[PD] Simple Subtractive Synth

[Roman Haefeli]

On Wed, 2010-11-24 at 17:06 +0100, Derek Holzer wrote:
> Hi Samuel,
> 
> probably the bandlimited oscillator BLOSC objects in the creb library, 
> or the spliced-transition method found in the Pd help files or Miller's 
> book would be the best things, however I have also included a chapter in 
> the FLOSS Manual on using the "sinsum" message to create rudimentary 
> waveforms:
> 
> http://en.flossmanuals.net/PureData/GeneratingWaveforms
> 
> They are bandlimited, however they still alias at higher frequencies. 
> Combining them with oversampling could also be an interesting idea:
> 
> http://en.flossmanuals.net/PureData/Antialiasing
> 

> 
> On 11/24/10 4:50 PM, samuel rowe wrote:
> 
> > band-limited waveforms (using fourier synthesis, then writing this into
> > a table)


This is the approach those abstraction use:
https://github.com/reduzent/pd-bloscabs

And unlike what Derek stated, this does _not_  necessarily produce
aliasing artefacts. The abstractions from bloscabs use sinesum tables
dependent on the incoming frequency. So they are completely
aliasing-free there is no need for oversampling or such. 

In fact, the [creb/blosc~ saw] produces (not very loud, though) aliasing
artefacts.

The spliced-transition method is particularly interesting for making
anti-aliased pulse waveforms  with dynamically adjustable pulse width.


Roman