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Chapter 14 Ultrabeat 350
Set Ultrabeat’s lter type
Ultrabeat’s lter can operate in several modes, allowing specic frequency bands to be ltered
(cut away) or emphasized.
m To select a lter type, click one of the following buttons:
•
LP (lowpass): This lter type allows frequencies that fall below the cuto frequency to pass.
When set to LP, the lter operates as a lowpass lter. The slope of the lter can be set to 12 or
24 dB/octave in LP mode.
•
HP (highpass): This lter type allows frequencies above the cuto frequency to pass. When set
to HP, the lter operates as a highpass lter. The slope of the lter can be set to 12 or 24 dB/
octave in HP mode.
•
BP (bandpass): The frequency band directly surrounding the center frequency (set with the
Cuto knob) is allowed to pass. All other frequencies are cut. The Resonance parameter
controls the width of the frequency band. The bandpass lter is a two-pole lter with a slope
of 6 or 12 dB/octave on each side of the center frequency of the band.
•
BR (band rejection): The frequency band directly surrounding the center frequency (set with
the Cuto knob) is rejected, while the frequencies outside this band can pass. The Resonance
parameter controls the width of the rejected frequency band.
Filter type buttons
Filter slope buttons
Set Ultrabeat’s lter slope
Most lters don’t completely suppress the portion of the signal that falls outside the frequency
range dened by the Cuto parameter. Frequencies that are located close to the cuto frequency
are generally reduced less than those that are farther away. The higher the slope value, the more
apparent the level dierence is between frequencies that are near to the Cuto frequency and
those that are farther away from it.
m Click the 12 dB or 24 dB button. The slope (curve) chosen for the Filter expresses the amount
of rejection in decibels per octave. The steeper the slope, the more severely the level of signals
below the cuto frequency is aected in each octave.
Filter type buttons
Filter slope buttons