Spectral envelope drawing [was: [PD] graph on parent]
mpuckett at man104-1.ucsd.edu
Thu Jan 31 00:00:10 CET 2002
It's not the same approach, but there's a simple spectral-envelope-drawing
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
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~...
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.]
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