48 channel beamforming microphone array for universal application
This ring array is a 48 channel measurement system, which is the most popular and universal microphone array in the portfolio. It is especially used in the field of fault detection and quality control.
The custom made carbon fiber array body ensures easy handling and precise array positioning due to its low weight. Furthermore, the geometry secures the greatest versatility and best possible local resolution of the acoustic map.
This array can be operated with the data recorder.
The lightweight array body is designed as slim as possible and is made of carbon fiber. This ensures easy handling and accurate microphone positioning. The wiring of the microphones is enclosed in and protected by the array body which guarantees the best possible acoustic transparency to measure accurate sound levels. The array design is optimized to provide the highest spatial resolution possible while providing a high depth of field to see all sources in one acoustic map independent of distance (within reason).
The built-in studio microphones have an extremely linear frequency response. All mics are carefully hand-selected and calibrated to ensure stable sound pressure levels (+/- 0.5 dB). To allow long distances, the array is connected to the data recorder via two differential SymBus microphone connector cables (max. 20 m). The array comes with an integrated fixed focus camera, which can be supplied as USB or Ethernet version, delivered in different sensor sizes, resolutions and frame rates. The included high-end Manfrotto tripod allows a set up in almost any measurement environment imaginable. Array and tripod are supplied in a transport case and bag respectively.
Technical Data
Array body diameter
75 cm
Weight
1.8 kg
Video camera
Intel® RealSense™ Depth Camera D435
Optional: Baumer VCXG-25C
Resolution
1920 x 1080 (Full HD)
Microphones
Electret condenser capsule
+ special designed preamplifier
Dynamic range
(Distance to the source: 1 m;
calculation points: 90,000)
8 dB – 11 dB, up to 50 dB with
advanced algorithms
Ingress protection code
IP20
Cable length to data recorder
up to 20 m (on request: 50 m)
Operating environment
0 °C – 35 °C, up to 80 % RH (RealSense)
0 °C – 45 °C, up to 80 % RH (Baumer)
Videos
ACOUSTIC CAMERA Sound source localization analysis of a Kuka robot
This is a beamforming analysis example of a Kuka robot in NoiseImage 4.5.2. The measurement was taken by gfai tech’s Acoustic Camera Team with a 48 channel microphone ring array at 192 kHz sampling rate. From the created spectogram it shows different frequency ranges for the calculation of an acoustic photo of the robot. Accordingly, the different areas of the sound sources become visible, depending on the time-frequency range marked.
ACOUSTIC CAMERA: Beamforming result of the sound of a gearbox
This is an example of the use of the the acoustic Virtual Sound Studio in NoiseImage4 and a High Dynamic Range (HDR) acoustic image of a real life recording of a gearbox. The measurement was taken by the Acoustic Camera Team with a 48 channel Microphone Ring-array at 192kHz sampling rate. In order to listen to the surface of the object unfiltered (dBA) the data was only A-weighted, calculated with the HDR-Algorithm and mapped onto a 3D CAD model over all frequencies. The displayed map-dynamic of the acoustic photo is to be 30.0 dBA.
ACOUSTIC CAMERA: Visualizing the sound of musicians
Find out how the Acoustic Camera uses beamforming to visualize the sound produced by music instruments. This beamforming movie is an example of a prototype for an interactive visualization system to visualize musicians while they are performing.
ACOUSTIC CAMERA Car door sound leakage test White noise localization
This is a beamforming analysis example of a car door in NoiseImage4. The measurement was taken by the gfai tech Acoustic Camera Team with a white noise source inside the car, plus the speaker system. The set-up was recorded by a 48 channel Microphone Ring Array at 192 kHz sampling rate. The spectrum is the basis for the calculation of an acoustic photo of the door. Depending on the frequency range marked in the spectrum, different sound sources become visible.
ACOUSTIC CAMERA: Complete Setup and Measurement AC Pro System
The Acoustic Camera Pro systems of gfai tech GmbH promise a simple and fast handling. Due to its quick and easy setup, the Acoustic Camera is ready for use within 1.50 minutes, and first results are available just as quickly. All our arrays are portable and can be set up by just one person. Due to the advantageous cable assemblies, even non-experts can connect the measuring system with just a few clicks. Different arrays in various shapes, sizes and configurations can be found in the portfolio of gfai tech GmbH. Whether for small or large measurement objects, low or high frequencies, near or far field measurements, we have the right microphone array for every application. The Acoustic Camera AC Pro system is developed fully in-house here in Berlin. It comprises a Microphone Array, the software NoiseImage and a Data Recorder. Hardware for the measurements and software for analysis and evaluation can be extended by different Accessoires for additional functions. The components are fully integrated and cover the whole process from measurement to analysis and evaluation.
 
