LCn English Manual

Interface and feature reference
LCn Manual 16
Source and target LRA descriptors
The Loudness Range (abbreviated as “LRA”) de-
scriptors show the loudness range of the unpro-
cessed and the processed clip or file as stan-
dardized in EBU R128. The unit is LU.
The Loudness Range descriptor quantifies the
variation of the loudness measurement of a pro-
gram. It is based on the statistical distribution
of loudness within a program, thereby excluding
the extremes. Thus, for example, a single gun-
shot is not able to bias the LRA number.
EBU R128 does not specify a maximum permit-
ted LRA. R128 does, however, strongly encour-
age the use of LRA to determine if dynamic treat-
ment of an audio signal is needed and to match
the signal with the requirements of a particular
transmission channel or platform.
Source and target Short
Term Max descriptors
The Short Term Max (abbreviated as “SMax”)
descriptors show the maximum momentary val-
ue for the unprocessed and the processed clip
or file.
Source and target True
Peak Max. descriptors
The True Peak Max (abbreviated as “TPMax”)
descriptors show the maximum true-peak value
for the unprocessed and the processed clip or
file.