Harmonic ELECTRA VS - Page 277

Chapter 3 ’Web User Graphical Interface’ — Workflow Library
Electra VS - Version 05.10 277
User Manual - Rev. A
 If set to Automatic loudness control :
- ALC mode : 3 modes are available: EBU R128 ,
A-Weighting or Flat .
- Compression ratio : from 1 to 100 , with predefined
values
soft(2) , medium(10) and hard(40) . The higher the
ratio is, the lower the output audio dynamic will be.
- Loudness target : the target level. The unit depends on
the ALC mode. In decibels in the case of FLAT or
A-weighting ALC mode, or loudness units relative to full
scale (LUFS) in the case of EBU R128 ALC mode.
- Noise level : when the input is lower than the Noise level,
then the signal is not modified. level of noise below which
the audio level is ignored by the loudness analysis, in
decibels or loudness units relative to full scale (LUFS).
Signal below this level is modified equally (without audio
dynamic modification) according to the compression ratio
and the loudness target.
 If set to Static loudness control : a static gain is configured
separately for all the channels. For mono input, the
Left gain is
applied.
 If set to Peak limiter : the level is limited to Loudness target . It
corresponds to the
Automatic Loudness Control in Flat
mode with a
Compression ratio set to 1.
 Audio delay : delays/advances the audio (+/- 3 seconds). 
Note: several audio delays can be added if a 3 seconds delay is not
enough. In the case of a statmux program, the audio latency shall
never exceed the video latency, so the global delay that you can apply
on the audio component will be limited.
 Audio mute : allows muting and unmuting dynamically. This can be
useful for blackout management.
The loudness level and correction are processed on the fly.
Integrated in the long-term scale the loudness level may be lower
than the entered loudness target.