decibels per octave (or dB/oct). Most filters used in classic analog synthesizers have 24 dB/oct or 12 dB/oct slopes.
The removal of undesirable frequencies at the cut-off frequency
On the Jupiter-8V, you have access to a type of filtering with a 24 dB/Oct slope and to a type of filtering with a 12 dB/Oct slope. Let’s have a look at some of its properties:
8.1.3.1 High-Pass Filter (HP Filter)
The high-pass filter acts symmetrically to that of the low pass filter. It eliminates frequencies below the cut-off frequency. The High-pass filter on the Jupiter-8 is non resonant.
Non-resonant high-pass filter
8.1.3.2 The low-pass filter (LPF)
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 through unchanged. Depending on the settings we will hear the sound becoming more or less “brilliant”, more or less “dampened”.
This is the type of filtering that you will find most often on synthesizers that use subtractive synthesis. It can be found on most of the recent analog and digital synthesizers.
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