Waves L2—UltraMaximizer Handleiding

Waves Niet gecategoriseerd L2—UltraMaximizer

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Waves L2 software guide page 1 of 18
L2—UltraMaximizer
Software audio processor
User's Guide
Waves L2 software guide page 2 of 18
Chapter 1 - About the L2
The L2-Ultramaximizer is the third-generation software processor, combining
an advanced peak limiter, level maximizer and a high performance re-
quantizer and dithering system called IDR (Increased Digital Resolution). In
addition, the L2 software processor includes Waves' ARC Auto-Release
Control system, and ninth-order noise-shaping in the IDR implementation.
Processing in the L2 is 48-bit (double precision) processing, offering
improvements for all resolutions, and the opportunity to dither to a 24-bit
output for archives and DVD. The L2 offers superb requantization for all bit-
depths, including 24, 22, 20, 18, and 16-bit outputs. The development of L2’s
lookahead peak limiter provides the mastering engineer with the capability to
increase sound file resolution and production master levels with precise
control and dithering options.
Waves IDRâ„¢ process brings more choices, greater control, and unmatched
compatibility to the mastering environment, whether for high-resolution CD or
low-resolution multimedia. IDR offers two dither types and three noise-
shaping curves for optimal processing in a wide variety of applications and
with a wide choice of source material.
While the operation of conventional limiters is well understood, the limiter
section of the L2-Ultramaximizer is capable of a very fast, overshoot-free
response, and once the limiter threshold has been set, the user can then go
on to define the actual peak level that the processed signal will reach. Once
set, limiting and level re-scaling becomes a one-shot process.
For mastering purposes, the peak level of the processed signal would
normally be set to 0dB, or just below 0dB. Because a typical digital audio file
of music contains many high intensity, short duration peaks, simple
normalization of the file may still result in a low average signal level. Using the
L2-Ultramaximizer however, it is generally possible to significantly increase
the average signal level of a typical audio file without introducing any audible
side effects. In the event that a deliberately limited sound is required however,
there is more than adequate range of the limiter parameters to recreate
‘vintage’ effects such as level pumping or severely limited dynamic range.
The Ultramaximizer is specifically designed for mastering, digital editing,
multimedia, and any application that requires limiting and/or requantization of
the digital signal with highest quality. In order to ensure the maximum possible
resolution of a processed signal, it is very highly recommended that the L2 be
used last in the processing chain. Failure to observe this will not prevent L2
from working, but you should be aware that both the absolute brickwall limiting
AND the benefits of IDR requantization will be compromised and will need re-
limiting to maintain the original level.
The L2 is available as a stereo processor only. It will not show under mono
inserts and to process mono data you will have to make it stereo or bus it to a
stereo Auxiliary input.
Waves L2 software guide page 3 of 18
Chapter 2 - Some secrets of digital audio
In order to make the best use of the L2-Ultramaximizer, it is important that we
explain some of the less obvious implications of digital audio. Once these
have been explained, you will understand why Waves thought a product
such as L2 was necessary and you will be a in a better position to make use
of its powerful features. The operation of the L2 breaks down into two main
areas:
1 - maximum level of the digital signal through proprietary peak control.
2 - maximum resolution of the signal through dithering and noise-shaping.
ABOUT MAXIMUM LEVEL
The maximum level of a digital signal is governed by the highest peak in the
file. Simple normalization finds the highest peak, then raises the entire signal
so that this peak is at the maximum value. However, many of these peaks
may be of very short duration and can usually be reduced in level by several
dBs with minimal audible side effects. Those familiar with digital editing
systems may even have proved this for themselves by ‘redrawing’ some
trouble-some peaks by hand. By transparently controlling these peaks, the
entire level of the file can be raised several more dB than by simple
normalization resulting in a higher average signal level.
The L2-Ultramaximizer avoids the possibility of overshoot by utilizing a
lookahead technique that allows the system to anticipate and reshape signal
peaks in a way that produces the bare minimum of audible artifacts. Because
there is no possibility of overshoot, L2 can be used with absolute confidence
in situations where brickwall limiting is important.
ABOUT MAXIMUM RESOLUTION
Any digital signal processing that alters the original digital data (mixing, gain
changes, EQ, dynamic processing, etc.) generally increases the number of
bits required to represent the signal. Conventional truncation results in a loss
of signal-resolution each time the signal is processed. The human ear uses
this low level information to construct a mental image of the stereo
soundstage, so any compromise in this area manifests itself as a loss of
spaciousness and transparency. Waves’ IDR prevents this loss of critical low-
level detail. Even when processing 16-bit signals, it is normal to process with
at least 24 bits resolution, or more (as in the L2, which is now double-
precision). However, as soon as the resolution is pulled back down to 16 bits
by rounding or truncation (by removing the bottom 8 bits), the resulting
rounding error produces an audible distortion at low signal levels, and a
permanent loss of digital resolution that can never be recovered. If the audio
signal is repeatedly processed and truncated back to 16 bits, the losses
accumulate, causing a significant loss of fidelity, most evident as a loss of the
tonal subtleties of low-level sounds within a mix. The human ear uses such
low level information to construct a mental image of the stereo soundstage, so
any compromise in this area manifests itself as a loss of spaciousness and
transparency.
The solution is to properly dither and noise-shape a signal each time the
wordlength is increased then reduced (such as nearly every digital signal
process will require).

Product specificaties

Merk: Waves
Categorie: Niet gecategoriseerd
Model: L2—UltraMaximizer

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