Band limited saw,tri,sq oscillators?

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Band limited saw,tri,sq oscillators?

Postby tor on Wed Jun 06, 2012 9:31 pm

Is it even possible to make it in SM with out wavetables or heavie CPU load. I think the stock osc's are good. But I want to learn how to make it myself. I have no problem making band limited osc with multiple sine osc's but this drains the computer for CPU.

Some hints are very much appreciated. How are the stock osc's made?
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Re: Band limited saw,tri,sq oscillators?

Postby stw on Wed Jun 06, 2012 10:14 pm

maybe THIS thread is interesting for you.
SM OSCs are wavetables.
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Re: Band limited saw,tri,sq oscillators?

Postby tor on Wed Jun 06, 2012 11:39 pm

Thanks :)

I also just found this article and got more optimistic regarding wave tables. ;)
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Re: Band limited saw,tri,sq oscillators?

Postby infuzion on Mon Jun 11, 2012 9:47 pm

stw wrote:SM OSCs are wavetables.
IIRC, only 2 are, & it seems optimized for those forms. Pure sine does not need BL, since it has no harmonics ;)
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Re: Band limited saw,tri,sq oscillators?

Postby oddson on Tue Jun 12, 2012 12:20 am

infuzion wrote:
stw wrote:SM OSCs are wavetables.
IIRC, only 2 are, & it seems optimized for those forms. Pure sine does not need BL, since it has no harmonics ;)
True sine waves don't need band-limiting... but my recollection is that SynthMaker still uses wavetables for them.
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Re: Band limited saw,tri,sq oscillators?

Postby infuzion on Tue Jun 12, 2012 1:44 pm

What WT files are in the folder after running SM? That will solve the mystery.
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Re: Band limited saw,tri,sq oscillators?

Postby DonnaHoward on Thu Jun 14, 2012 10:54 am

I have a question. if i use a bandlimited sawtooth wave oscillator to make another waveforms, these latter will be anti aliased too ?
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Re: Band limited saw,tri,sq oscillators?

Postby MegaHurtz on Thu Jun 14, 2012 11:09 am

No. But thats hardly a problem.
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Re: Band limited saw,tri,sq oscillators?

Postby infuzion on Thu Jun 14, 2012 2:28 pm

& welcome to SM Donna!
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Re: Band limited saw,tri,sq oscillators?

Postby trogluddite on Thu Jun 14, 2012 4:52 pm

Welcome to the forum,

DonnaHoward wrote:I have a question. if i use a bandlimited sawtooth wave oscillator to make another waveforms, these latter will be anti aliased too ?

This depends what method you use to make the new waveform. Generally, if you are just adding (mixing) waveforms together, they will remain ant-aliased. However, if you use frequency modulation, phase modulation etc. there will be some aliasing - though it will be less than if you started out with aliasing oscillators to begin with.
Feel free to use any schematics and algorithms I post on the forum in your own designs - a credit is appreciated (but not a requirement).
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