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5.3.4. Phaser Filter
A
phase shifter
(or
phaser
) creates an effect similar to comb filtering, but different in sonic
character. It's created by running an input signal through a series of
all pass filters
. These
filters don't remove any frequencies, but they do shift the phase of the signal. Recombining
these phase-shifted signals with the original creates unevenly spaced notches. The more of
these filters the circuit contains (called the number of
poles
or
stages
), the more notches are
created.
Sweeping the phase shift over time produces the classic Phaser effect that's available in
the
Digital Effects chapter [p.8], but because the Phaser Filter only sweeps when and how
modulated, a wider variety of unusual effects are available.
Cutoff: controls the frequency range of the phaser's notches, emphasizing high vs. low
frequencies.
Feedback: intensifies the effect by feeding back some of the filtered content into the filters
again.
Poles: defines how many notches will be created by the Phase Filter. Each pair of poles adds
a notch, so 2 poles gives one notch and 12 poles creates six notches.
Choose a number of Poles and then slowly sweep the Cutoff. How many of the frequency notches
can you hear distinctly for each Poles setting? As you add more filters, it becomes trickier...
Arturia - User Manual MiniFreak - The Digital Oscillators 38
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