VST plugin for Mac OS 9, Mac OS X and Windows
by Tom Erbe and Akira Rabelais
+decimate is a VST plug-in which performs simple bit-depth reduction
and sample-rate
reduction. This produces sounds with less resolution and more sampling
artifacts(decimation
noise and sample rate aliasing) than the original.
There are only two parameters in +decimate, "DEPTH" and "AVERAGING".
They
are both controlled by horizontal sliders.
"DEPTH" controls the bit depth, and is variable from 1 to 32 bits. Reducing
the
bit depth is somewhat like hard clipping. A low bit depth will produce
harmonic
distortion. The scale is continuous and exponential with 5 bits near
the center of
the range.
"AVERAGING" controls the sample rate reduction, and does so by averaging
adjacent sampleswith no further anti-aliasing filtering. Because of
this, this filter
produces lots of high frequency aliasing noise. The scale is in power
of two steps
from 1 to 256 samples. A 256 sample averaging of a 44100 sample rate
produces
a sound with a sample rate of 44100/256 or 172.26 samples per second.
+decimate is a free plugin from http://www.soundhack.com.
It was originally
released without any GUI on September 18, 2001 then considerably altered,
and
ported to OS X and Windows for a December 27, 2001 release.
If you have any questions, email me at the address below:
Tom Erbe
lobata@earthlink.net