Filter Sound Files : LPF & HPF, BPF, BRF (Scoop).
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Figure 54 : The parametric equalizer (figure 56) is applied to the highlighted section of the wave file.
In professional mixing boards, parametric equalizers often provide control of the bass (low pass filters), treble (high pass filters), midrange (band pass filters & band reject filters), & midrange sweep. Some parametric equalizers, especially computer plugins, have frequency selectable controls for every parameter. Bass, midrange, and treble all have sweep controls that allow user selectable frequency points.
Figure 55 : Gold Wave graphic equalizer.
Graphic equalizers (figure 55), especially the the larger ones, give a large amount of control over the frequency spectrum, but they have fixed frequency points an don’t allow fine tuned user selectable frequency points.
Figure 56 : Digilogue BlueParamEQ control settings for the parametric equalizer.
Band pass filters (BPFs) are midrange (figure 56) controls with a gain above zero. Band reject filters (BRFs) are midrange (figure 56) controls with a gain below zero.
Figure 57 : Graphical representation of the Digilogue BlueParamEQ control settings in figure 56.
Q controls the width of the midrange cut or boost. It is a common control in stand alone units, but rarely found in mixing boards. For more information about the Q control, see the BPF and BRF web pages.