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5 | Instruments | 5.2 | Loudness Sum EN-48
Manual | TM3-3GS
The bargraphs available in the Loudness Sum instrument show the following:
•
M (Momentary): Summed momentary loudness measurements of the
individual channels using an integration time of 400 ms.
• S (Short Term): Summed loudness measurement using an integration
time of 3 s and a sliding window.
• I (Integrated): Overall program loudness between start and end
points that are entered manually. Use the Start, Stop
and Reset buttons to execute this measurement.
The three bar graphs representing these loudness measurements can be
activated or disabled individually.
Two different scale types are available for loudness measurements:
• Absolute scale in
LKFS or LUFS (depending on the loudness standard
selected).
• Relative scale in LU .
On the relative scale, 0 LU corresponds to their target level defi ned in the
selected loudness standard. In EBU R128, the target level is –23 LUFS.
In ATSC A/85, the target level is –24 LKFS. –23 LUFS is identical to –23
LKFS.
In order to conform to the individual loudness standard used, the mea-
sured program should read the „Integrated“ target level of this standard.
Using EBU R128, it should read 0 LU on a relative scale or –23 LUFS on
an absolute scale.
Factory presets using the Loudness Sum instrument:
• 2CH SDI ATSC LRA+CORR
• 2CH SDI EBU LRA+CORR
• 3 X 2CH SDI ATSC
• 3 X 2CH SDI EBU
• 5.1 SDI ATSC LRA
• 5.1 SDI ATSC LRA+TC
• 5.1 SDI EBU LRA
• 5.1 SDI ATSC MON
• 5.1 SDI EBU MON
• 5.1+2CH SDI ATSC MON
• 5.1+2CH SDI EBU MON