5.3
The Synth View
41
Figure 21: Synchronization of the oscillator.
The cutoff frequency and resonance of the filters can be modulated with
different modulation sources. The
Key
knob allows one to adjust the amount
of variation with the pitch signal from the keyboard while the
Env
knob is
a gain control applied to the signal received from the
Filter Env
module.
These parameters can also be modulated by the signal from the LFO using
the
Filter Freq
and
Filter Res
knobs on the
LFO
module.
Let’s now have a closer look at the different filter types available.
Resonant Low-Pass Filter
A low-pass filter is used to remove the higher spectral components of the
signal while leaving the lower components unchanged. The frequency at
which attenuation begins to take effect is called the
cutoff
frequency and
it is controlled using the
Frequency
knob. In a resonant filter, frequencies
located around the cutoff frequency can also be emphasized by an amount
called the
quality factor
or
Q-factor
of the filter as illustrated by Figure 22.
This parameter is adjusted using the
Resonance
knob. The higher the Q-
factor, the louder and sharper the response of the filter around the cutoff
frequency. When the Q-factor is set to 1 (
Q
knob fully turned to the left),
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