Group Delay-Based Allpass Filters for Abstract Sound Synthesis and Audio Effects Processing

Elliot K. Canfield-Dafilou; Jonathan S. Abel
DAFx-2018 - Aveiro
An algorithm for artistic spectral audio processing and synthesis using allpass filters is presented. These filters express group delay trajectories, allowing fine control of their frequency-dependent arrival times. We present methods for designing the group delay trajectories to yield a novel class of filters for sound synthesis and audio effects processing. A number of categories of group delay trajectory design are discussed, including stair-stepped, modulated, and probabilistic. Synthesis and processing examples are provided.