Dialog Normalization; Average Hold; Adaptive Input Detection - Linear Acoustic ARC Installation & User Manual

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Basic Processing and Loudness Control

Chapter 8 |

Dialog Normalization

The Dialog Normalization control (L) enables dialog detection and measurement. When enabled, APTO's Compliance

processing stage uses long-term speech-only measurements rather than the overall input program loudness to ensure the

output target level is achieved.

The use of dialog-based measurement is normally determined by regional regulations. For example, ATSC A/85 relies upon

anchor-based normalization, specifically dialog, while EBU R128 recommends the use of overall measurements. This is

reflected in their respective factory profiles.

When the Average Hold control (K) is enabled and the output audio of the Dynamic Range processing stage falls below the

level set in the Average Hold Threshold control (located in the Advanced menu), APTO's Compliance stage of processing

becomes inactive until the level once again rises above the threshold. This helps prevent noise and low-level background audio

from being increased unnecessarily.

When enabled, the Adaptive Input Detection control (I) dynamically adapts the amount of processing occurring in the

Dynamic Range stage of processing depending upon the actual measured average level at the input. The degree to which the

actual input levels influence the processing versus relying upon the value of the Average Input Level control (found in the

Advanced menu) is determined by the Adaptive Input Percentage control (also located in the Advanced menu).

When Adaptive Input Detection is disabled, Dynamic Range processing decisions are made based strictly upon the value set in

the Average Input Level and in accordance with the settings of other parameters and controls.

Adaptive Input Detection is especially useful when source audio levels are unknown or are likely to vary widely as it allows the

Dynamic Range processing stage to respond more predictively the actual incoming content.

If the incoming content has already been analyzed and loudness-corrected in the file domain, less overall processing is required

and a more natural-sounding output can be achieved by setting the Average Input Level (located in the Advanced menu) to the

same value as the target level used during file-based correction and reducing the value of the Adaptive Input Percentage control

(also found in the Advanced menu) or disabling Adaptive Input Detection altogether.

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