<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><blockquote type="cite"><div dir="ltr"><div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">If you're going to generate the signals as WAV files, wouldn't it be better to just use Matlab or C++</div></div></blockquote><div><br></div><div>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. </div><br><div dir="ltr">Cheers,<div>Chris </div></div><div dir="ltr"><br><blockquote type="cite">On May 18, 2024, at 6:02 AM, Mike Bryant <mbryant@futurehorizons.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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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 ?</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of rburnett@richieburnett.co.uk <rburnett@richieburnett.co.uk><br>
<b>Sent:</b> 18 May 2024 11:55<br>
<b>To:</b> Mattias Rickardsson <mr@analogue.org><br>
<b>Cc:</b> ackolonges fds via Synth-diy <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] *EXT* Re: Becoming better at understanding difficult analog schematics</span>
<div> </div>
</div>
<div style="font-size: 11pt;">You can set the maximum time-step of the simulation to something like<br>
2us and save the WAV file at a high sample rate like 192kHz. Then load<br>
that into an audio editor, band-limit to 20kHz and resample to 48kHz<br>
before saving. I find that gives better results for simulations that<br>
exhibit an inherently "high-pass" response like hi-hats, etc. (Another<br>
thing that helps is to follow the circuit being simulated with a basic<br>
1st or 2nd-order 20kHz low-pass RC filter before writing the waveform<br>
out to a WAV file. This curtails some of the ultrasonic stuff so it<br>
aliases less in the WAV file.)<br>
<br>
Good VA has a lot in common with Spice simulations, but it has to be a<br>
bit cleverer to render in real-time and to handle things like<br>
non-linearities and discontinuities in a way that doesn't result in<br>
unacceptable levels of aliasing in the final audio output.<br>
<br>
Being able to export simulation results to WAV audio files is still a<br>
neat feature though, aliasing and all!<br>
<br>
-Richie,<br>
<br>
<br>
<br>
> Very useful for prototyping, but it's aliasing like crazy if you<br>
> produce rapidly changing signals like cymbals etc. The simulations are<br>
> neither band-limited nor having constant timesteps. Virtual analog<br>
> synthesis is something else. :-)<br>
><br>
> /mr<br>
><br>
>><br>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of rburnett@richieburnett.co.uk <rburnett@richieburnett.co.uk><br>
<b>Sent:</b> 18 May 2024 11:55<br>
<b>To:</b> Mattias Rickardsson <mr@analogue.org><br>
<b>Cc:</b> ackolonges fds via Synth-diy <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] *EXT* Re: Becoming better at understanding difficult analog schematics</span>
<div> </div>
</div>
<div style="font-size: 11pt;">You can set the maximum time-step of the simulation to something like<br>
2us and save the WAV file at a high sample rate like 192kHz. Then load<br>
that into an audio editor, band-limit to 20kHz and resample to 48kHz<br>
before saving. I find that gives better results for simulations that<br>
exhibit an inherently "high-pass" response like hi-hats, etc. (Another<br>
thing that helps is to follow the circuit being simulated with a basic<br>
1st or 2nd-order 20kHz low-pass RC filter before writing the waveform<br>
out to a WAV file. This curtails some of the ultrasonic stuff so it<br>
aliases less in the WAV file.)<br>
<br>
Good VA has a lot in common with Spice simulations, but it has to be a<br>
bit cleverer to render in real-time and to handle things like<br>
non-linearities and discontinuities in a way that doesn't result in<br>
unacceptable levels of aliasing in the final audio output.<br>
<br>
Being able to export simulation results to WAV audio files is still a<br>
neat feature though, aliasing and all!<br>
<br>
-Richie,<br>
<br>
<br>
<br>
> Very useful for prototyping, but it's aliasing like crazy if you<br>
> produce rapidly changing signals like cymbals etc. The simulations are<br>
> neither band-limited nor having constant timesteps. Virtual analog<br>
> synthesis is something else. :-)<br>
><br>
> /mr<br>
><br>
>><br>
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