Fractionally-addressed delay lines

Details Fractionally-addressed delay lines Fractionally-addressed delay lines

2000-05-17

arxiv.org/abs/cs/0005022v2

IEEE Transactions on Speech and Audio Processing, vol. 8, no. 6, november 2000, pp. 717-727

Computer Science

Sound

11 pages, 19 figures, to be published in IEEE Transactions on Speech and Audio Processing Corrected ACM-class

Scientific paper

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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