoring software allows you to select and analyze a frequency band of 1/3 octave.
- The monitoring software allows for offline analysis of recorded audio and video data.
- Offline analysis software can perform analysis with improved spatial resolution of the sound source.
- Even when multiple single sounds occur, the temporal resolution of the timing of their occurrence can be improved for analysis.
- It consists of a 3D SI probe (MI-6420), microphone amplifier (CF-0610), data station (DS-3200), and laptop computer, making it easily portable.
- The 3D SI probe (MI-6420) is small and lightweight, making it usable even in confined spaces such as car interiors.
