Hi HC,
Hans-Christoph Steiner wrote:
I should say, I forgot that PWM was used in synthesis some, so I was thinking about electronics and control when I was talking about PWM. That's why my PWM objects are tailored towards, but should work fine in the audio context too, unless you need the wandering DC offset.
But this is still not bandwidth-limited, is it? So it's use for audio would also be limited to situations where either you would use the PWM for controlling a "proper" audio oscillator, or where you don't really give a scheiss about aliased frequencies and audio birdies.
I haven't checked your [square~] yet, but if it is antialiased it would fill a big missing void in PD's audio arsenal.
Otherwise, I still suggest to use the BLOP plugins for LADSPA with [plugin~], which sound about as real as you can get, but still only seems to work under Linux.
best, d.
Hi,
nothing to do with PWM, but attached is a bandlimited square and saw implementation, based on the BF algorithm used in the BLOP plugins, written in Pd only. The Pd documentation also has suggestions using a BLEP (band limited step function).
The good thing about Pd is that you do not have to look for plugins that do the work, you can build them yourself using Pd's basic building blocks. I also have a BLIT (band limited impulse train) implementation of the square wave lying around, and an implementation using integrated wavetables. You can even do oversampling within Pd, so nothing really keeps you from having bandlimited oscillators .. except that it takes time an knowledge to build them.
Günter
PS: the oscs need a great amount of tweaking and/or more tables. something to be done for the next version, but the idea should be clear.
On Thu, 25 May 2006 derek@x-i.net wrote:
Hi HC,
Hans-Christoph Steiner wrote:
I should say, I forgot that PWM was used in synthesis some, so I was thinking about electronics and control when I was talking about PWM. That's why my PWM objects are tailored towards, but should work fine in the audio context too, unless you need the wandering DC offset.
But this is still not bandwidth-limited, is it? So it's use for audio would also be limited to situations where either you would use the PWM for controlling a "proper" audio oscillator, or where you don't really give a scheiss about aliased frequencies and audio birdies.
I haven't checked your [square~] yet, but if it is antialiased it would fill a big missing void in PD's audio arsenal.
Otherwise, I still suggest to use the BLOP plugins for LADSPA with [plugin~], which sound about as real as you can get, but still only seems to work under Linux.
best, d.
-- derek holzer ::: http://www.umatic.nl ---Oblique Strategy # 177: "What is the reality of the situation?"
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Hallo, geiger hat gesagt: // geiger wrote:
nothing to do with PWM, but attached is a bandlimited square and saw implementation, based on the BF algorithm used in the BLOP plugins, written in Pd only. The Pd documentation also has suggestions using a BLEP (band limited step function).
That's phat!
Ciao
Frank Barknecht _ ______footils.org_ __goto10.org__
Even better would be to have a library of very handy objects like
these written in Pd. Then you wouldn't have to spend years learning
digital audio to write your own. Instead you could use ones that
have been finely tuned and debugged. And if you were interested, you
could open them up and see how its done.
.hc
On May 26, 2006, at 4:27 PM, geiger wrote:
Hi,
nothing to do with PWM, but attached is a bandlimited square and saw implementation, based on the BF algorithm used in the BLOP plugins, written in Pd only. The Pd documentation also has suggestions using
a BLEP (band limited step function).The good thing about Pd is that you do not have to look for plugins
that do the work, you can build them yourself using Pd's basic building
blocks. I also have a BLIT (band limited impulse train) implementation of the square wave lying around, and an implementation using integrated wavetables. You can even do oversampling within Pd, so nothing really keeps you from having bandlimited oscillators .. except that it
takes time an knowledge to build them.Günter
PS: the oscs need a great amount of tweaking and/or more tables.
something to be done for the next version, but the idea should be clear.On Thu, 25 May 2006 derek@x-i.net wrote:
Hi HC,
Hans-Christoph Steiner wrote:
I should say, I forgot that PWM was used in synthesis some, so I was thinking about electronics and control when I was talking about PWM. That's why my PWM objects are tailored towards, but should work
fine in the audio context too, unless you need the wandering DC offset.But this is still not bandwidth-limited, is it? So it's use for audio would also be limited to situations where either you would use the
PWM for controlling a "proper" audio oscillator, or where you don't really
give a scheiss about aliased frequencies and audio birdies.I haven't checked your [square~] yet, but if it is antialiased it
would fill a big missing void in PD's audio arsenal.Otherwise, I still suggest to use the BLOP plugins for LADSPA with [plugin~], which sound about as real as you can get, but still
only seems to work under Linux.best, d.
-- derek holzer ::: http://www.umatic.nl ---Oblique Strategy # 177: "What is the reality of the situation?"
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/ listinfo/pd-list <blsaw.pd> <blsquare.pd>
News is what people want to keep hidden and everything else is
publicity.
- Bill Moyers
On Fri, 26 May 2006, Hans-Christoph Steiner wrote:
Even better would be to have a library of very handy objects like these written in Pd. Then you wouldn't have to spend years learning digital audio to write your own. Instead you could use ones that have been finely tuned and debugged. And if you were interested, you could open them up and see how its done.
I agree ... one could start by going through the Pd documentation, extract the examples in there and wrap them into abstractions.
Günter
.hc
On May 26, 2006, at 4:27 PM, geiger wrote:
Hi,
nothing to do with PWM, but attached is a bandlimited square and saw implementation, based on the BF algorithm used in the BLOP plugins, written in Pd only. The Pd documentation also has suggestions using a BLEP (band limited step function).
The good thing about Pd is that you do not have to look for plugins that do the work, you can build them yourself using Pd's basic building blocks. I also have a BLIT (band limited impulse train) implementation of the square wave lying around, and an implementation using integrated wavetables. You can even do oversampling within Pd, so nothing really keeps you from having bandlimited oscillators .. except that it takes time an knowledge to build them.
Günter
PS: the oscs need a great amount of tweaking and/or more tables. something to be done for the next version, but the idea should be clear.
On Thu, 25 May 2006 derek@x-i.net wrote:
Hi HC,
Hans-Christoph Steiner wrote:
I should say, I forgot that PWM was used in synthesis some, so I was thinking about electronics and control when I was talking about PWM. That's why my PWM objects are tailored towards, but should work fine in the audio context too, unless you need the wandering DC offset.
But this is still not bandwidth-limited, is it? So it's use for audio would also be limited to situations where either you would use the PWM for controlling a "proper" audio oscillator, or where you don't really give a scheiss about aliased frequencies and audio birdies.
I haven't checked your [square~] yet, but if it is antialiased it would fill a big missing void in PD's audio arsenal.
Otherwise, I still suggest to use the BLOP plugins for LADSPA with [plugin~], which sound about as real as you can get, but still only seems to work under Linux.
best, d.
-- derek holzer ::: http://www.umatic.nl ---Oblique Strategy # 177: "What is the reality of the situation?"
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/ listinfo/pd-list <blsaw.pd> <blsquare.pd>
News is what people want to keep hidden and everything else is publicity.
- Bill Moyers
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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Hans-Christoph Steiner