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Chapter 6 Filter eects 13 0
A short introduction to formants
A formant is a peak in the frequency spectrum of a sound. In the context of human voices,
formants are the key component that enables humans to distinguish between dierent vowel
sounds—based purely on the frequency of the sounds. Formants in human speech and singing
are produced by the vocal tract, with most vowel sounds containing four or more formants.
U/V detection parameters
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Sensitivity knob: Rotate to determine how responsive U/V detection is. Turn to the right for
higher settings, where more of the individual unvoiced portions of the input signal are
recognized. When high settings are used, the increased sensitivity to unvoiced signals can
lead to the U/V sound source being used on the majority of the input signal, including voiced
signals. Sonically, this results in a sound that resembles a radio signal that is breaking up and
contains a lot of static, or noise. (The U/V sound source is determined by the Mode menu, as
described below.)
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Mode menu: Choose the sound sources used to replace the unvoiced content of the
input signal.
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Noise: Uses noise alone for the unvoiced portions of the sound.
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N + Syn (Noise + Synthesizer): Uses noise and the synthesizer for the unvoiced portions of
the sound.
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Blend: Uses the analysis signal after it has passed through a highpass lter for the unvoiced
portions of the sound. The Sensitivity parameter has no eect when this setting is used.
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Level knob: Rotate to set the volume of the signal used to replace the unvoiced content of the
input signal.
Important: Be careful with the Level knob, particularly when using a high Sensitivity value, to
avoid internally overloading the EVOC 20 TrackOscillator.