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Highpass Filter Node

Standard resonant highpass filter with 12dB/octave rolloff. Frequencies below the cutoff are attenuated; frequencies above it pass through.

In other words, this Node can be used to only keep the higher frequencies of an audio source, and attenuate/mute the rest (e.g. to create an “elevator-like music” effect).

Inputs

Audio The Audio line to which the filter is applied.
Frequency-control A 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-control A Control input to automate the Q setting, from 0.0001 to 1000. This input can be toggled from the Node settings panel.

Settings

Frequency The cutoff frequency.
Q Sets how peaked the frequency is around the cutoff. The greater the value, the greater the peak.
Filter order Sets the order of the differential equation describing the filter. In essence, this sets how many times the filter is applied.

Outputs

Audio The filtered audio stream.

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).

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