Linear Acoustic AERO.qc, Руководство пользователя

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Linear Acoustic AERO.qc User Guide Presets & Processing Adjustment
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Input AGC
The input AGC is a very slow acting front-end gain control with a 36dB gain range whose
only purpose is to make sure that the following processing stages are fed with the correct
average audio levels. It is basically the automatic equivalent of an operator slowly riding a
gain control on a console to keep the audio close to reference level. Wideband in nature,
the AGC is not meant to perform rapid gain reduction or expansion as its actions will be
more audible, as with all wideband gain processors. As a slow gain rider, its actions are
nearly inaudible thanks to the multiband processing that follows it. The AGC has two stag-
es of gating where the gain expansion is slowed or stopped to prevent background noise
increasing.
Adjustable parameters are:
• Gating Thresh(old): 0dBFS to -90 dBFS
-Gating sets the point at which the AGC release time is made extremely slow
to prevent increasing background noise and allow the AGC to return to unity
gain.
• Freeze Thresh(old): 0dBFS to -90dBFS
-Freeze stops all gain change (i.e. when the audio drops to silence), and remains
frozen at its current gain value until the threshold is exceeded.
NOTE: Gate and Freeze MUST be adjusted to match plant practices. Very quiet audio
(such as a golf match) benefits from having processing frozen when input au-
dio drops below a given level to prevent “boosting the cricket” sounds.
• Ratio: 1:1 to Inf:1
• Range: 0dB - 36 dB
-Range sets how much gain expansion above unity is performed, and this
amount is subtracted from the total AGC gain range of 36dB, so the default
value allows for 24dB of expansion and 12dB of compression. This adjustment
is reflected in real time by changing the AGC meter scale.
• Threshold: -18dBFS - 0dBFS
• Attack: 0 - 150, slowest - fastest
• Release: 0 - 150, slowest - fastest
• Progressive Release: 0 - 100, slowest - fastest