Digital audio filters whose parameters vary with time are analyzed according to the Time-Varying filter theory. Such a theory allows for recursive filter realization using finite order difference equations with time-varying coefficients. With this approach, the errors occurring during parameter transitions can be evaluated. It was found that such errors were significant for abrupt variation in filter parameters. A real-time microprocessor implementation for such a filter is also presented. Using a novel test, the real-time output of the varying filter was evaluated, so that perceived filter transition discontinuities could be detected.

Authors: Mourjopoulos, John N.; Kyriakis-Bitzaros, E. D.; Goutis, E. E.
Affiliation: University of Patras, Patras, Greece
AES Convention: 86 (March 1989) Paper Number: 2773
Publication Date: March 1, 1989
Subject: Digital Signal Processing

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