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additive algorithm
An example of an additive algorithm can be found in
on
algorithm 32
the
.
DX7
In this confguration we see all six operators coexist. Their outputs are
simply added together (mixed). In this example, we basically obtain
the additive synthesis model. Additive means literally add, mixing. All
operators now function as carriers. Modulators are missing here
completely.
operators with complex waveforms
Some FM synthesizers have besides the pure sine tone per operator
also other vibration modes, complex waveforms: instruments like
and
. In the
TX81Z, DX11, V50, SY99, SY77,TG77
FS1R
SY77/99/TG77
instruments for each operator we may choose a sine wave and
15
additional complex waveforms. The previously mentioned
-operator
4
instruments
etc. provide a sine wave operator and
complex
TX81Z
7
waveforms.
feedback
In the diagrams of algorithms we see always one operator from wich
it's output is connected back to it's modulation input.
(see for instance
. This is called self modulation or feedback. The
alg. 32, operator 6)
output signal itself is now applied as a modulation source. At a certain
level this provides an output waveform which is virtually identical to
the traditional sawtooth vibration.
multiple feedback
In some FM instruments there can be several of these feedback
connections active. In
synthesizers a maximum of
of
SY77/TG77 SY99
3
FM Synthesis I, global and simple, © Ernst Bonis 1985/1993/2013
5
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