ARTURIA – ARP 2600 V – USER MANUAL
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The ARP2600 V noise module
5.1.2
The filter or VCF
The audio signal generated by an oscillator (the waveform) is next generally
directed to a filter module (Voltage Controlled Filter). It is this module that we
use to control the sound by filtering (by subtraction, which explains the name
given to this type of synthesis) the harmonics situated around a cut-off
frequency. It can be considered to be a sophisticated equalizer that reduces,
depending on the case, the high or low frequencies of a sound.
The removal of undesirable frequencies at the cut-off frequency is not done
suddenly but progressively, depending on the filtering slope. This filtering slope
is expressed in decibels per octave (or dB/Oct). The filters used in classic
analog synthesizers have 24 dB/Oct or 12 dB/Oct slopes.
The ARP2600 V filter module
