been working on a toolbox and want to make also an 8bit sound effect. is there any easy way to do this stuff?
256 [vcf~] objects are really a lot and i hope there is a much more comfortable way to realize an 8 bit sound. The best way would be also to manipulate the frequence and the bitrate.

thanks a lot

addisaden

These techniques aren't unique to pd, the SH process is used a lot in modular synths.

thanks a lot

Take a 16-bit signal, divide by 512, multiply by 512 -> only 8 bits of resolution preserved, right? (analogously to shrinking and re-enlarging a pixel image)

This won't work as pd's floating point magic will leave the signal (almost) unchanged.
(also in the image analogy, shrinking would be more like downsampling, and 8bit-sound would compare to reduced color depth)
you'll need something like this to actually "clip the bits"

[*~ BD]
| \
| [wrap~]
| |
[-~]
|
[/~ BD]

from discussion here
http://lists.puredata.info/pipermail/pd-list/2008-12/066923.html

searching for bitcrusher here and on the list will give you lots of options

This won't work as pd's floating point magic will leave the signal (almost) unchanged.
(also in the image analogy, shrinking would be more like downsampling, and 8bit-sound would compare to reduced color depth)
you'll need something like this to actually "clip the bits"

[*~ BD]
| \
| [wrap~]
| |
[-~]
|
[/~ BD]

from discussion here
http://lists.puredata.info/pipermail/pd … 66923.html

Using expr~, you just convert to in after you've multiplied your signal. Then divide that int by the original multiplier to get back between -1 and 1, with the bit depth you desire.

Edit, added a demonstration patch to this reply.

http://www.pdpatchrepo.info/hurleur/bitcrusher.pd