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Practical considerations of time-varying feedback delay networks

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

Audio Engineering Society -AES-:
138th Audio Engineering Society Convention 2015. Vol.1 : Warsaw, Poland, 7 - 10 May 2015
Red Hook, NY: Curran, 2015
ISBN: 978-1-5108-0659-7
Audio Engineering Society (AES Convention) <138, 2015, Warsaw>
Fraunhofer IIS ()

Feedback delay networks (FDNs) can be efficiently used to generate parametric artificial reverberation. Recently, the authors proposed a novel approach to time-varying FDNs by introducing a time-varying feedback matrix. The formulation of the time-varying feedback matrix was given in the complex eigenvalue domain, whereas this contribution specifies the requirements for real valued time-domain processing. In addition, the computational costs of different time-varying feedback matrices, which depend on the matrix type and modulation function, are discussed. In a performance evaluation, the proposed orthogonal matrix modulation is compared to a direct interpolation of the matrix entries.