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How to Guide
Audio Loudness Monitoring
7
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The Loudness meter scale is configured by the user within the
Config
menu of the
Loudness Settings
.
Target Loudness is indicated by the White Diamond shape at the side of the meter.
Yellow and Blue Diamond shapes indicates the allowed high and low user defined
loudness thresholds.
Too Loud threshold is indicated by the Red Diamond shape.
Too Quiet threshold is indicated by the Grey Diamond shape.
2. Short Duration –
Applies the variable time duration to the integration window of the
loudness measurement. The Average Integration Time defines the duration of the
integration window and is configured within the Loudness Settings menu. The value can
range from 1 to 60 seconds.
3. Infinite Duration - Integrates the loudness measurement continuously over the audio
session duration. The audio session can be started, stopped or reset by the user. If
gating is applied then some measurement results may be excluded from the loudness
measurements.
4. Dialnorm – An AC-3 metadata parameter, numerically equal to the absolute value of the
Dialog Level, carried in the AC-3 bit stream. Valid values are 1 – 31. The value of 0 is
reserved. The values of 1 to 31 are interpreted as –1 to –31. This display shows the
current metadata value decode from the Dolby stream or from the SMPTE 2020
ancillary data packet.
5. True Peak – Shows the current maximum True peak value and indicates the channel
that has recorded the maximum true peak level. The audio level is four times
oversampled per ITU-R BS 1771
for each audio channel and shows actual signal peaks
regardless of their duration. An in-bar peak indicator will persist at the peak level for the
"Peak Hold Time". For the ATSC standard a maximum True Peak value of -2dBFS is
allowed and the EBU recommends a value of -1dBFS.
6. Audio Session Duration – The duration of the audio session is show in time and
indicates how long the audio session has been running since the last reset. The session
can be started and stop using the
Up
or
Down
arrows and can be reset by using the
SEL
button within the audio tile.