[PD] editing pd silence - dither
matju at artengine.ca
Sun Oct 23 22:04:58 CEST 2011
Le 2011-10-23 à 11:36:00, Marvin Humphrey a écrit :
> In that image, the "24-bit gradient" would be analogous to the full
> width audio signal prior to bit depth reduction, the "8 bit gradient,
> dithered" would be analogous to dithered audio, and the "8 bit gradient"
> displaying obvious color banding would be analogous to truncated audio.
I understand all of that already, but my impression is that it's more like
making a 24-bit gradient use dithering so that it looks more like a 48-bit
gradient. Would it make a perceptual improvement if you did so ?
I recall that the audio dithering technique worked really great on
PC-Speakers running on a 1-bit DAC (it's called an on/off switch). But
that's because it used only a 1-bit device. If the device already has 16
bits, it takes silly mistakes to emphasise the truncation error so much
that it can be heard.
E.g. if you have a fully 16-bit-digital volume control on an amp, and the
amp has a big volume range and you only use the quiet range, the effective
number of bits can down a lot.
| Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC
More information about the Pd-list