[PD] efficient bank of sines
tomerbe at san.rr.com
Wed Dec 10 02:57:46 CET 2003
thanks for all the good ideas... i will actually be writing an external
tonight based on the table->rifft->tablelookuposc idea, as i think that
will give me the best performance (and i do want frame-based control
over all of the partials).
On Dec 9, 2003, at 4:21 AM, Johannes Taelman wrote:
> > On Monday 08 December 2003 12:52 pm, Tom Erbe wrote:
> >>what's the opinion of the list as the most efficient method to make a
> >>large bank of harmonically related sines (say 50-200 partials)? is it
> >>just a group of osc~, or phasor~ or something else entirely?
> All really depends on how much control you want over it.
> If you only need to change the fundamental pitch and overall
> amplitude, you just need to implement a wavetable synth, and generate
> the appropriate wavetable, like Ben describes. Could also be done with
> the sinesum (?) message to an array.
> If you need frame-based control over the individual amplitudes, you
> can do the overlap-add ifft-synthesis with block~ and rifft~.
> If you need to change the spectrum only once in a while, you can put
> the rifft~ and tabsend~ in a subpatch. Switch~ it off with bang~, so
> it runs only once each time you switch~ it on.
> An improved version of this uses multiple wavetables and crossfades
> between them so that there are no clicks when changing the spectrum.
> If audio-rate control over the individual amplitudes and/or pitches is
> required, you'll need osc~'s and a fast computer.
> Correct me if I'm wrong somewhere.
> BTW: Are those guard points still required for correct use of
> tabread4~? How can we generate them elegantly when not generating the
> wavetable with sinesum?
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tom erbe . soundhack
608 carla way . la jolla . ca . 92037
http://www.soundhack.com . soundhack at san.rr.com
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