[sdiy] Karplus-Strong overblowing?

[cheater cheater]

Mike, any place I can read your wife's papers?

If Fettweis filters were used to simulate analogue filters before
digital could be used, how were those filters simulated if not
digitally? Or was this some sort of other, "higher level" simulation
(still digital, but eg not simulating the single electronic components
separately)?

Mattias, overblowing does not create octaving, it creates an overdrive
and a brighter sound while suppressing the fundamental. So odd
harmonics are not being removed by overblowing like you describe. I
suggest looking up demos of overblowing of brass instruments on
youtube.

Richie, some great comments and very useful and interesting. Those
"Reed Tables" sound like Volterra kernels.

Thanks

On Sun, Jan 4, 2026 at 6:51 PM Mike Bryant <mbryant at futurehorizons.com> wrote:
>
> Yes the Fettweis filter was used in simulating analogue filters for r.f. long before one could consider actually doing it digitally.  Avoiding hacking the PCB transmission line with a scalpel quite so much, adding 1pf capacitors or adding/removing a turn on a spring.
> ________________________________
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Josh Nursing via Synth-diy <synth-diy at synth-diy.org>
> Sent: 04 January 2026 17:20
> To: Synth DIY <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Karplus-Strong overblowing?
>
> And I made a mistake myself. The other tech is named "Wave Digital Filters", not "Waveguide Digital Filters".
>
> They were developed by Fettweis quite a long time ago.
>
> Josh
>
> On Sun, 4 Jan 2026 at 12:10, Mike Bryant <mbryant at futurehorizons.com> wrote:
>
> With modern processing meshes probably are applicable to audio as well now.  But they originated in other much slower system simulations which is where all the underlying maths was developed, partially by my wife long before they were called that 🙂
>
> And I never said 'Waveguide Digital Networks' - that was someone else and is a bit meaningless.
>
> But to me stating Digital Waveguides without the word Network implies a series of parallel waveguides with different characteristics possibly all summed into one at the end, nothing more.
>
>
> ________________________________
> From: Josh Nursing <josh.nursing at gmail.com>
> Sent: 04 January 2026 17:01
> To: Mike Bryant <mbryant at futurehorizons.com>
> Cc: Synth DIY <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Karplus-Strong overblowing?
>
> No, no, there are Digital Waveguide Meshes for audio and sound synthesis too.
>
> They're fairly more complex to implement and very processing power-hungry, but they're used for, among other things, surface modeling for Physical Modeling or Drums and other percussive instruments.
>
> As you can probably imagine, the junctions start getting more connections than in the simple D.W..
>
> Josh
>
> On Sun, 4 Jan 2026 at 11:41, Mike Bryant <mbryant at futurehorizons.com> wrote:
>
>
> However  the term outside of audio is Digital Waveguide Mesh.
>
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