Tests on a real-time acoustic beamformer as a virtual instrument

Authors:
T. J. Moir
Affiliations:
Institute of Information and Mathematical Sciences, Massey University at Albany, Auckland, New Zealand
Venue:
ISPRA'06 Proceedings of the 5th WSEAS International Conference on Signal Processing, Robotics and Automation
Year:
2006

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Abstract

An acoustic beamformer is implemented in LabVIEW on a PC. The two-microphone algorithm acts as a virtual instrument and is able to make real-time measurements and graphical displays which would be cumberson on a DSP processor. A robust voice-activity detector is used based on time-difference of arrival and the instrument is able to reduce non-stationary background noise from a radio by up to 20dB. This work is intended as a prototype for later implementation on DSP devices and to explore the limitations and applications of acoustic beamforming.