Band EQ channel node

A 14-band equalizer which filters audio input channels in the same way that a conven…

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This CHOP is a 14-band equalizer which filters audio input channels in the same way that a conventional band equalizer uses a bank of sliders to filter fixed-frequency bands of sound.

The CHOP has 14 bands from 10Hz to 82kHz with one parameter per band. The 20Hz band ranges from 14 Hz to 28 Hz (1 octave centered at 20Hz). These bands may be be all shifted up or down in frequency with the Base Shift parameter. The shape of each band filter may also be specified as a Gaussian filter (smooth falloff, where the bands overlap) or a Box filter (sharp cutoff, where the bands don’t overlap).

The first input contains the channels to be filtered.

The second input contains optional channels called Filter Animation Channels, that override the frequency parameters of the CHOP. They replace the control channels in the CHOP dialog box (b10, b20…), and can be used to animate the filter parameters over the interval of the CHOP. To override a parameter with an Filter Animation Channel, it must have the exact same name as the parameter’s channel. To control the 40Hz band, the channel in the second input must be named “b40”.

Filter Animation Channels are evaluated at the beginning of every Filter Chunk that is processed. As the chunk size decreases, the rate at which your parameters can change increases, but the low frequency sound quality degrades. The first input and the second input should have the same start-end interval.

This CHOP can be time sliced to operate on audio in realtime.