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APTO™ Processing
Many factors can influence whether or not content at the output is compliant. These include the level consistency
of the incoming audio, program duration, the difference between the average input level and the Target level, the
amount of Adaptation employed, and the settings of many of the controls listed in this chapter.
That said, a smaller compliance window value more easily delivers a compliant output for shorter program
durations, but can produce more variations in long-term programming.
On the other hand, a larger compliance window value will allow for a smoother and more consistent average
overall for longer program durations, but can reduce the effectiveness of short-term normalization, especially
program elements shorter in duration than the compliance window.
For short-term programs, a value in the range of 20-30 seconds is recommended. Larger values, from 60-120
seconds, are recommended for mid- to long-form content. For profiles which rely upon Dialog Normalization, a
setting between 120-180 seconds is highly recommended.
Average Input Level
The value of the Average Input Level control (10-2L) should be set to match the average level of the input audio
as it serves as the mid-point value of the comfort zone defined by the Null Area Coefficient control.
For content that has been previously analyzed and loudness corrected in the file domain, this value will be easy to
determine.
For live programming, unprocessed material, or in cases where programming is of different genres from different
decades, this becomes more challenging. For example, cinematic content is typically mixed to -31/-27 LUFS,
while music productions can be as loud on average as -12/-8 LUFS.
In these cases where the average input level is not easy to predict, it is best to enter a value that matches the output
target loudness value, enable Adaptive Input Detection, and take advantage of APTO's intelligent dynamics
processing.
Chapter 10 | 63
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