Table 3. The low-pass filter types, cutoff frequencies (f
c
) and order of analog and digital low-pass filters as a function of signal types.
Signal type
Analog filters (hardware)
Digital filters (software)
Type
f
c
(kHz)
Order
Type
f
c
(Hz)
Order
Audio
Elliptic
7.4
8
_
_
_
ePGG
Butterworth
5.3
8
_
_
_
Airflow
Butterworth
2.2
8
Bessel
60
4
Pio
Butterworth
2.2
8
Bessel
60
4