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This paper describes ongoing efforts toward optimizing the Virtual Acoustics Technology (VAT) system installed in the Immersive Media Lab at McGill University. Following the integration of the CAVIAR cancelling auralizer for feedback suppression, this current iteration of the active acoustics system is able to flexibly support the creation of virtual environments via the convolution of Spatial Room Impulse Responses (SRIRs) with real-time microphone signals. While the system has been successfully used for both recordings and live performances, we have nevertheless been looking to improve upon its “stability from feedback” and “natural sound quality,” two significant attributes of active acoustics systems [1]. We have implemented new software controls and microphone input methods to increase our ratio of gain before feedback, while additionally repositioning and adding loudspeakers to the system to generate a more even room coverage. Following these additions, we continue to evaluate the space through objective measurements and feedback from musicians and listeners.
[1] M. A. Poletti, “Active Acoustic Systems for the Control of Room Acoustics,” in Proceedings of the International Symposium on Room Acoustics, Melbourne, Australia, Aug. 2010.