11—Input and Track Channel Tools
154 www.RolandUS.com Roland VS-2400CD Owner’s Manual
2. DYN Type
Select the desired type of dynamics processor by setting the DYN Type switch. Choose:
• COMPRESSOR • EXPANDER
3. Ratio
The ratio setting determines the strength of the dynamics processing to be
applied to signals as they cross the threshold level (Page 154).
You can set Ratio anywhere from 1.00:1 to
∞
:1. The Ratio setting tells you how much a
signal’s level is to be changed by describing how much gain control the processor
would apply to keep a signal 1 dB from the threshold. With a 4.00:1 compressor ratio,
for example, every time a signal exceeds the threshold by 4 db, the compressor reduces
the signal level so that it’s only 1 dB above the threshold. An 8.00:1 compressor ratio
therefore suggests—and requires—twice as much gain reduction to keep the signal
down to the same 1 dB.
The logic of the Ratio setting can be simply stated as: The higher the number to the left
of the colon, the more the dynamics processor reduces the level of the channel’s signal
as it moves beyond the threshold level setting.
As you look for the right compression ratio, start out with a lower value and gradually
increase the Ratio setting until you like what you hear. If the sound of the processor
turning on and off is too obvious—this is called “pumping”—lower the Ratio setting.
4. Threshold
The Threshold value sets the signal level at which the dynamics processor
starts applying gain reduction to the signal. It can be set from -24 dB to 0 dB.
The Threshold value in essence sets how much of the signal will be processed:
•
When you’re using a compressor
—setting Threshold to lower values means that more
of the signal will be above the threshold and qualify for gain reduction.
•
When you’re using an expander
—setting Threshold to higher values means that more
of the signal will be below the threshold and qualify for gain reduction.
For a: The Ratio parameter sets how much gain reduction will be applied when:
compressor the signal’s level exceeds the threshold level setting.
expander the signal’s level falls below the threshold level setting.
When a compressor’s ratio is set to a 10:1 value or higher, the compressor acts as a
“limiter” because it effectively blocks signals from becoming too loud.
For a: The Threshold parameter determines the signal level:
compressor above which the compressor begins to apply gain reduction.
expander below which the compressor begins to apply gain reduction.
VS2400OMUS.book 154 ページ ２００６年２月２８日 火曜日 午前１１時１２分
To Next Page
Loading...
