Extron Electronics MVC 121 Plus User Guide - Manual (Page 27)

To demonstrate how Q affects the filter, see the following filter block below containing
three parametric filters centered at different frequencies but with the same Q of 1.0. The
filter in focus (b) 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 200 Hz on the
left and 5000 Hz on the right, a bandwidth of about 4800 Hz.
Figure 10. Parametric Filter Dialog Box, 1000 Hz
The above dialog box 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.
Figure 11. All Parametric Filters Active
The overall frequency response is now shown above as a solid red line with the filter in
focus, located in row 2, shown in the color of its table row.
The parametric filter allows frequency selection accurate to 0.1 Hz and either 6 or 12 dB of
slope. Notice at the specified frequency (100 Hz) the signal is 3 dB down, typical operation
for high pass filters. The 3 dB down point will remain constant regardless of the slope
setting. Only the steepness of the frequency attenuation curve will change.
MVC 121 Plus • Operation 21