D
D
ithe
ithe
r
r
The L1 provides three dither options:
None
No dithering occurs and the signal is truncated normally which provides significant non-
linear distortion at low levels.
Type1
Type1 dither adds some noise, causing a 5 dB increase in background noise compared to
the None setting, but completely eliminates all low-level distortion and signal-dependent
modulation effects. The resulting low-level signal is high resolution, transparent ,and
clean.
Type1 is the first technique optimized for every processing stage, allowing cascading and
subsequent signal processing. Type1 minimizes side effects with stereo signals.
We recommend using Type1 for 20- and 16-bit files and other high-quality mastering
applications. Combining level maximization (peak controlling) and IDR processing gives
16-bit files created from 20- or 24-bit masters the apparent resolution of 19 bits (an 18
dB improvement).
T
ype2
Type2 dither adds virtually no audible noise and is 5 dB quieter than Type1; it does add
some low-level distortion. This distortion, however, is lower than without dither. Type2 is
black with no input signal: there is no dither signal without input (also called auto-black-
ing dither). Type1 is a constant output signal dither noise, and is on even without input.
N
N
ois
ois
e S
e S
haping
haping
Noise shaping is a technique that shifts the noise frequency to a frequency range more diffi-
cult for the ear to perceive. This can both decrease the perceived amount of noise and
increase the perceived resolution.
The L1’s IDR section includes three noise-shaping options that shift the noise to frequencies
above 15 kHz, where our ears are least sensitive, and reduce the noise at lower frequencies.
The options differ in the amount of shifting imposed.
None
No noise shaping results in high audible hiss and distortion levels when used without
dither.
Moderate
The Moderate setting reduces perceived noise by about 6 dB and slightly reduces audible
distortion when dither is not used. The Moderate setting is appropriate for 8-, 12-, and
16-bit files.
Normal
The Normal setting reduces perceived noise by about 8.5 dB and slightly reduces audible
Y56K User Guide
39
To Next Page
Loading...
Need help?
General
