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7800/7700 MultiFrame Manual
7812UDXD Series 3G/HD Up/Down/Cross Converter with Simultaneous Dual Format Outputs and AES I/O
6.50.7.4. Program x Integrated Loudness Meter
6.50.7.4.1.
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 defined in sections 6.50.7.4.7 and 6.50.7.4.8. 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%
6.50.7.4.2.
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.
6.50.7.4.3.
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 estimates of the 10
6.50.7.4.4.
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. This control is used for monitoring purposes
only.
6.50.7.4.5.
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. This control is used for monitoring purposes
only.
6.50.7.4.6.
Reset
The Reset control will flush the buffer for the Integrated Loudness calculation.
This control should be activated each time a new Integrated Loudness value is to be obtained.
Page - 176
th
th
and 95
percentiles of the loudness distribution.
Revision 1.1.1
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