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Chapter 2 Delay eects 65
Edit lter cuto in the Tap display
In Cuto view, each tap actually shows two parameters: highpass and lowpass lter
cuto frequency.
m Drag the cuto frequency line—the upper line is lowpass and the lower line is highpass—to
independently adjust lter cuto values. Both cuto frequencies can be adjusted simultaneously
by dragging in the area between them.
When the highpass lter cuto frequency value is lower than that of the lowpass cuto
frequency, only one line is shown. This line represents the frequency band that passes through
the lters—in other words, the lters act as a bandpass lter. In this conguration, the two lters
operate serially, meaning that the tap passes through one lter rst, then the other.
If the highpass lter’s cuto frequency value is above that of the lowpass lter cuto
frequency, the lter switches from serial operation to parallel operation, meaning that the
tap passes through both lters simultaneously. In this case, the space between the two cuto
frequencies represents the frequency band being rejected—in other words, the lters act as a
band-rejection lter.