[PD] sinesum inverse

Simon Iten itensimon at gmail.com
Thu Aug 4 10:54:34 CEST 2016


ah sorry, yes

i want to read a wavetable, say 128 steps and calculate the gain structure to aproximate this wavetable with sine waves.
the idea behind this is to get a different sound from wavetables, use low resolution wavetables to get nice sounds (waldorf microwave xt)

so for a saw wave i would want the following numbers.

1 0.5 0.3333 0.25 0.2 and so on…

how to do this for an arbitrary input wavetable?

i looked at the fft examples but it is not clear to me how i would do this with a single wavetable (of known size)

or if there is a “simpler” (without fft) possibility that would be great.


> On 04 Aug 2016, at 10:05, José Rafael Subía Valdez <jsubiavaldez at gmail.com> wrote:
> 
> Can you elaborate a bit what you want to do??
> 
> I think you better process the table rather than go from one domain to another.
> 
> inverse the phase by multiplying by -1,
> you can "reverse" the table by reading it from back to front.
> 
> 
> 
> On Thu, Aug 4, 2016 at 8:53 AM, Simon Iten <itensimon at gmail.com <mailto:itensimon at gmail.com>> wrote:
> sorry to post again.
> 
> i think sigmund~ can do this.
> 
> but i would be thankful for a hint how to calculate it. if it’s fft, then some insight how to use fft on a single wavetable would be very nice.
> 
> > On 04 Aug 2016, at 09:34, Simon Iten <itensimon at gmail.com <mailto:itensimon at gmail.com>> wrote:
> >
> > dear list,
> >
> > i can create nice wavetables with sinesum.
> >
> > what would be the easiest process to do the inverse?
> >
> > reading a wavetable of known size and converting it to it’s sine harmonics gain structure.
> >
> > fft? i am a little bit lost on how to do this with a wavetable.
> >
> > or is there a simpler way if i know the number of points and the range of the waveform?
> >
> > cheers
> 
> 
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> 
> -- 
> José Rafael Subía Valdez
> www.jrsv.net <http://www.jrsv.net/>
> 
> 
> 
> 

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