Adobe Premiere Pro CS4 - Manual (Page 340)

334 USING ADOBE PREMIERE PRO CS4
Effects and transitions
Last updated 11/6/2011
value, the DeHummer filters the 60 Hz frequency along with three harmonic frequencies (120 Hz, 240 Hz, and 480
Hz), for a total of four frequencies filtered, hence the value of 4#. Higher values require more processing power.
Delay effect
The Delay effect adds an echo of the audio clip’s sound that plays after a specified amount of time. This effect is
available for 5.1, stereo, or mono clip.
Delay Specifies the amount of time before the echo plays. The maximum is 2 seconds.
Feedback Specifies a percentage of the delayed signal to be added back into the delay to create multiple decaying
echoes.
Mix Controls the amount of echo.
DeNoiser effect
The DeNoiser effect automatically detects tape noise and removes it. Use this effect to remove noise from analog
recordings, such as magnetic tape recordings. This effect is available for 5.1, stereo, or mono clip.
Noisefloor Specifies the level (in decibels) of the noise floor as the clip plays.
Freeze Stops the noise floor estimation at the current value. Use this control to locate noise that drops in and out of a clip.
Reduction Specifies the amount of noise to remove within a range of –20 to 0 dB.
Offset Sets an offset value between the automatically detected noise floor and the value defined by the user. This is
limited to a range between –10 and +10 dB. Offset allows additional control when the automatic denoising is not
sufficient.
Dynamics effect
The Dynamics effect provides a set of controls that can be combined or used independently to adjust audio. Use either
the graphical controls in the Custom Setup view, or adjust values in the Individual Parameters view. This effect is
available for 5.1, stereo, or mono clips.
For a video tutorial on using the Compressor in the Dynamics effect, see Dynamics Compressor by Curt Wrigley.
AutoGate Cuts off a signal when the level falls below the specified threshold. Use this control to remove unwanted
background signals in recordings, such as a background signal in a voice-over. Set the gate to close whenever the
speaker stops, thereby removing all other sounds. The LED display colors indicate the gate’s mode: open (green),
attack or release (yellow), and closed (red). Use the following controls for Gate:
• Threshold Specifies the level (between –60 and 0 dB) that the incoming signal must exceed to open the gate. If the
signal level falls below this level, the gate closes, muting the incoming signal.
• Attack Specifies the time the gate takes to open after the signal level exceeds the threshold.
• Release Sets the time (between 50 and 500 milliseconds) the gate takes to close after the signal level has fallen below
the threshold.
• Hold Specifies the time (between 0.1 and 1000 milliseconds) the gate stays open after the level has fallen below the
threshold.
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.