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Chapter 8 |
44
Basic Processing and Loudness Control
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.
Average Hold
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.
Adaptive Input Detection
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.