Chapter 8. Using Voice Modulator; How Voice Modulator Work - Roland JP-8080 Owner's Manual

Chapter 8. Using Voice Modulator

The term "Voice Modulator" collectively indicates the three functions "formant filter," "filter bank," and "vocal
morph control."

How Voice Modulator Work

Formant Filter
A formant filter analyzes "a human voice" (an audio signal)
that is input, and uses multiple band pass filters to simulate
the effects of throat shape or mouth movement. Instead of
the vibrations of the vocal chords, an "instrumental sound"
is input, is creating an impression as though the instrument
were talking.
The Voice Modulator of the JP-8080 provide an Inst Input
for inputting the "instrumental sound," and a Vocal Input
for inputting the "human voice." In order to use the for-
mant filter, you must simultaneously input an "instrumen-
tal sound" and a "human voice."
As shown in the following diagram, the JP-8080 provides
band pass filters for each frequency range, and twelve filters
make up one set. (Two sets are provided.) Each of these two
sets of band pass filters have the same characteristics.
A "human voice" is input to the Vocal Input and analyzed
by frequency band, and the amplitude of each band is
detected. An "instrumental sound" is input to the Inst
Input, and similarly disassembled into frequency bands.
The sound which has been processed through the filters of
the Inst Input is modulated by the amplitudes detected by
the Vocal Input filters, producing the impression that the
instrumental sound is talking.
Inst
Input
Vocal
Input
Band Pass
Detector
Filter
Band Pass
Detector
Filter
Band Pass
Detector
Filter
Band Pass
Detector
Filter
When an instrumental sound is input to the Vocal Input, the
amplitude of that instrumental sound will modulate the
sound from the Inst Input, which will produce yet a differ-
ent effect from when a voice is used to modulate the sound.
Try inputting break beats or percussion instrument sounds.
As the "instrumental sound," you can use not only the
Upper patch or Lower patch of the JP-8080, but also any
sound that is input from the EXT IN INST/LOWER jack.
The optimum effect will be produced with sustain-type
sounds which contain large numbers of overtones.
As the "audio signal," you can use the input from the MIC
jack or the input from the EXT IN VOCAL/UPPER jack.
Filter Banks
When the algorithm (p.108) is set to "FLT BANK WIDE" or
"FLT BANK NARROW," the two sets of filters can be used
as volume adjustments (filter banks) for each frequency
band.
If the filters are used as a filter bank, Inst Input and Vocal
Input will have the same function, and can be used as stereo
input or stereo output. In this case, Inst Input will be left (L)
and Vocal Input will be right (R). Of course, it is also possi-
ble to use this with input only to one side.
Formant Filter
Band Pass Amplitude
Filter modulation
Band Pass Amplitude
Filter
modulation
Band Pass Amplitude
Filter modulation
Band Pass
Amplitude
Filter
modulation
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