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Chapter 8 EVOC 20 PolySynth 136
The more bands a vocoder oers, the more precisely the original sound’s character will be
reproduced by the synthesis lter bank. EVOC 20 PolySynth provides up to 20 bands per
bank. See EVOC 20 block diagram on page 153 for a detailed image of the EVOC 20 PolySynth
signal path.
EVOC 20 PolySynth interface
The EVOC 20 PolySynth interface is divided into six main parameter sections.
U/V Detection parameters
Modulation parameters
Synthesis parameters
Output parameters
Formant Filter
parameters
Sidechain Analysis
parameters
•
Sidechain Analysis parameters: Determine how the input signal is analyzed and used by the
EVOC 20 PolySynth. See EVOC 20 PolySynth analysis parameters on page 137.
•
U/V Detection parameters: Detect the unvoiced portions of the sound in the analysis signal,
improving speech intelligibility. See EVOC 20 PolySynth (U/V) detection parameters on
page 138 .
•
Synthesis parameters: Control the polyphonic synthesizer of the EVOC 20 PolySynth. See
EVOC 20 PolySynth synthesis parameters overview on page 140.
•
Formant Filter parameters: Congure the analysis and synthesis lter banks. See EVOC 20
PolySynth formant lter on page 14 6.
•
Modulation parameters: Modulate the synthesizer and lter banks—through two LFOs. See
EVOC 20 PolySynth modulation parameters on page 148.
•
Output parameters: Congure the output signal of the EVOC 20 PolySynth. See EVOC 20
PolySynth output parameters on page 149.