
4.3 The Filter Module 34
Amplitude (dB)
Frequency (Hz)
Q=10
Q=4
Q=2
Q=1
Cutoff
Frequency
0dB
−3dB
Slope (dB/Oct)
Figure 12: Frequency response of the low-pass filter.
4.3.2 Resonant High-Pass Filter
Amplitude (dB)
Frequency (Hz)
0dB
−3dB
Cutoff
Frequency
Slope (dB/Oct)
Q=2
Q=1
Q=4
Q=10
Figure 13: Frequency response of the high-pass filter.
The high-pass resonant filter works exactly in the opposite manner as the low-pass resonant
filter by removing the frequency component of a signal located below the cutoff frequency while
leaving those above the cutoff frequency unchanged. Similarly to the low-pass filter, the Q-factor
controls the emphasis of frequencies located around the cut-off frequency.
4.3.3 Band-Pass Filter
The behavior of a band-pass filter is to let the frequencies in a band located around a center fre-
quency and to attenuate the frequencies outside of this band as shown in Figure 14. The bandwidth
of the band-pass filter is set with the Q knob while the center frequency is set with the Cutoff knob.
The Order control sets the order of the filter. This parameter affects the slope of the roll-off on
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