11—Input and Track Channel Tools
Roland VS-2000 Owner’s Manual www.RolandUS.com 157
What’s an Expander?
The DYN screen expander is a downward-type expander that exaggerates the
differences between a signal’s loudest parts and its softest parts—it widens, or
“expands,” the signal’s dynamic range. You can use an expander to make unwanted
background noise quieter. An expander can also make a signal’s original dynamic
changes more exciting by making them more pronounced.
The expander works by bringing down the level of any signal that falls below the
threshold level setting, making the signal even quieter. The ratio setting determines
how much gain reduction will be applied. The speed at which expansion begins is set
by the attack time, and the release time sets how long expansion lasts before the
signal’s allowed to rise back up to its un-processed level.
1. Dynamics Sw
The Dynamics switch—also visible on the CH EDIT VIEW screen—turns the channel’s
dynamics processor on or off.
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 158).
You can set Ratio 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
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.
An expander can be handy when it’s used as a gating mechanism that makes unwanted
background noise quieter than it is in the original signal.
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.
VS2000OMUS.book 157 ページ ２００４年１０月２０日 水曜日 午後３時３分
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