Ross LDP-8242, User Manual, Page: 72 / 100

3–38 • Operating Instructions LDP-8242 User Manual (Iss. 03)
Audio Loudness Dual Metering
Channel Mapping sub-tab provides channel selection for 5.1 and/or
stereo channels to be loudness processed. Also provides controls for
selecting loudness processing profile preset.
Note :5.1-channel loudness processor is described below. Stereo loudness processor has identical controls with omission of
controls other than L and R.
Loudness Meter 1 / Meter 2 Source
Channel Selection
Separate drop-down lists for each loudness processor input channel that
directs any combination of card audio processing channels (listed below)
to each of the loudness processor inputs as shown below.
Note : Set any unused channel inputs to Silence.
Processing Profile Preset Selection Enables or bypasses loudness processing, and allows selection of preset
loudness profile best suited for the program material and/or model of
processing desired as follows:
• TV 5B General – This is the general, recommended preset for all
types of content. It provides moderate dynamic range compression
and is calibrated to produce audio having an average dialog
loudness of -27LKFS with no additional output level trim. Use of this
preset as an initial setting is recommended.
• TV 5B Light – Similar to TV 5B General, this preset varies in that
multi-band compression is reduced closer to 2:1, thereby providing
a more gentle action.
Note : This preset sacrifices agility in loudness control in favor of a
more gentle compression profile; this preset may not be suitable for
some material.
• TV 5B Heavy – Similar to TV 5B General, this preset varies in that
multi-band compression is increased for greater level
density/adherence to target at the expense of dynamic range.
• TV 5B Loud – Similar to TV 5B Heavy, but with a louder, more
punchy perception.
• ITU Loud Limit – Utilizes a specially tuned input AGC plus
multi-band and a final limiter to gradually adjust the average
program loudness to an internally set AGC value, with the
multi-band and final limiters acting until the AGC gains control of the
level. This preset is most appropriate for ingest or live program
material.
Note : This preset bypasses the multi-band AGC. As such, it has
less ability to manage spectral balance.
• Protection Limit – Bypasses all processing except for final output
limiter, which is set only to prevent overload.
Note : Unless the audio received has already been loudness
processed, this setting is typically not recommended.
• Custom – See next page.
Master Output Gain Control Allows fine adjustment of the overall output gain.(-20.0 dB to 11 dB range
in 0.1 dB steps; default = 0.0 dB)
Note : This control is primarily useful in matching the output level to an
alternate LKFS target level if required. Also, it is useful (where desired) in
matching various Processing Profile presets to have similar output levels.
Note : For convenience, Measurement 1 and Measurement 2 audio loudness metering displays are duplicated on this
sub-tab. Refer to Card Loudness Metering (p. 3-47) for full descriptions of these displays and their controls.
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