Filter
Top Products
142
EDITING, REPAIRING, AND SYNTHESIZING AUDIO CHP. 9
Generating audio with frequency modulation
Sound Forge’s FM Synthesis feature can be used to create complex sounds from simple waveforms using
frequency modulation (FM).
In frequency modulation, the frequency of a waveform (carrier) is modulated by the output of another
waveform (modulator) to create a new waveform. If the frequency of the modulator is low, the carrier is
detuned slowly over time. If the frequency of the modulator is high, the carrier is modulated so quickly that
numerous additional frequencies (or sidebands) will be created.
Using the
FM Synthesis tool, up to four waveforms (operators) can be used in a variety of configurations.
Depending on the configuration, a waveform can be a carrier, a modulator, or a simple, unmodulated
waveform.
Generating a waveform
1.
From the Tools menu, choose Synthesis, and choose FM from the submenu. The FM Synthesis dialog
appears.
2.
Specify the length (in seconds) of the generated waveform in the Total output waveform length box.
3.
Use the Configuration slider to configure the arrangement and number of operators used to generate the
waveform. For more information, see Specifying the number and arrangement of operators on page 143.
4.
Modify individual operators as needed. For more information, see Modifying an operator on page 143.
5.
From the Insert waveform at drop-down list, choose a position to determine where the generated waveform
is placed in the file.
6.
Click OK.
FM Synthesis dialog