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Table Of Contents
EVOC 20 PolySynth Formant Filter Parameters Overview
The Formant Filter display is divided in two by a horizontal line. The upper half applies
to the Analysis section and the lower half to the Synthesis section. Parameter changes
are instantly reflected in the Formant Filter display, providing invaluable feedback about
what is happening to the signal as it is routed through the two formant filter banks.
Formant Stretch knob
Resonance knob
Formant Shift knob
Highest button
Lowest button
Low Frequency
parameters
High Frequency
parameters
High and Low Frequency parameters: Determine the lowest and highest frequencies
allowed to pass by the filter section. Frequencies that fall outside these boundaries will
be cut.
The length of the horizontal blue bar at the top represents the frequency range for
both analysis and synthesis (unless Formant Stretch or Formant Shift are used, as
described below). You can move the entire frequency range by dragging the blue
bar. The silver handles on either end of the blue bar set the Low Frequency and High
Frequency values, respectively.
You can also drag vertically in the numeric fields to adjust the Low and High frequency
values.
Lowest and Highest buttons: Click to determine whether the lowest and highest filter
bands act as bandpass filters—like all of the bands between them—or whether they
act as lowpass or highpass filters, respectively.
Lowest button: Click to determine whether the lowest filter band acts as a bandpass
or highpass filter. In the Bandpass setting, the frequencies below the lowest bands
and above the highest bands are ignored. In the Highpass setting, all frequencies
below the lowest bands are filtered.
152 Chapter 7 EVOC 20 PolySynth