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The Oxford Limiter has been
developed from decades of professional audio experience to provide a very high
degree of quality and facility in programme loudness control and limiting
functions. By employing highly accurate logarithmic side chain processing, along
with innovative adaptive timing functionality using look ahead signal
acquisition, the limiter provides exemplary performance, whether one is seeking
general transparent level control, programme loudness maximisation or heavily
applied artistic sound effects.
Unique processing in the form of
the Enhance function provides the sample value limiting needed to reliably
avoid overloads in digital workstation environments and allows unprecedented
volume and punch to be applied to programme beyond that available from
conventional limiting functions.
Comprehensive metering is
provided which displays not only conventional peak sample value, but
additionally allows the user to monitor the true validity of the programme in
order to avoid the generation of damaging reconstruction overloads in the
target equipment which are often invisible during production (sometimes termed
'inter sample peaks').
A further function allows the
user to dynamically correct for reconstruction overloads in real time, thereby
achieving maximum possible modulation levels without the risks of producing
illegal signals often associated with compression and limiting.
functionality with selectable and variable depth noise shaping ensures first
class mastering output quality in either 24 bit or 16 bit modes.
64-bit compliant (AU / VST)
Enhance section to increase
Reconstruction meter shows
‘actual’ signal rather than sampled signal
Auto compensate feature corrects
recon errors without losing overall programme loudness
Attack, release and variable soft
Comprehensive dither and noise
Complete with many factory
HD-HDX: Pro Tools
AAX DSP, TDM, Native
Native: Pro Tools
AAX Native, RTAS, Audio Units and VST
The limiter plug-in comprises of four cascaded
processes in the order below.
Peak programme limiting section.
Programme enhancement section.
Reconstruction metering and compensation section.
Dithering and noise shaping section.
The Pre-process section is a musical programme
levelling function. Its primary purpose is to control programme level over a
wide range in order to provide optimum conditions for the following enhancement
stage. When the enhancement is disabled in normal mode (at 0% with Safe mode
deselected) the pre-process section can be used as a conventional levelling
section in it ’s own right.
The purpose of the enhancement process is to provide
sample value limiting and overall programme loudness improvement. The process
follows the pre-process section in the signal path and is controlled by a
separate fader from 0% (no action) to 125% (maximum action). In normal mode the
range from 0% to 100% fades in the effect to full level, at which complete
sample value limiting occurs. Settings from 100% to 125% further modify the
process to progressively increase loudness and programme density at the expense
of increasing potential distortion artefacts.
Safe mode is provided to allow absolute peak level
control without excessive enhancer action, even when using slow attack
settings. In Safe mode the enhance process is set to run permanently and the
enhance slider modifies the action of the process (rather than the proportion
of the effect). Setting ranges from 0% to 100% control the degree of programme
loudness boost generated by the enhancer. The control region from 100% to 125%
works identically to normal mode. It should be noted that in safe mode signals
at all levels are being processed permanently, therefore some minor changes to
the programme dynamics can occur even for a minimum setting of 0%.
The enhance process improves the perceived loudness
and presence of the programme by modifying the dynamic and harmonic content of
the signal. Since the method used is different from the pre-processing section,
it can further enhance the perceived volume of a previously processed signal
whilst suppressing all signal overloads. As the limiting action does not
involve conventional sample value clipping, harsh distortions are avoided and
programme detail and dynamic information is largely retained.
The addition of an attack timing control is a significant
departure from conventional limiter applications.
The attack control provides a means of increasing
the attack time to achieve a favourable improvement in the sonic qualities of
the peak reduction process by allowing peak programme transient events to
escape hard gain reduction. Since the plug-in has internal headroom these
overshoot peaks are retained and not clipped.
When the Recon Meter is selected the meter is
switched from conventional peak sample value mode into reconstruction mode. In
this mode peak reconstruction levels will be displayed on the meter. Levels in
the red overload range of the meter represent the presence of potential
and Noise Shaping
The finite mathematical precision provided by digital
audio systems and the effects of dither have been a source of confusion in the
audio community for some years. When dither is applied, any signal related
error caused by finite word length limitation is turned into constant random
noise with no relation to the signal itself, so such dithering provides
complete removal of harmonic distortion due to precision limits. With the
Oxford Limiter, we provide conventional 16 and 24 bit TPDF dither options.
In addition, the Oxford Limiter also provides
several types of Noise Shaping dither. Noise shaped dithering is a mechanism
that aims to reduce the perceived loudness of the noise of a dithered signal by
either forcing the spectrum of the noise out of the audible range or placing it
into frequency ranges to which we are less sensitive. In this way the noise at
very low levels may be reduced and even lost entirely if it is at the limit of
our hearing within ambient noise conditions.
Pro Tools 7, 8, 9 & 10, 11
Approved Pro Tools CPU, OS and hardware configuration :
Mac OSX 10.4 or later
- Pro-Codec and
Codec Toolbox compatible with Intel Mac only
Windows XP / Vista / Windows 7 / Windows 8
RAM 1GB minimum
iLok key with latest drivers
iLok2 required for AAX plug-ins
SuprEsser DS compatible with ProTools 10 / 11 / S3L with
approved ProTools CPU, OS and hardware configuration. Go to AVID.COM to find
Audio Units compatible application (Logic, Digital Performer
iLok2 required for 64-bit plug-ins
VST compatible application (Cubase, Nuendo, Wavelab, Sequoia
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