Extron electronics DMP 64 User Manual page 44

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 can be set
to a different frequency creating a five band parametric equalizer. The control boosts or
cuts the center frequency. By changing the Q value, the range of affected frequencies is
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, see the following filter block (see figure 29)
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
+12 dB over a Q of 1.0. Note the markers on either side of the peak frequency are at
300 Hz on the left and 3000 Hz on the right, a bandwidth of about 2700 Hz.
Figure 29. Parametric Filter Dialog Box, 1000 Hz
The dialog box (see figure 29) shows the frequency curve for the single active filter. To add
its effect to the overall frequency response, remove the bypass on the other filters.
DMP 64 • Software Control 38