[PD] table resampling, WAS : sinesum inverse

[cyrille henry]

hello,

i'm also very interested in artefact free and band limited table reading.

(my work is in the nusmuk-audio svn folder, you will find there tabosci~ that implement a naive anti aliasing filter using table as oscillator).

The best algorythm i found so far to get an alias free, band limited table reading is this one :
https://ccrma.stanford.edu/~jos/resample/resample.pdf
but i did not had time to implement it in pd.

I would be glad if someone want to do it before me.

cheers
cyrille



Le 05/08/2016 à 00:04, Claude Heiland-Allen a écrit :
> Hi Simon, list,
>
> On 04/08/16 22:51, Simon Iten wrote:
>> hi claude,
>>
>> your bandlimited project works/sounds great! very nice sounds from handdrawn waves.
>
> thanks!
>
>>
>> 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?
>
> sure, just a [loadbang]--"0"--[switch~] - this turns off dsp for the
> canvas (so you might want to put it all in a subpatch unless you're
> using it as an abstraction).  see attached, works for me
>
>>
>> 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).
>
> mm, seems to be a Pd bug or other infelicity.  the attached includes a
> workaround using [tabwrite] which updates the GUI
>
>> 2) i get only 64 values, so i guess my blocksize is still 64?
>
> no, it's that for real signals the second half of the rfft~ output is
> symmetric to the first, so Pd sets it to 0 and ignores it in rifft~ to
> avoid confusion.
>
>> 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.
>
> you have to switch it off with "0" first, and have global dsp on (afaik).
>
>>
>>
>>
>> cheers
>
> hth,
>
>
> Claude
>
>
>
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