2009

Table Of Contents
Resynthesis
You can analyze the frequency components of a recorded sound and then resynthesize
(reconstruct) a representation of the sound using additive techniques. By calculating the
frequency and amplitude of each harmonic in the overall frequency spectrum of the
sound, an additive resynthesis system can generate a series of sine waves (with appropriate
levels over time) for each harmonic.
After the sound has been resynthesized in this fashion, you can adjust the frequency and
amplitude of any harmonic. Theoretically, you could restructure a harmonic sound to
make it inharmonic, for example.
Phase Distortion Synthesis
Phase distortion synthesis creates different waveforms by modifying the phase angle of
a sine wave.
In essence, you can bend a sine wave until it becomes a sawtooth wave, a triangle wave,
a square wave, and so on. The synthesizer engine beyond the waveform generation in
general follows the standard subtractive method.
Phase distortion synthesis was commercially introduced in 1984’s Casio CZ series
synthesizers.
Granular Synthesis
The basic premise behind granular synthesis is that a sound can be broken down into
tiny particles, or grains. These sampled grains—usually no more than 10 to 50 ms
long—can then be reorganized, or combined with grains from other sounds, to create
new timbres.
In many respects, this is much like wavetable synthesis, but it works on a much finer scale.
As you might expect, this method is ideal for creating constantly evolving sounds and
truly unique tones.
The downside is that granular synthesis is extremely processor-intensive, and it wasn’t
possible to do it in real time until relatively recently. For this reason, it has remained
largely ignored by all but a few in academic institutions. Todays computers, however,
have sufficient processing power to make this synthesis method a practicality, and there
are a number of commercial products now available.
A Brief History of the Synthesizer
This overview showcases a few of the most significant developments in synthesizer history.
555Appendix Synthesizer Basics