Signal Interface Group ACAM 100 acoustic array

The Signal Interface Group ACAM 100 acoustic array allows users to create an acoustic image overlaid on an optical image, to visualise sound sources at different frequencies.

The product consists of an array of 40 digital MEMS microphones on a 40 x 40 cm plate which are sampled simultaneously, each with a 24-bit resolution. The microphones provide accurate 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 product 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 K, 40 K, 25 K, 20 K, 12.5 K or 10 K) 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, power and communicates to a PC through a USB 2.0 port. 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.

Applications include manufacturing, architecture, security, environmental monitoring, health and safety as well as research.