Extron Electronics DMP 44 LC User Guide - Manual (Page 26)

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.
High Pass
The high pass filter is the opposite of the low pass filter. All frequencies below the
specified frequency are attenuated allowing higher frequencies to pass.
In the figure below, the frequencies lower than the specified frequency, 1 kHz, are
attenuated leaving the higher frequency response flat.
Figure 13. High Pass Filter Response Curve
Low Pass
The low pass filter is the opposite of the High Pass filter. All frequencies above the
specified frequency are attenuated allowing lower frequencies to pass.
In the figure below, the frequencies higher than the specified frequency, 10 kHz, are
attenuated leaving the lower frequency response flat.
Figure 14. Low Pass Filter Response Curve
DMP 44 LC • Operation 20