page 3 - 18
Aura8ip / Jan 2012
A u r a 8 i p P r o G U I
Delayed Release Control
This control sets the amount of delayed or secondary release for the
limiter. When Delayed Release is engaged (see below) the first 3dB of
gain reduction is released at the Release Time setting and the remainder
occurs at the speed set by the Delayed Release control. The purpose of
delayed release is to reduce or prevent intermodulation distortion when
very fast limiter release times are being used. Delayed Release also helps
to reduce pumping artifacts by preventing the limiter from making a full
gain recovery during syllabic changes in audio level.
Look Ahead Limiter Special Option Checkboxes
Final Limiter
– When this box is checked the final limiter is engaged
and its operation is governed by the final limiter operating adjustments.
When this box is not checked the final limiter is disabled and no final
peak control is in effect.
Delayed Release
– When this box is checked the final limiter is utiliz
-
ing the Delayed Release algorithm as governed by the Delayed Release
control setting as explained earlier. When this box is not checked, only
the primary Release time algorithm is in effect.
Look Ahead
– When this box is checked a small amount of lookahead is
applied to the final limiter, allowing it to react to an upcoming audio peak just
as it arrives at the limiter input. Lookahead allows the limiter to anticipate
peaks and adapt to them early enough that output level overshoots due to
non-zero attack time are prevented. We recommend using the Lookahead
option whenever signal path latency is NOT an issue. If latency is an issue,
this option should not be checked (lookahead is then bypassed).
Output Control (Output Level dBFS)
The output level control sets the absolute peak output level within the range
of -39.5dBFS to 0dBFS. If the control is set below -39.5dBFS the audio
is muted (OFF). Remember that there is no more processing available af
-
ter this stage so some care is required in setting the Output Level if peak
headroom is a concern in your application.
