[PD] Help - filters & band limited oscillators!

David Powers cyborgk at gmail.com
Thu Mar 15 06:09:34 CET 2007


Workshop went well. I used VST's though, except for additive and wavetable ...

But ... how hard is it to compile for winxp? I will try tomorrow if
it's possible... I've got visual C++, and cygwin...

~D

On 3/14/07, Martin Peach <martin.peach at sympatico.ca> wrote:
> Did anyone try sqosc~ yet? I'm interested to get feedback on that one.
>
> http://pure-data.cvs.sourceforge.net/pure-data/externals/mrpeach/sqosc~/
>
> Martin
>
> David Powers wrote:
> > Hi Roman, I get the following error from your patch, for many of the tables:
> > error: 1002-square33: number of points (512) not a power of 2 plus three
> >
> > Along with this error, it seems to stop playing somewhere above 360 Hz...
> >
> > Thanks for your help, I'm sorry to sound grumpy, it's just that in
> > searching the archives mostly all I found was my old query for a year
> > ago. Plus everyone says to use [blosc~] but I posted in my first post,
> > that [blosc~] is broken, and I believe that it's known, ie here is
> > says:
> > http://blog.soundsorange.net/index.php/archives/2006/09/28/exploring-pd-extended/
> > "exploring pd extended
> > 27/9/2006
> > CPU load rating
> > blosc~ - intriguing band limited oscillators, but patch is self
> > referential and not working"
> >
> > Again, a reminder that this isn't really for me, but rather, it's the
> > list members chance to sell other people on PD being useful, or not,
> > to the outside world. [vst~] is working great so I can demonstrate
> > subtractive synthesis with VST's within pure data, but that's
> > suggesting to people that PD isn't really good for  traditional
> > synthesis... So if you think PD is good for synthesis, let me know
> > about it!!!
> >
> > ***Note: I personally don't use PD with Gem for VJing, and to make
> > weird generative MIDI sequences, mostly... I never really considered
> > synthesis a strong point for PD, for reasons that should now be
> > obvious.
> >
> > ~David
> >
> > On 3/14/07, Roman Haefeli <reduzierer at yahoo.de> wrote:
> >
> >> hello again
> >>
> >> i improved guenter's bandlimited square a bit. i noticed that it is
> >> hardcoded to 48kHz and accidently i was running pd at 48kHz, that's why
> >> it sounded quite good here. however, how far i can see it, the part,
> >> that selects the appropriate table, is not working as it should. i
> >> couldn't completely follow, how it works, but it seems to switch only
> >> correct from tab1 to tab2. for other tabs it switches at too high
> >> frequencies, which might introduce a bit aliasing.
> >> in my version the tables are generated on loadbang, which makes the file
> >> much smaller and easier to adapt for other waveforms. the tabselector is
> >> now dependent on the sampling rate, so it should sound well at different
> >> rates now.  in order to provide the full spectrum even in low
> >> frequencies, i added a raw square generator. below a certain frequency,
> >> the oscillator switches to the raw square version, so that it should
> >> sound good at arbitrary low frequencies. the number of tables generated
> >> on loadbang can be changed. a bigger value lowers the frequency, at
> >> which the oscillator switches to the raw version and vice versa.
> >>
> >> i hope you'll have fun with it.
> >>
> >> roman
> >>
> >>
> >> On Wed, 2007-03-14 at 04:46 -0600, David Powers wrote:
> >>
> >>> I found those, but are they really band-limited? I'm fairly sure I
> >>> hear ugly digital artifacts in the saw. The square appears to be
> >>> broken, unless I made a mistake cutting and pasting those 1500 lines
> >>> of code into my text editor (kinda hard to tell).
> >>>
> >>> It's 5 30 am here and I've not slept yet :-(
> >>>
> >>> I can't believe there's STILL no readily available
> >>> external/abstraction for such a common synthesis task, I just want a
> >>> "nice sounding" example that will compare with the VST's which I will
> >>> be hosting from within PD; right now "ASynth" sounds about 100x better
> >>> than anything made in PD itself ...
> >>>
> >>> Oh and I don't see any "J" example PD patches, my PD patches don't go
> >>> that high.
> >>>
> >>>  ~David
> >>>
> >>> On 3/14/07, Roman Haefeli <reduzierer at yahoo.de> wrote:
> >>>
> >>>> hello david
> >>>>
> >>>> i found examples for a bandlimited saw and bandlimited square by g.
> >>>> geiger in the archives. might this is what you are looking for.
> >>>>
> >>>> http://lists.puredata.info/pipermail/pd-list/2006-05/038681.html
> >>>>
> >>>> cheers
> >>>> roman
> >>>>
> >>>> On Wed, 2007-03-14 at 03:05 -0600, David Powers wrote:
> >>>>
> >>>>> Hello everyone,
> >>>>>
> >>>>> I tried google and it was no help, and the server for the list archive
> >>>>> seems to be down temporarily.
> >>>>>
> >>>>> Anyway, I'm giving a free (as in free beer) workshop in Chicago in
> >>>>> about 16 hours, on the basics of digital synthesis. I have decided to
> >>>>> use Pure Data to give my presentation, and use mostly non-commercial
> >>>>> software.
> >>>>>
> >>>>> However, I'm still missing the following for demonstrating "proper"
> >>>>> subtractive synthesis:
> >>>>> 1. Good, out of the box "analog-sounding" filters. I'm using [moog~]
> >>>>> right now, but I'm not all that satisfied with the sound compared to
> >>>>> the filters in my favorite VST's ...
> >>>>> 2. Band-limited square and sawtooth waveforms.
> >>>>>
> >>>>> For teaching purposes PD is great, and ideal for my demonstrations.
> >>>>> But as it is, I'm having to use VST's within PD in order to
> >>>>> demonstrate a "nice sounding" synth. It would be nice to show that PD
> >>>>> can do it without using stuff built in Steinberg's format. That would
> >>>>> also let the Mac people replicate my work, if they are interested.
> >>>>> Note, nobody in the workshop has ever tried Linux, except me, so Linux
> >>>>> plugins are not helpful in this case.
> >>>>>
> >>>>> I will post my patches after I give the workshop, though they are
> >>>>> nothing fancy ... just basic:
> >>>>> sequencer - oscillator - vca - filter. Good for demoing though, I'm
> >>>>> starting with additive first, then subtractive.
> >>>>>
> >>>>> ~David
> >>>>>
> >>>>> _______________________________________________
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> >>>>>
> >>>>
> >>>>
> >>>>
> >>>>
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> >>>>
> >>>>
> >>>>
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