Vocoder - Korg MMT microKORG XL+ Owner's Manual

Arpeggiator (ARPEGGIATOR)
The arpeggiator automatically generates an arpeggio (broken chord) when
you hold down a chord on the keyboard. For programs that use two tim-
bres, you can apply the arpeggiator to either or both timbres. This is a step
arpeggiator with six arpeggio types.

Vocoder

A vocoder analyzes the frequency characteristics of one signal called the
"modulator" (such as a human voice input via a mic) and applies these
characteristics to a filter that is processing a different signal called the "car-
rier" (such as an oscillator waveform), thus producing distinctive effects
such as an instrument that appears to be talking.
The microKORG XL+ contains a sixteen-band vocoder that can simulate
not only the classic vocoder sounds of the past but also create original
vocoder sounds where the tonal character or the level of each band can be
controlled.
As shown in the illustration below, the vocoder consists of the carrier (the
signal being modified), the modulator (the signal that controls the modify-
ing), and the vocoder section itself.
Audio In
Vocoder Sw= ON
Synth
Timbre 1
Carrier
Vocoder
Modulator
Vocoder Sw= ON & Modulator AudioSrc =Timbre2
Synth EQ
Timbre 2
Vocoder
Gate Send
Band16
Threshold
Band1
Audio In
GATE
ANALYSIS
Timbre2
FILTER
Modulator
LEVEL
RESONANCE
Timbre1
SYNTHESIS
Carrier FILTER
Timbre2
LEVEL
CUTOFF (FC MOD)
FORMANT SHIFT
Vocoder section (VOCODER)
This consists of two sets of sixteen bandpass filters (the analysis filter and
the synthesis filter) and an envelope follower. The audio signal input to the
modulator is sent to sixteen filters (the analysis filter), and an envelope fol-
lower will detect the volume envelope (time-variant change) of each fre-
quency band.
The carrier signal is sent to a separate set of sixteen filters (the synthesis
filter), and the envelope detected from the analysis filter is used to control
the volume of each band in the synthesis filter, thus varying the tonal char-
acter of the carrier signal and producing the impression that the carrier sig-
nal is talking. It is also possible to shift the frequencies of the carrier
bandpass filter. This allows you to raise or lower the frequency response
while preserving the character of the modulator, creating dramatic changes
in the sound.
Editing the sound
EQ
MASTER FX1
HPF
HPF
LEVEL
DIRECT
E.F. SENS
LEVEL
ENVELOPE
FOLLOWER
To Timbre 1
EQ
Band. LEVEL PAN
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