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Chapter 6 Filter eects 13 9
Spectral Gate
Spectral Gate overview
Spectral Gate is an unusual lter eect that can be used as a tool for creative sound design.
It works by dividing the incoming signal into two frequency ranges—above and below a central
frequency band that you specify with the Center Freq and Bandwidth parameters. The signal
ranges above and below the dened band can be individually processed with the Low Level
and High Level parameters and the Super Energy and Sub Energy parameters. See Use Spectral
Gate on page 140.
Gain slider
Graphic
display
Center Freq. and
Bandwidth knobs
Sub Energy and
Low Level controls
Speed, CF Modulation,
and BW Modulation
sliders
Super Energy and
High Level controls
Threshold
slider
Spectral Gate parameters
•
Threshold slider and eld: Drag to set the threshold level that is used to divide frequency
ranges. When the threshold is exceeded, the frequency band dened by the Center Freq and
Bandwidth parameters is divided into upper and lower frequency ranges.
•
Speed slider and eld: Drag to set the modulation frequency for the dened frequency band.
•
CF (center frequency) Modulation slider and eld: Drag to set the intensity of center
frequency modulation.
•
BW (bandwidth) Modulation slider and eld: Drag to set the amount of bandwidth modulation.
•
Graphic display: Shows the frequency band dened by the Center Freq and
Bandwidth parameters.
•
Center Freq(uency) knob and eld: Rotate to set the center frequency of the band that you want
to process.
•
Bandwidth knob and eld: Rotate to set the width of the frequency band that you want
to process.
•
Super Energy knob and eld: Rotate to set the level of the frequency range above the threshold.
•
High Level slider and eld: Drag to mix the frequencies of the original signal—above the
selected frequency band—with the processed signal.
•
Sub Energy knob and eld: Rotate to set the level of the frequency range below the threshold.
•
Low Level slider and eld: Drag to mix the frequencies of the original signal—below the
selected frequency band—with the processed signal.
•
Gain slider and eld: Drag to set the overall output level.