And indeed: the correct answer to your question you already provided yourself. :-) The pitch is achieved by making the delay one wavelength long: second / frequency => del.delay; Sometimes however, introducing a (resonant) filter changes the tuning a bit, so then you need to tune more on ear.
best, Casper On Thu, Oct 12, 2017 at 9:06 AM, Casper Schipper <casper.schip...@gmail.com> wrote: > Dear Michael, > > From the description it looks like a feedback delay (= comb filter) with > another (lowpass) filter in the loop. This type of feedback network can be > used like a basic (perhaps even simplistic) physical model of vibrating > objects like strings, collumns of air in tubes etc. The general term is > waveguide synthesis. A feedback loop with a lowpass in the feedback is > often used to produce plucked string like sounds. Karplus-Strong synthesis > is the original name for one particular efficient implementation of it > (using a simple 2 sample averaging as the lowpass filter, and filling the > delay line with noise at the start). You can also have really nice affects > adding some distortion or wave shaping in the loop (x - x^3 etc..). Chuck > is a really great language for building these things, since you can easily > write your own filters and shapers using Chugen, or Fauck (Faust for > chuck). But Faust takes a little more reading to understand in my opinion. > > If your interested to dive deeper, there is an excellent online book by > Julius O Smith III, which starts with very simple models and goes into very > detailed models of a lot instruments (reeds, drums, flutes etc). His work > also formed the basis of some of the STK Ugens in ChucK: > https://ccrma.stanford.edu/~jos/pmupd/Strings.html > > best, > Casper > > > > On Wed, Oct 11, 2017 at 10:22 PM, Michael Heuer <heue...@gmail.com> wrote: > >> All, >> >> The Dave Smith DSM03 Feedback module has what is described as tuned >> feedback >> >> https://www.davesmithinstruments.com/product/dsm03-feedback-module/ >> >> I have the same question as was posted here >> >> "I'm trying to understand what 'tuned feedback' means -- does this mean >> the signal enters a delay line that lasts one cycle of a certain pitch? >> (So, say, a 50Hz sound is a 20ms delay line.) Does this end up reinforcing >> that pitch when you hear the sound? (I guess it would reinforce multiples >> of the pitch too, but less so.)" >> >> https://www.kvraudio.com/forum/viewtopic.php?p=1673572&sid=a >> e6a060ebaffea267114c1b6b5edde68#p1673572 >> >> Thanks! >> >> michael >> >> >> _______________________________________________ >> chuck-users mailing list >> chuck-users@lists.cs.princeton.edu >> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users >> >> > > > -- > Casper Schipper > casper.schip...@gmail.com > +31 6 52 322 590 > -- Casper Schipper casper.schip...@gmail.com +31 6 52 322 590
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