... functions1
see ``On the Radiation of Sound from an Unflanged Circular Pipe'', Physical Review, vol. 73, no.4, February 15 1948
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... one2
The scalar determines the transition between the low-frequency and high-frequency behaviour.
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... radius.3
See ``A Simple, Accurate wall loss filter for acoustic tubes'', by Jonthan Abel and Tamara Smyth, DAFX 2003, for details.
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