Notch Filter Node

Standard notch filter, also called band-stop or band-rejection filter. It is the opposite of the Bandpass Filter Node: frequencies outside the give range of frequencies pass through, frequencies inside it are attenuated.

In other words, this Node can be used to attenuate/mute a specific frequency range (while the Bandpass Filter Node is used to attenuate/mute everything, except that specific frequency range).


AudioThe Audio line to filter.
Frequency-controlA Control input to automate the Frequency setting, in Hz, from 10 Hz to the Nyquist frequency. This input can be toggled from the Node settings panel.
Q-controlA Control input to automate the Q setting, from 0.0001 to 1000. This input can be toggled from the Node settings panel.


FrequencySets the effect center frequency (in Hz).
QSets the frequency band width. Greater values result in a smaller frequency band, and a sharper effect.
Filter orderRepresents the order of the differential equation describing the filter.


OutputThe filtered Audio.

Audio and Control lines (visualized with blue and purple, respectively) are both analogous to an analog signal. They can be used interchangeably, and, for example, an Audio output (blue) can be connected to a Control input (purple), or vice-versa.

Technical details

This Node has exactly 2 samples of latency (equals ~0.0045 milliseconds at 44.1 kHz).