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281
Adobe Premiere Pro Help
Applying Effects
Using Help
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Contents
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Index
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281
Compressor
Balances the dynamic range to create a consistent level throughout the
duration of the clip by increasing the level of soft sounds and decreasing the level of loud
sounds. Use the following controls for Compressor:
•
Threshold sets the level (between –60 and 0 dB) that the signal must exceed to invoke
compression. Levels that fall below the threshold are unaffected.
•
Ratio sets the ratio by which compression is applied, up to 8:1. For example, if the ratio
is 5:1, and the input level increases by 5 dB, the output increases by only 1 dB.
•
Attack sets the time (between 0.1 and 100 milliseconds) that the compressor takes to
respond to a signal that exceeds the threshold.
•
Release specifies the time (between 10 and 500 milliseconds) it takes for the gain to
return to the original level when the signal falls below the threshold.
•
Auto calculates the release time based on the incoming signal.
•
MakeUp adjusts the compressor’s output level (between –6 and 0 dB) to account for
loss in gain caused by compression.
Expander
Reduces all signals below the specified threshold to the set ratio. The result is
similar to the gate control but is more subtle. Use the following controls with Expander:
•
Threshold specifies a level in which the signal must fall to activate the expander. Levels
that exceed the threshold are unaffected.
•
Ratio sets the rate at which signals are expanded, up to 5:1. For example, if the ratio is
5:1, a level decrease of 1 dB is expanded by 5 dB, resulting in a much faster decrease of
the signal.
Limiter
Reduces clipping in audio clips that contain peaks in the signal. For example, by
leveling out peaks that exceed 0 dB in an audio file, the overall level of the audio doesn’t
have to be reduced below 0 dB to avoid clipping. Use the following controls with Limiter:
•
Threshold specifies the maximum level of the signal, between –12 and 0 dB. All signals
that exceed the threshold are reduced to the same level as the threshold.
•
Release specifies the time (between 10 and 500 milliseconds) required for the gain to
return to the normal level after a clip occurs.
SoftClip reduces clipping similar to Limiter but doesn’t use hard limiting. This control adds
an edge to some signals to better define them within an overall mix.
EQ
The EQ effect acts as a
parametric equalizer
, meaning that it controls frequency,
bandwidth, and level using multiple bands. The effect includes three fully parametric mid
bands, a high band, and a low band. The low and high bands are shelving filters, by
default. Gain is constant over frequency. The Cut control switches the low and high band
from shelving to cutoff filters. Gain is fixed to –12 dB per octave and is deactivated in
cutoff mode.
Use the graphical controls in the Custom Setup view, or adjust values in the Individual
Parameters view. In the Custom Setup view, you can control the parameters of the filter
bands in the Frequency window by dragging band handles. Each band includes a control
for Frequency and Gain. Mid bands include two additional controls for adjusting the Q-
factor.
