<html><body><font face="Helvetica">Richie --<br><br>All true enough, but I'm not clear on what your point is. I don't hear any chirp when a note is attacked on a violin. I just tried pulsing my string filter: I can see the output is dispered, taking 100 ms or so to totally die out, but I don't perceive anything like a chirp. It just sounds like someone beating on a drum. Perhaps at a much higher Q setting you could perceive the chirp, but nothing when in normal operation, as far as I can tell. And why would you call it all effed up when it is emulating a violin? :-)<br><br>Ian<br><br><br>Sent from XFINITY Connect Mobile App<br><br><br>------ Original Message ------<br><br>From: Richie Burnett<br>To: Mattias Rickardsson, Tom Wiltshire<br>Cc: Synth DIY<br>Sent: June 30, 2017 at 9:41 AM<br>Subject: Re: [sdiy] Resonator type filters<br><br>If you pass a transient through a whole bank of high-Q analogue bandpass <br>filters in parallel and then recombine their outputs what you end up doing <br>is dispersing the energy. Even if their responses combine in equal <br>proportions to give a more or less flat magnitude response, different <br>frequency components incur different delays unless some measures are taken <br>to compensate for this. As you said the more bands you have in your <br>vocoder, for example, the high the Q-factors, and the more rapidly the phase <br>changes across the bandwidth of each individual filter, and therefore the <br>more severe the dispersion you get when you feed transients through the <br>parallel filter bank as a whole. For example, a click gets transformed into <br>a chirp... Or f####d up as you put it.<br><br>-Richie,<br><br>-----Original Message----- <br>From: Mattias Rickardsson<br>Sent: Friday, June 30, 2017 2:48 PM<br>To: Tom Wiltshire<br>Cc: Synth DIY<br>Subject: Re: [sdiy] Resonator type filters<br><br>On 30 June 2017 at 10:46, Tom Wiltshire <tom@electricdruid.net> wrote:<br>> Is there some reason why string filters use a large number of fixed bands, <br>> rather than fewer variable ones?<br><br>Isn't the goal also to make the phase as messy as possible?<br><br>I always think it seems to sound more wooden the higher the number of<br>resonant bands you have in a vocoder-type filter... even if all the<br>bands are set to middle position. And I guess the phases of the sound<br>is what's mostly modified then. Steady-state sounds are not as<br>spectacular, but every sudden transient will be fücked up.<br><br>/mr<br><br>_______________________________________________<br>Synth-diy mailing list<br>Synth-diy@synth-diy.org<br>http://synth-diy.org/mailman/listinfo/synth-diy<br><br><br>---<br>This email has been checked for viruses by AVG.<br>http://www.avg.com <br><br>_______________________________________________<br>Synth-diy mailing list<br>Synth-diy@synth-diy.org<br>http://synth-diy.org/mailman/listinfo/synth-diy<br></font></body></html>