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6.2. Elements of filter design and their controls
6.2.1. Filter type
A filter's
type
or
mode
determines where in the frequency spectrum it does its work. With
a few exceptions, filters are named for the types of frequencies they allow through (pass),
not for the frequencies they remove (cut). These include:
• Low Pass: The most common filter in synthesizers, the Low Pass (LP) filter allows
lower frequencies through, while attenuating higher frequencies. This mimics
how objects and materials in the acoustic world absorb higher frequencies more
rapidly than lower ones, so it sounds very natural to our ears.
• High Pass: A High Pass (HP) filter lets higher frequencies through and attenuates
lower frequencies. When a filter like this is used in audio equipment like
microphones and preamplifiers to remove low-frequency rumble and handling
noise, it is sometimes given the more practical name "low cut".
• Band Pass: Made by combining LP and HP circuits, the Band Pass (BP) filter
allows a certain range of frequencies through, and attenuates above and below
that range.
Like the original SEM filter, the MiniFreak's Analog Filter can be set to three types: Low Pass,
High Pass, and Band Pass. These are chosen with the Analog Filter's Type button, with white
LEDs to indicate the current choice.
If you need more filter options be sure to check the filters available on OSC 2 in the
MiniFreak, but note that these are digital.
6.2.2. Cutoff
The
cutoff frequency
, or simply
cutoff
, is where the filter begins to do its work. It can also
be called the corner frequency or center frequency or sometimes even just frequency. As
mentioned above, the cutoff knob is the single most used filter control, and often the most
used control on any analog synth.
The Cutoff knob on the MiniFreak Analog Filter ranges from roughly 20 Hz to 20 kHz.
Depending on the filter type, extreme settings can eliminate all of the audio signal, muting
the synth.
The Type button and its
LEDs
41 Arturia - User Manual MiniFreak - The Analog Filter
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