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Parametric (Equalizer)
The parametric filter is a frequency equalizer that offers control of all parameters, including
amplitude (the amount of gain/boost or gain reduction/cut applied), center frequency
(frequency), and range of affected frequencies (Q) around the center frequency.
Up to five parametric filters can be placed in the filter box at one time. Each may be set
to a different frequency creating a five band parametric equalizer. The control will boost or
cut the center frequency, and by changing the Q value, the range of affected frequencies
can be widened or narrowed around the center frequency. In general, a higher Q value
results in a narrower affected bandwidth.
To demonstrate how Q affects the filter, the following filter block (see figure 30) containing
five parametric filters centered at different frequencies but with the same Q of 1.0. The
filter in focus (
c
) has a center frequency of 1000 Hz boosting that frequency +12dB over
a Q of 1.0. Note the markers on either side of the peak frequency are at about 300Hz on
the left and 3000 Hz on the right, a bandwidth of about 2700 Hz.
Figure 30. Parametric Filter at 1000 Hz, Q: 1.000
DMP128 • Software Control 39