Yamaha CS-80 Instruction Manual page 36

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m
32
VCO
(Voit^g^ Controlled
Oscillator}
[20]
SPEED
- Adju^u
the
rate
of pulse
width modula-
tion
t>f
the
Square wave, provided the
PWM
lever
is
mo^ed away
from
it^
"0"
position.
[21
]
PWM
-
Adjusts the
depth
of Pulse
Width Modu-
lation ithe di^vi^tion
in
square
wave-
duty
cyd&).
A
"0"
setting
yields;
no
modulation.
(22
J
PW
Sets
the
basic
duty
cycle of the
square
wav« from
a
symmetrical
wa^e
(50%)
to
a
narrow
puke
(90%}.
[23]
SQUARE
WAVE
-
Turns
OM
the
square
wave
generating
circuits
when
ihe
switch
is
rocked forward
[24]
SAWTOOTH WAVE
-
Turns
ON
the
sawtooth
v^ve
generating
circuits
when
the switch
is
rocked
fo/ward.
[25]
NOISE
-
Jmroduces
white
noise into the
VCO
output
as
the
slider
is
n^oved
up (-10
is
maximunri
noise),
NOTE:
The
numbers above
the notation to
the
ri^ht
indicate
the
overtone number.
All
notes (except pure
sine
wave
notes)
have overtones
which
are
not heard
separately,
but which
give
the
note
its
tonal ch^r^cter.
The
first
overtone
is
the
second harmonic
of
the
fundamental
(i.e.,
twice
its
frequency),
etc.
To
he^r
the
individuaJ
overtone,
set
RESh
[27]
,
RESl
[2Q]
and
RESOMANCE
[S]
at
maximum,
and
gradually
move LPF
[28]
down.
"^^^.
nu
Slow
PLi^#
Width
It^ddul^ti^ri
J**%
505&
&0%
50%
9Qf%
50%
"LrLnLrr-LrLTLRj—Lr
'mirmj
Fast Pulse Widftr McMJulati
on
11
13
15
lilJiBI
m
jH
11
y
y
ii
iLn-i^^
DcMOvib-i
H^.
>*<....
90%
Square
W3v*> Pulse
Widlh
iilBiiiP
11
13
15
L^n^
^
L
lOdd-l>di!
hPM-rrvofi.Ek
Onlyi
50^
Square
UV^ve Pulse
iiVidtN
4
5
e
7
S 9.
10
11
12 13
14
15
t*
f
^
iiilB
r-ynd/imMiMl
lOrtd
£
L^>*p.
^rur
hj.
i«qri^i,-
WEE'E
*MOTE:
The
fLindamenla!
{C[
is
Th^ note pFaved.
and
the ^m^ll^r
Hioiation to
the
Krcjhi
suggi^st
the harmoitics
(ovftTiEjiiesh
oi
that note,
all
of
which
are
simuhaneoM^ly
tf^nyrijied
hy
the
VCO.
Noise

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