Microphone Array Ring32 AC Pro


32 channel beamforming array

This ring array is a 32 channel measurement system primarily designed for applications in acoustic laboratories, but is also used in a wide variety of other applications and environments, such as component testing and troubleshooting.

The lightweight carbon fiber array-body is designed as slim as possible to also be used in difficult to access measurement environments and to ensure easy handling.

The geometry of the Ring32 ensures robust performance and minimal aliasing effects.

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
Frequency response 20 kHz – 60 kHz (< 15 dB)
100 Hz – 15 kHz ( < 0.5 dB)
20 Hz – 20 kHz (< 3 dB)
Max. sound pressure level 130 dB at 3 % THD
Noise level 27 dB(A)
Sensitivity 20 mV/Pa
Channels 48
Recommended measurement distance > 0.5 m
Acoustic mapping range 12 dB – 130 dB
Recommended mapping frequencies 164 Hz – 20 kHz (60 kHz)
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)


ACOUSTIC CAMERA: Frequency analysis of a train brake

This is an beamforming analysis example of a train braking system in NoiseImage4. The measurement was taken by the gfai tech Acoustic Camera Team with a 32 channel Microphone Ring-array at 96 kHz sampling rate. From the created spectogram it shows different frequency ranges for the calculation of an acoustic photo of the brake. Then the different areas of the sound sources become visible, depending on the time-frequency range marked. For easy interpretation the displayed map-dynamic of the acoustic photo is to be 7.0 dBA. We did not play the sound for a reason – trust us you don’t want to hear that very tonal sound of the brake!


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.


Acoustic Camera Ring32 Acoustic Camera Overview. The Original. Acoustic Camera. Listening With Your Eyes.

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