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Fractionally-addressed delay lines

Davide Rocchesso
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Abstract

While traditional implementations of variable-length digital delay lines are based on a circular buffer accessed by two pointers, we propose an implementation where a single fractional pointer is used both for read and write operations. On modern general-purpose architectures, the proposed method is nearly as efficient as the popularinterpolated circular buffer, and it behaves well for delay-length modulations commonly found in digital audio effects. The physical interpretation of the new implementation shows that it is suitable for simulating tension or density modulations in wave-propagating media.

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Davide Rocchesso. 2000-05-17. Fractionally-addressed delay lines. https://doi.org/10.1109/89.876310

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