TC Electronic Radar Meter Bundle TDM - Manual (Page 6)

ENGLISH
4 / LM5/LM5D & AM6
ENGLISH
When production engineers realize the boundaries they should generally stay within,
less dynamics processing is automatically needed during distribution, and the
requirement for maintaining time-consuming metadata at a broadcast station is
minimized. In broadcast, the goal is to use the same loudness measure for
- Production,
- Ingest,
- Linking
- Master Control Processing
- Logging
thereby ensuring better audio quality not only in DTV audio, but across all broadcast
platforms. LM5D and TC processing can co-exist with PPM meters, VU meters or
Dolby’s LM100 meter. LM5D greatly increases the usability of LM100 in production
environments because it provides running status, and gives a standardized indication
of both dialog and non-dialog program.
Fig 2, Color coding and target
loudness for selected broadcast
platforms based on a consumer’s
Dynamic Range Tolerance, DRT.
The aim is to center dynamic range
restriction around average loudness,
in this case the –20 dB line, thereby
automatically avoiding to wash out
differences between foreground and
background elements of a mix.
Note how different the broadcast
requirements are from those of
Cinema.
ever decreasing dynamic range. By now, the pop music industry is “right of” In Flight
Entertainment in the illustration.
LM5D offers a standardized option: The visualization of loudness history and DRT
in combination with long-term descriptors from production onwards, is a transparent
and well sounding alternative to our current peak level obsession. Not only for music,
but also in production for broadcast or film. The engineer, who may not be an audio
expert, should be able to identify and consciously work with loudness developments
within the limits of a target distribution platform, and with predictable results when
the program is transcoded to another platform.
LM5D therefore color codes loudness so it’s easy to identify target level (green), below
the noisefloor level (blue), or loud events (yellow), see Fig 2.