7800/7700 MultiFrame Manual
7814 Series Dual HDTV Up/Down/Cross Converters
Revision 1.1.3 Page - 125
7.26.6.4. Integrated Loudness Meter
7.26.6.4.1. Integrated Loudness
The Integrated Loudness control will provide a real time value of the calculated integrated loudness value.
This control is used for monitoring purposes only.
The period of the integrated loudness measurement is defined by the Start/Continue and Stop/Pause
buttons. Once the Stop/Pause button is activated, the loudness of the segment(s) defined by all active
periods is calculated.
The integrated loudness measurement is performed using the gating function specified in ITU-R BS.1770-
2 summarized as follows:
- an absolute gating threshold at -70 LKFS is used to compute the absolute-gated loudness level
- a relative gating threshold that is 10 LU below the absolute-gated loudness level is applied
the measurement input to which the gating threshold is applied is the loudness of 400 ms blocks with a
constant overlap between consecutive gating blocks of 75%
7.26.6.4.2. Maximum Loudness
The Maximum Loudness control will provide a real time value of the calculated maximum loudness value
within the duration of the Integrated Loudness calculation. This control is used for monitoring purposes
only.
7.26.6.4.3. Loudness Range
The Loudness Range control will provide a real time value of the calculated loudness range value within
the duration of the Integrated Loudness calculation. This control is used for monitoring purposes only.
The Loudness Range describes the distribution of loudness within a program and is defined as the
difference between the highest and lowest loudness values within the Integrated Loudness period. This
range excludes all loudness values in the top 5% and bottom 10% of the loudness distribution after
applying a relative gating threshold of 20 LU below the absolute-gated loudness level.
7.26.6.4.4. Loudness Range Low
The Loudness Range Low control will provide a real time value of the lowest calculated loudness value
within the duration of the Integrated Loudness calculation, given the exclusions and thresholds used as
described in the calculation of the Loudness Range. This control is used for monitoring purposes only.
7.26.6.4.5. Loudness Range High
The Loudness Range High control will provide a real time value of the highest calculated loudness value
within the duration of the Integrated Loudness calculation, given the exclusions and thresholds used as
described in the calculation of the Loudness Range. This control is used for monitoring purposes only.
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