Adobe AUDITION 1.5 - Manual (Page 60)

CHAPTER 2 52
Setting up Adobe Audition
Dither Transform Results (increases dynamic range) Enables dithering when processing
effects such as FFT Filter or Amplify. Most processing done by Adobe Audition uses arith-
metic greater than 16-bit, with the results converted back to 16-bit when complete. During
this conversion, dithering provides a higher dynamic range and cleaner results, with less
distortions and negative artifacts. With dithering, you get almost 24-bit sample perfor-
mance in only 16 bits, as the dynamic range is increased by another 10 dB or so, allowing
signals as quiet as –105 dB.
If this option is disabled, the results are truncated to 16 bits when converting back, thus
losing the more subtle information.
When enabled, the addition of dither retains this subtle information. The drawback is that
with each operation a small amount of white noise is added at the quietest volume level.
However, the trade-off between using dither (thus adding noise) and truncating the data
(thus creating artifacts and correlated quantization noise) generally favor using dither, so
it’s best to leave this option enabled.
Use Symmetric Dithering Enables symmetric dithering. In most cases, it’s best to leave
this option selected. If unselected, a DC offset of one-half sample is added each time data
is dithered. Symmetric dithering has just as many samples added above zero as below zero.
By contrast, nonsymmetric dithering just toggles between 0 and 1. Sometimes in a final
dither, this may be desired to reduce the bit range of the dither. However, both methods
produce identical audible results in every respect.
Smooth Delete And Cut Boundaries Smooths Cut and Delete operations at the splicing
point, preventing audible clicks at these locations.
Smooth All Edit Boundaries By Crossfading Automatically applies a crossfade to the
starting and ending boundaries of the selection. This option smooths any abrupt transi-
tions at these endpoints, thus preventing audible clicks when filtering small portions of
audio. You can enter a value (in milliseconds) in the crossfade time box to specify the
crossfade duration to be applied.
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