DaySequerra NLC5.1ST User Manual
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NLC5.1ST User Manual 17Loudness Control Parameter PresetsParameters 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. Thefactory defined presets have been designed as general starting points and may not be appropriate forall types of audio.Editing PresetsPresets may be modified directly on the unit by way of the edit preset menu. To enter the menu, pressthe HOME button while on the home screen. The cursor will appear over the edit preset icon. PressENTER 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 controlprocess 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 differencesare measured. For example: A setting of 1.00 indicates that for every dB of loudness differencemeasured between the input signal and the target level, 1 dB of gain or attenuation will be applied. Asetting of 0.50 indicates that for every dB of loudness difference measured between the input signaland 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 canrange before attenuation is applied. If an input signal falls between the Upper Thresh and the LowerThresh in reference to the Target Level, no correction will be applied. For example: A setting of +4dBindicates 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 dBindicates that attenuation will be applied to any input signal exceeding the Target Level. LowerThreshold: Represents the allowable distance below the Target Level the input signal can range beforegain is applied. If an input signal falls between the Upper Thresh and the Lower Thresh in reference tothe Target Level, no correction will be applied. For example: A setting of -5 dB indicates that audiocontent can range 5 dB below the target level before gain is applied. Content arriving quieter than 4 dBbelow the Target will be appropriately raised. A setting of 0 indicates that gain will be applied to anyinput signal falling below the Target Level.Dead Band: Sets the size of a “band” in dB where small loudness differences that fall within this rangeare deemed allowable. When loudness differences fall outside of this allowable band then appropriategain or attenuation is applied to control loudness. The Dead Band parameter can be effectively used tolimit the amount of small range gain variability. For example: A window setting of 4 dB indicates thatwhen the loudness level is measuring within ±2 dB of the target level that no further correction isrequired. When the loudness level becomes further than ±2 dB from the target level then appropriategain or attenuation is applied.Noise Floor: Controls the noise floor level. Input signals below the threshold are considered too low |
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