| hi claude,
your bandlimited project works/sounds great! very nice sounds from handdrawn waves.
however i am having trouble getting your example to work. probably just stupidity from my side.
i suppose i don’t understand your:
"set appropriate block size, turn off dsp, bang to execute 1 block”
message. if you find the time, can you have a look at it?
do i not need to run a bang into tabplay in this special one block send scenario?
with my patch i get “kind" of the right thing.
1) the table “spectrum” only updates once i click into the table (after i hit the bang). 2) i get only 64 values, so i guess my blocksize is still 64? 3) if i send a bang to switch~ when dsp is off, i get an error on the console:
bang to block~ or on-state switch~ has no effect.
cheers
|
wavetablefft.pd
Description: Binary data
Hi Simon,On 04/08/16 09:54, Simon Iten wrote:ah sorry, yes
i want to read a wavetable, say 128 steps and calculate the gain structure to aproximate this wavetable with sine waves.
the idea behind this is to get a different sound from wavetables, use low resolution wavetables to get nice sounds (waldorf microwave xt)
so for a saw wave i would want the following numbers.
1 0.5 0.3333 0.25 0.2 and so on…
how to do this for an arbitrary input wavetable?
i looked at the fft examples but it is not clear to me how i would do this with a single wavetable (of known size)
You could do something like this with [rfft~], but you lose phaseinformation which might be important depending on what you are doing(use fixed-width font to see diagram):"set appropriate block size, turn off dsp, bang to execute 1 block"
|
[switch~]
[tabplay~ wavetable]
|
[rfft~ ]
^ ^
[*~] [*~]
\ /
[+~]
|
[sqrt~]
|
[tabsend~ spectrum]or if there is a “simpler” (without fft) possibility that would be great.
I don't think you'll get simpler than FFT here. As a bonus you can alsoget phase information (sinesum has all phases 0, cosinesum all phasespi/2, general wavetable can have arbitrary phases).You could use [rifft~] instead of sinesum to generate your wavetable,too. Note there may be some issues with normalization (fft->ifft has anamplitude gain equal to the blocksize, iirc).For a more advanced use of oneshot FFT and IFFT for wave tables, see mybandlimited project:https://mathr.co.uk/blog/2015-02-12_bandlimited_wavetables.htmlClaude-- https://mathr.co.uk_______________________________________________[email protected] mailing listUNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list
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