Band-stop filters

Frequenzgang

The bandwidth Band-stop filters 1: in the stop band of the band-stop filter is defined by the cut-off frequencies Band-stop filters 2: and Band-stop filters 3:. They are defined as the frequencies at which the amplitude has dropped by 3dB (~0.707). When parameterizing the band-stop filter, the bandwidth can be defined by specifying the quality factor P-AXIS-00080 (filter[i].guete). The quality factor is the ratio of the characteristic filter frequency by the bandwidth Band-stop filters 4::

Band-stop filters 5:

With a higher Q factor, the frequency range Band-stop filters 6: becomes smaller. The following relationship (geometrical mean) exists between the characteristic frequency of the band-stop filter and the cut-off frequencies Band-stop filters 7: and Band-stop filters 8: :

Band-stop filters 9:

The filter prototype P-AXIS-00153 has only a minor influence on the filter behavior of band-stop filters.

Band-stop filters 10:
Figure 1- 6 : Amplitude-frequency response of band-stop filters (4th order, quality = 1)
Band-stop filters 11:
Figure 1-7: Amplitude response of band-stop filters as a function of the specified quality factor P-AXIS-00080 (2nd order, characteristic frequency fg_f0 = 20 Hz)