5.4
The Effects View
53
5.4.1
Equalizer
The
Equalizer
module provides equalization over the low, mid, and high frequency bands. It is
composed of a low shelf filter, two peak filters, and a high shelf filter in series, labelled
LF
,
LMF
,
HMF
, and
HF
respectively.
The functioning of the low shelf filter is depicted in Figure 31. The filter applies a gain factor to
low frequency components located below a cutoff frequency while leaving those above unchanged.
The cutoff frequency of this filter is adjusted using the
Freq
knob and can vary between 40 and 400
Hz. The
Gain
knob is used to adjust the gain factor applied to the signal in a
±
15dB range. In
its center position there is no attenuation (0 dB). Turning it clockwise boosts the amplitude of low
frequencies while turning it counter-clockwise reduces it.
The high frequency content of the signal is controlled with a high shelf filter that works in
the opposite manner as the low shelf filter as illustrated in Figure 31. The filter applies a gain
factor to components located above a cutoff frequency while leaving those below unchanged. The
cutoff frequency of this filter, located above 1 kHz, is adjusted with the help of the
Freq
knob
while the gain factor applied to the signal, in a
±
15dB range, is adjusted using
Gain
knob. In its
center position there is no attenuation (0 dB). Turning it clockwise boosts the amplitude of high
frequencies while turning it anti-clockwise reduces it.
Figure 31: Low and high shelf filters.
The
Equalizer
module features two peak filters, labeled
LMF
and
HMF
, allowing to shape the
signal in two frequency bands as illustrated in Figure 32. The filters apply a gain factor to frequency
components in a band located around the cutoff frequency of the filters. This cutoff frequency is
adjusted using the
Freq
knob and can vary between 100 Hz and 10 kHz. The gain factor applied
a the cutoff frequency is controlled by the
Gain
knob and can vary in a
±
15 dB range. When
in its center position there is no attenuation (0 dB). Turning it clockwise boosts the amplitude of
frequencies located around the cutoff frequency while turning it anti-clockwise reduces it. The
