Arturia ARP2600V Manuel d'utilisateur télécharger pdf (Page 67)

ARTURIA – ARP2600– USER’S MANUAL 67

The ARP2600 V noise module

6.1.2 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

The ARP 2600 V offers two types of slope: 24 and 12 dB/Oct slopes.

On the ARP2600 V, you have access to four types of filtering. Let’s have a look at some

of his properties:

• The low-pass filter (LPF) progressively removes high frequencies above the assigned

frequency limit (the cut-off frequency) and allows the sound below the cut-off to pass

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Arturia ARP2600V Manuel d'utilisateur Page 67