[PD] Spectral focusing

William Brent william.brent at gmail.com
Thu May 26 04:50:54 CEST 2011

Hi Zax,

Maybe a straight up vocoder is too primitive for the kind of sound
you're after, but who knows...  For what it's worth, I have a vocoder
patch in my timbreID examples package with filters that are spaced
evenly in Barks.  You can also tune the relative amplitudes of the
filter outputs.

Of course, it still might just make everything sound like a robot :)

On Wed, May 25, 2011 at 9:24 PM,  <eran at mx.kein.org> wrote:
> Hello list,
> After a few years of maxing I migrated back to PD about a year and a half
> ago and haven’t looked back.
> Now I ran into a stumbling block and I figured I turn to you for help:
> I’m looking for a way to impose a harmonic spectrum on a non-harmonic
> signal. I tried cross-synthesis with a harmonic signal, which is ok, but
> what I’m actually trying to do is to “tune” a field recording, in a way,
> so it can have harmonic relations to a live instrument.
> I played with the pvtune~ object from fftease which is nice, but the
> results end up sounding a bit autotune-ish. And I also tried driving a few
> vcf~ filters with frequencies running from fiddle~/sigmund~ but the
> fundamental from these objects is too erratic and it sounds very
> unnatural.
> Wishart describes in his book a technique he calls spectral focusing,
> which relies on lpc. He says that lpc can be set to generate a filter bank
> which is distributed evenly with respect to pitch, but I’m not sure I
> understand what he means and how it can be done in PD. lpc seems to output
> a set of amplitudes for the coefficients. Can I set the filters to
> frequencies of my choice?
> Any help with this would be greatly appreciated,
> Zax
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William Brent

“Great minds flock together”
Conflations: conversational idiom for the 21st century


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