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The
Envelope, comprises elements Attack
(A),
Decay(D),
Sustain(S)
and
Release(R),
as
shown
in
Figure
1
in
general
form, can be
varied
according
to
operation
control.
Two
basic
kinds
of
envelopes can be
produced,
namely
AR
and
ADSR.
The
ADSR
and
AR
are
also
called
Envelope
Generators.
Fig.
2
shows
the
mutual
relation
among VCO, VCF, VCA, LFO,
SAMPLER,
and
ADSR.
This
is
the general theory of
Synthesizer operation.
Of
course, besides the
abovementioned,
there
is
other function
—
namely,
white-noise generator. Synthesizing
these
functions
in
many
ways
creates
even
more
complicated and
more
unique
sounds.
Fig.1
Fig.
2
-^
(Time)
LFO
"
"
SAMPLER
VIBRATO
GROWL
TREMOLO
'
"
V
KEYBOARD
-»
VCO
—
»
VCF
—»
VCA
n
i
OUT
Voltage
Signal
A
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