pure data is something i have been wanting to look into. i suppose my reason for the spice thing is that one of my hobbies is building and modifying old valve amps (not a huge success rate at the moment though, but getting there... stupid old power transformers dying on me...). i know that spice will not give an accurate sound of a real valve, but it would be really handy to hear *changes* with circuit modifications on a real signal. things like frequency response are pretty straightforward i suppose, but what about things like sag and the effects of negative feedback? bit harder to judge from the schematic if you are a beginner like me :) i'll have to have a look at your spice thingy when i get home (my machine here isn't set up for stuff like that... yet :).
<br><br>off topic (from my off topic previous post...): does anyone know where to get *good* spice models for valves/tubes? especially working with oregano (i tried geda but it keeps crashing on me). also good transformer models (i know these can be done somehow with subcircuits, but as i said, i'm still a beginner. i just want some basic 4k/8ohm single ended and push-pull models for basic circuit building.
<br><br>thanks<br>porl<br><br><div><span class="gmail_quote">On 29/05/07, <b class="gmail_sendername">Robin Gareus</b> <<a href="mailto:robin@gareus.org">robin@gareus.org</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
porl sheean wrote:<br>>> Hmm. An interesting project might be hacking SPICE into being a<br>>> kind of a deconvolution engine,<br>>> to build a WAV impulse response file of a circuit. Then you could<br>>> use that IR to "play" through the circuit using JACE or similar.
<br><br>> i have been dreaming of this for so long :) i thought about it the<br>> other way though, using a 'custom' wave shape as a function generator<br>> in spice itself. would be very slow this way though.
<br><br>I've been dreaming about a /jackifiying/ spice ;) - I spiced up my<br>Pfingst Montag by added a libsndfile voltage-source to ng-spice. - For<br>simple circuits it's not too far-off real-time performance: it takes
<br>about 4 seconds to simulate 1 second of foxxtone at 48ksps over here.<br><br>Now it's Tueday and using a IR seems the way to go... simulating the<br>foxx effect alone is not trivial. Based on the posted schematics, here's
<br>a preliminary <a href="http://mir.dnsalias.com/_media/wiki/foxx.oregano.gz">http://mir.dnsalias.com/_media/wiki/foxx.oregano.gz</a> - try<br>yourself..<br><br>> the good news about doing this though is that you don't have to
<br>> (unless you want to) emulate everything about the circuit, just the<br>> signal path. this would simplify and speed up the calculations<br>> somewhat.<br><br>I've started to document the spice patch at<br>
<a href="http://mir.dnsalias.com/wiki/spicesound">http://mir.dnsalias.com/wiki/spicesound</a> - the code's barely a few hours<br>old and highly experimental. NTL, it's already allows to process spice3<br>netlists reading and generating wav file(s).
<br><br>robin<br><br>PS. pure-data is more fun than this!<br>_______________________________________________<br>Linux-audio-user mailing list<br><a href="mailto:Linux-audio-user@lists.linuxaudio.org">Linux-audio-user@lists.linuxaudio.org
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