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A Notch Filter is a frequence lock filter or frequence trap to eliminate frequences within a small frequence range. A notch is placed in the frequency band. These notch filters have high quality factor (Q factor).
In music electronics notch filters are used e.g. as tunable (that means with controllable frequency) band suppressors (filters). These filters are often called band suppressors, which leads to misunderstandings, because a notch filter only suppresses a small frequency range but never a larger frequency band.