tkzic

Trying to code an example of a "heterodyne filter" for a class I'm teaching - but am hazy on details. This example seems to work ok, but occasionally the result will invert from positive to negative. For example, when toggling DSP on/off. Wondering if there is something missing - or the implementation is wrong?

Reference: C. Roads, "Computer Music Tutorial", p. 548-549 "Heterodyne Filter Analysis"

http://cdn.intechopen.com/pdfs-wm/17796.pdf

Reference: C. Roads, "Computer Music Tutorial", p. 548-549 "Heterodyne Filter Analysis"
Also: http://cdn.intechopen.com/pdfs-wm/17796.pdf


heterodyne-filter

Looks like the phases of the input signal and real part of the analytic signal need to be synced for this to work. Will post a revised patch if anyone is interested :-)