NLC5.1ST User Manual
17
Loudness Control Parameter Presets
Parameters that define how loudness control is applied to the input audio can be set by way of presets.
NLC5.1ST contains three factory defined presets as well as space to save 4 user-defined presets. The
factory defined presets have been designed as general starting points and may not be appropriate for
all types of audio.
Editing Presets
Presets may be modified directly on the unit by way of the edit preset menu. To enter the menu, press
the HOME button while on the home screen. The cursor will appear over the edit preset icon. Press
ENTER key to enter the menu. Scroll to the desired preset to be edited and press ENTER.
The following parameters are present in each preset:
NLC Measure
: Determines which loudness measurement scale is used by the loudness control
process to measure the audio loudness.
5.1 Target Level
: The desired target level for the 5.1 signal flow.
ST Target Level
: The desired target level for the auxiliary stereo signal flow.
Correction Ratio
: Controls the amount of gain or attenuation that is applied when loudness differences
are measured. For example: A setting of 1.00 indicates that for every dB of loudness difference
measured between the input signal and the target level, 1 dB of gain or attenuation will be applied. A
setting of 0.50 indicates that for every dB of loudness difference measured between the input signal
and the target level, 0.5 dB of gain or attenuation will be applied.
Upper Threshold
: Represents the allowable distance above the Target Level the input signal can
range before attenuation is applied. If an input signal falls between the Upper Thresh and the Lower
Thresh in reference to the Target Level, no correction will be applied. For example: A setting of +4dB
indicates that audio content can range 4 dB above the Target Level before attenuation is applied.
Content arriving louder than 4 dB above the Target will be appropriately attenuated. A setting of 0 dB
indicates that attenuation will be applied to any input signal exceeding the Target Level. Lower
Threshold: Represents the allowable distance below the Target Level the input signal can range before
gain is applied. If an input signal falls between the Upper Thresh and the Lower Thresh in reference to
the Target Level, no correction will be applied. For example: A setting of -5 dB indicates that audio
content can range 5 dB below the target level before gain is applied. Content arriving quieter than 4 dB
below the Target will be appropriately raised. A setting of 0 indicates that gain will be applied to any
input signal falling below the Target Level.
Dead Band
: Sets the size of a “band” in dB where small loudness differences that fall within this range
are deemed allowable. When loudness differences fall outside of this allowable band then appropriate
gain or attenuation is applied to control loudness. The Dead Band parameter can be effectively used to
limit the amount of small range gain variability. For example: A window setting of 4 dB indicates that
when the loudness level is measuring within ±2 dB of the target level that no further correction is
required. When the loudness level becomes further than ±2 dB from the target level then appropriate
gain or attenuation is applied.
Noise Floor
: Controls the noise floor level. Input signals below the threshold are considered too low
Summary of Contents for NLC5.1ST
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