[Fluxus] Output of 'gh'

Scott alcoholiday at gmail.com
Fri May 22 10:46:55 PDT 2009


I think the name Harmonic is what's confusing. My understanding is
that it's just a "frequency band".

That said - it might be cool to support some alternate ways of binning
the fft data.

On Fri, May 22, 2009 at 2:30 AM, Janosch Peters <petersj at in.tum.de> wrote:
> Hi Gabor,
>
>> fluxus sums up the results of the fft calculation in 16 fft
>> bins. as far as i know, it calculates the fft for the buffer size you
>> specify in start-audio, then sums up the neighbouring values
> according
>> to a non-linear mapping table, which specifies for example that the
>> 9thharmonic will be calculated by summing up the bands between 28 and
>> 40.
>
> Ok so that means we have a fixed relation between frequencies and
> harmonics, e.g. a sine pitch of 440hz will always be assigned to the
> very same harmonic. So it might look like this:
>
> frequency(-band)        harmonic
> 25...50...75        0
> 50...100..150       1
> 100..200..300       2
>
> Here the fundamental frequency is 50hz. I guess frequencies far away
> from the frequency band center are weighted less?
>
> I recognized that "centering" frequencies within their frequency band
> would mean that the frequncie bands are overlapping, correct?
>
> And whats the purpose of assigning multiple frequncie bands to one
> harmonic? Wouldnt be a 1:1 relation ship (as in the example) enough?
>
> Sorry for asking so many questions, but Im going to give a presentation
> about fluxus, and I'd like to know a bit what Im talking about. :-)
>
> cheers,
> Janosch
>
> --
> I'm trying a new usenet client for Mac, Nemo OS X, since 0 days.
> You can download it at http://www.malcom-mac.com/nemo
>
>


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