6.1.3.2. Filter types: Low-pass, Band-pass, High-pass and Notch
A filter can operate in various ways or modes. These modes are called
transfer functions
or
spectral responses
. In the MiniBrute 2 the filter can operate either as a low-pass filter, a
band-pass filter, a high-pass filter, or a notch filter.
In
low-pass
mode, the spectral contents below a given
cutoff frequency (shortened to
cutoff) remain unchanged, while partials above the cutoff are attenuated. The attenuation
is a function of the frequency where the higher the partial frequency, the greater the
attenuation. In other words, it is called a low-pass mode because it passes the low
frequencies below the cutoff and reduces the high frequencies above the cutoff. This
correlation of attenuation to frequency determines the filter’s slope, which is measured in
-dB/octave (i.e., the amount of attenuation applied to a partial with a frequency twice as
high as the cutoff).
In
band-pass
mode, the cutoff frequency becomes a band’s center frequency. Partials
within this band remain unchanged, while partials below or above the band’s range are
attenuated strongly.
In
high-pass
mode, partials above the cutoff frequency remain unchanged, while the
partials below the cutoff are attenuated.
How a low-pass filter affects the sound
How a band-pass filter affects the sound
How a high-pass filter affects the sound
Arturia - User Manual MiniBrute 2 - Basics of synthesis
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