[sdiy] Dispersive Karplus-Strong

Mike Bryant mbryant at futurehorizons.com
Sat Feb 19 10:08:34 CET 2022

Do you mean a delay line system ?   It's not an oscillator as such - all the energy comes from the initial impulse.

That said you could change the delay dynamically which would probably give an effect more similar to the vibrato arm on a guitar rather than FM synthesis.

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of cheater cheater via Synth-diy
Sent: 19 February 2022 07:27
To: Richie Burnett
Cc: synth-diy
Subject: Re: [sdiy] Dispersive Karplus-Strong

Another question - does this sort of oscillator yield itself to things like pitch changes or FM?

On Sat, Feb 19, 2022 at 1:48 AM cheater cheater <cheater00social at gmail.com> wrote:
> does anyone have any sound demos of a pure oscillator playing a fixed 
> pitch, no filtering etc? preferrably wav, not mp3.
> On Fri, Feb 18, 2022 at 8:32 PM Richie Burnett 
> <rburnett at richieburnett.co.uk> wrote:
> >
> > I think the normal K-S algorithm already has a pure delay (with a whole number of samples) in series with an allpass filter (to give a fractional sample delay.)  Otherwise you're limited to quantised pitches if you have to only use delay lengths that are an integer number of samples long. So I guess the normal K-S algorithm is dispersive to some extent.
> >
> > Incidentally you can tell if the harmonic series is stretched by looking at consecutive periods of the waveform. If every cycle looks just like the next cycle then all of the harmonics are integer multiples of the fundamental. If the harmonics are slightly flat or sharp you get little ripples that ride along the waveform from one cycle to the next. The waveform looks like it "evolves" with time.
> >
> > -Richie,
> >
> >
> >
> > ---- cheater cheater via Synth-diy wrote ----
> >
> > >Hi, I was wondering if anyone ever tried Karplus-Strong synthesis 
> > >with an all-pass filter (APF) in the feedback, in order to obtain 
> > >stretched tuning, and what your results were.
> > >
> > >https://ccrma.stanford.edu/~jos/pasp/Dispersive_1D_Wave_Equation.ht
> > >ml _______________________________________________
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> > >Synth-diy at synth-diy.org
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