Extron electronic DMP 64 manual Parametric Equalizer, Parametric Filter Dialog Box, 1000 Hz

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