Signal Interface Group ACAM 100 acoustic array

The ACAM 100 acoustic array from Signal Interface Group allows users to create an acoustic image overlaid on an optical image to visualise sound sources at different frequencies. It consists of an array of 40 digital MEMS microphones on a 40 x 40 cm plate that are sampled simultaneously, each with a 24-bit resolution, providing phase information for digital signal processing algorithms. An acoustic membrane protects each microphone from dust and moisture.

A 5 MP optical camera is located in the centre of the array, allowing an optical image to be overlaid onto the acoustic image to visualise sound sources.

The array has two isolated digital inputs and two isolated digital outputs. These can be used for synchronisation with data acquisition systems, and one of the inputs can be used for a tachometer.

It enables users to lock onto and target specific sound sources, program the sample rate (50, 40, 25, 20, 12.5 or 10k) and employs digital low-pass filters to allow anti-aliasing. The maximum sound pressure is 112 dB and it holds an onboard buffer memory of 256 MB.

The product requires just one USB cable for microphones, optical camera, digital I/O and power. It is available either bundled with beamforming software as a complete system for end users or unbundled, with an API providing access to all of the array’s capabilities: an open platform for developers, system integrators and researchers.