Arturia ARP2600 V, Руководство пользователя

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ARTURIA – ARP2600 V – USER’S MANUAL 59
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, de-
pending 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 progres-
sively, 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 prop-
erties:
•
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