Spectral envelope drawing [was: [PD] graph on parent]

[Miller Puckette]

It's not the same approach, but there's a simple spectral-envelope-drawing
example in

http://man104nfs.ucsd.edu/~mpuckett/172.01s/week1/

in 02_draw_spectrum.pd and the abstraction osc-voice.pd ...  I'll
think about cleaning it up to stick in the example patches.

Another possible approach is to use the envelope as a filter; rfft~ any
signal, multiply right and left outputs by the "tabreceive", recombine
via rifft~.

I don't think that directly synthesizing from the desired FFT spectrum
will work very well, but you could try it by just sticking the tabreceive~
straight into the left-side input of the rifft~...

cheers
Miller

On Wed, Jan 30, 2002 at 11:01:21PM +0100, Frank Barknecht wrote:
> hi all,
> 
> Miller Puckette hat gesagt: // Miller Puckette wrote:
> 
> > I agree.  Spectral envelope drawing, anyone?
> 
> Yes, I'm playing with this. And while this is brought up, I have a probably
> simple question, which does bother me anyway:
> 
> Say I want to make an additive synthesis instrument, that generates
> its sound by an rifft~ object. This object should receive information
> about the magnitude of certain frequencies. This should be done with a
> (drawable) array, where the x axis is frequency and y is magnitude. The
> array gets read by a tabreceive~ and has a size = window blocksize. Now:
> How do I have to preprocess this xy-axis data to let rifft~ generate the
> matching sound composed of the input frequencies. 
> 
> Any hints? 
> 
> [I have some understanding of the FFT, but for this problem I just don't
> get a solution. Call me stupid.]
> 
> Ciao,
> -- 
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