7800/7700 MultiFrame Manual
7812UDXD Series 3G/HD Up/Down/Cross Converter with Simultaneous Dual Format Outputs and AES I/O
Page - 176
Revision 1.1.1
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
th
and 95
th
percentiles of the loudness distribution.
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.