7.
Tone Color
Parameters
A tone color
consists of
various parameters,
there-
fore, to
edit
a
tone
color, change the
values of
those
parameters.
a.
Synthesizer
Structure
The a JUNO's
synthesizer section
consists of
several
blocks as shown in
the picture.
Each
block of the
synthesizer section is controlled by
relevant
tone-color parameters.
»
Audio Signal
Control
Signal
®
DCO
Block
HPF
Block
®
VCF
Block
®
VGA Block
®
Chorus
Block
.
I
, 1 .
.
1
. L 1 .
1 ,
®
LFO
Block
.
®
ENV
Block
L, J
w
'
]
Modu
Lever
lation
P
B
tch
ender
Ke
Y
iybo
ard
Output
(D
DCO
(Digitally
Controlled Oscillator)
DCO
is the
digitally controlled oscillator
that con-
trols
the pitch and
generates
the waveforms that
are
the sound source
of the
synthesizer.
(D
HPF (High Pass
Filter)
The
HPF (High-Pass
Filter) is
a
filter that passes
high
frequency harmonics and
cuts off the
lower
ones. This
changes the
waveform and controls
the
tone color.
(3)
VCF (Voltage
Controlled Filter)
Each VCF lets
lower
frequency harmonics
of
the
input signal pass and
cuts off the higher ones.
In
other
words, it is a usual
low
pass
filter. By con-
trolling the
cutoff point and resonance, the
waveform changes, thereby the tone color
alters.
®
VCA (Voltage
Controlled
Amplifier)
After
filtered in
the
VCF, the
signal is fed to the
VCA
where the volume
(amplitude) of the
sound Is
controlled.
(5)
CHORUS
®
LFO
(Low
Frequency
Oscillator)
This oscillator generates
extremely low
frequency,
so
produces
a
vibrato or growl effect by
control-
ling
the DCO or
VCF.
®
ENV
(Envelope
Generator)
This
generates the control
voltage (Envelope)
which controls the DCO, VCF and
VCA, therefore,
alters the pitch, tone
color and volume in each
note.
18
To Next Page
Loading...
