Parameter Values Description
Measure + ALC + LTLC
Measurements are taken and corrections are made for
short term peak in audio that are measured 1 LU above
the Target level. Corrections are also made over the
longer term to adjust the channel loudness level to that of
the Target Level.
In this mode manual gain adjustment from the codec page
is disabled.
Target Level -40 to 0 (LKFS (LU) The desired Loudness level for the channel
Time Period 5 to 120 minutes
This controls the responsiveness of the long term audio
loudness level correction.
A smaller number will result in the audio being adjusted
more dynamically. A larger value will give a slower less
noticeable adjustment.
Peak Limit -20 to 0 dBFS
This controls a hard clipping limiter for the audio level. This
adjustment is based on the absolute peak level measured
in dBFS.
The peak limiter only operates in ‘Measure + ALC’ and
‘Measure + ALC + LTLC’ modes.
If this value is set to 0 no limiting is performed
Maximum Boost 0 to 10 dB
This control determines the maximum amount of gain that
the LTLC algorithm can apply. This is to prevent over
adjustment which can lead to unwanted audio artifacts.
This only applies when the operating mode is “Measure +
ALC + LTLC”
Maximum Attenuation 0 to 10 dB
This control determines the maximum amount of
attenuation that the ALC and the LTLC algorithm can
apply. This is to prevent over adjustment which can lead to
unwanted audio artifacts
Preset Subtle, Standard, Strong
The available options are Subtle, Standard and Strong.
This setting controls the aggressiveness of the corrections
performed by the Short Term ALC algorithm. It controls
how quickly the correction takes place and the strength of
the correction
Reset Statistics True, false
This can be used to reset the statistics that have been
collected in the Audio Algorithm. Due to the slower update
nature of the web interface the apparent change would be
to the measurement of the Integrated Loudness only
The reference target
level
Line out mode; RF mode; Portable mode -14dB;
Portable mode -1dB; Portable mode -8dB
Sets the reference target level for downstream decoders.
Override dialnorm
metadata
Off, on
For Dolby encoding, the dialnorm parameter can be
overridden with the Target Level. This is recommended
practice.
Audio Component
The parameters listed in the table below are available on the Component tab of the
Properties widget on the Service Configuration page when an audio component is
selected in the Outputs widget. The same parameters can be accessed through the
Output/<output name>/Transport Stream ID: <n>/Service List/<service
name>/Component List/<component name> menu on the front panel.
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