LUveler is a loudness and dynamics modification plugin compatible with the ITU-R BS.1770 specification. It provides a precise reduction of the dynamics and works as transparently as possible to maintain the sound quality even under heavy use of its compressors and limiters. This allows a wide range of applications, such as matching dynamic material produced according to the EBU R 128 to a much louder platform. Or the automatic leveling of a podcast. Or simply increasing or decreasing loudness without changing the dynamic range. High-quality true peak limiters avoid exceeding the maximum level.
The LUveler plugin was
developed for the use in an automated environment using the LADSPA API.
A VST version for Windows has been added. Porting it to other platforms
and operating systems, such as MacOS, is not planned!
It is also not planned to add meters to the graphical user interface. But there are very good freely available loudness meters, like the Youlean Loudness Meter.
Downloads:
VST2 Plugin v1.12 for Windows PC 32/64bit
LADSPA Plugin v1.12 for Windows PC 32/64bit
LADSPA Plugin v1.12 for Linux x86 32/64bit
Please note the disclaimer on the right!
The VST2 plugins have a simple graphical user interface. By holding down the shift key, the sliders can be moved more slowly. This allows for precise adjustment of the values. There are separate VST2 plugins for stereo and 5.1 because the channel detection on VST2 plugins with variable channel count does not work on all DAWs. The VST2 5.1 plugins can be recognized by the name extension _51.
The LADSPA plugins include 3 variants: luvr_mono, luvr_stereo and luvr_5dot1. The luvr_mono complies with the ITU-R BS.1770 pan law for mono, the luvr_stereo with stereo, the luvr_5dot1 with 5.1. The latency is 1698 samples at 48 kHz and 1560 samples at 44.1 kHz. It is forwarded automatically to the host. LADSPA doesn´t support a custom GUI.
Release notes v1.12:
- Slightly improved true peak limiter.
Features:
- Supported Samplerates: 8 kHz - 192 kHz
- Latency: 35.375 ms
Short explanation of the parameters:
Target Level:
This is the desired target loudness, e.g. -16.0 LUFS. In case the
source material has very quiet passages or is very dynamic, e.g. movies
or classical music, the adjusted value will not be reached and must
therefore be set higher.
True Peak: The maximum true peak
level. Please note that the calculation of the inter sample peaks
depends on the used upsampling algorithm and leads to slightly different
results between limiters and true peak meters. The upsampling algorithm
in the LUverler limiter is designed to process the transients as
cleanly as possible and to exceed the true peak level as little as
possible even with very high quality true peak meters. Depending on the
material and the true peak meter used, the adjusted value can be
overshot by up to 0.2 dB.
Max Gain: The maximum overall
gain. The overall gain also includes the basic loudness boost. So, for
example, if you want to boost the quiet parts by up to 10 dB, and you
have a Target Level of -16.0 LUFS and a measured integrated loudness of
the source material of -23.0 LUFS, then the Max Gain must be set to 17
dB. 7 dB is needed to boost from -23.0 to -16.0 LUFS.
Freeze Level:
The gain is only increased if the loudness of the input signal exceeds
this threshold. The loudness of the input signal and not the individual
sample is taken as the reference value, so that individual short peaks,
e.g. a cough in an otherwise quiet concert hall, do not immediately
raise the entire background.
Correction and Input Level:
In addition to the controlled loudness adjustment, a fixed gain can be
set via the Input Level. The known or previously measured integrated
loudness of the source material can be taken as the Input Level. The
Correction sliders (High / Low) set the amount of controlled gain
compared to the fixed gain. 0% -> completely fixed gain, 100% ->
completely controlled gain. This way the dynamic range can be
selectively reduced without making everything sound flat. The
differences between loud and quiet parts become smaller, but remain
proportional. The Max Gain is always enabled, but never exceeded.
The
correction is divided into two parts - High and Low. The loudness of
the control loop is constantly compared with the set Input Level. If the
loudness of the control loop is above this level, "Correction High"
applies, otherwise "Correction Low" applies. This allows, for example,
parts that are louder than the target level to be reduced dynamically to
a greater extent than the quieter parts. As a result, a higher dynamic
range is maintained and the limiter is still relieved.
Corr Mix Mode: Sets the characteristic curve of the mixing ratio for Correction High and Low.
0: linear characteristic for Correction High and Low
1: linear characteristic for Correction High and logarithmic characteristic for Correction Low
2: logarithmic characteristic for Correction High and linear characteristic for Correction Low
3: logarithmic characteristic for Correction High and Low
With
logarithmic Mix Mode or if very different values are used for
Correction High and Low, the program loudness may fall below the target
value. This can be compensated by increasing the Target Level.
LFE Gain (5.1 only):
This allows the level of the LFE channel to be adjusted. In BS.1770,
the LFE channel is not taken into account. Therefore no dynamic
processing is provided. In order not to exceed the adjusted true peak,
the LFE channel is also limited by a true peak limiter.
