Grass Valley AMX-3981 2014 - Manual (Page 41)

GUIDE TO INSTALLATION AND OPERATION
AMX-3981 | 35
Click the Bypass Settings checkbox to bypass all the dynamics processing settings set up in this panel for this
channel.
Dynamic Gain
Sets the audio dynamic gain from 0 to 24 dB (in 1 dB steps) applied to
the selected channel. The dynamic gain is applied at the end of the
dynamics processing chain.
Limiter Threshold
A limiter is a type of compressor designed for a specific purpose, to limit
the level of a signal to a certain threshold. Whereas a compressor will
begin smoothly reducing the gain above the threshold, a limiter will
almost completely prevent any additional gain above the threshold. A
limiter is like a compressor set to a very high compression ratio (typically
1/
∞).
For example, if the limiter threshold is set to -20 dBFS and the input
signal level is -10 dBFS (10 dB above the threshold), the signal level at
the output of the limiter will be -20 dBFS.
• Use the Limiter Threshold slider to set the threshold from -20 dBFS to 0 dBFS (1 dB steps).
Compressor
Audio compression is a method of reducing the dynamic range of a signal. All signal levels above the specified
threshold are reduced by the specified ratio. When the signal level exceeds the threshold, the compressor will begin
smoothly to reduce the gain, following the attack time, until the output level reflects the specified compression ratio.
When the signal level is below the threshold, the compressor will begin smoothly to increase the gain, following the
release time, until the output level matches the input level.
For example, if the compressor threshold is set to -20 dBFS and a ratio
of 1/2, and the input signal level is -10 dBFS (10 dB above the threshold),
the signal level at the output of the compressor will be smoothly reduced
to -15 dBFS (following the attack time). Then, if the input signal level
suddenly drops to -30 dBFS (10 dB below the threshold), the signal level
at the output of the compressor will smoothly go back to -30 dBFS
(following the release time).
Use the Attack Time pulldown to set the attack time. The attack time
specifies how fast the compressor will reduce the gain:
• Possible values: 1 ms, 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 160 ms.
Use the Release Time pulldown to set the release time. The release time specifies how fast the compressor will
increase the gain:
• Possible values: 48 dB/s, 36 dB/s, 24 dB/s, 18 dB/s, 12 dB/s, 9 dB/s, 6 dB/s
Dynamic Gain
0 dB 24 dB
Limiter Threshold
-10 dBFS -20 dBFS
Compression Ratio & Threshold
1/1.5 & -20 dBFS 1/8 & -60 dBFS