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Hi!<br>
<br>
On 20.11.2010 05:25, Mathieu Bouchard wrote:
<blockquote
cite="mid:alpine.DEB.2.00.1011192133510.17917@paik.artengine.ca"
type="cite">On Sat, 20 Nov 2010, Martin Schied wrote:
<br>
<br>
<blockquote type="cite">no, sorry, I can't on the quick. but I
know for sure that frequency modulation only produces harmonics
if the carrier and modulator are in "simple" relations like 1:5
or your example 200 to 1000.
<br>
</blockquote>
<br>
I think that my reasoning is mostly correct and that our
difference is that while I'm insisting that periodic signals
remain periodic, you are insisting that nonperiodic signals remain
nonperiodic, or something like that.
<br>
</blockquote>
yes. My thinking of 'non harmonic" distortion is if you have a
signal whose preceived pitch frequency is harmonically unrelated to
the new perceived pitch after distortion. So if you had a signal of
100Hz (200, 300, 400 ... Harmonics) base pitch and add a 70Hz and
130Hz they would not fit the old spectrum very well. You will again
find a common 'base' frequency, for example 10Hz in this case, but
10Hz bands are too small in frequencies of 200, 300, 400Hz to be
perceived as harmonics. But it's difficult to argue about such
effects as we had to do many listening experiments before...<br>
<br>
<br>
<blockquote
cite="mid:alpine.DEB.2.00.1011192133510.17917@paik.artengine.ca"
type="cite">
<br>
The correction I made just uses a [delread~].
<br>
<br>
For example if you have [+~ 1]-[*~ 5]-[+~ 2], you need a [delread~
a 7], because 1*5+2 = 7.
<br>
</blockquote>
oh, great indeed :)<br>
<blockquote
cite="mid:alpine.DEB.2.00.1011192133510.17917@paik.artengine.ca"
type="cite">
<br>
<blockquote type="cite">it's only because of the slight delay I'd
be interested to eliminate. But as you also said I don't expect
any big difference between the delay free case and the vd~ case
as the modulations occuring with a slight off phase will not
sound any different. (however 2ms can be quite different for
short percussive signals)
<br>
</blockquote>
<br>
Well, it does sound different in some way, but the changes I get
by changing that delay, are less special than what I get by making
that effect happen in the first place, instead of not. It makes me
think of other delay tricks such as comb filters.
<br>
</blockquote>
I'm curious what you planned...<br>
<blockquote
cite="mid:alpine.DEB.2.00.1011192133510.17917@paik.artengine.ca"
type="cite">
<br>
<blockquote type="cite">yep, that's also one of the effects I
wanted to eliminate by the moving write head.
<br>
</blockquote>
<br>
If you make a "moving write head" thing, though, it needs to be
additive,</blockquote>
that's easy doable<br>
<blockquote
cite="mid:alpine.DEB.2.00.1011192133510.17917@paik.artengine.ca"
type="cite"> and the energy has to get stretched like the
derivative of the motion (the speed of the head).</blockquote>
or accumulated. there also might happen a supersonic bang (but
before, there are problem with the sampling theoreme not been met
anymore).<br>
<blockquote
cite="mid:alpine.DEB.2.00.1011192133510.17917@paik.artengine.ca"
type="cite"> The data may have to be spread into a
not-very-bounded amount of array elements.<br>
</blockquote>
its bounds could be set to a fixed maximum, like for [delwrite
1000]. <br>
<br>
too much to start off for me, I should learn proper c before and
know more about interpolation (and the internals of pd too).<br>
<br>
Martin<br>
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