
4.3 The Filter Module 35
Amplitude (dB)
Frequency (Hz)
0dB
−3dB
Center
Frequency
Q=10
Q=4
Q=2
Q=1
Band Width (Q=1)
Figure 14: Frequency response of the band-pass filter.
both sides of the center frequency. For a second order filter the slope is -6dB/Oct while for a fourth
order filter it is -12dB/Oct.
4.3.4 Notch Filter
Amplitude (dB)
Frequency (Hz)
0dB
−3dB
Center
Frequency
Band Width (Q=1)
Q=1
Q=2
Q=4
Q=10
Figure 15: 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
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