Yamaha DX9 Operating Manual page 12

Examples
of
output waveforms
• Modulator and
carrier
combinations
•
Carrier
and
carrier
combinations
Frequency
ratio
of
modulator
to carrier equals
1
:1
Frequency
ratio
+1
-!
Carrier
1
1
Carrier
2
-1
-
Frequency of
modulator
to
carrier
equals
2:1
+1 -
Carrier
1
Carrier
2
Frequency
of modulator
to
carrier
equals
3:1
+1 -
Carrier
1
Carrier
2
Output
wave form
Output
wave form
^
Output
wave form
3.
Algorithms
....
Combining
Several
Operators
The
DX9
has
a total
of
four operators.
The way
in
which
these operators
are
combined
is
known
as
an "algorithm."
The
DX9
has
8
different
pre-programmed
algorithms.
The
8 algorithms
are
displayed graphically
on the control
panel.
Taking
algorithm
number
5
as
an example, the lowest
two
operators—
1
and
3—
are carriers.
The two
operators
above
the
carriers will
function as
modulators.
The
output of
operator
4
is
fed
back (feedback) to
its
input.
The
above
is
a brief
decription of the internal
workings
of
the
FM
tone generator system.
By
varying the pitch
fre-
quency, modulation and envelope
data
it is
possible to
edit
pre-programmed
voices
or
to
create entirely
new
voices.
5^
Algorithm 5
^J
[T
m
3
Divided
in
two
sections
Modulates
<M>