[music-dsp] IIR Hilbert Transform

[James Chandler Jr]

Regarding the recent discussion of Hilbert Transform.

Found a practical-looking audio example of an IIR Hilbert Transformer in the
csound source code, in the source file "ugsc.c".

/* hilbert.c
 *
 * Copyright 1999, by Sean M. Costello
 *
 * hilbert is an implementation of an IIR Hilbert transformer.
 * The structure is based on two 6th-order allpass filters in
 * parallel, with a constant phase difference of 90 degrees
 * (+- some small amount of error) between the two outputs.
 * Allpass coefficients are calculated at i-time.
 */

/* pole values taken from Bernie Hutchins, "Musical Engineer's Handbook" */

Wow, it was first prototyped in analog, no less!!!

James Chandler Jr.





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