Acoustic Measurement Microphone Array (AMMA)

The Acoustic Measurement Microphone Array (AMMA) is a specially-designed 72-element audio sampling system that features a reconfigurable 8-segment 180-degree arc with 64 evenly distributed transducing elements at a radius of 550 – 590 mm. There is an additional 8-element linear array comb that can be used in conjunction with the system.

All 72 elements may be sampled simultaneously at 48 kHz. The array can be extended to 128 elements by simply adding additional mics, pre-amps, and digital converters.

Emission elements may be mounted on a numerically controlled rotary stage. Emitters can be driven with computer-generated signals for closed-loop measurements, or independently for open-loop measurements.

NOTE: The system originally included a robotic arm to hold one 8-element linear comb (as seen in the diagrams below). However, the control system for the arm and the rotary stage is no longer functioning. A B&K rotary stage from CIRMMT has more recently been used instead.

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