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3
Audio Loudness Meter Measurement Modes
Table 3-1
Audio Loudness Meter Measurement Modes
Mode
Note: Refer to ATSC A/85, "ATSC Recommended Practice: Techniques for Establishing and Maintaining Audio Loudness
for Digital Television" or EBU – Tech 3343, "Practical guidelines for Production and Implementation in accordance
with EBU R 128", as applicable, for full details regarding audio loudness measurement and assessments using
these standards.
EBU +9
EBU +18
ATSC -24
Custom
Audio Meter Displays
3-2
Table 3-1 lists and describes the measurement modes available for the Audio
Loudness Meter option. The
factory configured with all parameters conforming to the respective standard
and are ready for immediate use (requiring only input channel assignment for
use).
• EBU R 128 "+9 Scale" or EBU R 128 "+18 Scale" standards.
• Normalized 0 LU ref. to -23 LUFS.
• Usable range is +9.0 to -18.0 LU (EBU +9) and +18.0 to -36.0 LU (EBU +18).
• Uses a fixed target value of -23 LUFS (0 LU).
• Gating is applied in which levels below the gating threshold (-8 LU below the target
level) are rejected from the session measurement. Measurement parameters include
fixed Momentary (M) sampling over 400 msec intervals, Short-Term (S) sampling over
3 sec intervals, and Integrated (I) sampling over the entire session.
• ITU-R BS.1770-1 – ATSC A/85 standard.
• Normalized 0 LU ref. to -24 LKFS
• Uses a fixed target value of -24 LKFS.
• Gating is not used; all measured values are included in short-term and session LKFS.
Provides full parametric user configurability to be set as modified EBU R 128 or
ATSC A/85 mode.
Note: Custom mode configured with user settings may not be compliant with EBU R 128
or ATSC A/85 standards.
Configurable parameters are as follows:
• Target LUFS/LKFS
• Units (LKFS/LUFS)
• Units absolute or relative ref. configured target LUFS/LKFS
• Moving average period (default= 3 sec)
• EBU relative gating (disable/enable) and gating threshold
• Viewable range
(See Figure 3-1) The Audio Loudness Meter option uses the two displays of
the Control Panel as follows:
•
Left display panel is live data display. Refer to Live Data Display
(Left Display) and Display Formats (p. 3-3) for more information.
•
Right display panel is session control display. Refer to Session
Control (Right) Display (p. 3-5) for more information.
AUDIO LOUDNESS METER OPTION (+LM-C, +LM-P) MANUAL SUPPLEMENT
Audio Loudness Meter Measurement Modes
EBU +9
,
EBU +18
Description and Parametric Settings
, and
ATSC -24
modes are
OPT-SW-LM-MS (V2.9)
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