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

[Chris McDowell]

> If you're going to generate the signals as WAV files, wouldn't it be better to just use Matlab or C++

if I'm exporting wavs from ltspice, it's to hear what ltspice thinks this exact circuit sounds like. in this case "exactly what you want" is the circuit's output. 

Cheers,
Chris 

> On May 18, 2024, at 6:02 AM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> 
> 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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> Submit email to: Synth-diy at synth-diy.org
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> Selling or trading? Use marketplace at synth-diy.org
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
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