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3.
Function of
the
SH-3
VCO
a)
Keyboard
The
keyboard
employs
F
scale,
44
keys
and
3
1
/2
octaves.
It
is
possible,
however,
to
raise
or lower notes
by one
octave
via
the
Transpose
changeover
switch
to
actually
extend
the
keyboard function
to
68
keys
(9
1
/2
octaves
are possible
by
adjusting the
VCO).
Due
to
the
employed
"low-tone-take-
precedence"
system,
when
two
or
more
keys
are
depressed
simultaneously,
the
lowest
tone
only
is
produced.
When
a
key
is
depressed,
a voltage
which
identifies
the
tone
of
the
key
is
supplied to the
VCO
and
at
the
same
time,
another
fixed
voltage
is
supplied to the
ADSR
to
form
an
envelope.
b)
VCO
(Voltage Controlled
Oscillator)
The
VCO
of
the
SH-3
comprises
volume
knobs and
change-over switches
as
shown
in
Fig.
3.
ITJ
Symmetric
Rectangular
Wave
.
.
.
Contains
odd
harmonics
(3, 5, 7,
9
.
.
.)
to
produce.
clarinet-like
sounds.
Unsymmetrical
Rectangular
Wave
....
Contains
many
high-tone
harmonics.
Pulse
Wave
.
.
.
Contains
many
high-tone
harmonics
to
produce
string
sounds
like a violin.
Each foot-volume knob
(32'
to
2')
is
equipped
with an
output-wave-form
selector
to
produce
compound
wave forms without
limitation.
Turning
the
8'
CHORUS
dial
clockwise
quickens the beat of
chorus.
n_i
A_
Fig.
3
a
L
1
—
—
—
—
r
m
=E
I-
-I
32'
16'
8'
4'
2'
<>
-
|
10
8
—
4
m m
a
BS|
Eg B
I
m
phi
B
:
m E
Ba
eb
IbbI
Voltage
Controlled
Oscillator
J
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