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LRA
Long integrated
measurements:
Short integrated
measurements:
Pre Dialnorm
True peak:
AG-7.2.B1-092414 • Restricted - customer use only
Loudness Range Measurement (LRA) quantifies the variation in a
time-varying loudness measurement. Loudness Range is
supplementary to the main audio measure, Program Loudness,
of EBU R 128. Loudness Range measures the variation of
loudness on a macroscopic time-scale, in units of LU (Loudness
Units). The computation of Loudness Range is based on a
measurement of loudness level as specified in ITU-R BS.1770,
albeit with a different gating threshold. Loudness Range should
not be confused with other measures of dynamic range.
Long Form Integrated measurements greater than two minutes.
There are a total of 7 user defined, configurable measurements -
e.g. 1 hour, 6 hour, 1 day, 5 day intervals. By default MIPsets the
long term values as follows: 60, 360, 1440, 0 , 0 , 0, 0.
Short Form integrated are measurements which are two minutes
or shorter. There are a total of 7 user defined, configurable
measurements - e.g. 10s, 30s, 60s. By default MIP sets the short
term values as follows: 10, 15, 20, 30, 60, 120, 0.
DialNorm indicates the level of average spoken dialogue within
the encoded audio program.
Typical values for short and long term are factory preset.
DialNorm should be enabled whenever an Encoder is ingesting a
digital audio stream such as optical, s/pdif, or Dolby AC-3.
Enables monitoring the value of the audio signal waveform of a
program in the continuous time domain; detects peak loudness
that otherwise would escape the sampling process.
Table: Loudness Monitoring
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