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<p>Mattias - good comments</p>
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<p>What you say seems correct, except for the difficulty of ascribing pitch to short signals.</p>
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<p>If you ping a sharp bandpass, it rings essentially at the center frequency. if you ping it with an extended impulse train, the pitch generally becomes the pitch of the impulse train.This I recently discussed:</p>
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<a href="http://electronotes.netfirms.com/EN229.pdf" class="OWAAutoLink" id="LPlnk77548" previewremoved="true">http://electronotes.netfirms.com/EN229.pdf</a></div>
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<a href="http://electronotes.netfirms.com/EN229.pdf" class="OWAAutoLink" previewremoved="true"></a>For a moderate number of equally spaced impulses, you get (as you suspect) an intermediate result. But the tones may well be so short (delta-T is small) that
the pitch is poorly heard (delta-F is large - Heisenberg). </div>
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With a set of several resonances (let along 39 of them) expect and hope for something very interesting. </div>
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I kind of suspect that it is not pitches altered by the filters to a different scale, but rather the imposition of residual non-harmonic partials (unfamiliar instruments) that leave the major impression here.</div>
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Description of what is heard kind of rules over theory here! </div>
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Bernie<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> navelludd@gmail.com <navelludd@gmail.com> on behalf of Mattias Rickardsson <mr@analogue.org><br>
<b>Sent:</b> Wednesday, July 5, 2017 10:55 AM<br>
<b>To:</b> Bernard Arthur Hutchins Jr<br>
<b>Cc:</b> synth-diy@synth-diy.org<br>
<b>Subject:</b> Re: [sdiy] Resonator type filters</font>
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<div class="PlainText">On 3 July 2017 at 21:04, Bernard Arthur Hutchins Jr <bah13@cornell.edu> wrote:<br>
> A lot of questions here about how a filter bank is used and what it sounds<br>
> like are addressed in EN116 which I posted.<br>
><br>
> Basically, if nothing moves, it sounds like nothing: like sawtooth in,<br>
> different complex waveform out - equally boring. If something does move<br>
> (modulation, starts/stops, live music) it sounds tinny. I remember well<br>
> listening to music on the radio through the bank, turning the Q up, and<br>
> discovering that the western music sounded like eastern music. Possibly a<br>
> useful reference comment.<br>
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Oh, so it's some kind of longitude modulator then? ;-)<br>
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I think this could partly be caused by another side effect than the tinnyness:<br>
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Resonances shift the [percieved] pitch of short notes, when the<br>
resonant frequency is a bit off from the note's fundamental frequency.<br>
This is because the partials of a short note are spread out a bit in<br>
the spectrum due to the limited time it exists, and an nearby<br>
resonance can easily ring louder than the expected frequency of the<br>
note. (Just like listening to bass notes in a room with untreated room<br>
modes - the bass gets muddy not only by smearing in time, but it even<br>
gets hard to hear the pitches of the notes - you end up listening to<br>
the strongest room modes instead.)<br>
<br>
So perhaps the music got "out of tune" when run through all the<br>
resonances, and it sounded like oriental scales rather than western?<br>
:-)<br>
<br>
/mr<br>
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