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The degree of frequency change controls how many of harmonics will
emerge. The quantity of the frequency change of the carrier is
controlled by the amplitude change of the modulator waveform. In
Yamaha FM synthesizer the amount of FM depth is set by the
modulator output level.
To a certain degree we may compare the FM modulator output level
with the frequency setting of a flter in subtractive synthesis.
complex FM, FM with more than two operators
In the Yamaha FM synthesizers we can distinguish three diferent
instruments according to the number of operators that may be used.
-operator synths like
4
-Operator instruments like
6
There are also a few
the
. In these multiple operator instruments there are several ways
FS1R
to combine the operators.
various combinations of operators
It is now possible, for example, that the carrier wave is modulated by
two or more operators that serve as a modulator. These diferent ways
of linking together, can be seen as an imprint on the
These are numbered confgurations of rectangular blocks. The bottom
blocks represent the carriers, the modulators are indicated by the
blocks above. There is always a connection represented by a line. From
top to bottom between the blocks standing one above the other. This
symbolizes the connection between the output of the modulator and
the frequency control input of the carrier. The lower horizontal line
represents de mixing of the carriers.
Under each block diagram one can fnd a number that indicates the
appropriate confguration. The block diagrams must be read from top
to bottom, an analogy with the diagrammatic representations in the
world of computer music.
algorithms, confgurations of multiple operators
The various modes of linking multiple operators are called in Yamaha
jargon,
. In
algorithm
simple FM which are mixed. It will be clear that through the use of
more than two operators synthesis possibilities signifcantly increase.
FM Synthesis I, global and simple, © Ernst Bonis 1985/1993/2013
FB01, TX81Z, DX11, DX100
DX7/DX7II/TX7/TX802, SY77/99
-operator instruments like the
8
and
on the
Algorithm 5
6
and
.
V50
and
HX1 electone
synthesizer.
DX7
we fnd three pairs
DX7
.
TG77
and
4
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