General description
The notch bank removes up to eight discrete disturbing sinusoid frequencies. There are two main types of operation of the notch bank: automatic and manual. In the automatic mode the notch bank detects the sinusoid frequencies automatically and allocates a notch filter to remove the sinusoid. In the manual mode the user can give the center frequencies of the notch filters.
Parameters
Number of filters
This is the maximum number of notch filters. If the notch bank is in the automatic mode and maximum number of filters is not needed, then all filters are not activated.
Manual
This is the switch to select the manual or automatic mode.
Filter type
There are three types of filters (light, normal and heavy). A longer filter needs correspondingly more computing power.
Filter type
Length
Stopband width
Stopband attenuation
Light
200 taps
150 Hz
30 dB
Normal
400 taps
80 Hz
30 dB
Heavy
800 taps
70 Hz
35 dB
Adaptation speed
This parameter tells how often the situation is analyzed. The number of notch filters and their center frequencies are decided based on the analysis. This parameter is not active in the manual mode.
Filter1-Filter8
These are the stopband center frequencies to be set by the user in the manual mode.