[Csnd] Question about granular opcodes, synchronous vs asynchronous

ST_Music · April 16, 2023, 6:36pm

I'm trying to get a better handle on the granular opcodes, reading the FLOSS manual Chap. 05G

Is granule the only/primary opcode that can perform asynchronous granular synthesis, setting aside self-made granulators? Perhaps partikkel as well using the idisttab parameter? Some of the technical explanations in the manual for the opcodes are hard for me to decipher, a little over my head.

Scott

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joachim · April 16, 2023, 6:50pm

yes partikkel can do anything =)

i once did two UDOs for reducing the number of inputs. perhaps it is useful for you:

github.com

csudo/csudo/blob/master/grains/GrPtkSmpA.csd

/****************************************************************************
aout GrPtkSmpA ifiltab, iskip, kspeed, kgrainamp, kgrainrate, kgrainsize, kcent, kposrand, kcentrand, icosintab, idisttab, iwin
A simplified version of the Partikkel opcode, but with some additional parameters

A simplified version of the Partikkel opcode, but with some additional parameters. It performs asynchronous granular synthesis with a maximal displacement of 1/grainrate seconds.
written by joachim heintz

ifiltab - function table with the input sound file (usually with GEN01)
iskip - skiptime (sec)
icosintab - function table with cosine (e.g. giCosine ftgen 0, 0, 8193, 9, 1, 1, 90)
idisttab - function table with distribution (e.g. giDisttab ftgen 0, 0, 32768, 7, 0, 32768, 1)
iwin - function table with window shape (e.g. giWin ftgen 0, 0, 4096, 20, 9, 1)
kspeed - speed of the pointer
kgrainamp - multiplier of the grain amplitude (the overall amplitude depends also from grainrate and grainsize)
kgrainrate - number of grains per seconds
kgrainsize - grain duration in ms
kcent - transposition in cent
kposrand - random deviation (offset) of the pointer in ms
kcentrand - random transposition in cents (up and down) 
****************************************************************************/

This file has been truncated. show original

github.com

csudo/csudo/blob/master/grains/GrPtkSmpB.csd

/****************************************************************************
apartikkel GrPtkSmpB ifiltab, apnter, kgrainamp, kgrainrate, kgrainsize, kcent, kposrand, kcentrand, icosintab, idisttab, iwin
The same as PtkSmpA, but with a time pointer input

A simplified version of the Partikkel opcode, but with some additional parameters. It performs asynchronous granular synthesis with a maximal displacement of 1/grainrate seconds.
written by joachim heintz

ifiltab: function table with the input sound file (usually with GEN01)
icosintab: function table with cosine (e.g. giCosine ftgen 0, 0, 8193, 9, 1, 1, 90)
idisttab: function table with distribution (e.g. giDisttab ftgen 0, 0, 32768, 7, 0, 32768, 1)
iwin: function table with window shape (e.g. giWin ftgen 0, 0, 4096, 20, 9, 1)
apnter: pointer into the function table (0-1)
kgrainamp: multiplier of the grain amplitude (the overall amplitude depends also on grainrate and grainsize)
kgrainrate: number of grains per seconds
kgrainsize: grain duration in ms
kcent: transposition in cent
kposrand: random deviation (offset) of the pointer in ms
kcentrand: random transposition in cents (up and down) 
****************************************************************************/

This file has been truncated. show original

joachim