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28 Parameters
Amplitude (dB)
Frequency (Hz)
0dB
−3dB
Center
Frequency
Q=10
Q=4
Q=2
Q=1
Band Width (Q=1)
Figure 12: Frequency response of the band-pass filter.
Notch Filter
Amplitude (dB)
Frequency (Hz)
0dB
−3dB
Center
Frequency
Band Width (Q=1)
Q=1
Q=2
Q=4
Q=10
Figure 13: Frequency response of the notch filter.
The notch filter, does essentially the opposite of the band-pass filter. It attenuates the frequen-
cies in a band located around the center frequency and leaves those outside of this band unchanged
as shown in Figure 28. The Frequency knob is used adjust the center frequency and the Resonance
knob sets the bandwidth of the notch. Note that the center frequency is totally removed from the
spectrum of the output signal of the filter.
28


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