crystal User Manual
Version: 6.6.0/2
91/459
7. Operation
7.11.2
Loudness Metering (for PGM 1)
VisTool (Monitoring & Metering)
On VisTool, there are two loudness measurements: momentary and integrated which conform to the ITU-R
BS1770.
Momentary Loudness (Bargraph)
The blue bargraph represents the average energy of the summed component channels: left and right. The
average is measured using either a Momentary (400ms sliding window) or Short term (3s sliding window)
integration time.
The color indicates whether loudness is above or below the Target Level:
·
Light Blue
= equal to, or below, the Target Level.
·
Dark Blue
= above the Target Level.
Scale markers indicate a tolerance of +/- 1 LU/LK.
Integrated Loudness Measurement (in LUFS)
The integrated loudness measurement is controlled by the on-screen
Start
,
Stop
and
Reset
buttons. It is very
useful for measuring loudness over a longer period - for example, for the duration of the show.
The measurement is displayed in LUFS (Loudness Units Full Scale).
