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Reverberation enhancement systems with time-varying mixing matrices

: Schlecht, Sebastian J.; Habets, Emanuël A.P.

Kok, B. ; Audio Engineering Society -AES-:
59th AES International Conference 2015. Sound Reinforcement, Engineering and Technology : Montreal, Canada, 15-17 July 2015
Red Hook, NY: Curran, 2015
ISBN: 978-1-5108-1017-4
Audio Engineering Society (AES International Conference) <59, 2015, Montreal>
Fraunhofer IIS ()

This paper presents a technique to increase the stability of a reverberation enhancement system (RES) via time-variation. RESs are installed in rooms to extend the physical reverberation time via electroacoustic feedback. By introducing variations in the feedback path, the probability that energy builds-up is reduced, and therefore the gain before instability is increased. Time-varying mixing of the feedback paths by unitary matrices is guaranteed to be energy-conserving and introduces variations of the added reverberation generated by a feedback delay network. The theory of time-varying matrices is reviewed and a practical demonstration is given.