----- Original Message ----- From: enrike@ixi-software.net To: pd-list@iem.at Sent: Friday, June 20, 2003 12:21 PM Subject: Re: [PD] pd & director

hi

...

I'm trying to develop a audio triggered video tool based on pd and

director for mac os x.

...

The idea so far is to let pd analyze and handle audio data and

communicate values to director, which controls the video output and sends control signals to pd.

there is aasfft xtra for director that does fast fourier transform on live audio-in , so maybe you dont need pd here (os-x version soon to be released), http://www.bonneville.nl/cps/ - another xtra with a lot of audio possibilities , looks like simplified pd more or less (150 euro unfortunatelly)

...

How good is Video performance with Macromedia Director?

I was developing an interactive instalation where video playback speed was controlled with live audio-in level and after testing pd + gem and director

• asFFT it turned out that director was better performance and more stable

than pd there. (everything on windoze)

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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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