[sdiy] *EXT* Re: Becoming better at understanding difficult analog schematics

[Mike Bryant]

If you're going to generate the signals as WAV files, wouldn't it be better to just use Matlab or C++ and produce exactly what you want, rather than some simulation of a circuit that produced something that probably wasn't quite the same as a real percussion instrument in any case ?


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of rburnett at richieburnett.co.uk <rburnett at richieburnett.co.uk>
Sent: 18 May 2024 11:55
To: Mattias Rickardsson <mr at analogue.org>
Cc: ackolonges fds via Synth-diy <synth-diy at synth-diy.org>
Subject: Re: [sdiy] *EXT* Re: Becoming better at understanding difficult analog schematics

You can set the maximum time-step of the simulation to something like
2us and save the WAV file at a high sample rate like 192kHz.  Then load
that into an audio editor, band-limit to 20kHz and resample to 48kHz
before saving.  I find that gives better results for simulations that
exhibit an inherently "high-pass" response like hi-hats, etc.  (Another
thing that helps is to follow the circuit being simulated with a basic
1st or 2nd-order 20kHz low-pass RC filter before writing the waveform
out to a WAV file.  This curtails some of the ultrasonic stuff so it
aliases less in the WAV file.)

Good VA has a lot in common with Spice simulations, but it has to be a
bit cleverer to render in real-time and to handle things like
non-linearities and discontinuities in a way that doesn't result in
unacceptable levels of aliasing in the final audio output.

Being able to export simulation results to WAV audio files is still a
neat feature though, aliasing and all!

-Richie,



> Very useful for prototyping, but it's aliasing like crazy if you
> produce rapidly changing signals like cymbals etc. The simulations are
> neither band-limited nor having constant timesteps. Virtual analog
> synthesis is something else. :-)
>
> /mr
>
>>
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________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of rburnett at richieburnett.co.uk <rburnett at richieburnett.co.uk>
Sent: 18 May 2024 11:55
To: Mattias Rickardsson <mr at analogue.org>
Cc: ackolonges fds via Synth-diy <synth-diy at synth-diy.org>
Subject: Re: [sdiy] *EXT* Re: Becoming better at understanding difficult analog schematics

You can set the maximum time-step of the simulation to something like
2us and save the WAV file at a high sample rate like 192kHz.  Then load
that into an audio editor, band-limit to 20kHz and resample to 48kHz
before saving.  I find that gives better results for simulations that
exhibit an inherently "high-pass" response like hi-hats, etc.  (Another
thing that helps is to follow the circuit being simulated with a basic
1st or 2nd-order 20kHz low-pass RC filter before writing the waveform
out to a WAV file.  This curtails some of the ultrasonic stuff so it
aliases less in the WAV file.)

Good VA has a lot in common with Spice simulations, but it has to be a
bit cleverer to render in real-time and to handle things like
non-linearities and discontinuities in a way that doesn't result in
unacceptable levels of aliasing in the final audio output.

Being able to export simulation results to WAV audio files is still a
neat feature though, aliasing and all!

-Richie,



> Very useful for prototyping, but it's aliasing like crazy if you
> produce rapidly changing signals like cymbals etc. The simulations are
> neither band-limited nor having constant timesteps. Virtual analog
> synthesis is something else. :-)
>
> /mr
>
>>
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