A block FFT implementation of convolution is vastly more efficient than the direct form FIR filter. Unfortunately, block processing incurs significant input/output delay which is undesirable for real-time applications. A hybrid convolution method is proposed which combines direct form and block FFT processing. The result is a zero delay convolver that performs significantly better than direct form methods.

Author: Gardner, William G.
Affiliation: MIT Media Lab, Cambridge, MA
AES Convention: 97 (November 1994) Paper Number: 3897
Publication Date: November 1, 1994
Subject: DSP in the Digital Domain

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