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How to Guide
Audio Loudness Monitoring
25
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Function
Description
Set 0LU Mark to
The Loudness meter can have the 0LU configured to either the
Full
Scale
top of the Loudness meter or the 0LU mark can be set to the
Target Loud
value that is based on the user defined Target Loudness
value.
Gating Type
Loudness Gating
refers to the practice of excluding moments of low
level audio from the loudness measurement, in order to improve the
accuracy of the measurement.
The Gating Type can be configured as follows:
Disabled
No Gating measurements are applied to the Loudness
measurement.
Safety Only
When the current loudness level goes below the Safety
Gate Level these loudness measurements are not included in the
loudness measurement.
Relative
. When the difference between the current loudness level
and the overall loudness exceed the relative gating threshold then
these loudness measurement values will not be included in the
loudness measurement.
Safety Gate Level
The loudness level set for Safety Gating
measurements below which the loudness values will not be included
within the loudness measurement.
The default limits is -99LKFS and is user selectable. This value is
used when Gating type is set to Safety Only.
Relative Gate Level
The loudness level set for Relative Gating
measurements. When the difference between the current
measurement and the overall measurement exceed the relative
threshold. Then these loudness measurement values will not be
included in the overall loudness measurement.
The default limits is -10LU (-10LKFS) below the loudness level and is
user selectable. This value is used when Gating type is set to
Relative mode.
Program Detect Enable/Disable
If enabled ignores leading silence
values at the start of a loudness measurement.
Loud A-D Conversion
Some loudness measurements, such as the LKFS measurement defined
in ITU-R BS.1770, are defined in terms of digital fullscale rather than on
analog signal levels.
The Loudness A-D Conversion parameter allows you to specify what
digital signal level an analog voltage of 0 dBu shall be converted to for
the purpose of making digitally-defined measurements. In general, it is
recommended that this parameter have the same value as the Digital
Audio Test Level.
Common values for this parameter are:
In North America,
-20 dBFS
In Europe,
-18 dBFS
This parameter only affects digital loudness measurements such as
LKFS. It does not affect audio bar readouts
.