6.8 Equalizer

Equalizer

A simple Parametric Equalizer.

Graph

  • X axis: shows frequencies from 20 Hz to 20,000 Hz, divided into octaves (this makes the X axis appear nonlinear).

  • Y axis: shows amplitude from -18 dB to 18 dB (displayed linearly with respect to decibels).

  • Analyze:

    • In (Button): toggle display of input signal on graph (before signal alterations)

    • Out (Button): toggle display of output signal on graph (after signal alterations)

The bubbles on the graph can be used to plot Cutoff frequency* and Gain*. Using the scroll wheel on these filters will alter their Bandwidth/Resonance*. *These terms are explained in the Filter Settings subsection of this page.

Filters

You'll notice that there are 8 columns with numbers 1-8, these represent 8 different filters (of 5 filter types) that can be used to alter the input signal.

Filter Settings

  • : toggles their respective filters on/off. (Notice the symbols next to the numbers)

  • : adjusts slope of Highpass (1) and Lowpass (8) Filters, respective to each filter.

  • : adjusts gain of Filters 2 through 7, respective to each Filter.

  • Row of Knobs:

    • Top Row: adjusts the Cutoff Frequency of their respective filter

    • Bottom Row: adjusts the Resonance (Filters 1, 2, 7, and 8) and Bandwidth (Filters 3, 4, 5, and 6) of their respective filters.

Filter Types

  • 1: This is a Highpass Filter, it removes frequencies below the cutoff frequency.

  • 2: This is Low Shelf Filter, it can either boost or reduce frequencies below the cutoff frequency.

  • 3 through 6: These are Peak Filters, they can either boost or reduce frequencies around the cutoff frequency.

  • 7: This is a High Shelf Filter, it can either boost or reduce frequencies above the cutoff frequency.

  • 8: This is a Lowpass Filter, it removes frequencies above the cutoff frequency.

Other

  • In (Slider): adjusts the gain of the input signal.

  • Out (Slider): adjusts the gain of the output signal.