On Friday 20 June 2003 14:37, julien.breval@tremplin-utc.net wrote:
hi julien,
creb (http://zwizwa.fartit.com/pd/creb) has some extra objects to do spectral synthesis, with the ability to do separate pitch and timbre synthesis using the dynwav~ object.
dynwav is like tabread~, only it uses a dsp buffer as the wave table. you can set it's size using the block~ object. this is not really necessary, but it eliminates the need to use an array. it also interpolates between 2 successive buffers, so you don't need to care about overlap adding either.
there are some other objects you can use
- diag~ and bdiag~: diagonal and block diagonal state space systems, to
generate spectral data.
- bfft~ / ibfft~: a (normalized) (i)fft with a different data ordering than
pd's rfft~: (DC, NY, 1R, 1I, 2R, 2I, ...) the different ordering works better with diag~ and bdiag~. (if you combine bdiag~ with ibfft~ you get a form of scanned synthesis / additive synthesis hybrid). also, if you send a continuous signal (i.e a sine) as a spectrum, this ordering is easier to use if you don't care to much about the phase of the sines.
- dwt~ / idwt~: periodic biorthogonal interpolating wavelets. can be used
instead of fft to build the spectra.
- fblock / tblock: these are abstractions to create spectra using osc~ or
phasor~ or similar objects. it enables you to set the number of oscillations in a buffer and the shift (drift) of the waveform independently. i.e. to construct a comb filter effect.
hope this is useful,
tom
Hi everybody
( I have just suscribed to this mailing list. I have used Pure Data for about 4 months (and GEM sometimes), for various applications, under Linux and Windows. )
I have a question about spectral synthesis.
I saw a patch (in Miller Puckette's book, " Theory and Techniques of Electronic Music ") that performs spectral synthesis like this : there is a bank of sine oscillators, and the amplitude of each sine is controlled by a graphic array.
I tried to do this a bit differently before, using rifft~ and a graphic array. The idea was to resynthesize a sound from spectral data directly drawn in the array, unfortunately it didn't work. Maybe rifft~ works with rfft~ only ? I started from a classic analysis / resynthesis patch and used the resynthesis only.
Has anyone managed to do (re)synthesis (without any actual analysis : the result of the analysis is drawn directly in an array) with rifft~ ?
Thank you very much
Julien
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