Prime Power Delay-Line Lengths
When the delay-line lengths need to be varied in real time, or interactively in a GUI, it is convenient to choose each delay-line length as an integer power of a distinct prime number [457]:
Suppose we are initially given desired delay-line lengths arranged in ascending order so that
round
where is the desired length in samples. That is, can be
simply obtained by rounding
to the
nearest integer (max 1). The prime-power delay-line length
approximation is then of course
This prime-power length scheme is used to keep 16 delay lines both variable and mutually prime in Faust's reverb_designer.dsp programming example (via the function prime_power_delays in effect.lib).
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