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.

Authors: Schlecht, Sebastian; Habets, Emanuël A.P.
Affiliation: International Audio Laboratories Erlangen, Erlangen, Germany
AES Conference: 59th International Conference: Sound Reinforcement Engineering and Technology (July 2015)
Paper Number: 3-2
Publication Date: July 10, 2015
Subject: Electronic Architecture and Reverberation Enhancement

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