L3-LL User Manual
25
Dithering and Noise Shaping
ing are two in
plementary techniques tha
rove the
udio after it
antized. Each technique is
nsible for the
ferent subjective quality of the noise caused by re-quantization.
Dithering alters the character of the qu
more closely resemble analog hiss, rather
l quantization noise. The m
ng is to
the quantization noise and th
hus minimizing the non-lin
istortion effects
of digital quantization noise. Th
s replaces the non-linear
tion sound with
r, less displeasing analog-hi
Noise Shaping psycho-acoustical
of overall noise energy across the
spectrum, by taking into account th
hich the ear is mo
ise
reases noise level in the 1-6
, a range to which the ear is se
e, while
noise level in the frequency range above 15 kHz to which the ear is les
itive.
ithering and noise sh
aracter and frequency content of noise,
to ou
Here’s how Dithering and Noise Shaping help maintain 3 more bits of detail: Our brains are capable of
perceiving details that are lower than the noise floor. Since quantization noise is correlated to the
signal, it effectively masks the signal
is correlation by inserting random signals,
allowing our brain to distinguish signal from noise and thus perceive low level details. Noise shaping
adds even more detail by shifting noise
le range, away from the desired signal.
IDR
™
Dither Options
ype1
ype 1 is a wide-band dither. Type1 adds a certain amount of noise, causing a 5dB increase in
ackground noise. It completely eliminates low-level distortion and signal-dependent modulation
effects. The result is a very transparent and clean low-level sound with a high resolution. It most
resembles the steady low-level hiss of an excellent quality analog system with no digital quantization
noise.
Type1 delivers no nonlinear distortion or modulation noise at low levels, and generates minimal side
effects when used with stereo signals. It is the recommended choice for high quality mastering
applications. By combining level maximization and IDR™ processing, 16-bit audio created from 20 or
24-bit masters have an apparent resolution of 19 bits. This is an improvement of more than 18dB.
Finally, unlike other dithering engines that are designed for single-stage CD mastering, IDR™ Type 1 is
optimized for use at every processing stage, allowing for subsequent signal processing.
Appendix B - IDR
™
In Depth
Dithering and Noise Shap
dependent, com
t imp
perceived quality of digital a
has been re-qu
respo
improvement of a dif
antization noise to
than digita
ain effect of ditheri
reduce or eliminate all correlation
between
e original signal, t
ear d
typical
e dithering proces
distor
steadie
ss type noise.
ly optimizes the distribution
e frequency ranges to w
st sensitive. No
Shaping dec
kHz range
nsitiv
increasing
s sens
In short, d
aping work by modifying the ch
r ears.
making it less displeasing
. Dithering breaks th
to a less audib
T
T
b
Summary of Contents for Multimaximizer L3-LL
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